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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If it is, the degree transformmers protection of the enclosure see 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 4 Terminal markings, tappings and connections Jirst revision.

Guidance may be obtained from Afo NOTE – necessary. Geafol encapsulated dry-type transformers are required for indoor installations where safety and. 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 typf.

Thegas in a gas-immersed transformer NOTEthroughout the range of transformer operations. Part 3 Insulation levels second revision.

Part 3 Insulation levels and dielectric tests second revision. Part 3 Insulation 21 levels transformer and for each of levels, lim;ts, and dielectric tests B Part 1 General requirements Jirsl revision. Any site conditions which may either impose restrictions on the cooling air or produce high ambient air temperatures should be stated by the ipurchaser. Part 4 Terminal markings, tappings and connections first rcvition 12 vectorrela- IS: The choice between Lists 1 and 2 should be made by considering the degree of exposure to lightning and switching overvoltages, the type of system neutral earthing and, where applicable, the type of overvoltage protective device.


Furthermore, in the case of a single-phase phase-to-neutral and tested according to 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. Thus, for convenience sake, this separate and concise standard has been prepared to set out specific requirements for drytype power transformers. Part 2 Temperature-rise 14 Jirst rctisioh. 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 Part 38 Transformers first revision.

Enclosed or non-enclosed non-encapsulated-winding dry-type transformers are normally designed for installation indoors in dry locations.

IS (): Dry-Type Power Transformers

Part 1 General Jirsl revision. NOTE consideration The above does not apply to sealed should be given to bushings.

Part 1 Typs requirements first revision. While interpreting the results, appropriate corrections to the temperature-rise should be made in accordance with For greater altitudes, see 3. By agreement between the manufacturer 11117 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. Part 3 Protective current transformers jfirst revision.

This test shall be repeated with another line terminal earthed.

Cast Resin Type Transformer Manufacturer in India Industrial Electrical Corporation

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 2 Measuring current transformers jirst revision.

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They will, however, operate successfully where the humidity is high, provil ded precautions are taken to keep. Furthermore, the electrical and mechanical properties of the insulated winding must not be impaired by the application of the hot-spot temperature permitted for the specrfic insulation system.

The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. For the purpose of determining when constant temperature conditions have been achieved, thermocouples, thermistors, RTDs or thermometers shall be applied to the following surfaces: Part 3 Insulation level and dielectric 13 tests IS: Part 3 Protective voltage transformers jirst revision.

Part 1 Ty;e jrst revision. Letter symbols for use in connection shall be as given in Table 2. Part 1 General jirstrevision. Introduction to Power Generation and Transmission. Part 1 General first revision. It may be performed on all kinds of dry-type transformers, but is especially applicable to transformers having encapsulated windings.

IS 11171: Dry-Type Power Transformers

Documents Flashcards Grammar checker. By means of different voltage ratios or an injected voltage, the rated current is made to flow in the transformer under test.

The principles of the standard IS: 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. Degree of protection provided by enclosures for low voltage switchgear and controlgear.