Huazheng HZ7411 User manual

HZ7411
Circuit Breaker Dynamic
Characteristic Tester
User Manual
Huazheng Electric Manufacturing (Baoding) Co., Ltd

Contents
I Product technical parameters........................................................................................................................ 1
1.1 Use environment......................................................................................................................................1
1.2 Safety performance................................................................................................................................. 1
1.3 Basic parameters.....................................................................................................................................1
1.3.1 Time........................................................................................................................................................1
1.3.2 Speed..................................................................................................................................................... 1
1.3.3 Current................................................................................................................................................... 1
1.3.4 Closing resistance................................................................................................................................1
1.3.5 Output Power........................................................................................................................................ 1
1.3.6 Stroke..................................................................................................................................................... 1
II Performance.................................................................................................................................................... 2
2.1 Time........................................................................................................................................................... 2
2.2 Speed and stroke.....................................................................................................................................2
2.3 Speed and stroke.....................................................................................................................................2
2.4 Current and voltage.................................................................................................................................2
2.5 Closing resistance................................................................................................................................... 2
III Term definitions..............................................................................................................................................2
IV Panel layout....................................................................................................................................................4
V Menu operation instructions..........................................................................................................................5
5.1 Data test.................................................................................................................................................... 5
5.1.1 General test mode................................................................................................................................6
5.1.2 Manual opening and closing.............................................................................................................10
5.1.3 Low voltage test..................................................................................................................................10
VI Data query.................................................................................................................................................... 11
VII Other settings..............................................................................................................................................11
VIII Field connection........................................................................................................................................ 12
8.1 Ground and port connections.............................................................................................................. 12
8.2 Control line connection......................................................................................................................... 13

8.3 Sensor connection.................................................................................................................................14
IX On-site common problems.........................................................................................................................15
8.4 On-site closing and opening control wiring is incorrect or there is a problem in the control loop15
9.2 The instrument prompts "Power supply current output exceeds limit, over-current protection
action".............................................................................................................................................................15
9.3 The instrument has no DC power output........................................................................................... 16

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I Product technical parameters
1.1 Use environment
Input power：220V±10%，50Hz±10%
Atmospheric pressure：86～106kpa
Temperature:：－10～40℃
Humidity：≦80%RH
1.2 Safety performance
Insulation resistance：＞2MΩ
Dielectric strength: the power supply withstands the power frequency of the cabinet at 1.5KV for 1 minute,
no flashover and flashover
1.3 Basic parameters
1.3.1 Time
When the range is selected from 250-4000ms, the resolution is 0.1ms and the error is 0.1ms ± 1 word;
when the range is 10000-20000ms, the resolution is 1ms and the error is 1ms ± 1 word.
1.3.2 Speed
Range is 20.00m / s, resolution is 0.001m / s, error: ± 0.01m / s ± 1 word
1.3.3 Current
The range is 10A (20A), the resolution is 0.01A, and the error is 1% ± 0.1A.
1.3.4 Closing resistance
The range is 50-2000Ω, the resolution is 0.1Ω, and the error is% 1 ± 1Ω.
1.3.5 Output Power
DC5 ～270V digital adjustable 10A (20A) (instantaneous operation).
1.3.6 Stroke
Switch type
Range（mm）
Resolution（mm）
Error
Vacuum circuit breaker
50
0.1
1%±1 word
SF6 circuit breaker
300
Less oil circuit breaker
1000
Table 1

