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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Such tests shall be the subject of previous agreement between purchaser and supplier. Tests on insulating envelopes of ceramic material shall be carried out in accordance with IEC NOTE 4 For bushings where upper and lower insulating envelopes are assembled by clamping force on the central fixing conductor, it is recommended to choose the cantilever test load, taking into account the thermal expansion of the conductor due to the rated current flow.

For test conditions, 8. In the case of other insulating materials, the temperature limits shall be stated by the supplier.

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For bushing terminals and connections, the temperature rises are also given in Table 2. NOTE 2 A satisfactory degree of lagging is obtained by placing 61037 thermometers in oil-filled containers with a volume of approximately 0,5 l.

For bushings of highest voltages for equipment equal to or less than 52 kV, made of ceramic, glass or inorganic materials, resin or composite insulation, see Clause In order to ensure that the external withstand voltages of the bushing ieec sufficient at altitudes exceeding 1 m, the arcing distance normally required shall be increased by a suitable amount.

An appropriate number of thermocouples or other measuring devices shall, as far as possible, be placed along the bushing conductor, central tube and other isc parts, as well as possibly on the flange or other fixing device, so as to determine the hottest spot of the bushing metal parts in contact with insulating material with reasonable accuracy.


For bushings with internal bellows, the pressure shall be stated by the supplier. If the partial discharge at the end of the period is within limits, then the bushing 60173 be accepted.

The angle of mounting of the bushing for the wet power-frequency voltage withstand test and iex switching impulse voltage withstand test may be the subject of special agreement between purchaser and supplier. NOTE Capacitance and dielectric dissipation factor measurements made on site may differ from factory values given on the nameplate.

The skin effect may be determined by considering a depth of penetration d of current derived from the formula given below: Temperature Comparisons Between Transformer Standard and. NOTE 1 The daily mean temperature of the iiec medium should be calculated by averaging 24 consecutive hourly readings. The measurement shall not be made at a voltage exceeding the dry power-frequency withstand voltage.

Power transformers and reactors IEC The point of maximum conductor temperature lies 06137 distance L M from the cooler end. For bushings with I r equal to or greater than 4 A, I th shall always be kA. The external part of the bushing shall be enclosed in an envelope, where necessary.

IEC collaborates closely with the International Organization for Standardization ISO in accordance with conditions determined by agreement between the two organizations. Repetition of a type test is only mandatory when specified in a particular contract. Partial discharge measurements before dielectric tests may be requested for information purpose only, and are not subject to guarantee. The conductor losses corresponding to I r shall be simulated by appropriate means.

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The tank shall be completely filled with an appropriate liquid. Fort Hood Sentinel Advertisement. At the request of the purchaser, the supplier shall furnish any information concerning the minimum clearances to earthed parts in the operating arrangement. Table 10 — Applicability of type tests see 7. The test duration shall be 60 s, independent of frequency. In the case of bushings where one end is immersed, ie details of immersion shall be subject to agreement. 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: This fifth edition cancels and replaces the fourth edition, published inand constitutes a technical revision.


An example of a marking plate is given in Figure 3. The high-voltage connection shall extend in line with the axis of the bushing to a point at least 0,4 L above the top of the bushing.


A pressure of three iev the external maximum operating pressure see 3. If a flashover occurs, the test shall be repeated once only. The bushings shall not be damaged by the tolerated flashover in air when tested in accordance with 8.

Gas-immersed bushings shall be considered to have passed the test, if: The measurement of partial discharge quantity see 9. Q5 This standard meets my needs: Please contact the Customer Service Centre see below for further information.

NOTE 2 If high-resistance coating is applied to parts of the insulating part of an insulator, such parts are considered to be effective insulating surfaces and the distance over them is included in the creepage distance. Enter the exact number of the standard: