CN201238190Y

CN201238190Y - Earth leakage circuit breaker for zero wire break

Info

Publication number: CN201238190Y
Application number: CNU200820025534XU
Authority: CN
Inventors: 王海龙; 孙泽林
Original assignee: SHANDONG QILUSHIHUA KAITAI INDUSTRY Co Ltd
Current assignee: Shandong Kaitai Petrochemical Co., Ltd.
Priority date: 2008-07-08
Filing date: 2008-07-08
Publication date: 2009-05-13
Anticipated expiration: 2018-07-08

Abstract

The utility model discloses a broken zero earth leakage circuit breaker and belongs to the field of a power-inlet protection device for family and office occasions. The broken zero earth leakage circuit breaker comprises a main switch (1) and a zero-sequence current transformator; the zero-sequence current transformator TQ)(2) is arranged on the outgoing line end of the main switch (1); a test button device (3) is arranged between a front line (L) and a zero line N; the utility model is characterized in that the assistant normal open contact point (6) of an overvoltage relay is connected with the test button device (3) in parallel; an overvoltage relay U>(4) is arranged between the zero line N and a ground wire PE; and a creepage release (5) is arranged on the main switch (1). The broken zero earth leakage circuit breaker is simple in structure, is safe, is conveniently mounted and used, can effectively avoid an electronic apparatus from being burnt due to the breaking of the zero line, which causes larger economic loss to families, enterprises and institutions, and has the functions of creepage, overloading, short circuit, broken zero protections and manually conducted circuit.

Description

Disconnected zero earth leakage circuit breaker

Technical field

Disconnected zero earth leakage circuit breaker belongs to family and office space and enters the electrical protective device field.

Background technology

General family and office space electricity consumption all are single-phase electricity consumption 220VAC, star connection for threephase load, the used load of every family and each office is different certainly, just three-phase line voltage EA, EB, EC are always uneven, for three-phase four-wire power supply, when operate as normal, if zero line N disconnects, can make the normal phase voltage of that big terminal voltage of load low, the normal phase voltage height of that the little terminal voltage of loading, like this, a large amount of household electricity equipment or the office power consumption equipment higher than phase voltage will be burnt, and cause than large economy and lose.Though earth leakage protective device all is housed now, but still can not avoids the generation of above-mentioned accident.

Evidence, neutral line break before the consumer main switch end of incoming cables, back institute bringing onto load is equivalent to be connected between live wire and another live wire so, and like this, load terminal voltage is greater than 220VAC, and electrical equipment will be burnt.

The utility model content

The technical problems to be solved in the utility model is: overcome the problem that prior art exists, design a kind of simple in structurely, easy to install, can effectively avoid burning because of neutral line break disconnected zero earth leakage circuit breaker of electrical equipment.

The technical problems to be solved in the utility model is: this disconnected zero earth leakage circuit breaker; comprise main switch, zero sequence current mutual inductor; at main switch power outlet end; zero sequence current mutual inductor TQ is installed; installation test pushbutton unit between live wire L and zero line N; it is characterized in that: the auxiliary normally opened contact of overvoltage relay in parallel on the test button device, overvoltage relay U is installed between zero line N and ground wire PE 〉, leakage tripping device is installed on main switch.

Operation principle

On the basis of earth leakage protective device, increase a relay that detects voltage; the voltage that it detects is the voltage between zero line N and the ground wire PE; under the normal condition; there is not voltage between zero line N and the ground wire PE; and when total zero line break; to have a relative higher voltage between them, after this higher voltage produces, earth leakage protective device is moved protect with power consumption equipment.

Compared with prior art; the beneficial effect that disconnected zero earth leakage circuit breaker of the utility model is had is: simple in structure, safe, easy to install; can effectively avoid because of neutral line break burns electrical equipment, cause than large economy for family and enterprises and institutions and lose.Have electric leakage, overload, short circuit, the disconnected zero function that reaches manual on-off circuit.

Description of drawings

Fig. 1 is the structural representation of disconnected zero earth leakage circuit breaker of the single-phase two-stage of the utility model;

Fig. 2 is supply line's configuration scheme of installation.

Fig. 1-2 is a most preferred embodiment of the present utility model.

Wherein: 1 main switch, 2 zero sequence current mutual inductor TQ, 3 test button devices, 4 overvoltage relay U〉the auxiliary normally opened contact 7 of 5 leakage tripping devices, 6 relays is used electric loading.

Embodiment

Below in conjunction with accompanying drawing 1-2 disconnected zero earth leakage circuit breaker of the present utility model is described further:

With reference to Fig. 1

This disconnected zero earth leakage circuit breaker is by main switch 1, zero sequence current mutual inductor TQ 2, test button device 3, overvoltage relay U〉4, leakage tripping device 5, the auxiliary normally opened contact 6 of relay form.At main switch 1 power outlet end, zero sequence current mutual inductor TQ 2 is installed, installation test pushbutton unit 3 between live wire L and zero line N, the auxiliary normally opened contact 6 of overvoltage relay in parallel on test button device 3, overvoltage relay U is installed between zero line L and ground wire N〉4, leakage tripping device 5 is installed on main switch 1.Be installed in family and electricity consumption end of incoming cables, office space,, play household electrical appliance overload, short circuit and disconnected zero defencive function as master switch.When top, switch end of incoming cables zero line N opens circuit; can be between live wire and live wire with electric loading 7 by string; zero line current potential after total neutral line break is sentenced raises; produce voltage between zero line N after promptly being disconnected and the ground wire PE; like this; voltage relay U〉4 electric suction and; voltage relay U〉4 auxiliary normally opened contact 6 closures; make zero sequence current mutual inductor TQ2 produce electric current; amplify through amplifier; through executive component leakage tripping device 5 main switch 1 is threaded off again, cut off the electricity supply, resolve zero protective effect thereby play.

With reference to Fig. 2

Shown in Figure 2 is the configuration of present supply line, if break at zero line N 1. or 1., back institute bringing onto load is equivalent to be connected between live wire and another live wire so, and like this, the electricity consumption load terminal voltage is greater than 220VAC, and electrical equipment will be burnt.As 2. breaking, the usefulness electric loading of back will be series between L1 and L2 two live wires so, and same, the electricity consumption load terminal voltage can be greater than 220VAC, and electrical equipment still can be burnt.Between live wire L1-L3 and zero line N, insert this disconnected zero earth leakage circuit breaker respectively; when top, switch end of incoming cables zero line N opens circuit; overvoltage relay U〉electric suction and; voltage relay U〉auxiliary normally opened contact closure; make zero sequence current mutual inductor TQ produce electric current, amplify, through the executive component leakage tripping device main switch is threaded off again through amplifier; cut off the electricity supply, resolve zero protective effect thereby play.

Claims

1, disconnected zero earth leakage circuit breaker; comprise main switch, zero sequence current mutual inductor; at main switch (1) power outlet end; zero sequence current mutual inductor TQ (2) is installed; installation test pushbutton unit (3) between live wire (L) and zero line N; it is characterized in that: go up the auxiliary normally opened contact (6) of overvoltage relay in parallel at test button device (3), overvoltage relay U is installed between zero line N and ground wire PE (4), go up installation leakage tripping device (5) at main switch (1).