HUYU HUW1 Series Owner's manual

HUW1 Series
Intelligent Universal Circuit Breaker
Installation and
Operation Instruction
Please read the instruction carefully before
installing and using the product
and keep it for future reference.
HUANYU HIGH-TECH
CO., LTD.

Attention:
After you receive the ordered products, please check according to the following terms:
1) Check whether the appearance, such as the housing, is damaged;
2) Check whether the attached accessories are complete according to the inventory of
packing materials in Table 1;
3) Check whether the parameters on the label of the circuit breaker are consistent with the
goods ordered.
Table 1 Inventory of packing materials
Name
Unit
Quantity
Notes
Circuit breaker
Set
1
Standard
HUW1 Series Intelligent Universal Circuit
Breaker Instruction
Copy
1
Standard
Door frame+O-ring
Set
1
Standard
Phase spacer plate
Set
1
Standard
Screw
Bag
1
Standard (configured based on product
specifications)
Desiccant
Bag
1
Standard
ST power module
Piece
1
Optional (only available when ordered)
ST201 relay module
Piece
1
Optional (only available when ordered)
Mechanical interlock
Set
1
Optional (only available when ordered)
Dual power controller
Set
1
Optional (only available when ordered)
ST-DP protocol conversion module
Piece
1
Optional (only available when ordered)
External transformer
Piece
1
Optional (only available when ordered)
The company pledges:
On the premise that users abide by the use and storage conditions and that the product seals
are intact, if the product is damaged or cannot be used normally due to manufacturing quality
problems within 18 months from the production date of the product, the company will be
responsible for the repairing or replacement free of charge. If the warranty period expires, the
users shall pay for the repair. However, if the damage is caused by the following circumstances,
the fees for repair still shall be charged even within the warranty period:
(1) Misuse, self-modification, improper maintenance, and other reasons;
(2) Use beyond the standard specification requirements;
(3) Falling, damage during transportation, or other causes after purchase;
(4) Earthquake, fire, lightning stroke, abnormal voltage, other natural disasters and
secondary disasters, etc.
In case of any questions, please contact the dealer or our customer service department.
Dear customers:
To protect our environment, please recyclethe product or its components when the product is
scrapped. For materials that cannot be recycled, please handle them properly. Thank you very
much for your cooperation and support.

HUW1
Series Intelligent Universal Circuit Breaker
1
1Scope of Application
The HUW1 Series Intelligent Universal Circuit Breaker (hereinafter referred to as “circuit breaker”) is suitable for
distribution networks with AC 50 Hz, rated working voltage of 690 V and rated current up to 6,300 A, and is mainly
used for power distribution, power feeding and power generation protection, so as to protect circuits and power
equipment from faults such as overload, undervoltage, overvoltage, current voltage imbalance, short circuit and
grounding fault. The rational operation of the power grid can be realized through load monitoring, regional interlock
and other functions. Furthermore, the circuit breaker can also be used to measure power grid parameters such as
current, voltage, power, frequency, electrical energy, demand and harmonics. It can also be directly used for overload,
undervoltage and short-circuit protection of motors and generators.
The core component of circuit breakers adopt intelligent controllers, which can realize accurate selective
protection, so as to avoid unnecessary blackout and enhance the reliability, continuity and safety of power supply.
These components can also be equipped with open communication interfaces to realize telemetering, telesignaling,
telecontrol and teleregulation, thus meeting the requirements of the control center and the automation system.
The circuit breaker series can be used as isolators without intelligent controllers and transformers.
The circuit breaker series can be compatible with top-in or bottom-in incoming lines, which is suitable for various
low-voltage power distribution fields such as power stations, factories and intelligent buildings, and can also be used
for infrequent starting of motors.
The derivative products of this series of circuit breakers, HUW1PVA and HUW1F, have passed the
ultra-high/-low temperature environment test and the "three prevention" related test, and are suitable for photovoltaic
and wind power generation systems with AC 50 Hz, rated voltage up to 690 V and rated current up to 3,200 A. They
are mainly used for power distribution, power feeding and power generation protection, so as to protect the lines and
power supply equipment from faults such as overload, undervoltage, overvoltage, current voltage imbalance, short
circuit and grounding fault.
The product complies with GB/T 14048.2 Low-voltage Switchgear and Controlgear — Part 2: Circuit Breakers.
2Product Model Description and Classification
2.1 Product model description
2.2Classification
2.2.1 According to the installation mode
Fixed, drawer.
2.2.2 According to the number of poles
Three-pole, four-pole.
2.2.3 According to the operation mode
Electrical operation, manual operation (for overhaul and maintenance).
2.2.4 Release type
Intelligent controller, undervoltage instantaneous (or delay) release and shunt strip.
2.2.5 According to the intelligent controller
Type L (DIP), Type M (digital) and Type H (liquid crystal).
2.2.6 According to the wiring mode
Horizontal wiring, vertical wiring.
3Normal Working, Installation and Transportation Conditions
3.1 Normal working conditions
a) The ambient air temperature shall be -5°C to +40°C (-40°C to +70°C for HUW1F and HUW1PVA); and the
average temperature within 24 hours shall not exceed +35°C.
Note: If the upper limit exceeds +40°C or that the lower limit is lower than -5°C, the user shall consult with the
manufacturer.
b) The altitude of the installation location shall not exceed 2,000 meters.
Note: If the circuit breaker is used at an altitude above 2,000 meters, the user shall consult with the
manufacturer.
c) The relative atmospheric humidity does not exceed 50% when the ambient air temperature is +40°C, and a
higher relative humidity is allowed at a lower temperature. For example, when the average maximum relative
Derived
model
Shell frame
level
Type
Number
of poles
Rated
current
Rated
voltage
Mounting
type
Drawer
Fixed
Huanyu Group Zhejiang
Hi-tech Co., Ltd.
Universal circuit
breaker
Design
number
Accessories
PVA: Special for
photovoltaic
F: Special for wind
power
N/A
With
undervoltage
N/A

