CN105388416B - The distant check system of having a try of intelligent substation relay protection - Google Patents

The distant check system of having a try of intelligent substation relay protection Download PDF

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Publication number
CN105388416B
CN105388416B CN201510784668.4A CN201510784668A CN105388416B CN 105388416 B CN105388416 B CN 105388416B CN 201510784668 A CN201510784668 A CN 201510784668A CN 105388416 B CN105388416 B CN 105388416B
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China
Prior art keywords
relay
intelligent substation
test
protection
distant
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CN201510784668.4A
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Chinese (zh)
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CN105388416A (en
Inventor
张立辉
陈磊
陈炎
乔辉
尹宏
王江涛
伍艳
张罡帅
王光华
时广毅
马晶晶
王冠
张雷
崔良
王晓蒙
南康
芦杰敏
李晓影
赵炜
牛理达
张乾
刘培
马彦敏
孔令号
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State Grid Corp of China SGCC
State Grid Hebei Electric Power Co Ltd
Baoding Power Supply Co of State Grid Hebei Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
State Grid Hebei Electric Power Co Ltd
Baoding Power Supply Co of State Grid Hebei Electric Power Co Ltd
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Application filed by State Grid Corp of China SGCC, State Grid Hebei Electric Power Co Ltd, Baoding Power Supply Co of State Grid Hebei Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201510784668.4A priority Critical patent/CN105388416B/en
Publication of CN105388416A publication Critical patent/CN105388416A/en
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Abstract

The invention discloses a kind of distant check system of having a try of intelligent substation relay protection, including:Remote control terminal, relay-protection tester, interchanger and local control terminal;Remote control terminal has the telecontrol communication machine for issuing the distant place control system of test initiation command and being connect with distant place control system;Relay-protection tester is arranged in intelligent substation; the Enable Pin of relay-protection tester is connect by interchanger with telecontrol communication machine; to receive the test initiation command of telecontrol communication machine transmission; multiple output terminals of relay-protection tester are connect one by one with the test interface of a variety of protective devices in intelligent substation, and the input terminal of relay-protection tester is connect by interchanger with the network interface of a variety of protective devices;Local control terminal is arranged in intelligent substation, and the first output terminal of local control terminal is connected by the Enable Pin of interchanger and relay-protection tester.Pass through above-mentioned technical proposal of the present invention improves testing efficiency during protective device debugging.

