Calculating Settings For Global Base Values For Setting Function Gbasval - ABB REL650 Applications Manual

1MRK 506 334-UUS A
3.1.2
Application manual
1. Set the primary and secondary values for current transformer input 1.
1.1. Set CT_WyePoint1 to ToObject
(The CT secondary is grounded towards the protected line)
1.2. Set CTSec1 to 1 A
(The rated secondary current of the CT)
1.3. Set CTPrim1 to 1000 A
(The rated primary current of the CT)
2. Set the same values for the current inputs 2 and 3.
Current input 4 can be used for residual current input from parallel
line. This current is normally used for compensation of the fault
locator function influence from the parallel line. In this application
the input is not used.
Current input 5 can be used for connection of a current transformer
dedicated for residual current protection. A special current
transformer with a ratio adapted to achieve high sensitivity of the
protection is used. In this application the input is not used.
3. Set the primary and secondary values for voltage transformer inputs 6.
3.1. Set VTSec6 to 110 V
(The rated secondary voltage of the VT, given as phase-phase voltage)
3.2. Set VTPrim6 to 143 kV
(The rated secondary voltage of the VT, given as phase-phase voltage)
4. Set the same values for inputs 7 and 8.
Voltage inputs 9 and 10 can be used for busbar voltage measurement
to enable the synchronism check function. In this application the
inputs are not used.
Calculating settings for Global base values for setting function
GBASVAL
Each function uses primary base values for reference of settings. The base vaules are
defined in Global base values for settings function. It is possible to include up to six Global
base values for settings functions. Only one Global base values for settings functions is
Section 3
REL650 setting examples
43