HUW1
Series Intelligent Universal Circuit Breaker
2
humidity in the wettest month is 90%, the average minimum temperature in this month is +20°C. Measures shall be
taken to deal with the occasional condensation due to temperature changes.
d) The contamination grade is Grade 3.
e) The installation category of the main circuit of the circuit breaker is IV. When the rated working voltage of the
main circuit is not greater than AC 400 V, the installation categories of the control circuit and the auxiliary circuit are III
except that the undervoltage release coil and the primary coil of the power transformer of the intelligent controller are
the same as the circuit breaker. When the rated working voltage of the main circuit is AC 400 V to AC 690 V, the
control circuit and the auxiliary circuit need to be isolated from the main circuit by the transformer; the highest working
voltage of the control circuit and the auxiliary circuit is AC 400 V; and the installation categories of the control circuit
and the auxiliary circuit are both III.
f)The circuit breaker is suitable for electromagnetic environment A.
3.2 Normal installation conditions
a) Installation of the circuit breaker: Place the circuit breaker in the distribution cabinet and fasten it with four M8
(1,000 A shell frame) or M10 (2,000 A above shell frame) bolts and gaskets. The circuit breaker shall be installed
smoothly without additional mechanical stress, so as to avoid damage to the circuit breaker or poor contact of the
main busbar.
b) The circuit breaker shall be installed in places where there is no explosion hazard, conductive dust, metal
corrosion, or insulation damage.
c) The protection level is IP20. When the circuit breaker is installed in the cabinet and the door frame is installed,
the protection level can reach IP40.
3.3 Normal storage and transportation conditions
a) The lower temperature limit shall not be less than -25°C, and the upper temperature limit shall not be more
than +55°C (while for HUW1F and HUW1PVA, the lower temperature limit shall not be less than -50°C, and the upper
temperature limit shall not be more than +85°C). The relative humidity (at 25°C) shall not exceed 95%.
b) The product shall be handled with care during transportation, and shall not be turned upside down and rolled
to avoid violent collision.
4Product Structure and Working State
4.1 Product structure
Drawer seat
Face shield
Reset button
Intelligent controller
Opening button
Switching indicator
Left handle
Crank operating hole
Two-position indicator
Crank
Safety baffle
Left guide rail
Secondary
connector
(Drawer)
Adjusting frame
Right guide rail
Arc-extinguishing chamber
Secondary connector
Auxiliary switch
Shunt strip
Closed electromagnet
Electric operating mechanism
Operating mechanism
Secondary connector
Key lock position
Energy storage handle
Close button
Energy storage indication
Label
Right handle
Padlock clamp plate
Three-position lock
Drawer Mode Circuit Breaker
(Example: 2,000)
Drawer Seat
(Example: 2,000)
Body Removal Face Shield
(Example: 2,000)

HUW1
Series Intelligent Universal Circuit Breaker
3
4.2 Working state of the circuit breaker
4.2.1 Working state of the intelligent controller
Normal condition of the
intelligent controller
When the intelligent controller is in the protection state, the
circuit breaker is open. After clearing the line fault, press this
button to close the circuit breaker.
4.2.2 Working state of the operating mechanism
Circuit breaker
being open
without stored
energy
Circuit breaker
being open with
stored energy
Circuit breaker being
closed without stored
energy
Circuit breaker
being closed with
stored energy
4.2.3 Working state of the drawer seat (only available for the drawer mode circuit breaker)
Reset
Reset
Release
energy
Store
energy
Release
energy
Store
energy
Three-position lock of the drawer seat
Lock the main body of the circuit breaker in three positions, namely
"Disconnection", "Test" and "Connection" of the drawer seat.
Three-position indicator of the
drawer seat
Indicate the main body of the circuit
breaker in three positions, namely
"Disconnection", "Test" and
"Connection" of the drawer seat.
In the three positions of "Disconnection",
"Test" and "Connection", the position lock is
locked and the crank cannot be operated (in
the unlocked state)
After the position lock is locked, press the
position lock button to unlock (in the locked
state) if the user needs to operate the crack
again.
In the "Disconnection" position,
both the main circuit and the
secondary circuit are
disconnected
In the "Test" position, the main
circuit is disconnected and the
secondary circuit is connected
In the "Connection" position,
both the main circuit and the
secondary circuit are
connected

HUW1
Series Intelligent Universal Circuit Breaker
4
5Technical Parameters and Performance of the Circuit Breaker
5.1 Technical parameters and performance
Type and shell frame current
Inm
HUW1-1000
HUW1-2000
HUW1F-2000
HUW1PVA-2000
HUW1-3200
HUW1F-3200
HUW1PVA-3200
HUW1-4000
HUW1-6300
Rated current In(A)
200, 400, 630,
800, 1,000
630, 800, 1,000,
1,250, 1,600,
2,000
2,000, 2,500,
2,900, 3,200
2,500, 2,900,
3,200, 4,000
4,000, 5,000,
6,300
Neutral rated current IN(A)
100%In
100%In
100%In
100%In
50%In
Rated working voltage Ue(V)
AC 400/690
Frequency
50 Hz
Number of poles
3P/4P
Rated impulse withstand
voltage Uimp (kV)
AC 12
Rated insulation voltage Ui(V)
AC 1,000
Power frequency withstand
voltage (V)
AC 3,500
Rated ultimate
short-circuit
breaking
capacity Icu (kA)
AC 400 V
42
85
100
100
120
AC 690 V
20
50
65
70
85
Rated operating
short-circuit
breaking
capacity Ics (kA)
AC 400 V
30
65
65
100
100
AC 690 V
15
50
50
70
75
Rated
short-time
withstand
capacity Icw/
1s(kA)
AC 400 V
30
65
65
100
100
AC 690 V
15
50
65
70
85
Use category
B
Full breaking time (without
additional delay)
≤30 ms
Closing time
≤70ms
Electrical life
(times)
≤2,500 1 time/
3 min
>2,500 1 time/
6 min
400V
15,000
8,000
6,000
5,000
3,500
690V
6,000
6,000
5,000
3,500
2,000
Mechanical life
(times)
≤2,500 1 time/
3 min
>2,500 1 time/
6 min
Maintenance
free
20,000
20,000
15,000
12,500
10,000
With
maintenance
30,000
30,000
25,000
20,000
20,000
Mechanical life of drawer seat
(times)
1 time/2 min
1,000
1,000
1,000
600
300
Incoming mode
Top-in or bottom-in
Flashover distance (mm)
0
Mounting mode
Fixed or drawer
Drawer
Wiring method
Horizontal or vertical
Horizontal
Note: The mechanical life “1 Time” of drawer seatmeans that the circuit breakerbody is moved from "Disconnection" to
"Connection" and then to "Disconnection" position through cranking in the drawer seat.

HUW1
Series Intelligent Universal Circuit Breaker
5
5.2 Power consumption
Shell frame
current (A)
Rated current
(A)
Power consumption (W)
3P, drawer mode
4P, drawer mode
3P, fixed mode
4P, fixed mode
1,000
200
8
11
4
6
400
35
47
18
24
630
81
104
45
60
800
96
128
48
64
1,000
144
192
85
114
2,000
630
42
56
24
32
800
67
90
38
51
1,000
75
100
45
60
1,250
117
156
70
94
1,600
192
256
115
154
2,000
276
368
156
208
3,200
2,000
276
368
156
208
2,500
375
500
188
250
2,900
454
606
252
336
3,200
553
737
307
410
4,000
2,500
400
550
268
350
2,900
510
680
275
380
3,200
598
790
300
400
4,000
660
880
332
450
6,300
4,000
576
768
-
-
5,000
900
1,200
-
-
6,300
1,429
1,905
-
-
Note: The power consumption of the circuit breaker refers to the power consumption of the main circuit measured by the
rated current of the circuit breaker at normal temperature, excluding the power of other accessories with the power
consumption of the circuit breaker. The data in this table is for users' selection reference only, and cannot be seen as the
circuit breaker’s actual power consumption when in use.
5.3 Altitude and derating factor
Altitude (m)
2,000
3,000
4,000
5,000
Derating
factor
of related
items
Working current Ie
1
0.93
0.88
0.82
Short-circuit breaking capacity Icu, Ics
1
0.83
0.71
0.63
Short-circuit withstand capacity Icw
1
0.83
0.71
0.63
Rated impulse withstand voltage Uimp
1
0.9
0.71
0.63
Power frequency withstand voltage
1
0.9
0.71
0.63
Rated insulation voltage Ui
1
0.83
0.71
0.63

