CN102565608A - Multipoint grounding seeking instrument of voltage transformer - Google Patents
Multipoint grounding seeking instrument of voltage transformer Download PDFInfo
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- CN102565608A CN102565608A CN2011104243210A CN201110424321A CN102565608A CN 102565608 A CN102565608 A CN 102565608A CN 2011104243210 A CN2011104243210 A CN 2011104243210A CN 201110424321 A CN201110424321 A CN 201110424321A CN 102565608 A CN102565608 A CN 102565608A
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- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 4
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000010248 power generation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000006386 memory function Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
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Abstract
The invention discloses a multipoint grounding seeking instrument of a voltage transformer, which comprises a microprocessor (1), wherein the microprocessor (1) is respectively connected with a power source (2), double liquid crystal display circuits (3), a keyboard input circuit (4), a storage circuit (5) and a measurement circuit (6) further connected with a paralleling input interface (7). By comparing current waveforms detected in grounding wires at different positions, the multipoint grounding seeking instrument of the voltage transformer can judge and find out situations of multipoint grounding of the voltage transformer quickly and accurately, is simple in operation, practical, convenient, safe and efficient, provides a safe and efficient seeking means for multipoint grounding faults of the voltage transformer for vast power generation and supply enterprises, and further guarantees safe and stable operation of a power system.
Description
Technical field
The present invention relates to dc system fault checkout equipment field, especially a kind of voltage transformer (VT) multipoint earthing is searched appearance.
Background technology
" relay protection of power system and automatic safety device anti-accident measures main points " regulation, several groups of voltage transformer secondary loops that zero mutually little bus (N600) is communicated with through the pulpit only should be in the pulpit with the N600 one point earth.If there are two point (or multiple spot) ground connection in the voltage transformer secondary loop, measured voltage is fallen and is affected, and can make measurement inaccurate under the serious situation, causes the malfunction of protective device.
In the recent period; South electric network recurs two because 220kV and the above protection malfunction incident that protective voltage transformer, secondary circuit multipoint earthing causes; For preventing the generation once more of this type of accident, net total accent the in south issued " about preventing the notice of generating plant transforming plant protecting with voltage transformer secondary circuit multipoint earthing ".
Notice explicitly calls for the voltage transformer secondary loop to need by following principle ground connection, and requires to measure every half a year a PT and whether have multipoint earthing, finds multipoint earthing, must search and get rid of the earth fault beyond the N600 immediately:
1, several groups of voltage transformer secondary loops that zero mutually little bus (N600) is communicated with through the pulpit only should be in the pulpit with (N600) one point earth;
2,, must guarantee no any electrical communication between the voltage transformer secondary loop of each electric pressure for each electric pressure N600 situation of ground connection respectively.
Therefore, need exploitation is a kind of can judge fast whether the PT loop exists the multipoint earthing fault badly, also can discern the voltage transformer (VT) multipoint earthing of the branch road that has multipoint earthing rapidly and search appearance.
Summary of the invention
The technical matters that the present invention will solve is: provide a kind of voltage transformer (VT) multipoint earthing simple to operate to search appearance.
In order to solve the problems of the technologies described above, the technical scheme that the present invention adopted is:
A kind of voltage transformer (VT) multipoint earthing is searched appearance, comprises a microprocessor, and said microprocessor is connected with power supply, the brilliant display circuit of biliquid, keyboard input circuit, memory circuit and metering circuit respectively, and said metering circuit also is connected with an input interface arranged side by side.
Further as preferred embodiment, said metering circuit comprises the two-stage calculation amplifying circuit, and the output signal of said two-stage calculation amplifying circuit is transferred to the AD thief hatch of microprocessor.
Further as preferred embodiment, said operational amplification circuit adopts operational amplifier A D8552.
Further as preferred embodiment, said microprocessor is the MSP430F5438 single-chip microcomputer.
Further as preferred embodiment, the brilliant display circuit of said biliquid is the 240*160-COG low power consumption liquid crystal.
Further as preferred embodiment, said memory circuit is the USB flash disk storer.
Further as preferred embodiment, said input interface arranged side by side is four tunnel input interfaces arranged side by side, is connected with 1 ~ 4 clamp on amperemeter simultaneously through this four tunnel input interface arranged side by side.
