CN202649370U - PT (potential transformer) secondary loop multipoint grounding online monitor - Google Patents
PT (potential transformer) secondary loop multipoint grounding online monitor Download PDFInfo
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- CN202649370U CN202649370U CN 201220311316 CN201220311316U CN202649370U CN 202649370 U CN202649370 U CN 202649370U CN 201220311316 CN201220311316 CN 201220311316 CN 201220311316 U CN201220311316 U CN 201220311316U CN 202649370 U CN202649370 U CN 202649370U
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- Prior art keywords
- pulpit
- secondary circuit
- point
- lightning arrester
- milliammeter
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Abstract
The utility model relates to a PT (potential transformer) secondary loop multipoint grounding online monitor which comprises a control chamber one-point grounding connecting wire (1) of a PT secondary loop, a lightning arrester F, a milliammeter A, a small disconnecting link K and a slide-wire rheostat R. The control chamber one-point grounding connecting wire (1) is connected between a control chamber zero phase N600 of the PT secondary loop and a secondary equipotential ground screen B, the milliammeter A, the small disconnecting link K and the slide-wire rheostat R are sequentially connected in series and then are connected in parallel with the control chamber one-point grounding connecting wire (1), and the lightning arrester F is connected between the control chamber zero phase N600 and the secondary equipotential ground screen B. The PT secondary loop multipoint grounding online monitor has the advantage that the online monitor can accurately judge hidden trouble of multipoint grounding and provide technical support for troubleshooting the hidden trouble of relay protection on the premise of ensuring the running PT secondary loop not to lose grounding points without affecting normal operation of the online monitor.
Description
Technical field
The utility model relates to a kind of PT secondary circuit multipoint earthing on-line monitoring instrument.
Background technology
Transformer station has occured a lot of because the example of the protection malfunction that PT secondary circuit multipoint earthing causes at present; the PT secondary circuit multipoint earthing occurs owing to transformer station's reorganization and expansion causes; for such problem; existing LT-N600 PT multipoint earth faults orientator need to add electric signal to the PT secondary circuit; judge with the variation that detects this signal whether the PT secondary circuit multipoint earthing has occured; this electric signal can cause interference to the protection equipment of operation; affect its normal operation, may cause the malfunction and movement resistance of protection equipment.Therefore, need a kind of equipment that the PT secondary circuit does not lose earth point and do not affect the on-line monitoring PT secondary circuit multipoint earthing of the normal operation of protection equipment that can guarantee to move.
The utility model content
Technical problem to be solved in the utility model provides a kind of PT secondary circuit guaranteeing operation and does not lose earth point and do not affect under the prerequisite that protection equipment normally moves, and can accurately judge the PT secondary circuit multipoint earthing on-line monitoring instrument of multipoint earthing hidden danger.
The technical scheme that the utility model adopts for its technical matters:
The utility model is comprised of pulpit one point earth connecting line, lightning arrester F, milliammeter A, pocket knife lock K and the rheochord R of PT secondary circuit; Described pulpit one point earth connecting line is connected between the pulpit zero phase N600 and secondary equipotential earth mat B of PT secondary circuit; It is in parallel with described pulpit one point earth connecting line after described milliammeter A, pocket knife lock K and rheochord R connect successively; Described lightning arrester F is connected between pulpit zero phase N600 and the secondary equipotential earth mat B.
Described lightning arrester F adopts low-voltage ZnO lightning arrester, and its voltage breakdown is 380V.
The Standard resistance range of described rheochord R is 0-10 Ω; The precision of described milliammeter A is 1mA, and range is 0-100 mA; The rated voltage of described pocket knife lock K is more than the 220V, and rated current is more than the 20A.
The beneficial effects of the utility model are as follows:
Feasible in the substation field simulated experiment, do not lose earth point and do not affect under the prerequisite that protection equipment normally moves at the PT secondary circuit that guarantees operation, can accurately judge the hidden danger of multipoint earthing, provide technical guarantee to the relay protection hidden troubles removing.
Description of drawings
Fig. 1 is the circuit theory diagrams of PT secondary circuit multipoint earthing on-line monitoring instrument.
Fig. 2 is the equivalent circuit diagram of PT secondary circuit one point earth.
Fig. 3 is the equivalent circuit diagram of 2 ground connection of PT secondary circuit.
In Fig. 1-3,1 for pulpit one point earth connecting line, the F of PT secondary circuit be that lightning arrester, A are that milliammeter, K are that little disconnecting link, R are that rheochord, C are over the ground distributed capacitance, U of PT secondary circuit cable
1For threshold voltage, the O such as PT secondary are that one point earth point, the F of substation PT secondary loop in the pulpit is another earth point, the U of substation PT secondary loop except the one point earth point O of pulpit
2Be electric potential difference, the R that exists on secondary equipotential ground between earth point O and the earth point F on the net
fBe the cable resistance between earth point O and the earth point F.