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II Performance
2.1 Time
The machine can measure the natural parting and closing time of 12 metal fractures, the same period
time, the same period time, the same period time, the gold short time, the no flow time, the closing spring
time of the process of closing - parting, dividing - parting and dividing - dividing; Some models can
measure the pre-casting time of closing resistance.
2.2 Speed and stroke
This tester can record and measure the closing bounce time, the number of bounces, the bounce
process, and the bounce waveform of each fracture.
2.3 Speed and stroke
This tester can record and calculate the rigid points, rigidity, maximum speed, average speed, total
travel, opening distance, over travel, rebound amplitude, time-travel characteristic curve.
2.4 Current and voltage
This tester can record the opening / closing current value and current waveform of the opening /
closing coil, and provides DC5 ～270V / 10A (20A) digital adjustable circuit breaker operation power
supply, automatically completes the low voltage operation test of the circuit breaker, and measures the
open circuit. The operating voltage of the device.
2.5 Closing resistance
Some models of this machine can measure 6-way closing resistance value and its pre-throw time at
the same time.
III Term definitions
♦ Opening / closing time: When the opening / closing coil is powered on as the timing starting point, the
time to the opening / closing of the moving and static contacts.
♦ In the same period: Among the same phase, the difference between the maximum and minimum
opening / closing time.
♦ Phase-to-phase synchronization: The difference between the maximum and minimum opening / closing
time among three phases.
♦ Average speed: During the opening (closing) process, remove the front and back of the moving contact
by 10%, take the middle 80%, the ratio of the travel of the moving contact to time.

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♦ Maximum speed: During the opening (closing) process, after the moving contact starts to move, the
moving contact movement is taken as a speed measurement unit every 10ms until the moving contact
movement stops, and several speed unit values are obtained. The speed value is the maximum speed
of opening (closing).
♦ Rigid opening / closing speed: According to the manufacturer of the switch to be tested, the switch
model is different, and each manufacturer defines different rigid opening and closing speeds. This
tester includes various different definitions in it. User chooses (as shown in the table below)
No.
Speed definition
Applicable circuit breaker model
1
10ms after opening before closing
Certain oil switches and SF6 circuit breakers
2
5ms each after opening before
closing
Certain oil switches
3
10ms each after opening before
closing
4
6mm before closing and after
opening
Some 10kv vacuum circuit breakers
5
Speed before closing, 6mm after
opening
6
12mm before closing and after
opening
Some 35kv vacuum circuit breakers
7
16mm before closing, 32mm after
opening
LW8-35 type SF6 circuit breaker
8
36mm before closing, 72mm after
opening
LW6 type SF6 circuit breaker
9
120mm before closing and after
opening
LW7 type SF6 circuit breaker
10
10% to fracture
SF6 circuit breakers in some Xi'an switch
factories
Table 2
If none of the above definitions meet the current speed definition of the short circuit being tested, the

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user can select the "Custom" option in the parameter setting interface-speed definition option, enter and
save a speed definition that conforms to the rules. Alternatively, you can also choose a closer speed
definition to measure, and then manually cut out the required rigid opening / closing speed (ratio of travel
to time in the sampling section) in the time-stroke characteristic curve in the measurement result.
IV Panel layout
Figure 1
No.
Panel logo
Function Description
①
socket
Instrument AC220V working power switch and socket
②
switch
③
Close
Internal DC power closing output
④
Open
Internal DC power trip output
⑤
Com
Internal DC power output common terminal
⑥
Energy
Short-term energy storage power supply for the energy storage
motor of the circuit breaker under test
⑦
A1B1C1N
12 channels on / off time measurement channel
⑧
A2B2C2N
⑨
A3B3C3N
⑩
A4B4C4N

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⑪
Sensor
Motion sensor signal channel
⑫
Ext
External trigger signal channel
⑬
Grounding post
⑭
Com
USB communication port
⑮
U-Disk
USB storage port
⑯
printer
⑰
LCD screen
Table 3
V Menu operation instructions
The LCD screen of this machine is a 1024 * 600 pixel resistive touch color screen. After booting,
the LCD screen enters the home menu interface after playing the boot animation. There are 6 function
area buttons on the homepage, which are "Data measurement", "File management", "Brightness
adjustment", "Time calibration", "System settings", and "Serial communication" Click the buttons to enter
the corresponding operation interface.
Figure 2
5.1 Data test
The data measurement interface is divided into upper, middle, and lower 3 areas (see Figure 3).
The upper display area of the screen displays the current closing and opening status of the 12-way
fracture in real time. The opening and closing of the fracture is displayed in red and the opening is
displayed in green.

