COMPERE KPM83MD User manual

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HENAN COMPERE SMART TECHNOLOGY CO., LTD.
KPM83MD Motor Protection & Monitoring
Deivice
User Manual

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Application
Suitable for protection and monitoring of power system equipment below 35KV.
Hardware
◆ Back plugging and unplugging module, separated the Highand Low voltage; the
reinforced unit chassis is designed to resist strong vibration and interference. It can be
decentralized mounted in the switch cabinet for running
◆ 32-bit microcomputer processor, large-capacity RAM and Flash Memor y, strong
ability of data processing, logic operation and information storage, fast running speed
and high reliability
◆ 16-bit high-precision A/D, high measurement accuracy
◆ Running and event reports can be saved no less than 32 recent events
◆ Graphic LCD, menu operation
Main Features
◆ Multi-tasking operating system, modular programming; good real-time performance and
high reliability.
◆ Standard communication protocol for easy communication with PC monitoring or gateway.
◆ Complete circuit breaker operation loop, setting the remote control function of the circuit
breaker.
◆ Protection and measurement and control integration, single device interval complete main
function.
Our company reser ves the right to modify this manual; if the product does not conform
to the manual, please refer to the actual product description.
2021.4

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Contents
1 Summary.............................................................................................................................................. 5
1.1 Scope of application.................................................................................................................. 5
1.2 Protection characteristics............................................................................................... 5
1.3 Protection configuration................................................................................................... 5
1.3.1 Protection function configuration......................................................................5
1.3.2 Measurement and control function........................................................................6
1.3.3 Communication function............................................................................................ 6
1.3.4 GPS timing function ................................................................................................. 7
1.3.5 Protection information function..........................................................................7
2 Technical parameter........................................................................................................................ 7
2.1 Environmental parameters................................................................................................... 7
2.2 Rated electrical parameters............................................................................................. 7
2.3 Main technical indicators................................................................................................. 8
3 Protection menu description........................................................................................................ 9
3.1 Protection on&off menu.......................................................................................................................9
3.2 Protection setting menu................................................................................................... 10
4 Protection Principle ................................................................................................................. 13
4.1 Judgment of motor startup and shutdown..................................................................... 13
4.2 Differential quick break................................................................................................. 14
4.3 Ratio differential............................................................................................................. 14
4.4 Differential current out of limit............................................................................... 15
4.5 CT disconnection........................................................ 16
4.6 Quick break ............................................................ 16
4.7 Time-limited quick break ............................................... 17
4.8 Overcurrent ............................................................ 17
4.9 Overcurrent inverse time limit ......................................... 18
4.10 Low voltage blocking over current protection .......................... 18
4.11 Overload .............................................................. 19
4.12 Locked-rotor protection ............................................... 20
4.13 Negative sequence overcurrent section I ............................... 20
4.14 Negative sequence overcurrent section II .............................. 20
4.15 Negative sequence overcurrent section II inverse time limit ........... 21
4.16 Zero sequence overcurrent ............................................. 21
4.17 Overheat protection alarm/trip ........................................ 22
4.18 Over frequency protection ............................................. 22
4.19 Low frequency load shedding ........................................... 23
4.20 Overvoltage ........................................................... 23
4.21 Low voltage ........................................................... 24
4.22 PT disconnection ...................................................... 24
4.23 PT voltage loss................................................................................................................ 25
4.24 System loses power.......................................................................................................... 25
4.25 Control loop disconnection.......................................................................................... 26

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4.26 Non-electric protection................................................................................................. 26
5 Hardware principle description................................................................................................ 28
5.1 Panel size diagram of the device................................................................................. 28
5.2 Hole diagram of the device ..................................................................................... 29
5.3 Device terminal diagram description........................................................................... 30
5.4 Description of device schematic diagram................................................................... 32
6 Device instructions...................................................................................................................... 33
6.1 Panel indicator description........................................................................................... 33
6.2 Key instructions................................................................................................................ 33
6.3 LCD description................................................................................................................... 34
6.4 Device menu function description...........................................................................................34
6.4.1 Protection on & off....................................................................................................... 35
6.4.2 Protection setting operation.......................................................................................... 35
6.4.3 Event record query....................................................................................................... 36
6.4.4 Input / output query and operation............................................................................... 36
6.4.5 Sampling value query（the secondary value）........................................................... 38
6.4.6 Measure & monitor query............................................................................................39
6.4.7 Electric energy monitoring query................................................................................. 36
6.4.8 Real time clock query................................................................................................... 39
6.4.9 Factory settings ............................................................................................................ 40
6.4.10 Equipment information .............................................................................................. 41

