Method for monitoring the insulating gas of pressurised-gas-insulated switchgears and control device for implementing this method

摘要

The invention relates to an improved method for monitoring the insulating gas of pressurised-gas-insulated switchgears. The state variables pressure and temperature are detected in each compartment (1) by means of a temperature-compensated pressure sensor (2), while in a microprocessor (10) belonging to a central processing unit (3), the signals input for the gas density ( sigma G) are converted into values of the dielectric strength (U) with the aid of suitable software. When the voltage drops below a certain voltage level (Up) dependent on the nominal voltage, interruption of the damaged system part or other measures are implemented by the microprocessor (10). The novel method can also advantageously be connected to an electronic network control system, as a result of which the availability of the power supply is increased. <IMAGE>