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The middle part of the screen is the test mode selection area, providing a total of 8 test modes,
which are "Auto Test", "Open Test", "Close Test", "Manual Open and Close", "Open and Close Test", and
"Open and Close Test". "," Open and close, "and" low-voltage test. " In the automatic test mode, the
instrument automatically selects the opening test or the closing test according to the current port status
(the opening test is performed when 1 of the 12-way break is closed). In the low-voltage test mode, the
instrument automatically judges whether the low trip or low trip occurs according to the current status of
each fracture (the low trip is performed when one of the 12 fractures is closed). The user can select the
corresponding test mode according to the test requirements and the current fracture state. After clicking
the mode button, it will automatically jump to the corresponding operation interface.
Figure 3
At the bottom of the screen is a page-turning button area, which has three buttons: "Back to Home",
"Parameter Setting" and "Motor Energy Storage". Click the button to jump to the corresponding operation
interface.
After clicking the "Parameter Setting" or "Test Mode" button, the screen jumps to the corresponding
test mode interface.
5.1.1 General test mode
When the selected test mode is one of "Auto test", "Open test", "Close test", "Open and close test",
"Close and open test" and "Open and close", the page jumps The following interface (Figure 4)

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Figure 4
The operation interface is also divided into three areas: the fracture status display area in the upper
part, the parameter setting area in the middle part, and the page turning button area in the lower part. The
functions of the upper and lower areas are similar to the mode selection interface and will not be
described again. It mainly introduces the selection and setting of each parameter in the central parameter
setting area.
♦ Switch type: Some models of this machine support the selection of combined resistance contact
and metal contact mode. The default is metal contact.
♦ Trigger mode: The trigger mode is divided into two working modes: internal trigger and external
trigger. The internal trigger mode is to use the internal DC power of the instrument to drive the on / off coil
of the device under test. In the external trigger mode, the internal DC source of the instrument does not
work, but the on / off coil of the device under test is driven by the on-site power. The external
voltage action signal is used as the timing starting point. This parameter can only be selected in "Auto
test", "Open test" and "Close test" modes, and the default is "Internal trigger" in other modes.
♦ Speed definition: This parameter is used to define the calculation rules of rigid opening / closing speed
to meet the different requirements of different switch manufacturers and models. This
machine has built-in 10 common speed definition modes and a custom mode that can be
saved in case of power failure. If the above method still can't find a satisfactory speed

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definition, you can first select the "10ms before closing" mode, measure the "time-travel
characteristic curve", and then perform corresponding analysis on the curve to obtain the
corresponding speed value.
♦ Output voltage: Set the output operating voltage value according to the needs of the field (it is invalid to
set this item in external trigger mode).
♦ Sensor: The sensor needs to set three parameters: type, quantity and position. Types include
displacement and angle; the number defaults to 1 (some models can be set to 3); the position is the
sensor installation position. If it is a displacement sensor, set it to "A phase", " "B-phase" or "C-phase", if it
is an angle sensor, the default setting is A-phase.
♦ Switch stroke: Enter the total stroke value of the switch when using the angle sensor; enter the marked
stroke value of the sensor when using the angle sensor.
♦ Test time: The total test time is the time of the internal DC power output voltage. This time should meet a.
When doing a single opening and closing test, it should meet the inherent opening and closing time of the
device under test; b. When doing a re-closing test, it should meet the inherent opening and closing time
that is greater than the multiple actions of the device under test Sum of time.
♦ Reclosing time: This item needs to be set during reclosing test. The reclosing and closing time is
counted as T closing and closing, and the reclosing and closing time is counted as T closing and closing.
T opening and closing is the period of time from powering on the opening coil to powering on the closing
coil. T closing is the period of time from powering on the closing coil to powering on the opening coil.
Open—Topen-close—Close—Tclose-open—Open
When you select the "close-to-open" test mode in the mode selection interface, the "General Mode"
and "Special Mode" options will pop up on the right. The above-mentioned reclosing time can optionally
be performed in the normal mode. If special mode is selected, the time parameters Topen-close and Tclose-open
will be automatically set to 0ms and cannot be changed. Because the working mode at this time is that
when any one of the 12 groups of ports detects a closing signal during the closing process, it immediately
stops the closing command and opens the opening command until the test time is reached.

