The outer diameter of the container in use shall be at least mm larger than the external diameter of the outer coil. The manufacturer's instructions on loading capabilities should be followed and loading guides are available in national standards. Consolidated editions The IEC is now publishing consolidated versions of its publications. Computer System Validation Master Plan. Three-phase transformers comprising of three single-phase transformers shall be tested as for three-phase transformers. IEC 1 Power transformers General. In the case of testing installations operating with forced air, the flow-rate may be adjusted by acting on the fan system. 
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Except for the characteristics inherent in the design of the transformer, no special measures are taken to limit flammability. The transformer shall be fully rated when supplied in an enclosure.
IEC 60905:1987
The location of the measuring points shall be the same for the reference and final measurements. IEC 1 Power transformers General. The temperature of the core, metallic parts and adjacent materials shall not reach a value that will cause damage to any part of the transformer. The details of test procedures and acceptable limits may be agreed between purchaser and supplier unless specified in national regulations.
Self protected liquid filled transformers 1 Part 6005 Any site conditions that may either impose restrictions on the cooling air or produce high ambient air 6090 should be stated by the purchaser. The resistance of the high voltage and low voltage windings shall be measured, these values will be used as reference values for the calculation of the temperature rise of the two windings.
For the purpose of determining when steady state conditions have been achieved, thermocouples or thermometers shall be applied to the following surfaces: This is commonly achieved in a clean, dry indoor installation. The outer coil diameter of circular or the maximum cross dimension for non-circular windings to be tested shall be between mm and mm of a standard transformer. You're using an out-of-date version of Internet Explorer.
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Sign In Your Account. 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 they are used or for any misinterpretation by any end user.
The location of the measuring points that is, the ambient temperature thermometers and sensors on the transformer, if anyshall be the same for the reference and final measurements. Within the air-inlet duct there shall be a measuring section of mm diameter and a length of at least mm at a distance of at least 1 m from the air inlet into the test chamber and to the air-inlet to the duct.
The duration of the test at full voltage shall be 60 s for any test frequency up to and including twice the rated frequency. Special tests according to the procedure of Clause 26 shall confirm the conformity of E1 or E2 class transformers. No drops of water shall be present on the surface of the coils. National laws and regulations jec govern the steps to kec taken to improve safety in b and c above.
The test basis for all characteristics other than insulation oec the rated condition, unless the test Clause states otherwise. Where IEC standards do not exist for the transformers mentioned above or for other special transformers, this standard may be applicable as a whole or in parts.
Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. In a three phase transformer, the measurement should preferably associated with the middle limb in case of star connected winding.
The maximum temperature occurring in any part of the winding insulation system is called the hot-spot temperature.
Contains 0 items Total: NOTE Windings with larger or smaller dimensions may be tested by agreement. These conditions are assumed to demonstrate that the fire had ceased to burn.
During the voltage application, no flashover shall occur and visual inspection shall not show any serious tracking.
Tests shall be performed on a completely assembled transformer including relevant accessories supplied. The rating plate shall indicate both the power rating without fans and the maximum power rating with fan cooling.
Loading guide for dry-type power transformers
One winding, preferably the inner winding, of the transformer is excited at rated voltage with the other connected to a suitable load such that rated currents flow in both windings. NOTE These are important not only during service but also during storage before installation.
There is ied special fire risk to consider.
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