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1 Summary
1.1 Scope of application
KPM83MD is applicable to the protection, measurement and control of asynchronous motors
of ungrounded system, resistance grounding system and direct grounding system with voltage
below 10kV, as well as 2000kW and above asynchronous motors with differential protection. It
can be installed on the panel or locally in the switchgear.。
1.2 Protection characteristics
Humanized design interface: large screen LCD display, real-time display of current, voltage,
power, frequency and other electrical quantities, Chinese operation menu is simple and easy
to use, clearly display the whole process of protection action, and make the action process
transparent.
Superior sampling performance: the protection circuit and measurement circuit have
independent sampling circuit, which not only ensures the monitoring accuracy, but also
ensures the anti saturation performance of the protection.
Independent outlet: all outlet relays use a channel separately to facilitate the input and exit of
protection. Remote control opening and closing, protection tripping, accident signal, warning
signal and other special signal outlets can be configured separately.
Strong self-protection function: each circuit breaker corresponds to an operation circuit, and
the switch can be operated directly in case of emergency; In addition, the device has the
circuit breaker tripping and closing coil protection function to avoid burning the circuit
breaker coil due to mechanical refusal.
Strong substitutability: the protection device has powerful function and "four remote"
function, which can completely replace the protection of conventional relay. The fully
embedded digital platform structure greatly reduces the amount of maintenance.
Flexible design: according to the site conditions, it can be designed into centralized panel
type or dispersed in the switchgear.
Reliable operation: perfect self-test system, hardware detection and relay tripping outlet all
adopt reliable element.
1.3 Protection configuration
1.3.1 Protection function configuration
Differential quick break （trip）
Ratio differential （trip）
Differential current out of limit alarm
CT disconnection （alarm，CT disconnection locking ratio differential）
Quick break （trip）
Time limited quick break （trip）
Overcurrent （trip，with low voltage locking）
Overcurrent inverse time limit （trip average / extraordinary / extreme / retreat）
Overload （alarm / trip）

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Locked rotor protection （trip）
Negative sequence section I （trip）
Negative sequence section II （alarm /trip optional）
Inverse time limit of negative sequence section II （trip，general / extraordinary /
extreme optional）
Zero sequence overcurrent （alarm /trip optional）
Overheat protection alarm （alarm）
Overheat protection trip （trip）
Over frequency protection （trip）
Under frequency unloading protection （trip）
Overvoltage protection （trip）
Under voltage protection （trip）
PT disconnection （alarm）
PT voltage loss （alarm）
Non electric quantity protection （temperature rise, over temperature, electrical
accident）
System power loss （trip）
Control loop disconnection （alarm）
1.3.2 Measurement and control function
Measuring voltage：Uab、Ubc、Uca、Ua、Ub、Uc；
Measuring current：Ia、Ib、Ic；
Power：P、Q、COS；
Frequency：f；
Electric energy：EP+、EP-、EQ+、EQ-；
With 14 channels of remote signal input acquisition；
10 relay outlets (including 1 alarm / trip respectively), which can be expanded by 3;
Power loss signal of 1-way device；
Event SOE record；
1.3.3 Communication function
Communication interface：
1-way Ethernet port
1-way 485 port
1 channel B code timing port (also used as the second channel 485
communication port)
Communication protocol：103 communication protocol, Modbus RTU protocol。

