Nuclear power plant DC power system transmission system

Abstract

The invention relates to a transmission system of a nuclear power plant direct-current power system. The transmission system comprises a first signal circuit set and a second signal circuit set of the nuclear power plant direct-current power system, a first nuclear safety load circuit set, a first non-nuclear safety load circuit set, a second nuclear safety load circuit set, a second non-nuclear safety load circuit set, a first signal transmitter, a second signal transmitter, a first signal isolator, a second signal isolator, a field instrument and a working power supply signal circuit set. With the system, electric signal isolation can be implemented on field instrument equipment or channels prone to insulation deterioration with other equipment or electric circuits in good condition effectively to have insulation fault coverage effectively isolated and prevent the insulation condition from transmitting in the whole channel circuit.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant direct current power supply systems, in particular to a nuclear power plant direct current power supply system transmission system. Background technique [0002] The crude oil level indicator L9SKH700ID of the main oil tank of the L9SKH lubricating oil and grease storage system of a nuclear power plant phase I has two signals from the No. 1 unit and the No. Both are 4 ~ 20mA DC current signal. Because the L9SKH700ID of the first phase of a certain nuclear power plant is located in room MO202 of the conventional island, there is no air-conditioning facility in this room, so the air humidity in the room is high during the rainy season, and it is not easy for the L9SKH700ID itself and related sensor circuits to be completely sealed, and it is easy to be affected by wet weather and cause the entire signal The insulation drop of the circuit-related lines is abnormal. One consequence is tha...

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Problems solved by technology

However, the weather conditions in the rainy season, as the normal design operating conditions of the various systems of the nuclear power plant, occasionally and randomly cause the insulation drop or failure of the relevant DC power supply, which reduces the operational reliability of the system and seriously interferes with the judgment of the main control operator of the nuclear power plant. To the normal operation of the system of the nuclear power plant, such as the operation control of the system under normal or accident conditions, the continuous monitoring of the status signals of the unit under various working conditions, etc., resulting in a decrease in the operating safety of the system or unit

At the same time, it is necessary to find out the cause of the low insulation alarm or failure, which will cause a large amount of additional operation and maintenance work that needs to be completed in a short time to complete the fault finding work, and even the system state switching operation and state tracking due to the fault finding. To the reliability and safety of the unit system or equipment operation, increase the maintenance workload and cost

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