Over deze norm
Specifies the performance requirements of directional relays and power relays with two input energizing quantities as well as methods of presenting the characteristics and performance of these relays. Excludes impedance relays and deals specifically with: relays measuring phase angle (direction); relays measuring power. All tests are type tests.
|Engelse titel||Electrical relays - Part 12: Directional relays and power relays with two input energizing quantities|