GE L60 Instruction Manual page 267

5 SETTINGS
2. Three-reactor arrangement: three identical line reactors (X
3. Four-reactor arrangement: three identical line reactors (X
connected between reactor-bank neutral and the ground.
X
C1
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 ends of the line,
react
the inductive reactance is divided by 2 (or 3 for a three-terminal line) before inserting in the above equa-
tions. If the reactors installed at both ends of the line are different, the following equations apply:
1. For a two-terminal line:
2. For a three-terminal line:
X = the total neutral reactor inductive reactance. If identical reactors are installed at both ends of the line,
react_n
the inductive reactance is divided by 2 (or 3 for a three-terminal line) before inserting in the above
equations. If the reactors installed at both ends of the line are different, the following equations apply:
1. For a two-terminal line:
2. For a three-terminal line:
Charging current compensation calculations should be performed for an arrangement where the VTs are con-
nected to the line side of the circuit; otherwise, opening the breaker at one end of the line will cause a calcula-
tion error. The calculated charging current per line terminal is recorded in oscillography per each phase.
NOTE
GE Multilin
X ⋅ X
1line_capac react
------------------------------------------------
X , X
=
C1
X X
–
react 1line_capac
⋅
X X
1line_capac react
------------------------------------------------
, X
=
C0
X X
–
react 1line_capac
X 1
=
react
X
=
react
X
=
react_n
X
react_n
L60 Line Phase Comparison System
) solidly connected phase to ground.
react
X ⋅ X
0line_capac react
------------------------------------------------
=
C0
X X
–
react 0line_capac
) wye-connected with the fourth reactor (X
react
⋅ (
X X + X 3
0line_capac react react_n
-------------------------------------------------------------------------------- -
=
X + X 3 X
–
react react_n 0line_capac
1 1

⁄ ---------------------------------- - ---------------------------------- -
+

X X
react_terminal1 react_terminal2
1 1

⁄ ---------------------------------- - ---------------------------------- -
1
+

X X
react_terminal1 react_terminal2
1

⁄ --------------------------------------- - --------------------------------------- -
1
+

X X
react_n_terminal1 react_n_terminal2
1

⁄ --------------------------------------- - ------------------------------------------
1
= +

X X
react_n_terminal1 react__n_terminal2
5.5 GROUPED ELEMENTS
(EQ 5.8)
react_n
)
(EQ 5.9)


1

---------------------------------- -
+

X
react_terminal3
1


1 1

--------------------------------------- -
+

X
react_n_terminal3
5-129
)
5