220-66-kv-xmer-on-line-nifes-r4-sept-08 - Gujarat Electricity Board
220-66-kv-xmer-on-line-nifes-r4-sept-08 - Gujarat Electricity Board
220-66-kv-xmer-on-line-nifes-r4-sept-08 - Gujarat Electricity Board
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GETCO/E/TS – XMER01power/R4 Sept <strong>08</strong><br />
50 MVA 100 MVA<br />
(a) Type 3 phase two winding transformer<br />
(b) Rated capacity 25/35/50 MVA 50/70/100 MVA<br />
(c) Rated voltage <str<strong>on</strong>g>220</str<strong>on</strong>g>/<str<strong>on</strong>g>66</str<strong>on</strong>g> KV<br />
(d) Highest system voltage (kV) 245/72.5 KV<br />
(e) System frequency (Hz) 50 Hz<br />
(f) Type of cooling ONAN/ONAF/OFAF<br />
(g) Vector Group YnYnO (Star/star)<br />
(h) System of grounding Solidly grounded<br />
(i)<br />
Insulati<strong>on</strong> level<br />
(a) 1.2/50 microsec<strong>on</strong>d impulse<br />
withstand (kV Peak)<br />
(b) Power frequency withstand (kV)<br />
(HV LV NEUTRAL)<br />
1050 350 170<br />
460 160 75<br />
(j) % Impedance 15%<br />
(k) Tapping range - 5 to + 15% in equal 16 steps each 1.25%<br />
<strong>on</strong> LV neutral end for LV variati<strong>on</strong>.<br />
(l) Type of tap changers ON LOAD TAP CHANGER (Resistance<br />
transiti<strong>on</strong> type)<br />
(m) C<strong>on</strong>necti<strong>on</strong> YnYnO (Star/star)<br />
(n) Short circuit level for the system KV KVA<br />
<str<strong>on</strong>g>220</str<strong>on</strong>g> 15300<br />
<str<strong>on</strong>g>66</str<strong>on</strong>g> 4573<br />
(o) System Fault level HV: 40 kA 3 sec<br />
(p)<br />
Minimum creepage distance for<br />
bushing (mm)<br />
<str<strong>on</strong>g>220</str<strong>on</strong>g> kV<br />
<str<strong>on</strong>g>66</str<strong>on</strong>g> kV<br />
36 kV<br />
LV: 25 kA 3 sec<br />
6125<br />
1815<br />
900<br />
(q) Service Outdoor Outdoor<br />
(r) Duty C<strong>on</strong>tinuous C<strong>on</strong>tinuous<br />
(s) Overload capacity As per IS:<str<strong>on</strong>g>66</str<strong>on</strong>g>00 – 1972 / IEC354<br />
(t) Partial Discharge level 500 pico-columb 500 pico-columb<br />
2.3.2 The equipment offered shall be suitable for c<strong>on</strong>tinuous operati<strong>on</strong> under the above<br />
c<strong>on</strong>diti<strong>on</strong>s at the full rated capacity.<br />
2.3.4 The power transformers shall in general have c<strong>on</strong>stant ohmic impedance between<br />
HV and LV <strong>on</strong> all taps. However, in case of parallel operati<strong>on</strong> with the existing<br />
transformer,<br />
Sign and Seal of Bidder Page 41 of 87
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