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1.3.4 GPS timing function
Support IRIG-B timing.
1.3.5 Protection information function
Remote viewing of device description.
Remote viewing of equipment parameter settings.
Remote viewing and modification of protection setting value and area code.
Remote viewing, remote control and local on-off functions of soft pressing plate status.
Remote viewing of device protection input status.
Remote viewing of device operation status (including the status of protection action
elements, self inspection alarm information, etc.).
Remote device signal reset.
2 Technical parameter
2.1 Environmental parameters
Normal operating temperature：-10 ～55 ℃
Limit operating temperature：-20 ～60 ℃
Storage and transportation：-30 ～70 ℃
Atmospheric pressure：60 ～110 Kpa
2.2 Rated electrical parameters
Frequency：50Hz
AC current：5A or 1A（rated current: In）
AC voltage：100V or 57.7V（rated voltage: Un）
AC / DC working power ：AC：AC85V~265V；50Hz±0.5Hz；Harmonic distortion rate
not greater than 15%
DC：DC85V~265V，Ripple coefficient not greater than 5%
Digital system operating voltage：+5V，Allowable deviation：±0.15V
Operating voltage of relay circuit：+24V，Allowable deviation：±2V
Power waste：
AC voltage circuit：Un = 57.7V，Each phase is not greater than 0.5VA
AC current circuit：In = 5A，Each phase is not greater than 1VA
In = 1A，Each phase is not greater than 0.5VA
In = 0.3A，Each phase is not greater than 0.5VA
DC power circuit：During normal operation，not greater than 15W
During protection action，not greater than 25W
Overload capacity of protection circuit：

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AC voltage circuit：1.2 times rated voltage, continuous operation
AC current circuit：2 times rated current, continuous operation
10 times rated power supply, 10s allowed
40 times rated power supply, 1s allowed
DC power circuit：80 ～115% rated voltage，continuous operation
After the device is subjected to the above overload current / voltage, the insulation
performance will not decline.
2.3 Main technical indicators
Setting accuracy
Current setting error：≤±5%
Frequency setting error：≤±0.01Hz
When the excitation amount is ≥1.2 times the fixed value, the action time of the
instantaneous action section：≤35ms
Discrete error of action time in delayed action section：≤30ms
Return time of each protection section：≤25ms
Remote measurement metering level
current、voltage：Class 0.2
frequency：±0.01Hz
other：Class 0.5
Remote signaling quantity
Remote signaling resolution：less than 1ms
working voltage：DC220V/DC24V； （ DC220V shall be indicated when ordering, and
the default is DC24V ）
Input mode：Active contact or passive contact； （ The default is passive contact ）
Relay output
Output mode：Passive contact；
Impact overcurrent capacity：6A@3s；15[email protected]；[email protected] ；
Action time：<8ms；
Return time：<5ms；
Electromagnetic compatibility
Electrostatic discharge：comply with GB / t14598.14-1998 Level 3
Radiated electromagnetic field interference：comply with GB/T14598.9-2002 Level 3
Fast transient interference：comply with GB/T14598.10-2007 Level B
1MHz burst interference：comply with GB/T14598.13-2008 Level 3
Surge immunity：comply with GB/T14598.18-2001 Level 3
Insulation test
The insulation, withstand voltage, damp heat resistance, vibration resistance, impact
resistance and collision resistance of the device shall comply with relevant international standards
of GB / t7261-2000 (insulation ≥20m Ω).

