CN104267365A - Portable small current earth-fault line selection closed loop performance tester - Google Patents
Portable small current earth-fault line selection closed loop performance tester Download PDFInfo
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- CN104267365A CN104267365A CN201410521628.6A CN201410521628A CN104267365A CN 104267365 A CN104267365 A CN 104267365A CN 201410521628 A CN201410521628 A CN 201410521628A CN 104267365 A CN104267365 A CN 104267365A
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Abstract
The invention discloses a portable small current earth-fault line selection closed loop performance tester. The portable small current earth-fault line selection closed loop performance tester is composed of a man-computer interface, a master control module, a waveform database, a signal output module, a communication module and the like. According to the portable small current earth-fault line selection closed loop performance tester, due to the fact that a typical offline power distribution network model is established, the single-phase earth fault scenes of a small current grounding system in various modes are simulated accurately, current and voltage waveform data reflecting the fault characteristics are led into the small current earth-fault line selection tester, a line selection result for a device to be tested is obtained automatically according to the output of the device to be tested by connecting the tester with a communication interface of the device to be tested, then an automatic closed loop testing system is formed, in this way, the actual line selection accuracy and the rationality of line selection strategies and parameter setting are checked, the operating efficiency and the maintaining efficiency of the device are improved, on-site transient state performance testing of the small current earth-fault line selection device is achieved, an effective method is provided for inspection, acceptance and regular maintenance of the small current earth-fault line selection device, and the device plays an important role and has great significance in improving small current earth-fault line selection accuracy.
Description
technical field
The present invention relates to a kind of portable small current earthing wire-selecting closed-loop characteristic tester, belong to power system device technical field of measurement and test.
background technology
Domestic power distribution network is usually with isolated neutral or through these two kinds of earthing modes of grounding through arc.When there is singlephase earth fault in system with non-effectively earthed neutral, three-phase voltage remains symmetrical, the fault current produced due to fault phase is smaller, the continuous power supply to load can't be affected, can trip immediately, operation can be continued 2 hours according to regulations stipulate, to reduce the interruption of electric power supply, improve power supply reliability.Traditional fault line selection method for single-phase-to-ground fault adopts artificial bracing wire method, namely passes through one by one circuit deciliter and searches singlephase earth fault circuit, cause power failure range to expand, trouble shooting time is long, affect power supply reliability, therefore, need for the suitable Small Electric Current Earthing And Routing Device of system configuration.
Principle and the software and hardware structure of Small Electric Current Earthing And Routing Device are not quite similar, principle is based on based on Transient Signal Processing algorithm, signal characteristic affects very large by the power distribution network method of operation and fault type, traditional test means can only input steady state fault signal, testing reliability, environment authenticity, the problem that all many-sides such as testing process and testing efficiency are brought is needed badly and is effectively solved, the route selection performance of Small Electric Current Earthing And Routing Device cannot be checked, classic method is the specific fault form for the imagination, fail to take into full account the actual operating mode of electrical network, also dynamic and transient state component when fault of cannot truly reducing occurs, test environment, testing process, test specification is not pointed, the field performance test of Small Electric Current Earthing And Routing Device can not be adapted to, manual testing has following drawback in addition: emphasize that monomer test is not tested device cooperation ability in systems in which, adopt and test item by item, pay attention to basic function, ignore prior performance test in some actual motions such as device dynamic property, build test environment, the project of device to test is many, and testing tool is scattered temporarily.Power distribution network operations staff lacks pointed grounding line selection device field portable tester, actual field can be brought it to easily, for power grid architecture and the operating condition at Devices to test place, carry out man-to-man particular test then and there, whether the performance of this route selection equipment of direct check can meet job requirement, for the setting parameter of route selection equipment, lack foundation of adjusting, particularly when the rack of power distribution network easily changes, so the optimum configurations of route selection equipment also should adjust thereupon.Often some route selection equipment is when just putting into operation, and action accuracy is also higher, but over time, after special rack changes, reliability significantly reduces.This certainly will cause immeasurable consequence to the realization of the specific defencive function of electrical network and safe and stable operation.
