CN212627125U

CN212627125U - Residual current circuit breaker with signal delay processing function

Info

Publication number: CN212627125U
Application number: CN202021910949.2U
Authority: CN
Inventors: 吴金龙; 刘洋; 周逢彪; 杨林; 方正
Original assignee: Yueqing Jinlong Electronic Industrial Co ltd
Current assignee: Yueqing Jinlong Electronic Industrial Co ltd
Priority date: 2020-09-04
Filing date: 2020-09-04
Publication date: 2021-02-26
Anticipated expiration: 2030-09-04

Abstract

The utility model relates to a residual current circuit breaker with signal time delay processing function, external AC power supply is connected to rectifier circuit's input, and release coil connection is between rectifier circuit and external AC power supply, and ground connection leakage detector U1's power input end is connected to rectifier circuit's output, and external AC power supply's live wire L and zero line N wear to put on zero sequence transformer, and voltage detection circuit's input is connected to zero sequence transformer's output, and ground connection leakage detector U1's input is connected to voltage detection circuit's output, RC time delay circuit is connected with ground connection leakage detector U1, trigger the output that switch on circuit connects ground connection leakage detector U1 respectively and the one end of release coil. This practical residual current circuit breaker is difficult for taking place the malfunction accident under the interference of outside high-frequency pulse voltage or high-frequency pulse current, can improve the reliability of residual current circuit breaker work.

Description

Residual current circuit breaker with signal delay processing function

Technical Field

The utility model relates to a residual current circuit breaker especially relates to a residual current circuit breaker with signal delay processing function.

Background

A residual current circuit breaker is a switch that can automatically operate when the value of the residual current in the circuit exceeds a predetermined value. The residual current circuit breaker mainly comprises a zero sequence current transformer, a voltage detection circuit, a power semiconductor switch and a release. The zero sequence current transformer monitors residual current in a protected circuit in real time, converts the residual current into an induced voltage signal and outputs the induced voltage signal to the voltage detection circuit, and when the amplitude of the output induced voltage signal exceeds the threshold voltage of the voltage detection circuit, the power semiconductor switch receives the signal and is switched on, the trip coil is electrified, the trip contact acts, and the protected circuit is switched off. The existing power semiconductor switch of the residual current circuit breaker is often interfered by external high-frequency pulse current and high-frequency pulse voltage signals, and false operation occurs when the residual current value is not equal to a preset value. The malfunction of the residual current circuit breaker can cause the normal power supply circuit to be powered off, thereby not only reducing the reliability of power supply, but also causing certain economic loss.

Disclosure of Invention

In view of this, the utility model aims at providing a residual current circuit breaker with signal delay processing function is difficult for taking place the malfunction accident under the interference of outside high frequency pulse voltage or high frequency pulse current, improves the reliability of residual current circuit breaker work.

In order to achieve the above object, the present invention adopts such an aftercurrent circuit breaker with signal delay processing function, which comprises a zero sequence transformer, a voltage detection circuit, an RC delay circuit, a trigger conduction circuit, a grounding leakage detector U1, a release coil, and a rectification circuit, wherein an input end of the rectification circuit is connected to an external ac power source, the release coil is connected between the rectification circuit and the external ac power source, an output end of the rectification circuit is connected to a power input end of the grounding leakage detector U1, a live wire L and a zero wire N of the external ac power source are inserted into the zero sequence transformer, an output end of the zero sequence transformer is connected to an input end of the voltage detection circuit, an output end of the voltage detection circuit is connected to an input end of the grounding leakage detector U1, the RC delay circuit is connected to the grounding leakage detector U1, and the trigger conduction circuit is respectively connected to an output end of the grounding leakage, the RC time delay circuit comprises a diode D4, a capacitor C9 and a resistor R8, wherein the anode of the diode D4 is connected with the fourth pin of the grounding leakage detector U1, the cathode of the diode D4 is respectively connected with one end of the capacitor C9 and one end of the resistor R8, and the other end of the capacitor C9 and the other end of the resistor R8 are both grounded.