HUW1
Series Intelligent Universal Circuit Breaker
6
5.4 Look-up table of the working current derating with the ambient temperature change
Shell frame
level (A)
Rated current
(A)
Working current after derating (A)
+40°C
+50°C
+60°C
+70°C
1,000
200
200
200
200
200
400
400
400
400
400
630
630
630
630
630
800
800
800
800
800
1000
1000
850
850
800
2,000
630
630
630
630
630
800
800
800
800
800
1,000
1,000
1,000
1,000
1,000
1,250
1,250
1,250
1,250
1,250
1,600
1,600
1,600
1,600
1,600
2,000
2,000
1,700
1,700
1,600
3200
2,000
2,000
2,000
2,000
2,000
2,500
2,500
2,400
2,300
2,200
2,900
2,900
2,900
2,900
2,900
3,200
3,200
3,000
3,000
2,900
4,000
2,500
2,500
2,500
2,500
2,500
2,900
2,900
2,900
2,900
2,900
3,200
3,200
3,200
3,200
3,200
4,000
4,000
3,800
3,600
3,600
6,300
4,000
4,000
4,000
4,000
4,000
5,000
5,000
5,000
4,500
4,500
6,300
6,300
5,500
5,500
5,000
5.5 Recommended look-up table corresponding to the cross-sectional area of the external copper
busbar and the rated current of the circuit breaker
Rated current
(A)
Specification of external
copper busbar
width×thickness (mm)
Number of wires per
terminal (piece)
Cross-sectional area per
terminal (mm2)
200
20×5
1
100
400
40×5
1
200
630
40×5
2
400
800
50×5
2
500
1,000
60×5
2
600
1,250
80×5
2
800
1,600
100×5
2
1,000
2,000
100×5
3
1,500
2,500
100×5
4
2,000
2,900
100×10
3
3,000

HUW1
Series Intelligent Universal Circuit Breaker
7
Continued
Rated current (A)
Specification of external copper busbar
width×thickness (mm)
Number of wires per
terminal (piece)
Cross-sectional area per
terminal (mm2)
3,200
100×10
4
4,000
3,600
100×10
5
5,000
4,000
100×10
5
5,000
5,000
100×10
6
6,000
6,300
100×10
8
8,000
Note: The material of the external copper busbar in this table is T2 bare copper. The specifications of the external copper
busbar can be changed according to the actual usage, but it shall meet the cross-sectional area requirements of different
currents in the table. Also, the sum of the contacting areas between copper busbars shall not be less than the
cross-sectional area so as to ensure good contact.
6Protection Characteristics of the Intelligent Controller
6.1 Type and interface description of 1,000 A shell frame intelligent controller
Type L4 (DIP) Type 2M (digital display) Type 3H (liquid crystal)
6.1.1 Interface symbols, indicator lights and key descriptions of 1,000 A shell frame L3/L4 (DIP)
intelligent controller
Serial
number
Symbol/Name
Definition
1
Reset button
After the release is interrupted due to the circuit breaker fault, it is required to press
this button before the circuit breaker can be closed again.
2
In
Circuit breaker rated current
3
“40–100” indicator light
This group of lights is a load current indicator, which shows the percentage of the
load current to the setting current (Ir1). If the percentage exceeds 100%, the
overload light will be on.
4
"Ig, Ii, Isd, IR" fault
indicator light
When there is a ground fault, the Ig light is on; when there is an overload fault, the IR
light is on; and when there is ashort-circuit fault, the Isd light is on for the short-delay
action of the circuit breaker and the Ii light is on for the instantaneous action.
5
Time setting value
comparison table
Comparison table of action delay time values of grounding protection, short-circuit
short time delay protection and overload long time delay protection.
6
Current setting value
comparison table
Comparison table of current multiples of grounding protection, short-circuit
instantaneous protection, short-circuit short time delay protection and overload long
time delay protection.

HUW1
Series Intelligent Universal Circuit Breaker
8
Continued
Serial
number
Symbol/Name
Definition
7
“tR” DIP switch
Setting of the delay time value corresponding to the overload long time delay
protection action
8
“IR” DIP switch
Setting of the overload long time delay protection current multiple
9
“Isd” DIP switch
Setting of the short-circuit short time delay protection current multiple
10
“Ii” DIP switch
Setting of the short-circuit instantaneous protection current multiple
11
“Ig” DIP switch
Setting of the grounding protection current multiple
12
“tg” DIP switch
Setting of the delay time value corresponding to the grounding protection
action
13
"MCU" indicator light
During normal operation, the MCU light is normally on, and goes out during
self-diagnosis and power failures.
14
"Fault Check" key
Press this button to display the previous line fault protection section of the
system memory.
15
"Test" key
During normal operation, press the test button, and the controller will send out
instantaneous trip signals to test the action performance of the circuit breaker
16
"Clear Light" key
After the test trip, phase current selection, fault check and fault trip, press the
clear light key to restore the controller to a normal working state.
17
“tsd” DIP switch
Setting of the delay time value corresponding to the short-circuit short time
delay protection action
6.1.2 Interface symbols, indicator lights and key descriptions of 1,000 A shell frame 2M (digital)
intelligent controller
Serial
number
Symbol/Name
Definition
1
Reset button
After the release is interrupted due to the circuit breaker fault, it is required to press
this button before the circuit breaker can be closed again
2
In
Circuit breaker rated current
3
L1, L2, L3, N indicators
During normal operation, L1, L2, L3and N-phase (i.e. A, B, C and N-phase) current
indicators flash cyclically
4
Digital display window
Parameters such as current, voltage, frequency, setting and fault are displayed in
the window
5
Indicator lights of
corresponding
parameters
Ic1 indicates load monitoring 1 protection; Ic2 indicates load monitoring 2 protection;
δ indicates current imbalance protection; Ifindicates grounding protection; L
indicates long time delay protection; S indicates short time delay protection; I
indicates instantaneous protection; T indicates the self-diagnosis fault status
indication; ×10/1 indicates the number of circuit breaker actions; % indicates the
contact wear percentage; A/kA indicates ampere/kiloampere (current); S indicates
second (time)
6
“Enter” key
Press “Enter”to enter the functional state or save the changed data
7
▼ key
Press ▼ to select function items or reduce parameter values
8
"Setting" indicator light
When the "Setting" light is always on, you can view or modify the setting values of
various protection characteristic parameters
9
"Inquiry" indicator light
When the "Inquiry" light is always on, you can view the fault history
10
"Alarm" indicator light
When the "Alarm" light is always on, it indicates being in the process of fault delay
11
“Fault” indicator light
When the "Fault" light is always on, it indicates the fault category, and circularly
displays the fault current and duration
12
▲ key
Press ▲ to select function items or increase parameter values
13
“Back” key
Press “Back”to return to the previous operation
14
“Test” indicator light
When the "Test" light is always on, the trip test can be carried out
15
"Save" indicator light
When the "Save" light flashes, it indicates a data change

