CN202424113U

CN202424113U - Over-voltage leakage protection device

Info

Publication number: CN202424113U
Application number: CN2012200666061U
Authority: CN
Inventors: 杨海军
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-02-28
Filing date: 2012-02-28
Publication date: 2012-09-05
Anticipated expiration: 2022-02-28

Abstract

The utility model discloses an over-voltage leakage protection device, which comprises a switch contact J-KG, a zero-sequence current transformer TAN, a tripper TQ, a leakage test circuit and a control circuit. The control circuit comprises a piezoresistor RV, a resistor R1, a diode D1, a capacitor C1, controlled silicon VT and a bridge rectifier UR, wherein the piezoresistor RV penetrates through the zero-sequence current transformer TAN, and is connected to a power supply output L-OUT end and N-out end. The over-voltage leakage protection device is mainly applied to an AC 50HZ220V single-phase circuit; through the over-voltage leakage protection device, the power supply is safely, reliably and exactly cut off, and subordinate electrical equipment and personnel safety are protected; and the over-voltage leakage protection device is suitable for fields of a power system low-voltage switch.

Description

The overvoltage earth leakage protective device

Technical field

The utility model relates to a kind of overvoltage earth leakage protective device, is applicable to electric power system low tension switch field.

Background technology

At present; Switch on the market, tripper generally only possess overcurrent; Leakage, breaking, short-circuit protection function, but do not possess the overvoltage function of cutting off the electricity supply automatically, owing to reason voltage instantaneous such as zero line open circuit, misconnection raise; Cause a lot of household electrical appliance to burn out, even influence user's personal safety.

Summary of the invention

The purpose of the utility model provides a kind of overvoltage earth leakage protective device, has the overvoltage creepage protection function, can prevent that overtension from burning out electrical equipment, reaches the protection person and security appliance.

The purpose of the utility model is achieved in that a kind of overvoltage earth leakage protective device; Comprise switch contact J-KG, zero sequence current mutual inductor TAN, release TQ, leakage tests circuit and control circuit, control circuit comprise piezo-resistance RV, resistance R 1, diode D1, capacitor C 1, controllable silicon VT and rectifier bridge heap UR; Piezo-resistance RV passes zero sequence current mutual inductor TAN; Be connected on the L-OUT end and N-OUT end of power supply output, zero sequence current mutual inductor TAN and resistance R 1, diode D1 and capacitor C 1 are in parallel, and capacitor C 1 one ends link to each other with controllable silicon VT control utmost point G; The other end links to each other with controllable silicon VT cathode terminal; The controllable silicon VT input utmost point links to each other with rectifier bridge heap UR output head anode, and rectifier bridge heap UR negative pole of output end links to each other with controllable silicon VT cathode terminal, and rectifier bridge heap UR ac input end one end links to each other with power supply output L-OUT end; The rectifier bridge heap UR ac input end other end links to each other with release TQ one end; The release TQ other end links to each other with power output end N-OUT end, and release TQ links to each other with switch contact J-KG through linkage, and switch contact J-KG is installed on power supply input L-IN end and the power supply input N-IN end; Described leakage tests circuit comprises leakage tests switch LD-TEST and resistance R 2, passes after 2 series connection of leakage tests switch LD-TEST and resistance R on L-OUT end that zero sequence current mutual inductor TAN is connected on power supply output and the N-OUT end.

The utility model overvoltage earth leakage protective device has overcome tripper in the market and has lacked overvoltage protection, influences defectives such as user's property and personal safety because of the civil power voltage rise is high.

The beneficial effect of the utility model is: simple in structure, cost of manufacture is low, and is convenient for installation and maintenance.

Description of drawings

Fig. 1 is the circuit diagram of the utility model.

Embodiment

Referring to accompanying drawing 1, a kind of overvoltage earth leakage protective device comprises switch contact J-KG; Zero sequence current mutual inductor TAN, release TQ, leakage tests circuit and control circuit; Control circuit comprises piezo-resistance RV, resistance R 1, diode D1, capacitor C 1, controllable silicon VT and rectifier bridge heap UR, and piezo-resistance RV passes zero sequence current mutual inductor TAN, is connected on the L-OUT end and N-OUT end of power supply output; Zero sequence current mutual inductor TAN and resistance R 1, diode D1 and capacitor C 1 are in parallel; Capacitor C 1 one ends link to each other with controllable silicon VT control utmost point G, and the other end links to each other with controllable silicon VT cathode terminal, and the controllable silicon VT input utmost point links to each other with rectifier bridge heap UR output head anode; Rectifier bridge heap UR negative pole of output end links to each other with controllable silicon VT cathode terminal; Rectifier bridge heap UR ac input end one end links to each other with power supply output L-OUT end, and the rectifier bridge heap UR ac input end other end links to each other with release TQ one end, and the release TQ other end links to each other with power output end N-OUT end; Release TQ links to each other with switch contact J-KG through linkage, and switch contact J-KG is installed in power supply input L-IN end and imports on the N-IN end with power supply; Described leakage tests circuit comprises leakage tests switch LD-TEST and resistance R 2, passes after 2 series connection of leakage tests switch LD-TEST and resistance R on L-OUT end that zero sequence current mutual inductor TAN is connected on power supply output and the N-OUT end.

Work as 50HZ, when 220V power input voltage surpasses rated voltage, wherein have overvoltage collapse piezo-resistance RV and move rapidly; Give current signal of zero sequence current mutual inductor TAN, convert a voltage signal into by zero sequence current mutual inductor TAN, voltage signal is through resistance R 1, capacitor C 1, diode D1 rectifying and wave-filtering; Signal voltage is delivered to the controllable silicon VT control utmost point G utmost point; Make controllable silicon VT conducting, release QT obtains the voltage action, impels the rapid disconnecting consumers of switch contact J-KG.Wherein resistance R 2 is a test resistance, uses when leakage tests switch LD-TEST does test.

Claims

1. overvoltage earth leakage protective device; It is characterized in that comprising switch contact J-KG, zero sequence current mutual inductor TAN, release TQ, leakage tests circuit and control circuit; Control circuit comprises piezo-resistance RV, resistance R 1, diode D1, capacitor C 1, controllable silicon VT and rectifier bridge heap UR; Piezo-resistance RV passes on L-OUT end that zero sequence current mutual inductor TAN is connected on power supply output and the N-OUT end, and zero sequence current mutual inductor TAN and resistance R 1, diode D1 and capacitor C 1 are in parallel, and capacitor C 1 one ends are controlled utmost point G with controllable silicon VT and linked to each other; The other end links to each other with controllable silicon VT cathode terminal; The controllable silicon VT input utmost point links to each other with rectifier bridge heap UR output head anode, and rectifier bridge heap UR negative pole of output end links to each other with controllable silicon VT cathode terminal, and rectifier bridge heap UR ac input end one end links to each other with power supply output L-OUT end; The rectifier bridge heap UR ac input end other end links to each other with release TQ one end; The release TQ other end links to each other with power output end N-OUT end, and release TQ links to each other with switch contact J-KG through linkage, and switch contact J-KG is installed on power supply input L-IN end and the power supply input N-IN end; Described leakage tests circuit comprises leakage tests switch LD-TEST and resistance R 2, passes after 2 series connection of leakage tests switch LD-TEST and resistance R on L-OUT end that zero sequence current mutual inductor TAN is connected on power supply output and the N-OUT end.