The operating principle of the residual current circuit breaker with the signal delay processing function is as follows: when the zero sequence transformer detects that the residual current or the residual current does not exceed the preset value, the grounding leakage detector U1 does not enable the trigger conducting circuit to work, namely, the coil of the tripper is not electrified; when the residual current exceeds a preset value, the grounding leakage detector U1 enables the trigger conduction circuit to work, the trigger conduction circuit and the tripper coil form a series branch, the tripper coil is electrified, and the tripper action is completed with breaking. On the basis, by arranging an RC delay circuit consisting of a diode D4, a capacitor C9 and a resistor R8, when the residual current in the protected circuit does not exceed a preset value and the trigger conduction circuit is interfered by external 1.2/50us high-frequency pulse voltage or 8/20us high-frequency pulse current signals, the RC delay circuit selects the frequency range of the currently input high-frequency spike pulse signals, compares the currently input high-frequency spike pulse signals with the trigger conduction circuit to process the signals, and filters abnormal high-frequency interference signals, so that misoperation is avoided. The utility model discloses residual current circuit breaker with signal delay processing function can reduce outside high frequency pulse voltage or high frequency pulse current to the interference of residual current circuit breaker action effectively, avoids the residual current not to exceed the predetermined value and takes place the malfunction, improves the reliability of residual current circuit breaker work.

The utility model discloses further set up to still including surge suppression circuit, surge suppression circuit connects between rectifier circuit and outside alternating current power supply.

The utility model discloses it includes piezo-resistor R5 and piezo-resistor R9 to set up to surge suppression circuit further, the one end of release coil is connected to piezo-resistor R9's one end, and the other end of release coil is connected to piezo-resistor R5's one end, zero line N is all connected to piezo-resistor R5's the other end and piezo-resistor R9's the other end.

The surge suppression circuit protects the follow-up circuit from being influenced by external voltage fluctuation, protects the electronic device from being damaged, and prolongs the service life of the product.

The utility model discloses it includes diode D3 and thyristor Q1 to set up to trigger the circuit that switches on, the one end of release coil is connected to diode D3's positive pole, and thyristor Q1's positive pole is connected to diode D3's negative pole, and thyristor Q1's negative pole ground connection, the seventh pin of ground connection earth leakage detector U1 is connected to thyristor Q1's grid.

The trigger conducting circuit adopts a thyristor as a control element, and a seventh pin of the grounding leakage detector U1 outputs a control signal to a gate of the thyristor, so that the working state of the trigger conducting circuit is controlled.

This practicality is further set up to rectifier circuit and is bridge rectifier circuit.

This practicality further sets up to ground connection earth leakage detector U1's model be KA 2803B.

The ground leakage detector U1 with the model number of KA2803B has the characteristics of low power consumption and high noise resistance, and the number of required peripheral components is small.

Drawings

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

Detailed Description

As shown in fig. 1, the utility model relates to a residual current circuit breaker with signal delay processing function, which comprises a zero sequence transformer (1), a voltage detection circuit (2), an RC delay circuit (3), a trigger conduction circuit (4), a ground leakage detector U1(5), a release coil (6), a rectification circuit (7) and a surge suppression circuit (8), wherein the model of the ground leakage detector U1(5) is KA2803B, the rectification circuit (7) is a bridge rectification circuit, the input end of the rectification circuit (7) is connected with an external ac power supply, the release coil (6) is connected between the rectification circuit (7) and the external ac power supply, the output end of the rectification circuit (7) is connected with the power input end (a third pin and an eighth pin) of the ground leakage detector U1(5), and a live wire L and a zero wire N of the external ac power supply are inserted on the zero sequence transformer (1), the output end of the zero sequence transformer (1) is connected with the input end of a voltage detection circuit (2), the output end of the voltage detection circuit (2) is connected with the input end (a first pin and a second pin) of a grounding leakage detector U1(5), an RC delay circuit (3) is connected with the grounding leakage detector U1(5), a trigger conduction circuit (4) is respectively connected with the output end of the grounding leakage detector U1(5) and one end of a tripper coil (6), a surge suppression circuit (8) is connected between a rectification circuit (7) and an external alternating current power supply, the RC delay circuit (3) comprises a diode D4, a capacitor C9 and a resistor R8, the anode of the diode D4 is connected with the fourth pin of the grounding leakage detector U1(5), the cathode of the diode D4 is respectively connected with one end of a capacitor C9 and one end of a resistor R8, the other end of the capacitor C9 and the other end of the resistor R8 are grounded, the trigger conduction circuit (4) comprises a diode D3 and a thyristor Q1, the positive electrode of the diode D3 is connected with one end of a tripper coil (6), the negative electrode of the diode D3 is connected with the anode of a thyristor Q1, the cathode of the thyristor Q1 is grounded, the grid of the thyristor Q1 is connected with the seventh pin of a grounding leakage detector U1(5), the surge suppression circuit (8) comprises a piezoresistor R5 and a piezoresistor R9, one end of the piezoresistor R9 is connected with one end of the tripper coil (6), one end of the piezoresistor R5 is connected with the other end of the tripper coil (6), and the other end of the piezoresistor R5 and the other end of the piezoresistor R9 are both connected with a zero line N.