HUW1
Series Intelligent Universal Circuit Breaker
9
6.1.3 Interface symbols, indicator lights and key descriptions of 1,000 A shell frame 3H (liquid crystal)
intelligent controller
Serial number
Symbol/Name
Definition
1
"Reset" button
After the release is interrupted due to the circuit breaker fault, it is required to press this
button before the circuit breaker can be closed again
2
In
Circuit breaker rated current
3
Liquid crystal display (LCD)
Display all measurement parameters, system setting parameters, protection setting
parameters and all information in Chinese
4
Overload and short-circuit
protection area
When the current protection is set, the indicator light of this area is always on, indicating
that the protection current value or delay time value of the corresponding area is being set;
5
Grounding protection area
In case of fault or alarm, the indicator light of this area flashes, indicating that the
corresponding area is in fault protection or alarm;
6
"System Settings" key
Quickly switch to the "System Settings" main menu ("Right Arrow" when adjusting the
system clock)
7
"Running Parameters" key
Quickly switch to the "Running Parameters" main menu ("Left Arrow" when adjusting the
system clock)
8
"Up Arrow" key
Move the cursor up, change the selected parameter up, or position the display to the left
9
"Down Arrow" key
Move the cursor down, change the selected parameter down, or position the display to the
right
10
"Exit" key
Exit the current menu to enter the previous menu, or cancel themodification of the current
parameters
11
"Reset" key
Reset to enter the initial working state in a fault trip or an alarm state
12
"Fault/Alarm" indicator light
During normal operation, thefault oralarm indicator light is not on;When the "Fault/Alarm"
indicator light flashes, there must be a fault in the system.
13
"Normal" indicator light
When the controller is powered on, the "Normal" indicator light shall always flash. If the
light does not turn on after power-on, the controller is not working properly and shall be
replaced immediately.
14
“Communication” indicator light
The communication indicator light is on, indicating thatcommunication data is transmitted;
the light goes off when there is no communication data transmission.
15
"Protection Settings" key
Quickly switch to the "Protection Settings" main menu
16
"Information Inquiry" key
Quickly switch to the "Information Inquiry" main menu
17
"Enter" key
Enter the next menu of the item pointed by the current cursor, select the current
parameter, or save the modification
18
Test interface
It includes the following functions: DC 24 V power input port; analog signal input port;
programming and communication interface
6.2 Type and interface description of 2,000 A (and above) shell frame intelligent controller
Type L4 (DIP) Type 2M (digital display) Type 3H (liquid crystal)
Reset
Intelligent controller L4
Reset
Intelligent controller 2M
Reset
Intelligent controller 3H

HUW1
Series Intelligent Universal Circuit Breaker
10
6.2.1 Interface symbols, indicator lights and key descriptions of 2,000 A (and above) shell frame L3/L4
(DIP) intelligent controller
Serial
number
Symbol/Name
Definition
1
Reset button
After the release is interrupted due tothe circuit breaker fault, it is requiredto press this button before
the circuit breaker can be closed again
2
In
Circuit breaker rated current
3
“40–100” indicator light
This group of lights is a load current indicator, which shows the percentage of the load current to the
setting current (Ir1). If the percentage exceeds 100%, the overload light will be on.
4
“Ir4, Ir1, Ir2, Ir3” DIP switch
Setting of the asymmetric grounding (neutral connection) fault, overload long time delay,
short-circuit short time delay, and short-circuit instantaneous rated current multiples respectively
5
"Fault Display" area indicator
light
Indicate the fault category (corresponding to indicator light is on): Ir4 indicates grounding fault, Ir1
indicates long time delay fault, Ir2 indicates short time delay fault, Ir3 indicates instantaneous short
circuit fault
6
"tG, tL, tS" DIP switch
Setting of the action time of the asymmetric grounding (neutral connection) fault, overload long time
delay and short time delay. See the corresponding table under the DIP switch for the setting time
7
"Fault Check" key
Press this button to display the previous line fault protection section of the system memory
8
“Select” key
Press this key to cyclically display L1, L2and L3phase currents or fault check status to cyclically
display the fault current or the time value
9
"Test" key
During normal operation, press the test button, and the controller will send out instantaneous trip
signals to test the action performance of the circuit breaker
10
"Clear Light" key
After the test trip, phase current selection, fault check and fault trip, press the clear light key to
restore the controller to a normal working state
11
"Overload" indicator light
When the light is on, it means that the load current has exceeded the overload long time delay
protection current value, and the overload long time delay starts to delay the action or the alarm
12
"Phase Current" indicator
light
Display L1, L2 and L3 phase currents, and show the phase with the largest current during the
operation
13
"MCU" indicator light
During normal operation,the MCU light is normally on, and goes out duringself-diagnosis and power
failures
6.2.2 Interface symbols, indicator lights and key descriptions of 2,000 A (and above) shell frame 2M
(digital) intelligent controller
Serial
number
Symbol/Name
Definition
1
Reset button
After the release is interrupteddue to thecircuit breakerfault, it is requiredto press this buttonbefore
the circuit breaker can be closed again
2
In
Circuit breaker rated current
3
Digital display window
Parameters such as current, voltage, frequency, setting and fault are displayed in the window
4
“Test” indicator light
Display when setting the test trip and no trip (corresponding to the test area)
5
"Fault Display" area indicator
light
Ir4 indicates grounding current, Ir1 indicates long time delay current, Ir2 indicates short time delay
current, Ir3 indicates instantaneous current, time setting and fault display
6
"Load 1, Load 2" indicator
light
Load Monitoring 1 & Load Monitoring 2 current setting and alarm indicator light
7
“Setting” key
Select keys for setting parameters (current and time) of the items such as grounding, long time delay
and short time delay
8
"Trip" key
Check whether the opening function of the intelligent controller is normal (the circuit breaker is
closed first) or not
9
“No Trip” key
Check whether the intelligent controller's “Alarm Only Without Opening" function is normal (the
circuit breaker is closed first) or not
10
"Save" key
After setting the parameters, press the "Save" key to save them
11
Power interface
DC 24 V power input port;
12
"+/-" key
When adjusting parameters, press the "+" key for increasing and the "-" key for decreasing
13
"Fault Check" key
Press this button to display the previous line fault protection section of the system memory
14
"Display Check" key
Press "Clear Light” and then the "Display Check" key for three seconds to turn on all lights and digital
tubes, then release the key to turn off all lights
15
"Clear Light" key
After the test trip, phase current selection, fault check and fault trip, press the clear light key to
restore the controller to a normal working state
16
“Select” key
Press this key to cyclically display L1, L2and L3phase currents or fault check status to cyclically
display the fault current or the time value
17
"G, L1, L2, L3, MAX"
indicator lights
Four-phase, grounding and maximum phase current indicator lights, corresponding to the maximum
current phase and MAX indicator light
18
"A, kA, s" indicator light
Current and time unit indicator light, where A indicates ampere (long time delay and short time
delay), kA indicates kiloampere (instantaneous), and s indicates second