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3 Protection menu description
3.1 Protection on / off menu
Number
Code
Protection Name
Setting Type
Explain of
Protection Name
01
RLP01
Differential quick break
ON /OFF
02
RLP02
Ratio differential
ON /OFF
03
RLP03
Differential current out of limit
alarm
ON /OFF
04
RLP04
CT disconnection
ON /OFF
05
RLP05
CT disconnection locking
differential
ON /OFF
Blocking ratio
differential
06
RLP06
Quick break
ON /OFF
07
RLP07
Time limited quick break
ON /OFF
Open this function
after the motor is
started.
08
RLP08
Overcurrent
ON /OFF
Open this function
after the motor is
started.
09
RLP09
Low voltage blocking overcurrent
ON /OFF
10
RLP10
Overcurrent inverse time
General/Very
/Extreme/
Exit
Open this function
after the motor is
started.
11
RLP11
Overload
Alarm/Trip
/Exit
Open this function
after the motor is
started.
12
RLP12
Blocking protection
ON /OFF
Open this function
after the motor is
started.
13
RLP13
Negative sequence overcurrent
protection I
ON /OFF
14
RLP14
Negative sequence overcurrent
protection II
ON /OFF
15
RLP15
Inverse time limit of negative
sequence section II
General/Very
/Extreme/
Exit
16
RLP16
Zero sequence overcurrent
Alarm/Trip
/Exit
17
RLP17
Overheat Alarm
ON /OFF
18
RLP18
Overheat Trip
ON /OFF
19
RLP19
Over frequency
ON /OFF
20
RLP20
Under frequency unloading
ON /OFF
21
RLP21
Over Voltage
ON /OFF

10
22
RLP22
Under Voltage
Alarm/Trip
/Exit
23
RLP23
PT disconnection
ON /OFF
24
RLP24
PT voltage loss
ON /OFF
25
RLP25
Temperature rise
ON /OFF
26
RLP26
The temperature is too high
ON /OFF
27
RLP27
Electrical accident
Alarm/Trip
/Exit
28
RLP28
System power loss protection
Alarm/Trip
/Exit
29
RLP29
Control loop disconnection
ON /OFF
Change Password：1000
3.2 Protection setting menu
Number
Code
Setting Value
name
Range of
Value
Setting Value Description
00
Number of fixed
value sets
1~3
1
01
Kv1
PT Ratio/10
0.01~300.00
PT transformation ratio / 10,
input voltage level value (unit:
kV)
02
Ki1
CT Ratio/10
0.01~300.00
CT transformation ratio / 10，If
the CT transformation ratio is
200 / 5, it is set to 4
03
Kijd
Terminal CT
transformation
ratio
0.01~300
The default value is 1. According
to the actual transformation
ratio setting, if the CT
transformation ratio at the
machine end and tail is
inconsistent, it needs to be
converted when calculating the
difference flow.
04
Kijw
Tail CT
transformation
ratio
0.01~300
05
Icddz
Differential
speed
determination
value
0.01~100A
06
Icdqd
Differential
current
starting value
0.1~100 A
Starting current threshold
07
Igd
Inflection
point value
0.1~100A

11
08
Kb1
Ratio
differential
braking
coefficient
0.1~0.9
General setting: 0.5
09
Ictdx
CT
disconnection
value
0.1~100A
10
Tctdx
CT
disconnection
delay
0~100s
11
Tqd
Motor start time
0~300s
12
Ie
Rated current of
motor
0.1~10A
13
Idz0
Quick break
value
0.1~100A
14
Idz1
Time limited
quick break
value
0.1~100A
15
Tzd1
Time limited
quick break
delay
0~100s
16
Idz2
Overcurrent
value
0.1~100A
17
Tzd2
Overcurrent
delay
0~100s
18
Ubsqd
Low voltage
blocking
overcurrent
value
1~400V
19
Idz3
Overload value
0.1~100A
20
Tzd3
Overload delay
0~100s
21
Idz4
Locked rotor
current value
0.1~100A
22
Tzd4
Locked rotor
current delay
0~100s
23
I2dz1
Negative
sequence
overcurrent I
value
0.1~100A
24
T2zd1
Negative
sequence
overcurrent I
delay
0~100s

12
25
I2dz2
Negative
sequence
overcurrent II
value
0.1~100A
26
T2zd2
Negative
sequence
overcurrent II
delay
0~100s
27
I0dz1
zero sequence
current value
0.01~100A
28
T0zd1
zero sequence
current delay
0~100s
29
K2
Negative
sequence
current heating
coefficient
2~10
30
Heat
Heating time
constant
0~100
31
Cool
Heat
dissipation
time constant
1~5
32
GRBJ
Overheat alarm
level
0.3~1
33
Fdz1
Frequency too
high value
35Hz~64.99Hz
34
Tfzd1
Frequency too
high delay
0~100s
35
Fdz2
Low frequency
load shedding
value
35Hz~64.99Hz
36
Tfzd2
Low frequency
load shedding
delay
0~100s
37
Udz1
Overvoltage
value
50~600V
38
Tuzd1
Overvoltage
delay
0~100s
39
Udz2
Low voltage
value
30~400V
40
Tuzd2
Low voltage
delay
0~100s
41
Upt1
PT
disconnection
value
10~400V