Embodiment
By embodiment shown in Figure 1 as can be known, the utility model is comprised of pulpit one point earth connecting line 1, lightning arrester F, milliammeter A, pocket knife lock K and the rheochord R of PT secondary circuit; Described pulpit one point earth connecting line 1 is connected between the pulpit zero phase N600 and secondary equipotential earth mat B of PT secondary circuit; It is in parallel with described pulpit one point earth connecting line 1 after described milliammeter A, pocket knife lock K and rheochord R connect successively; Described lightning arrester F is connected between pulpit zero phase N600 and the secondary equipotential earth mat B.
Described lightning arrester F adopts low-voltage ZnO lightning arrester, and its voltage breakdown is 380V.
The Standard resistance range of described rheochord R is 0-10 Ω; The precision of described milliammeter A is 1mA, and range is 0-100 mA; The rated voltage of described pocket knife lock K is more than the 220V, and rated current is more than the 20A.
The pulpit one point earth connecting line 1 of described PT secondary circuit is 4mm
2The multiply annealed copper wire; The effect of described lightning arrester F is to prevent because after a variety of causes PT secondary circuit loses earth point, to secondary equipotential earth mat B potential rise, the crisis person and device security are after lightning arrester F punctures, the PT secondary circuit meets secondary equipotential earth mat B again, thereby has guaranteed the person and device security; The effect of described milliammeter A is the electric current of measuring branch road.
The using method of present embodiment:
Termination secondary equipotential earth mat B with rheochord R, the end of milliammeter A is linked to each other with pulpit zero phase N600, disconnecting link K closes, take the pulpit one point earth connecting line 1 of PT secondary circuit apart, the resistance of regulating rheochord R changes between 0-10 Ω, electric current on the rheochord R is observed the current value of namely observing milliammeter A change, show if the current value of milliammeter A changes to have multipoint earthing, otherwise do not have multipoint earthing.
When there is one point earth in the pulpit of PT secondary circuit zero phase N600 (referring to Fig. 2), the PT secondary circuit cable is distributed capacitance C, the equivalent voltage U of PT secondary over the ground
1Form the loop with the pulpit one point earth connecting line 1 of PT secondary circuit.C is very little for distributed capacitance, is high impedance, capacitor C capacitive reactance and U
1Determine the size of loop current I.Slide wire resistor R is connected in parallel at pulpit one point earth connecting line 1 place, after taking pulpit one point earth connecting line 1 apart, because of R＜＜(1/jwC), so change the resistance (less than 10 Ω) of slide wire resistor R, do not affect loop current I, the size of I remains unchanged.
When existing multipoint earthing, the pulpit of PT secondary circuit zero phase N600 (analyzes as an example of 2 ground connection example, referring to Fig. 3), the substation PT secondary loop also has earth point F except 1 the O ground connection in pulpit, and there is electric potential difference U in two earth points at secondary equipotential earth mat B
2, the cable resistance of establishing between earth point F and the earth point O is R
f, R
fStandard resistance range be 1-5 Ω; Slide wire resistor R is connected in parallel at pulpit one point earth connecting line 1 place; After taking pulpit one point earth connecting line 1 apart, can be drawn by Fig. 3: I=U
2/ (R+R
f).When R=0 Ω, I=U
2/ R
f, when R=10 Ω, I=U
2/ (R+R
f), because the Standard resistance range of rheochord R is 0-10 Ω; When therefore rheochord R being transferred to 10 Ω by 0 Ω, electric current I will significantly reduce.
Hence one can see that, and changing impact on current value by loop resistance, can to judge whether to exist multipoint earthing be feasible in theory.
The present embodiment on-site verification: simulation test can be carried out in conjunction with 10KV II section full cut-off just at comprehensive reformation in the Dong Si station in the recent period.Zero phase N600 at PT cabinet place adds 0.05V voltage, at 10KV562 shunt PT secondary circuit place, zero phase N600 is linked to each other with secondary equipotential earth mat B, at 10KV public testing screen place, the end of milliammeter A of the present utility model is linked to each other with pulpit zero phase N600, termination secondary equipotential earth mat B with rheochord R, pocket knife lock K closes, disconnect pulpit one point earth connecting line 1, rheochord R is transferred to 10 Ω by 0 Ω, current value has become 5mA by 50mA, and explanation this moment exists and also have other earth point except the one point earth of pulpit; Take the grounding connection line at 562 shunt PT secondary circuit places apart, rheochord R is transferred to 10 Ω by 0 Ω, current value is almost nil, and does not change, and this moment, there was not multipoint earthing in explanation.Repeatedly test, the result is unified.
