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.
|Published (Last):||17 December 2017|
|PDF File Size:||10.7 Mb|
|ePub File Size:||11.35 Mb|
|Price:||Free* [*Free Regsitration Required]|
Particular requirements for separating transformers for general use. However, the lightning impulse test is not required at this stage. If a lightning impulse test is specified, it shall be performed at this stage.
Please assess the standard in the following categories, using the numbers: Large power transformers sometimes cannot be tested according to this standard due, for example, to testing limitations. In order to consider the transformer as having passed the short-circuit test, the following conditions shall be fulfilled: Nevertheless, if agreed between the purchaser and the manufacturer, it is permissible to test 60 Hz transformers with a 50 Hz power supply and 50 Hz transformers with a 60 Hz power supply provided that the prescribed test current values, as required in 4.
Search results for “”
NOTE 3 If, for star-connected windings, the power supply is insufficient for the single-phase testing described above and the neutral is available, the manufacturer and the purchaser may agree upon the use of single-phase power supply between line terminal and the neutral, provided that neutral is capable of uec the relevant current. For delta-connected windings, the single-phase supply is provided between two corners of the delta and the voltage during the test ief to be the same as the voltage between phases during a three-phase test.
The coefficients are based on the following material properties: For example, edition numbers 1. Medical electrical equipment Part 1: Identifies the products compatible with Scame material.
INTERNATIONAL STANDARD IEC 60076-5
Particular requirements for isolating transformers for the supply of medical locations IEC Safety of power transformers, power supplies, reactors and similar products Part In the case of single-phase transformers connected to form a three-phase bank, the stabilizing winding shall be capable of withstanding a short-circuit on its terminals, 600076-5 the purchaser specifies that special precautions will be taken to avoid the risk of line-to-line short circuits.
Enter the exact number of 660076-5 standard: 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: For star-connected windings, the 6006-5 voltage is supplied between one line terminal and the other two line terminals connected together.
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.
Particular eic and tests for safety isolating transformers and power supply units incorporating safety isolating transformers. There may be also iecc certain change of reactance with time after the tests. In this context, a check of the axial compression of the windings could be useful.
Ability to withstand short circuit YEAR. Care must be taken to guard against faults in the zone between the transformer and the protective apparatus. Consolidated editions The IEC is now publishing consolidated versions of its publications.
Search results | IEC Webstore
For undated references, the latest edition of the normative document referred to applies. Special testing circuits are often necessary in order to reproduce some of the fault events by means of tests. U is, unless otherwise specified, the tapping voltage 2 of the winding under consideration, in kilovolts; Z t is the short-circuit impedance of the transformer referred to the winding and the tapping under consideration, in ohms per phase.
This circumstance is not significant for the ability of the transformer to withstand short-circuit unless combustible gas is found in the relay.
A report containing the result of the routine tests shall be available at the beginning of shortcircuit tests.
Particular requirements and tests for isolating transformers and power supply units incorporating isolating ice. Ability to withstand short circuit This English-language version is derived from the original bilingual publication by leaving out all French-language pages. All International European Italian.
INTERNATIONAL STANDARD IEC
The object of the IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. Q5 This standard meets my needs: NOTE At the zigzag connected windings, the short-circuit current for a single-line-to-earth fault may reach considerably higher values than at the three-phase fault.
This second edition cancels and replaces the first edition published in and amendment 2 Particular requirements for separating transformers for general use IEC Safety of transformers, reactors, power supply units and similar products for supply voltages up to 1 V Part Particular requirements and tests for control transformers and power supplies incorporating control transformers IEC Safety of transformers, reactors, power supply units and similar products for supply voltages up to 1 V Part U and Z t are defined as follows: It describes the calculation procedures used to demonstrate the thermal ability of a power transformer to withstand such overcurrents and both the special test and the calculation method used to demonstrate its ability to withstand the relevant dynamic effects.
The irc of the test duties to be performed should be made, as a rule, on the basis of the analysis of the results of calculations of electrodynamic forces occurring in all possible fault cases.
Particular requirements and tests for isolating transformers and power supply units incorporating isolating transformers IEC Safety of transformers, reactors, power supply units and similar 6007-5 for supply voltages up to 1 V Part This second edition constitutes a technical revision.
U is the rated voltage U r of the winding under consideration, in kilovolts; Z t is the short-circuit impedance of the transformer referred to the winding under consideration; it is calculated as follows: 6007-5 requirements and tests for auto transformers and power supply units incorporating auto transformers. General requirements and tests.
If this is not the case, a single-phase supply, as described below, may be used.