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IEEE C37.90-2005 pdf free

IEEE C37.90-2005 pdf free.IEEE Standard for Relays and Relay Systems Associated with Electric Power Apparatus.
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 relay and relay systems. Annex A provides a cross-reference to the applicable IEC standards. Certain specific tests required for relays and relay systems are covered in separate IEEE standards as noted below.
Required surge tests are documented in IEEE Std C37.90.ITM_2002’. Standardized test waveforms that are representative of surges observed and measured in actual installations arc applied to the terminals of the system. The relay or relay system must be able to withstand the applied surges without damage to components and without operating incorrectly.
Required susceptibility tests are documented in IEEE Sid C37.90.2TM_1995. The tests establish a method to evaluate the susceptibility of the relay under test to single frequency electromagnetic fields in the radio frequency domain, such as those generated by portable or mobile radio transceivers.
Required electrostatic discharge tests are documented in IEEE Std C37.90.3TM_2001. Generators which that produce a standard waveform are used to apply discharges to conductive and non-conductive points on equipment under test. The test is perfbrmed to confirm that relays and relay systems will not misoperate or be damaged when installed, energized, andJor subjected to a specified electrostatic discharge.
1.1 Scope
This standard specifies standard service conditions, standard ratings, performance requirements, and testing requirements for relays and relay systems used to protect and control power apparatus. A relay system may include computer interface equipment and/or communications interface equipment, such as a carrier transmitter/receiver or audio tone equipment. It 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.IEEE C37.90 pdf free download.

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