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.

Author: Jule Moramar
Country: Mauritania
Language: English (Spanish)
Genre: Life
Published (Last): 13 June 2013
Pages: 67
PDF File Size: 2.25 Mb
ePub File Size: 2.80 Mb
ISBN: 692-1-66616-851-4
Downloads: 79406
Price: Free* [*Free Regsitration Required]
Uploader: Tuzuru

Part 3 Insulation level and dielectric 13 tests IS: 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 ttansformers 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: While interpreting the results, appropriate corrections to the temperature-rise should be made in accordance with The principles of the standard IS: The procedure shall be as given in When the test frequency duration of the test shall be: Part 1 General Jirsi reuision.

IS 11171 (1985): Dry-Type Power Transformers

Thus, for convenience sake, this separate and concise standard has been prepared to set out specific requirements for drytype power transformers. It may be performed on all kinds of dry-type transformers, but is especially applicable to transformers having encapsulated windings.


IS1 marked products are also continuously checked by IS1 for conformity to that standard as a further safeguard. Part 3 Insulation levels and dielectric tests second revision. Part 3 Insulation levels second revision.

Guidance may be obtained from If it is, the degree of protection of the enclosure see NOTE – Insulating materials may be used separately or in a combination providing that, in any application, each system will not be continuously subjected to a temperature in excess of that for which it is suitable when operating under rated conditions.

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

Cast Resin Type Transformer Manufacturer in India Industrial Electrical Corporation

Part 1 General jrst revision. For greater altitudes, see 3. Documents Flashcards Grammar checker. The choice between Lists trnasformers 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.

IS (): Dry-Type Power Transformers

Part 2 Measuring voltage transformers jirst rruision. Part 3 Insulation level and dielectric tests second revision. Part 4 Terminal markings, tappings and connections first rcvition 12 vectorrela- IS: 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.


The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

Part 3 Protective voltage transformers jirst revision. 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.

Enclosed or non-enclosed non-encapsulated-winding dry-type transformers are normally designed for installation indoors in dry locations. Part 4 Terminal markings, tappings and connections Jirst revision. Any site conditions which may either impose restrictions on the cooling air dfy produce high ambient air temperatures should be stated by the ipurchaser.

NOTE – The cooling of a dry-type or forced circulation. Introduction to Power Generation and Transmission. Part 1 General Jirsl revision. While such conditions may have little or no effect transformeds a sealed, dry-type transformer, they may have serious effects on other kinds of dry-type txansfbrmer.

Subscribe US Now