CN107688128A - Method of testing, device, computer-readable recording medium and the computer equipment of subway direct current protecting device - Google Patents
Method of testing, device, computer-readable recording medium and the computer equipment of subway direct current protecting device Download PDFInfo
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- CN107688128A CN107688128A CN201710724138.XA CN201710724138A CN107688128A CN 107688128 A CN107688128 A CN 107688128A CN 201710724138 A CN201710724138 A CN 201710724138A CN 107688128 A CN107688128 A CN 107688128A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
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Abstract
The present invention relates to a kind of method of testing, device, computer-readable recording medium and the computer equipment of subway direct current protecting device.Default test data is received first, parses default test data, is obtained the input signal of subway direct current protecting device and is sent to subway direct current protecting device；Receive the output action signal that subway direct current protecting device generates according to input signal；Then according to output action signal, the actuation time of subway direct current protecting device and the variable parameter of subway direct current protecting device are obtained；According to the actuation time of subway direct current protecting device and the variable parameter of subway direct current protecting device; obtain the protective value of subway direct current protecting device; whether the method for testing of such subway direct current protecting device acts without manually observation subway direct current protecting device; the automatic protective value for obtaining subway direct current protecting device, can effectively improve operating efficiency.
Description
Technical field
The present invention relates to track traffic power supply technique field, more particularly to a kind of test side of subway direct current protecting device
Method, device, computer-readable recording medium and computer equipment.
Background technology
Track traffic is the important directions of future city traffic system development, in the past 20 years, existing more than 20 city in China
Different degrees of rail transportation projects construction is carried out, according to statistics, it is contemplated that to the year two thousand twenty, China's rail line rule
Draw total kilometrage and be up to 6100 kilometers.
Subway DC Traction is a complicated system, and its security, reliability is by direct current supply control
System and protection device processed provide, to make tractive power supply system safely and reliably to train power supply, DC traction power-supply system
Protection has played important function.DC traction power-supply system includes direct-current switch cabinet, control and protection device, direct current cables, connect
Touch net etc., wherein, control and protection device have the function that to hold the balance to the safe and reliable operation of track traffic.
Characteristic test is carried out to subway direct current protecting device due to lacking corresponding special testing instrument, it is traditional to subway
The method that direct current protecting device carries out characteristic test is by millivolt generator input signal to subway direct current protecting device, interval
After certain time, artificial to observe whether subway direct current protecting device acts, operating efficiency is low.
The content of the invention
Based on this, it is necessary in view of the above-mentioned problems, providing a kind of subway direct current protecting device for improving operating efficiency
Method of testing, device, computer-readable recording medium and computer equipment.
A kind of method of testing of subway direct current protecting device, including step：
Default test data is received, parses default test data, obtains the input signal of subway direct current protecting device, and will
Input signal is sent to subway direct current protecting device；
The automatic output action signal for receiving subway direct current protecting device and being generated according to input signal；
According to output action signal, actuation time and the subway direct current protecting device of subway direct current protecting device are obtained
Variable parameter；
According to the actuation time of subway direct current protecting device and the variable parameter of subway direct current protecting device, subway is obtained
The protective value of direct current protecting device.
A kind of computer-readable recording medium, is stored thereon with computer program, and the program is realized when being executed by processor
The step of above method.
A kind of computer equipment, including memory, processor and storage can be run on a memory and on a processor
Computer program, the step of realizing the above method during computing device program.
Method of testing, computer-readable recording medium and the computer equipment of above-mentioned subway direct current protecting device, connect first
Default test data is received, parses default test data, the input signal of subway direct current protecting device is obtained and sends straight to subway
Flow protection device；The automatic output action signal for receiving subway direct current protecting device and being generated according to input signal；Then according to defeated
Go out action signal, obtain the actuation time of subway direct current protecting device and the variable parameter of subway direct current protecting device；According to
The actuation time of subway direct current protecting device and the variable parameter of subway direct current protecting device, obtain subway direct current protecting device
Protective value, whether the method for testing of such subway direct current protecting device move without manually observation subway direct current protecting device
Make, the automatic protective value for obtaining subway direct current protecting device, operating efficiency can be effectively improved.
