Interphase Short-Circuit Clearing by Cyclic Grounding Pulses
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Solution Overview
Problem
Existing methods for processing interphase short circuits in three-phase non-effective grounding power supply systems are inefficient, taking a long time to clear faults and often causing damage due to prolonged exposure to short-circuit currents.
Innovation Solution
A method involving controlled switches that detect current pulses and cut off circuits based on the number of pulses, allowing for artificial grounding and cyclic connection/disconnection of phases to generate current pulses, which are used to quickly and automatically clear interphase short circuit faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reclosing method is adopted to clear interphase short circuit, then the fault can be eliminated for instantaneous short circuits, but the processing time is extended and manual intervention is required
Solution Approach 1:
The system automatically detects interphase short circuits and executes clearing operations without manual intervention. The control device autonomously identifies fault locations and coordinates circuit breaker operations, transforming the manual reclosing process into an automated self-service system that reduces processing time while maintaining reliability.
Solution Approach 2:
The patent replaces manual mechanical operations with automated electronic control systems. The control device uses electronic signals to trigger circuit breakers and coordinate clearing operations, substituting the mechanical reclosing process with an electronically controlled automated system that operates faster and more precisely.
2Reliability
If stage difference coordination method is adopted to isolate fault area, then the fault can be isolated, but the power supply system withstands short-circuit current for a long time causing great impact
Solution Approach 1:
The control device performs preliminary detection and identification of interphase short circuit faults before executing clearing operations. By pre-identifying the fault location and coordinating the timing of circuit breaker operations, the system minimizes the duration of short-circuit current flow while ensuring proper fault isolation, thereby reducing the harmful impact on the power supply system.
Solution Approach 2:
The system continuously monitors current signals and provides feedback to the control device. When an interphase short circuit is detected, the feedback mechanism triggers immediate coordination of circuit breaker operations to clear the fault, creating a closed-loop control system that responds dynamically to fault conditions and minimizes short-circuit current exposure time.
3Reliability
If multiple circuit breakers are arranged on a circuit to clear faults sequentially, then the fault can be cleared, but the circuit is subjected to large short-circuit current impact for extended periods
Solution Approach 1:
The patent replaces the traditional sequential mechanical operation of multiple circuit breakers with a coordinated electronic control system. The control device uses electronic signaling to synchronize the operation of multiple circuit breakers, enabling them to clear faults simultaneously or in optimized sequences that minimize the duration of short-circuit current flow through the power supply system.
Solution Approach 2:
The system changes the operational parameters of circuit breakers by coordinating their tripping times and sequences through electronic control. Instead of fixed sequential operation, the control device dynamically adjusts the timing parameters of each circuit breaker based on fault location and system conditions, optimizing the clearing process to reduce the duration of harmful current flow while maintaining reliable fault isolation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enables rapid and accurate identification and clearing of interphase short circuit faults, reducing the risk of damage from prolonged short-circuit currents and improving the overall safety and efficiency of power supply systems.
Implementation Method 1
enabling a charged phase or a neutral point of the three-phase non-effective grounding power supply system other than the fault phase to be cyclically connected to and disconnected from the ground, to form a closed loop together with the fault phase and generate a current pulse
Data Source
AI summary
A method for processing an interphase short circuit of a three-phase non-effective grounding power supply system, includes: when a two-phase or three-phase interphase short circuit occurs in a circuit, maintaining a fault phase of the circuit to be conducting and tripping off remaining fault phases, and enabling another fault phase connected to said fault phase to be artificially grounded or directly utilizing an existing grounding point; enabling a charged phase or a neutral point of the three-phase non-effective grounding power supply system other than said fault phase to be cyclically connected to and disconnected from the ground, to form a closed loop together with said fault phase and generate a current pulse, and detecting the current pulse by a controlled switch. When a certain controlled switch reaches a trigger condition and cuts off a circuit, a fault is cleared.