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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The test may be omitted for transformer bushings fitted with a one-piece metal flange, provided the flange has been subjected to a preliminary tightness test, and the bushing has passed the type test in accordance with 8.

Other media shall be agreed between purchaser and supplier. The time intervals between consecutive applications of the voltage shall be sufficient to avoid effects from the previous application of voltage. Such tests shall be the subject of previous agreement between purchaser and supplier. Insulated bushings, of IEC technical committee Temperature Comparisons Between Transformer Standard and.

This standard is applicable to bushings, as defined in Clause 3, intended for use in electrical apparatus, machinery, transformers, switchgear and installations for three-phase alternating current systems, having highest voltage for equipment above 1 V and power frequencies of 15 Hz up to and including 60 Hz.

For gas-insulated bushings according to 3. Metallic parts in contact with Insulation class: Bushings used as an integral part of apparatus, such as switchgear or transformers, shall meet the thermal requirements for the relevant apparatus. The ends of the bushings, which are intended for immersion 60173 a gaseous insulating medium other than air at atmospheric uec, shall be appropriately immersed in insulating gas at minimum pressure as defined in 3.

For bushings operating in air-insulated ducting, locally high ambient air temperatures have a significant effect on their current rating. For gas-insulated bushings, intended to form an integral part of gas-insulated equipment, and of which assembly is intended to be achieved on site, it is permitted to replace the tightness test on the assembled bushing by ifc tightness test on each component, completed by a tightness test on each sealing assembly.

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Missing page numbers correspond to the Frenchlanguage pages. The measurement of partial discharge quantity see 9. NOTE 2 Attention is drawn to special requirements for transformer bushings concerning dry power-frequency withstand voltage see 9.

The test duration is 60 s, independent of frequency. Partial discharge measurements before dielectric tests may be requested for information purpose only, and are not subject to guarantee.

The load shall be in the direction which will cause the highest stress at the critical parts of the bushing in normal operation. Before commencing dielectric tests, the insulator shall be clean and dry and in thermal equilibrium with the ambient air.

Enter the exact number of the standard: As the dielectric routine tests see 7. The end for immersion shall be mounted on a tank as for normal operation at ambient temperature. It is recommended to make reference measurements at installation.

Where there is no evidence of the above, the test is considered satisfactory even though the fittings may have been stressed beyond their yield point. The test duration shall be 60 s, independent of frequency.

INTERNATIONAL STANDARD IEC 60137

The test shall not be started until thermal equilibrium between the oil and the bushing has been reached. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user.

Liquid-filled and liquid-insulated bushings, according to 3. It is advisable to carry out a preliminary tightness test on components for which the test is considered useful. This edition includes the following significant technical changes with respect to the previous edition: The dynamic current withstand test is not mentioned in the text, because insufficient experience has so far been collected to design a realistic test.

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The test shall be a type test only in the case of bushings with gaskets of which the final placing is not carried out by the supplier, for example the top cap gasket of draw-through conductor transformer bushings.

Q2 Please tell kec in what capacity ies you bought the standard tick all that apply. The time intervals between consecutive applications of the voltage shall be sufficient to avoid effects from the previous applications of voltage. In particular, ie the case of bushings intended for use on gasinsulated switchgear and transformers, tests may be required with simulation of adjacent metal parts on the GIS or transformer side. If artificial pollution tests are required, they shall be performed in accordance with IEC Documents Flashcards Grammar checker.

Tests — Test Q: For bushing terminals and connections, the temperature rises are also given in Table 2. NOTE 2 This tap can also be used for the measurement of dissipation factor, capacitance and partial discharge. Tests on insulating envelopes of ceramic material shall be carried out in accordance with IEC 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.

For bushings with more than one air side terminal, it is generally sufficient to apply the load to one terminal only. For bushings where this is not possible, alternative methods may be agreed between purchaser and supplier.