A kind of test device of subway direct current protecting device, including：
Data resolution module, for receiving default test data, default test data is parsed, obtains subway direct current protecting dress
The input signal put, and input signal is sent to subway direct current protecting device；
Signal generation module, believe for receiving the output action that subway direct current protecting device generates according to input signal automatically
Number；
Parameter acquisition module, for according to output action signal, obtain subway direct current protecting device actuation time and
The variable parameter of subway direct current protecting device；
Performance estimation module, for the actuation time according to subway direct current protecting device and subway direct current protecting device
Variable parameter, obtain the protective value of subway direct current protecting device.
The test device of above-mentioned subway direct current protecting device, including data resolution module, signal generation module, parameter acquiring
Module and performance estimation module, data resolution module are used to receive default test data, parse default test data, obtain ground
The input signal of iron direct current protecting device is simultaneously sent to subway direct current protecting device；Signal generation module is used to receive subway automatically
The output action signal that direct current protecting device generates according to input signal；Parameter acquisition module is used for according to output action signal,
Obtain the actuation time of subway direct current protecting device and the variable parameter of subway direct current protecting device；Performance estimation module is used for
According to the actuation time of subway direct current protecting device and the variable parameter of subway direct current protecting device, subway direct current protecting is obtained
The protective value of device, the test device of such subway direct current protecting device are without manually observation subway direct current protecting device
No action, the automatic protective value for obtaining subway direct current protecting device, can effectively improve operating efficiency.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the method for testing of subway direct current protecting device in one embodiment；
Fig. 2 is the structural representation of subway direct current protecting device in one embodiment；
Fig. 3 is the structural representation of the test device of subway direct current protecting device in one embodiment.
Embodiment
For the objects, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with drawings and Examples, to this
Invention is described in further detail.
Feeding System of Urban Rail Transit is the power of urban track traffic operation, is responsible for the supply and transmission of electric energy, is
Power and lighting electricity consumption required for electric train traction power supply and offer station, section, rolling stock section, control centre etc..Wherein, lead
The function of drawing electric power system is that piezoelectricity pressure in exchange is become into direct current 1500V or direct current 750V voltages through step-down rectifier, is electronic
Train provides traction power supply.In DC traction power-supply system, the main parameters of protection have the detection of DC current, DC voltage
Detection, the detection of current changing rate, the detection of current increment, the detection of system impedance, can by the detection to these parameters
Whether to judge protection act, so as to realize the purpose of tractive power supply system relay protection.
As shown in figure 1, a kind of method of testing of subway direct current protecting device, including step：
S100, default test data is received, parse default test data, obtain the input letter of subway direct current protecting device
Number, and input signal is sent to subway direct current protecting device.
Default test data refers to subway direct current protecting device to test project, to the test event of subway direct current protecting device
Including direct current fast tripping protection, DC Curent Derivation and increment protection, DC overcurrent protection, DC minimum voltage protection,
Thermal overload protection and DC two-sided anti-interference protection.Direct current fast tripping protection is also referred to as high current dropout protection, refers to detect
When transient current exceedes action current, trip immediately, to avoid big short circuit current from causing huge damage to circuit；Direct current is short
Road current changing rate and increment protection can cut off near-end short circuit current, can also cut off the unresectable event of high current dropout protection
Hinder the less far-end fault of electric current；DC overcurrent protection is when the electric current by DC feeder breaker is in the time set in advance
Interior when exceeding advance setting current value, DC feeder circuit breaker trip is to cut off failure；When short trouble occurs, direct current output
Voltage declines much rapidly, and when output voltage is less than preset voltage value, DC minimum voltage protection sends action signal or alarm；
The auxiliary protection that thermal overload protection is protected as current changing rate, when DC line is in overload state, even if not having
Any short trouble occurs, and the temperature of Traction networks or inlet wire cable can also rise, when the temperature of measurement exceedes preset value, hot mistake
Load protection sends alarm or trip signal；DC two-sided anti-interference protection refers to that in case of a fault same feed area both sides are led
The feeder switch for drawing electric substation realizes two-sided anti-interference, it is ensured that adjacent traction substation reliable trip.The default test data of parsing, is obtained
Input signal and transmission to subway direct current protecting device, such as parsing to ground flowing molten iron protection device are obtained currently to subway direct current
The test event of protection device is direct-current short circuit rate of current rise protection, and as 4000A, no-load voltage ratio is the current increment △ I definite values set
4000A：60mV, preset duration 100ms, corresponding input signal is sent to subway direct current protecting device, such as input letter
Number gradually increase in the range of 3500A-4500A.
