The following points to be noted for maintenance of
capacitor.
Use of HRC fuse or MCCBs for short circuit protection
of capacitor
Torque
T = F × r
Where
T = torque ( Newton meter or Lb – ft )
Gas Pressure Cables
|
Solid cable |
Oil cable |
|
As the thickness of insulation is more, the size and weight
of the cable is more |
As the thickness of dielectric ( insulation ) is less, the
size and weight of the cable is less |
|
Less current carrying capability |
As the thermal resistance of the cable is less, heat dissipation increases and this will result in current carrying capacity increases |
A cable may be single core / multi core depends upon
type of service for which it is employed. The LT cables are used for voltage
rating up to 1,000 V.
Single core LT cable
Core
Insulation
Lead Sheath
Bedding
Armouring
Why armouring is not used in the single core LT cable?
In order to avoid excessive armoring loss
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Minimum clearance between transmission line conductor
and ground
Standard alternating voltage in India
Right of way in the transmission line
Screened cable
The screened cables are used for voltage up to 33 kV,
but it may be applicable for 66 kV also. There are two types of screened cable
: H type cable and SL type cable.
H type cable
Belted cable ( Multi core cable )
Significance
The short circuit on the single phase transformer is performed in order to find out
equivalent circuit parameters of the transformer. This test is performed to
find out
In this theory, effect of temperature,
voltage and current on the life of capacitor is given. The life of capacitor is
affected by
The temperature depends upon following parameters.
Ambient temperature at which capacitor is operated
