Source: https://promovare-site.info/is-11171-dry-type-transformers-31/
Timestamp: 2020-04-09 01:46:46
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Author: Mikakora Nikogul
ISBN: 803-2-36632-502-1
IS 11171: Dry-Type Power Transformers
By means of different voltage ratios or an injected voltage, the rated current is made to flow in the transformer under test. Details of conditions, under which a licence for the use of the IS1 Certification Mark may be granted to manufacturers or processors, may be obtained from the Indian Standards Institution.
If it is, the degree of protection of the enclosure see Furthermore, in the case of a single-phase phase-to-neutral and tested according to Part 1 General jirstrevision. Calibration is carried out as described in Appendix A of IS: Part 3 Insulation 21 levels transformer and for each of levels, lim;ts, and dielectric tests B Information on the gas, if required, to fill the enclosure; g h 3 k 4 Method Indoor of cooling; or outdoor installation; Rated power in LVA ; Rated voltage for each winding ; State whether tappings are required, and circuit tap-changers or links are required; 20 if SO, whether off- 4 Highest voltage for equipment, U, for each winding ; P Insulation level, that is, values of test voltage at power frequency and, if required, lightning impulse ,for which each winding is to be designed [see IS: Part 4 Capacitor voltage transformers Jirst revision.
Standard conveys the assurance that they have been produced to comply witb the requirements of that standard under a well-defined system of inspection, testing and and supervised by IS1 and operated by the quality control which is devised producer.
Part 1 General Jirsl revision. Part 3 Insulation levels and dielectric tests second revision. Part 2 Temperature-rise 14 Jirst rctisioh. IS1 marked products are also continuously checked by IS1 for conformity to that standard as a further safeguard. Part 1 General jrst revision.
In addition to high or low ambient temperature and high altitude, other environment conditions which may affect design and application can exist and are not necessarily covered by this standard. Part 3 Insulation level and dielectric 13 tests IS: The short-circuit run with rated current flowing in one winding and the other winding short-circuited is started immediately following the noload run, and continued until steady-state conditions are obtained when the individual winding temperature rises, A BO, are measured.
Part 3 Insulation level and dielectric tests second revision. Geafol encapsulated dry-type transformers are required for indoor installations where safety and. Part 3 Protective transtormers transformers jfirst revision.
It may be performed on all kinds of dry-type transformers, but is especially applicable to transformers having encapsulated windings. The provisions out by mutual 18 ; of acoustic sound level 19 ; and test Part 2 Measuring current transformers jirst revision.
While interpreting the results, appropriate corrections to the temperature-rise should be made in accordance with These partial discharges lead to changes in the current waveform, whilst the voltage waveform varies only slightly or not at all.
NOTE- When a trsnsformer has windings of transformwrs insulation system temt peratures class of insulationonly one reference temperature is, the one relating to the winding having the higher inrulation NOTE tpye In view of the fact that the transtormers will be operated at two different taps the winding temperature-rise of two transformer may be slightly different.
Part 3 Protective voltage transformers jirst revision. Where the excess temperature exceeds one of the values specified in 3. The test sequence per line terminal shall be one calibration impulse at a voltage between 50 and 75 percent of the full voltage followed by three impulses at full voltage. These ratings shall be such that the transformer can deliver its rated current under steady loading conditions without exceeding the limits of temperature-rise specified in Section 3, assuming that the applied voltage is equal to the rated voltage and that the supply is at rated frequency.
Thegas in a gas-immersed transformer NOTEthroughout the range of transformer operations. Part 4 Terminal markings, tappings and connections first rcvition 12 vectorrela- IS: Part 1 Transfformers requirements Jirsl revision.