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 />
1.20.3.8 The fan circuit shall be operated at diff. Temp for group I fans and group II fan from<br />
WTI. The pump circuit shall be also operated from same WTI c<strong>on</strong>tacts at diff. Temp.<br />
1.20.3.9 The c<strong>on</strong>necti<strong>on</strong> shall be bolted type having CB – 30 and CT c<strong>on</strong>nector shall be of<br />
link type it can be shorted for testing or checking circuit.<br />
1.21 CENTRE OF GRAVITY:<br />
1.21.1 The center of gravity of the assembled transformer shall be low and as near the<br />
vertical center <strong>line</strong> as possible. The transformer shall be stable with or without oil.<br />
1.22 ACCESSORIES:<br />
1.22.1 Each transformer shall be provided with the following accessories<br />
(i)<br />
(ii)<br />
Dial Image sensing type thermometers for oil;<br />
(a) For ONAN/ONAF and ONAN/OFAF Transformer<br />
The dial Image sensing type indicting thermometers of robust batten<br />
mounted <strong>on</strong> the side of the transformer at a c<strong>on</strong>venient height to read<br />
the temperature in the hottest part of the oil and fitted with alarm and<br />
trip c<strong>on</strong>tacts and c<strong>on</strong>tacts for switching in and switching out the cooling<br />
system at pre-determined temperatures. ( as per cl. No. 1.20)<br />
(b) For ONAN Transformers<br />
A dial Image sensing type thermometer for indicating oil temperature<br />
fitted with maximum pointer and adjustable alarm and trip c<strong>on</strong>tacts.<br />
On winding hot spot winding temperature detector in LT winding of each<br />
phase as under:<br />
(a) For ONAN/ONAF and ONAF/OFAF Transformer<br />
It shall be indicating type, resp<strong>on</strong>sive to the combinati<strong>on</strong> of top<br />
temperature and winding current, calibrated to follow the hottest spot<br />
temperature of the transformer winding. The winding temperature<br />
detector shall operate a remote alarm and trip at predetermined<br />
independent temperature in the even the hottest spot temperature<br />
approaches a dangerous value.<br />
(b) For ONAN/ONAF and ONAN/OFAF Transformer<br />
In the case of ONAN/ONAF/ONAN/OFAF type transformers it shall<br />
automatically actuate the fans/pumps also.<br />
(ii)<br />
(iv)<br />
One magnetic type oil level gauge with low alarm c<strong>on</strong>tacts and dial showing<br />
minimum maximum and normal oil levels. The gauge shall be readable from<br />
the transformer base level for main tank c<strong>on</strong>servator over and above the<br />
prismatic type oil level gauge.<br />
One oil filling valve (inlet).<br />
Sign and Seal of Bidder Page 23 of 87
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