The system block diagram of subway direct current protecting device is as shown in Fig. 2 subway direct current protecting device includes Hall sensor, divided
Depressor (current divider), direct current isolated amplifier and CPU, Hall sensor can measure random waveform electric current and
Voltage, such as：Direct current, exchange, impulse waveform etc.；Direct current isolated amplifier is used for electrical isolation and electricity together with Hall sensor
Voltage measurement is flowed, CPU is the nucleus module of direct current protecting device, can complete various defencive functions, and can control
The trip protection of intelligent breaker processed.
S200, the automatic output action signal for receiving subway direct current protecting device and being generated according to input signal.
Subway direct current protecting device carries out relevant action according to the input signal received and generates output action signal, than
If test event is direct-current short circuit rate of current rise protection, subway direct current protecting device is received in the range of 3500A-4500A gradually
The input signal of increase, after preset duration 100ms, subway direct current protecting device generation output action signal.
S300, according to output action signal, obtain actuation time and the subway direct current protecting of subway direct current protecting device
The variable parameter of device.
Wherein, according to output action signal, obtaining the actuation time of subway direct current protecting device can include：
The time of action signal and the time of trip signal are obtained according to output action signal；
According to the time of action signal and the time of trip signal, the actuation time of subway direct current protecting device is obtained.
Actuation time is the time for sending action signal to subtract the time for sending trip signal, and variable parameter is specific electricity
The variable parameter such as pressure value or current value.For example test event is direct-current short circuit rate of current rise protection, subway direct current protecting device is given birth to
Into output action signal, the time of action signal and the time of trip signal are obtained, action is subtracted with the time of trip signal
The time of signal obtains the actuation time that subway direct current protecting device realizes direct-current short circuit rate of current rise protection；It is also possible to
Obtain direct-current short circuit current value I2, I1 when direct-current short circuit current value I1 and trip signal of the action signal when sending are sent and
I2 is the variable parameter of the direct-current short circuit rate of current rise protection of subway direct current protecting device.
S400, according to the actuation time of subway direct current protecting device and the variable parameter of subway direct current protecting device, obtain
To the protective value of subway direct current protecting device.
According to the actuation time of subway direct current protecting device and the variable parameter of subway direct current protecting device, subway is obtained
The step of protective value of direct current protecting device, includes：
The preset value of the actuation time of subway direct current protecting device and the actuation time of subway direct current protecting device are carried out
Compare, obtain the response performance of subway direct current protecting device；
The preset value of the variable parameter of subway direct current protecting device and the variable parameter of subway direct current protecting device is carried out
Compare, obtain the performance parameters of subway direct current protecting device；
According to the response performance and performance parameters of subway direct current protecting device, the protection of subway direct current protecting device is obtained
Performance.
The test event of subway direct current protecting device can select test event including multiple by user.Each test
Project all respective action time and variable parameter, the test item is obtained by the actuation time and variable parameter of each test event
Purpose protective value, for example, direct current fast tripping protection actuation time be less than direct current fast tripping protection actuation time preset value, then
The response performance of direct current fast tripping protection is qualified；The variable parameter of direct current fast tripping protection is less than the variable parameter of direct current fast tripping protection
Preset value, then the performance parameters of direct current fast tripping protection are qualified.Only the response performance of direct current fast tripping protection and performance parameters are closed
Lattice, the protective value of direct current fast tripping protection is just qualified, and comprehensive all test events obtain the protection of subway direct current protecting device
Performance.It is non-essential, priority ranking can be carried out to test event, such as according to test event to subway direct current protecting device
The importance ranking of performance is direct current fast tripping protection, DC Curent Derivation and increment protection, DC overcurrent protection, straight
Stream under-voltage protection, thermal overload protection and DC two-sided anti-interference protection are followed successively by the first priority, the second priority, the 3rd
Priority, the 4th priority, the 5th priority and the 6th priority, the first priority are higher than the second priority, and second is preferential
Level is higher than third priority, and the rest may be inferred, and on the basis of the protective value of all test events is qualified, priority level is high
The protective value of test event is better, and the protective value of subway direct current protecting device is better.