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Figure 5
After setting the test parameters, click the "Start Test" button to perform the test. After the test is
completed, enter the data interface (see Figure 6). The parameters shown in the figure are the
parameters before the test. Enter the corresponding interface by selecting the button in the upper right
corner of the figure. For example, the "test data" interface contains all the test result data, and the
"graphic analysis" contains the dynamic graphics and current and displacement curves of each port. In
the “Storage and Print” interface, operations such as transferring to a USB flash drive, printing data, and
deleting data can be performed.
Figure 6

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5.1.2 Manual opening and closing
Select the "Manual Open / Close" test mode, the screen will switch to the "Start Test" interface in this
mode, press the "Input Voltage" button and enter the corresponding voltage value and confirm, and select
"Close" according to the switch status analog indicator. Or "open" button to operate (Figure 7).
Figure 7
Figure 8
5.1.3 Low voltage test
If you select the “Open / Close Low Jump” test mode, the screen will switch to the “Start Test”
interface in this mode, and set the “Control Pulse Width” (that is, the coil power-on time), “Initial Voltage”,
and “Step Voltage” in this order. ", Select" Single "or" Continuous "mode for boost operation. The use of
this function is that the instrument automatically determines whether it is closed or opened according to

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the port status (see Figure 8).
VI Data query
Click the "Data Query" button to enter the historical data viewing interface. This item is divided into
four parts: "test record", "test data", "graphic analysis" and "storage printing", which are basically the
same as the interface after the test is completed.
The "test record" contains the test result number, time, test product information, test personnel and
test parameters;
"Test data" includes the same period, three-phase synchronization, opening / closing time, rigid
opening / closing speed, maximum speed, average speed, opening distance, overtravel, total stroke, coil
current, coil resistance, and phase Information such as bounce time and number of bounces.
The "graphic analysis" includes the 12-way fracture bounce curve, the displacement curve of the
test fracture, and the coil current curve. And by selecting specific t1 and t2 values, the average speed in
the specified motion interval can be obtained. The specific operations are as follows:
In the initial state, the background of the value display areas of t1 and t2 are white. Clicking on any
one of the white areas will change the background color (the background color of t1 becomes pink and
the background color of t2 becomes light green) and the same color light will be displayed Ruler. At this
time, click the color change area again to manually enter the time (less than or equal to the test duration
value) or click anywhere on the display area of the bounce curve and displacement curve, and then move
the cursor ruler to select the specified time scale. During input or movement, t1 / t2, S1 / S2, I1 / I2, will
dynamically display the time, displacement value and coil current value of the cursor ruler, △t and △S will
dynamically display the time and displacement difference of the selected position ,Vis the average speed
in the time interval between t1 and t2. The calculation formula is::
△t=|t1-t2| Unit ms;
△S=|S1-S2| Unit mm;
V=△S/△t Unit m/s;
"Stored print" can optionally print test data or data or graphics in graphic analysis, and can save the
current data to a USB storage device, so that the data can be analyzed by supporting software on a PC.
VII Other settings
The “brightness adjustment” and “time calibration” in the main interface can be operated according to

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the interface prompts, and will not be repeated here. The “system settings” are the factory parameters of
the instrument, which cannot be set by non-production personnel.
VIII Field connection
8.1 Ground and port connections
This machine is equipped with a special grounding wire. Please connect the protective ground
of the instrument to the field ground before performing other wiring and operations. After the test,
turn off the power of the instrument, remove the other wires, and finally remove the ground wire. This
machine's fracture line is a four-core sheathed wire with four colors: yellow, green, red, and black, which
correspond to ABC and the public end, respectively. The connection method is shown below.

