3, the cooling means of dry type transformer
Cooling means divides dry type transformer to cool for natural air (AN) and force air to cool (AF) . When natural air is cold, transformer can move for a long time below nominal capacity continuously. Force when wind is cold, transformer output capacity can rise 50% . Apply to intermittent cross bear to move, or lash-up accident crosses bear to move; Because cross the load when bear loss and impedance voltage amplitude are bigger, be in blame economy to run state, reason should not make its are in cross bear for long to move continuously.
4, the overload ability of dry type transformer
The laden circumstance before the overload ability of dry type transformer and environmental temperature, overload (initial load) , the insulation of transformer comes loose hot circumstance and calorific time constant about, if have need, can ask for to the manufacturer dry change cross bear curve.
How to use its overload capacity? The author puts forward to offerred reference at 2 o'clock:
(1) choice computation can reduce appropriately when transformer capacity: Mature certain steel rolling, solder the possibility that bear has pounded when waiting for equipment weak point- - the stronger overload ability of transformer of dry type of make the most of and reduce transformer size; To the place of certain inhomogenous bear, if offer entertainment of the nightly illume residential area that give priority to, culture,set inflict and the bazaar that mediate illume is given priority to by day for nothing to wait, can make full use of its overload ability, reduce transformer size appropriately, make its advocate run time is in be fully loaded with or short when overload.
(2) can decrease reserve capacity or stage number: In certain room, to transformer reserve coefficient demand is higher, make the transformer size that project choosing matchs large, stage number is much. And use fight the overload ability that change, in the consideration its reserve can give when the capacity compress; In reserve certainly the Yi Ke when the stage is counted decreases. When transformer has been in carry to go, must notice to monitor its to run temperature: If temperature rises,amount to 155 ℃ (have call the police give out) should adopt namely decrease carry measure () of subtractive and certain less important bear, in order to ensure the safe power supply of pair of main negative charge.
5, means of line of low extrude of dry type transformer and its interface cooperate
Because dry type transformer does not have oil, also wait for a problem without fire, explosion, pollution, reason is electric standard, regulations all do not ask park of dry type transformer is alone inside the room. Loss and noise fell new standard, more transformer and low-pressure screen park are same distribution is indoor created a condition.
Current, insulation of our country colophony does type transformer to produce per year a quantity to already amounted to 10000MVA, become one of amount of produce and sale of dry type transformer is the largest states on the world. As low a confusion of voices (distribution transformer noise already was controlled under 2500kVA in 50dB less than) , energy-saving (the promotion application that holds loss to reduce the SC(B)9 series that amounts to 25%) for nothing, make our country dry the function index of type transformer reachs his to make a technology already reached world advanced level.
Previous 1 23 4 Next 