HUW1
Series Intelligent Universal Circuit Breaker
11
6.2.3 Interface symbols, indicator lights and key descriptions of 2,000 A (and above) shell frame 3H
(liquid crystal) intelligent controller
Serial
number
Symbol/Name
Definition
1
Reset button
After the release is interrupteddue to thecircuit breakerfault, it is requiredto press this buttonbefore
the circuit breaker can be closed again
2
In
Circuit breaker rated current
3
Liquid crystal display (LCD)
Display all measurement parameters, system setting parameters, protection setting parameters and
all information in Chinese
4
Overload and short-circuit
protection area
When the current protection is set, the indicator light of this area is always on, indicating that the
protection current value or delay time value of the corresponding area is being set;
5
Grounding protection area
In case of fault or alarm, the indicator light of this area flashes, indicatingthat the corresponding area
is in fault protection or alarm;
6
"System Settings" key
Quickly switch to the "System Settings" main menu ("Right Arrow" when adjusting thesystem clock)
7
"Running Parameters"
key
Quickly switch to the "Running Parameters" main menu ("Left Arrow" when adjusting the system
clock)
8
"Up Arrow" key
Move the cursor up, change the selected parameter up, or position the display to the left
9
"Down Arrow" key
Move the cursor down, change the selected parameter down, or position the display to the right
10
"Exit" key
Exit the current menu to enter the previous menu, or cancel the modification of the current
parameters
11
Test interface
It has three functions: DC 24 V power input port, analog signal input port, programming and
communication interface
12
"Enter" key
Enter the next menu of the item pointed by the current cursor, select the current parameter, or save
the modification
13
"Information Inquiry"
key
Quickly switch to the "Information Inquiry" main menu
14
"Protection Settings"
key
Quickly switch to the "Protection Settings" main menu
15
“Communication” indicator
light
The communication indicator light is on, indicating that communication data is transmitted; the light
goes off when there is no communication data transmission.
16
"Normal" indicator light
After the controlleris powered on, the "Normal" indicator light keeps flashing. If the light does not turn
on after power-on, the intelligent controller is not working properly and shall be replaced
immediately.
17
"Fault/Alarm" indicator light
During normal operation, the fault or alarm indicator light is not on; when the "Fault/Alarm" indicator
light flashes, there must be a fault in the system.
18
"Reset" key
Reset to enter the reset (running) state in a fault trip or an alarm state
Note: Due to the rapid upgrade of the intelligent controller, its physical interface may be different from the existing instruction. Please refer to the
physical object.
6.3 Function configuration table of the intelligent controller
Controller
type
DIP type (L)
Digital type (M)
Liquid crystal type (M, H)
Standard
functions
●Long time
delay protection
●Short-circuit
instantaneous
protection
●Parameter
setting
●Indicator light
display
●Fault
self-diagnosis
●Fault memory
●Thermal
memory
●Test trip
●Long time delay protection
●Short time delay protection
●Short-circuit instantaneous
protection
●Grounding protection (vector sum
type)
●Parameter setting
●Digital display
●Test trip
●Effective value protection
●Test function
●Fault memory
●Fault self-diagnosis
●Thermal memory
●More protection functions, including
six optional characteristic curves
●Contact wear and mechanical life
indication
●Load monitoring (Mode I)
●Short-circuit instantaneous
protection
●Short time delay fixed time
protection
●Multi-curve short time delay inverse
time protection
●Multi-curve long time delay
protection
●Current imbalance protection
●Grounding protection (vector sum
type)
●Neutral phase protection
●Disconnection self-diagnosis
●Load monitoring (Mode I)
●Undervoltage protection
●Overvoltage protection
●Voltage imbalance protection
●Communication function (Type H)
●Thermal memory
●Three-/four-phase current
●Asymmetric grounding current
●Long time delay heat capacity
●Phase & Line voltage
●Voltage imbalance
●Frequency
●Phase sequence
●Power
●Power factor
●Current waveform
●Harmonic influence
coefficient of power grid
●Chinese graphic liquid crystal
display
●LED status indication
●Keyboard operation
●Eight fault records
●Eight alarm records
●Eight shift records
●Main contact wear equivalent
●Number of operations
●Number of trips
●System clock
●Test & Lock
●Fault self-diagnosis
Optional
functions
●Short time
delay protection
●Grounding
protection (vector
sum type)
●Alarm signal
output
●Contact output of four groups of
signals
●MCR and HSISC protection
●Menu functions
Measurement: Voltage, frequency,
power factor, active power, active watt
hour
●Power grid parameter history
recording
●Output of four groups of contacts
●Leakage protection (with special
transformer)
Note: No grounding protection is
required when provided with leakage
protection
●Demand value measurement and
protection
●Temperature control monitoring and
protection
●Zone selective interlock
●Overfrequency protection
●Phase sequence protection
●Reverse power protection
●Reclosing
●Underfrequency protection
●MCR and HSISC protection

HUW1
Series Intelligent Universal Circuit Breaker
12
6.4 Protection characteristics of the intelligent controller
6.4.1 Long time delay protection and curve
The long overload delay protection function is generally used to protect the cable from the overload based on the
true RMS of the current.
The long-delay action current is continuously adjustable, and the tripping time is of inverse time characteristic.
The adjustment step of the short-time key is 1A (2A for 2,000 A above).
Distribution protection current set value lr
(0.4–1.0) In+OFF
Current tolerance
±10%
Generator protection current set value lr
(0.4–1.25) In+OFF
Applied current I
Agreed tripping time
1.05Ir
>2h No trip
1.3Ir
<1h Trip
Type of protection
characteristics
Fault
current
Setting time Tr (s)
SI
Standard inverse
time lag
1.5Ir
0.61
0.98
1.47
2.46
3.68
4.91
6.14
9.21
11.05
17.19
24.56
36.84
49.13
61.41
73.69
85.97
2Ir
0.36
0.57
0.86
1.43
2.15
2.87
3.58
5.37
6.45
10.03
14.33
21.49
28.65
35.82
42.98
50.15
6Ir
0.14
0.22
0.33
0.55
0.82
1.1
1.37
2.06
2.47
3.84
5.48
8.22
10.96
13.7
16.45
19.19
7.2Ir
0.12
0.2
0.3
0.5
0.74
0.99
1.24
1.86
2.23
3.48
4.97
7.45
9.93
12.42
14.9
17.38
VI
Very inverse time
lag
1.5Ir
2
3.2
4.8
8
12
16
20
27
36.6
56
80
120
160
200
240
280
2Ir
1
1.6
2.4
4
6
8
10
13.5
18
28
40
60
80
100
120
140
6Ir
0.2
0.32
0.48
0.8
1.2
1.6
2
2.7
3.6
5.6
8
12
16
20
24
28
7.2Ir
0.16
0.26
0.39
0.65
0.97
1.29
1.61
2.18
2.9
4.52
6.45
9.68
12.9
16.13
19.35
22.58
EI（G）
Extreme inverse
time lag (for general
distribution
protection)
1.5Ir
8
12.8
19.2
32
48
64
80
108
144
224
320
480
640
800
960
1000
2Ir
3.33
5.33
8
13.33
20
26.67
33.33
45
60
93.33
133.33
200
266.67
333.33
400
433.33
6Ir
0.29
0.46
0.69
1.14
1.71
2.29
2.86
3.86
5.14
8
11.43
17.14
22.86
28.57
34.29
37.14
7.2Ir
0.2
0.31
0.47
0.79
1.18
1.57
1.97
2.66
3.58
5.51
7.87
11.8
15.74
19.67
23.6
25.57
EI（M）
Extreme inverse
time lag (for motor
protection)
1.5Ir
6.22
9.96
14.93
24.89
37.34
49.78
62.23
84.01
112.01
174.24
248.91
373.37
497.82
622.28
746.73
208.96
2Ir
2.95
4.72
7.07
11.79
17.69
23.58
29.48
39.79
53.06
82.53
117.9
176.86
235.81
294.76
353.71
383.19
6Ir
0.28
0.45
0.68
1.13
1.69
2.26
2. 82
3.81
5.08
7.9
11.29
16.94
22.58
28.23
33.88
36.7
7.2Ir
0.2
0.31
0.47
0.78
1.17
1.56
1.95
2.63
3.51
5.46
7.8
11.7
15.61
19.51
23.41
25.36
HV
High voltage fuse
compatibility
1.5Ir
2.46
3.94
5.91
9.85
14.77
19.69
24.62
33.23
44.31
68.92
98.46
147.69
196.92
246.15
295.38
320
2Ir
0.67
1.07
1.6
2.67
4
5.33
6.67
9
12
18.67
26.67
40
53.33
66.67
80
86.67
6Ir
0.01
0.01
0.02
0.03
0.05
0.06
0.08
0.1
0.14
0.22
0.31
0.46
0.62
0.77
0.93
1
7.2Ir
0
0.01
0.01
0.01
0.02
0.03
0.04
0.05
0.07
0.1
0.15
0.22
0.3
0.37
0.45
0.48
I2T
Universal inverse
time protection
1.5Ir
15
30
60
120
240
360
480
600
720
840
960
2Ir
8.44
16.88
33.75
67.5
135
202.5
270
337.5
405
472.5
540
6Ir
0.94
1.88
3.75
7.5
15
22.5
30
37.5
45
52.5
60
7.2Ir
0.65
1.3
2.6
5.21
10.42
15.63
20.83
26.04
31.25
36.46
41.67
Note 1: This table takes the set value of the long time delay action duration of the LCD intelligent controller as an example.
Note 2: Action time error ±15%

