CN203826924U - Three-phase undervoltage release - Google Patents
Three-phase undervoltage release Download PDFInfo
- Publication number
- CN203826924U CN203826924U CN201420178490.XU CN201420178490U CN203826924U CN 203826924 U CN203826924 U CN 203826924U CN 201420178490 U CN201420178490 U CN 201420178490U CN 203826924 U CN203826924 U CN 203826924U
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- phase
- electrically connected
- pressure limiting
- voltage
- circuit
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Abstract
The utility model discloses a three-phase undervoltage release comprising a switch circuit, a trip coil, and a voltage-limiting circuit electrically connected with three-phase power. The voltage-limiting circuit comprises a phase-A voltage-limiting circuit, a phase-B voltage-limiting circuit, and a phase-C voltage-limiting circuit that all comprise voltage-reducing units and voltage-limiting units electrically connected with three-phase power. Each voltage-reducing unit is electrically connected with a corresponding voltage-limiting unit. The voltage-reducing units are all electrically connected with the switch circuit. The switch circuit is electrically connected with the trip coil. The three-phase undervoltage release detects whether the three-phase power is in an undervoltage state with the voltage-limiting circuit. The switch circuit is controlled by the voltage-limiting circuit and the trip coil is controlled by the switch circuit. Thus, an effect of detecting the three-phase power so as to protect the three-phase power can be achieved and a master control chip is not required to be arranged in the three-phase undervoltage release to perform control.
Description
Technical field
The utility model relates to a kind of release, relates in particular a kind of three-phase device for under-voltage releasing equipment.
Background technology
Release is joined earth leakage protective device; effect is that the vector of the electric current by zero sequence current mutual inductor in the time that circuit has electric leakage or the person to get an electric shock is not equal to zero; two sides of instrument transformer secondary coil produce voltage; and amplify through integrated circuit; in the time reaching setting value;, get an electric shock and leakage protection thereby play at 0.1 second internal cutting off power supply by leakage tripping device.
The release that had is in the market all unidirectional, the just multiple release combinations of needs in the time that needs add release protection to three-phase electricity, trouble very.
Having notification number is that the patent of CN 102856131A discloses a kind of device for under-voltage releasing equipment that is applicable to three phase mains, by rectification circuit, three-phase current is carried out to rectification, after rectification, sample circuit carries out voltage sampling to this electric current again, after sampling, be sent to main control module and contrast computing, then main control module makes release whether produce the action of threading off by control switch circuit.But above circuit structure complexity, has used multiple circuit, make trouble very, and used main control module, can increase the holistic cost of device for under-voltage releasing equipment.
Utility model content
The deficiency existing for prior art, the three-phase device for under-voltage releasing equipment that provides a kind of circuit structure simple, easy to make, with low cost is provided the purpose of this utility model.
For achieving the above object, the utility model provides following technical scheme: a kind of three-phase device for under-voltage releasing equipment, comprise switching circuit, tripping coil, pressure limiting circuit for being electrically connected with three-phase electricity, described pressure limiting circuit comprises A phase pressure limiting circuit, B phase pressure limiting circuit and C phase pressure limiting circuit, described A, B, C pressure limiting circuit include pressure unit and the compression limiter for being electrically connected with three-phase electricity, described compression limiter is electrically connected with pressure unit, described pressure unit is all electrically connected with switching circuit, and described switching circuit is electrically connected with tripping coil.