13
42
Tupt1
PT
disconnection
delay
0~100s
43
Upt2
PT voltage
loss value
0.1~160V
High voltage system：0.1~90V
44
Tupt2
PT voltage
loss delay
0~100s
45
Tkzdx
Control loop
disconnection
delay
0~100s
Change Password：1000
4 Protection Principle
If the CT of the end side and tail side of the motor are inconsistent, we also
need to normalize the current before calculating the differential current. When
processing, refer to the high side current as the reference, and the low side current
is converted as follows: (take phase A as an example)
ia2’=ia2*Kijw/Kijd
Where ia2 is the secondary value of tail current directly collected by the
protection device, and ia2 'is the actual current value after tail current
normalization;
Kijd and kijw are the CT transformation ratios set at the machine end and tail
side respectively; If the CT transformation ratio on both sides is the same, kijw
/ kijd = 1.
Note: whether the protection current is taken from the machine end or the tail can
be set in the last bit of system Set1 in the factory setting (see the device instructions for
setting). It is taken from the machine end by default when leaving the factory.
Idx
Icddz
Icdqd Kb1
Igd Izx
Ratio zone
Differential
quick break zone
4.1 Judgment of motor startup and shutdown
1. Motor starting conditions
When one of the three-phase protection currents is greater than 0.2 times the rated current ie of the

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motor, the device starts timing and displays "motor start....." on the device. When the timing time
is greater than the motor start time TQD, set the start completion flag, display the "m" icon in the
upper right corner of the LCD, and open the time limit quick break, overcurrent, overcurrent
inverse time limit, overload and locked rotor protection.
2. The judgment condition for motor shutdown is
①The opening of the circuit breaker is R1 = 0 and R2 = 1.
②The three-phase protection current is less than 0.1*Ie
As long as any of the above conditions is met, the device judges that the motor state is shutdown,
and the "m" icon displayed on the LCD disappears.
4.2 Differential quick break
1．RLP01 Differential quick break－“ON”；
2．Any phase of differential current（Ida、Idb、Idc）≧ Differential quick break value（Icddz）；
Ida=|ia1+ia2*Kijw/Kijd|，Idb=|ib1+ib2*Kijw/Kijd|，Idc=|ic1+ic2*Kijw/Kijd| —Vector
calculation
If the above conditions are met, the protection immediately exports 3j (C7 / C8), 4J (C9 /
C10), 5J (C11 / C12), and drives the accident signal relay 11j (C1 / C3) (the relay does not return
until manual reset), and the panel accident light is on. The return value of differential quick break
is 9 / 10 of the determined value of differential quick break. The logic block diagram of action is
shown in 4-1:
Differential quick break--ON
IdaDifferential quick break value
IdbDifferential quick break value
IdcDifferential quick break value
1
&
LCD display
Emergency signal outlet
Trip outlet
Figure 4-1: action logic diagram of differential quick break protection
4.3 Ratio differential
1．RLP02 Ratio differential－“ON”；
2．The action criterion is：
When the braking current Izx is less than the inflection point current Igd, Idx>Icdqd；
When the braking current Izx is greater than or equal to the inflection point current Igd,
Idx-Icdqd>(Izx-Igd)*Kb1；
Among them：x=a，b，c
Ida=|ia1+ia2*Kijw/Kijd|，Idb=|ib1+ib2*Kijw/Kijd|，Idc=|ic1+ic2*Kijw/Kijd|—Vector
calculation
Iza=|ia1-ia2*Kijw/Kijd|/2，Izb=|ib1-ib2*Kijw/Kijd|/2，Izc=|ic1-ic2*Kijw/Kijd|/2——Vector
calculation
Kb1 is the ratio braking coefficient；
Idx is the differential current of phase a or phase B or phase C；
Izx is the braking current of phase a or phase B or phase C；
3．If RLP05 CT disconnection locking ratio differential is input, it is required that CT has no
instantaneous disconnection；
4．Differential quick break does not act；
If the above conditions are met, the protection immediately exports 3j (C7 / C8), 4J (C9 /

