Settings - ABB RELION 620 Series Technical Manual

Section 4
Protection functions
4.1.2.8
Table 112: 51LT Group settings
Parameter Values (Range)
Pickup value 0.05...5.00
Pickup value mult 0.8...10.0
Time multiplier 1.00...15.00
Trip delay time 40...200000
Operating curve type 1=LT Ext Inv
2=LT Very Inv
3=LT Inv
4=LT Mod Inv
5=Long DT
6=Very LT Ext Inv
7=Very LT Very Inv
8=Very LT Inv
9=LT Normal Inv
14=IEC LT Inv
17=Programmable
Type of reset curve 1=Immediate
2=Def time reset
3=Inverse reset
Table 113: 51LT Non group settings
Parameter Values (Range)
Operation 1=enable
5=disable
Num of pickup phases 1=1 out of 3
2=2 out of 3
3=3 out of 3
Minimum trip time 20...60000
Reset delay time 0...60000
Measurement mode 1=RMS
2=DFT
3=Peak-to-Peak
Curve parameter A 0.0086...120.0000
Curve parameter B 0.0000...0.7120
Table continues on next page
162
Table 111: 51LT Output signals
Name Type
TRIP BOOLEAN
PICKUP BOOLEAN

Settings

Unit Step
xIn 0.01
0.1
0.01
ms 10
Unit Step
ms 1
ms 1
Description
Trip
Pickup
Default Description
2 Pickup value
1.0 Multiplier for scaling the pickup value
1.00 Time multiplier in IEC/ANSI IDMT curves
40 Trip delay time
5=Long DT Selection of time delay curve type
1=Immediate Selection of reset curve type
Default Description
5=disable Operation Disable / Enable
1=1 out of 3 Number of phases required for trip activation
20 Minimum trip time for IDMT curves
20 Reset delay time
2=DFT Selects used measurement mode
28.2000 Parameter A for customer programmable
curve
0.1217 Parameter B for customer programmable
curve
1MAC504801-IB E
620 series ANSI
Technical Manual