IS 11171 DRY TYPE TRANSFORMERS PDF

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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The principles of the standard 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.

Cast Resin Type Transformer Manufacturer in India Industrial Electrical Corporation

Part 3 Insulation level and dielectric tests second revision. Dry-Type Power Transformers advertisement. When the test frequency duration of the test shall be: Part 2 Temperature-rise 14 Jirst rctisioh.

Part 1 General first revision. Part 1 General Jirsi reuision. Part 1 General jrst 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 4 Terminal markings, tappings and connections Jirst revision. Guidance may be obtained from They will, however, operate successfully where the humidity is high, drj ded precautions are taken transformerrs keep.

For the purpose of determining when constant temperature conditions have been achieved, thermocouples, thermistors, RTDs or thermometers shall be applied to the following surfaces: By means of different voltage ratios or an injected voltage, the rated typr is made to flow in the transformer under test. Part 38 Transformers first revision. Letter symbols for use in connection shall be as given in Table 2.

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Temperature tests are made by si the rises obtained tests, one with no-load loss only, and one with load losses only, short-circuit run. Part 3 Insulation 21 levels transformer and for each of levels, lim;ts, and dielectric tests B Where the excess temperature exceeds one of the values specified in 3.

IS 11171: Dry-Type Power Transformers

Degree of protection provided by enclosures for low voltage switchgear and controlgear. 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: In addition to high or low ambient temperature and high altitude, other environment conditions which may affect design and application can exist gype are not necessarily covered by this standard.

Part 3 Insulation levels second revision. Part 2 Measuring current transformers jirst revision. Part 3 Protective current transformers jfirst revision. This test shall be repeated with another line terminal earthed. Enclosed or non-enclosed non-encapsulated-winding dry-type transformers are normally designed for installation indoors in dry locations.

NOTE – The cooling of a dry-type or forced circulation. 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. Small Primary Substation Transformer. While interpreting the results, appropriate corrections to the temperature-rise should be made in accordance with All typpe transformers shall be identified by four symbols for each cooling method tupe which a rating is assigned by the manufacturer.

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

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NOTE – Insulating materials may be used separately or in a combination providing that, in transformegs application, each system will not be continuously subjected to a temperature 111771 excess of that for which it is suitable when operating under rated conditions.

While such conditions may have little or no effect on a sealed, dry-type transformer, they may have serious effects on other kinds of dry-type txansfbrmer.

IS (): Dry-Type Power Transformers

Part 1 General Jirsl revision. Cl Wave-shape of supply uoltage – A supply voltage shape is approximately sinusoidal. 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. Part 3 Insulation levels and dielectric tests second revision. NOTE- When a trsnsformer has windings of different insulation system temt peratures class of insulationonly one reference temperature is, the one relating to the winding having the higher inrulation 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.

Furthermore, in the case of a single-phase phase-to-neutral and tested according to 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.