Abstract
A single-end fault location method for single-phase nonmetallic grounding faults of transmission lines in a double terminal system is studied and proposed. First, the reason for the poor accuracy of the single-end fault location method in case of single-phase nonmetallic grounding faults is analyzed theoretically, and the necessary conditions for the single-end accurate fault location are put forward. Second, under the necessary conditions of the single-end accurate fault location, according to the topology of fault component networks, the calculation method of the single-end accurate fault location of transmission lines in a double terminal system is studied. Moreover, the influence of line capacitance is considered in this fault location method, and a simple expression for calculating the fault distance is obtained. Finally, the transmission line with a single-phase nonmetallic grounding fault is modeled in PSCAD; therefore, the correctness and the ability against transition resistance of the new single-end fault location method are verified by simulation.
Highlights
In the operation of power systems, most faults occur in transmission lines; timely repair after line faults is the key to ensure the reliability of power supply
This work studies a new method of the single-end fault location for single-phase grounding faults of the transmission lines passing through transition resistances, puts forward the necessary conditions and the accurate location method of the single-end accurate fault location, and solves the problem of poor accuracy of the single-end fault location in principle
The simulation results show that the single-end accurate fault location method proposed in this study really has sufficient accuracy and a strong ability against transition resistances, and the advantages are as follows: fault location
Summary
In the operation of power systems, most faults occur in transmission lines; timely repair after line faults is the key to ensure the reliability of power supply. The relative errors of all fault location results are within 2%
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