Fault Location Method Using Current Measurements and Shunt Capacitance Compensation
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Solution Overview
Problem
Existing fault location techniques in electric power delivery systems face inaccuracies due to the lack of voltage measurements, particularly when accounting for shunt capacitances, leading to errors in determining the precise location of faults on power lines, which can result in prolonged downtime and reduced system reliability.
Innovation Solution
The implementation of a method using a pi equivalent model and hyperbolic equations to compensate for shunt capacitances, allowing for accurate fault location determination based on current measurements alone, by calculating the compensated differential current and fault voltage, thereby improving the accuracy of fault location without requiring voltage measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing fault location techniques are used without voltage measurements, then device complexity is reduced, but measurement precision deteriorates due to inability to account for shunt capacitances
Solution Approach 1:
The patent transforms the fault location calculation from traditional voltage-based methods to current-based methods by changing the fundamental measurement parameter. This is achieved through developing equivalent circuit models and calculation algorithms that use only current measurements from local and remote relays, eliminating the need for voltage measurements while maintaining accuracy by properly accounting for shunt capacitance effects through the derived mathematical relationships.
2Device complexity
If shunt capacitances are not accounted for in fault location calculations, then calculation complexity is reduced, but reliability deteriorates due to inaccurate fault location determination
Solution Approach 1:
The patent introduces an intermediary mathematical model (equivalent circuit model with shunt capacitances) that mediates between the simple current measurements and the accurate fault location determination. This model acts as a bridge that incorporates the effects of shunt capacitances through derived calculation algorithms, allowing accurate fault location without directly measuring voltage or complicating the measurement system.
3Productivity
If accurate fault location is achieved without voltage measurements, then productivity is improved through faster fault assessment, but measurement precision requirements worsen due to reliance on current measurements alone
Solution Approach 1:
The patent performs preliminary development of equivalent circuit models and calculation algorithms that are specifically tailored for current-only measurements. These pre-developed mathematical relationships and compensation methods are ready to be applied during actual fault events, enabling rapid and accurate fault location determination using only current measurements from existing relay equipment without requiring additional measurement infrastructure.
Data Source
AI summary
The present disclosure relates to a computationally efficient technique for determining a location of a fault on a power line using local measurements and remote current measurements. For example, a method may include receiving one or more local measurements of a power line. The method includes receiving a signal indicating one or more remote current measurements of the power line. The method includes determining a location of a fault on the power line based on a fault voltage multiplied by a conjugate of a compensated differential current. The method includes providing the location of the fault.