CN204407861U - A kind of Low-Voltage Leakage Protection - Google Patents
A kind of Low-Voltage Leakage Protection Download PDFInfo
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- CN204407861U CN204407861U CN201520145608.3U CN201520145608U CN204407861U CN 204407861 U CN204407861 U CN 204407861U CN 201520145608 U CN201520145608 U CN 201520145608U CN 204407861 U CN204407861 U CN 204407861U
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Abstract
The utility model discloses a kind of Low-Voltage Leakage Protection, comprise switch contact K, zero sequence current mutual inductor TAN, release TQ, leakage tests circuit, over-voltage detection circuit and control circuit; Control circuit comprises piezo-resistance RV, resistance R1, diode D1, electric capacity C1, controllable silicon VT and rectifier bridge stack UR, piezo-resistance RV is through zero sequence current mutual inductor TAN, be connected on the L-OUT end of power supply output with on N-OUT end, zero sequence current mutual inductor TAN and resistance R1, diode D1 and electric capacity C1 are in parallel, electric capacity C1 one end and controllable silicon VT control pole G and are connected, the other end is connected with controllable silicon VT cathode terminal, and controllable silicon VT inputs pole and is connected with rectifier bridge stack UR output head anode.The utility model has reliable operation, circuit structure is simple, the features such as cost of manufacture is low, use safety.
Description
Technical field
The utility model relates to electric power system low tension switch field, is specially a kind of Low-Voltage Leakage Protection.
Background technology
At present, switch on market, tripper generally only possess overcurrent, leakage, breaking, short-circuit protection function, but do not possess overvoltage automatic cut-off power function, because the reason such as zero-line open-circuit, misconnection voltage instantaneous raises, cause a lot of household electrical appliance to burn out, even affect the personal safety of user, not only cause very large economic loss to user but also cause user and electric power enterprise electricity consumption dispute; And adopt single overvoltage protection mode easily to occur failure conditions, urgently improve.
Utility model content
The purpose of this utility model is to provide a kind of Low-Voltage Leakage Protection, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of Low-Voltage Leakage Protection, comprises switch contact K, zero sequence current mutual inductor TAN, release TQ, leakage tests circuit, over-voltage detection circuit and control circuit, control circuit comprises piezo-resistance RV, resistance R1, diode D1, electric capacity C1, controllable silicon VT and rectifier bridge stack UR, piezo-resistance RV is through zero sequence current mutual inductor TAN, be connected on the L-OUT end of power supply output with on N-OUT end, zero sequence current mutual inductor TAN and resistance R1, diode D1 and electric capacity C1 is in parallel, electric capacity C1 one end and controllable silicon VT control pole G and are connected, the other end is connected with controllable silicon VT cathode terminal, controllable silicon VT inputs pole and is connected with rectifier bridge stack UR output head anode, rectifier bridge stack UR negative pole of output end is connected with controllable silicon VT cathode terminal, rectifier bridge stack UR ac input end one end and power supply export L-OUT and hold and be connected, the rectifier bridge stack UR ac input end other end is connected with release TQ one end, the release TQ other end is held with power output end N-OUT and is connected, described leakage tests circuit comprises leakage tests switch S 1 and resistance R2, is connected on the L-OUT end of power supply output with on N-OUT end after leakage tests switch S 1 and resistance R2 connect through zero sequence current mutual inductor TAN, over-voltage detection circuit is parallel with at the node at leakage tests switch S 1 two ends, over-voltage detection circuit is the resitstance voltage divider be composed in series by resistance RX1 and resistance R3, resistance RX1 is positioned at cold end, component voltage on resistance R1X exports the control pole of bidirectional triode thyristor Q1 to, resistance RX1 two end node shunt capacitance C2.
As the utility model further technical scheme, described release TQ is connected with switch contact K by linkage.
As the utility model further technical scheme, described switch contact K is arranged on power supply input L-IN end and inputs on N-IN end with power supply.
