GE C70 Instruction Manual page 528

OVERVIEW
9.1.4.2 Balanced case
To understand neutral voltage unbalance protection, we can start with Kirchhoff's current law for the neutral node of the
bank:
This expression can be rearranged as follows.
Multiplying both sides by –1 / C
As the left hand side of this equation is equal to zero, we can subtract it from the expression inside the absolute value
brackets in equation 9.25 to get:
9
9-8
Figure 9-3: Compensated bank neutral overvoltage application
and substituting the sum of the phase voltages with 3V
A
C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
CHAPTER 9: THEORY OF OPERATION
Eq. 9-27
Eq. 9-28
yields:
0
Eq. 9-29
Eq. 9-30