The invention has the beneficial effects as follows: voltage transformer (VT) multipoint earthing of the present invention is searched appearance through the current waveform that detects in the diverse location place ground wire is compared; Thereby judge and find out the situation of voltage transformer (VT) multipoint earthing fast and accurately; And it is simple to operate, practical and convenient and safe and efficient; For vast power generation or supply enterprise provides a kind of safe and effective voltage transformer (VT) multipoint earthing troubleshooting means, further ensured the power system safety and stability operation.
Description of drawings
Be described further below in conjunction with the accompanying drawing specific embodiments of the invention:
Fig. 1 is the theory diagram that voltage transformer (VT) multipoint earthing of the present invention is searched appearance;
Fig. 2 is that voltage transformer (VT) multipoint earthing of the present invention is searched the circuit theory diagrams of metering circuit in the appearance;
Fig. 3 is the circuit theory diagrams that voltage transformer (VT) multipoint earthing of the present invention is searched the brilliant display circuit of biliquid in the appearance;
Fig. 4 is that voltage transformer (VT) multipoint earthing of the present invention is searched the application principle figure in the appearance application implementation example;
Fig. 5 is that voltage transformer (VT) multipoint earthing of the present invention is searched the waveform of appearance display circuit and the exemplary plot of data presentation;
Fig. 6 is the exemplary plot that voltage transformer (VT) multipoint earthing of the present invention is searched appearance display circuit waveform and data contrast.
Embodiment
With reference to Fig. 1; A kind of voltage transformer (VT) multipoint earthing is searched appearance; Comprise a microprocessor 1, said microprocessor 1 is connected with power supply 2, the brilliant display circuit 3 of biliquid, keyboard input circuit 4, memory circuit 5 and metering circuit 6 respectively, and said metering circuit 6 also is connected with an input interface 7 arranged side by side.
With reference to Fig. 2; Said metering circuit 6 comprises the two-stage calculation amplifying circuit; The current signal of forcipated mutual-inductor induction is transferred to the AD thief hatch of microprocessor 1, said operational amplification circuit employing operational amplifier A D8552 through after raising the processing and amplifying of handling with the two-stage calculation amplifying circuit accordingly.
As preferred implementation of the present invention, said microprocessor 1 is the MSP430F5438 single-chip microcomputer.
With reference to Fig. 3, the brilliant display circuit 3 of said biliquid adopts two the same 240*160-COG low power consumption liquid crystals, receives single-chip microcomputer IO mouth to control the shared data mouth respectively.
In the preferred embodiment of the present invention, said memory circuit 5 is the USB flash disk storer, the user can self-defined storage relevant waveform and data file, and in the USB flash disk storer, read associated documents; Said input interface arranged side by side 7 is four tunnel input interfaces arranged side by side, is connected with 1 ~ 4 clamp on amperemeter simultaneously through this four tunnel input interface arranged side by side.
When detecting the voltage transformer (VT) multipoint earthing; Start; With clamp on amperemeter vise the voltage transformer (VT) ground wire that will detect, select the PT earthing searching--earthing searching, instrument begin to detect current signal and display waveform and the data in the current ground wire automatically.If the waveform at same group of line two ends should be the same basically with data, otherwise be exactly that multipoint earthing exists.The user can select memory function to store the waveform and the data of current measurement with USB flash disk, also can read the waveform of having stored with read out function, respectively at two screen displays, is convenient to contrast.
The on-the-spot synoptic diagram of voltage transformer (VT) multipoint earthing is as shown in Figure 4:
Should only there be two kinds of electric currents in the ground wire of PT1 in Fig. 4:
A: the current signal that each phase unbalance voltage and phase place cause;
B:Ic, Ic are the capacitance current that cable screening wire or other reasons cause, and this electric capacity is very little, so Ic is very little, apparatus measures is very little to I4 and I5.
Suppose as shown in Figure 4ly, an illusion earth point ground connection is arranged on the PT2 ground wire, between two ground some distances are arranged, epd causes having electric current I to produce.
Insert the input interface arranged side by side 7 that the present invention searches appearance to 4 forcipated mutual-inductors; At the I3 place big current signal should be arranged, search toward the PT2 terminal along current signal, current signal exists to the I2 place; Current signal disappears to the I1 place, so earth point is present between I1 and the I2.
Waveform and the data presentation of I3 are as shown in Figure 5, can store by self-defined filename.
The data of I3 can be read, and compare with I2 or I1 then, and are as shown in Figure 6.
