For solving such problem as insufficient reactive power and unqualified voltage quality existingfor a long time in the remote area in China

a kind of series capacitor compensation device for 10 kV distribution grid is developed. Capacitor is the core equipment of the series compensation device of the distribution grid

the thyristor switch and bypass contactor in combination consists in the overvoltage protection equipment of series compensation of distribution grid and the operation of circuit breaker and disconnector can achieve switching on and switching off of the series compensation system of the distribution grid. The series compensation device of the distribution grid is equipped with voltage transformer

current transformer for the measurement of voltage of incoming line

current of line and voltage of capacitor. The device consists of regional grid with the main station of the distribution grid through wireless communication module to submit real time operation information and for the convenient monitoring of the main station. Such key technology of the device as overvoltage protection mode and impedance protection of capacitor etc is described in detail. The developed series compensation device of distribution grid has been in operation in Jiangsu power grid successfully. It is proved by the experience and results that the device can compensate lowvoltageoflineverywell

optimize power factor and have perfect economic and social benefit.