CN214314527U

CN214314527U - Leakage protector with trigger breaking function

Info

Publication number: CN214314527U
Application number: CN202023172842.5U
Authority: CN
Inventors: 孙凤军; 杨立志; 杨学东; 白雨河
Original assignee: Civil Aviation Airport Construction Engineering Co Ltd
Current assignee: Civil Aviation Airport Construction Engineering Co Ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-09-28
Anticipated expiration: 2030-12-25

Abstract

The utility model provides a earth-leakage protector with trigger disconnected function, include the zero sequence current transformer by the circuit hookup, compare operational amplifier and experiment button K2, connect through rectifier bridge circuit between zero sequence current transformer and the comparison operational amplifier, three live wire L1 are stretched out to zero sequence current transformer's primary coil, L2, L3, and a zero line N, connect experiment button K2 through the experiment circuit between zero line N and the live wire L3, experiment button K2's the parallelly connected relay KA in both ends, draw forth terminal A by experiment button K2's one end, draw forth terminal B by relay KA's one end, connect RC integrating circuit on the rectifier bridge circuit, RC integrating circuit includes the diode of establishing ties mutually, resistance R and electric capacity C, resistance R and the parallelly connected trigger piece that is used for triggering relay KA in parallel at electric capacity C both ends, draw forth terminal C by the positive terminal of diode. The utility model discloses make the place circuit have the disconnected function of outside trigger branch.

Description

Leakage protector with trigger breaking function

Technical Field

The utility model belongs to the technical field of electrical components, a circuit on-off control is related to, especially a earth-leakage protector with trigger disconnected function.

Background

The existing electric leakage circuit breaker only takes electric leakage detection as a main part, is mainly used for protecting electric shock of a person with fatal danger when equipment has electric leakage faults, has overload and short-circuit protection functions, can be used for protecting overload and short circuit of a circuit or a motor, can also be used for manual infrequent switching starting of the circuit under normal conditions, but does not have a function of realizing automatic breaking of the circuit and connection of a power supply through external circuit triggering, cannot realize first-time separation of the circuit and the power supply under certain special conditions, is limited in use function, and cannot give full play to the performance of the electric leakage circuit breaker.

The problems of the existing residual current circuit breaker are as follows:

1. when a special condition occurs to a related circuit, the problem that the circuit is separated from a power supply cannot be guaranteed at the first time;

2. when special conditions occur in related circuits, remote control cannot be realized.

SUMMERY OF THE UTILITY MODEL

The utility model aims at having the above-mentioned problem to current technique, provided an electric actuation that utilizes relay, lost the disconnected principle of electricity, realized the closed earth-leakage protector who has the disconnected function of trigger branch of experiment button K2 with the simulation of external trigger signal through relay KA normally open contact.

The purpose of the utility model can be realized by the following technical proposal: a leakage protector with a trigger breaking function comprises a zero sequence current transformer, a comparison operational amplifier and an experiment button K2 which are connected by a circuit, wherein the zero sequence current transformer and the comparison operational amplifier are connected by a rectifier bridge circuit, a primary coil of the zero sequence current transformer extends out three live wires L1, L2 and L3 and a zero wire N, the zero wire N and the live wire L3 are connected by the experiment circuit, the experiment button K2 is connected by the experiment circuit, two ends of the experiment button K2 are connected with a relay KA in parallel, a terminal A is led out from one end of the experiment button K2, a terminal B is led out from one end of the relay KA, an RC integrating circuit is connected with the rectifier bridge circuit and comprises a diode, a resistor R and a capacitor C which are connected in series, two ends of the resistor R and the capacitor C are connected in parallel and are used for triggering a trigger piece of the relay KA, and a terminal C is led out from the positive end of the diode.

In this earth-leakage protector with trigger disconnected function, utilize earth-leakage circuit breaker's test button function, when keeping traditional earth-leakage protector internal circuit unchanged with original design, increase RC integrator circuit and relay KA, increase three binding post A, B, C from this, utilize original papers such as relay KA, RC integrator circuit to be as drive circuit, utilize RC integrator circuit's charge-discharge characteristic to realize relay KA normally open contact time delay closed, the time delay is disconnected to guarantee with the accessible linking of outside trigger signal.

The operating principle of the earth leakage protector with the trigger breaking function is that after the earth leakage protector is combined with an external circuit, a control signal (which can be a normally open contact of a relay) of the external circuit is utilized to provide power for a terminal C, the terminal C is charged for a capacitor C through a resistor R after being rectified by a diode, when the voltage of the capacitor end reaches the suction voltage of a relay KA, the normally open contact of the relay KA is closed, the action of the normally open contact of the relay KA and the trigger contact of the external circuit is ensured to form a time sequence, and the function of triggering an experiment button K2 of the external circuit is prepared.