Description

The distant check system of having a try of intelligent substation relay protection
Technical field
The present invention relates to the testing field of transforming plant protecting device, more particularly to a kind of distant examination of intelligent substation relay protection Pilot system.
Background technology
The protective device of substation is the core of protecting electrical power system, and logic and the correctness set are related in electric power Can breaker rapidly and accurately tripping be to cut off failure during system jam, so as to ensure the stable operation of electric system. Therefore, the debugging process of protective device is extremely important, it directly affects the correct action of protective device and power system stability fortune Row.
In the prior art, when being debugged to protective device, need commissioning staff to scene by by relay protection test Instrument is connected in protective device, then carries out related commissioning work.Since the type of protective device is various, and it is distributed in differently Point, this scheme undoubtedly increases so that the debugging work load of protective device is big, and task is heavy, and testing efficiency is low.
Invention content
The main object of the present invention is to provide a kind of distant check system of having a try of intelligent substation relay protection, existing at least to solve There is the problem of testing efficiency of protective device present in technology is low.
In order to achieve the above object, an embodiment of the present invention provides a kind of intelligent substation relay protection it is distant have a try to test be System, including:Remote control terminal, relay-protection tester, interchanger and local control terminal;The remote control terminal tool There are the distant place control system for issuing test initiation command and the telecontrol communication machine being connect with the distant place control system;The relay protection Tester is arranged in intelligent substation, and the Enable Pin of the relay-protection tester passes through the interchanger and the telecontrol communication machine Connection, to receive the test initiation command of telecontrol communication machine transmission, multiple output terminals of the relay-protection tester with it is described The test interface of a variety of protective devices in intelligent substation connects one by one, and the input terminal of the relay-protection tester passes through institute The network interface that interchanger is stated with a variety of protective devices is connect, to identify protective device to be tested;The local control Terminal is arranged in the intelligent substation, it is described local control terminal the first output terminal by the interchanger with it is described after The Enable Pin connection of electric protection tester.
In the distant check system of having a try of intelligent substation relay protection as described above, it is preferable that the remote control terminal is also Including the first fingerprint machine, the output terminal of first fingerprint machine is connect with the start end of the distant place control system.
In the distant check system of having a try of intelligent substation relay protection as described above, it is preferable that the local control terminal packet The second fingerprint machine and monitoring equipment are included, the output terminal of second fingerprint machine is connect with the start end of the monitoring equipment, the monitoring First output terminal of first output terminal of machine for the local control terminal.
In the distant check system of having a try of intelligent substation relay protection as described above, it is preferable that the local control terminal is also Including printer, the input terminal of the printer is connect with the second output terminal of the monitoring equipment, and the second of the monitoring equipment is defeated Second output terminal of the outlet for the local control terminal.
In the distant check system of having a try of intelligent substation relay protection as described above, it is preferable that the relay-protection tester It is connect by optical fiber with the protective device.
In the distant check system of having a try of intelligent substation relay protection as described above, it is preferable that the output of the protective device End is connect by optical fiber with the intelligent terminal of the intelligent substation, and the intelligent terminal passes through cable and the intelligent substation Breaker connected with disconnecting switch.
In the distant check system of having a try of intelligent substation relay protection as described above, it is preferable that the distant place control system is used According to different types of protective device, corresponding template file is previously stored with, the template file includes each protection dress The detection project sequence and detection ordering put;After the test initiation command is sent out, the distant place control system identifies protection The type of device, and detection project is performed one by one according to the detection ordering of corresponding protective device, the detection project is used to indicate The protective device is tested in the relay-protection tester execution.
In the distant check system of having a try of intelligent substation relay protection as described above, it is preferable that the distant place control system is also Original configuration information of protective device can be read, the configuration information includes protecting the definite value of the protection unit and soft pressing plate, and do Good backup;At the end of test, the configuration information of protective device can be compared again, if test is to original configuration Information is changed, and volume is after test, the backup before restoring automatically.
In the distant check system of having a try of intelligent substation relay protection as described above, it is preferable that if the detection project is hand The project completed is moved, then the distant place control system can carry out user information alert so that user to be instructed to complete and the detection Mesh relevant operation after the completion of operation, continues to test by after continued key, so as to complete entire test process.
What embodiment provided by the invention was brought has the beneficial effect that:
It can be in remote side and local side by the test of intelligent substation Relay Protection Experiment System protective device It can complete, improve the convenience of protective device test, enhance the safety tested protective device, improve a variety of guarantors The rapidity of protection unit test, improves the testing efficiency to protective device.
Description of the drawings
Fig. 1 is a kind of structure diagram of the distant check system of having a try of intelligent substation relay protection provided by the invention;
Wherein, symbol description is as follows in figure:
10 distant place control systems, 11 telecontrol communication machines, 20 monitoring equipments, 21 printers, 3 relay-protection testers, 4 protective devices, 5 Interchanger, 6 breakers, 7 disconnecting switch, 80 cables, 81 optical fiber, 82 cables.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention Formula is described in further detail.
Referring to Fig. 1, the present invention provides a kind of distant check system of having a try of intelligent substation relay protection, including:Long-range control Terminal processed, relay-protection tester 3, interchanger 5 and local control terminal.
Wherein, remote control terminal is filled by being controlled in strange land relay-protection tester 3 so as to fulfill to protection 4 remote control is put, including distant place control system 10 and telecontrol communication machine 11.Distant place control system 10 issues test initiation command, Test initiation command is used to that relay-protection tester 3 to be controlled to start.Telecontrol communication machine 11 is used to the test initiation command passing through network Send relay-protection tester 3 to.
Relay-protection tester 3 is arranged in intelligent substation, and Enable Pin is connect by cable 80 with interchanger 5, is handed over It changes planes and 5 is connect by cable 80 with telecontrol communication machine 11, so that relay-protection tester remotely receives the survey of the transmission of telecontrol communication machine 11 Experimental starting instructs, and multiple output terminals are connect one by one with the test interface of a variety of protective devices 4 in intelligent substation, with output Action command, the input terminal of relay-protection tester 3 are connect by interchanger with the network interface of a variety of protective devices 4, to know Protective device not to be tested.The advantages of transmission capacity is big, and transmission quality is good since optical fiber has, and loss is small, and repeater span is long, Relay-protection tester 3 is preferably connect by optical fiber 81 with protective device 4.
Local control terminal is arranged in intelligent substation, for (making locally with relay-protection tester same With in space) relay-protection tester 3 is controlled, it is controlled so as to fulfill the local to protective device 4, the first output terminal It is connect by interchanger 5 with the Enable Pin of relay-protection tester 3.
Since the stable operation of electric system is the powerful guarantee that production and living are able to normal operation, and intelligent substation after Whether the distant check system of having a try of electric protection obtains the stable operation that reasonable employment is related to electric system, therefore remote control terminal is also Including the first fingerprint machine, it is used to export enabling signal.In practice, belong to the distant check system of having a try of the intelligent substation relay protection Operator by the first fingerprint machine export enabling signal to start distant place control system 10, so as to ensure that intelligent substation after The safety of the distant check system of having a try of electric protection.
Local control terminal includes monitoring equipment 20, and the first output terminal of monitoring equipment 20 is first defeated as local control terminal Outlet.In order to enhance the safety of local control terminal, local control terminal further includes the second fingerprint machine, starts letter for exporting Number.In practice, the operator for belonging to the distant check system of having a try of the intelligent substation relay protection passes through the second fingerprint machine in local side Enabling signal is exported to start monitoring equipment 20, so as to ensure that the safety of local control terminal.
For the ease of grasping the operating process to monitoring equipment 20, local control terminal further includes printer 21, input terminal It is connect with the second output terminal of monitoring equipment 20, the second output terminal of the second output terminal of monitoring equipment 20 as local control terminal.
The output terminal of protective device 4 and the intelligent terminal 9 of intelligent substation are connected by optical fiber 81, and intelligent terminal 9 passes through Cable 82 is connect with the action control end of the breaker 6 of intelligent substation and the action control end of disconnecting switch 7, so as to make open circuit Device 6 or disconnecting switch 7 carry out division action after action command is received.
Each output terminal of relay-protection tester 4 has mark, the protection dress that mark connect for characterization with output terminal The type put, so can quick identification protecting device type, so as to improve testing efficiency.
In order to further improve testing efficiency, distant place control system is specifically used for according to different types of protective device, Corresponding template file is previously stored with, which includes the detection project sequence and detection ordering of each protective device. After test initiation command (being referred to as distant place side test enabled instruction at this time) is sent out, distant place control system can identification protecting dress The type put, and detection project is performed one by one according to the detection ordering of corresponding protective device, detection project is used to indicate relay guarantor Protective device is tested in shield tester execution.
Due to the definite value that different test events are related to and soft pressing plate difference, in automatic testing process, distant place control system System can change protective device definite value automatically according to different test events and soft pressing plate is moved back in throwing.Protection dress can be specifically read first Configuration information is put, which includes the definite value of protective device, soft pressing plate, and carries out backup, and safety assurance is provided for test, At the end of test, configuration information can be compared again, if former configuration information is changed in test, then surveying After examination, the backup before restoring automatically.
