CN205595769U - Special high voltage direct current valves the bypass switch protection circuit - Google Patents
Special high voltage direct current valves the bypass switch protection circuit Download PDFInfo
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- CN205595769U CN205595769U CN201620007522.9U CN201620007522U CN205595769U CN 205595769 U CN205595769 U CN 205595769U CN 201620007522 U CN201620007522 U CN 201620007522U CN 205595769 U CN205595769 U CN 205595769U
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- relay
- controller
- low pressure
- bypass switch
- gas density
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Abstract
The utility model discloses a special high voltage direct current valves the bypass switch protection circuit relates to the power supply or the protection device technical field of distribution. Including SF6 gas density relay, relay N1 N2 and the bypass switch tripping relay K1, does SF6 gas density relay include gas density sensor, processing circuit, controller, input module, display module, relay S1 S2. The positive pole of power is the negative pole of power connection behind first disconnection relay N1's normally open contact, second disconnection relay N2's normally open contact and the bypass switch tripping relay K1's coil in proper order, and the bypass switch tripping relay K1's normally open contact is located the bypass switch's control circuit. The protection circuit has guaranteed when circuit breaker SF6 air leakage speed is too fast, prevents that switch shutting operation from avoiding too big because of voltage, and isolation operation is in time carried out in the switch explosion, avoids enlarging the power failure scope.
Description
Technical field
This utility model relates to power supply or the protection device technical field of distribution, particularly relates to a kind of extra-high voltage direct-current valve group by-pass switch protection circuit.
Background technology
Currently, extra-high voltage direct-current all uses bivalve group series system, each valve group all to use valve group by-pass switch, when bivalve group is run, forms path, do not affect the properly functioning of another valve group when single valve group breaks down.At present, it is 8.0bar when this by-pass switch SF6 is normal, if revealing, then 7.2bar alarm, 7.0bar i.e. locking, it is impossible to carry out breaking-closing operating.Now, if causing SF6 pressure the lowest because SF6 reveals too fast, insulating properties reduces excessively quick, and owing to voltage-to-ground can reach 800kV, therefore, current latch designs is a kind of hidden danger greatly, easily causes switch blast.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of extra-high voltage direct-current valve group by-pass switch protection circuit; described protection circuit ensure that when chopper SF6 gas leakage excessive velocities; prevent circuit breaker lock operation from avoiding because voltage is excessive; switch blast; carry out isolated operation in time, it is to avoid expand power failure range.
nullFor solving above-mentioned technical problem，Technical solution adopted in the utility model is: a kind of extra-high voltage direct-current valve group by-pass switch protection circuit，It is characterized in that: include SF6 gas density relay、First disconnects relay N1、Second disconnects relay N2 and by-pass switch tripping relay K1，Described SF6 gas density relay includes Gas Density Sensor、Signal processing circuit、Controller、Input module、Display module、First low pressure relay S1 and the second low pressure relay S2，Described Gas Density Sensor is connected with the signal input part of controller by signal processing circuit，Input module is connected with the input of controller，Display module is connected with the outfan of controller，The outfan first via of controller is through the coil ground connection of the first low pressure relay S1，The coil ground connection of second tunnel the second low pressure relay S2 of controller output end，3rd tunnel of controller output end is successively through the normally opened contact of the first low pressure relay S1、The first coil ground connection disconnecting relay N1，4th tunnel of controller output end is successively through the normally opened contact of the second low pressure relay S2、The second coil ground connection disconnecting relay N2，The positive pole of power supply is successively through the first normally opened contact disconnecting relay N1、The coil of the second normally opened contact disconnecting relay N2 and by-pass switch tripping relay K1 is followed by the negative pole of power supply，The normally opened contact of by-pass switch tripping relay K1 is positioned on the control loop of by-pass switch.
nullUse and have the beneficial effects that produced by technique scheme: during disconnecting relay N1 timing closing first，If SF6 gas leakage speed is the fastest in killer switch，When SF6 gas pressure drops to 7.2bar，Controller corresponding pin output high level，The coil of the first low pressure relay S1 obtains electric，Its normally opened contact closes，Then the first coil disconnecting relay N1 obtains electric，The normally opened contact Guan Bi of N1，After the normally opened contact of the first low pressure relay S1 closes in 15min，SF6 gas pressure drops to 7.0bar from 7.2bar，Controller corresponding pin output high level，The coil of the second low pressure relay S2 obtains electric，Its normally opened contact closes，Then the second coil disconnecting relay N2 obtains electric，The normally opened contact Guan Bi of N2，Now the contact of N1 and the contact of N2 are closed at，By-pass switch tripping relay K1 must conduct，After conducting，Extra-high voltage pole will be carried out the operation of pole locking；If SF6 reveals speed relatively slowly, i.e. pressure is not less than dropping to 7.0bar during 7.2bar and in 15min, then controller disconnects by controlling first low pressure relay S1 control the first disconnection relay N1, operations staff carry out corresponding operating according to on-site actual situations.Described protection circuit ensure that when chopper SF6 gas leakage excessive velocities, prevents circuit breaker lock operation from avoiding because voltage is excessive, and switch blast carries out isolated operation, it is to avoid expand power failure range in time.