Claims (3)
1. a PT secondary circuit multipoint earthing on-line monitoring instrument is characterized in that being comprised of pulpit one point earth connecting line (1), lightning arrester F, milliammeter A, pocket knife lock K and the rheochord R of PT secondary circuit; Described pulpit one point earth connecting line (1) is connected between the pulpit zero phase N600 and secondary equipotential earth mat B of PT secondary circuit; It is in parallel with described pulpit one point earth connecting line (1) after described milliammeter A, pocket knife lock K and rheochord R connect successively; Described lightning arrester F is connected between pulpit zero phase N600 and the secondary equipotential earth mat B.
2. PT secondary circuit multipoint earthing on-line monitoring instrument according to claim 1 is characterized in that described lightning arrester F adopts low-voltage ZnO lightning arrester, and its voltage breakdown is 380V.
3. PT secondary circuit multipoint earthing on-line monitoring instrument according to claim 1, the Standard resistance range that it is characterized in that described rheochord R is 0-10 Ω; The precision of described milliammeter A is 1mA, and range is 0-100 mA; The rated voltage of described pocket knife lock K is more than the 220V, and rated current is more than the 20A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220311316 CN202649370U (en) | 2012-06-29 | 2012-06-29 | PT (potential transformer) secondary loop multipoint grounding online monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220311316 CN202649370U (en) | 2012-06-29 | 2012-06-29 | PT (potential transformer) secondary loop multipoint grounding online monitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202649370U true CN202649370U (en) | 2013-01-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220311316 Expired - Fee Related CN202649370U (en) | 2012-06-29 | 2012-06-29 | PT (potential transformer) secondary loop multipoint grounding online monitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202649370U (en) |
Cited By (6)
| 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 |
| CN103983895A (en) * | 2014-04-08 | 2014-08-13 | 广西电网公司电力科学研究院 | PT secondary circuit online N-line multipoint ground fault detection method and device |
| CN104777405A (en) * | 2015-04-30 | 2015-07-15 | 国家电网公司 | Passive voltage transformer secondary circuit N600 multipoint grounding finder and operation method thereof |
| 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 |
| CN105954642A (en) * | 2016-06-08 | 2016-09-21 | 国网山西省电力公司阳泉供电公司 | Portable PT one-point grounding tester |
| CN106772192A (en) * | 2016-12-12 | 2017-05-31 | 国家电网公司 | Secondary Circuit of Potential Transformer multipoint earthing detection means |
-
2012
- 2012-06-29 CN CN 201220311316 patent/CN202649370U/en not_active Expired - Fee Related
Cited By (8)
| 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 |
| CN103983895A (en) * | 2014-04-08 | 2014-08-13 | 广西电网公司电力科学研究院 | PT secondary circuit online N-line multipoint ground fault detection method and device |
| CN103983895B (en) * | 2014-04-08 | 2016-08-17 | 广西电网公司电力科学研究院 | The online N line multipoint earth faults detection method of PT secondary circuit |
| 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 |
| CN104777405A (en) * | 2015-04-30 | 2015-07-15 | 国家电网公司 | Passive voltage transformer secondary circuit N600 multipoint grounding finder and operation method thereof |
| CN104777405B (en) * | 2015-04-30 | 2018-07-31 | 国家电网公司 | Passive type Secondary Circuit of Potential Transformer N600 multipoint earthing locators and its operation method |
| CN105954642A (en) * | 2016-06-08 | 2016-09-21 | 国网山西省电力公司阳泉供电公司 | Portable PT one-point grounding tester |
| CN106772192A (en) * | 2016-12-12 | 2017-05-31 | 国家电网公司 | Secondary Circuit of Potential Transformer multipoint earthing detection means |
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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: STATE ELECTRIC NET CROP. Free format text: FORMER OWNER: SHIJIAZHUANG POWER SUPPLY COMPANY Effective date: 20130410 Owner name: HEBEI ELECTRIC POWER CORPORATION SHIJIAZHUANG POWE Effective date: 20130410 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 050091 SHIJIAZHUANG, HEBEI PROVINCE TO: 100031 XICHENG, BEIJING |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20130410 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: Hebei Electric Power Corporation Patentee after: Shijiazhuang Power Supply Co.,Ltd. Address before: 050091 No. 529 South China Avenue, Hebei, Shijiazhuang Patentee before: Shijiazhuang Power Supply 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: 20130102 Termination date: 20180629 |