Therefore, design a kind of portable small current earthing wire-selecting closed-loop characteristic testing tool being applicable to on-the-spot test, closed loop test system is unified into on-the-spot Devices to test, thus check its real route selection accuracy rate, and the rationality of route selection strategy and setting parameter, simplify test operation flow process, automatically closed-loop characteristic test is completed, raising equipment O&M overhaul efficiency, to reach the quick and precisely localization of faults, accelerate to search the distribution network line grounding fault time, shorten the object of customer outage hours and raising resident power supply reliability, and promote further developing of distribution self-healing and even power distribution automation field.
summary of the invention
The object of the invention is to, a kind of portable small current earthing wire-selecting closed-loop characteristic testing tool is provided, realize on-the-spot closed loop test and the function policy verification of Small Electric Current Earthing And Routing Device performance.
Technical scheme of the present invention is, a kind of portable small current earthing wire-selecting closed-loop characteristic tester of the present invention is made up of man-machine interface, main control module, waveform database, signal output module, communication module.
Main control module, for extracting test waveform in advance from waveform database, the test event selected in conjunction with user forms concrete testing process and step; Automatic control test process, and form test report, realize on-the-spot automated closed-loop performance test;
Man-machine interface, browses and checks for realizing test waveform file and test report, signal output channels and communication interface parameter configuration; Realize control and the information interaction of testing process, and automatically generate test report.
Waveform database, for stored in the test waveform in calling data storehouse;
Signal output module, for earth fault character voltage, current signal are become simulating signal by digital signal after digital-to-analog conversion, obtain the voltage and current simulating signal corresponding with secondary system side via multiplying arrangement again, be supplied to route selection testing equipment;
Communication module, for realizing the importing of off-line fault waveform data, supporting various communication interface type and the standard agreement of Small Electric Current Earthing And Routing Device to be measured, can obtain action and the route selection object information of Devices to test;
Described main control module is bi-directionally connected with man-machine interface, waveform database, signal output module, communication module respectively.
Described tester is by taking the typical distribution pessimistic concurrency control of off-line, the singlephase earth fault scene of small current neutral grounding system under the various mode of accurate analog, the current and voltage signals of faults feature is imported small current earthing wire-selecting tester, closed loop test system is combined with Devices to test, robotization completes closed loop test, can verify the operating condition under the various routine of Small Electric Current Earthing And Routing Device to be measured and extreme case and route selection ability at the scene comprehensively.
Described human-computer interface module adopts Embedded Touch Screen, and the actual conditions according to small current neutral grounding can arrange testing process and test event.
The method of operation of the small current neutral grounding system that described main control module is arranged according to user and earthing mode parameter, extract test waveform in advance from waveform database, and the test event selected in conjunction with user forms concrete testing process and step.
The waveform of described Wave data library storage comprises, power distribution network single busbar, sectionalized single busbar connection different running method is considered during typical case's test scene model buildings, isolated neutral system, arc suppression coil earthing system earthing mode different from small resistance grounding system, the Multiple Combination of low-impedance earthed system fault, high resistance earthing fault, arc grounding fault, batch (-type) earth fault different faults type, form the fault waveform of small current earthing wire-selecting test under typical scene.
The signal output accuracy of described signal output module is 0.2 grade, response time is not more than 5ms, can the transient information of complete reaction singlephase earth fault, can ensure that tester completes the on-the-spot test of 32 road feeder lines, and power amplification system stable performance, output power, amplitude meet transient test requirement.
Principle of work of the present invention is, ripple is recorded and the adjustment with model parameter of building that test scene can be carried out easily by importing actual field in user interface, thus the fault signature voltage under acquisition failure environment, current signal, and will the fault signature voltage of ripple or acquisition be recorded, current signal is sent to small current neutral grounding device to test instrument by network interface or optical fiber, the digital signal received is become simulating signal by tester after digital-to-analog conversion, the voltage and current simulating signal corresponding with secondary system side is obtained again via multiplying arrangement, be supplied to route selection testing equipment, tester can complete the on-the-spot test of 32 road feeder lines, power amplification system stable performance, output power, amplitude meets transient test requirement, can the transient state component of complete reaction singlephase earth fault.
