DCS Control Module for Nuclear Transformer Switchgear
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Solution Overview
Problem
The existing control systems for 6.6 kV switchgear in nuclear power plants are complex, unreliable, difficult to maintain, and costly due to the need for many operators, which affects the safe operation of both the 6.6 kV and 380V auxiliary power systems.
Innovation Solution
A DCS control module for transformers in nuclear power plants, comprising input command processing, malfunction processing, state processing, and output command generating logic units, integrated with a 6.6 kV switchgear and man-machine interfaces, to enhance reliability and automation, reducing the number of maintenance operators required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay control devices including intermediate relays, protective current relays, voltage relays, and switching-through intermediate relays are used to control the 6.6 kV switchgear, then the control function is achieved, but the system becomes complicated in connection, low in reliability, difficult in maintenance, and low in efficiency
Solution Approach 1:
The patent merges multiple relay control functions into a single integrated DCS control module that consolidates command processing, malfunction processing, state processing, and output command generation. This integration eliminates the need for separate intermediate relays, protective current relays, voltage relays, and switching-through intermediate relays, thereby reducing connection complexity while maintaining control reliability through centralized logic processing.
Solution Approach 2:
The patent replaces the mechanical relay-based control system with an electronic DCS control module that uses digital logic circuits and microprocessors. This substitution eliminates mechanical wear and connection points inherent in relay systems, significantly improving reliability while reducing maintenance requirements and operational complexity.
2Ease of operation
If multiple relay control devices and extensive cabling are used in the control room, then the control function is achieved, but the maintenance cost increases and many operators are needed
Solution Approach 1:
The patent combines multiple control functions and monitoring capabilities into a single DCS control module interface, allowing one operator to manage what previously required multiple operators. The integrated module consolidates command issuance, status monitoring, malfunction detection, and interlock control into unified software interfaces, reducing the need for multiple operators while improving ease of operation.
3Productivity
If relay control devices with extensive connections are used, then the control function is achieved, but the system is low in efficiency and difficult in maintenance
Solution Approach 1:
The patent replaces the mechanical relay system with an electronic DCS control module that uses integrated circuits and software logic. This substitution eliminates the need for physical wiring connections between multiple relay devices, making the system more efficient and significantly easier to maintain. Fault diagnosis and repair are simplified through digital error codes and centralized monitoring capabilities.
Data Source
AI summary
A distribution control system (DCS) control module for a transformer in nuclear power engineering, includes: an input command processing logic unit (1), a malfunction processing logic unit (2), a state processing logic unit (3), an output command generating logic unit (4) and a 6.6 kV switchgear of the transformer. The DCS control module utilizes the DCS integral with the power units to realize the control of 6.6 kV transformer switch, the sharing of the operator station with the power unit control system, and the overall monitoring, and the operation reliability of the power units is improved.