According to the above embodiment, the utility model discloses residual current circuit breaker's theory of operation with signal delay processing function does: when the zero sequence transformer detects that the residual current or the residual current does not exceed the preset value, the grounding leakage detector U1 does not enable the trigger conducting circuit to work, namely, the coil of the tripper is not electrified; when the residual current exceeds the preset value, the grounding leakage detector U1 can trigger the conducting circuit to work, so that the coil of the tripper is electrified, and the tripper acts to complete the breaking. On the basis, an RC delay circuit consisting of a diode D4, a capacitor C9 and a resistor R8 is arranged, when the residual current in the protected circuit does not exceed the preset value and the triggering and conducting circuit is interfered by external 1.2/50us high-frequency pulse voltage or 8/20us high-frequency pulse current signal, the RC time delay circuit selects the frequency range of the currently input high-frequency sharp pulse signal and compares the signal with the triggering and conducting circuit, abnormal high-frequency interference signals are filtered, thereby avoiding the occurrence of false operation, the magnitude of external pulse high-frequency voltage or current signals influences the value ranges of R8 and C9, if the value range of C9 is too large, the conduction time of a trigger release triggering a conduction circuit is influenced, therefore, the value ranges of R8 and C9 must be reasonable, and the parameters must be determined according to actual conditions.

Claims

1. The utility model provides a residual current circuit breaker with signal delay processing function which characterized in that: the circuit comprises a zero sequence transformer, a voltage detection circuit, an RC delay circuit, a trigger conduction circuit, a grounding leakage detector U1, a tripper coil and a rectification circuit, wherein the input end of the rectification circuit is connected with an external alternating current power supply, the tripper coil is connected between the rectification circuit and the external alternating current power supply, the output end of the rectification circuit is connected with the power input end of the grounding leakage detector U1, a live wire L and a zero wire N of the external alternating current power supply are penetrated on the zero sequence transformer, the output end of the zero sequence transformer is connected with the input end of the voltage detection circuit, the output end of the voltage detection circuit is connected with the input end of the grounding leakage detector U1, the RC delay circuit is connected with the grounding leakage detector U1, the trigger conduction circuit is respectively connected with the output end of the grounding leakage detector U1 and one end of the tripper coil, and the RC delay circuit, the anode of the diode D4 is connected to the fourth pin of the ground leakage detector U1, the cathode of the diode D4 is connected to one end of the capacitor C9 and one end of the resistor R8, respectively, and the other end of the capacitor C9 and the other end of the resistor R8 are both grounded.

2. The residual current circuit breaker with signal delay processing function according to claim 1, characterized in that: the surge suppression circuit is connected between the rectifying circuit and an external alternating current power supply.

3. The residual current circuit breaker with signal delay processing function according to claim 1 or 2, characterized in that: the trigger conducting circuit comprises a diode D3 and a thyristor Q1, the positive electrode of the diode D3 is connected with one end of a release coil, the negative electrode of the diode D3 is connected with the anode of a thyristor Q1, the cathode of the thyristor Q1 is grounded, and the gate of the thyristor Q1 is connected with the seventh pin of the grounded leakage detector U1.

4. The residual current circuit breaker with signal delay processing function of claim 2, characterized in that: the surge suppression circuit comprises a piezoresistor R5 and a piezoresistor R9, one end of a tripper coil is connected with one end of the piezoresistor R9, the other end of the tripper coil is connected with one end of the piezoresistor R5, and the other end of the piezoresistor R5 and the other end of the piezoresistor R9 are both connected with a zero line N.

5. The residual current circuit breaker with signal delay processing function according to claim 1 or 2, characterized in that: the rectification circuit is a bridge rectification circuit.

6. The residual current circuit breaker with signal delay processing function according to claim 1 or 2, characterized in that: the model of the grounding leakage detector U1 is KA 2803B.