The present invention can reflect the actual operating mode of various be measured electrical network truely and accurately in order to obtain, and can various malfunction be simulated, export the crucial current-voltage waveform data of fault, set up small current earthing wire-selecting typical test scene model under various rack, various earthing mode and various fault type.To factors such as power distribution network framework, neutral grounding mode, voltage and CT configuration types, and utilize the general Run-time scenario of generalise results reduction distribution terminal, build and build electricity distribution network model flexibly based on power distribution network simulation software.
The present invention is according to the operating experience of power distribution network, in conjunction with small current neutral grounding system on-site actual situations, simulation obtains corresponding fault signature voltage, current signal, the fault waveform of small current earthing wire-selecting test under formation typical scene, by the test signal under these typical fault scenes stored in built-in waveform database, can test waveform directly in calling data storehouse in test link, saving model debugging workload.
The present invention is by On-off signal and standard data communications interface, tester can receive the route selection object information of equipment under test, realize small area analysis wiring line selection apparatus automated closed-loop Testing Technology Study under each scene and operating condition, simplify test operation flow process, improve test accuracy and efficiency, check its real route selection accuracy rate, and the rationality of route selection strategy and setting parameter, and test result can be fed back, automatically form test report.
The invention has the beneficial effects as follows, the present invention's portable small current earthing wire-selecting closed loop test instrument can verify operating condition under the various routine of test system and extreme case and route selection performance at the scene comprehensively, simplify loaded down with trivial details testing process, to reach the object of raising equipment reliability of operation.Typical distribution pessimistic concurrency control is built by what take off-line, the singlephase earth fault scene of small current neutral grounding system under the various mode of accurate analog, the current and voltage signals of faults feature is imported small current earthing wire-selecting tester, by connecting the amount of outputing and the communication interface of Devices to test, the route selection result of automatic discrimination Devices to test, form automatic closed loop test system, thus the real route selection accuracy rate of inspection machine and accuracy.
The invention has the beneficial effects as follows, the present invention is based on a kind of portable small current earthing wire-selecting closed-loop characteristic testing tool being applicable to on-the-spot test, automatic closed loop test system is connected into on-the-spot Devices to test, thus check its real route selection accuracy rate, and the rationality of route selection strategy and setting parameter, simplify test operation flow process, robotization completes closed loop test, raising equipment O&M overhaul efficiency, realize the on-the-spot transient performance test of Small Electric Current Earthing And Routing Device, have important function and significance to the accuracy promoting small current earthing wire-selecting.
accompanying drawing explanation
Fig. 1 is the project organization block diagram of a kind of portable small current earthing wire-selecting closed-loop characteristic tester of the present invention.
embodiment
The specific embodiment of the present invention as shown in Figure 1.
Portable small current earthing wire-selecting closed-loop characteristic tester is made up of man-machine interface, main control module, waveform database, signal output module, communication module etc.
(1) man-machine interface adopts Embedded Touch Screen, and the actual conditions according to small current neutral grounding can arrange testing process and test event, realizes test waveform file and test report and browses and check, the functions such as signal output channels and communication interface parameter configuration.
(2) parameter such as the method for operation of small current neutral grounding system that arranges according to user of main control module and earthing mode, from waveform database, extract test waveform in advance, the test event selected in conjunction with user forms concrete testing process and step; The route selection result that main control module is transmitted by communication interface modules controls test process automatically, and forms test report, realizes on-the-spot automated closed-loop performance test.
