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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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 iwc are used or for any misinterpretation by any end user. The time intervals between consecutive applications of the voltage shall be sufficient to avoid effects from the previous application of voltage.
The level shall be not lower than the values shown in Tables 7 or 9.
Partly or completely immersed bushings, according to 3. For bushings where this is not possible, alternative methods may be agreed between purchaser and supplier. NOTE 4 For bushings where upper and lower insulating envelopes are assembled by clamping force on the central fixing conductor, it 60317 recommended to choose the cantilever test load, taking into account the thermal expansion of the conductor due to the rated current flow.
The bushings shall not be damaged by the tolerated flashover in air when tested in accordance with 8. For other bushings, tests to check dielectric, thermal and mechanical properties of bushings comprise the following tests.
The measurement of partial discharge quantity see 9. The puncture strength and the flashover voltage in the immersion medium of a bushing are not affected by altitude. Before commencing dielectric tests, the insulator shall be clean and dry and in thermal equilibrium with the ambient air.
In circular conductors of diameter D cmthe equivalent cross-section shall take skin effect into account. 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 a tightness test on each component, completed by a tightness test on each sealing assembly.
The load shall be in the direction which will cause the highest stress at the critical parts of the bushing in normal operation. The above series of currents are in accordance with the values indicated in IEC Subject to agreement between manufacturer and purchaser, the standard oil temperature rise of 60 K may be reduced to reflect the real transformer top oil temperature. For bushings according to 3. 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.
Extension of the range of application of lightning impulse and switching impulse tests, included in IECis not considered technically or commercially justified for bushing routine or type tests. The test shall be continued until the temperature rise is sensibly constant.
The external part of the bushing shall be enclosed in an envelope, where necessary. The bushing shall be assembled as far as necessary for the test, but there shall not be any internal gas pressure.
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International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. If the frequency at the test differs from the rated frequency, the current may be adjusted to achieve equivalent losses.
For undated references, the latest edition of the referenced document including any amendments applies. If during the repetition of the test no flashover or puncture occurs, the bushing shall be considered to have passed iex test.
Q2 Please tell us in what capacity ies you bought the standard tick all that apply. Ifc skin effect may be determined by considering a depth of penetration d of current derived from the formula given below: Subject to special agreement between purchaser and supplier, this standard may be applied, in part or as a whole, to the following: Consolidated editions The IEC is now publishing consolidated versions of its publications.
It is advisable to carry out a preliminary tightness test on such components as is considered useful. To make sure that we continue to meet your needs, your feedback is essential. For examples of marking plates, see Figures 1 and 2. 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: Q5 This standard meets my needs: Gas-filled, gas-insulated and gas-impregnated bushings, according to 3.
For bushings with more than one air side terminal, it is generally sufficient to apply the load to one terminal only. This fifth edition cancels and replaces the fourth edition, published inand constitutes a technical revision.
Alternative methods of leakage detection may be used by agreement between purchaser and supplier. This change is in line with other equipment standards.
INTERNATIONAL STANDARD IEC 60137
Missing page numbers correspond to the Frenchlanguage pages. The bushing shall be considered to have passed the test if there is no 06137 evidence of damage and if it has withstood a repetition of all routine tests without significant change from the previous results. NOTE Capacitance and dielectric dissipation factor measurements made on site may differ from factory values given on the nameplate. For test conditions, 8.