CN202177675U - Voltage transformer secondary neutral point earthing monitoring device of transformer substation - Google Patents
Voltage transformer secondary neutral point earthing monitoring device of transformer substation Download PDFInfo
- Publication number
- CN202177675U CN202177675U CN2011202545601U CN201120254560U CN202177675U CN 202177675 U CN202177675 U CN 202177675U CN 2011202545601 U CN2011202545601 U CN 2011202545601U CN 201120254560 U CN201120254560 U CN 201120254560U CN 202177675 U CN202177675 U CN 202177675U
- Authority
- CN
- China
- Prior art keywords
- mutual inductor
- zero sequence
- transformer substation
- secondary neutral
- sequence current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a voltage transformer secondary neutral point earthing monitoring device of a transformer substation, which comprises a protection screen (1) of the transformer substation. A voltage transformer secondary neutral point (2) is connected to the protection screen (1), a one-point earth-return circuit (3) is connected with the voltage transformer secondary neutral point (2), a zero sequence current mutual inductor (4) is connected with the one-point earth-return circuit (3), and the secondary leading-out end of the zero sequence current mutual inductor (4) is connected with a current dial gauge mA. When earth faults occur, vector sum of current in various phases is not zero, fault current enables magnetic flow to be produced in a toroidal core of the zero sequence current mutual inductor, the secondary leading-out end of the zero sequence current mutual inductor enables the current dial gauge to change, so that the monitoring device can help operating and maintenance personnel to monitor whether multipoint earthing exists or not, thereby solving the problem well that the transformer substation lacks monitoring method on the return circuit, and guaranteeing normal operation of a transformer substation relay protection device.
Description
Technical field
The utility model relates to a kind of transformer substation voltage mutual inductor secondary neutral grounding monitoring device, belongs to the relay protection of power system technical field.
Background technology
This case is that example describes with 500kV transformer station; At present, 500kV transformer substation voltage mutual inductor secondary neutral (N600) ground loop does not have effective monitoring means, when 500kV transformer substation voltage mutual inductor secondary neutral (N600) when having multipoint earthing; The line short fault takes place; Fault current circulates in earth mat and forms voltage, and this voltage into secondary neutral that superposes causes the phase voltage of protective relaying device impression to distort; Cause protective relaying device tripping or malfunction, form power grid accident.Because of no monitoring device, at present often after accident takes place, just one by one at interval power failure search unnecessary secondary earth point; So not only need spend lot of manpower and material resources; Increased the power off time of equipment simultaneously, had influence on the safe operation of electrical network, solved so something must be done to.
The utility model content
The technical matters that the utility model will solve provides a kind of simple in structure, and the transformer substation voltage mutual inductor secondary neutral grounding monitoring device that can monitor, report to the police the electric current of secondary neutral ground loop in real time can overcome the deficiency of prior art.
The technical scheme of the utility model is: it comprises the protection screen of transformer station; On protection screen, be connected with the voltage transformer secondary neutral point; On the voltage transformer secondary neutral point, be connected with the one point earth loop; Be connected with zero sequence current mutual inductor on the ground loop on one point, on the secondary exit of zero sequence current mutual inductor, be connected with electric current indicating gauge mA.
On the secondary exit of zero sequence current mutual inductor, be connected with the warning contact, the warning contact is connected with warning device.
Described warning device is the observing and controlling screen.
Compare with prior art; The utility model is through be connected with zero sequence current mutual inductor on the ground loop on one point; On the secondary exit of zero sequence current mutual inductor, be connected with electric current indicating gauge mA, the vector of each phase current when earth fault takes place and non-vanishing, fault current make in the annular core of zero sequence current mutual inductor and produce magnetic flux; The secondary exit of zero sequence current mutual inductor changes the electric current indicating gauge; Thereby help the operation maintenance personnel whether to exist multipoint earthing to implement to keep watch on, well solved the problem of transformer station, guaranteed the normal operation of substation relay protection device this loop shortage monitoring means to secondary neutral.On the secondary exit of zero sequence current mutual inductor, be connected with the warning contact, the warning contact is connected with warning device, can help the operation maintenance personnel to judge whether earth point increases so more intuitively.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Embodiment
Embodiment: as shown in Figure 1; On protection screen 1, be connected with voltage transformer secondary neutral point 2, on voltage transformer secondary neutral point 2, be connected with one point earth loop 3, be connected with zero sequence current mutual inductor 4 (cannula C T) on one point on the ground loop 3; On the secondary exit of zero sequence current mutual inductor 4, be connected with electric current indicating gauge mA; Increasing simultaneously has warning contact 5, and warning contact 5 is connected with warning device 6, and described warning device 6 is the observing and controlling screen.
Claims (3)
1. transformer substation voltage mutual inductor secondary neutral grounding monitoring device; It comprises the protection screen (1) of transformer station; On protection screen (1), be connected with voltage transformer secondary neutral point (2); On voltage transformer secondary neutral point (2), be connected with one point earth loop (3), it is characterized in that: be connected with zero sequence current mutual inductor (4) on the ground loop (3) on one point, on the secondary exit of zero sequence current mutual inductor (4), be connected with electric current indicating gauge mA.
2. transformer substation voltage mutual inductor secondary neutral grounding monitoring device according to claim 1; It is characterized in that: on the secondary exit of zero sequence current mutual inductor (4), be connected with warning contact (5), warning contact (5) is connected with warning device (6).
3. transformer substation voltage mutual inductor secondary neutral grounding monitoring device according to claim 1 is characterized in that: described warning device (6) is the observing and controlling screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202545601U CN202177675U (en) | 2011-07-19 | 2011-07-19 | Voltage transformer secondary neutral point earthing monitoring device of transformer substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202545601U CN202177675U (en) | 2011-07-19 | 2011-07-19 | Voltage transformer secondary neutral point earthing monitoring device of transformer substation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202177675U true CN202177675U (en) | 2012-03-28 |
Family
ID=45867549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202545601U Expired - Fee Related CN202177675U (en) | 2011-07-19 | 2011-07-19 | Voltage transformer secondary neutral point earthing monitoring device of transformer substation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202177675U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105182046A (en) * | 2015-09-25 | 2015-12-23 | 深圳供电局有限公司 | Current voltage transformer secondary neutral grounding current acquisition device |
| CN113447705A (en) * | 2021-06-21 | 2021-09-28 | 深圳供电局有限公司 | Device and method for keeping secondary neutral point of voltage transformer grounded |
-
2011
- 2011-07-19 CN CN2011202545601U patent/CN202177675U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105182046A (en) * | 2015-09-25 | 2015-12-23 | 深圳供电局有限公司 | Current voltage transformer secondary neutral grounding current acquisition device |
| CN113447705A (en) * | 2021-06-21 | 2021-09-28 | 深圳供电局有限公司 | Device and method for keeping secondary neutral point of voltage transformer grounded |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120328 Termination date: 20140719 |
|
| EXPY | Termination of patent right or utility model |