Ship Power Distribution Fault Isolation Using Directional Relays
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Solution Overview
Problem
Power distribution systems in ships face challenges in quickly isolating fault positions to minimize damage and service interruptions during disturbances, as existing technologies struggle to accurately and rapidly block faults in a selective manner.
Innovation Solution
A protection system comprising three circuit breaker modules with relays that communicate to identify fault currents and trip circuit breakers based on magnitude and direction, allowing selective blocking of fault sections and minimizing damage by rapidly isolating faults in the power distribution system of a ship.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing protection technologies are used, then system protection is provided, but the fault isolation is not rapid or accurate enough to minimize damage and service interruptions
Solution Approach 1:
The power distribution system is divided into multiple sections with individual circuit breakers at different levels (generator level, switchboard level, and feeder level). Each circuit breaker can be independently controlled to isolate faults in specific segments, enabling rapid and accurate fault localization without affecting the entire system.
Solution Approach 2:
Relays are installed at each circuit breaker location to detect fault conditions and provide feedback signals. The relays communicate fault information and coordinate tripping actions, enabling intelligent decision-making for selective fault isolation based on real-time system status.
2Reliability
If circuit breakers are installed at multiple levels, then selective fault blocking is enabled, but the system complexity increases
Solution Approach 1:
The system is segmented into three functional modules: generator-level circuit breakers, switchboard-level circuit breakers, and feeder-level circuit breakers. Each module serves a specific protection function, and the segmentation enables coordinated operation to achieve selective fault isolation.
Solution Approach 2:
Each circuit breaker module is designed with multi-functionality, serving both as a protection device for its specific section and as a coordinated element in the overall system protection scheme. The relays provide universal fault detection and coordination capabilities across different system levels.
Data Source
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AI summary
A system for protecting a power distribution system of a ship, the system includes a second circuit breaker module and a third circuit breaker module. The relay of the second circuit breaker module and the relay of the third circuit breaker module have the same delay time. When a fault occurs in the feeder preset to be in charge of the third circuit breaker module, the relay of the third circuit breaker module is configured to trip the circuit breaker based on a magnitude and a direction of a fault current, and to transmit a power distribution maintenance signal to the relay of the second circuit breaker module. When a fault occurs in the switchboard preset to be in charge of the second circuit breaker module, the relays of the second and third circuit breaker modules are configured to trip the circuit breaker based on a magnitude and a direction of a fault current and the relay of the second circuit breaker module is configured to transmit a power distribution maintenance signal to the relay of the third circuit breaker module preset based on the magnitude and direction of the fault current.