HUW1
Series Intelligent Universal Circuit Breaker
13
6.4.2 Thermal memory protection
Repeated overload may cause the conductor to heat up. The intelligent controller has the function of simulating
the heating effect of the bimetallic strip after the action of the fault delay such as overload or short time delay.
Setting time for heat capacity cooling: Instantaneous, 10 min, 20 min, 30 min, 1 h, 2 h, 3 h, OFF
Note: Power failure of the intelligent controller can eliminate thermal memory protection.
6.4.3 Short-circuit short time delay protection and curve
Short time delay protection prevents the impedance short circuit of the distribution system. This kind of short
circuit is usually caused by the local short circuit fault of the line, and the current generally exceeds the overload
range, but the short-circuit current is not very large.
The trip delay of short-circuit short time delay is to realize selective protection.
Short-circuit delay protection is based on the true RMS of the current, which can be divided into inverse time
period and fixed time period; and further strengthen the cooperation with the lower protection device.
Short time delay protection can be provided with zone selective interlock function.
Action current set value Isd
(1.5–15) Ir+0FF
Current tolerance
±10%
Inverse time delay action time
Tsd
The curve is the same as the overload long time delay curve, and the curve speed is 10
times faster than the overload long time delay curve (the time calculated by the overload
delay time curve formula divided by 10 is the short time delay inverse time delay time)
Fixed time delay set value Tsd
0.1 s –1 s (differential: 0.1 s)
Note: When both inverse time protection and fixed time protection are on, the set value of the inverse time
current must be less than that of the fixed time current, otherwise the inverse time function will automatically fail. Also,
the actual inverse time delay time shall not be less than the setting time of the fixed time limit.
6.4.4 Short-circuit instantaneous protection and curve
The instantaneous protection function prevents the load short circuit of the distribution system. This short circuit
is usually an interphase fault, with a large short-circuit current, which needs to be quickly disconnected. This
protection is based on the true RMS of the current.
Action current set
value Ii
(1.0–20) Ir+OFF
Current tolerance
±10%
Action characteristics
≤0.85 Ii No action
>1.15 Ii Action
Note 1: The protection parameters shall not be cross-set, and shall comply with Ir<Isd<Ii.
Note 2: The maximum instantaneous action current of HUW1-6300 is set as 100 kA.
6.4.5 Grounding protection and curve
There are two protection modes for the ground fault caused by equipment insulation damage, including residual
current (difference) type (T) and ground current type (W). The T-type detection of the zero sequence current, that is,
the vector sum of four-phase (three-phase, four-wire system) or three-phase (three-phase, three-wire system)
current is taken for protection. The ground current directly detects the current on the grounding cable through a
special external transformer, which can simultaneously protect the upper and lower ground faults of the circuit
breaker.
Action current set value Ig
(0.2–1.0) In + OFF
Current
tolerance
±10%
Action characteristics
<0.8 Ig No action
≥1.1 Ig Action
Action time Tg
Time tolerance
±10%
Fixed time setting
0.1–1s+OFF
Inverse time shear
coefficient Cr
1.5–6 + OFF
Inverse time formula
t = Tg×Cr×Ig/I
t — delay time
Ig— set action
current
Tg— set delay
time
I — ground fault
current
Cr— shear
coefficient
Note 1: When the multiple of the fault current (I/Ig) is less than Cr, the action is of inverse time characteristic;
when the multiple of the fault current is greater than or equal to Cr, the action is of fixed time characteristic.
Note 2: The functions of grounding alarm and grounding protection are independent of each other, with
independent parameter settings, which can coexist.

HUW1
Series Intelligent Universal Circuit Breaker
14
Ground fault protection mode and electrical schematic diagram
Mode 1 (difference type)
TN-C, TN-C-S and TN-S distribution systems use three-pole circuit
breakers without neutral current transformers.
●The vector sum of the three-phase current is taken for the
ground fault protection signal.
●The protection characteristics are fixed time or inverse time
protection.
Mode II (difference type)
The four-pole circuit breaker with built-in neutral current transformer
is used in the TN-S distribution system.
●The vector sum of the four-phase current is taken for the ground
fault protection signal.
●The protection characteristics are fixed time or inverse time
protection.
Mode III (difference type)
The three-pole circuit breaker with external neutral current
transformer is used in the TN-S distribution system.
●The vector sum of the three-phase current and the N-phase
current is taken for the ground fault protection signal.
●The protection characteristics are fixed time or inverse time
protection.
Note: The conductor length of the neutral current transformer is not
more than 2 meters.
Mode IV (ground current type)
The three-pole circuit breaker with external ground current
transformer is used in the ground current protection distribution
system.
●Provided with additional special current transformer.
●The distance between the special current transformer and the
circuit breaker is not more than 10 meters.
6.4.6 Neutral line protection
The cable and current characteristics used in the neutral phase are often quite different from those of other three
phases, and intelligent controllers implement different protections for the neutral phase according to different
applications. When the neutral line is thin, it can be protected by semi-fixed value method; when the neutral line is the
same as other phases, it can be protected by full fixed value; and when the harmonics in the power grid are serious,
double fixed value or 1.6 times fixed value can be used for protection.
Action current set
value IN
(0.5, 1.0) In + OFF
Current tolerance
±10%
Action time TN
Same as overload long time delay duration
6.4.7 Current imbalance protection
The current imbalance protection protects the open-phase and three-phase current imbalance, and performs
protection actions according to the imbalance rate between the three-phase currents. When the execution mode is
“Alarm”, its action principle is the same as that of grounding protection.
Transformer
Transformer
Transformer
Transformer
Intelligent
controller
Intelligent
controller
Intelligent
controller
Intelligent
controller

