METHOD FOR DETERMINING EXCESS OF TEMPERATURE OF DRY-TYPE TRANSFORMER WINDINGS OVER AMBIENT TEMPERATURE

摘要

Usage: in electrical engineering and electronics, in particular in the methods used pyteni transformers heating SUMMARY The invention: the method includes establishing thermal conditions in electric mode cold ostogo stroke and short-circuit CO and definition exceeding winding temperature in these modes. Thus holystogo stroke mode is set at a voltage Uxx UH V (1 + 22 and the short circuit current at V (1 +0,78) / S The invention relates to Electrotechnical ..ke and Electronics Engineers, namely to the transformer for heating the test methods . The purpose of the invention - improved accuracy by determining the temperature of dry transformer windings above ambient temperature and economy ma materials under transformers where V (v + o, 6) / (l + 0,200 v, ratio respectively calculated losses in the magneto about water, and the coils and their. cooling surfaces, UH - nominal voltage wives . S, 1H - Determination rated current exceeding the winding temperature during rated operation is carried out by summing: xxG Txx / T + SRC GK3 / GM +0,004 (t-TR3) wherein r, x, f sc respectively calculated in mode idling and short-circuited excess winding temperatures. Increased accuracy is achieved by taking into account not only the losses in themselves windings, but heating due to losses in the magnetic circuit, which in turn leads to improved accuracy of determining their nadehsnosti and resource, and stricter compliance ra.skhoda ma erialoa transformers specify requirements on the thermal regime, i.e. obtaining economies of these materials. 2 yl. SUMMARY OF THE INVENTION consists of the following. Known superposition principle that the temperature rise of the windings of dry type transformers could be determined as the sum of exceedances obtained from two separate sources poter- magnetic core and windings. This principle, however, strictly speaking, can not be applied, if the intensity of the volume-raspre00 J h with CA) CJ