CN201698962U - Product for preventing misoperation of relay caused by single-point grounding of DC circuit - Google Patents
Product for preventing misoperation of relay caused by single-point grounding of DC circuit Download PDFInfo
- Publication number
- CN201698962U CN201698962U CN2010202452000U CN201020245200U CN201698962U CN 201698962 U CN201698962 U CN 201698962U CN 2010202452000 U CN2010202452000 U CN 2010202452000U CN 201020245200 U CN201020245200 U CN 201020245200U CN 201698962 U CN201698962 U CN 201698962U
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- relay
- product
- semistor
- point grounding
- voltage circuit
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Abstract
The utility model discloses a product for preventing misoperation of relay caused by single-point grounding of DC circuit, belonging to the technical field of relay protection in a power industry and aiming at preventing the mal-operation of the relay, even when ground fault occurs in any end line of a trigger voltage circuit of the relay. The product comprises a relay shell, relay contacts arranged in the relay shell, the trigger voltage circuit of the relay; and a positive temperature coefficient thermistor (3) is parallelly connected with the trigger voltage circuit (2) of the relay in parallel. The product can effectively prevent mal-operation of the relay due to any end line of the trigger voltage circuit of the relay grounds, and completely eliminates accidents caused by the false cutoff of a generator and transmission lines, thus improving the safety and reliability of a power grid. The product is an ideal for improving the accuracy and reliability of the operation of the relay.
Description
Technical field: the utility model relates to a kind of product that prevents false action of direct current single-point grounding of relay, belongs to the power industry technical field of relay protection.
Background technology: well-known, relay is the important devices of protection power equipment safety operation, when electric power system is broken down, produces trip signal by relay, excises fault fast.
In order to guarantee relay energy reliably working, adopt DC power supply at present usually.Stipulate according to rules, the starting resistor of relay is the 50%-70% of rated voltage, but because the direct current cables of power plant, transformer station and loop are not only much but also longer, distributed capacitance is very big, and the actual motion voltage of dc bus often will be higher than rated voltage about 5%; During therefore normal operation, under the effect of balance resistance, if the negative pole insulation resistance is greater than anodal insulation resistance, the charging voltage of negative loop Equivalent Distributed electric capacity or protection outlet loop Equivalent Distributed electric capacity is 50% much bigger than rated voltage then.At this moment, if any end line generation one point earth in relay starting resistor loop, then may cause the relay contact misoperation and excise generator or transmission line, thereby cause power system accident; Simultaneously, because the directly exported tripping operation of relay and do not send any signal, thereby bring difficulty for the analysis accident.For this reason, current solution to the problems described above mainly contains two kinds: a kind of is the distributed capacitance that reduces power cable or loop with fiber optic cables or isolated from power; Another kind is starting resistor or the starting power that improves relay.The problem that these two kinds of methods exist is: the former invests huge, the also inconvenience of constructing, and realizes comparatively difficulty; The latter is because relay relies on the action of electromagnetic and mechanical power, and operating characteristics has bigger dispersiveness, and still misoperation can take place when the electric capacity charging voltage is higher, can not tackle the problem at its root.
Summary of the invention: at the above-mentioned defective that exists in the prior art, the utility model aims to provide a kind of product that prevents false action of direct current single-point grounding of relay, prevent during its can be in relay starting resistor loop any end generation earth fault that relay misoperation from doing, thereby avoid wrong excision energy loss and power grid security accident that generator, transmission line caused.
To achieve these goals, the utility model by the following technical solutions: it comprises the relay housing, is located at relay contact, relay starting resistor loop in this relay housing; Semistor is in parallel with relay starting resistor loop.
Semistor can be with after fixed value resistance be connected, and is in parallel with relay starting resistor loop again; Semistor both can be located in the relay housing, also can be located at outside the relay housing; If semistor is located at outside the relay housing, then coat by insulating case.Semistor and fixed value resistance both can be located in the relay housing, also can be located at outside the relay housing; If semistor and fixed value resistance are located at outside the relay housing, then both are coated by insulating case.Above-mentioned semistor can be the phase step type semistor.