As the utility model further technical scheme, described resistance RX1 is adjustable resistance.
Compared with prior art, whether the utility model is transfinited by over-voltage detection circuit detection earth leakage protective device input voltage controls electronic switch break-make, thus control simulation leakage current produces path and the open circuit in loop, work as 50HZ, when 220V power input voltage exceedes rated voltage, wherein there is the rapid action of overvoltage collapse piezo-resistance RV, to zero sequence current mutual inductor TAN current signal, a voltage signal is converted to by zero sequence current mutual inductor TAN, voltage signal is through resistance R1, electric capacity C1, diode D1 rectifying and wave-filtering, signal voltage is delivered to controllable silicon VT and control G pole, pole, make controllable silicon VT conducting, release QT obtains voltage operation, impel the rapid disconnecting consumers of switch contact, the utility model has reliable operation, circuit structure is simple, cost of manufacture is low, the features such as use safety.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of a kind of Low-Voltage Leakage Protection of the utility model.
Embodiment
Be described in more detail below in conjunction with the technical scheme of embodiment to this patent.
Refer to Fig. 1, a kind of Low-Voltage Leakage Protection, comprise switch contact K, zero sequence current mutual inductor TAN, release TQ, leakage tests circuit, over-voltage detection circuit and control circuit, control circuit comprises piezo-resistance RV, resistance R1, diode D1, electric capacity C1, controllable silicon VT and rectifier bridge stack UR, piezo-resistance RV is through zero sequence current mutual inductor TAN, be connected on the L-OUT end of power supply output with on N-OUT end, zero sequence current mutual inductor TAN and resistance R1, diode D1 and electric capacity C1 is in parallel, electric capacity C1 one end and controllable silicon VT control pole G and are connected, the other end is connected with controllable silicon VT cathode terminal, controllable silicon VT inputs pole and is connected with rectifier bridge stack UR output head anode, rectifier bridge stack UR negative pole of output end is connected with controllable silicon VT cathode terminal, rectifier bridge stack UR ac input end one end and power supply export L-OUT and hold and be connected, the rectifier bridge stack UR ac input end other end is connected with release TQ one end, the release TQ other end is held with power output end N-OUT and is connected, release TQ is connected with switch contact K by linkage, switch contact K is arranged on power supply input L-IN end and inputs on N-IN end with power supply, described leakage tests circuit comprises leakage tests switch S 1 and resistance R2, is connected on the L-OUT end of power supply output with on N-OUT end after leakage tests switch S 1 and resistance R2 connect through zero sequence current mutual inductor TAN, over-voltage detection circuit is parallel with at the node at leakage tests switch S 1 two ends, over-voltage detection circuit is the resitstance voltage divider be composed in series by resistance RX1 and resistance R3, resistance RX1 is positioned at cold end, component voltage on resistance R1X exports the control pole of bidirectional triode thyristor Q1 to, in the present embodiment, resistance RX1 is adjustable resistance, resistance RX1 two end node shunt capacitance C2.
Work as 50HZ, when 220V power input voltage exceedes rated voltage, wherein there is the rapid action of overvoltage collapse piezo-resistance RV, to zero sequence current mutual inductor TAN current signal, be converted to a voltage signal by zero sequence current mutual inductor TAN, voltage signal is through resistance R1, electric capacity C1, diode D1 rectifying and wave-filtering, signal voltage is delivered to controllable silicon VT and control G pole, pole, make controllable silicon VT conducting, release QT obtains voltage operation, impels the rapid disconnecting consumers of switch contact J-KG.