Through above-mentioned concrete application implementation example, confirmed that the present invention searches appearance and can search the multipoint earthing situation that voltage transformer (VT) exists rapidly and accurately, and in the earthing searching process, need not be electrically connected with system under test (SUT).The present invention searches the situation that appearance can find out the voltage transformer (VT) multipoint earthing easily and efficiently, to improve the performance of power system stability operation.
More than be that preferable enforcement of the present invention is specified; But the invention is not limited to said embodiment; Those of ordinary skill in the art can also make all equivalent variations or replacement under the prerequisite of spirit of the present invention, distortion that these are equal to or replacement all are included in the application's claim institute restricted portion.
Claims (7)
1. a voltage transformer (VT) multipoint earthing is searched appearance; It is characterized in that: comprise a microprocessor (1); Said microprocessor (1) is connected with power supply (2), the brilliant display circuit (3) of biliquid, keyboard input circuit (4), memory circuit (5) and metering circuit (6) respectively, and said metering circuit (6) also is connected with an input interface arranged side by side (7).
2. a kind of voltage transformer (VT) multipoint earthing according to claim 1 is searched appearance; It is characterized in that: said metering circuit (6) comprises the two-stage calculation amplifying circuit, and the output signal of said two-stage calculation amplifying circuit is transferred to the AD thief hatch of microprocessor (1).
3. a kind of voltage transformer (VT) multipoint earthing according to claim 2 is searched appearance, it is characterized in that: said operational amplification circuit adopts operational amplifier A D8552.
4. a kind of voltage transformer (VT) multipoint earthing according to claim 1 is searched appearance, it is characterized in that: said microprocessor (1) is the MSP430F5438 single-chip microcomputer.
5. a kind of voltage transformer (VT) multipoint earthing according to claim 1 is searched appearance, it is characterized in that: the brilliant display circuit of said biliquid (3) is the 240*160-COG low power consumption liquid crystal.
6. a kind of voltage transformer (VT) multipoint earthing according to claim 1 is searched appearance, it is characterized in that: said memory circuit (5) is the USB flash disk storer.
7. search appearance according to the described a kind of voltage transformer (VT) multipoint earthing of claim 1 ~ 6, it is characterized in that: said input interface arranged side by side (7) is four tunnel input interfaces arranged side by side, is connected with 1 ~ 4 clamp on amperemeter simultaneously through this four tunnel input interface arranged side by side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104243210A CN102565608A (en) | 2011-12-19 | 2011-12-19 | Multipoint grounding seeking instrument of voltage transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104243210A CN102565608A (en) | 2011-12-19 | 2011-12-19 | Multipoint grounding seeking instrument of voltage transformer |
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| CN102565608A true CN102565608A (en) | 2012-07-11 |
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| CN2011104243210A Pending CN102565608A (en) | 2011-12-19 | 2011-12-19 | Multipoint grounding seeking instrument of voltage transformer |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323745A (en) * | 2013-06-21 | 2013-09-25 | 深圳供电局有限公司 | Method and device for monitoring and locating hidden defect of TV secondary neutral line for relay protection |
| CN103513150A (en) * | 2013-09-17 | 2014-01-15 | 广东电网公司东莞供电局 | Device and method for detecting multipoint earthing of voltage transformer for electric system |
| CN105467234A (en) * | 2015-11-18 | 2016-04-06 | 黑龙江大学 | Cell set voltage acquisition board tool tester |
| CN105589004A (en) * | 2014-10-13 | 2016-05-18 | 国家电网公司 | Method and device for judging substation relay protection-used PT secondary common circuit single-point grounding |
| CN106842098A (en) * | 2017-02-22 | 2017-06-13 | 国网甘肃省电力公司金昌供电公司 | A kind of voltage sensor of suitable substation field measurement |
