Description - GE G30 Instruction Manual

PRODUCT DESCRIPTION
The following single-line diagrams illustrate the relay functionality using American National Standards Institute (ANSI)
device numbers.
Table 2-1: ANSI device numbers and functions supported
Device number Function
24 Volts per hertz
25 Synchrocheck
2
27P Phase undervoltage
27TN Third harmonic neutral undervoltage
27X Auxiliary undervoltage
32 Sensitive directional power
40 Loss of excitation
46 Generator unbalance
49 Thermal overload protection
50G Ground instantaneous overcurrent
50N Neutral instantaneous overcurrent
50P Phase instantaneous overcurrent
50SP Split phase protection
50/27 Accidental energization
51G Ground time overcurrent
2-2
Figure 2-1: Single-line diagram PTS on transformer HV side
CHAPTER 2: PRODUCT DESCRIPTION
Device number Function
51N Neutral time overcurrent
51PV Phase time overcurrent with voltage restraint
59N Neutral overvoltage
59P Phase overvoltage
59X Auxiliary overvoltage
59_2 Negative-sequence overvoltage
67_2 Negative-sequence directional overcurrent
67N Neutral directional overcurrent
67P Phase directional overcurrent
81O Overfrequency
81R Rate of change of frequency
81U Underfrequency
87RGF Restricted ground fault
87GT Generator/transformer differential
G30 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL