GE L30 Instruction Manual page 303

CHAPTER 5: SETTINGS
and
POSITIVE ZERO SEQUENCE CAPACITIVE REACTANCE
the protected line are required for charging current compensation calculations. The line capacitive reactance values are
entered in primary kilo-ohms for the total line length.
If shunt reactors are also installed on the line, the resulting value entered in the
settings are calculated as follows:
SEQ CAPACITIVE REACTANCE
Three-reactor arrangement — Three identical line reactors (X
Four-reactor arrangement — Three identical line reactors (X
connected between reactor-bank neutral and the ground.
where
X = the total line positive-sequence capacitive reactance
1line_capac
X = the total line zero-sequence capacitive reactance
0line_capac
X = the total reactor inductive reactance per phase. If identical reactors are installed at both line ends, the value of the
react
inductive reactance is divided by 2 (or 3 for a three-terminal line) before use in the previous equations. If the reactors
installed at both ends of the line are different, the following equations apply:
For two terminal line:
For three terminal line:
where
L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
Figure 5-53: Charging current compensation configurations
— The values of positive and zero-sequence capacitive reactance of
POS SEQ CAPACITIVE REACTANCE
) solidly connected phase to ground:
react
) wye-connected with the fourth reactor (X
react
SYSTEM SETUP
and
ZERO
5
Eq. 5-7
)
react_n
Eq. 5-8
Eq. 5-9
Eq. 5-10
5-125