A kind of computer-readable recording medium, is stored thereon with computer program, and the program is realized when being executed by processor
The step of above method.
A kind of computer equipment, including memory, processor and storage can be run on a memory and on a processor
Computer program, the step of realizing the above method during computing device program.
Method of testing, computer-readable recording medium and the computer equipment of above-mentioned subway direct current protecting device, connect first
Default test data is received, parses default test data, the input signal of subway direct current protecting device is obtained and sends straight to subway
Flow protection device；Receive the output action signal that subway direct current protecting device generates according to input signal；Then it is dynamic according to output
Make signal, obtain the actuation time of subway direct current protecting device and the variable parameter of subway direct current protecting device；According to subway
The actuation time of direct current protecting device and the variable parameter of subway direct current protecting device, obtain the guarantor of subway direct current protecting device
Performance is protected, whether the method for testing of such subway direct current protecting device acts without manually observation subway direct current protecting device,
The automatic protective value for obtaining subway direct current protecting device, can effectively improve operating efficiency.
In one embodiment, subway direct current protecting device root is received in the method for testing of subway direct current protecting device automatically
Also include after the step of output action signal generated according to input signal：
The relay protective scheme of subway direct current protecting device is obtained according to output action signal, relay protective scheme is verified.
Due to the phenomenon of the failure variation occurred on circuit, subway direct current protecting device shows according to the failure being likely to occur
As making logic judgment, driving circuit breaker trip.For example during the generation of some failure, subway direct current protecting device needs first direct current
Short circuit current rate of change and increment protection and then again DC overcurrent protection, believed according to the output action of subway direct current protecting device
Number, the relay protective scheme when failure occurs can be verified.
In one embodiment, according to the action of subway direct current protecting device in the method for testing of subway direct current protecting device
Time and the variable parameter of subway direct current protecting device, after the step of obtaining the protective value of subway direct current protecting device also
Including：
Based on the protective value of subway direct current protecting device, the test report of generation subway direct current protecting device.
After protective value off-test to subway direct current protecting device, test can be automatically generated according to result of the test
Report, such as when test report can include carrying out a certain fault test project, the protective value of subway direct current protecting device with
And some specific actuation times and variable parameter, so as to checking for user's intuitive and convenient.
In one embodiment, as shown in figure 3, a kind of test device of subway direct current protecting device, including：
Data resolution module 100, for receiving default test data, default test data is parsed, obtains subway direct current guarantor
The input signal of protection unit is simultaneously sent to subway direct current protecting device；
Signal generation module 200, believe for receiving the output action that subway direct current protecting device generates according to input signal
Number；
Parameter acquisition module 300, for according to output action signal, obtain the actuation time of subway direct current protecting device with
And the variable parameter of subway direct current protecting device；
Performance estimation module 400, filled for the actuation time according to subway direct current protecting device and subway direct current protecting
The variable parameter put, obtain the protective value of subway direct current protecting device.
The test device of above-mentioned subway direct current protecting device, including data resolution module 100, signal generation module 200, ginseng
Number acquisition module 300 and performance estimation module 400, data resolution module 100 are used to receive default test data, and parsing is default
Test data, obtain the input signal of subway direct current protecting device and send to subway direct current protecting device；Signal generation module
200 are used to receive the output action signal that subway direct current protecting device generates according to input signal；Parameter acquisition module 300 is used for
According to output action signal, the actuation time of subway direct current protecting device and the variable ginseng of subway direct current protecting device are obtained
Number；Performance estimation module 400 is used for according to the actuation time of subway direct current protecting device and the change of subway direct current protecting device
Parameter is measured, obtains the protective value of subway direct current protecting device, the test device of such subway direct current protecting device is without people
Whether work observation subway direct current protecting device acts, and the automatic protective value for obtaining subway direct current protecting device can be effectively
Improve operating efficiency.
