CN202586265U - Power system protection device - Google Patents
Power system protection device Download PDFInfo
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- CN202586265U CN202586265U CN 201220226241 CN201220226241U CN202586265U CN 202586265 U CN202586265 U CN 202586265U CN 201220226241 CN201220226241 CN 201220226241 CN 201220226241 U CN201220226241 U CN 201220226241U CN 202586265 U CN202586265 U CN 202586265U
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- coefficient thermistor
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Abstract
The utility model relates to a power system protection device. The power system protection device comprises a time-delay circuit breaker protection circuit, a negative temperature coefficient thermistor, a control switch and a fast circuit breaker protection circuit, wherein the time-delay circuit breaker protection circuit carries out circuit breaker protection for a circuit when a short circuit fault of a system occurs, and does not make false operation on instantaneous surge current when the system starts normally, the negative temperature coefficient thermistor restrains surge current caused by capacitive load charging at the instant of start-up, the control switch instantly opens when the system starts, closes after the system finishes start, ameliorates the surge current and eliminates influence of the negative temperature coefficient thermistor on conversion efficiency, and the fast circuit breaker protection circuit opens in time to make a peak value of short circuit current be restrained by the negative temperature coefficient thermistor when the short circuit fault of the system occurs. According to the power system protection device, when the short circuit fault of the system occurs, the fast circuit breaker protection circuit can opens in time to avoid shock damage to other parts caused by the surge current, so protection characteristics of the power system is totally improved, and disadvantages of power protection devices in the prior art are settled.
Description
Technical field
The utility model relates to power domain, relates in particular to a kind of electric system protection device.
Background technology
In the modern power systems; A large amount of capacitive loads is generally all arranged; Because the initial voltage of electric capacity is zero, so using electricity system can cause huge surge current to capacitor fast charging in start-up course, all can produce huge harm to electric power system and using electricity system itself; Even surge current can cause part of devices to burn, and causes product failure.For suppressing the surge current that the charging of start moment capacitive load brings; General traditional straightforward procedure is string one negative tempperature coefficient thermistor NTC (Negative Temperature Coefficient) in incoming line; Like figure one, system start-up moment, the effective limit inrush currents of meeting was in the safe range of setting because the NTC resistance is bigger; And during steady operation; Electric current flows through loss meeting that NTC produces and converts heat into its temperature is raise, and resistance reduces, so the loss meeting that brings of NTC remains on the level of acceptance relatively.Requiring in the higher product design of the lower conversion efficiency of surge current, it is bigger that the NTC resistance under the normal temperature can be selected, for avoiding the influence of NTC to product conversion efficiency under the nominal situation; At the NTC two ends again and a switching device (can be relay or other semiconductor device); Like figure two, promptly break off at system start-up snap switch device, surge current obtains restriction through NTC; After starting completion; Switching device is connected, and operating current directly through the switching device bypass, had both improved surge and also eliminated the influence of NTC to conversion efficiency.Above method is all widely applied in actual production.In fact; The effect of NTC limit inrush currents is limited; When particularly system worked under higher temperature, so the broken circuit protecting equipment that system input is generally selected for use is time lagged type (slowly disconnected type), the surge current when avoiding normally starting made the broken circuit protecting equipment misoperation.But because the minimum and very difficult timely disconnection of switching device equiva lent impedance (as relay maximum opening time reach 10ms even higher); So short-circuit current is not owing to there is the NTC current limliting generally huge; Action is untimely when causing time lagged type (slowly disconnected type) broken circuit protecting equipment to tend to short trouble to occur in system; Cause electric power system single-stage or multi-staged air switch trip, directly have influence on people's life and production.Particularly,, bring enormous economic loss for enterprise and terminal use because the machine room that the power module fault causes outage is not rarely seen in fields such as communications equipment room or cloud computings.
The utility model content
The main purpose of the utility model is to provide a kind of electric system protection device; Be intended to solve present electric system protection device because the minimum and very difficult timely disconnection of switching device equiva lent impedance; Short-circuit current is not owing to there is the NTC current limliting generally huge; Action is untimely when causing the time lagged type broken circuit protecting equipment to tend to short trouble to occur in system, causes the problem of electric power system single-stage or multi-staged air switch trip.
The utility model is achieved in that a kind of electric system protection device, and input is connected with electric power system, and output is connected with capacitive load, comprising:
Input is connected with electric power system, when system's failed because, circuit is carried out open circuit protection and the instantaneous surge current when system normally not being started produces the time lagged type breaking protection circuit of misoperation;
First end is connected with the output of said time lagged type breaking protection circuit, and second end is connected with said capacitive load, the negative tempperature coefficient thermistor of the surge current that the charging of inhibition start moment capacitive load brings;
Input is connected with the output of said time lagged type breaking protection circuit and first end of negative tempperature coefficient thermistor respectively; Control end is connected with control signal, breaks off in system start-up moment, after system start-up is accomplished, connects, improves surge current and eliminates the control switch of said negative tempperature coefficient thermistor to the conversion efficiency influence;
Input is connected with the output of said control switch; Output is connected with second end of said capacitive load and said negative tempperature coefficient thermistor respectively, the quick type breaking protection circuit that action disconnection in time makes the peak value of short-circuit current be effectively suppressed through said negative tempperature coefficient thermistor when short trouble appears in system.
