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Measuring relays and protection equipment -- Functional requirements for over/under voltage protection
This part of IEC 60255 specifies minimum requirements for over/under voltage relays. The standard includes specification of the protection function, measurement characteristics and time delay characteristics.
This standard defines the influencing factors that affect the accuracy under steady state conditions and performance characteristics during dynamic conditions. The test methodologies for verifying performance characteristics and accuracy are also included in this standard.
The over/under voltage functions covered by this standard are as follows:
|
IEEE/ANSI C37.2 Function numbers |
IEC 61850-7-4 Logical nodes |
|
|---|---|---|
| Phase undervoltage protection | 27 | PTUV |
| Positive sequence undervoltage protection | 27D | PTUV |
| Phase overvoltage protection | 59 | PTOV |
| Residual/zero-sequence overvoltage protection | 59N/59G | PTOV |
| Negative sequence/ unbalance overvoltage protection | 47 | PTOV |
The general requirements for measuring relays and protection equipment are specified in IEC 60255-1.
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