CN203434624U - 20kV flexible grounding control device - Google Patents
20kV flexible grounding control device Download PDFInfo
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- CN203434624U CN203434624U CN201320416915.1U CN201320416915U CN203434624U CN 203434624 U CN203434624 U CN 203434624U CN 201320416915 U CN201320416915 U CN 201320416915U CN 203434624 U CN203434624 U CN 203434624U
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- 230000001629 suppression Effects 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims abstract description 5
- 238000013016 damping Methods 0.000 claims abstract description 4
- 230000007935 neutral effect Effects 0.000 claims description 22
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 description 11
- 230000009471 action Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000001052 transient effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Abstract
A 20kV flexible grounding control device mainly comprises a main transformer of a substation. The main transformer of the substation is respectively connected with two grounding lines through a disconnecting link. One of the lines is connected with the ground after an arc suppression coil and a damping resistor are connected in series, and the other line is connected with the ground through a small resistor. The 20kV flexible grounding control device is characterized in that a small resistor grounding loop is connected in series with a switch controlled by a smart controller, the smart controller is mainly composed of an AC board responsible for collecting field measurement value signals, an IO board responsible for collecting field on-off state signals, and a DPU board connected with the AC board and the IO board and used for receiving the field measurement value signals and the field on-off state signals and for controlling output, and the control output on the DPU board is connected with a DO board responsible for relay output control. The 20kV flexible grounding control device achieves flexible control over a small resistor device of a 20kV system and is suitable for occasions in which an arc suppression coil and a small resistor are in parallel operation.
Description
Technical field
the utility model relates to a kind of 20kV neutral flexible grounding control device and control method, belong to the neutral ground technical field of electric power system.
Background technology
At present, grounding through arc mode has obtained widespread adoption at home, and the advantage by grounding through arc mode is to extinguish rapidly earth point fault current, restriction arc light grounding surge and ferro-resonance over-voltage, instant earthing, without tripping operation, reduces frequency of power cut.But along with increasing of city cable outlet, system capacitive current increases, cause arc suppression coil capacity increasing, manufacture difficulty and cost are more and more higher, consider the restriction of large capacity coil coil, and some areas start to adopt the operational mode of Neutral Point Through Low Resistance.
In distribution network systems; adopt after low resistance grounding; when there is earth fault; route protection directly trips; cause arc suppression coil cannot play due effect, once and small resistance grounding system there is earth fault, will excise faulty line; cause circuit Frequent trip, system operation reliability is not high.
Therefore, study a kind of small resistor neutral flexible grounding control device, allow arc suppression coil and small resistor jointly use, ensure the stable operation of electrical network, will improve greatly power supply reliability and the equipment reliability of operation of system.
Utility model content
The purpose of this utility model is to overcome the deficiency that prior art exists, and a kind of flexible control of small resistor device of the 20kV of realization system is provided, and is applicable to 20kV neutral flexible grounding control device and the control method of arc suppression coil and small resistor paired running occasion.
The purpose of this utility model completes by following technical solution, a kind of 20kV neutral flexible grounding control device, it is by by ground connection after arc suppression coil and damping resistance series connection that the main transformer that it mainly comprises a transformer station connects respectively following two-way ground path ，Yi road by a disconnecting link; Another road is by a low resistance grounding, it is characterized in that being in series with an intelligent switch of being controlled by controller in described low resistance grounding loop, described controller mainly by one be responsible for collection site measuring amount signal AC plate, an IO plate, of being responsible for collection site switch state signal be connected respectively with AC plate, IO plate and receive respectively in-site measurement amount signal and on-the-spot switch state signal, and the DPU plate of controlling output form, the control output on described DPU plate connects a DO plate of being responsible for relay output control.
Described DPU plate disposes the operation panel and of a coupling road device and is responsible for the PWR plate that device is powered.
A kind of utilization is the control method of 20kV neutral flexible grounding control device as mentioned above, the method is: if the earth fault occurring is transient fault, fault will disappear very soon, system reverts to normal operating condition very soon, the power failure of can not tripping of whole process, intelligent controller can not controlled small resistor and drop into action;
If the earth fault occurring does not disappear for a long time, can think permanent earth fault has occurred, now, and the time delay td2 time, drop into small resistor, coordinate relay equipment excision faulty line;
In whole operating process, intelligent controller is monitored the running status of neutral point in real time, normal if neutral point voltage recovers, illustrate that action is normal, faulty line trips, and intelligent controller excises small resistor automatically by switch, and system returns to normal operating condition; If neutral point voltage is still very high, think that system tripping operation is abnormal, faulty line does not trip, intelligent controller excision small resistor, output abnormality alarm simultaneously.
The utility model can be realized the flexible control in the low resistance grounding loop of 20kV system, thereby reach the target that arc suppression coil and small resistor paired running are controlled, and performance advantage separately: instantaneity ground connection is by arc suppression coil auto-compensation, only have when there is permanent earth, just drop in short-term small resistor, automatically excise faulty line; Like this, instantaneity ground connection, without excision faulty line, can not caused frequent power failure, does not affect power supply reliability; For permanent fault, drop in short-term small resistor, coordinate relay equipment excision faulty line, shorten electric network fault running time, thus the safe operation of support equipment, circuit.
Accompanying drawing explanation
Fig. 1 is grounding control device structural representation described in the utility model.
Fig. 2 is the composition schematic diagram of controller described in the utility model.
Fig. 3 is controller control logic figure described in the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail: shown in Fig. 1,20kV neutral flexible grounding control device described in the utility model, it is by by ground connection after arc suppression coil 3 and damping resistance 4 series connection that the main transformer 1 that it mainly comprises a transformer station connects respectively following two-way ground path ，Yi road by a disconnecting link 2; Another road is by small resistor 5 ground connection, in described small resistor 5 grounded circuits, is in series with a switch of being controlled by intelligent controller 67.