By adopting technique scheme, in the time that release is linked in three-phase electricity, three-phase electricity will apply voltage to pressure limiting circuit, pressure limiting circuit will carry out pressure limiting by the voltage that is input to device for under-voltage releasing equipment of three-phase electricity, and then through pressure unit step-down, three-phase electricity after step-down is input among switching circuit, power to switching circuit, because pressure limiting circuit comprises A phase pressure limiting circuit, B phase pressure limiting circuit and C phase pressure limiting circuit, A, B, C pressure limiting circuit includes pressure unit and the compression limiter for being electrically connected with three-phase electricity, compression limiter is electrically connected with pressure unit, pressure unit is electrically connected with switching circuit, switching circuit is electrically connected with tripping coil, when A phase or B phase or C occur under-voltage time mutually, will cause the output voltage of pressure limiting circuit to change, switching circuit will disconnect, tripping coil power-off, the action of threading off, so just can reach and when three-phase electricity one road is under-voltage, produce in time the action of threading off, the equipment that protection is electrically connected with three-phase electricity, just need to a control chip be set in internal circuit, internal circuit and the cost of manufacture that has reduced release are simplified.
The utility model is further set to: described compression limiter comprises pressure limiting resistance, and described pressure limiting resistance is in parallel with pressure unit.
By adopting technique scheme, pressure limiting resistance just can well limit the voltage that is input to pressure unit, does not need too complicated circuit structure, has further simplified internal circuit, has reduced the cost of manufacture of release.
The utility model is further set to: described pressure unit comprises several resistance, and described resistance is electrically connected with switching circuit after connecting successively.
By adopting technique scheme, connect and just can reach a good dividing potential drop effect by resistance, just can carry the voltage of coming to carry out step-down compression limiter, can better power to tripping coil.
The utility model is further set to: described switching circuit comprises A phase triode, B phase triode and C phase triode, described A phase transistor base is electrically connected with A phase pressure limiting circuit, described B phase transistor base is electrically connected with B phase pressure limiting circuit, described B phase transistor collector is electrically connected with the emitter of A phase triode, described C phase transistor base is electrically connected with C phase pressure limiting circuit, described C phase transistor collector is electrically connected with B phase transistor emitter, described A phase transistor collector is electrically connected with tripping coil, described C phase transistor emitter ground connection.
By adopting technique scheme; so just can be by independent the pressure limiting circuit of A, B, C, three-phase; when a certain appearance mutually under-voltage time wherein; corresponding triode will disconnect; make tripping coil produce the action of threading off; just can reach when three-phase electricity is wherein any one when occurring under-voltage problem mutually, tripping coil just can produce the action of threading off timely and effectively, effectively protects three-phase electricity circuit.
The utility model is further set to: described tripping coil is parallel with diode.
By adopting technique scheme, in the time of tripping coil power-off, can induce a recoil electric current, the setting of the diode electric current that just can effectively prevent from recoiling backwashes to triode, burns out triode.
Brief description of the drawings
Fig. 1 is the circuit diagram of three-phase device for under-voltage releasing equipment of the present utility model.
In figure: 1, switching circuit; 2, pressure limiting circuit; 21, A phase pressure limiting circuit; 22, B phase pressure limiting circuit; 23, C phase pressure limiting circuit; 3, compression limiter; 4, pressure unit; RX, pressure limiting resistance; R, resistance; QA, A phase triode; QB, B phase triode; QC, C phase triode; D, diode; T, tripping coil.
Embodiment
Shown in Fig. 1, a kind of three-phase device for under-voltage releasing equipment of the present embodiment, comprise switching circuit 1, tripping coil T, pressure limiting circuit 2 for being electrically connected with three-phase electricity, described pressure limiting circuit 2 comprises A phase pressure limiting circuit 21, B phase pressure limiting circuit 22 and C phase pressure limiting circuit 23, described A, B, C pressure limiting circuit 2 include pressure unit 4 and the compression limiter 3 for being electrically connected with three-phase electricity, described compression limiter 3 is electrically connected with pressure unit 4, described pressure unit 4 is electrically connected with switching circuit 1, and described switching circuit 1 is electrically connected with tripping coil T.
