Distance protection is the most common type of protection in practical use for protecting power transmission lines.
Distance protection is the most common type of protection in practical use for protecting power transmission lines. The function of the distance protection system is to detect a short-circuit fault on the transmission line, and to send a tripping command to the line circuit breaker following the fault detection. The fault detection is based on real-time distance-to-fault measurement derived from the calculation of the impedance of the line section between the protection and fault location. Following the restructuring of the power supply industry, the trend for interconnecting separate power systems is on the increase. The interconnections often require long-distance power transmission lines. However, the power transfers amongst the interconnected systems are limited by the transmission line lengths, and system stability margin can be reduced. Series compensation increases the power transfer capability of the transmission line and system transient stability. However, the use of series compensation which is based on capacitors will influence the impedance calculation required in distance protection. The objectives of the project are to investigate the impact of series compensation on the accuracy of distance protection responses, and to design schemes to counter the impact.
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