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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IEC shall not be held responsible for identifying any or all such patent rights. Partial discharge measurements before dielectric tests may be requested for information purpose only, and are not subject 600137 guarantee.

NOTE 2 By isc between purchaser and supplier, other temperature ranges kec be adopted. The test shall be carried out as follows: The puncture strength and the flashover voltage in the immersion medium of a bushing are not affected by altitude. For bushings with I r equal to or greater than 4 A, I th shall always be kA.

In order to ensure that the external withstand voltages of the bushing are sufficient at altitudes exceeding 1 m, the arcing distance normally required shall be increased by a suitable amount. The load shall be oec the direction which will cause the highest stress at the critical parts of the bushing in normal operation. The wet test is applicable to all outdoor bushings according to 3.

If the actual atmospheric conditions deviate from the values given in IECcorrection shall be made as given in Table 4. During the test, the dielectric dissipation factor shall be measured frequently and the ambient air temperature shall be recorded at each measurement. The tank shall be completely filled with idc appropriate liquid. Definitions, principles and rules IEC On-line information is also available on recently issued publications, withdrawn and replaced publications, as well as corrigenda.

Gas-insulated and gas-impregnated bushings have become a mature technology, for use in gas insulated switchgear. Enter the exact number of the standard: If artificial pollution tests are required, they shall be performed in accordance with IEC Choice of test criteria IEC For bushings with internal bellows, the pressure shall be stated by the supplier.

The test shall not be started until thermal equilibrium between the oil and the bushing has been reached. 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. NOTE 2 This tap can also be used for the measurement of dissipation factor, capacitance and partial discharge.

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The test shall be a type test only in the case of bushings iiec 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.

The bushing shall be enclosed in an envelope, for example a plastic bag.

INTERNATIONAL STANDARD IEC 60137

An example of a marking plate is given in Figure 3. When, as a substitute for the measurement of partial discharge quantity, the radio 600137 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 For bushings of U m equal to or less than kV, markings indicated g are sufficient.

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, 660137 highest voltage for equipment above 1 V and power frequencies of 15 Hz up to and including 60 Hz.

The magnitude of the test voltage is given in Tables 7 or 9. Before commencing dielectric tests, the insulator shall be clean and dry and in thermal equilibrium with the ambient air. Metallic parts in contact with Insulation class: Liquid-filled and liquid-insulated bushings, according to 3.

The bushings shall not be damaged by the tolerated flashover in air when tested in irc with 8. These conditions are assumed to be fulfilled if the temperature decrease from the bushing termination to a point at 0,5 m distance along the connection does not exceed 2 K. Test taps and voltage taps shall be either earthed or held near earth potential. The time intervals between consecutive applications of the voltage shall be sufficient to avoid effects from the previous application of voltage.

The gas shall be maintained at a temperature agreed upon between purchaser and supplier. 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. For wall bushings the test load shall be applied to each end of the bushing separately.

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For gas-insulated bushings according to 3. The measurement shall not be made at a voltage exceeding the dry power-frequency withstand voltage.

If a tilted or horizontal bushing is to be tested vertically, then an equivalent force should be 6013 to achieve the bending moment at the flange, caused by the weight of the bushing in its operating position.

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The concentration of gas in the air inside the envelope shall be measured twice at an interval equal to or greater than 2 h. Markings for bushings according to Clause 10 are specified in Information on the subjects under consideration and work in progress undertaken by the technical committee which has prepared this publication, as well as the list of publications issued, is also available from the following: If a flashover occurs, the test shall be repeated once only.

The means of attachment flange or fixing device to the partition forms part of the bushing [IEVmodified] NOTE 1 The conductor may form an integral part of the bushing or be drawn into the central tube of the bushing.

This change is in line with other equipment standards. For bushing terminals and connections, the temperature rises are also given in Table 2. Isc dry switching impulse withstand test for transformer bushings of U m less than kV switching impulse may be applied subject to agreement.

To make sure that we continue to meet your needs, your feedback is essential. Such tests shall be the subject of previous agreement between purchaser and supplier. When the transformer oil is in communication with the bushing central tube, the oil level shall not exceed one-third of the height of the external part.

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