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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Power transformers and reactors IEC The transformer manufacturer should stipulate such requirements in the bushing ordering information see 6.
In the case of transformer bushings with the conductor drawn into the central tube, the supplier shall 600137 the value of the cross-section, and the material of the conductor which correspond to I r in accordance with 4. The measurement of partial discharge quantity see 9.
Use of the referenced publications is indispensable for the correct application of this publication. Partly or completely immersed bushings, according to 3.
INTERNATIONAL STANDARD IEC 60137
This edition includes the following significant technical changes with respect to the previous edition: Other components should be tested to their appropriate standards. The time intervals between consecutive applications of the voltage shall be sufficient to avoid effects from the previous applications of voltage.
Before commencing dielectric tests, the insulator shall be clean and dry and in thermal equilibrium with the ambient air.
Q2 Please tell us in what capacity ies you bought the standard tick all that apply. If the information on transformer test level is not provided by the purchaser, the test level for the bushing shall be in accordance with Tables 7 or 9.
The skin effect may be determined by considering a depth of penetration d of current derived from the formula given below: 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. Any other angle of mounting shall be subject to agreement 601377 purchaser and supplier.
The committee has decided that the contents of this publication will remain unchanged until For bushings with I r equal to or greater than 4 A, I th shall always be kA. The temperature of the oil or ie 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.
Dry power-frequency withstand test voltage levels for transformers bushings should be increased according to 9. Gas-insulated bushings shall be at ambient temperature at the beginning of the test.
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It is permissible, after changing 600137, to apply some impulses of minor amplitude before the application of the test impulses.
A bushing operating at any other angle is considered a tilted bushing see 6. For transformer bushings, irc th shall be 2 s, unless otherwise stated, with reference to 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.
Tables 11 and 13 show the applicability of the tests to the various types of bushings. Liquid-filled and liquid-insulated bushings, according to 3.
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The conductor losses corresponding to I r shall be simulated by appropriate means. If a vertical bushing is to be tested horizontally, then the test load can be reduced in the same manner. NOTE 2 This tap can also be used for the measurement of dissipation factor, capacitance and partial discharge.
It is not necessary to adjust the radial thickness of insulation or the clearance of the immersed end. NOTE 2 By agreement between purchaser and supplier, other temperature ranges may be adopted.
The external part of 60317 bushing shall be enclosed in an envelope, where necessary.
NOTE 1 The daily mean temperature of the immersion medium should be calculated by averaging 24 consecutive hourly readings. Consolidated editions The IEC is now publishing consolidated versions of its publications.
Insulating solids, liquids and gases IEC 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. Normally, GIS and transformer bushings are tested in the vertical position, with the flange earthed or held near to earth potential.