In the said structure, said time lagged type breaking protection circuit is a fuse, and the input of said fuse is connected with electric power system, and the output of said fuse is connected with first end of said negative tempperature coefficient thermistor and the input of said control switch respectively.
In the said structure; Said control switch is a relay; The input of said relay is connected with the output of said time lagged type breaking protection circuit and first end of said negative tempperature coefficient thermistor respectively; The output of said relay is connected with the input of said quick type breaking protection circuit, and the control end of said relay is connected with said control signal.
In the said structure, said quick type breaking protection circuit is express fusing type fuse, and the input of said express fusing type fuse is connected with the output of said control switch, and output is connected with capacitive load.
In the utility model; When the switching device failed because; Fast the type broken circuit protecting equipment also can in time break off to avoid surge current to the damage that impacts of other part of devices, has promoted the protective feature of using electricity system comprehensively, has overcome the deficiency of existing electric protection device.
Description of drawings
Fig. 1 is the structural representation of traditional electric system protection device;
Fig. 2 is the structural representation of present modified model electric system protection device;
Fig. 3 is the structural representation of the electric system protection device that provides of the utility model embodiment.
Embodiment
For the purpose, principle and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The main purpose of the utility model is to provide a kind of electric system protection device; Utilize quick type breaking protection circuit, can realize that action disconnection in time makes the peak value of short-circuit current be effectively suppressed through said negative tempperature coefficient thermistor when short trouble appears in system.
Fig. 3 shows the structure of a kind of electric system protection device that the utility model embodiment provides, and for the ease of explanation, only shows the part relevant with the utility model, and details are as follows.
The utility model is achieved in that a kind of electric system protection device, and input is connected with electric power system, and output is connected with capacitive load, comprising:
Input is connected with electric power system, when system's failed because, circuit is carried out open circuit protection and the instantaneous surge current when system normally not being started produces the time lagged type breaking protection circuit 100 of misoperation;
First end is connected with the output of said time lagged type breaking protection circuit 100, and second end is connected with said capacitive load, the negative tempperature coefficient thermistor 200 of the surge current that the charging of inhibition start moment capacitive load brings;
Input is connected with the output of said time lagged type breaking protection circuit 100 and first end of negative tempperature coefficient thermistor 200 respectively; Control end is connected with control signal, breaks off in system start-up moment, after system start-up is accomplished, connects, improves surge current and eliminates the control switch 300 of 200 pairs of conversion efficiencies influences of said negative tempperature coefficient thermistor;
Input is connected with the output of said control switch 300; Output is connected with second end of said capacitive load and said negative tempperature coefficient thermistor 200 respectively, the quick type breaking protection circuit 400 that action disconnection in time makes the peak value of short-circuit current be effectively suppressed through said negative tempperature coefficient thermistor 200 when short trouble appears in system.
As the utility model one embodiment; Said time lagged type breaking protection circuit 100 is a fuse; The input of said fuse is connected with electric power system, and the output of said fuse is connected with first end of said negative tempperature coefficient thermistor 200 and the input of said control switch 300 respectively.
In the utility model embodiment, fuse is the time lagged type element that opens circuit, and the surge current in the time of avoiding normally starting makes the broken circuit protecting equipment misoperation.
As the utility model one embodiment; Said control switch 300 is a relay; The input of said relay is connected with the output of said time lagged type breaking protection circuit 100 and first end of said negative tempperature coefficient thermistor 200 respectively; The output of said relay is connected with the input of said quick type breaking protection circuit 400, and the control end of said relay is connected with said control signal.
As the utility model one embodiment; Said quick type breaking protection circuit 400 is express fusing type fuse; The input of said express fusing type fuse is connected with the output of said control switch 300, and the output of said express fusing type fuse is connected with capacitive load.
