Description - GE G60 Instruction Manual

PRODUCT DESCRIPTION
The following single-line diagram illustrates the relay functionality using American National Standards Institute (ANSI)
device numbers.
Table 2-1: ANSI device numbers and functions
Device number
21P
24
2
25
27P
27TN
27X
32
40
46
49
50BF
50G
50N
50P
50SP
50/27
51G
51PV
2-2
Function
Phase distance backup
Volts per hertz
Synchrocheck
Phase undervoltage
Third harmonic neutral undervoltage
Auxiliary undervoltage
Sensitive directional power
Loss of excitation
Generator unbalance
Thermal overload protection (RTD)
Breaker failure
Ground instantaneous overcurrent
Neutral instantaneous overcurrent
Phase instantaneous overcurrent
Split phase protection
Accidental energization
Ground time overcurrent
Phase time overcurrent with voltage
restraint
CHAPTER 2: PRODUCT DESCRIPTION
Device number Function
51N Neutral time overcurrent
59N Neutral overvoltage
59P Phase overvoltage
59X Auxiliary overvoltage
59_2 Negative-sequence overvoltage
64F Field ground protection
64S Sub-harmonic stator ground protection
64TN 100% stator ground
67_2 Negative-sequence directional overcurrent
67N Neutral directional overcurrent
67P Phase directional overcurrent
68 Power swing blocking
78 Out-of-step protection
81O Overfrequency
81R Rate of change of frequency
81U Underfrequency
87RGF Restricted ground fault
87S Stator differential
G60 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL