GE 845 Instruction Manual page 14

DESCRIPTION OF THE 845 TRANSFORMER PROTECTION RELAY
1–4
Table 1-1: ANSI Device Numbers and Functions
ANSI Device
24
25
27P
27X
32
49
50/87
50BF
50G
50N
50P
50_2
51G
51N
51P
51_2
55
59N
59P
59X
59_2
67G
67N
67P
81O
81U
81R
87G
87T
AFP
VTFF
Table 1-2: Other Device Functions
Description
Analog Input
Analog Output
2
Breaker Arcing Current (I t)
Breaker Control
Breaker Health
Data Logger
Demand
Digital Counters
Event Recorder
Fault Report
Description
Volts per Hertz
Synchrocheck
Phase Undervoltage
Auxiliary Undervoltage
Directional Power
Hottest Spot Temperature
Aging Factor
Loss of Life
Instantaneous Differential Overcurrent
Breaker Failure
Ground Instantaneous Overcurrent
Neutral Instantaneous Overcurrent
Phase Instantaneous Overcurrent
Negative Sequence Instantaneous Overcurrent
Ground Time Overcurrent
Neutral Time Overcurrent
Phase Time Overcurrent
Negative Sequence Time Overcurrent
Power Factor
Neutral Overvoltage
Phase Overvoltage
Auxiliary Overvoltage
Negative Sequence Overvoltage
Ground Directional Element
Neutral Directional Element
Phase Directional Element
Overfrequency
Underfrequency
Frequency Rate of Change
Restricted Ground Fault (RGF)
Transformer Differential
Arc Flash Protection
Voltage Transformer Fuse Failure
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 1: INTRODUCTION