If detection project is the project manually completed, distant place control system can carry out information alert to instruct to use to user Family is completed and the relevant operation of the detection project, after the completion of operation, continues to test by after continued key, so as to complete entirely to test Process.
If detection project is relay protective scheme test event, distant place control system can set test parameter automatically and control relay Tester is protected to complete test, distant place control system can also obtain the action message of protection automatically, automatic decision test result, And the test report of Auto-writing standard form, so as to which finished item detects.The test mould artificially selected is needed in the prior art Block, artificially throw the soft pressing plate moved back, the parameter setting artificially calculated, the testing time artificially controlled, the action message artificially read, The artificial test report filled in and arranged, can be automatically performed, very using intelligent substation local reaying protection test system Just accomplish " one-touch " test, greatly save manpower and time.To sum up, the present invention has manufactured the intelligent power transformation of complete set The distant check system of having a try of relay protection of standing, that is, when testing, by far controlling or being protected in local distant examination monitoring hands- operation to relay Shield tester is controlled, and is imported template, is tested and transferred report.For protective device inspection provide one standardization and Efficient solution can meet the demand of one-touch test of the user to protective device;Meanwhile realization optical fiber power, The automatic test of attenuation.Compared with conventional test methods, which can automatically be tested according to the testing scheme of editor, energy Enough automatic decision test results, can in standard Word report templates Auto-writing test record, automatically generate test report.
The distant check system of having a try of intelligent substation relay protection is applied not only to test whether that breaker and disconnecting switch can be controlled Division, be additionally operable to be automatically performed the transmission test of various protective devices, automatically generate test report.Such as relay protection is controlled to survey Examination instrument gives main transformer protection device dosage, and whether test transform er differential protection can correctly act, and whether trip boundary condition meets fixed Whether value, pressing plate function are correct.
In order to improve the testing efficiency of local control terminal, in order to further improve testing efficiency, local control terminal tool It is used for body according to different types of protective device, is previously stored with corresponding template file, which protects including each The detection project sequence and detection ordering of protection unit.After local side test enabled instruction is sent out, local control terminal can identify guarantor The type of protection unit, and detection project is performed one by one according to the detection ordering of corresponding protective device, detection project be used to indicate after Protective device is tested in the execution of electric protection tester.
Due to the definite value that different test events are related to and soft pressing plate difference, in automatic testing process, local control is eventually End can change protective device definite value automatically according to different test events and soft pressing plate is moved back in throwing.Protection dress can be specifically read first Configuration information is put, which includes the definite value of protective device, soft pressing plate, and carries out backup, and safety assurance is provided for test, At the end of test, configuration information can be compared again, if former configuration information is changed in test, then surveying After examination, the backup before restoring automatically.
If detection project is the project manually completed, local control terminal can carry out information alert to instruct to use to user Family is completed and the relevant operation of the detection project, after the completion of operation, continues to test by after continued key, so as to complete entirely to test Process.If detection project is relay protective scheme test event, local control terminal can set test parameter automatically and relay is controlled to protect It protects tester and completes test, local control terminal can also obtain the action message of protection automatically, automatic decision test result, and The test report of Auto-writing standard form, so as to which finished item detects.
Due to there are many protective devices in substation, for the ease of testing a variety of protective devices, in others In implementation, relay-protection tester includes identification device and test device;Identification device is used for identification protecting device type, identification The input/output terminal of device and the input/output terminal of protective device connect;The input terminal of test device and the output terminal of identification device Connection, the output terminal of the output terminal of test device as relay protection instrument, connect with the test interface of protective device.Test device Quantity can be multiple, the type of multiple test devices and protective device corresponds, the output terminal of identification device with it is multiple The chip select terminal connection of test device, so as to which the test to certain protective device be rapidly completed.
In conclusion the present invention can by the distant test for having a try check system protective device of intelligent substation relay protection Can be completed in remote side and local side, the convenience of protective device test is improved, enhances what protective device was tested Safety improves the rapidity of a variety of protective device tests, improves testing efficiency when being debugged to protective device.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.