In one embodiment, performance estimation module includes in the test device of subway direct current protecting device：
Response performance assessment unit, for by the actuation time of subway direct current protecting device and subway direct current protecting device
The preset value of actuation time is compared, and obtains the response performance of subway direct current protecting device；
Performance parameters assessment unit, for by the variable parameter of subway direct current protecting device and subway direct current protecting device
The preset value of variable parameter is compared, and obtains the performance parameters of subway direct current protecting device；
Protective value assessment unit, for the response performance and performance parameters according to subway direct current protecting device, obtain
The protective value of subway direct current protecting device.
In one embodiment, signal generation module includes in the test device of subway direct current protecting device：
Signal resolution unit, for obtained according to output action signal action signal time and trip signal when
Between；
Time acquisition unit, for the time and the time of trip signal according to action signal, obtain subway direct current guarantor
The actuation time of protection unit.
In one embodiment, a kind of test device of subway direct current protecting device, including On-off signal terminal and
Control process module, On-off signal terminal connect with the lead-out terminal and control process module of subway direct current protecting device respectively
Connect, control process module is connected with the input terminal of subway direct current protecting device；
Control process module sends input signal to the input terminal of subway direct current protecting device according to default test data,
The output action signal of the lead-out terminal of On-off signal terminal collection subway direct current protecting device, control process module is according to defeated
Go out action signal, obtain actuation time and the variable parameter of subway direct current protecting device, and then show that subway direct current protecting fills
The protective value put.
Wherein, control process module includes arm processor and FPGA, and arm processor receives the default survey that host computer is sent
Data are tried, and default test data is sent to the input terminal of subway direct current protecting device by FPGA.Specifically, subway is straight
The test device of stream protection device also includes output switch parameter terminal, and output switch parameter terminal is connected with control process module.Enter
One step, the test device of subway direct current protecting device also includes digital analog converter, and control process module passes through digital-to-analogue processor
It is connected with output switch parameter terminal, digital quantity signal can be converted to analog signalses by digital analog converter.Further, ground
The test device of iron direct current protecting device also includes power module, and power module is connected with control process module, and power module is
The test device of subway direct current protecting device provides power supply, to ensure being normally carried out for test.
The test device of the subway direct current protecting device of the present invention and the test side of the subway direct current protecting device of the present invention
Method corresponds, the technical characteristic illustrated in the embodiment of the method for testing of above-mentioned subway direct current protecting device and its beneficial effect
Fruit is suitable for the embodiment of the test device of subway direct current protecting device.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that come for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of method of testing of subway direct current protecting device, it is characterised in that including step：
Default test data is received, parses the default test data, obtains the input signal of subway direct current protecting device, and will
The input signal is sent to the subway direct current protecting device；
Automatically the output action signal that the subway direct current protecting device generates according to the input signal is received；
According to the output action signal, the actuation time and the subway direct current for obtaining the subway direct current protecting device protect
The variable parameter of protection unit；
According to the actuation time of the subway direct current protecting device and the variable parameter of the subway direct current protecting device, obtain
The protective value of the subway direct current protecting device.
2. the method for testing of subway direct current protecting device according to claim 1, it is characterised in that it is described according to described
The actuation time of iron direct current protecting device and the variable parameter of the subway direct current protecting device, obtain the subway direct current and protect
The step of protective value of protection unit, includes：
By the preset value of the actuation time of the subway direct current protecting device and the actuation time of the subway direct current protecting device
It is compared, obtains the response performance of the subway direct current protecting device；
By the preset value of the variable parameter of the subway direct current protecting device and the variable parameter of the subway direct current protecting device
It is compared, obtains the performance parameters of the subway direct current protecting device；
According to the response performance of the subway direct current protecting device and the performance parameters, the subway direct current protecting dress is obtained
The protective value put.
