Video 1 - Earthing of AC substation
Basic Part -1, consist of basics
about earthing Design in AC outdoor
substation.
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Video 2- Earthing of AC substation
(Tolerable step and Touch Voltage )
Part -2 covers about the tolerable
step and touch voltage and also
covers the correction factor Cs
which needs to be used to modify the
resistivity due to addition of
gravel in a substation.
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Earthing of AC substation- Design
Calculation Example-1. Sample
calculation is performed for
40kA rms fault current without
division factor and fault duration
of 1sec. The Mesh voltage and
Step voltage which are attained in a
substation are determined.
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Earthing of AC substation Part 4 -
Design Calculation
Example-2 Sample calculation is
performed on 220kV substation with
six Transmission lines connected to
it, with fault contribution of each
line of 3.5 kA. Two future lines are
also considered. Hence 28kA rms
fault current is considered. The
220kV Switchyard is protected by Bus
bar differential protection.
Tripping time is assumed as 100ms.
The fault current division factor is
calculated. Decrement factor is also
calculated to take into account DC
offset and asymmetrical
current. The Mesh voltage and
Step voltage which are attained in a
substation are determined. |
More than 1250 videos to come
please watch this space
|
More than 1250 videos to come
please watch this space |
