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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For test conditions, 8. Documents Flashcards Grammar checker. The values given above correspond to vertical bushings that are to be tested in 601337 vertical position.
In the case of transformer bushings with the conductor drawn into the central tube, the supplier shall indicate the value of the cross-section, and 6137 material of the conductor which correspond to I r in accordance with 4. The conductor losses corresponding to I r shall be simulated by appropriate means.
The magnitude of the test voltage is given to Table 8. Reference number IEC Alternative methods of leakage detection may be used by agreement between purchaser and supplier. For systems in which overvoltages in excess of this may occur, it is advisable to choose a bushing with a higher U m.
Temperature limits and temperature rise The temperature limits of metal parts in contact with insulating material under normal operating conditions, are as follows: Subject to special agreement between purchaser and supplier, this standard may be applied, in part or as a whole, to the following: The load shall be applied perpendicular to the axis of the bushing at the mid-point of the terminal for 60 s.
The test shall be carried out as follows: Please contact the Customer Service Centre see below for further information. If there is a puncture, the bushing shall be considered to have failed the test. For examples of marking plates, see Figures 1 and 2. Special consideration may be necessary for bushings, one or both ends of which are intended to be immersed in a gaseous medium.
If the calculated temperature exceeds this limit, the ability of the bushing to withstand the standard value of I th shall be demonstrated by a test. The actual temperature during the measurement shall be stated in the test report. Before the test, the bushing shall carry a current which produces the same stable conductor temperature as the rated current at maximum ambient temperature. The time intervals between consecutive applications of the voltage shall be sufficient to avoid effects from the previous applications of voltage.
For bushings with more than one air side terminal, it is generally sufficient to apply the load to one terminal only.
INTERNATIONAL STANDARD IEC 60137
The measurement of partial discharge quantity see 9. The sealing assembly method shall be agreed upon between purchaser and supplier. The tests shall have been carried out on bushings of a design that does not differ from that offered to the purchaser in any way that may improve the features to be checked by a type test.
Level I is normal load and shall be generally applied, unless a purchaser specifies a heavy load of Level II. Tests ic insulators of composite material shall be carried out in accordance with IEC Insulating solids, liquids and gases IEC This edition defines a limit to this temperature and specifies corresponding test conditions.
For bushings according to 3.
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An example of a marking plate is given in Figure 3. The test duration is 60 s, independent of frequency.
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: A IEC Ic 3 — Marking plate for bushings for highest voltage for equipment equal to or less than 52 kV made of ceramic, glass or inorganic materials, resin or combined insulation see Other media shall be agreed between purchaser and supplier.
Attention shall be drawn to any features including tests of the completed apparatus which may affect the design of the bushing see 7. Definitions, principles and rules IEC Fort Hood Sentinel Advertisement. For bushing with internal bellows, the pressure shall be stated by the supplier.
The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields.
When the test tap is used for condition monitoring, in service, care should be taken to avoid an open 3.
All high-voltage tests, in accordance with 8.
Markings for bushings according to Clause 10 are specified in NOTE 1 The daily mean temperature of the immersion ied should be calculated by averaging 24 consecutive hourly readings. The test may be omitted for transformer bushings fitted with a one-piece metal flange, provided the flange has been subjected to a preliminary tightness test, and the bushing has passed the type test in accordance with 8.
For bushings operating in air-insulated ducting, locally high ambient air temperatures have a significant effect on their current rating.
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The 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 significant change from the previous results.
It should be remembered that: If, during the repetition of the test, no flashover or puncture occurs, the bushing shall be considered to have passed the test. 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.
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.