Residual-current circuit breaker module

Abstract

The utility model relates to electrical equipment, in particular to a residual-current circuit breaker module. Comprising a power supply circuit, a zero-sequence current transformer, an overvoltage detection module, a driving circuit and a release, the zero-sequence current transformer sleeves an electric wire but is not electrically connected with a zero line or a live line, a signal output end of the zero-sequence current transformer is in signal connection with an adjustable resistor, the adjustable resistor is connected with a signal input end of the overvoltage detection circuit, and the overvoltage detection module is electrically connected with the driving circuit. The signal output end of the overvoltage detection circuit is connected with the drive circuit, the drive circuit is in signal connection with the release, the release is arranged on the electric wire and controls opening and closing of the zero line and the live line, and the live line input end and the zero line input end of the power supply circuit are in lap joint with the live line and the zero line respectively. The output end of the power supply circuit is connected with the power supply end of the overvoltage detection circuit; an adjustable resistor with an adjustable resistance value is arranged between the zero sequence current transformer and the overvoltage detection circuit, so that the sensitivity of the overvoltage detection circuit is adjustable.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrical equipment especially a residual-current circuit breaker module. BACKGROUND

[0002] It is known that the existing residual-current circuit breaker generally comprises a zero sequence current transformer, an overvoltage detection module, a driving circuit and a tripping device, the zero sequence current transformer is sleeved on the electric wire, when there is a leakage current, the zero sequence current transformer outputs a signal to the overvoltage detection module, the overvoltage detection module outputs a signal to the driving circuit, the driving circuit drives the tripping device to trip, thereby realizing the residual-current circuit breaking.

[0003] The existing technology has the following defects: the resistance values of the residual-current circuit breaker change due to friction, oxidation and other reasons after long-term use, some products become abnormally sensitive due to the decrease of the resistance value of the overvoltage detection module, and some products lose the detection function due to the increase of the resistance value of the overvoltage detection module. SUMMARY

[0004] In view of the defects of the prior art, the utility model provides a residual-current circuit breaker module.

[0005] The technical scheme of the utility model is as follows:

[0006] A residual-current circuit breaker module comprises a power supply circuit, a zero sequence current transformer, an overvoltage detection module, a driving circuit and a tripping device, the zero sequence current transformer is sleeved on the electric wire but is not electrically connected with the zero line or the live wire, the signal output end of the zero sequence current transformer is connected with an adjustable resistor, the adjustable resistor is connected with the signal input end of the overvoltage detection circuit, the signal output end of the overvoltage detection circuit is connected with the driving circuit, the driving circuit is connected with the tripping device, the tripping device is arranged on the electric wire and controls the opening and closing of the zero line and the live wire, the live wire input end and the zero line input end of the power supply circuit are respectively overlapped with the live wire and the zero line, and the output end of the power supply circuit is connected with the power supply end of the overvoltage detection circuit.

[0007] In one preferred embodiment of the present disclosure, the adjustable resistor is a potentiometer. The resistance value is changed by adjusting the position of the dial of the potentiometer.

[0008] In one preferred embodiment of the present disclosure, the adjustable resistor comprises a plurality of resistors and corresponding switches, all the resistors are connected in series, and each resistor is connected in parallel with a corresponding switch. The resistance value is changed by controlling the number of closed switches.

[0009] In one preferred embodiment of the present disclosure, the power supply circuit is a rectifier circuit, which converts the alternating current formed by the live wire and the zero line into a current that can be used by the overvoltage detection circuit.

[0010] In one preferred embodiment of the present disclosure, a test circuit is further arranged between the live wire and the zero wire, and the test circuit comprises a test circuit and a test switch, which is used to cause a short circuit artificially and test whether the overvoltage detection circuit can correctly perceive the electric leakage.

[0011] The present application has the advantages that

[0012] According to the present disclosure, the adjustable resistor with adjustable resistance is arranged between the zero sequence current transformer and the overvoltage detection circuit, so that the sensitivity of the overvoltage detection circuit is adjustable, and the service life of the electric leakage circuit breaker module can be prolonged by adjusting the resistance value of the adjustable resistor according to the over-sensitivity or over-dullness of the overvoltage detection circuit after long-term use. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 Fig. 1 is a structural schematic diagram of the present application;

[0014] Figure 2 Fig. 2 is a circuit diagram of the adjustable resistor of embodiment 1;

[0015] Figure 3 Fig. 3 is a circuit diagram of the adjustable resistor of embodiment 2. DETAILED DESCRIPTION

[0016] The specific implementation of the present application will be further described below in combination with the drawings: EMBODIMENT

[0017] As shown in Figs. Figure 1 and 2 An electric leakage circuit breaker module, comprising a power supply circuit, a zero sequence current transformer, an overvoltage detection module, a driving circuit and a tripping device, the zero sequence current transformer is sleeved on the electric wire but is not electrically connected with the zero wire or the live wire, the signal output end of the zero sequence current transformer is signal connected with an adjustable resistor, the adjustable resistor is connected with the signal input end of the overvoltage detection circuit, the signal output end of the overvoltage detection circuit is connected with the driving circuit, the signal of the driving circuit is connected with the tripping device, the tripping device is arranged on the electric wire and controls the opening and closing of the zero wire and the live wire, the live wire input end and the zero wire input end of the power supply circuit are respectively overlapped with the live wire and the zero wire, and the output end of the power supply circuit is connected with the power supply end of the overvoltage detection circuit. The adjustable resistor is a potentiometer. EMBODIMENT

[0018] The adjustable resistor of the present embodiment comprises R1 resistor, R2 resistor and R3 resistor, the R1 resistor, the R2 resistor and the R3 resistor are connected in series, and the R1 resistor, the R2 resistor and the R3 resistor are respectively connected in parallel with S1 switch, S2 switch and S3 switch. Obviously, when all the switches are opened, the resistance value of the adjustable resistor is the largest, and the more the closed switches are, the smaller the resistance value is. The remaining structure is the same as that of embodiment 1. EMBODIMENT

[0019] The power supply circuit is a rectifier circuit, which converts the alternating current formed by the live wire and the zero line into a current that can be used by the overvoltage detection circuit.

[0020] The rest of the structure is the same as that of Embodiment 1. Embodiment

[0021] The test circuit further includes a test switch, which is used to artificially cause a short circuit and test whether the overvoltage detection circuit can correctly perceive the leakage.

[0022] The rest of the structure is the same as that of Embodiment 1.

[0023] Although the modules according to the embodiments of the present disclosure have been described above, aspects of the present disclosure are not limited to the above-described embodiments, and the present disclosure can be implemented in various ways within the scope of the spirit of the present disclosure.

Claims

1. An electrical leakage circuit interrupter module, comprising: The utility model provides an overvoltage protection device for electric wire, including power supply circuit, zero sequence current transformer, overvoltage detection module, drive circuit and tripping device, the zero sequence current transformer is set in the electric wire outside but is not electrically connected with zero line or live wire, the signal output end signal connection adjustable resistor of zero sequence current transformer, adjustable resistor connects overvoltage detection circuit signal input end, overvoltage detection circuit signal output end connects drive circuit, drive circuit signal connects tripping device, and tripping device is arranged on electric wire and controls the opening and closing of zero line and live wire, the live wire input end and zero line input end of power supply circuit are overlapped with live wire and zero line respectively, and the output end of power supply circuit connects overvoltage detection circuit power end.

2. The ground fault circuit interrupter module of claim 1, wherein: The adjustable resistor is a potentiometer.

3. The ground fault circuit interrupter module of claim 1, wherein: The adjustable resistor includes a plurality of resistors and corresponding switches, all of the resistors are connected in series, and each resistor is connected in parallel with a corresponding switch.

4. The ground fault circuit interrupter module of any of claims 1-3, wherein: The power supply circuit is a rectifier circuit.

5. The ground fault circuit interrupter module of any of claims 1-3, wherein: A test circuit is further arranged between the live wire and the zero line, and the test circuit includes a test circuit and a test switch.

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