Accompanying drawing explanation
With detailed description of the invention, this utility model is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 is theory diagram of the present utility model；
Fig. 2 is the simplification figure of this utility model theory diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present utility model rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of this utility model protection.
Elaborate a lot of detail in the following description so that fully understanding this utility model, but this utility model can also use other to be different from alternate manner described here to be implemented, those skilled in the art can do similar popularization in the case of this utility model intension, and therefore this utility model is not limited by following public specific embodiment.
As shown in Figure 1-2; the utility model discloses a kind of extra-high voltage direct-current valve group by-pass switch protection circuit; including SF6 gas density relay, the first disconnection relay N1, the second disconnection relay N2 and by-pass switch tripping relay K1, described SF6 gas density relay includes Gas Density Sensor, signal processing circuit, controller, input module, display module, the first low pressure relay S1 and the second low pressure relay S2.
nullDescribed Gas Density Sensor is connected with the signal input part of controller by signal processing circuit，Input module is connected with the input of controller，Display module is connected with the outfan of controller，The outfan first via of controller is through the coil ground connection of the first low pressure relay S1，The coil ground connection of second tunnel the second low pressure relay S2 of controller output end，3rd tunnel of controller output end is successively through the normally opened contact of the first low pressure relay S1、The first coil ground connection disconnecting relay N1，4th tunnel of controller output end is successively through the normally opened contact of the second low pressure relay S2、The second coil ground connection disconnecting relay N2，The positive pole of power supply is successively through the first normally opened contact disconnecting relay N1、The coil of the second normally opened contact disconnecting relay N2 and by-pass switch tripping relay K1 is followed by the negative pole of power supply，The normally opened contact of by-pass switch tripping relay K1 is positioned on the control loop of by-pass switch.
nullDuring disconnecting relay N1 timing closing first，If SF6 gas leakage speed is the fastest in killer switch，When SF6 gas pressure drops to 7.2bar，Controller corresponding pin output high level，The coil of the first low pressure relay S1 obtains electric，Its normally opened contact closes，Then the first coil disconnecting relay N1 obtains electric，The normally opened contact Guan Bi of N1，After the normally opened contact of the first low pressure relay S1 closes in 15min，SF6 gas pressure drops to 7.0bar from 7.2bar，Controller corresponding pin output high level，The coil of the second low pressure relay S2 obtains electric，Its normally opened contact closes，Then the second coil disconnecting relay N2 obtains electric，The normally opened contact Guan Bi of N2，Now the contact of N1 and the contact of N2 are closed at，By-pass switch tripping relay K1 must conduct，After conducting，Extra-high voltage pole will be carried out the operation of pole locking；If SF6 reveals speed relatively slowly, i.e. pressure is not less than dropping to 7.0bar during 7.2bar and in 15min, then controller disconnects by controlling first low pressure relay S1 control the first disconnection relay N1, operations staff carry out corresponding operating according to on-site actual situations.Described protection circuit ensure that when chopper SF6 gas leakage excessive velocities, prevents circuit breaker lock operation from avoiding because voltage is excessive, and switch blast carries out isolated operation, it is to avoid expand power failure range in time.
Claims (1)
- null1. an extra-high voltage direct-current valve group by-pass switch protection circuit，It is characterized in that: include SF6 gas density relay、First disconnects relay N1、Second disconnects relay N2 and by-pass switch tripping relay K1，Described SF6 gas density relay includes Gas Density Sensor、Signal processing circuit、Controller、Input module、Display module、First low pressure relay S1 and the second low pressure relay S2，Described Gas Density Sensor is connected with the signal input part of controller by signal processing circuit，Input module is connected with the input of controller，Display module is connected with the outfan of controller，The outfan first via of controller is through the coil ground connection of the first low pressure relay S1，The coil ground connection of second tunnel the second low pressure relay S2 of controller output end，3rd tunnel of controller output end is successively through the normally opened contact of the first low pressure relay S1、The first coil ground connection disconnecting relay N1，4th tunnel of controller output end is successively through the normally opened contact of the second low pressure relay S2、The second coil ground connection disconnecting relay N2，The positive pole of power supply is successively through the first normally opened contact disconnecting relay N1、The coil of the second normally opened contact disconnecting relay N2 and by-pass switch tripping relay K1 is followed by the negative pole of power supply，The normally opened contact of by-pass switch tripping relay K1 is positioned on the control loop of by-pass switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620007522.9U CN205595769U (en) | 2016-01-07 | 2016-01-07 | Special high voltage direct current valves the bypass switch protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620007522.9U CN205595769U (en) | 2016-01-07 | 2016-01-07 | Special high voltage direct current valves the bypass switch protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205595769U true CN205595769U (en) | 2016-09-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620007522.9U Expired - Fee Related CN205595769U (en) | 2016-01-07 | 2016-01-07 | Special high voltage direct current valves the bypass switch protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205595769U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106486977A (en) * | 2016-11-14 | 2017-03-08 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of extra-high voltage direct-current by-pass switch guard method with integration self-cleaning function |
-
2016
- 2016-01-07 CN CN201620007522.9U patent/CN205595769U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106486977A (en) * | 2016-11-14 | 2017-03-08 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of extra-high voltage direct-current by-pass switch guard method with integration self-cleaning function |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160921 Termination date: 20170107 |