DARLIPALLI STPP-I(2X800 MW)
Switchyard Package
SALIENT TECHNICAL FEATURES
The switchyards at Darlipalli STPP-I (2 X 800 MW) envisaged under 'Switchyard Package' are of 765 kV & 132 kV level with 765 kV system employing "One and a Half Breaker scheme" and 132 kV system employing "Double Main Bus scheme".
SYSTEM PARAMETERS
The system parameters shall be as under:
|
|
|
|
765 kV |
132kV |
33KV
|
|
a) |
Highest system voltage
|
: |
800 kV rms |
145 kV rms |
36 kV |
|
b) |
Lightning Impulse voltage
|
: |
±2100kVp |
± 650kVp |
± 170kVp |
|
c) |
Switching impulse voltage
|
: |
±1550kVp |
----- |
----- |
|
d) |
Power frequency withstand voltage for 1 min. (rms) |
: |
830 kV(rms) |
275 kV(rms) |
70 kV (rms)
|
|
e) |
Max. fault level (1 sec.) |
: |
50 kA |
31.5 kA |
25 kA
|
|
f) |
Minimum creepage distance
|
: |
20000 mm |
3625 mm |
900 mm |
|
g) |
Max Radio Interference level for 0.5MHz to 2.0MHz |
: |
2500 microvolts at 508 kV (rms) |
1000 micro volts at 92 kV |
|
|
h) |
Corona extinction voltage |
: |
508 kV rms min. |
----- |
----- |