11 KV AND 33 KV VACCUM CIRCUIT BREAKER
This specification covers design, manufacturing, testing at manufactures work, supply of 11 KV and 33KV Vacuum Circuit Breakers complete with all accessories require for their satisfactory operation for the subtransmission system. The breakers shall be used for transformer protection for feeder control in the system.
|
S.No |
Particulars |
33KV |
11 KV |
|
1 |
Number of poles |
3 nos |
3 nos |
|
2 |
Frequency |
50 cycles |
50 cycles |
|
3 |
Nominal system voltage |
33 KV |
11 KV |
|
4 |
Highest system voltage |
36 kv |
12 kv |
|
5 |
Interrupting capacity at nominal system voltage |
1500 mva |
1500 mva |
|
6 |
Rated continuous current |
1250 amp |
1250 amp |
|
7 |
Short time current rating for 3 secs |
25 KA |
25 KA |
|
8 |
Basic insulation level |
170 KV |
75 KV |
|
9 |
Power frequency with stand voltage for one minute |
70 KV |
28 KV |
|
10 |
Total break time for any current upto the rated breaking current |
5 CYCLE (max) |
5 CYCLE (max) |
|
11 |
Control circuit voltage |
30 volt D.C. |
30 volt D.C. |
|
12 |
Operation duty for gang operation |
0-0.3 SEC |
0-0.3 SEC |
|
13 |
The VCBs shall be suitable for one reclsing followed by one delayed reclosing and lock out |
|
|
|
14 |
Between phases |
430 mm |
280 mm |
|
15 |
Between live parts and ground |
3700 mm |
2750 mm |
|
16 |
Creepage distance |
900 mm |
300 mm |