9-8 C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
OVERVIEW CHAPTER 9: THEORY OF OPERATION
9
Figure 9-3: Compensated bank neutral overvoltage application
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:
Eq. 9-27
This expression can be rearranged as follows.
Eq. 9-28
Multiplying both sides by –1 / C
A
and substituting the sum of the phase voltages with 3V
0
yields:
Eq. 9-29
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:
Eq. 9-30
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