| CN113945859A (en) * | 2021-09-08 | 2022-01-18 | 广西电网有限责任公司防城港供电局 | CT secondary side multipoint grounding searching instrument based on current comparison method |
| CN114035106A (en) * | 2021-10-19 | 2022-02-11 | 广西电网有限责任公司防城港供电局 | PT secondary side multipoint grounding fault finder based on multimode current measurement |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5973500A (en) * | 1996-06-14 | 1999-10-26 | Electricite De France-Service National | Apparatus for detecting insulation defects in devices connected into power distribution networks |
| CN101216543A (en) * | 2008-01-04 | 2008-07-09 | 广东省电力工业局试验研究所 | DC system earth fault detection and calibration method and its special equipment |
| CN201247298Y (en) * | 2008-08-18 | 2009-05-27 | 天津市电力公司 | Automatic recognizing instrument for relay protection differential vector |
| CN201812018U (en) * | 2010-10-12 | 2011-04-27 | 河南省电力公司新乡供电公司 | Multipoint grounding finding instrument of relay protector |
| CN202533538U (en) * | 2011-12-19 | 2012-11-14 | 甘肃省电力公司金昌供电公司 | A multipoint earthing searcher of a potential transformer |
-
2011
- 2011-12-19 CN CN2011104243210A patent/CN102565608A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5973500A (en) * | 1996-06-14 | 1999-10-26 | Electricite De France-Service National | Apparatus for detecting insulation defects in devices connected into power distribution networks |
| CN101216543A (en) * | 2008-01-04 | 2008-07-09 | 广东省电力工业局试验研究所 | DC system earth fault detection and calibration method and its special equipment |
| CN201247298Y (en) * | 2008-08-18 | 2009-05-27 | 天津市电力公司 | Automatic recognizing instrument for relay protection differential vector |
| CN201812018U (en) * | 2010-10-12 | 2011-04-27 | 河南省电力公司新乡供电公司 | Multipoint grounding finding instrument of relay protector |
| CN202533538U (en) * | 2011-12-19 | 2012-11-14 | 甘肃省电力公司金昌供电公司 | A multipoint earthing searcher of a potential transformer |
Non-Patent Citations (3)
| Title |
|---|
| 张海 等: "TV二次回路多点接地的查找方法", 《电工技术》 * |
| 费万民 等: "电力系统中直流接地电阻检测和接地故障点探测的方法研究", 《电工电能新技术》 * |
| 赵武智 等: "电压互感器二次回路一点接地检查及查找多个接地点方法", 《电力自动化设备》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323745A (en) * | 2013-06-21 | 2013-09-25 | 深圳供电局有限公司 | Method and device for monitoring and locating hidden defect of TV secondary neutral line for relay protection |
| CN103513150A (en) * | 2013-09-17 | 2014-01-15 | 广东电网公司东莞供电局 | Device and method for detecting multipoint earthing of voltage transformer for electric system |
| CN103513150B (en) * | 2013-09-17 | 2015-12-23 | 广东电网公司东莞供电局 | The pick-up unit of power system voltage mutual inductor multipoint earthing and method |
| CN105589004A (en) * | 2014-10-13 | 2016-05-18 | 国家电网公司 | Method and device for judging substation relay protection-used PT secondary common circuit single-point grounding |
| CN105467234A (en) * | 2015-11-18 | 2016-04-06 | 黑龙江大学 | Cell set voltage acquisition board tool tester |
| CN105467234B (en) * | 2015-11-18 | 2018-03-27 | 黑龙江大学 | A kind of battery voltage collection plate frock tester |
| CN106842098A (en) * | 2017-02-22 | 2017-06-13 | 国网甘肃省电力公司金昌供电公司 | A kind of voltage sensor of suitable substation field measurement |
| CN113945859A (en) * | 2021-09-08 | 2022-01-18 | 广西电网有限责任公司防城港供电局 | CT secondary side multipoint grounding searching instrument based on current comparison method |
| CN114035106A (en) * | 2021-10-19 | 2022-02-11 | 广西电网有限责任公司防城港供电局 | PT secondary side multipoint grounding fault finder based on multimode current measurement |
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Owner name: GUANGZHOU QIANSHUN ELECTRONIC EQUIPMENT CO., LTD. Free format text: FORMER OWNER: GUANGZHOU QIANSHUN ELECTRONIC EQUIPMENT CO., LTD. Effective date: 20130207 |
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Effective date of registration: 20130207 Address after: 737100 No. 78, Xinhua Road, Gansu, Jinchang Applicant after: Jinchang Power Supply Company of Gansu Electric Power Corporation Applicant after: Guangzhou Qianshun Electronic Equipment Co., Ltd. Applicant after: State Grid Corporation of China Address before: 737100 No. 78, Xinhua Road, Gansu, Jinchang Applicant before: Jinchang Power Supply Company of Gansu Electric Power Corporation Applicant before: Guangzhou Qianshun Electronic Equipment Co., Ltd. |
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Application publication date: 20120711 |