Three-Terminal Power Line Fault Location Correction

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Solution Overview

Problem

Conventional power line fault location methods using digital protection relays often result in inaccurate fault location, leading to delayed repairs and extended power restoration times.

Innovation Solution

A three-terminal power line fault location and correction system that uses three terminal devices connected to a divergence point of the power line, along with an electronic device for correcting fault distances through a simplified calculation method.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If digital protection relays are used for fault location calculation, then fault location data can be obtained, but the accuracy of fault location is poor

Engineering Contradiction:

Improvefault location accuracyVSAvoidpower restoration time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The power line is divided into multiple sections with terminal devices at different terminals (e.g., three-terminal system). Each terminal device independently calculates fault distance, and the results are segmented and compared to identify the accurate fault location, improving measurement precision through distributed measurement segments.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system uses feedback by comparing fault distance calculations from multiple terminal devices. The electronic device receives fault distance data from each terminal, compares these values, and uses the feedback from multiple measurements to determine the accurate fault location, thereby improving accuracy while enabling quick identification.

Inventive Principle:

Principle #23Feedback

2Measurement precision

If test transmission method is used to determine fault region, then fault location can be identified, but secondary fault damage occurs and fault range expands

Engineering Contradiction:

Improvefault location identificationVSAvoidsecondary fault damage

Core Design Contradiction:

Measurement precisionVSObject-generated harmful factors

Solution Approach 1:

The system performs preliminary fault location calculation using digital protection relays at each terminal device before any physical inspection or test transmission. By calculating the fault distance electronically and comparing results from multiple terminals, the system identifies the fault location in advance, eliminating the need for test transmission that could cause secondary damage.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces the mechanical/test transmission method with an electronic calculation and comparison system. Instead of physically transmitting test signals that may cause damage, the system uses electrical measurements and mathematical calculations at each terminal, then compares results electronically to locate the fault without physical intervention that could generate harmful effects.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Loss of time

If conventional fault location algorithms are used, then inspection area can be narrowed, but complex data calculation is required

Engineering Contradiction:

Improvefault inspection timeVSAvoiddata calculation complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The calculation task is segmented and distributed to multiple terminal devices located at different points on the power line. Each terminal device independently performs simple fault distance calculation using local measurements, rather than one device performing complex centralized calculations. This segmentation reduces individual device complexity while maintaining overall system effectiveness.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each terminal device autonomously performs fault distance calculation using its own local measurements and the standard fault location formula. The devices self-service by independently computing their respective fault distances without requiring complex centralized processing, then the electronic device simply compares these self-generated results to identify the fault location.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12265112B2Three-terminal power line fault location and correction system and method

Publication Date: 2025.04.01 TAIWAN POWER COMPANY

AI summary

A three-terminal power line fault location and correction system and method, and a computer readable storage medium. An electronic device is electrically connected with a plurality of terminal devices. When a fault occurs at a certain position of the power line, each terminal device detects the fault to generate a fault distance corresponding to the fault. The electronic device corrects the fault distance as follows: the corrected fault distance of one of the terminal devices=(an actual distance between the terminal device and a divergence point+a function of actual distances between the other two terminal devices and the divergence point)*the fault distance corresponding to the terminal device/(the fault distance corresponding to the terminal device+the fault distance corresponding to a function of the actual distances between the other two terminal devices and the divergence point).