When an external circuit trigger signal (a normally open contact of a relay and the like) is closed, the terminal A and the terminal B are in short circuit by the trigger signal, and the normally open contact of the relay KA is closed at the moment, so that the signal can trigger the function of the experiment button K2, and the automatic breaking of the leakage protector is realized; although the voltage of the terminal C and the main power supply disconnected by the leakage protector are lost at the same time, due to the existence of the capacitor C, the voltages at the two ends of the relay KA cannot disappear immediately, the contact of the relay KA is not disconnected immediately, the relay KA contact is disconnected only when the capacitor C is required to be discharged until the terminal voltage of the capacitor C is lower than the disconnected voltage of the relay KA, the RC integrating circuit is used for ensuring that the action of the normally open contact of the relay KA and the external circuit trigger signal have time sequence delay, and the stability and reliability of the circuit are ensured.

When the leakage protector works normally, the leakage protector is closed, and the original functions of the leakage protector are not affected.

In the leakage protector with the triggering and breaking function, the normally open contact of the relay KA is connected with one end of the experiment button K2.

In the leakage protector with the triggering and breaking function, the triggering piece triggers the normally open contact of the relay KA to be closed through the pull-in voltage.

In the leakage protector with the triggering and breaking function, the terminal a and the terminal B are both triggering signal access ends, and the terminal C is an external power supply access end.

In the leakage protector with the triggering and breaking function, 8 1N4007 diodes are connected in series in a loop in the rectifier bridge circuit.

In the earth leakage protector with the triggering and breaking function, the three live wires L1, L2 and L3 are connected to a protection switch K1.

In the leakage protector with the triggering and breaking function, the test circuit is further connected with a current-limiting resistor in series.

Compared with the prior art, the leakage protector with the triggering and breaking function has the following advantages:

1. the original functions are kept unchanged, the using function of the existing leakage protector is improved, and the circuit has the function of external triggering and breaking.

2. The remote power supply breaking control and the automatic protection control of the related circuit can be realized. The improved residual current circuit breaker can be applied to other automatic control fields and has wide use space.

3. And the transformation of new and old equipment is facilitated.

4. Higher economic value can be created.

Drawings

Fig. 1 is a circuit diagram of the earth leakage protector with the triggering and breaking function.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:

as shown in fig. 1, the earth leakage protector with a trigger breaking function includes a zero sequence current transformer, a comparison operational amplifier and an experiment button K2 which are connected by a circuit, the zero sequence current transformer and the comparison operational amplifier are connected by a rectifier bridge circuit, a primary coil of the zero sequence current transformer extends out of three live wires L1, L2 and L3, and a zero wire N, the zero wire N and the live wire L3 are connected by an experiment circuit to an experiment button K2, two ends of the experiment button K2 are connected with a relay KA in parallel, a terminal a is led out from one end of the experiment button K2, a terminal B is led out from one end of the relay KA, an RC integrating circuit is connected to the rectifier bridge circuit, the RC integrating circuit includes a diode, a resistor R and a capacitor C which are connected in series, a trigger piece for triggering the relay KA is connected in parallel to two ends of the resistor R and the capacitor C, and a terminal C is led out from a positive electrode end of the diode.

The normally open contact of the relay KA is connected with one end of the experiment button K2.

The trigger part triggers the normally open contact of the relay KA to be closed through the pull-in voltage.

The terminal A and the terminal B are both trigger signal access ends, and the terminal C is an external power supply access end.

8 1N4007 diodes are connected in series in a loop in the rectifier bridge circuit.

Three live wires L1, L2 and L3 are connected with a protection switch K1.

The test circuit is also connected with a current-limiting resistor in series.

3. And the transformation of new and old equipment is facilitated.

4. Higher economic value can be created.

Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and the changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also belong to the protection scope of the present invention.

Claims

1. A leakage protector with a trigger breaking function comprises a zero sequence current transformer, a comparison operational amplifier and an experiment button K2 which are connected by a circuit, and is characterized in that the zero sequence current transformer and the comparison operational amplifier are connected by a rectifier bridge circuit, a primary coil of the zero sequence current transformer extends out of three live wires L1, L2 and L3 and a zero wire N, the zero wire N and the live wire L3 are connected by the experiment circuit and the experiment button K2, two ends of the experiment button K2 are connected with a relay KA in parallel, a terminal A is led out from one end of the experiment button K2, a terminal B is led out from one end of the relay KA, an RC integrating circuit is connected with the rectifier bridge circuit and comprises a diode, a resistor R and a capacitor C which are connected in series, two ends of the resistor R and the capacitor C are connected in parallel and are used for triggering a trigger piece of the relay KA, and a terminal C is led out from the positive end of the diode.

2. A earth-leakage protector with trigger breaking function as claimed in claim 1, wherein the normally open contact of said relay KA is connected with one end of said experiment button K2.

3. A earth-leakage protector with trigger breaking function according to claim 2, characterized in that said trigger piece triggers the normally open contact of said relay KA to close by a pull-in voltage.

4. A earth-leakage protector with trigger breaking function as claimed in claim 1, wherein said terminal a and terminal B are both trigger signal input terminals, and said terminal C is an external power supply input terminal.

5. A leakage protector with trigger breaking function as claimed in claim 1, wherein 8 diodes 1N4007 are connected in series in a loop in the rectifier bridge circuit.

6. A leakage protector with a trigger breaking function as claimed in claim 1, wherein a protection switch K1 is connected to the three live wires L1, L2 and L3.

7. A leakage protector with a trigger breaking function as claimed in claim 1, wherein the test circuit is further connected in series with a current limiting resistor.