Overvoltage protection part is formed by bidirectional triode thyristor Q1, adjustable resistance R1, resistance R2, electric capacity C1.Be connected in parallel on former testing button S1 two ends.When voltage is normal by the undertension fallen after adjustable resistance RX1 and resistance R3 dividing potential drop (this voltage can be adjusted by RX1) on adjustable resistance RX1 to trigger Q1 conducting; thus produce loop to simulation leakage current not affect (being in off state), protector normally runs.When (such as: misphase, neutral line break and thunder and lightning etc.) causes the voltage fallen on adjustable resistance RX1 during line over-voltage to be greater than electronic switch threshold value for a certain reason, be enough to trigger bidirectional triode thyristor Q1 conducting.Simulate leakage current generation loop after bidirectional triode thyristor Q1 conducting and be in channel status, be equivalent to press testing button S1, protector tripping operation is cut off the electricity supply then, serves overvoltage protection effect.
Above the better embodiment of this patent is explained in detail, but this patent is not limited to above-mentioned execution mode, in the ken that one skilled in the relevant art possesses, various change can also be made under the prerequisite not departing from this patent aim.
Claims (4)
1. a Low-Voltage Leakage Protection, is characterized in that, comprises switch contact K, zero sequence current mutual inductor TAN, release TQ, leakage tests circuit, over-voltage detection circuit and control circuit, control circuit comprises piezo-resistance RV, resistance R1, diode D1, electric capacity C1, controllable silicon VT and rectifier bridge stack UR, piezo-resistance RV is through zero sequence current mutual inductor TAN, be connected on the L-OUT end of power supply output with on N-OUT end, zero sequence current mutual inductor TAN and resistance R1, diode D1 and electric capacity C1 is in parallel, electric capacity C1 one end and controllable silicon VT control pole G and are connected, the other end is connected with controllable silicon VT cathode terminal, controllable silicon VT inputs pole and is connected with rectifier bridge stack UR output head anode, rectifier bridge stack UR negative pole of output end is connected with controllable silicon VT cathode terminal, rectifier bridge stack UR ac input end one end and power supply export L-OUT and hold and be connected, the rectifier bridge stack UR ac input end other end is connected with release TQ one end, the release TQ other end is held with power output end N-OUT and is connected, described leakage tests circuit comprises leakage tests switch S 1 and resistance R2, is connected on the L-OUT end of power supply output with on N-OUT end after leakage tests switch S 1 and resistance R2 connect through zero sequence current mutual inductor TAN, over-voltage detection circuit is parallel with at the node at leakage tests switch S 1 two ends, over-voltage detection circuit is the resitstance voltage divider be composed in series by resistance RX1 and resistance R3, resistance RX1 is positioned at cold end, component voltage on resistance R1X exports the control pole of bidirectional triode thyristor Q1 to, resistance RX1 two end node shunt capacitance C2.
2. a kind of Low-Voltage Leakage Protection according to claim 1, is characterized in that, described release TQ is connected with switch contact K by linkage.
3. a kind of Low-Voltage Leakage Protection according to claim 1, is characterized in that, described switch contact K is arranged on power supply input L-IN end and inputs on N-IN end with power supply.
4. a kind of Low-Voltage Leakage Protection according to claim 1, is characterized in that, described resistance RX1 is adjustable resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520145608.3U CN204407861U (en) | 2015-03-14 | 2015-03-14 | A kind of Low-Voltage Leakage Protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520145608.3U CN204407861U (en) | 2015-03-14 | 2015-03-14 | A kind of Low-Voltage Leakage Protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204407861U true CN204407861U (en) | 2015-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520145608.3U Expired - Fee Related CN204407861U (en) | 2015-03-14 | 2015-03-14 | A kind of Low-Voltage Leakage Protection |
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| Country | Link |
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| CN (1) | CN204407861U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111786357A (en) * | 2020-07-10 | 2020-10-16 | 广东电网有限责任公司 | Safety protection circuit and power supply wiring board |
-
2015
- 2015-03-14 CN CN201520145608.3U patent/CN204407861U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111786357A (en) * | 2020-07-10 | 2020-10-16 | 广东电网有限责任公司 | Safety protection circuit and power supply wiring board |
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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: 20150617 Termination date: 20170314 |