Research and development of control system for submarine cable pumping station

Abstract

Submarine cables are used in 500kV power transmission station. Insulating fluid was filled into the cables to protect them. There is a set of insulating fluid pumping station in Nanling and Linshi. The corresponding control systems were equipped to achieve the automatic control of insulating fluid pumping station in Nanling and Linshi. The control systems could meet different operating conditions. The rate and the pressure of the flow could be changed according to the set values by the control systems. The send-out and take-back of the Insulating fluid in Nanling and Linshi can be alternated by the control systems. The cables could be protected from seawater if the cables were damaged. The operation information could be sent to Fuzhou control center. The control system is built with the ControlLogix controller of AB. Different modules were used to collect signals according to different equipment types on site. The signals should be calculated, analyzed and optimized. The operations of the submarine cables could be acquainted according to the signals. The rate and direction of the Insulating fluid flow could be changed by the control system by starting or stopping the pump. Insulating fluid pressure at the outlet of submarine cable was maintained in the relative range and Insulating fluid flow remains at maximum in normal operation mode. Insulating fluid pressure at the outlet of submarine cable was maintained Above the minimum and Insulating fluid flow Decrease from maximum to the minimum In Emergency mode. The control system could meet the daily operation requirements of submarine cable stably after monitoring and recording long- term operation of the system. It could alert when the oil pump system was abnormal.it can protect the submarine cable from the seawater In emergency mode and the Insulating fluid would be the minimum to protect the environment.