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C10), 5J (C11 / C12), and drives the accident signal relay 11j (C1 / C3) (the relay does not return
until manual reset), and the panel accident light is on. Return condition of ratio differential:
differential current < 9 / 10 of the starting setting value of differential current. The logic block
diagram of the action is shown in 4-2:
Instantaneous CT disconnection judgment conditions：
If one of the following three conditions is met, the instantaneous CT disconnection judgment will
not be carried out:
1．The maximum phase current before startup is less than 0.2Ie
2．The maximum phase after startup is greater than 1.2Ie
3．The current on either side after startup is higher than that before startup
If the following two conditions are met at the same time, it is judged as instantaneous
disconnection：
1．One phase or two-phase current is less than 0.3A
2．The current of other two phases or one phase is consistent with that before startup
CT disconnection locking differential：
1．RLP05 CT disconnection locking differential－“ON”；
2．Simultaneous input “Ratio differential”；
After the above conditions are met, the ratio differential protection will be locked in case of
instantaneous CT disconnection.
Ratio differential--ON
1
&TCT disconnection
delay
Ida＞Icdqd
IzaIgd
&
LCD display
Emergency signal outlet
Trip outlet
Differential quick
break no occur
Iza＞Igd
(Ida-Icdqd)(Iza-
Igd)*Kb1
&
1
Idb＞Icdqd
IzbIgd
&
Izb＞Igd
(Idb-Icdqd)(Izb-
Igd)*Kb1
&
1
Idc＞Icdqd
IzcIgd
&
Izc＞Igd
(Idc-Icdqd)(Izc-
Igd)*Kb1
&
1
CT disconnection locking
differential--OFF
CT disconnection locking
differential--ON
CT disconnection no occur
&
1
Figure 4-2：Operation logic diagram of ratio differential protection
4.4 Differential current over-limit alarm
1．RLP03 Differential current over-limit alarm－“ON”；
2．Differential current Idx > Icdqd/2 (x=a，b，c)；
3．Differential quick break, the ratio differential does not act；

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4．Duration of meeting the above conditions ≧10S；
When the above conditions are met, the device reports an over-limit alarm of the error
current, and drives the alarm signal relay 12J (C2/C3) (the relay does not return until manual
reset), and the panel alarm light is on. The logic block diagram of the action is shown in 4-3：
Differential current Over-
limit--ON
IdaIcdqd/2
IdbIcdqd/2
IdcIcdqd/2
1
&
T10s
Differential quick
break no act
Ratio differential
no act
LCD display
Alarm signal outlet
Figure 4-3: Action logic diagram of differential current over-limit protection
4.5 CT disconnection
1．RLP04 CT disconnection－“ON”；
2．Terminal current（ia1、ib1、ic1）maximum phase current >CT disconnection value（Ictdx），
Simultaneous minimum phase current <0.2A；Or tail current（ia2、ib2、ic2）maximum phase
current >CT disconnection value（Ictdx）， Simultaneous minimum phase current <0.2A；
3．The current does not increase after starting and the maximum current <6A；
4．Duration of meeting the above conditions ≧CT disconnection delay（Tctdx）；
When the above conditions are met, the device reports a CT disconnection alarm, and drives
the alarm signal relay 12J (C2/C3) (the relay does not return until manual reset), and the panel
alarm light is on. The logical block diagram of the action is shown in 4-4:
CT disconnection--ON
1&
TCT disconnection
delay
LCD display
Alarm signal outlet
Max(ia1.ib1.ic1)＞CT
disconnection value
Min(ia1.ib1.ic1)＜0.2A
Max(ia2.ib2.ic2)＞CT
disconnection value
Min(ia2.ib2.ic2)＜0.2A
The current does not increase
after the motor is started
MAX(ia1.ib1.ic1.ia2.ib2
ic2)< 6A
&
&
Figure 4-4: CT disconnection protection action logic diagram
Note: It can be judged that a CT disconnection occurs during 2CT.
4.6 Quick break
1．RLP06 Quick break－“ON”；
2．Protection current ia、ib、ic any phase ≧Quick break value（Idz0）；
Meet the above conditions, the protection immediately exports 3J (C7/C8), 4J (C9/C10), 5J

