CN202210132U - Transformer substation's mutual-inductor secondary circuit one point ground connection detection device - Google Patents
Transformer substation's mutual-inductor secondary circuit one point ground connection detection device Download PDFInfo
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- CN202210132U CN202210132U CN2011203062162U CN201120306216U CN202210132U CN 202210132 U CN202210132 U CN 202210132U CN 2011203062162 U CN2011203062162 U CN 2011203062162U CN 201120306216 U CN201120306216 U CN 201120306216U CN 202210132 U CN202210132 U CN 202210132U
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Abstract
A transformer substation transformer secondary circuit one point grounding detection device comprises: a signal generator: a signal generator generates a direct current signal or a pulse signal, and the direct current signal or the pulse signal is injected into a grounding loop at the far end of a secondary loop of the mutual inductor; a signal detector: the signal detector detects a current value at each point in the ground loop. Because the signal generator generates a constant current source or a constant voltage source, when the measured current value has obvious deviation, the condition of wrong grounding near the position where the current value is reduced can be judged, and the condition can be found and eliminated in time, thereby ensuring the reliable operation of the transformer substation, preventing accidents and improving the safety of the transformer substation.
Description
Technical field
The utility model belongs to the power industry technical field of relay protection, is specifically related to a kind of transformer substation voltage transformer secondary circuit one point earth pick-up unit.
Background technology
In transformer station's industry, mutual inductor can change the big electric current or the big voltage of primary circuit into secondary circuit needed electric current and voltage through alternating flux as important electron power element very in the electric system.
After the insulation breakdown that prevents the both sides winding, introduce secondary circuit by the voltage of primary circuit, cause equipment and personal injury, in the secondary circuit side one point earth must be arranged at mutual inductor.Simultaneously, cause for fear of the sneak current that possibly exist between the electrical network and the incorrect operation of protective device must guarantee that the transformer secondary circuit side can only have one point earth.
For the whether real one point earth of transformer station's transformer secondary circuit, still do not have means that it is detected at present, only depend on the wiring when going into operation to guarantee.In case ground protection punctures or cable insulation damages ground connection, all can cause the multipoint earthing of secondary circuit, causes serious consequence.
The utility model content
The purpose of the utility model is to provide a kind of transformer station's transformer secondary circuit one point earth that can detect to detect transformer station's transformer secondary circuit one point earth pick-up unit, to guarantee transformer station's reliability service and to improve its security.
A kind of transformer station transformer secondary circuit one point earth pick-up unit comprises:
Signal generator: produce direct current signal or pulse signal by signal generator, at the far-end injection ground loop of transformer secondary circuit;
Signal detector: signal detector detects the current value at each point place in the ground loop.
Preferably, said signal generator comprises controller, controller output control signal after the digital to analog converter conversion, and the CS pipe is exported required control voltage.
Preferably, signal generator also comprises the analog to digital converter that links to each other with controller, is used for converting the ground loop magnitude of voltage into controller discernible digital signal.
Preferably, said signal detector comprises the direct current split-core type meter, and the direct current split-core type meter inputs to controller with detected current data after the analog to digital converter conversion, and controller is connected with the storer that is used for storage of measurement data.
Preferably, signal generator also comprises display device and the input media that links to each other with controller with signal detector.
Preferably, said direct current signal is a current source signal.
Adopt the described transformer station of the utility model transformer secondary circuit one point earth pick-up unit,,, measure the size of its current value at secondary ground loop each point place promptly away from the earth terminal input current signal at the far-end of transformer secondary circuit.Because signal generator produces constant current source or voltage source, when equipment was accurate one point earth, the current value at measured each point place should be for identical, and can reflect protective device by data measured this moment is the ground connection work of reliable place.When obvious deviation appears in measured current value size; Can judge current value diminish the position near the wrong ground connection situation of appearance, can in time find and get rid of, guarantee that transformer station moves reliably; Prevent the appearance of mishap, improve the security of transformer station.
Description of drawings
Fig. 1 is the utility model signal generator structural representation.
Fig. 2 is the utility model signal detector structural representation.
Fig. 3 is the secondary circuit synoptic diagram of the utility model test.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
Like Fig. 1 is the utility model signal generator structural representation.Signal generator is used for producing desired current with high accuracy source.Produce direct current signal or pulse signal by signal generator, to secondary ground loop situation, select for use current source scheme comparatively appropriate, sources is injected ground loop at the far-end of transformer secondary circuit; Signal generator comprises that controller, controller are connected with input button and display device, like LCD display etc., generally selects for use single-chip microcomputer to meet the demands, and controller output control signal is after the digital to analog converter conversion, and the CS pipe is exported required control voltage.
Fig. 2 is the utility model signal detector structural representation.Signal detector is used for detecting the current value at ground loop each point place.It comprises high-precision direct current split-core type meter, and resolution can reach 01mA, adopts the benefit of direct current split-core type meter to be unlike traditional current detecting equipment, need seal in tested loop to realize on-line measurement.The direct current split-core type meter inputs to controller with detected current data after the analog to digital converter conversion; Controller is connected with the storer that is used for storage of measurement data; Can store many group testing results and record monitoring circuit, after detection is accomplished, be uploaded to the situation that instantaneous multipoint earthing was further handled or found to computer.According to the practical application needs, also be connected with display device and input media, so that can in time show detection information, make things convenient for the staff to check.
