CN2173471Y

CN2173471Y - Domestic universal electricity protector

Info

Publication number: CN2173471Y
Application number: CN 93240945
Authority: CN
Inventors: 刘在能
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-10-01
Filing date: 1993-10-01
Publication date: 1994-08-03
Anticipated expiration: 2003-10-01

Abstract

The utility model relates to a domestic universal electricity protector, which is provided with a current detecting element, an electronic switch, a DC rectification circuit, an actuating mechanism, etc., wherein, the current detecting element is a zero sequence current transformer T, the electronic switch is a thyristor SCR, and the actuating mechanism is a detacher K. The current which pass through the two first coils of the zero sequence current transformer is not balanceable, so the conduction of the thyristor is triggered to enable the actuating mechanism to act; thereby, the domestic universal electricity protector obtains a protection purpose. The utility model has the advantages of simple structure, complete function and reliable performance.

Description

Domestic universal electricity protector

The utility model belongs to a kind of household electrical appliance protection and personal protective device.

Utility model patent " power pollution Loop Protection inserted block " (91220640.3); commodity BXW household appliances insurance by name king; it is a kind of power protector that utilizes the short-circuit protection method to carry out electric prospection; its action principle mainly is when the power supply overvoltage; make power supply force short circuit by system's control; the short circuit current of the Yin Faing fuse melting of will registering one's residence thus, thus make power cut-off protection power consumption equipment.As everyone knows; short circuit current is too big; should avoid under the normal condition as far as possible; and this device depends on the correct configuration of the insurance of registering one's residence; and current electricity consumer also has a lot of problems to the correct configuration of fuse; some in addition substitute with copper wire; so; the insurance king sometimes conversely even can become the fire king; do not have protective effect, simultaneously, this device only can shield to overvoltage and thunder and lightning at all; and all can not shielding, thereby function singleness to overcurrent, overload, leakage, electric shock etc.

The register one's residence protected mode of fuse of this dependence that the purpose of this utility model is to change the insurance king provides a kind of all-round protector of household electricity that all can play better protective effect to overcurrent, overvoltage, leak shock and thunder and lightning etc.

Major technique measure of the present utility model is as follows:

The all-round protector of a kind of household electricity has current measuring element, electronic switch, direct current rectification circuit and actuator, and current measuring element is zero sequence current mutual inductor T, two primary coil L of zero sequence current mutual inductor T ₁And L ₂Be serially connected on the live wire and ground wire of power supply service wire, electronic switch is a controllable silicon SCR, the secondary coil L of the gate pole of controllable silicon SCR and zero sequence current mutual inductor T ₃Be electrically connected, its anode and negative electrode are connected on respectively on the positive and negative output of direct current rectification circuit, and described actuator is detacher K, two normally-closed contact K of detacher K _1-1Be serially connected in the front portion of power supply service wire.

Its operation principle is as follows: under the normal condition, and the primary coil L of the zero sequence current mutual inductor T that flows through ₁, L ₂In size of current equate, direction is opposite, magnetic flux equal and opposite in direction, the direction responded in two coils are opposite, total magnetic flux is zero, secondary coil L ₃In non-inductive output, controllable silicon SCR is blocked, detacher K attonity, when leak, when getting an electric shock, owing to form the loop thereby the zero sequence current mutual inductor T primary coil L that flows through over the ground ₁, L ₂In current potential must not wait, thereby total magnetic flux is non-vanishing, secondary coil L ₃In output signal trigger the controllable silicon SCR conducting, make detacher K get electronic work, its normally-closed contact K _1-1Disconnect, block power supply.Contact K _1-1After the disconnection,, manually make detacher K again by fixing a breakdown _1-1Normally-closed contact reset.

The utility model is simple in structure, and dependable performance does not rely on the fuse of registering one's residence.

Following accompanying drawing provides an embodiment of the present utility model:

Fig. 1 is the all-round protector electrical schematic diagram of household electricity.

Below in conjunction with accompanying drawing the utility model is further described:

The all-round protector of a kind of household electricity has current measuring element, electronic switch, direct current rectification circuit and actuator, and current measuring element is zero sequence current mutual inductor T, two primary coil L of zero sequence current mutual inductor T ₁And L ₂Be serially connected in respectively on the live wire and ground wire of power supply service wire, electronic switch is a controllable silicon SCR, the secondary coil L of the gate pole of controllable silicon SCR and zero sequence current mutual inductor T ₃Be electrically connected, its anode and negative electrode are connected on respectively on the positive and negative output of direct current rectification circuit, and the direct current rectification circuit is by diode VD ₁-VD ₄The bridge rectifier of forming, described actuator is detacher K, two normally-closed contact K of detacher K _1-1Be serially connected in the front portion of power supply service wire.

Two primary coil L of zero sequence current mutual inductor T ₁, L ₂Between connected an overcurrent and load short circuits testing circuit, this circuit is by tongue tube JAG-4 and resistance R ₁Form the primary coil L of the solenoid of tongue tube JAG-4 and zero sequence current mutual inductor T ₁Series connection, the contact of tongue tube JAG-4 and resistance R ₁Series connection, the two ends of series arm are connected to zero sequence current mutual inductor T primary coil L ₂Top and L ₁End.