3. the method for testing of subway direct current protecting device according to claim 1, it is characterised in that described according to described defeated
The step of going out action signal, obtaining the actuation time of the subway direct current protecting device includes：
The time of the action signal and the time of trip signal are obtained according to the output action signal；
According to the time of the action signal and the time of the trip signal, the dynamic of the subway direct current protecting device is obtained
Make the time.
4. the method for testing of subway direct current protecting device according to claim 1, it is characterised in that the automatic reception institute
Also include after the step of stating the output action signal that subway direct current protecting device generates according to the input signal：
The relay protective scheme of the subway direct current protecting device is obtained according to the output action signal, the relay protective scheme is carried out
Verification.
5. the method for testing of subway direct current protecting device according to claim 1, it is characterised in that it is described according to described
The actuation time of iron direct current protecting device and the variable parameter of the subway direct current protecting device, obtain the subway direct current and protect
Also include after the step of protective value of protection unit：
Based on the protective value of the subway direct current protecting device, the test report of the subway direct current protecting device is generated.
A kind of 6. test device of subway direct current protecting device, it is characterised in that including：
Data resolution module, for receiving default test data, the default test data is parsed, obtain subway direct current protecting dress
The input signal put, and the input signal is sent to the subway direct current protecting device；
Signal generation module, moved for receiving the output that the subway direct current protecting device generates according to the input signal automatically
Make signal；
Parameter acquisition module, for according to the output action signal, obtaining the actuation time of the subway direct current protecting device
And the variable parameter of the subway direct current protecting device；
Performance estimation module, filled for the actuation time according to the subway direct current protecting device and the subway direct current protecting
The variable parameter put, obtain the protective value of the subway direct current protecting device.
7. the test device of subway direct current protecting device according to claim 6, it is characterised in that the Performance Evaluation mould
Block includes：
Response performance assessment unit, for the actuation time of the subway direct current protecting device and the subway direct current protecting to be filled
The preset value for the actuation time put is compared, and obtains the response performance of the subway direct current protecting device；
Performance parameters assessment unit, for the variable parameter of the subway direct current protecting device and the subway direct current protecting to be filled
The preset value for the variable parameter put is compared, and obtains the performance parameters of the subway direct current protecting device；
Protective value assessment unit, for the response performance according to the subway direct current protecting device and the performance parameters,
Obtain the protective value of the subway direct current protecting device.
8. the test device of subway direct current protecting device according to claim 6, it is characterised in that the signal generation mould
Block includes：
Signal resolution unit, for obtaining according to the output action signal time and the trip signal of the action signal
Time；
Time acquisition unit, for the time according to the action signal and the time of the trip signal, obtain describedly
The actuation time of iron direct current protecting device.
9. a kind of computer-readable recording medium, is stored thereon with computer program, it is characterised in that described program is by processor
The step of any one methods described in claim 1-5 is realized during execution.
10. a kind of computer equipment, including memory, processor and storage are on a memory and the meter that can run on a processor
Calculation machine program, it is characterised in that any one methods described in claim 1-5 is realized during the computing device described program
The step of.
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| CN201710724138.XA CN107688128A (en) | 2017-08-22 | 2017-08-22 | Method of testing, device, computer-readable recording medium and the computer equipment of subway direct current protecting device |
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| CN201710724138.XA CN107688128A (en) | 2017-08-22 | 2017-08-22 | Method of testing, device, computer-readable recording medium and the computer equipment of subway direct current protecting device |
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| CN108957238A (en) * | 2018-08-01 | 2018-12-07 | 广州白云电器设备股份有限公司 | The device and method of urban rail transit contact network fault location |
| CN109188308A (en) * | 2018-09-11 | 2019-01-11 | 广州得元电力科技有限公司 | A kind of DC traction power-supply system current step change protection test method and system |
| CN109444568A (en) * | 2018-09-11 | 2019-03-08 | 广州得元电力科技有限公司 | A kind of DC traction power-supply system rate of current rise protection test method and system |
| CN109709416A (en) * | 2018-12-11 | 2019-05-03 | 南京南瑞继保电气有限公司 | A kind of subway direct current test apparatus and test method |
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