IEC 60137 PDF


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 object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. For capacitance graded bushings it is assumed that a puncture has occurred if the capacitance measured after the test rises above the capacitance previously measured by about the amount attributable to the capacitance of one layer.

For bushings with more than one air side terminal, it is generally sufficient to apply the load to one terminal only.


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. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held ic for the way in which they are used or for any misinterpretation by any end user.

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 ic tightness test on each component, completed by a tightness test on each sealing assembly.

Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work.

Documents Flashcards Grammar checker. Liquid-containing bushings shall remain empty and shall have an opening for free gas circulation within the envelope. The puncture strength and the flashover ice in the immersion medium of eic bushing are not affected by altitude. Before and after the series of type tests, measurements of dielectric dissipation factor and capacitance see 9.


It is recommended to make reference measurements at installation.

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The insulator shall be completely filled with an appropriate medium. Q2 Please tell us in what capacity ies you bought the standard tick all that apply. On-line information is also available on recently issued publications, withdrawn and replaced publications, as well as corrigenda. Bushings with a conductor drawn into the central tube shall be assembled with an appropriate conductor, the cross-section of which shall conform with I r. Voltage records shall be made for each impulse.

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.

Consideration should be given to the operating conditions of completely immersed bushings and bushings operating in air-insulated ducting.

To simulate service conditions, the bushing shall be mounted on an earthed plane, radially extended from the axis of the bushing at least 0,4 L in every direction, L being the dry arcing distance of the bushing.

Owing to the limitations of puncture strength and flashover voltage in the immersion medium, it may not always be possible to check the adequacy of the increased arcing distance by actual tests at any altitude lower than that of operation.

Limiting values for temperature rise and dielectric dissipation factor have therefore been introduced. NOTE 2 By agreement between purchaser and supplier, other temperature ranges may be adopted. If the partial discharge at the end of the period is within limits, then the bushing shall be accepted.

The test shall be continued until the temperature rise is sensibly constant. Special consideration may be necessary for bushings, one or both ends of which idc intended to be immersed in a gaseous medium. This temperature shall be measured by means of thermometers, immersed in oil about 3 cm below the surface, and about 30 cm from the bushing.

The skin effect may be determined by considering a depth of penetration d of current derived from the formula given below: The actual temperature during the measurement shall be stated in the test report. The tank shall be completely filled with an appropriate liquid.


This standard is applicable to bushings made and sold separately. If a flashover occurs, the test shall be repeated once only. Partial discharge measurements before dielectric tests may be requested for information purpose only, and are not subject to guarantee.

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The gas shall be maintained at a temperature agreed upon between purchaser and supplier. Other values of test tap capacitance to earth may be agreed between purchaser and supplier. The ends of the bushings, which are intended for immersion in a gaseous insulating medium other than air at atmospheric pressure, shall be appropriately immersed in insulating gas at minimum pressure as defined in 3.

NOTE 1 In some applications e. Power transformers and reactors IEC 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.

Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. For dated references, only the 61037 cited applies. Temperature limits and temperature rise The temperature limits of metal parts in contact with insulating material under normal operating conditions, are as follows: The magnitude of the test voltage is given in Tables 7 or 9. The temperature of the oil or gas shall be measured by means of thermometers placed at a distance of 30 cm from the bushing and, in the case of oil, 3 cm below the surface of the oil.

For gas-immersed bushings, the tank shall be filled with gas at maximum operating pressure at ambient temperature. For transformer bushings, iiec th shall be 2 s, unless otherwise stated, 6013 reference to IEC Definitions, principles and rules IEC