(3) the waveform quantity of waveform database is more than 200 kinds, typical case's test scene model buildings considers power distribution network single busbar, the different running method such as sectionalized single busbar connection, isolated neutral system, the different earthing mode such as arc suppression coil earthing system and small resistance grounding system, low-impedance earthed system fault, high resistance earthing fault, arc grounding fault, the Multiple Combination of the different faults types such as batch (-type) earth fault, in conjunction with small current neutral grounding system on-site actual situations, simulation obtains corresponding fault signature voltage, current signal, the fault waveform of small current earthing wire-selecting test under formation typical scene, by the test signal under these typical fault scenes stored in built-in waveform database, can test waveform directly in calling data storehouse in test link.
(4) earth fault character voltage, current signal are become simulating signal by digital signal by signal output module after digital-to-analog conversion, the voltage and current simulating signal corresponding with secondary system side is obtained again via multiplying arrangement, be supplied to route selection testing equipment, tester can complete the on-the-spot test of 32 road feeder lines, require power amplification system stable performance, output power, amplitude meet transient test requirement, signal output accuracy is 0.2 grade, response time is not more than 5ms, can the transient information of complete reaction singlephase earth fault.
(5) communication interface modules can realize the importing of off-line fault waveform data, supports various communication interface type and the standard agreement of Small Electric Current Earthing And Routing Device to be measured, can obtain action and the route selection object information of Devices to test.
Claims (6)
1. a portable small current earthing wire-selecting closed-loop characteristic tester, is characterized in that, comprising:
Main control module, for extracting test waveform in advance from waveform database, the test event selected in conjunction with user forms concrete testing process and step; Automatic control test process, and form test report, realize on-the-spot automated closed-loop performance test;
Man-machine interface, browses check that signal output channels and communication interface parameter configuration realize control and the information interaction of testing process, and automatically generate test report for realizing test waveform file and test report;
Waveform database, for stored in the test waveform in calling data storehouse;
Signal output module, for earth fault character voltage, current signal are become simulating signal by digital signal after digital-to-analog conversion, obtain the voltage and current simulating signal corresponding with secondary system side via multiplying arrangement again, be supplied to route selection testing equipment;
Communication module, for realizing the importing of off-line fault waveform data, supporting various communication interface type and the standard agreement of Small Electric Current Earthing And Routing Device to be measured, can obtain action and the route selection object information of Devices to test;
Described tester is by taking the typical distribution pessimistic concurrency control of off-line, the singlephase earth fault scene of small current neutral grounding system under the various mode of accurate analog, the current and voltage signals of faults feature is imported small current earthing wire-selecting tester, closed loop test system is combined with Devices to test, robotization completes closed loop test, can verify the operating condition under the various routine of Small Electric Current Earthing And Routing Device to be measured and extreme case and route selection ability at the scene comprehensively.
2. one according to claim 1 portable small current earthing wire-selecting closed-loop characteristic tester, is characterized in that, described human-computer interface module adopts Embedded Touch Screen, and the actual conditions according to small current neutral grounding can arrange testing process and test event.
3. one according to claim 1 portable small current earthing wire-selecting closed-loop characteristic tester, it is characterized in that, the method of operation of the small current neutral grounding system that described main control module is arranged according to user and earthing mode parameter, from waveform database, extract test waveform in advance, the test event selected in conjunction with user forms concrete testing process and step.
4. one according to claim 1 portable small current earthing wire-selecting closed-loop characteristic tester, it is characterized in that, the waveform of described Wave data library storage comprises, power distribution network single busbar is considered during typical case's test scene model buildings, sectionalized single busbar connection different running method, isolated neutral system, arc suppression coil earthing system earthing mode different from small resistance grounding system, low-impedance earthed system fault, high resistance earthing fault, arc grounding fault, the Multiple Combination of batch (-type) earth fault different faults type, the fault waveform of small current earthing wire-selecting test under formation typical scene.
5. one according to claim 1 portable small current earthing wire-selecting closed-loop characteristic tester, it is characterized in that, the signal output accuracy of described signal output module is 0.2 grade, response time is not more than 5ms, can the transient information of complete reaction singlephase earth fault, can ensure that tester completes the on-the-spot test of 32 road feeder lines, and power amplification system stable performance, output power, amplitude meet transient test requirement.