Shown in Fig. 2, described intelligent controller 6 mainly by one be responsible for collection site measuring amount signal AC plate, an IO plate, of being responsible for collection site switch state signal be connected respectively with AC plate, IO plate and receive respectively in-site measurement amount signal and on-the-spot switch state signal, and the DPU plate of controlling output form, the control output on described DPU plate connects a DO plate of being responsible for relay output control.
Described DPU plate disposes the operation panel and of a coupling road device and is responsible for the PWR plate that device is powered.
Shown in Fig. 3, a kind of utilization is the control method of 20kV neutral flexible grounding control device as mentioned above, the method is: if the earth fault occurring is transient fault, fault will disappear very soon, system reverts to normal operating condition very soon, the power failure of can not tripping of whole process, intelligent controller can not controlled small resistor and drop into action;
If the earth fault occurring does not disappear for a long time, can think permanent earth fault has occurred, now, and the time delay td2 time, drop into small resistor, coordinate relay equipment excision faulty line;
In whole operating process, intelligent controller is monitored the running status of neutral point in real time, normal if neutral point voltage recovers, illustrate that action is normal, faulty line trips, and intelligent controller excises small resistor automatically by switch, and system returns to normal operating condition; If neutral point voltage is still very high, think that system tripping operation is abnormal, faulty line does not trip, intelligent controller excision small resistor, output abnormality alarm simultaneously.
Neutral flexible grounding control device possesses a series of functions such as event report, Trouble Report, record ripple simultaneously, is convenient to user the whole service process of equipment is monitored.
Embodiment
Intelligent controller described in the utility model, mainly contain: AC plate is responsible for the measuring amount signal of collection site, IO plate is responsible for the switch state signal of collection site, DO plate is responsible for the output of relay and is controlled, PWR plate is responsible for the power supply of device, trip plate is the operation panel of coupling road device, and DPU plate is responsible for integrating the signal of all boards and is controlled output.
The utility model, according to the control logic shown in Fig. 3, is controlled small resistor equipment flexibly: when system is normally moved, the small resistor that is connected on neutral point of main transformer does not put into operation, and arc suppression coil puts into operation.When system generation single phase ground fault, neutral flexible grounding controller, according to the difference of actual conditions, judges the operation of small resistor flexibly.
When system is unearthed, vacuum contactor is in off-state, and small resistor does not drop into; After system earth occurs, closed vacuum contactor at once not.By monitoring neutral point voltage, judgement ground state, whether ground connection Lock-out; If ground connection disappears, think transient earthing fault, vacuum contactor is failure to actuate, and remains open state; When the system earth duration, (for example: 3s) surpass setting time, be judged to be continuous earth fault occurs, closed vacuum contactor now, drop into small resistor with restriction arc light grounding surge, produce enough large current in resistance property simultaneously, trigger the action of faulty line zero-sequence current protection, excision faulty line; When continuing to drop into small resistor, (for example: 2s) after second, vacuum contactor is disconnected, excise small resistor device in parallel arrive setting time.Consider feeder line reclosing, general resistance making time is less than 10 seconds.
Claims (2)
1. a 20kV neutral flexible grounding control device, it is by by ground connection after arc suppression coil and damping resistance series connection that the main transformer that it mainly comprises a transformer station connects respectively following two-way ground path ，Yi road by a disconnecting link; Another road is by a low resistance grounding, it is characterized in that being in series with a switch of being controlled by intelligent controller in described low resistance grounding loop, described intelligent controller mainly by one be responsible for collection site measuring amount signal AC plate, an IO plate, of being responsible for collection site switch state signal be connected respectively with AC plate, IO plate and receive respectively in-site measurement amount signal and on-the-spot switch state signal, and the DPU plate of controlling output form, the control output on described DPU plate connects a DO plate of being responsible for relay output control.
2. 20kV neutral flexible grounding control device according to claim 1, is characterized in that described DPU plate disposes the operation panel of a coupling road device and the PWR plate of a responsible device power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320416915.1U CN203434624U (en) | 2013-07-15 | 2013-07-15 | 20kV flexible grounding control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320416915.1U CN203434624U (en) | 2013-07-15 | 2013-07-15 | 20kV flexible grounding control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203434624U true CN203434624U (en) | 2014-02-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320416915.1U Expired - Fee Related CN203434624U (en) | 2013-07-15 | 2013-07-15 | 20kV flexible grounding control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203434624U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441485A (en) * | 2013-07-15 | 2013-12-11 | 嘉兴电力局 | 20kV flexible grounding control device and 20kV flexible grounding control method |
| CN110148931A (en) * | 2019-06-05 | 2019-08-20 | 南方电网科学研究院有限责任公司 | Arc suppression coil parallel low-resistance grounding device and control method |
-
2013
- 2013-07-15 CN CN201320416915.1U patent/CN203434624U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441485A (en) * | 2013-07-15 | 2013-12-11 | 嘉兴电力局 | 20kV flexible grounding control device and 20kV flexible grounding control method |
| CN110148931A (en) * | 2019-06-05 | 2019-08-20 | 南方电网科学研究院有限责任公司 | Arc suppression coil parallel low-resistance grounding device and control method |
| CN110148931B (en) * | 2019-06-05 | 2021-01-08 | 南方电网科学研究院有限责任公司 | Arc suppression coil parallel low-resistance grounding device and control method |
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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: 20140212 Termination date: 20200715 |
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| CF01 | Termination of patent right due to non-payment of annual fee |