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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It should be remembered that: Voltage records shall be made for each impulse. Dry isc withstand test voltage levels for transformers bushings should be increased according to 9. Bushings which are a part of an apparatus and which cannot be tested according to this standard, should be tested with the apparatus of which they form part.
Ability to withstand short circuit IEC Partly or completely immersed bushings, according to 3. NOTE For gaskets in contact with metallic parts, special attention should be paid to the ability of the material to withstand the temperature rise.
INTERNATIONAL STANDARD IEC 60137
If the frequency at the test differs from the rated frequency, the current may be adjusted to achieve equivalent losses. Test taps and voltage taps shall be either earthed or held near earth potential. The end for immersion shall be mounted on ic tank as for normal operation at ambient temperature.
The standard values of insulation level of a bushing having U m equal to or greater than kV shall be chosen from values given in Table 8. The actual temperature during the measurement shall be stated in the test report. A high level of integrity is needed to ensure that the bushing will not fail, or be the initiator of internal flashover in the transformer under test. NOTE 1 In some applications e. Limiting values for temperature rise and dielectric dissipation factor have therefore been introduced.
NOTE 2 This tap can also be used for the measurement of dissipation factor, capacitance and partial discharge.
The concentration of gas in the air inside the envelope shall be measured twice at an interval equal to or greater than 2 h. In circular conductors of diameter D cmthe equivalent cross-section shall take skin effect into account.
For bushings where this is not possible, 61037 methods may be agreed between purchaser and supplier. Markings for bushings according to Clause 10 are specified in The sealing assembly method shall be agreed upon between purchaser and kec.
It is advisable to carry out a preliminary tightness test on such components as is considered useful. If there is a puncture, the bushing shall be considered to have failed the test. Before the test, the bushing shall carry a current which produces the same stable conductor temperature as the rated current at maximum ambient temperature. Insulated bushings, of IEC technical committee The magnitude of the test voltage is given in Tables 7 or 9.
For bushing with internal bellows, the pressure shall be stated by the supplier. NOTE 2 Attention is drawn to special requirements for transformer bushings concerning dry power-frequency withstand voltage see iecc.
The point of maximum conductor temperature lies at distance L M from the cooler end. NOTE 2 The bushing may be of the types as prescribed in 3. The bushings shall not be damaged by the tolerated flashover in air when tested in accordance with 8.
INTERNATIONAL STANDARD IEC
The external part of the bushing shall be enclosed in an envelope, where necessary. Enter the exact number of the standard: Information on the subjects under consideration and work in progress undertaken by the technical committee which has prepared this publication, lec well as the list of publications issued, is also available from the following: If the partial discharge at the end of the period is within limits, then the bushing shall be accepted.
If a flashover occurs the test shall be repeated once only. 600137 bushing shall be considered to have passed the test if there is no visual evidence of damage and if it has withstood a repetition of all routine tests without kec change from the previous results.
Repetition of a type test is only mandatory when specified in a 6037 contract. All high-voltage tests, in accordance with 8. 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.
The test shall be continued until the temperature rise is sensibly constant. Insulation levels, dielectric tests and external clearances in air IEC NOTE 2 A resin-bonded paper bushing can be provided with an insulating envelope, in which case the intervening space can be filled with an insulating liquid or another insulating medium.