6. one according to claim 1 portable small current earthing wire-selecting closed-loop characteristic tester, is characterized in that, described main control module is bi-directionally connected with man-machine interface, waveform database, signal output module, communication module respectively.
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| CN201410521628.6A CN104267365A (en) | 2014-10-08 | 2014-10-08 | Portable small current earth-fault line selection closed loop performance tester |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104793101A (en) * | 2015-02-03 | 2015-07-22 | 广西电网有限责任公司电力科学研究院 | Transient travelling wave small-current grounding line selection device and test method thereof |
| CN107462801A (en) * | 2017-08-14 | 2017-12-12 | 国网天津市电力公司 | A kind of portable Small Electric Current Earthing And Routing Device dynamic simulation test device |
| CN108535677A (en) * | 2017-07-21 | 2018-09-14 | 国网湖北省电力公司孝感供电公司 | A kind of test system of the practical route selection effect of low current neutral grounding system fault route selecting device |
| CN108761231A (en) * | 2018-05-22 | 2018-11-06 | 李景禄 | A kind of the intelligent checking method and instrument of automatic arc-suppressing device and line-selected earthing device |
| CN108983137A (en) * | 2018-07-23 | 2018-12-11 | 济南置真电气有限公司 | A kind of system and method for detection single-phase earth fault line selection tripping round cut reliability |
| CN108983135A (en) * | 2018-05-17 | 2018-12-11 | 济南置真电气有限公司 | A method of for verifying low-current ground fault line selection algorithm accuracy rate |
| CN109406955A (en) * | 2019-01-04 | 2019-03-01 | 国网江苏省电力有限公司宿迁供电分公司 | A kind of simulation short circuit and ground fault device |
| CN109507525A (en) * | 2018-10-26 | 2019-03-22 | 国网江西省电力有限公司电力科学研究院 | A kind of earth-fault detecting method based on amendment transient reactive power method |
| CN110865277A (en) * | 2019-12-04 | 2020-03-06 | 国网冀北电力有限公司电力科学研究院 | Feeder automation function testing device |
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2014
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104793101A (en) * | 2015-02-03 | 2015-07-22 | 广西电网有限责任公司电力科学研究院 | Transient travelling wave small-current grounding line selection device and test method thereof |
| CN104793101B (en) * | 2015-02-03 | 2017-10-24 | 广西电网有限责任公司电力科学研究院 | A kind of transient state travelling wave Small Electric Current Earthing And Routing Device |
| CN108535677A (en) * | 2017-07-21 | 2018-09-14 | 国网湖北省电力公司孝感供电公司 | A kind of test system of the practical route selection effect of low current neutral grounding system fault route selecting device |
| CN107462801A (en) * | 2017-08-14 | 2017-12-12 | 国网天津市电力公司 | A kind of portable Small Electric Current Earthing And Routing Device dynamic simulation test device |
| CN108983135A (en) * | 2018-05-17 | 2018-12-11 | 济南置真电气有限公司 | A method of for verifying low-current ground fault line selection algorithm accuracy rate |
| CN108761231A (en) * | 2018-05-22 | 2018-11-06 | 李景禄 | A kind of the intelligent checking method and instrument of automatic arc-suppressing device and line-selected earthing device |
| CN108983137A (en) * | 2018-07-23 | 2018-12-11 | 济南置真电气有限公司 | A kind of system and method for detection single-phase earth fault line selection tripping round cut reliability |
| CN109507525A (en) * | 2018-10-26 | 2019-03-22 | 国网江西省电力有限公司电力科学研究院 | A kind of earth-fault detecting method based on amendment transient reactive power method |
| CN109406955A (en) * | 2019-01-04 | 2019-03-01 | 国网江苏省电力有限公司宿迁供电分公司 | A kind of simulation short circuit and ground fault device |
| CN110865277A (en) * | 2019-12-04 | 2020-03-06 | 国网冀北电力有限公司电力科学研究院 | Feeder automation function testing device |
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