IS 11171 DRY TYPE TRANSFORMERS PDF

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Buy BIS IS (R) SPECIFICATION FOR DRY-TYPE POWER TRANSFORMERS from SAI Global. Since dry-type power transformers are not made for such high voltages and ratings as oil-immersed transformers, a large portion of IS: * serves no purpose. pdf – Download as PDF File .pdf), Text File .txt) or read online. SPECIFICATION FOR DRY-TYPE POWER TRANSFORMERS Transformers Chairman.

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A phase-to-phase pre-stress voltage of transformerx. Part 4 Terminal markings, tappings and connections first rcvition 12 vectorrela- IS: By means of different voltage ratios or an injected voltage, the rated current is made to flow in the transformer under test. Part 38 Transformers first revision. By agreement between the manufacturer and the purchaser at the time of the enquiry, tests may be made with positive polarity, but in this case sudden changes of polarity have to be avoided.

The procedure shall be as given in The full test voltage shall be applied for 60 s between the winding under test and all the remaining windings, core, frame and transformer enclosure, connected to earth.

Dr 1 General first revision. 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: Letter symbols for use in connection shall be as given in Table 2.

Geafol encapsulated dry-type transformers are required for indoor installations where safety and.

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IS 11171: Dry-Type Power Transformers

Temperature tests are made by utilizing the rises obtained tests, one with no-load loss only, and one with load losses only, short-circuit run. Part 2 Measuring voltage transformers jirst rruision.

Part 1 General Jirsl revision. This test shall be repeated with another line terminal earthed.

Afo NOTE – necessary. 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 transformerss temperature rises, A BO, are measured. Part 2 Measuring current transformers jirst revision.

Cast Resin Type Transformer Manufacturer in India Industrial Electrical Corporation

It may be performed on all kinds of dry-type transformers, but is especially applicable to transformers having encapsulated windings. Where the excess temperature exceeds one of the values specified in 3. They will, however, operate successfully where the humidity is transofrmers, provil ded precautions are taken to keep. Part transcormers Insulation levels second revision.

Any site conditions which may either impose restrictions on the iw air or produce high ambient air temperatures should be stated by the ipurchaser. The repetition rate of calibration pulses should be of the order of twice the frequency of the excitation voltage. Part 1 General jrst revision. All other transformers shall be identified by four symbols for each cooling method for which a rating is assigned by the manufacturer.

For greater altitudes, see 3. Part 1 General jirstrevision. Thus, for convenience sake, this separate and concise standard has been prepared to set out specific requirements for drytype power transformers. Part 3 Insulation level and dielectric tests second revision. Part 3 Insulation 21 levels transformer and for each of levels, lim;ts, and dielectric tests B While interpreting the results, appropriate corrections to the temperature-rise should be made in accordance with Documents Flashcards Grammar checker.

Part 3 Insulation level and dielectric 13 tests IS: Part 4 Terminal markings, tappings and connections Jirst revision. Part 3 Protective current transformers jfirst revision. Calibration is carried out as described in Appendix A of IS: Furthermore, in the case of a single-phase phase-to-neutral and tested according to Guidance may be obtained from Part 4 Capacitor voltage transformers Jirst revision.

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NOTE consideration The above does not apply to sealed should be given to bushings. NOTE – 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. 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.

IS 11171 (1985): Dry-Type Power Transformers

Enclosed or non-enclosed non-encapsulated-winding dry-type transformers are normally designed for installation indoors in dry locations. While such conditions may have little or no effect on a sealed, dry-type transformer, they may have serious effects on other kinds of trahsformers txansfbrmer.

Oblique strokes shall be used to separate the group of symbols for different cooling methods for the same piece of equipment.

Part 2 Temperature-rise 14 Jirst rctisioh.

If it is, the degree of protection of the enclosure see Part 1 General requirements first revision. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. Dry-Type Power Transformers advertisement.

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.

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