HUW1
Series Intelligent Universal Circuit Breaker
15
Protection set value
5% –60% (step length: 1%)
Delay time
0.1 s –40 s (step length: 0.1 s)
Protection return set value
5% –starting value (step:1%)
Delay time
10s –200s
No action characteristics
≤0.9 (actual current imbalance rate/set value), no action
Action characteristics
>1.1 (actual current imbalance rate/set value), action
6.4.8 Load monitoring
Load monitoring can be used for pre-alarm and branch load control. The action principle is based on the power or
current monitoring, with two optional modes.
Mode I: The load of two branches can be independently controlled. When the operating parameters exceed the
setting value, the corresponding load monitors the DO delay action (corresponding DO function needs to be set), and
controls the load of two branches to be interrupted to ensure the power supply of the main system.
Mode II: Generally, it is used to control the load of the same branch. When the operating parameters exceed the
starting value, the "Load Monitoring I" DO delays the action (the action form can be pulse mode or level mode) to
interrupt the branch load. If the operating parameter value is lower than the return value after the interruption, and
after the delay set time, the "Load Monitoring I" DO returns, and the "Load Monitoring II" DO acts to connect the
interrupted load and restore the power supply of the system.
Unloading I action settings
Current mode 1/2
Setting current IC1, IC2
(0.2 –1) Ir
Power mode 1/2
Setting power PC1, PC2
200 kW –10,000 kW
Unloading I delay settings
Current mode 1/2
Current delay time TC1, TC2
(20% –80%) Tr
Power mode 1/2
Power delay time TC1, TC2
10 s–3,600 s
Unloading II action settings
Current mode 1
Setting current IC1 (starting value)
(0.2 –1) Ir
Current mode 2
Setting current IC2 (return value)
0.2Ir–IC1
Power mode 1
Setting power PC1 (starting value)
200 kW–10,000 kW
Power mode 2
Setting power PC2 (return value)
100 kW–PC1
Unloading II delay settings
Current mode 1
Current delay time TC1
(20% –80%) Tr
Current mode 2
Current delay time TC2
10 s–600 s
Power mode 1/2
Power delay time TC1, TC2
10 s–3,600 s
Protection alarm DO output
Set one DO of the signal unit to "Load Monitoring I" and another to
"Load Monitoring II".
Note: In Mode II, Ic1≥Ic2 or Pc1≥Pc2 is required.
6.4.9 Residual current (leakage) protection
It is suitable for the leakage fault caused by equipment insulation damage or human contact with exposed
conductive parts, and the residual current set value 1Δnis irrelevant to the rated current of the circuit breaker. The
signal sampling mode is zero sequence sampling, and a rectangular transformer is required. This sampling has high
accuracy and sensitivity, which is suitable for the protection of the small current.
Action current set value
1Δn
0.5A–30A+OFF
Current tolerance
±10%
Action characteristics
< 0.8lΔn, no action
≥1.01Δn, action
Delay time setting TΔn
(s)
Instantaneous
0.06
0.08
0.17
0.25
0.33
0.42
0.5
0.58
0.67
0.75
0.83
Maximum
breaking time
of fault current
(s)
IΔn
0.04
0.36
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
2lΔn
0.04
0.18
0.25
0.5
0.75
1
1.25
1.5
1.75
2
2.25
2.5
5lΔn,
10lΔn
0.04
0.07
0. 1
0.2
0.3
0. 4
0.5
0.6
0.7
0.8
0.9
1

HUW1
Series Intelligent Universal Circuit Breaker
16
Electrical diagram of residual current protection
6.4.10 Overvoltage protection
The intelligent controller measures the effective value of the primary circuit voltage. When all three
phase-to-phase voltages (line voltages) are greater than the set value, that is, when the minimum value of the three
line voltages is greater than the set value of the overvoltage protection, the overvoltage protection acts; when the
minimum value of the three line voltages is less than the return value, the alarm action returns.
Action threshold (V)
Return threshold –1,200 (step length: 1)
Action delay time (s)
0.2–60 (step length: 0.1)
Return threshold (V)
100–action threshold (step length: 1)
This set value is only available when the execution mode is
"Alarm", and the starting value must be greater than or equal to
the return value.
Return delay time (s)
0.2 –60 (step length: 0.1)
Action or alarm
characteristics
(delay tolerance±10%)
Umin/action threshold ≥1.1 Fixed time action or alarm
Umin/action threshold <0.9 No action or alarm
Overvoltage alarm return
characteristics
(delay tolerance±10%)
Umax/action threshold ≤0.9 Return
Umax/action threshold >1.1 No return
Alarm contact output
When the execution mode is “Alarm”, the "Overvoltage Alarm" contact output can be added
6.4.11 Voltage imbalance protection
Voltage imbalance rate protection acts according to the imbalance rate between three line voltages. The
intelligent controller measures the voltage imbalance rate, and performs protection action when the voltage
imbalance rate is greater than the action threshold; when the voltage imbalance rate is less than the return threshold,
the alarm action returns.
Action threshold
2% – 30% (differential: 1%)
Action delay time (s)
0.2 – 60 (differential: 0.1)
Return threshold
2% – Starting value (differential:
1%)
This set value is only available when the execution mode is "Alarm",
and the return value must be less than or equal to the starting value.
Return delay time (s)
0.2 – 60 (differential: 0.1)
Action or alarm
characteristics
(delay tolerance±10%)
Actual voltage imbalance rate/set value ≥1.1 Fixed time action or alarm
Actual voltage imbalance rate/set value <0.9 No action or alarm
Voltage imbalance alarm
return characteristics
(delay tolerance±10%)
Actual voltage imbalance rate/set value ≤0.9 Return
Actual voltage imbalance rate/set value >1.1 No return
Alarm contact output
When the execution mode is “Alarm”, the "Voltage Imbalance Alarm" contact output can be added
6.4.12 Phase sequence protection
Phase sequence detection is taken from the primary voltage. When it is detected that the phase sequence is the
same as the setting direction of the starting value, the protection action is instantaneous. When one or more phases
of voltage do not exist, this function will automatically exit.
Setting range of action phase
sequence
∆φ: A, B, C/∆φ: A, C, B
Alarm contact output
When the execution mode is “Alarm”, the "Phase Sequence Fault Alarm" contact output can be
added
Protection execution mode
Alarm/trip/shutdown
Transformer
Intelligent
controller
Intelligent
controller
Transformer
RCD: Zero sequence
current transformer
R: Ground resistor

