1–4 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
DESCRIPTION OF THE 850 FEEDER PROTECTION SYSTEM CHAPTER 1: INTRODUCTION
Table 1-2: Other Device Functions
51_2 Negative Sequence Time Overcurrent
52 AC Circuit Breaker
Pole Discordance
55 Power Factor
59N Neutral Overvoltage
59P Phase Overvoltage
59X Auxiliary Overvoltage
59_2 Negative Sequence Overvoltage
67G Ground Directional Element
67SG Sensitive Ground Directional Element
67N Neutral Directional Element
67P Phase Directional Element
67_2 Negative Sequence Directional Element
79 Automatic Recloser
81O Overfrequency
81U Underfrequency
81R Frequency Rate of Change
87G Restricted Ground Fault (RGF)
AFP Arc Flash Protection
CLP Cold Load Pickup
I1/12 Broken Conductor
MCB Manual Close Blocking
SOTF Switch Onto Fault
VTFF Voltage Transformer Fuse Failure
Description
Analog Input
Analog Output
Automatic Bus Transfer Scheme (MTM)
Breaker Arcing Current (I
2
t)
Breaker Control
Breaker Health
CT Supervision
Current/Power Demand
Data Logger
Digital Counters
Event Recorder
Fault Report and Fault Locator
Fast Underfrequency
Flexelements
FlexLogic Equations
Flexstates
Harmonic Detection
IEC 61850 Communications
Metering: current, voltage, power, PF, energy, frequency, harmonics, THD
Load Encroachment
ANSI Device Description
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