Trip circuit supervision relay for low and medium voltage applications

摘要

A Trip Circuit Supervision (TCS) relay for Low and Medium Voltage applications operatively connectable to a trip circuit of a Low or Medium Voltage apparatus, said TCS relay comprising first means for detecting the current circulating in said trip circuit, second means for detecting the continuous component of the current circulating in said trip circuit, third means for detecting the presence of pulses in the current circulating in said trip circuit, first enabling means for enabling said third means for detecting the presence of pulses in the current circulating in said trip circuit, signal generating means connected in input to said second and third means for detecting, respectively, the continuous component of and the presence of pulses in the current circulating in said trip circuit, and connected in output to control means operatively connectable to alarm generating means.

主权项

1. A Trip Circuit Supervision relay for Low and Medium Voltage applications operatively connectable to a trip circuit of a Low or Medium Voltage apparatus, comprising:
a power and control circuit driving an actuator of said Low or Medium Voltage apparatus, said power and control circuit including a pulse current generator that drives a pulsed current in said trip circuit; a first detector configured to detect the current circulating in said trip circuit; a second detector configured to detect the continuous component of the current circulating in said trip circuit; a third detector that can be selectively enabled and that is configured to detect the presence of pulses, including at least pulses generated by the pulse current generator, in the current circulating in said trip circuit, a first enabling circuit configured to enable said third detector and responsive to at least an enable signal, said enable signal being independent of current circulating in the power and control circuit; an alarm generating circuit; a controller connected to the alarm generating circuit; wherein the third detector, when enabled, and in response to a failure to detect pulses generated by the pulse current generator, cooperates with the alarm generating circuit to generate an alarm.