Zero wire and ground wire danger early warning circuit breaker

Abstract

The invention discloses and provides a zero wire and ground wire danger early warning circuit breaker which operates in a power supply system and is connected between a zero wire and a ground wire of the power supply system. The zero line and ground wire danger early warning circuit breaker comprises a transformer, a half-wave rectifier, a resistor, a bridge rectifier, a bidirectional silicon controlled rectifier, a diode, a diode, a voltage-regulator tube, an electric reactor, an optical coupling element, a processor and an audible and visual alarm, wherein a detection unit is arranged in the processor and used for respectively controlling audible and visual alarm or tripping outage after sampling and analyzing the optical coupling element. According to the power supply system, if the insulation resistance between the null line and the ground wire is smaller than an initial value, a fault occurs, various dangerous faults can cause the reduction of the insulation resistance between the null line and the ground wire, sound-light alarm is started when the current passes 1mA, the alarm can be removed when the fault is removed during the alarm period, and a circuit breaker trip coil is driven to be powered off and tripped when the fault is removed overtime or the current exceeds 5mA. The circuit breaker is applied to the technical field of zero line and ground line danger early warning circuit breakers of IT power supply systems.

Description

technical field [0001] The invention relates to a circuit breaker, in particular to a neutral and ground danger warning circuit breaker suitable for an IT power supply system. Background technique [0002] People's first requirement for the power grid power supply system is safety, and the measures to ensure safety are first to prevent leakage, electric shock and electrical accidents. Over the years, people have made a lot of efforts for this, and the current power grid power supply system has indeed been greatly improved. However, there is no best but better. Today, with the continuous advancement of science and technology, the improvement, improvement, sound guarantee, and optimization of the power grid power supply system are still making continuous progress. [0003] Since it is not recommended to lead out the neutral wire in the IT power supply system, that is, the neutral wire is not connected to the ground wire, or the neutral wire is connected to the ground wire thro...

AI Technical Summary

Problems solved by technology

[0002] People's first requirement for the power grid power supply system is safety, and the measures to ensure safety are first to prevent leakage, electric shock and electrical accidents. Over the years, people have made a lot of efforts for this, and the current power grid power supply system has indeed been greatly improved. However, there is no best but better. Today, with the continuous advancement of science and technology, the improvement, improvement, sound guarantee, and optimization of the power grid power supply system are still making continuous progress.

[0003] Since it is not recommended to lead out the neutral wire in the IT power supply system, that is, the neutral wire is not connected to the ground wire, or the neutral wire is connected to the ground wire through high impedance, so once the neutral wire and the ground wire are short-circuited, the IT power supply system will lose its high impedance. With the advantage of grounding, the system will change from IT system to TN-S system; and because the IT power supply system does not implement the installation of leakage switches, it will become an unprotected TN-S system, which is very dangerous

At present, there is no research and development of short-circuit detection devices for neutral-to-ground wires in the industry, so the short-circuit detection of neutral-to-ground wires is very lacking.

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