1–4
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
DESCRIPTION OF THE 350 FEEDER PROTECTION SYSTEM
CHAPTER 1: INTRODUCTION
Figure 2: Single line diagram
Table 1: Protection functions
898742A1.CDR
350 RELAY
TRIP
BUS
LOAD
3
1
52
CLOSE
50G/
51G
50P
50
N
79
50G
51G
2
2
2
1
METERI
N
G
TRA
N
SIE
N
T RECORDER
EVE
N
T RECORDER
51
N
51P
50_2
1
1
1
49
1
1
27P
59P
27X
59X 59_2
59
N
81U
81O
CLP 50BF
79
1
1
1
1
1
1
2
2
MO
N
ITORI
N
G
BUS VT
67
N
67G
1
1
ANSI Device
Description
27P
Phase Undervoltage
27X
Auxiliary Undervoltage
49
Thermal Model
50P
Phase Instantaneous Overcurrent
50N
Neutral Instantaneous Overcurrent
50G
Ground/Sensitive Ground Instantaneous Overcurrent
50BF
Breaker Failure
50_2
Negative Sequence Overcurrent
51P
Phase Timed Overcurrent
51G
Ground Timed Overcurrent
51N
Neutral Timed Overcurrent
59P
Phase Overvoltage
59X
Auxiliary Overvoltage
59N
Neutral Overvoltage
59_2
Negative Sequence Overvoltage
67G
Ground Directional Element
67N
Netural Directional Element
79
Autoreclose
81U
Underfrequency
81O
Overfrequency
CLP
Cold Load Pickup