Question

The capacitances per Km of 3 core cable are 0.9 micro
farad between the three bunched conductor and the sheath, and 0.4
micro farad between one conductor and the other two connected to
the sheath. Draw the arrangement in each case and find:

a) the line to ground capacitance of a 20 Km cable length.

b) charging current if the cable operates at 11 KV line voltage at
50 HZ.

c) the power loss and loss angle if the power factor is 0.2 .

Answer #1

A 132 KV, 50 HZ, 3 phase, 3 core metal sheathed cable gave the
following resutls in testing for capacitance:
(a) capacitance between shorted conductors and sheath is 0.8 micro
farad.
(b) capacitance between two conductors shorted with sheath and the
third conductor is 0.6 micro farad.
Draw the test arrangment in each case and determine:
(i) the capacitance between any two conductors.
(ii) the conductor self capacitance and the capacitance between any
two shorted conductors and the third conductor....

The capacitance of a 3 core cable belted type are
measured and found as follows:
(i) the capacitance between 3 cores connected together and the
sheath is 8 uF.
(ii) the capacitance between one core conductor and the other two
conductors connected together to the sheath is 5 uF.
Draw the measurement configuration and the equivalent circuit for
both cases and calculate:
a) the capacitance to the neutral and the capacitance between any
two conductors.
b) the charging current and...

A 250 km , three- phase , 50 Hz transmission line is delivering
25 MVA at 0.8 lagging power factor to a balanced load at 132 KV (
line-line) . The conductor resistance is 0.11 ohm/km . The line
inductance per phase is 1.24 mH/km and the line to neutral
capacitance is given as 9.4 x 10 – 9 F/km.
a ) find the nominal – Л representation.
b) find the sending end voltage , VS by nominal – Л...

1- A 69-kV, three-phase short transmission
line is 16 km long. The line has a per
phase series impedance of 0.125 +
j0.4375 ohm per km. Determine the sending
end voltage, voltage regulation, the
sending end power, and the transmission
efficiency when the line delivers
a. 70 MVA, 0.8 lagging power factor at 64 kV
b. 120 MW, unity power factor at 64 kV
2-three-phase, completely transposed 345-kV, 200 km
line has two 795,000-
cmil 26/2 ACSR conductor per bundle...

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