ANSI/IEEE C37.90 specifies standard service conditions, standard ratings, performance requirements, and testing requirements for relays and relay systems used to protect and control power apparatus. The standard establishes a common reproducible basis for designing and evaluating relays and relay systems. According to ANSI/IEEE C37.90, a relay system may include computer interface equipment and/or communications interface equipment, such as a carrier transmitter/receiver or audio tone equipment. ANSI/IEEE C37.90 does not cover relays designed primarily for industrial control, for switching communication or other low-level signals, or any other equipment not intended for control of power apparatus.
Retrieved from IHS 10-31-2013
Products Used in Testing:
EM Test OCS 500N6 Oscillatory Wave Simulator
The EM Test OCS 500N6 Oscillatory Wave Simulator includes test capabilities for ringwave up to 6kV (as per IEC 61000-4-12) and the damped oscillatory waves at 100kHz and 1MHz up to 3kV (as per IEC 61000-4-18). The Ringwave is a...
EMC Partner DOW3000 Oscillatory Wave Generator
The EMC Partner DOW3000 Oscillatory Wave Generator produces Damped Oscillatory Wave (DOW) signals via a 32A capacitative coupling clamp at an oscillation frequency of 3, 10 or 30MHz, with a usable cable diameter of 4 - 70mm and...