Protection Control Device Merging Fault Detection
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Solution Overview
Problem
Conventional protection and control systems for electric power systems require redundant hardware, leading to increased hardware and cost when multiple devices are connected to a process bus, as each device needs a Main and a Fault Detection unit, resulting in inefficiencies.
Innovation Solution
A protection and control system that includes multiple merging units and protection devices, where one device acts as a Fault Detection unit for others, reducing the need for redundant hardware by sharing relay characteristics and trip information to determine system faults and control circuit breakers efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each protection and control device is provided with a Main and a FD made of different hardware, then system reliability is improved, but hardware quantity and cost increase
Solution Approach 1:
The patent merges the FD function into the protection and control device itself, eliminating the need for separate FD hardware. The protection and control device performs both protection control and fault detection functions using shared hardware resources, thereby reducing hardware quantity while maintaining reliability through functional integration rather than physical redundancy
Solution Approach 2:
The protection and control device is designed with multi-functionality, serving both as a protection control device and as a fault detection device for other protection and control devices. This universal design allows a single hardware unit to perform multiple roles, reducing the overall hardware quantity needed in the system while maintaining the reliability benefits of having fault detection capabilities
2Adaptability or versatility
If multiple protection and control devices are connected to the process bus, then system coverage is improved, but hardware and cost increase due to redundancy requirements
Solution Approach 1:
Each protection and control device is designed with universal functionality to serve as both its own protection control device and as a fault detection device for other devices on the process bus. This multi-functional design allows the system to expand coverage by adding devices without proportionally increasing redundancy hardware, as each new device contributes both protection control capability and fault detection capability for the network
Solution Approach 2:
The patent combines the fault detection function within the protection and control device itself, allowing multiple devices to be connected to the process bus without each device requiring separate redundant FD hardware. This merging of functions enables scalable system expansion where hardware quantity increases only to provide additional coverage, not additional redundancy
Data Source
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AI summary
[Problem] Embodiments of the present invention make it an object to provide a protection and control system, a protection and control device, and a merging unit which can suppress the hardware amount in the protection and control system to which a process bus is applied. [Solving Means] A protection and control system in the embodiments of the present invention includes a merging unit which outputs electric variable information, a plurality of first protection and control devices each of which outputs main trip information based on the electric variable information and a predetermined relay characteristic, and a second protection and control device which outputs FD trip information based on the electric variable information and a plurality of the relay characteristics which are predetermined as respective fault detection relays of the first protection and control devices. In addition, the merging unit judges whether or not to open a circuit breaker or a switch which is installed in an electric power system based on the main trip information and the FD trip information.