By adopting technique scheme, in the time that release is linked in three-phase electricity, three-phase electricity applies voltage will to pressure limiting circuit 2, pressure limiting circuit 2 will carry out pressure limiting by the voltage that is input to device for under-voltage releasing equipment of three-phase electricity, and then through pressure unit 4 step-downs, three-phase electricity after step-down is input among switching circuit 1, power to switching circuit 1, because pressure limiting circuit 2 comprises A phase pressure limiting circuit 21, B phase pressure limiting circuit 22 and C phase pressure limiting circuit 23, A, B, C pressure limiting circuit 2 includes pressure unit 4 and the compression limiter 3 for being electrically connected with three-phase electricity, compression limiter 3 is electrically connected with pressure unit 4, pressure unit 4 is electrically connected with switching circuit 1, switching circuit 1 is electrically connected with tripping coil T, when A phase or B phase or C occur under-voltage time mutually, will cause the output voltage of pressure limiting circuit 2 to change, switching circuit 1 will disconnect, tripping coil T will power-off, the action of threading off, so just can reach and when three-phase electricity one road is under-voltage, produce in time the action of threading off, the equipment that protection is electrically connected with three-phase electricity, just need to a control chip be set in internal circuit, internal circuit and the cost of manufacture that has reduced release are simplified.
Described compression limiter 3 comprises pressure limiting resistance R X, and described pressure limiting resistance R X is in parallel with pressure unit 4.
By adopting technique scheme, pressure limiting resistance R X just can well limit the voltage that is input to pressure unit 4, does not need too complicated circuit structure, has further simplified internal circuit, has reduced the cost of manufacture of release.
Described pressure unit 4 comprises several resistance R, and described resistance R is electrically connected with switching circuit 1 after connecting successively.
By adopting technique scheme, connect and just can reach a good dividing potential drop effect by resistance R, just can carry the voltage of coming to carry out step-down compression limiter 3, can better give tripping coil T power supply.
Described switching circuit 1 comprises A phase triode QA, B phase triode QB and C phase triode QC, described A phase triode QA base stage is electrically connected with A phase pressure limiting circuit 21, described B phase triode QB base stage is electrically connected with B phase pressure limiting circuit 22, described B phase triode QB collector electrode is electrically connected with A phase triode QA emitter, described C phase triode QC base stage is electrically connected with C phase pressure limiting circuit 23, described C phase triode QC collector electrode is electrically connected with B phase triode QB emitter, described A phase triode QA collector electrode is electrically connected with tripping coil T, described C phase triode QC grounded emitter.
By adopting technique scheme, so just can be by A, B, C, the pressure limiting circuit 2 of three-phase is independent, and arrange by above, just make three triodes be together in series, when a certain appearance mutually under-voltage time wherein, corresponding triode will disconnect, whole switching circuit 1 will disconnect, tripping coil T produces the action of threading off, just can reach when three-phase electricity is wherein any one when occurring under-voltage problem mutually, tripping coil T just can produce the action of threading off timely and effectively, effectively protection three-phase electricity circuit, wherein the preferred NPN type of the triode triode here, represent that model is 9013 triodes.
Described tripping coil T is parallel with diode D.
By adopting technique scheme, in the time of tripping coil T power-off, can induce a recoil electric current, the setting of the diode D electric current that just can effectively prevent from recoiling backwashes to triode, burns out triode.
