Electric leakage protection device

Abstract

The invention discloses an electric leakage protection device which comprises a controller and a current detection device connected with a bus positive electrode and a bus negative electrode, the current detection device can detect current flowing through the bus positive electrode and the bus negative electrode, and then the controller judges whether electric leakage exists on the load side of the electric leakage protection device or not according to current changes. Corresponding processing is carried out during electric leakage, so that protection of the power supply equipment is realized. Meanwhile, the detection device only detects the current and is not connected to an original closed loop, so that the voltage of the bus positive electrode and the bus negative electrode does not drift, and the electric leakage condition of the bus positive electrode or the bus negative electrode can be judged under the condition that the requirement of a power supply system is not influenced.

Description

technical field [0001] The present application relates to the technical field of leakage protection, in particular to a leakage protection device. Background technique [0002] Leakage protection devices are used to protect power supply equipment and personnel. The power supply system of the existing monorail DC power supply system is generally to add a leakage protection resistor R0 and a unidirectional conductive silicon stack D1 between the negative pole and the ground as a leakage protection device for leakage protection. When the power supply system is 0, DC1500V, when the positive pole leaks to the ground, the current returns from the ground to the negative pole through the leakage protection resistor R0 and the silicon stack D1, thereby triggering an alarm or trip signal to protect the power supply system. When the power supply system is ±DC375V or ±DC750V, such as figure 1 As shown, since the voltage applied to the leakage protection resistor R0 is 375V, a large cu...

AI Technical Summary

Problems solved by technology

When the power supply system is ±DC375V or ±DC750V, such as figure 1 As shown, since the voltage applied to the leakage protection resistor R0 is 375V, a large current will flow through the leakage protection resistor R0 and the silicon stack D1, causing the trip signal to be triggered. The parallel connection of the protection resistor R0 and the second resistor R2 causes the voltage division across the second resistor R2 to decrease, and the negative electrode voltage drifts, which cannot meet the requirements of the power supply system

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