GE 845 Instruction Manual page 12

DESCRIPTION OF THE 845 TRANSFORMER PROTECTION RELAY
1–4
Table 1-1: ANSI Device Numbers and Functions
ANSI Device
24
27P
27X
49
50/87
50BF
50G
50N
50P
50_2
51G
51N
51P
51_2
59N
59P
59X
67G
67N
67P
81O
81U
81R
87G
87T
VTFF
Table 1-2: Other Device Functions
Description
2
Breaker Arcing Current (I t)
Breaker Control
Breaker Health
Data Logger
Demand
Digital Counters
Event Recorder
Fault Report
Flexelements
FlexLogic Equations
Flexstates
IEC 61850 Communications
Metering: current, voltage, power, PF, energy, frequency, harmonics, THD
Modbus User Map
Non-volatile Latches
Description
Voltz per hertz
Phase Undervoltage
Auxiliary Undervoltage
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
Neutral Overvoltage
Phase Overvoltage
Auxiliary Overvoltage
Ground Directional Element
Neutral Directional Element
Phase Directional Element
Overfrequency
Underfrequency
Frequency Rate of Change
Restricted Ground Fault (RGF)
Transformer differential
Voltage Transformer Fuse Failure
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 1: INTRODUCTION