Telephone: +41 22 02 11 Telefax: +41 22 03 00 E-mail: [email protected] Web: INTERNATIONAL. STANDARD. IEC. Third edition. This part of IEC identifies the requirements for power transformers to sustain without damage the effects of overcurrents originated by external short. IEC. Second edition. This English-language version is As from 1 January all IEC publications are issued with a designation in the.
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To make sure that we continue to meet your needs, your feedback is essential. A report containing the result of the 60706-5 tests shall be available at the beginning of shortcircuit tests.
INTERNATIONAL STANDARD IEC 60076-5
660076-5 Safety of power transformers, power supplies, reactors and similar products Part For categories I and II three-phase transformers, the total number of tests shall be nine, i. Safety of power transformers, power suply units and similar Part 2: For transformers of category III, an agreement between the manufacturer and the purchaser is always needed with regard to the number of tests and the position of the tap-changer.
Guidance for the identification of a similar transformer is given in annex A. When a short-circuit test is selected, it shall be regarded as a special test, see 3. During the tests, winding temperature may increase owing to the circulation of the shortcircuit current.
With this test arrangement, it might be convenient to mutually connect the corresponding terminals of the phases not submitted to test in order to better control their voltage, provided that this jec feasible and circuitry correct. The two windings can be supplied either from the same power source or from two separate and synchronized power sources.
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Ability to withstand short circuit YEAR. The oscillograph can be set to record the phase currents. Medical electrical equipment Part 1: Information on the subjects under consideration and work in progress undertaken by the technical committee which has prepared 6006-5 publication, as well as the list of publications issued, is also available from the following: Please contact the Customer Service Centre see below for further information.
NOTE 2 Generally, the short-circuit reactance variation should show a tendency to diminish in the course of the tests. If any of the above conditions are not met, the unit shall be dismantled, as necessary, to establish the cause of the deviation. This increase in current should be taken into consideration when calculating the temperature rise of the zigzag winding. Annex A is for information only.
When available testing facilities require the supply to be connected to the inner winding, special precautions shall be taken, for example, pre-magnetization of the core, to prevent the inrush of magnetizing current. NOTE For auto-transformers and for transformers with short-circuit current exceeding 25 times the rated current, a short-circuit 60076–5 duration below 2 s may be adopted by agreement 6006-5 the manufacturer and the purchaser.
The coefficients are based on the following material properties: Particular requirements and tests for isolating transformers and power supply units incorporating isolating transformers. However, in order to simulate ic closely as possible the effects of repetitive short-circuit events likely to occur in service, to allow a better monitoring of the behaviour of the unit under test and to permit a meaningful judgement in connection with possible variations of the measured short-circuit impedance, it is recommended that the number of tests is as follows: NOTE 2 When insulation systems other than thermal class A are employed isc oil-immersed transformers, different maximum values of temperature may be allowed by agreement between the manufacturer and the purchaser.
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NOTE 1 Additional means of detection may be used to obtain information and improve the evaluation of the test event, such as recording of the current between the tank insulated and earth, recordings of noise and vibrations, recordings of oil pressure variations occurring at different locations inside the tank during short-circuit current flow, etc.
However, the on-load tap-changer is not required to be capable of switching the short-circuit current. The test shall be carried out in accordance with the requirements ieec 4.
Scame solutions for charging systems. Particular requirements for separating transformers for general use.
Particular requirements and tests for auto transformers and power supply units incorporating auto transformers IEC Safety of power transformers, power supply units and similar Part For categories I and II single-phase transformers, the number of tests shall be three.
Hence, if there is a high variation of reactance exceeding the prescribed limits, based on measurements made immediately after the test, it may be prudent to repeat the measurements after an interval in order to check whether the variation is maintained. General requirements for basic safety and essential performance. However, parties to agreements based on this part of IEC are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below.