Current transformer and instrument transformer combined for metal-enclosed gas-insulated high-voltage equipment

摘要

The combined voltage and current transducer is intended for a metal-encapsulated, gas-insulated high-voltage installation. It exhibits a current and voltage sensor (10) and a signal processing device following the current and voltage sensor (10). A toroidally wound coil (14) is used as current sensor and a hollow cylindrical sensing electrode (15) is used as voltage sensor. After the current and voltage sensor (10) has been installed in the metal encapsulation (4), coil (14) and sensing electrode (15) concentrically surround a current conductor (5) in the installation. This combined voltage and current transducer should be inexpensive to produce, have small dimensions and, nevertheless, be distinguished by high sensing accuracy. This is achieved by current and voltage sensor (10) being constructed in such a manner that signals corresponding to the change with time of the current to be determined of the voltage to be determined are present at their outputs and that the signal processing device exhibits at least one integrating device which is acted upon by the output signals of current and voltage sensor (10). IMAGE