TH98320B - Methods for detecting and locating faults in high resistance power lines using phase angle and current magnitude - Google Patents

Abstract

DC60 High Resistance Distribution Line Detection and Location System (i) incorporates high resistance detection using phase angle and current magnitude. Using only a current transformer as a current detector, the incoming signal is processed to detect high resistance faults that cannot be detected by existing protection devices. Furthermore, this detection system can identify four types of faults in a single-feeder distribution system and three types in a multi-feeder distribution system. (ii) The high resistance location system can identify fault locations, whereas other monitoring devices and procedures cannot distinguish fault types based on current analysis alone. The accuracy of the process is also high because it uses the phase angle of the distribution system as the primary criterion for monitoring the status of the distribution system. However, faults cause phase angles that differ from the available phase angles in the distribution system, thus providing a more accurate indication of the fault. The introduction of current measurement devices in conjunction with the fault detection system at every junction in the distribution system, instead of at the load point, reduces the number of measurement points and communication ports. The fault detection system provides communication ports and a backup power source in case of failure of the communication port and the main power source. The high-resistance fault detection and location system (i) consists of a high-resistance fault detection process that uses phase angle and current magnitude. Using only a current transformer as a current detector, the incoming signal is processed to detect high-resistance faults that cannot be detected by existing protection devices. Furthermore, this fault detection system can identify four types of faults in a single-feeder distribution system and three types in a multi-feeder distribution system. (ii) The high-resistance fault location system can identify fault locations, whereas other devices and procedures cannot distinguish fault types based on current analysis alone. The accuracy of the process is still high because the phase angle of the distribution system is the primary criterion for monitoring the status of the distribution system. However, the fault causes a phase angle that differs from the existing phase angle of the distribution system, thus providing a more accurate indication of the fault. The introduction of current measurement devices in conjunction with fault detection systems at every junction in the distribution system, instead of at the load point, reduces the number of measurement points and communication ports. The fault detection system provides communication ports and a backup power source in case of failure of the communication port and the main power source.

Claims (1)

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