The secondary circuit synoptic diagram that Fig. 3 tests for the utility model, R1, R2, R3 are respectively the resistance of three section leads in the branch road.D is for being connected on a little; At the A point; The far-end of secondary circuit (earth point) over the ground injects small electric current I by signal generator, and under normal circumstances (single-point grounding) flow through stream of earth lead AB section, BC section and CD section should equate, all be the current signal I of injection.If the earth point that in branch road, has other is such as the C point among the figure.R is a stake resistance, because the shunting action of R, the electric current of the CD section of the earth lead of flowing through must be not less than the current signal I of injection.Thus, when signal detector direct current split-core type meter detected current signal, the electric current that detects the CD section was less than the current signal of being doomed; Controller is judged it; Show its abnormal conditions by display, notify the staff in time to handle, in case mishap takes place.
In addition, signal generator also comprises the analog to digital converter that links to each other with controller, is used for converting the ground loop magnitude of voltage into controller discernible digital signal.When secondary circuit being carried out the ground connection detection, if detected magnitude of voltage is identical with output voltage values, can judge that then this moment, secondary circuit did not have ground connection, in time send display alarm by controller, the prompting staff in time investigates problem.
More than technical scheme that the utility model embodiment is provided carried out detailed introduction; Used concrete example among this paper principle and the embodiment of the utility model embodiment are set forth, the explanation of above embodiment only is applicable to the principle that helps to understand the utility model embodiment; Simultaneously, for one of ordinary skill in the art, according to the utility model embodiment, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as the restriction to the utility model.
Claims (7)
1. transformer station's transformer secondary circuit one point earth pick-up unit is characterized in that, comprising: signal generator: produce direct current signal or pulse signal by signal generator, at the far-end injection ground loop of transformer secondary circuit; Signal detector: signal detector detects the current value at each point place in the ground loop.
2. transformer station according to claim 1 transformer secondary circuit one point earth pick-up unit; It is characterized in that; Said signal generator comprises controller, controller output control signal after the digital to analog converter conversion, and the CS pipe is exported required control voltage.
3. transformer station according to claim 2 transformer secondary circuit one point earth pick-up unit is characterized in that, also comprises the analog to digital converter that links to each other with controller, is used for converting the ground loop magnitude of voltage into controller discernible digital signal.
4. transformer station according to claim 1 transformer secondary circuit one point earth pick-up unit; It is characterized in that; Said signal detector comprises the direct current split-core type meter; The direct current split-core type meter inputs to controller with detected current data after the analog to digital converter conversion, controller is connected with the storer that is used for storage of measurement data.
5. according to claim 2 or 4 described transformer station transformer secondary circuit one point earth pick-up units, it is characterized in that said controller is a single-chip microcomputer.
6. transformer station according to claim 4 transformer secondary circuit one point earth pick-up unit is characterized in that, also comprises the display device and the input media that link to each other with controller.
7. transformer station according to claim 1 transformer secondary circuit one point earth pick-up unit is characterized in that said direct current signal is a current source signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203062162U CN202210132U (en) | 2011-08-22 | 2011-08-22 | Transformer substation's mutual-inductor secondary circuit one point ground connection detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203062162U CN202210132U (en) | 2011-08-22 | 2011-08-22 | Transformer substation's mutual-inductor secondary circuit one point ground connection detection device |
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| CN202210132U true CN202210132U (en) | 2012-05-02 |
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| CN2011203062162U Expired - Fee Related CN202210132U (en) | 2011-08-22 | 2011-08-22 | Transformer substation's mutual-inductor secondary circuit one point ground connection detection device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197195A (en) * | 2013-03-29 | 2013-07-10 | 国家电网公司 | Detecting method and detecting system for multipoint earthing of voltage second loop neutral conductor network |
| CN103323745A (en) * | 2013-06-21 | 2013-09-25 | 深圳供电局有限公司 | Method and device for monitoring and positioning hidden defects of TV secondary neutral line for relay protection |
| 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 |
| CN103592564A (en) * | 2013-11-26 | 2014-02-19 | 国家电网公司 | Grounding judgment device of voltage transformer grounded neutral wire for protecting transformer substation |
| CN104360215A (en) * | 2014-11-12 | 2015-02-18 | 江苏省电力公司淮安供电公司 | Detection device for multi-point earthing fault of small bus N600 |
| 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 |
-
2011
- 2011-08-22 CN CN2011203062162U patent/CN202210132U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197195A (en) * | 2013-03-29 | 2013-07-10 | 国家电网公司 | Detecting method and detecting system for multipoint earthing of voltage second loop neutral conductor network |
| CN103323745A (en) * | 2013-06-21 | 2013-09-25 | 深圳供电局有限公司 | Method and device for monitoring and positioning hidden defects of TV secondary neutral line for relay protection |
| 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 |
| CN103592564A (en) * | 2013-11-26 | 2014-02-19 | 国家电网公司 | Grounding judgment device of voltage transformer grounded neutral wire for protecting transformer substation |
| CN103592564B (en) * | 2013-11-26 | 2016-03-30 | 国家电网公司 | The transforming plant protecting ground connection judgment means of voltage transformer (VT) grounded neutral wire |
| 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 |
| CN104360215A (en) * | 2014-11-12 | 2015-02-18 | 江苏省电力公司淮安供电公司 | Detection device for multi-point earthing fault of small bus N600 |
| CN104360215B (en) * | 2014-11-12 | 2017-10-03 | 江苏省电力公司淮安供电公司 | N600 multipoint earth faults detection means |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120502 Termination date: 20120822 |