List of ANSI Codes
ANSI
Functions
67N
Directional Neutral Overcurrent
67Ns
Sensitive Directional Neutral Overcurrent
74TC
Trip Circuit Supervision
78V
Vector Surge Protection
79
Auto Reclosure
81
Frequency Protection
81U
Underfrequency Protection
81O
Overfrequency Protection
81R
ROCOF (df/dt)
86
Lock Out
87B
Busbar Differential Protection
87G
Generator Differential Protection
87GP
Generator Phase Differential Protection
87GN
Generator Ground Differential Protection
87M
Motor Differential Protection
87T
Transformer Differential Protection
87TP
Transformer Phase Differential Protection
87TN
Transformer Ground Differential Protection
87U
Unit Differential Protection (protected zone includes generator and step-up transformer)
87UP
Unit Phase Differential Protection (protected zone includes generator and step-up transformer)
649
MRU4
DOK-HB-MRU4-2E