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8.2 Control line connection
This machine provides 3-core sheathed wires as internal power output conductors (red is the
closing conductor, green is the opening conductor, and black is the power common terminal) and 3-core
sheathed wires are used as external operating voltage acquisition leads.
When the switch-on and switch-off control power is provided by the instrument, disconnect the
control power in the switch control box under test (usually disconnect the fuse connected to the control
power in the control box and the control bus), but the power supply of the switch mechanism cannot be
cut , And then wire as shown below. The instrument can only provide DC current internally. Use the
instrument's internal power supply to “internal trigger”. If the on-site switch is an AC operating mechanism,
please use the "external trigger" method.

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When using an external field power supply for the opening and closing control, the "internal power
supply" is not wired. When the switch is single-tested, two wires “externally triggered” are connected to
both ends of the brake coil; when the switch is single-tested, the two wires “externally triggered” are
connected to both ends of the open-circuit coil. When operating with an external power supply, use the
"external trigger" method. External trigger mode can be tested regardless of whether the switching
mechanism is AC or DC.
8.3 Sensor connection
This machine provides two types of sensors: angle and displacement. Select the appropriate
sensor according to the measured switch. For some imported and joint-venture switches, the linear drive
part is enclosed inside the switch body. When the switch manufacturer leaves the factory for speed tests,
the switches are tested on the switch opening and closing indicators or rotary shafts. In this case, angle
sensors are used. The axis of the rotation sensor should be kept concentric with the axis of the switch as
much as possible, otherwise the rotation of the sensor will be hindered, and the burr of the measured
curve will be very heavy, which will affect the accuracy of the test data.
If you need to measure the stroke of the switch very accurately, you need a linear sensor. There are
three types of linear sensors: 50mm, 200mm and 300mm. 50mm linear sensor is used to measure the
travel speed of vacuum switch; 200mm, 300mm is used to measure the SF6 switch travel and speed
These two sensors are non-standard configurations. Take a certain type of vacuum switch as an example,
as shown below. When installing the linear resistance sensor, ensure that the sensor's moving axis can

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move in a straight line, and fix the sensor with a magnetic universal bracket. The method is similar for SF6
switch and oil switch.
IX On-site common problems
9.1 On-site closing and opening control wiring is incorrect or there is a problem in the control loop
Find the control wiring diagram of the on-site control cabinet and ask relevant professionals to find
the closing and opening coils and switch auxiliary contacts respectively. Refer to Appendix II of this
manual for control wiring diagrams and instructions for rewiring. Check the control circuit to ensure that
the circuit is unblocked.
9.2 The instrument prompts "Power supply current output exceeds limit, over-current
protection action"
a. It is possible that the output of the instrument is short-circuited due to the wrong control wiring, which
causes the short-circuit protection function to start, and the instrument "closes and opens the control
power" has no output. Shut down at this time, and check the wiring again according to the first item
above.
b. The instrument may not be driven normally due to the excessive coil load on site.
①For the switch of the electromagnetic mechanism, the driving current required by the switch closing
coil is large (up to 100A or several hundred amps), and the maximum load capacity of the instrument
operating power supply is 15A. As a result, the load is too large and the instrument cannot be driven
normally. Generally, the closing control line is connected to the closing contactor coil in front of the
closing coil, and the switch contactor is controlled by the instrument. The contactor is used to drive the
switch closing coil to make the switch act. "Trigger" mode operation switch closes.
②For the switch of hydraulic and spring mechanism, the default is “excessive load” when the output
current of the instrument is greater than 6A. Please take a look or use a multimeter to measure the

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resistance of the closing coil to confirm that the closing coil current is large. Then please check the
wiring carefully, make sure that the closing output is not short-circuited, and then restart after power off.
9.3 The instrument has no DC power output
This kind of situation may be caused by the burnout of the power supply insurance of the instrument
and the loss of power supply to the entire instrument. At this time, the replacement insurance can be
replaced. Or the internal power supply of the instrument has failed. At this time, external triggering can be
used for measurement. After the test is completed, notify the company to return to the factory for repair.