HUW1
Series Intelligent Universal Circuit Breaker
17
6.4.13 Undervoltage protection
The intelligent controller measures the true RMS of the primary circuit voltage. When all three phase-to-phase
voltages (line voltages) are less than the set value, that is, when the maximum value of three line voltages is less than
the set value of the undervoltage protection, the undervoltage protection acts; when the maximum value of three line
voltages is greater than the return value, the alarm action returns.
Action threshold (V)
100–return threshold (step length: 1)
Action delay time (s)
0.2–60 (step length: 0.1)
Return threshold (V)
Action threshold –1,200 (step length: 1)
This set value is only available when the execution mode is
"Alarm", and the return value must be greater than or equal to
the starting value.
Action delay time (s)
0.2–60 (step length: 0.1)
Action or alarm
characteristics
(delay tolerance±10%)
Umax/action threshold ≤0.9
Fixed time action
Umax/action threshold >1.1
No action
Undervoltage alarm return
characteristics
(delay tolerance±10%)
Umin/action threshold >1.1
Fixed time return
Umin/action threshold ≤0.9
No return
Alarm contact output
When the execution mode is “Alarm”, the "Undervoltage Alarm" contact output can be added
6.4.14 Demand current protection
Calculate the demand value of the true RMS of each phase current in a sliding time window, and perform
protection action when the demand value exceeds the limit. When the execution mode is “Alarm”, its action principle
is the same as that of grounding alarm. The setting of the sliding time window is in the menu item "Meter Settings" (the
parameters are set in the same way for phases A, B, C and N).
Protection starting set value (A)
(0.2–1.0) In
Action delay time set value (s)
15–1,500
Protectionactionreturn set value(A)
0.2 In–starting set value
This set value is only available when the execution mode is "Alarm".
Protection return delay time (s)
15–3,000 s
Demand current action
characteristics
(delay tolerance±10%)
I/Starting set value≤0.9
No action
I/Starting set value>1.1
Fixed time action
Demand current return
characteristics
(delay tolerance±10%)
I/Return set value>1.1
No return
I/Return set value≤0.9
Fixed time return
Protection execution mode
Alarm/trip/shutdown
6.4.15 Underfrequency & Overfrequency protection
The intelligent controller detects the frequency of the system voltage, and can perform protection if the frequency
is too high or too low. The action principle and characteristics of overfrequency and underfrequency protection are the
same as those of overvoltage and undervoltage protection.
Setting range of
different
parameters
Action threshold
Underfrequency
45 –return value (step length: 0.5 Hz)
Overfrequency
Return value –65 Hz (step length: 0.5 Hz)
Action delay time
0.2–5.0 s (step length: 0.1 s)
Return threshold
Underfrequency
Starting value –65 Hz
This set value is only available when the
execution mode is "Alarm"
Overfrequency
45 Hz –starting value
Return delay time
0.2 –36.0 s (step length: 0.1 s)
Alarm contact
output
When the execution mode is “Alarm”, the "Underfrequency Alarm" and “Overfrequency Alarm” contact output can be
added
Protection
execution mode
Alarm/trip/shutdown

HUW1
Series Intelligent Universal Circuit Breaker
18
6.4.16 Reverse power protection
The sum of three-phase active power is taken for the inverse power protection. When the direction of power flow
is opposite to that of the user’s setting power and greater than the set value, the protection starts. The direction of
power and the incoming direction of power supply are set in the "Meter Settings" menu, which must be consistent with
the actual application. Its action principle is the same as overvoltage protection.
Protection starting set value
5–500 kW
Protection action delay time set
value
0.2–20 s
Protection action return set value
5 kW –starting set value
This set value is only available when the execution mode is "Alarm",
and the return value must be greater than or equal to the starting
value.
Protection return delay time
1.0–360 s
Protection alarm DO output
Set one DO of the signal unit to "Power Failure".
Protection execution mode
Alarm/trip/shutdown
6.4.17 MCR and HSISC protection
MCR and HSISC are instantaneous protection for the adjustment of the circuit breaker itself. When the
out-of-limit fault current generates, the intelligent controller will issue a trip instruction within 10 ms. Among them,
MCR protects the switch-on ability of the circuit breaker to prevent the switch from being damaged due to the
switch-on current exceeding the switch-on limit ability, and the protection works at the moment of opening and closing
of the circuit breaker (within 100 ms). HSISC protects the maximum carrying capacity of the circuit breaker to prevent
the switch from carrying the current exceeding the maximum breaking capacity, which will take effect after closing for
100 ms.
MCR, HSISC action current set value (kA)
30 –100
No action characteristics
< 0.80I/Ii
No action
Action characteristics
> 1.0I/Ii
Action
Action delay
< 20ms
Note: This group of set values is generally set according to the breaking capacity of the circuit breaker when the
circuit breaker leaves the factory, and is not adjustable by the end user.
Factory default MCR: HUW1-1000/20 kA; HUW1-2000 above /50 kA.
HSISC: HUW1-1000/30kA; HUW1-2000/50kA; HUW1-3200/65kA; HUW1-4000/80kA; HUW1-6300/100kA.
6.4.18 Self-diagnosis
The intelligent controller can diagnose its own faults, including ultra-high ambient temperature, error of E2PROM
data, error of A/D sampling, and circuit breaker failing to act.
6.4.19 Contact wear indication
The intelligent controller can display the current contact wear on the screen. When the intelligent controller
leaves the factory, the display value is 100%, which means that the contact is not worn. When the display value drops
to 60%, an alarm signal will be sent to remind the user to take maintenance measures timely. After the contact is
replaced, it can be restored to the initial wear value through setup.
6.4.20 Test & Lock
There are three test modes for test tripping, namely three-section protection, grounding/leakage fault and
mechanism action time.
Three-section protection test: Input the fault current to simulate the protection of the controller when the overload,
short circuit or transient fault occurs.
Grounding/leakage fault test: Input the grounding/leakage fault current to simulate the protection of the controller
when the grounding/leakage fault occurs.
Mechanism action time test: Force the magnetic flux converter to act to test the inherent mechanical time of
circuit breaker tripping.
6.4.21 Zone selective interlock
In the same power circuit, two or more circuit breakers with superior-subordinate relationship can realize zone
selective interlock, which includes short-circuit interlock and grounding interlock. There are two possibilities for this
interlock according to the location of the fault.
1. When the location of the short circuit or ground fault is at the outgoing side of the subordinate circuit breaker
(2#–4# circuit breaker), such as location ②, the subordinate circuit breaker trips instantaneously and sends a
regional interlock signal to the superior circuit breaker; the superior circuit breaker (1# circuit breaker) receives the
regional interlock trip signal and delays according to the short circuit or grounding protection settings. If the fault
current is eliminated during the delay of the superior circuit breaker, the protection will return and the superior circuit
breaker will not act; if the fault current of the subordinate circuit breaker is still not eliminated after tripping, the
superior circuit breaker will act according to the short-circuit or grounding protection setting to cut off the fault line.