A nuclear safety level uninterruptible power supply system and a bypass voltage monitoring and alarming circuit thereof

Abstract

The invention discloses a bypass voltage monitoring and alarming circuit of a nuclear safety level uninterruptible power supply system, which is arranged on the bypass of the uninterruptible power supply system. The circuit comprises a voltage relay, two input terminals of which are respectively connected to a positive electrode power supply line and a negative electrode voltage line of the bypass, and outputs a control signal when the bypass voltage is over-voltage or under-voltage. An inverter switching unit connected to an output terminal of the voltage relay, configured to perform latch-upswitching on the inverter of the uninterruptible power supply system when the control signal is received; a first alarm connected to an output terminal of the voltage relay; a second alarm is connected to the output of the voltage relay through a delay relay. The invention also discloses a corresponding nuclear safety level uninterruptible power supply system. The invention has the advantages ofeasy implementation, high safety and the like.

Description

technical field [0001] The invention relates to the field of nuclear safety uninterruptible power supply systems, in particular to a nuclear safety uninterruptible power supply system and a bypass voltage monitoring and alarm circuit thereof. Background technique [0002] Due to the importance of safe operation of nuclear power plants, an uninterrupted, highly reliable, and high-performance power supply is required for important instruments, important valves, and control loads. Therefore, the importance of AC UPS systems in nuclear power plants is self-evident. The nuclear safety uninterruptible power supply system is mainly powered by two independent power supplies, the inverter and the transformer, and the transformer is the backup power supply of the inverter. Such as figure 1 Shown is a structural schematic diagram of an existing uninterruptible power supply system. Under normal circumstances, the 220V AC bus is powered by the inverter. When the conditions of the outp...

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Problems solved by technology

[0003] As an important part of the uninterruptible power supply, the normal operation of the bypass circuit is also very important. It is necessary to monitor the voltage of the bypass, but there is no good bypass monitoring and alarm circuit in the existing technology. In the technology, when the bypass voltage exceeds the limit, the system can block the inverter to switch to the automatic bypass in time, but because the abnormal bypass voltage alarm cannot be sent to the main control, the operating personnel cannot be informed of this signal at the first time, and cannot intervene in time to deal with the fault

At the same time, there is also the risk that the operator manually switches to the bypass in the case of a bypass failure, causing the entire panel to lose power, and the downstream important loads will lose the risk of power supply

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