GE C70 Instruction Manual page 513

CHAPTER 8: APPLICATION OF SETTINGS
The maximum rated phase current of the healthy bank:
The maximum rated voltage across the healthy top section:
The maximum rated voltage across the healthy bottom section:
The voltage distribution factor for the healthy perfectly balanced bank for the 87V-2 and 87V-3 elements:
The impedance of the string for the failed capacitors elements (for one failed element, n
The voltage at the tap in the section with one failed capacitor element in the string:
The voltage of the top section with one capacitor element failed:
The overvoltage at the affected capacitors with one capacitor element failed:
The differential voltage between two taps with one failed capacitor element in the upper string, assuming K = 1 for 87V-1,
in per-unit values is:
The differential voltage between the bus voltage and the tap with one failed capacitor element in the upper string,
assuming K = 1, for 87V-3 in per-unit values is:
The unbalance current in the window type CT between two strings with one failed capacitor element in the upper string:
C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
SETTINGS EXAMPLE
Eq. 8-11
Eq. 8-12
Eq. 8-13
Eq. 8-14
= 1:
f
Eq. 8-15
Eq. 8-16
Eq. 8-17
Eq. 8-18
Eq. 8-19
Eq. 8-20
Eq. 8-21
8
8-15