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OPERATION
ii
TABLE OF CONTENTS
3.2.19 DIELECTRIC STRENGTH TESTING ...................................................... 3-14
4.1 FRONT PANEL
4.1.1
DESCRIPTION .......................................................................................... 4-1
4.2 DISPLAY, INDICATORS, AND FRONT PORT
4.2.1
DISPLAY .................................................................................................... 4-2
4.2.2
LEDS.......................................................................................................... 4-2
4.2.3
STATUS INDICATORS.............................................................................. 4-2
a IN SERVICE............................................................................................... 4-2
b SELF-TEST ERROR.................................................................................. 4-2
c TEST MODE .............................................................................................. 4-2
d DIFFERENTIAL BLOCKED ....................................................................... 4-3
e LOCAL ....................................................................................................... 4-3
MESSAGE ................................................................................................. 4-3
4.2.4
SYSTEM STATUS INDICATORS .............................................................. 4-3
a TRANSFORMER DE-ENERGIZED ........................................................... 4-3
b TRANSFORMER OVERLOAD .................................................................. 4-3
c LOAD-LIMIT REDUCED ............................................................................ 4-3
d SETPOINT GROUP 1 ................................................................................ 4-3
e SETPOINT GROUP 2 ................................................................................ 4-3
SETPOINT GROUP 3 ................................................................................ 4-3
g SETPOINT GROUP 4 ................................................................................ 4-3
4.2.5
CONDITION INDICATORS........................................................................ 4-4
a TRIP ........................................................................................................... 4-4
b ALARM....................................................................................................... 4-4
c PICKUP...................................................................................................... 4-4
d PHASE A (B/C) .......................................................................................... 4-4
e GROUND ................................................................................................... 4-4
4.2.6
PROGRAM PORT ..................................................................................... 4-4
4.3.1
SETPOINT KEY ......................................................................................... 4-5
4.3.2
ACTUAL KEY............................................................................................. 4-5
4.3.3
ESCAPE KEY ............................................................................................ 4-5
4.3.4
ENTER KEY............................................................................................... 4-5
4.3.5
MESSAGE UP/DOWN KEY....................................................................... 4-5
4.3.6
VALUE UP/DOWN KEY............................................................................. 4-5
4.3.7
NUMBER KEYS ......................................................................................... 4-6
4.3.8
HELP KEY ................................................................................................. 4-6
4.3.9
RESET KEY ............................................................................................... 4-6
4.3.10 NEXT KEY ................................................................................................. 4-6
5.1.1
SETPOINT GROUPS ................................................................................ 5-1
5.1.2
SETPOINT ENTRY .................................................................................... 5-2
5.1.3
SETPOINT WRITE ACCESS..................................................................... 5-2
5.2.1
DESCRIPTION .......................................................................................... 5-3
5.2.2
A TYPICAL POWER TRANSFORMER ..................................................... 5-3
5.2.3
DYNAMIC CT RATIO MISMATCH CORRECTION ................................... 5-3
a PROBLEM 1:USE OF STANDARD CT RATIOS ....................................... 5-3
b PROBLEM 2: ONLOAD TAP CHANGER .................................................. 5-4
5.2.4
PHASE SHIFTS ON THREE-PHASE TRANSFORMERS ......................... 5-6
5.2.5
PHASE ANGLE CORRECTION ................................................................ 5-8
5.2.6
ZERO-SEQUENCE COMPONENT REMOVAL......................................... 5-9
745 Transformer Management Relay
GE Power Management
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