IT system capable of using electric leakage switch for low-voltage power supply and working method of IT system

Abstract

The invention discloses and provides an IT (information technology) system capable of using an electric leakage switch, which comprises a ground wire, a live wire and a null wire which are connected with a power supply end and are not connected with the ground wire, and a null wire and ground wire short circuit test and switching module, the zero line and ground wire short circuit detection and switching module comprises a control module, a power supply module, a zero line and ground wire voltage detection module and an on-off control module. When the detection voltage of the zero wire and ground wire short circuit detection and switching module is reduced by a certain value, the on-off control module carries out on-off intermittent repeated actions on the zero wire and the ground wire, so that the system is switched between an IT system and a TN system, whether the current circuit system really has an electric leakage condition or not is judged, and the action of each switch is matched to realize safe power supply and utilization guarantee. The method solves the problem that an electric leakage switch cannot be used due to small current of a zero wire and a ground wire of an IT system, and can be widely applied to safe power supply and distribution of a power grid.

Description

technical field [0001] The invention relates to a power supply system, in particular to an IT system and a working method thereof that can use a leakage switch for low-voltage power supply. Background technique [0002] The low-voltage power supply systems used today include TN systems and IT systems. [0003] TN system: [0004] Advantages: You can use a leakage switch and identify the leakage position; [0005] Disadvantages: Because the leakage current that can pass through the human body is: 220V / 3KΩ=73mA (the resistance of the human body is about 3kΩ), which is much larger than the human body can withstand, and is very dangerous. If the leakage switch fails, an electric shock accident will occur. [0006] IT system: [0007] Advantages: Because IT uses high-impedance grounding, the current through the human body is very small and very safe; [0008] Disadvantages: The leakage switch cannot be used. Currently, IMD insulation detectors are mainly used, but the leakage...

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Problems solved by technology

[0005] Disadvantage: Since the leakage current that can pass through the human body is: 220V / 3KΩ=73mA (the resistance value of the human body is about 3kΩ), it is far greater than the human body’s tolerance range, which is very dangerous. If the leakage switch fails, an electric shock accident will occur

[0008] Disadvantages: Leakage switch cannot be used. Existing IMD insulation detectors are mainly used but cannot identify the location of leakage. Although the safety is high, only small-scale power supply range can be used. If the neutral wire and the ground wire of the system are short-circuited, the live wire current passes through the human body, the ground wire flows back to the neutral wire, the current of the live wire and the neutral wire is still equal, and the leakage switch protection function fails

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