The overload cutting unit equipment of 500kV line applying in 4*1000MW generator at Huaneng Yuhuan power station

By installing device on line overload cutting unit, it improves transportation ability in Yutang 5429 and Yuling 5430 double lines on Yuhuan power station. Moreover, this method could resolve N-1 fault that happen one transportation line between Yuhuan and Tanglin station, which bring on residual line serious overload and damage equipment of electric network or destroy stabilization on local power system. The device adopt double setting and install 500kV protection chamber of relay building, which connect three phase current and voltage as measure data belong to Yutang 5429 and Yuling 5430 double lines. As logic condition and measure data satisfy controlling strategy on overload cutting unit equipment, it close up main valve of #3 units and start aside generator current breaker.