Its operation principle is as follows: when electric current surpassed the current setting value of tongue tube JAG-4, the contacting of tongue tube JAG-4 passed through resistance R ₁Primary coil L to zero sequence current mutual inductor T ₂Form diverter branch, make the primary coil L that flows through ₁, L ₂In electric current unequal, thereby make secondary coil L ₃Output signal triggers the controllable silicon SCR conducting, and detacher K gets electric, its normally-closed contact K _1-1Disconnect, cut off power supply.

Can simulation test switch S B in parallel on the contact of tongue tube JAG-4, with simulation overcurrent and load short circuits situation, the reliability of test macro action.

At zero sequence current mutual inductor T primary coil L ₂Top and L ₁End between can connect an overvoltage and lightning protected circuit, this circuit is by three piezo-resistance YM ₁-YM ₃Form piezo-resistance YM ₁And YM ₂Series connection back and YM ₃Parallel connection, piezo-resistance YM ₁With YM ₂Tie point ground connection.

Its operation principle is as follows: under the situation of normal power supply, promptly line voltage is normal and when not having thunder and lightning and attacking, because of piezo-resistance YM ₁-YM ₃Impedance is very high, so wherein basic no current passes through system's attonity.More than line voltage is elevated to the critical value of setting for some reason or lightning voltage when surpassing this critical value, piezo-resistance YM ₃Impedance, sharply descend, overvoltage is just flow through piezo-resistance YM with the form of discharging current ₃, this electric current promptly is the residual current in the zero sequence current mutual inductor T primary coil, causes flowing through primary coil L like this ₁, L ₂In size of current unequal, at secondary coil L ₃Middle induction output signal, this signal triggering controllable silicon SCR conducting makes detacher K get electronic work, its normally-closed contact K _1-1Disconnect, cut off power supply circuits and localpower.

Equally, when thunder and lightning attacks, piezo-resistance YM ₁-YM ₃Impedance all sharply descend, power supply circuits promptly can become diverter branch by megarelief, are equivalent to a fiery ground, equally also can make secondary coil L ₃Output signal triggers the controllable silicon SCR conducting, cuts off power supply by detacher K, thereby has realized triple protection.

Gate pole current potential for the restriction controllable silicon SCR does not damage it because of too high, the utility model can be at the secondary coil L of zero sequence current mutual inductor T ₃And insert one between the controllable silicon SCR gate pole by resistance R ₂And R ₃The dividing potential drop branch road of forming can insert filter capacitor C simultaneously in the triggering loop of controllable silicon SCR ₁And C ₂

The utility model integrates kinds of protect such as overcurrent, overvoltage, thunder and lightning, leak shock, and is multiple functional, dependable performance, and also simple in structure, cheap for manufacturing cost.

Claims

1, the all-round protector of a kind of household electricity is characterized in that it has current measuring element, electronic switch, direct current rectification circuit and actuator, and current measuring element is zero sequence current mutual inductor T, two primary coil L of zero sequence current mutual inductor T ₁And L ₂Be serially connected on the live wire and ground wire of power supply service wire, electronic switch is a controllable silicon SCR, the secondary coil L of the gate pole of controllable silicon SCR and zero sequence current mutual inductor T ₃Be electrically connected, its anode and negative electrode are connected on respectively on the positive and negative output of direct current rectification circuit, and described actuator is detacher K, two normally-closed contact K of detacher K _1-1Be serially connected in the front portion of power supply service wire.

2, all-round protector according to claim 1 is characterized in that polar curve circle L at the beginning of two of zero sequence current mutual inductor T ₁, L ₂Between connected an overcurrent and load short circuits testing circuit, this circuit is by tongue tube JAG-4 and resistance R ₁Form the primary coil L of the solenoid of tongue tube JAG-4 and zero sequence current mutual inductor T ₁Series connection, the contact of tongue tube JAG-4 and resistance R ₁Series connection, the two ends of series arm are connected to zero sequence current mutual inductor T primary coil L ₂Top and L ₁End.

3, all-round protector according to claim 1 and 2 is characterized in that at zero sequence current mutual inductor T primary coil L ₂Top and L ₁End between connected an overvoltage and lightning protected circuit, this circuit is by three piezo-resistance YM ₁-YM ₃Form piezo-resistance YM ₁, and YM ₂Series connection back and YM ₃Parallel connection, piezo-resistance YM ₁With YM ₂Tie point ground connection.

4, all-round protector according to claim 1 is characterized in that the secondary coil L at zero sequence current mutual inductor T ₃And inserted one between the controllable silicon SCR gate pole by resistance R ₂And R ₃The bleeder circuit of forming.

5, all-round protector according to claim 2 is characterized in that in two ends, the contact parallel connection of tongue tube JAG-4 a simulation test switch S B.