The concrete operation principle of the utility model is following:
System start-up moment since control switch 300 break off; Surge current is effectively limited through NTC and can not caused the protection misoperation through quick type broken circuit protecting equipment; After starting completion, control switch 300 is connected, and operating current is directly through control switch 300 and type breaking protection circuit 400 bypasses fast; Because control switch 300 had also been eliminated the influence of NTC to conversion efficiency with type breaking protection circuit 400 equiva lent impedances are minimum fast so both limited surge current.Simultaneously, if short trouble appears in system, instantaneous short circuit current can make the action in time of quick type breaking protection circuit 400 break off; The peak value of short-circuit current can be effectively suppressed through NTC; Time lagged type (slowly disconnected type) broken circuit protecting equipment in this case can effective action, because the short-circuit current peak value is not high, causes the possibility of the multistage tripping operation of air switch of electric power system just to avoid; This method is simple and reliable; The quick type broken circuit protecting equipment that increases can be express fusing type fuse etc., and is with low cost, can be widely used on the various power consumption equipments in the productive life.
In the utility model; When the switching device failed because; Fast the type broken circuit protecting equipment also can in time break off to avoid surge current to the damage that impacts of other part of devices, has promoted the protective feature of using electricity system comprehensively, has overcome the deficiency of existing electric protection device.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (4)
1. electric system protection device, input is connected with electric power system, and output is connected with capacitive load, it is characterized in that, and said device comprises:
Input is connected with electric power system, when system's failed because, circuit is carried out open circuit protection and the instantaneous surge current when system normally not being started produces the time lagged type breaking protection circuit of misoperation;
First end is connected with the output of said time lagged type breaking protection circuit, and second end is connected with said capacitive load, the negative tempperature coefficient thermistor of the surge current that the charging of inhibition start moment capacitive load brings;
Input is connected with the output of said time lagged type breaking protection circuit and first end of negative tempperature coefficient thermistor respectively; Control end is connected with control signal, breaks off in system start-up moment, after system start-up is accomplished, connects, improves surge current and eliminates the control switch of said negative tempperature coefficient thermistor to the conversion efficiency influence;
Input is connected with the output of said control switch; Output is connected with second end of said capacitive load and said negative tempperature coefficient thermistor respectively, the quick type breaking protection circuit that action disconnection in time makes the peak value of short-circuit current be effectively suppressed through said negative tempperature coefficient thermistor when short trouble appears in system.
2. electric system protection device as claimed in claim 1; It is characterized in that; Said time lagged type breaking protection circuit is a fuse; The input of said fuse is connected with electric power system, and the output of said fuse is connected with first end of said negative tempperature coefficient thermistor and the input of said control switch respectively.
3. electric system protection device as claimed in claim 1; It is characterized in that; Said control switch is a relay; The input of said relay is connected with the output of said time lagged type breaking protection circuit and first end of said negative tempperature coefficient thermistor respectively, and the output of said relay is connected with the input of said quick type breaking protection circuit, and the control end of said relay is connected with said control signal.
4. electric system protection device as claimed in claim 1; It is characterized in that; Said quick type breaking protection circuit is express fusing type fuse; The input of said express fusing type fuse is connected with the output of said control switch, and the output of said express fusing type fuse is connected with capacitive load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220226241 CN202586265U (en) | 2012-05-18 | 2012-05-18 | Power system protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220226241 CN202586265U (en) | 2012-05-18 | 2012-05-18 | Power system protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202586265U true CN202586265U (en) | 2012-12-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220226241 Withdrawn - After Issue CN202586265U (en) | 2012-05-18 | 2012-05-18 | Power system protection device |
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| Country | Link |
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| CN (1) | CN202586265U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427392A (en) * | 2012-05-18 | 2013-12-04 | 中国长城计算机深圳股份有限公司 | Protective device for electric system |
| CN104377660A (en) * | 2013-08-13 | 2015-02-25 | 中兴通讯股份有限公司 | Mobile terminal charging temperature protection method and device |
| CN107645263A (en) * | 2016-07-20 | 2018-01-30 | 湖南中车时代电动汽车股份有限公司 | Electric machine controller |
| CN107979269A (en) * | 2017-11-08 | 2018-05-01 | 珠海格力电器股份有限公司 | Current foldback circuit |
-
2012
- 2012-05-18 CN CN 201220226241 patent/CN202586265U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427392A (en) * | 2012-05-18 | 2013-12-04 | 中国长城计算机深圳股份有限公司 | Protective device for electric system |
| CN103427392B (en) * | 2012-05-18 | 2016-03-02 | 中国长城计算机深圳股份有限公司 | A kind of electric system protection device |
| CN104377660A (en) * | 2013-08-13 | 2015-02-25 | 中兴通讯股份有限公司 | Mobile terminal charging temperature protection method and device |
| CN104377660B (en) * | 2013-08-13 | 2019-11-26 | 中兴通讯股份有限公司 | A kind of mobile terminal charging temperature guard method and device |
| CN107645263A (en) * | 2016-07-20 | 2018-01-30 | 湖南中车时代电动汽车股份有限公司 | Electric machine controller |
| CN107979269A (en) * | 2017-11-08 | 2018-05-01 | 珠海格力电器股份有限公司 | Current foldback circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121205 Effective date of abandoning: 20160302 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |