Voltage and current switchable type electric leakage protection device

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...

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