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Voltage and current switchable type electric leakage protection device

A leakage protection device, voltage and current technology, applied in the direction of emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., can solve the problems of staying in the principle stage, poor anti-interference of the detection circuit, high input impedance, etc., to achieve Improve anti-interference, good anti-interference effect

Inactive Publication Date: 2015-04-29
YUYAO JIARONG ELECTRONICS & ELECTRIC APPLIANCE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing leakage protection technology mainly uses the neutral line (N) and the phase line (L) to pass through the zero-sequence transformer at the same time as a leakage protector, and the ground wire live detection (voltage detection and current detection), in the existing Since the transformer (voltage type) is used in the ground wire live detection and protection device, the principle of voltage type detection is based on the input power supply end: the transformer is connected in parallel between the ground wire (E) and the neutral wire (N) and a resistor is connected in series or Other available components, when introduced into practical application after realizing the principle, the insulation resistance between N-E is less than 10MΩ. Due to the high input impedance, the detection circuit has poor anti-interference, and the detection scheme cannot be effectively commercialized. Most of the designs only stay in the principle In order to solve the insulation resistance of the N-E terminal and improve the anti-interference ability, the following technical solutions are proposed

Method used

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  • Voltage and current switchable type electric leakage protection device
  • Voltage and current switchable type electric leakage protection device

Examples

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Embodiment 1

[0018] Such as figure 1 As shown in the schematic diagram of the circuit, the voltage and current switchable leakage protection device of the present invention includes a release L1, a rectifier diode D1, a thyristor SCR1, an indicator light circuit consisting of LED1 and a resistor R1, and a step-down circuit consisting of a resistor R2 Composition, first amplifying circuit IC1, zero-sequence current transformer ZCT1, test circuit consists of switch K1 and resistor R3, second amplifying circuit IC2 and over-temperature detection circuit (composed of voltage reference source U1, resistor R4, resistor R5, resistor R6 , triode Q1 and thermistor RT), the second amplifying circuit IC2 is also provided with a ground current transformer ZCT2 and a ground voltage detection circuit; the ground voltage detection circuit includes a first capacitor C4, a second capacitor C5, the third capacitor C6 and the adjusting resistor R7; one end of the first capacitor C4 is connected to the neutra...

Embodiment 2

[0033] The principles and beneficial effects of this embodiment and Embodiment 1 are basically the same, the difference lies in: figure 2 As shown, the ground wire voltage detection circuit is also provided with a fourth capacitor C7 and a diode D4, the first to fourth capacitors form a capacitor bridge, and the common end of the first capacitor C4 and the fourth capacitor C7 is connected to an adjustment resistor One end of R7, the common end of the second capacitor C2 and the third capacitor C3 are connected to the other end of the adjusting resistor R7 and the anode of the diode D4, and the cathode of the diode D4 is connected to the transfer switch K2. The live voltage of the local line is extracted by the coupling and rectification of C6 and D4, the signal is sent to the 2 pin of IC2 through the switch K2, and the signal is extracted by C4 and sent to the 1 pin of IC2, the resistor R7 is used to adjust the detection sensitivity of IC2, C5, C7 In order to adjust the balan...

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Abstract

The invention discloses a voltage and current switchable type electric leakage protection device. The voltage and current switchable type electric leakage protection device comprises a release, a rectifier diode, a silicon controlled rectifier, an indicator light circuit, a voltage reduction circuit, a first amplification circuit, a zero sequence current transformer, a test circuit, a second amplification circuit and an overtemperature detection circuit, wherein the second amplification circuit is further provided with a ground wire current transformer and a ground wire voltage detection circuit. The novel voltage and current switchable type electric leakage protection device can shut off power supply under the conditions that the load end is zero, a phase line has electric leakage and a power supply socket ground wire is charged.

Description

technical field [0001] The invention relates to the technical field of electricity safety protection, in particular to a voltage and current switchable leakage protection device. Background technique [0002] The existing leakage protection technology mainly uses the neutral line (N) and the phase line (L) to pass through the zero-sequence transformer at the same time as a leakage protector, and the ground wire live detection (voltage detection and current detection), in the existing Since the transformer (voltage type) is used in the ground wire live detection and protection device, the principle of voltage type detection is based on the input power supply end: the transformer is connected in parallel between the ground wire (E) and the neutral wire (N) and a resistor is connected in series or Other available components, when introduced into practical application after realizing the principle, the insulation resistance between N-E is less than 10MΩ. Due to the high input im...

Claims

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Application Information

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IPC IPC(8): H02H3/32
Inventor 钱加灿
Owner YUYAO JIARONG ELECTRONICS & ELECTRIC APPLIANCE CO LTD
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