Compared with the prior art, the utility model is owing to adopted technique scheme, therefore can effectively avoid any end line ground connection in relay starting resistor loop and cause relay misoperation to be done, thoroughly eliminate the accident potential that wrong excision generator, transmission line are caused, improved the safe and stable operation level and the economic benefit of electrical network.
Description of drawings:
Fig. 1 is the structural representation of the utility model embodiment 1;
Fig. 2 is the structural representation of the utility model embodiment 2;
Fig. 3 is the structural representation of the utility model embodiment 3;
Fig. 4 is the structural representation of the utility model embodiment 4.
Among the figure: 2 semistors, 3 relay housings, 4 fixed value resistances, 5 insulating cases, 6 insulated conductors 7 of relay contact 1 relay starting resistor loop
Embodiment: the utility model is described in further detail below in conjunction with accompanying drawing and specific embodiment:
Embodiment 1, and as shown in Figure 1: be provided with relay contact 1 and relay starting resistor loop 2 in the relay housing 4, the semistor 3 that is located in the relay housing 4 is in parallel with relay starting resistor loop 2.
Embodiment 4, and on the basis of embodiment 3, the utility model can also adopt structure as shown in Figure 4: semistor 3 and fixed value resistance 5 are located at outside the relay housing 4, by insulating case 6 both are coated; Semistor 3 is with after fixed value resistance 5 is connected, and is in parallel with starting resistor loop 2 by insulated conductor 7 again.
In the above-described embodiments, semistor 3 is preferably selected the phase step type semistor for use.Obviously, semistor 3 can be single semistor, also can be to be formed by a plurality of semistors or series connection or in parallel or series-parallel connection.
Claims (5)
1. prevent the product of false action of direct current single-point grounding of relay, comprise the relay housing, be located at relay contact, relay starting resistor loop in this relay housing; It is characterized in that: semistor (3) is in parallel with relay starting resistor loop (2).
2. the product that prevents false action of direct current single-point grounding of relay according to claim 1 is characterized in that: semistor (3) can be with after connect fixed value resistance (5), in parallel with relay starting resistor loop (2) again.
3. the product that prevents false action of direct current single-point grounding of relay according to claim 1 is characterized in that: semistor (3) can be located at outside the relay housing (4) and by insulating case (6) and coat.
4. the product that prevents false action of direct current single-point grounding of relay according to claim 2 is characterized in that: semistor (3) and fixed value resistance (5) can be located at outside the relay housing (4) and by insulating case (6) and coat.
5. according to any described product that prevents false action of direct current single-point grounding of relay in the claim 1～4, it is characterized in that: semistor (3) can be the phase step type semistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202452000U CN201698962U (en) | 2010-07-02 | 2010-07-02 | Product for preventing misoperation of relay caused by single-point grounding of DC circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202452000U CN201698962U (en) | 2010-07-02 | 2010-07-02 | Product for preventing misoperation of relay caused by single-point grounding of DC circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201698962U true CN201698962U (en) | 2011-01-05 |
Family
ID=43400208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202452000U Expired - Fee Related CN201698962U (en) | 2010-07-02 | 2010-07-02 | Product for preventing misoperation of relay caused by single-point grounding of DC circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201698962U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895100A (en) * | 2010-07-02 | 2010-11-24 | 贵阳新光电气有限公司 | Method for preventing false action of direct current single-point grounding of relay and product thereof |
-
2010
- 2010-07-02 CN CN2010202452000U patent/CN201698962U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895100A (en) * | 2010-07-02 | 2010-11-24 | 贵阳新光电气有限公司 | Method for preventing false action of direct current single-point grounding of relay and product thereof |
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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: 20110105 Termination date: 20170702 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |