Instruction Manual
© GE Grid Solutions
8.6. Capacitance and dissipation factor
with temperature variation
The curves for the variation of the
capacitance and the dissipation factor
with temperature are presented in
the following figures:
Capacitance variation with temperature
Dissipation factor(Tg) variation with temperature
9. MANTENANCE AFTER ENERGIZING
After installation and energizing, the CVT
should not require any further intervention.
However, it is suggested to perform a visual
inspection during the first weeks of service
to:
•Confirm the position of oil level indicator. If
the indicator is significantly below or above
the green range, in comparison with other
CVT, it is recommended to check that there is
no oil leakage and, if an oil leakage is
discovered remove the CVT from operation
and inform GE.
•With an infrared device, check if
connections are not overheating. Compare
with other CVT from the same circuit.
After one year of operation, it is
recommended a detailed inspection of
tightening torques and oil leakage and
thereafter twice per year according to the
substation maintenance contract.
If possible, GE suggests disconnecting the
CVT and to perform the following
examination:
•Insulator: Depending on the pollution level
it is necessary to clean the porcelain.
•Metallic components: check for corrosions.
•Tightening torque of primary and secondary
connections. Any adjustments should be
carried out.
•Secondary terminal box: If necessary clean
inside the terminal box.
•Confirm oil level indicator and if there is oil
leakage.
•Access to the bellows and confirm if there is
an oil leakage near the fixation of the bellows
and / or if the bellows is in good condition
(no deformations)
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