Constant voltage transformers (CVTs), or ferroresonant transformers, produce a constant secondary (output) voltage for varying primary (input) voltages within a certain range. With CVTs, the ...

ANSI C12.11 - Instrument transformers for revenue metering, 10kv bil through 350kv bil (0.6 kv nsv through 69 kv NSV). BS EN 50482 - Instrument transformers - three-phase inductive voltage ...