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(C11/C12), and drives the accident signal relay 11J (C1/C3) at the same time (the relay will not
return until manual reset), LCD The alarm information is displayed, and the panel accident light is
on. The logical block diagram of the action is shown in 4-5:
Quick break--ON
iaquick break value
ibquick break value
icquick break value
1
&
LCD display
Emergency signal outlet
Trip outlet
Figure 4-5: Logic diagram of quick-break protection action
4.7 Time-limited quick break
1．RLP07 Time-limited quick break－“ON”；
2．Protection current ia、ib、ic any phase ≧Time-limited quick break value（Idz1）；
3．The motor has been started；
4．Duration of meeting the above conditions ≧Time-limited quick break value（Tzd1）；
Meet the above conditions, the protection immediately exports 3J (C7/C8), 4J (C9/C10), 5J
(C11/C12), and drives the accident signal relay 11J (C1/C3) at the same time (the relay will not
return until manual reset), LCD The alarm information is displayed, and the panel accident light is
on. The logical block diagram of the action is shown in 4-6:
Time-limited
quick break--ON
iaTime-limited
quick break value
ibTime-limited
quick break value
icTime-limited
quick break value
1
&
LCD display
Emergency signal outlet
Trip outlet
TTime-limited
quick break
delay
Figure 4-6: Action logic diagram of time-limited quick-break protection
4.8 Overcurrent
1．RLP08 Overcurrent－“ON”；
2．Protection current ia、ib、ic any phase ≧Overcurrent value（Idz2）；
3．The motor has been started；
4．Duration of meeting the above conditions ≧Overcurrent value（Tzd2）；
Meet the above conditions, the protection immediately exports 3J (C7/C8), 4J (C9/C10), 5J
(C11/C12), and drives the accident signal relay 11J (C1/C3) at the same time (the relay will not
return until manual reset), LCD The alarm information is displayed, and the panel accident light is
on. The logical block diagram of the action is shown in 4-7:
Overcurrent--ON
iaovercurrent value
ibovercurrent value
icovercurrent value
1
&
LCD display
Emergency signal outlet
Trip outlet
TOvercurrent
delay
Figure 4-7: Logic diagram of over-current protection action

18
4.9 Overcurrent inverse time limit
The device provides three inverse time characteristics (according to the IEC225-4 standard)：
1）General inverse time limit：
 
0.02 1
0.14
I Ip
t Tp


2）Very inverse time limit：
 
1
13.5
I Ip
t Tp


3）Extreme inverse time limit：
 
21
80
I Ip
t Tp


In the above formula, Ip is the current inverse time limit current value, and tp is the current
inverse time limit time value.
Note: The overcurrent inverse time protection uses the overcurrent protection setting and
the overcurrent delay. When the overcurrent inverse time protection and the overcurrent are
turned on at the same time, the inverse time protection is invalid.
The action logic block diagram is shown in Figure 4-8：
Overcurrent--ON
Overcurrent
inverse time
limit--General
Overcurrent
inverse time
limit--Very
Overcurrent
inverse time
limit--Extreme
1
&
LCD display
Emergency signal outlet
Trip outlet
TInverse time
limit delay
iaovercurrent value
ibovercurrent value
icovercurrent value
1
&
Motor start complete
Figure 4-8: Over-current inverse time action logic diagram
4.10 Low voltage blocking over current protection
Low-voltage components take the voltage components in the following table as the criterion.
If one of the two line voltages is lower than the fixed value, the current protection will be opened;
the use of low-voltage components can ensure that the device is in non-fault conditions such as
reverse charging of the motor There is no malfunction under the condition of 90°low-voltage
component voltage and the corresponding relationship between phases as shown in 4-9:

19
Phase voltage
Line voltage
PhaseA
Uab、Uca
Phase B
Ubc、Uab
Phase C
Uca、Ubc
Explain：
If you cast "PT disconnection", when the PT disconnection occurs, the low voltage does not
block the current protection.
If “PT loss of voltage” is selected, when PT loss of voltage occurs, the low voltage does not
block the current protection.
Taking the over-current A phase criterion as an example, the logic diagram of the protection is
drawn as shown in 4-10：
&
LCD display
Emergency signal outlet
Trip outlet
Tovercurrent
delay
PT voltage loss--ON
PT voltage loss occur
1
&
Overcurrent--ON
iaovercurrent value
Low voltage lockout
overcurrent--ON
Uab< Low voltage
lockout overcurrent
value
Uca< Low voltage
lockout overcurrent
value
1
1
&
PT disconnection--ON
PT disconnection occur
&
1
1
Figure 4-10: Logic diagram of phaseA of low voltage blocking overcurrent
4.11 Overload
1．RLP11 Overload－“alarm/trip”；
2．Protection current ia、ib、ic any phase ≧Overload value（Idz4）；
3．The motor has been started；
4．Duration of meeting the above conditions ≧Overload delay（Tzd4）；
If the above conditions are met, if the "trip" protection is turned on, immediately export 3J
(C7/C8), 4J (C9/C10), 5J (C11/C12), and drive the accident signal relay 11J (C1/C3) at the same
time (until manual reset, the relay Only return), the liquid crystal displays the action information,
the panel accident light is on; if the "alarm" protection is turned on, the alarm signal relay 12J
(C2/C3) is driven (until the manual reset, the relay does not return), the liquid crystal display
reports the action information, and the panel warning light is on . The logical block diagram of the
action is shown in 4-11:

20
Overload--trip
iaoverload value
iboverload value
icoverload value
1
&
LCD display
Emergency signal outlet
Trip outlet
Toverload
delay
Overload--alarm
Motor start complete &Toverload
delay
LCD display
Alarm signal outlet
Figure 4-11: Logic diagram of overload protection action
4.12 Locked-rotor protection
1．RLP12 Locked-rotor protection－“ON”；
2．Positive sequence current i1 ≧Locked-rotor protection value（Idz4）；
3．Motor start completed；
4．Duration of meeting the above conditions ≧Locked-rotor protection delay（Tzd4）；
If the above conditions are met, the protection immediately exports 3J (C7/C8), 4J (C9/C10),
5J (C11/C12), and drives the accident signal relay 11J (C1/C3) (until manual reset, the relay will
not return), the panel The accident light is on. The logical block diagram of the action is shown in
4-12:
Locked-rotor protection--ON
i1Locked-rotor current value &
LCD display
Emergency signal outlet
Trip outlet
TLocked-rotor
delay
Motor start complete
Figure 4-12: Blocked-rotor protection action logic diagram
4.13 Negative sequence overcurrent section I
1．RLP13 Negative sequence overcurrent section I－“ON”；
2．Negative sequence current i2≧Negative sequence overcurrent section I value（I2dz1）；
3．Duration of meeting the above conditions ≧Negative sequence overcurrent section I delay
（T2zd1）
If the above conditions are met, the protection immediately exports 3J (C7/C8), 4J (C9/C10),
5J (C11/C12), and drives the accident signal relay 11J (C1/C3) (until manual reset, the relay will
not return), the panel The accident light is on. The logical block diagram of the action is shown in
4-13:
Negative sequence
overcurrent section I--ON
i2Negative sequence
overcurrent section I value
&
LCD display
Emergency signal outlet
Trip outlet
TNegative sequence
overcurrent section I
delay
Figure 4-13: Logic diagram of negative sequence overcurrent section I protection action
4.14 Negative sequence overcurrent section II
1．RLP14 Negative sequence overcurrent section III－“alarm/trip”；