GE 850 - Page 15

CHAPTER 1: INTRODUCTION DESCRIPTION OF THE 850 FEEDER PROTECTION SYSTEM
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–5
Figure 1-3: 850-P Single Line Diagram
Table 1-1: Model-specific ANSI Device Numbers and Functions
ANSI
Device
Description 850-E
Industrial
850-D
Distribution
850-P
Padmount
21YN Neutral Admittance Y (3) Y (3)
25 Synchrocheck Y Y
27P Phase Undervoltage Y (4) Y (8) Y (8)
27Q UV Reactive Power Y (4) Y (4)
27T Timed Undervoltage Protection Y (4) Y (4)
27X Auxiliary Undervoltage Y (2) Y (4)
32 Directional Power Y (4) Y (4)
32N Wattmetric Ground Fault (Wattmetric zero sequence directional) Y (4) Y (4)
37 Undercurrent Y (3)
49 Thermal Overload Y (2) Y (2)
50BF Breaker Failure Y (2) Y (4) Y (4)
50G Ground Instantaneous Overcurrent Y (1) Y (8) Y (12)
50SG Sensitive Ground Instantaneous Overcurrent Y (1) Y (4)
50N Neutral Instantaneous Overcurrent Y (2) Y (8) Y (16)
50P Phase Instantaneous Overcurrent Y (2) Y (8) Y (16)
50_2 Negative Sequence Instantaneous Overcurrent Y (1) Y (8) Y (16)
51G Ground Time Overcurrent Y (1) Y (4) Y (6)
51SG Sensitive Ground Time Overcurrent Y (1) Y (2)
51N Neutral Time Overcurrent Y (2) Y (4) Y (8)
51P Phase Time Overcurrent Y (2) Y (4) Y (8)
51_2 Negative Sequence Time Overcurrent Y (1) Y (4) Y (8)
52 AC Circuit Breaker Y (3)
Pole Discordance Y (3)
55 Power Factor Y Y
3CTs
51N 50N
METERING
TRANSIENT RECORDER
EVENT RECORDER
FAULT REPORT
BUS
TRIP CLOSE
MONITORING
50BF 51P 50P 51_2 50_2
50G/
51G
51G 50G
BUS
Switch
850P Padmount Protection System
MCB
Demand
Pulsed Outputs
Harmonic Detection
AFP
3
C
T
s
S
w
i
t
c
h
59
N
27
P
59
P
59
_
2
3CTs
LOAD
52
BREAKER
3CTs
LOAD
52
BREAKER
LEA1
LEA2
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