CN218070998U

CN218070998U - Leakage protector

Info

Publication number: CN218070998U
Application number: CN202221961139.9U
Authority: CN
Inventors: 钱加灿
Original assignee: Yuyao Jiarong Electronic Appliance Co Ltd
Current assignee: Yuyao Jiarong Electronic Appliance Co Ltd
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2022-12-16
Anticipated expiration: 2032-07-27

Abstract

The utility model discloses a leakage protector, which relates to the field of leakage protectors and comprises a tripping module, a zero sequence transformer, an active switch element and a first surge protection module; the tripping module is used for disconnecting the power supply; the zero sequence transformer is used for detecting whether electric leakage exists between the zero line and the live line; the active switch element is in communication connection with the zero sequence transformer; when the zero sequence transformer detects zero line or live line leakage, the active switch element controls the tripping module to disconnect the power supply; the first surge protection module is connected in parallel with two ends of the active switching element and used for transient voltage protection; compared with the prior art, the mutual inductor is directly connected with the controlled silicon, so that a leakage protection chip is omitted, and the cost is reduced; still through parallelly connected first piezo-resistor and parallelly connected second piezo-resistor at the silicon controlled rectifier both ends between zero line and live wire for the hourglass protects can effectively counter the surge, can pass through surge test and preceding pulse test, has reduced the emergence of spurious triggering, and then has improved the security.

Description

Leakage protector

Technical Field

The utility model relates to a earth-leakage protector field especially relates to an earth-leakage protector.

Background

Along with the improvement of living standard, the popularization rate of the leakage protector is higher and higher;

the leakage protection device with ground wire live protection disclosed by the invention CN103178492A in China comprises three poles of a phase line L, a zero line N and a ground wire E with switches, a zero-sequence current transformer, a test circuit, a release, a rectifying circuit, a power supply step-down and a silicon controlled rectifier, wherein the zero-sequence current transformer, the test circuit, the release, the rectifying circuit, the power supply step-down and the silicon controlled rectifier penetrate through the phase line L and the zero line N; although the leakage protection circuit can detect whether the zero line, the live line and the ground line leak electricity or not at the same time, a leakage protection chip needs to be arranged, and the cost is high;

and directly remove the leakage protection chip, can make earth-leakage protector can't pass surge and preceding pulse test, have the potential safety hazard.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved

Aiming at the defects in the prior art, the cost of the leakage protector is reduced, and meanwhile, the safety is improved.

2. Technical scheme

In order to solve the above problems, a leakage protector is provided, which includes a trip module, a zero sequence transformer, an active switching element and a first surge protection module;

the tripping module is used for disconnecting the power supply;

the zero sequence transformer is used for detecting whether the zero line and the live wire are leaked electricity or not;

the active switch element is in communication connection with the zero sequence transformer; when the zero sequence transformer detects zero line or live line leakage, the active switch element controls the tripping module to disconnect the power supply;

the first surge protection module is connected in parallel at two ends of the active switching element and used for transient voltage protection.

The leakage protector further comprises a second surge protection module, the second surge protection module is connected between the live wire and the zero wire in parallel, and the second surge protection module is used for transient voltage protection.

Wherein the active switch element is a thyristor.

The tripping module comprises a tripping coil and a switch, and the switch cuts off a power supply when the tripping coil is electrified.

The first surge protection module and the second surge protection module are piezoresistors.

The leakage protector further comprises a rectifying module, and the rectifying module is used for rectifying alternating current into direct current.

The beneficial effects of the utility model

Compared with the prior art, the utility model has the advantages that the mutual inductor is directly connected with the controlled silicon, so that a leakage protection chip is omitted, and the cost is reduced; still through parallelly connected first piezo-resistor between zero line and live wire and parallelly connected a second piezo-resistor at the silicon controlled rectifier both ends for the hourglass is protected and is effectively confronted with the surge, can pass through surge test and pre-pulse test, has reduced the emergence of spurious triggering, and then has improved the security.

Drawings

Fig. 1 is a schematic diagram of an embodiment of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

As shown in fig. 1, the earth-leakage protector includes a switch S1, a transformer ZCT1, a rectifier bridge D1, a trip coil L1, a thyristor SCR1, a first varistor ZNR1, and a second varistor ZNR2.

The rectifier bridge D1 is used to rectify the alternating current into direct current.

The second piezoresistor ZNR2 is connected in parallel between the zero line and the live line; the first piezoresistor ZNR1 is connected in parallel at two ends of the controllable silicon SCR 1.

When the mutual inductor ZCT1 detects the leakage of a zero line or a live line, the silicon controlled rectifier SCR1 is conducted, so that the trip coil L1 is electrified, and the switch S1 is further enabled to cut off a power supply of a load.

The mutual inductor ZCT1 is directly connected with the silicon controlled rectifier SCR1, so that a leakage protection chip is omitted, and the cost is reduced; still through parallelly connected second piezo-resistor ZNR2 and parallelly connected a first piezo-resistor ZNR1 at silicon controlled rectifier SCR1 both ends between zero line and live wire for leak and protect and effectively to counter the surge, and then make to leak and protect and can pass through surge test and preceding pulse test, reduced the emergence of spurious triggering, and then improved the security.

The above embodiments are only used for illustrating the present invention, and not for limiting the present invention, and those skilled in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention, so that all equivalent technical solutions also belong to the scope of the present invention, and the protection scope of the present invention should be defined by the claims.

Claims

1. A leakage protector is characterized in that the leakage protector comprises a tripping module, a zero sequence transformer (ZCT 1), an active switching element (SCR 1) and a first surge protection module (ZNR 1);

the tripping module is used for disconnecting the power supply;

the zero sequence transformer (ZCT 1) is used for detecting whether the zero line and the live wire are leaked electricity or not;

the active switch element (SCR 1) is in communication connection with the zero sequence transformer (ZCT 1); when the zero-sequence transformer (ZCT 1) detects zero-line or live-line leakage, the active switching element (SCR 1) controls the tripping module to disconnect the power supply;

the first surge protection module (ZNR 1) is connected in parallel to two ends of the active switching element (SCR 1), and the first surge protection module (ZNR 1) is used for transient voltage protection.

2. A earth-leakage protector as claimed in claim 1, characterized in that the earth-leakage protector further comprises a second surge protection module (ZNR 2), the second surge protection module (ZNR 2) being connected in parallel between the live line and the neutral line, the second surge protection module (ZNR 2) being used for transient voltage protection.

3. A leakage protector according to claim 2, characterized in that the active switching element (SCR 1) is a thyristor.

4. A leakage protector according to claim 1, characterized in that the trip module comprises a trip coil (L1) and a switch (S1), the switch (S1) disconnecting the power supply when the trip coil (L1) is energized.

5. A earth-leakage protector as claimed in claim 2, characterized in that the first surge protection module (ZNR 1) and the second surge protection module (ZNR 2) are voltage dependent resistors.

6. A leakage protector according to claim 1, characterized in that it further comprises a rectifying module (D1), said rectifying module (D1) being adapted to rectify an alternating current into a direct current.