Find the most up-to-date version of IEC at Engineering INTERNATIONAL STANDARD IEC Fifth edition Insulated bushings for alternating voltages above 1 V This English-language version is . Insulated bushings for alternating voltages above 1 V. Reference number. IEC (E). INTERNATIONAL. STANDARD. IEC. Fifth edition.
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Generation, transmission and distribution of electricity — Operation IEC Q5 This standard meets my needs: Please contact 660137 Customer Service Centre see below for further information. Tests on insulating envelopes of ceramic material shall be carried eic in accordance with IEC Reference number IEC When a wet test is made, a dry test is not necessary.
A high level of integrity is needed to ensure that the ief will not fail, or be the initiator of internal flashover in the transformer under test. General definitions and test requirements IEC For bushings with internal bellows, the pressure shall be stated by the supplier. Partly or completely immersed bushings, according to 3. Metallic parts in contact with Insulation class: In such a case the supplier shall demonstrate, by the amount of increase of the arcing distance, that the bushing is adequate.
INTERNATIONAL STANDARD IEC 60137
When, as a substitute for the measurement of partial discharge quantity, the radio interference voltage, expressed in microvolts, is measured by means of a radio interference meter, the method of calibration to be used is that described in IEC NOTE 1 In some applications e.
Reference is made in parenthesis to the relevant subclause. The resistance of the wire and the current shall be adjusted in a such a way as to produce the same losses as the final conductor.
For bushings according to 3. For example, edition numbers 1.
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NOTE 2 By agreement between purchaser and supplier, other temperature ranges may be adopted. For dated references, only ice edition cited applies. The concentration of gas in the air inside the envelope shall be measured twice at an interval equal to or greater than 2 h.
Bushings used as an integral part of apparatus, such as switchgear or transformers, shall meet the thermal requirements for the relevant apparatus.
Before and after the series of type tests, measurements of dielectric dissipation factor and capacitance see 9. A dry test is applicable to indoor, indoor-immersed and completely immersed bushings, according to 3. International, irc and non-governmental organizations liaising with the IEC also participate in this preparation.
Special requirements and tests for transformer bushings in this standard apply also to reactor bushings.
Idc discharge measurements before dielectric tests may be requested for information purpose only, and are not subject to guarantee. For capacitance graded bushings it is assumed that a puncture has occurred if the capacitance measured after the test raises above the capacitance previously measured by about the amount attributable to the capacitance of one layer. For gas-insulated bushings according to 3.
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Missing page numbers correspond to the Frenchlanguage pages. In the case of other insulating materials, the temperature limits shall be stated by the supplier.
Power transformers and reactors IEC If the values are not acceptable, it is permitted to wait for 1 h before repeating the test. In view of its use for partial discharge measurements on transformers, the values for the test tap shall not exceed: Unless otherwise stated, the bushing shall be installed vertically and 06137 flange rigidly fixed to a suitable device.
The test can, however, be omitted if it can be demonstrated, based on the results of comparative tests or calculations, that the thermal stability of the bushing is assured. In circular conductors of diameter D cmthe equivalent cross-section shall take skin effect into account. When the test tap is used for condition monitoring, in service, care should be taken to avoid an open 3.
The dynamic current withstand test is not mentioned in the text, because insufficient experience has so far been collected to ice a realistic test.
Tests on insulators of composite material shall be carried out in accordance with IEC