Claims (8)

1. a kind of distant check system of having a try of intelligent substation relay protection, which is characterized in that the intelligent substation relay protection is distant Check system of having a try includes:Remote control terminal, relay-protection tester, interchanger and local control terminal;
The remote control terminal has the distant place control system for issuing test initiation command and connects with the distant place control system The telecontrol communication machine connect;
The relay-protection tester is arranged in intelligent substation, and the Enable Pin of the relay-protection tester passes through the friendship It changes planes and is connect with the telecontrol communication machine, to receive the test initiation command of the telecontrol communication machine transmission, the relay-protection tester Multiple output terminals are connect one by one with the test interface of a variety of protective devices in the intelligent substation, the relay protection test The input terminal of instrument is connect by the interchanger with the network interface of a variety of protective devices, to identify that protection to be tested fills It puts;
The local control terminal is arranged in the intelligent substation, and the first output terminal of the local control terminal passes through institute The Enable Pin that interchanger is stated with the relay-protection tester is connect;
The distant place control system is used to, according to different types of protective device, be previously stored with corresponding template file, described Template file includes the detection project sequence and detection ordering of each protective device;
After the test initiation command is sent out, the distant place control system identifies the type of protective device, and is protected according to corresponding The detection ordering of protection unit performs detection project one by one, and the detection project is used to indicate the relay-protection tester execution pair The protective device is tested.
2. the distant check system of having a try of intelligent substation relay protection according to claim 1, which is characterized in that the long-range control Terminal processed further includes the first fingerprint machine, and the output terminal of first fingerprint machine is connect with the start end of the distant place control system.
3. the distant check system of having a try of intelligent substation relay protection according to claim 1, which is characterized in that the local control Terminal processed includes the second fingerprint machine and monitoring equipment, and the output terminal of second fingerprint machine is connect with the start end of the monitoring equipment, First output terminal of first output terminal of the monitoring equipment for the local control terminal.
4. the distant check system of having a try of intelligent substation relay protection according to claim 3, which is characterized in that the local control Terminal processed further includes printer, and the input terminal of the printer is connect with the second output terminal of the monitoring equipment, the monitoring equipment Second output terminal of the second output terminal for the local control terminal.
5. the distant check system of having a try of intelligent substation relay protection according to claim 1, which is characterized in that the relay is protected Shield tester is connect by optical fiber with the protective device.
6. the distant check system of having a try of intelligent substation relay protection according to claim 1, which is characterized in that the protection dress The output terminal put is connect by optical fiber with the intelligent terminal of the intelligent substation, and the intelligent terminal passes through cable and the intelligence The breaker of energy substation is connected with disconnecting switch.
7. the distant check system of having a try of intelligent substation relay protection according to claim 1, which is characterized in that the distant place control System processed can also read original configuration information of protective device, and the configuration information includes the definite value of the protective device and soft pressure Plate, and carry out backup;
At the end of test, the configuration information of protective device can be compared again, if test is to described original with confidence Breath is changed, then after test, the backup before restoring automatically.
8. the distant check system of having a try of intelligent substation relay protection according to claim 7, which is characterized in that if the detection Project is the project manually completed, then the distant place control system can to user carry out information alert with instruct user complete with The detection project relevant operation after the completion of operation, continues to test by after continued key, so as to complete entire test process.
CN201510784668.4A 2015-11-16 2015-11-16 The distant check system of having a try of intelligent substation relay protection Active CN105388416B (en)

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Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106124879A (en) * 2016-05-26 2016-11-16 国网浙江省电力公司嘉兴供电公司 A kind of multifunctional relay protection equipment test go-cart
CN107132435B (en) * 2017-04-16 2019-10-18 国网浙江省电力公司紧水滩水力发电厂 A kind of power plant protective relaying device remote diagnosis system and diagnostic method
CN107942279A (en) * 2017-12-13 2018-04-20 国网江苏省电力有限公司电力科学研究院 Voltage transformer scene movable detecting platform and detection method in energy metering device
CN108508291A (en) * 2018-03-13 2018-09-07 云南电网有限责任公司电力科学研究院 A kind of direct current protecting function detecting method and system
CN108181537A (en) * 2018-03-13 2018-06-19 云南电网有限责任公司电力科学研究院 A kind of protective device automatic testing method and system
CN109507574A (en) * 2018-11-19 2019-03-22 国网新疆电力有限公司塔城供电公司 The test method and device of relay protection device
CN110633901A (en) * 2019-09-03 2019-12-31 国网河北省电力有限公司 Intelligent substation relay protection device operation situation perception and remote maintenance system
CN112134351B (en) * 2020-08-21 2022-09-06 国网山东省电力公司临沂供电公司 Remote telemetry acceptance system and method based on transformer substation distribution network

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102064612B (en) * 2011-01-13 2013-05-22 许继电气股份有限公司 System and method for maintaining condition of relay protection
CN102694366A (en) * 2011-03-24 2012-09-26 辽宁省电力有限公司朝阳供电公司 Remote monitoring apparatus for disconnection of replaying protection outlet tripping circuit
CN102594910B (en) * 2012-03-15 2014-12-10 天津市电力公司 Method adopting data service bus to realize single-instance transformer station programmed processing
CN104009547B (en) * 2014-06-13 2016-05-04 国家电网公司 Breaker remote operation function monitoring arrangement and transformer station's remote operation system
CN204116558U (en) * 2014-10-17 2015-01-21 浙江开关厂有限公司 A kind of isolating switch on-Line Monitor Device
CN204287418U (en) * 2014-12-09 2015-04-22 潍坊五洲浩特电气有限公司 A kind of circuit breaker switch state pick-up unit
CN205139323U (en) * 2015-11-16 2016-04-06 国家电网公司 Distant examination testing system of intelligent substation relay protection

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