CURRENT SENSOR FOR ELECTRONIC TRIPPING DEVICE OF CIRCUIT BREAKER

摘要

PURPOSE: To obtain a simple and accurate current sensor capable of being used instead of the current transformer of an electronic tripping apparatus to be applied to both AC and DC. CONSTITUTION: The current sensor 13 of the electronic tripping apparatus for a breaker has a tubular shunt resistor 16 of a hollow cylindrical shape. An electronic processor 23 is provided in the resistor 16. The processor 23 has an amplifier A and an input resistor Re brought into thermal contact with the inner surface of the resistor 16.