CONTROLLED CLOSING ON SHUNT REACTOR COMPENSATED TRANSMISSION-LINES .1. CLOSING CONTROL DEVICE DEVELOPMENT

A control device for point-on-wave closing or auto-reclosing of shunt reactor compensated transmission lines for reduction of closing overvo ltages is presented. The device is the first of its kind. It was put i nto field service successfully more than a year ago. Development aspec ts and basic investigations on the relevant transient switching phenom ena are presented. The algorithm employed works independently of the s hape of the voltage signal to be synchronized on by means of pattern r ecognition. Peculiarities of the hardware are high redundancy and a sy stem to bypass the controller at any malfunction of the electronic cir cuits. The efficiency of the controller was verified by a combination of transient network analyser tests and EMTP simulations showing the a bility of the device to suppress overvoltages. This procedure is gener ally recommended for future application of control devices as a type t est procedure.