CN202533538U - A multipoint earthing searcher of a potential transformer - Google Patents
A multipoint earthing searcher of a potential transformer Download PDFInfo
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- CN202533538U CN202533538U CN2011205301736U CN201120530173U CN202533538U CN 202533538 U CN202533538 U CN 202533538U CN 2011205301736 U CN2011205301736 U CN 2011205301736U CN 201120530173 U CN201120530173 U CN 201120530173U CN 202533538 U CN202533538 U CN 202533538U
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- multipoint earthing
- circuit
- voltage transformer
- potential transformer
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- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 4
- 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
- 238000005259 measurement Methods 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 utility model discloses a multipoint earthing searcher of a potential transformer. The multipoint earthing searcher of a potential transformer comprises a microprocessor (1) connected with a power supply (2), a double liquid crystal display circuit (3), a keyboard input circuit (4), a storage circuit (5), and a measuring circuit (6) connected with a parallel input interface (7). The multipoint earthing searcher of a potential transformer compares detected current waveforms in ground wires at different locations so as to fast and accurately determine and find out multipoint earthing situations of the potential transformer, and has characteristics of easy manipulation, practicality and convenience, and safety and high efficiency, providing power generation enterprises and power supply enterprises with a safe and effective searching means for multipoint earthing fault of the potential transformer and further maintaining safe and stable operation of electric power system.
Description
Technical field
The utility model relates to dc system fault checkout equipment field, and 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.
The utility model content
The technical matters that the utility model 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 utility model 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 two-stage calculation amplifying 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 beneficial effect of the utility model is: the utility model voltage transformer (VT) multipoint earthing 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 embodiment of accompanying drawing the utility model:
Fig. 1 is the theory diagram that the utility model voltage transformer (VT) multipoint earthing is searched appearance;
Fig. 2 is that the utility model voltage transformer (VT) multipoint earthing is searched the circuit theory diagrams of metering circuit in the appearance;
Fig. 3 is the circuit theory diagrams that the utility model voltage transformer (VT) multipoint earthing is searched the brilliant display circuit of biliquid in the appearance;
Fig. 4 is that the utility model voltage transformer (VT) multipoint earthing is searched the application principle figure in the appearance application implementation example;
Fig. 5 is that the utility model voltage transformer (VT) multipoint earthing is searched the waveform of appearance display circuit and the exemplary plot of data presentation;
Fig. 6 is the exemplary plot that the utility model voltage transformer (VT) multipoint earthing 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 through raise accordingly handle and the processing and amplifying of two-stage calculation amplifying circuit after; Be transferred to the AD thief hatch of microprocessor 1, said two-stage calculation amplifying circuit adopts operational amplifier A D8552.
As the preferred implementation of the utility model, 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 utility model preferred embodiment, 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:
The current signal that each phase unbalance voltage VA, VB, VC and phase place cause;
And Ic, Ic is the capacitance current that cable screening wire or other reasons cause, 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 imaginary earth point ground connection is arranged on the PT2 ground wire, between this imagination earth point and the ground N600 some distances are arranged, epd causes having electric current I to produce.
Insert the input interface arranged side by side 7 that the utility model is searched 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 utility model 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 utility model is searched 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 to the utility model specifies; But the utility model is created and 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 the utility model spirit, 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 two-stage calculation amplifying 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 arbitrary 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 |
|---|---|---|---|
| CN2011205301736U CN202533538U (en) | 2011-12-19 | 2011-12-19 | A multipoint earthing searcher of a potential transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205301736U CN202533538U (en) | 2011-12-19 | 2011-12-19 | A multipoint earthing searcher of a potential transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202533538U true CN202533538U (en) | 2012-11-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205301736U Expired - Fee Related CN202533538U (en) | 2011-12-19 | 2011-12-19 | A multipoint earthing searcher of a potential transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202533538U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565608A (en) * | 2011-12-19 | 2012-07-11 | 甘肃省电力公司金昌供电公司 | Multipoint grounding seeking instrument of voltage transformer |
| CN103295617A (en) * | 2013-05-08 | 2013-09-11 | 惠州中城电子科技有限公司 | Method for rapidly solving faults of data collection equipment of electric system |
| CN103487713A (en) * | 2013-09-23 | 2014-01-01 | 国家电网公司 | Multipoint earthing trouble shooting equipment for substation voltage transformer secondary circuit |
-
2011
- 2011-12-19 CN CN2011205301736U patent/CN202533538U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565608A (en) * | 2011-12-19 | 2012-07-11 | 甘肃省电力公司金昌供电公司 | Multipoint grounding seeking instrument of voltage transformer |
| CN103295617A (en) * | 2013-05-08 | 2013-09-11 | 惠州中城电子科技有限公司 | Method for rapidly solving faults of data collection equipment of electric system |
| CN103487713A (en) * | 2013-09-23 | 2014-01-01 | 国家电网公司 | Multipoint earthing trouble shooting equipment for substation voltage transformer secondary circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: JINCHANG POWER SUPPLY COMPANY OF GANSU ELECTRIC PO Free format text: FORMER OWNER: GUANGZHOU QIANSHUN ELECTRONIC EQUIPMENT CO., LTD. Effective date: 20131105 Owner name: STATE ELECTRIC NET CROP. Free format text: FORMER OWNER: JINCHANG POWER SUPPLY COMPANY OF GANSU ELECTRIC POWER COMPANY Effective date: 20131105 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 737100 JINCHANG, GANSU PROVINCE TO: 100031 XICHENG, BEIJING |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20131105 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: Jinchang Power Supply Company of Gansu Electric Power Corporation Patentee after: Guangzhou Qianshun Electronic Equipment Co., Ltd. Address before: 737100 No. 78, Xinhua Road, Gansu, Jinchang Patentee before: Jinchang Power Supply Company of Gansu Electric Power Corporation Patentee before: Guangzhou Qianshun Electronic Equipment Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121114 Termination date: 20191219 |