The utlity model has following advantage: whether detect three-phase electricity in under-voltage condition by pressure limiting circuit 2, carry out control switch circuit 1 by pressure limiting circuit 2, switching circuit 1 is controlled tripping coil T again, just can reach detection three-phase electricity and protect the effect of three-phase electricity, just a main control chip need to be set in inside and control, in the time that release is linked in three-phase electricity, three-phase electricity applies voltage will to pressure limiting circuit 2, pressure limiting circuit 2 will carry out pressure limiting by the voltage that is input to device for under-voltage releasing equipment of three-phase electricity, and then through pressure unit 4 step-downs, three-phase electricity after step-down is input among switching circuit 1, power to switching circuit 1, because pressure limiting circuit 2 comprises A phase pressure limiting circuit 21, B phase pressure limiting circuit 22 and C phase pressure limiting circuit 23, A, B, C pressure limiting circuit 2 includes pressure unit 4 and the compression limiter 3 for being electrically connected with three-phase electricity, compression limiter 3 is electrically connected with pressure unit 4, pressure unit 4 is electrically connected with switching circuit 1, switching circuit 1 is electrically connected with tripping coil T, when A phase or B phase or C occur under-voltage time mutually, will cause the output voltage of pressure limiting circuit 2 to change, switching circuit 1 will disconnect, tripping coil T will power-off, the action of threading off, so just can reach and when three-phase electricity one road is under-voltage, produce in time the action of threading off, the equipment that protection is electrically connected with three-phase electricity, just need to a control chip be set in internal circuit, internal circuit and the cost of manufacture that has reduced release are simplified.
The above is only preferred implementation of the present utility model, and protection range of the present utility model is also not only confined to above-described embodiment, and all technical schemes belonging under the utility model thinking all belong to protection range of the present utility model.It should be pointed out that for those skilled in the art, in the some improvements and modifications that do not depart under the utility model principle prerequisite, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (5)
1. a three-phase device for under-voltage releasing equipment, comprise switching circuit, tripping coil, pressure limiting circuit for being electrically connected with three-phase electricity, it is characterized in that: described pressure limiting circuit comprises A phase pressure limiting circuit, B phase pressure limiting circuit and C phase pressure limiting circuit, described A, B, C pressure limiting circuit include pressure unit and the compression limiter for being electrically connected with three-phase electricity, described compression limiter is electrically connected with pressure unit, described pressure unit is all electrically connected with switching circuit, and described switching circuit is electrically connected with tripping coil.
2. three-phase device for under-voltage releasing equipment according to claim 1, is characterized in that: described compression limiter comprises pressure limiting resistance, described pressure limiting resistance is in parallel with pressure unit.
3. three-phase device for under-voltage releasing equipment according to claim 2, is characterized in that: described pressure unit comprises several resistance, described resistance is electrically connected with switching circuit after connecting successively.
4. three-phase device for under-voltage releasing equipment according to claim 3, it is characterized in that: described switching circuit comprises A phase triode, B phase triode and C phase triode, described A phase transistor base is electrically connected with A phase pressure limiting circuit, described B phase transistor base is electrically connected with B phase pressure limiting circuit, described B phase transistor collector is electrically connected with the emitter of A phase triode, described C phase transistor base is electrically connected with C phase pressure limiting circuit, described C phase transistor collector is electrically connected with B phase transistor emitter, described A phase transistor collector is electrically connected with tripping coil, described C phase transistor emitter ground connection.
5. according to the three-phase device for under-voltage releasing equipment described in claim 1 or 2 or 3 or 4, it is characterized in that: described tripping coil is parallel with diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420178490.XU CN203826924U (en) | 2014-04-14 | 2014-04-14 | Three-phase undervoltage release |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420178490.XU CN203826924U (en) | 2014-04-14 | 2014-04-14 | Three-phase undervoltage release |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203826924U true CN203826924U (en) | 2014-09-10 |
Family
ID=51482387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420178490.XU Expired - Fee Related CN203826924U (en) | 2014-04-14 | 2014-04-14 | Three-phase undervoltage release |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203826924U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016116517A1 (en) | 2016-09-05 | 2018-03-08 | Eaton Electrical Ip Gmbh & Co. Kg | Method and device for disconnecting an AC voltage circuit in case of undervoltage |
-
2014
- 2014-04-14 CN CN201420178490.XU patent/CN203826924U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016116517A1 (en) | 2016-09-05 | 2018-03-08 | Eaton Electrical Ip Gmbh & Co. Kg | Method and device for disconnecting an AC voltage circuit in case of undervoltage |
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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: 20140910 Termination date: 20160414 |