ANSI Standard.
In the design of electrical power systems, the ANSI Standard Device Numbers denote what features a protective device supports (such as a relay or circuit breaker). These types of devices protect electrical systems and components from damage when an unwanted event occurs, such as an electrical fault.
ANSI numbers are used to identify the functions of medium voltage microprocessor devices.
ANSI facilitates the development of American National Standards (ANS) by accrediting the procedures of standards developing organizations (SDOs). These groups work cooperatively to develop voluntary national consensus standards.
Phase Distance Relay (21G)
GT 786MVA 525kV(±5%)/ 22.8kV %IZ = 16.5%
G 802MVA 22.8kV 50Hz
VT 22,000 / 110V
CT 25,000 / 5A
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