Distance Element - GE Multilin 489 Instruction Manual

5.7.10 Distance Element

1 DISTANCE
ELEMENT
5–56
Courtesy of NationalSwitchgear.com
All relay quantities are in terms of secondary impedances. The formula to convert primary
impedance quantities to secondary impedance quantities is provided below.
Z
sec ondary
where: Z = primary ohms impedance;
primary
CT Ratio = programmed CT ratio,
if CT ratio is 1200:5 use a value of 1200 / 5 = 240;
VT Ratio = programmed VT ratio, if VT ratio is 100:1 use a value of 100
FIGURE 5–10: Loss of Excitation R-X Diagram
PATH: SETPOINTS S6 VOLTAGE ELEM.
[ ] STEP UP TRANSFORMER
SETUP: None
FUSE FAILURE
MESSAGE
SUPERVISION: On
ZONE #1
MESSAGE
TRIP: Off
ASSIGN ZONE #1 TRIP
MESSAGE
RELAYS (1-4): 1---
ZONE #1
MESSAGE
REACH: 10.0 Ωsec
ZONE #1
MESSAGE
ANGLE: 75°
ZONE #1 TRIP
MESSAGE
DELAY: 0.4 s
ZONE #2
MESSAGE
TRIP: Off
ASSIGN ZONE #2 TRIP
MESSAGE
RELAYS (1-4): 1---
Z × CT Ratio
primary
----------------------------------------------- -
=
VT Ratio
DISTANCE ELEMENT
Range: None, Delta/Wye
Range: On, Off
Range: Off, Latched, Unlatched
Range: Any combination of Relays 1 to
4
Range: 0.1 to 500.0 Ωsec in steps of 0.1
Range: 50 to 85° in steps of 1
Range: 0.0 to 150.0 s in steps of 0.1
Range: Off, Latched, Unlatched
Range: Any combination of Relays 1 to
4
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 5: SETPOINTS
(EQ 5.27)