This part of IEC applies to three-phase and single-phase power transformers (including auto-transformers) with the exception of certain categories of. NORME CE1 INTERNATIONALE IEC INTERNATIONAL STANDARD Edition Edition consolidée par l’amendement Edition . Buy IEC Ed. Power transformers Part 1: General from SAI Global.
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P Any peculiarities of installation, assembly, transport and handling.
Three examples are shown below and illustrated in figure 2. I specialist marketing 13 1 unacceptable, other For information about rules and tests regarding the temperature rise of oil- immersed transformers see IEC The phase I phasor of the low-voltage winding is oriented according to the induced voltage relation which results for the connection iex.
Whetherunbalancedthree- phase loading is anticipated. If winding balancing ampere-turns are missing in the zero-sequence system, 60067-1 example, in a star-star-connected transformer without delta winding, the applied voltage shall not exceed the phase-to-neutral voltage at normal operation.
If the neutral point of a star-connected or zigzag-connected winding is brought out, the indication shall be YN yn or ZN Zn respectively.
If a lightning impulse voltage test is required, whether or not the test is to include chopped waves see IEC The specification of these data may be accomplished in two different ways: Percentagevalues may lead to confusionbecause of varyingpracticesconcerning referencevalues.
Whether a stabilizing winding is required and, if so, the method of earthing. Short-circuit impedance,impedance or range see annex C.
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Theobject of theIECistopromote international co-operation on all questions concerning standardization in the electrical and electronic fields.
For selection of tapping for the test, see 5. This means that the remaining tappings towards the extreme tapping are reduced-power tappings see figures l al b and I C.
NOTE These requirements do notapply to specialpurposetransformers, some of which do notneed loading capability above rated power. NOTE 1 Certain accessories may be susceptible to electromagnetic interference NOTE 2 Passiveelements are notliable to causeelectromagneticdisturbancesand their performance is not liable to be affected by such disturbances.
For a three- phasetransformer the impedance is expressed 600076-1 phase impedance equivalent star connection. I Specified load current for loss determination rated current, tapping current, other specified value related to a particular loading case. U,I, Tappingvoltageandtappingcurrentintheuntappedwinding.
For a three-phase winding it is the voltage between line terminals [IEVmodified] NOTE 1 The rated voltages of all windings appear simultaneously at no-load when the voltage applied to one of them has its rated value.
Correction for measuring transformer errors and for resistance of thetest connectionsshouldbeappliedunless they are obviously negligible see IEC I A autre s NOTE 2 Thezero-sequenceimpedance may be dependent on the value of the current andthe temperature, particularly irc transformers without any delta-connected winding.
Log In Iex Up. Variable flux voltage variation VFVV These may be factors such as high altitude, extreme high or lowtemperature,tropical humidity, seismicactivity, severe contamination, unusual voltage or load current wave shapes and intermittent loading.
IEC – Power Transformers Package
Abscissa Tapping factor, percentage indicating relative number of effective turns in tapped winding. Insulation levels and dielectric tests IEC Theresultingfigureshallthen be correctedto referencetemperature NOTE 2 The zero-sequence impedance is dependent upon thephysicaldisposition of the windings and the magnetic parts and measurements on different windings may not, therefore, agree. S dry-type transformer a transformer of which the magnetic circuit and windings are not immersed in an insulating liquid [IEV 3.
Theterminal intended for connectiontoaneutralpoint of anetwork[IEV, modified] 3. The connection diagrams show the high-voltage winding above, and the low-voltage winding below. No phase displacement notation would then apply for the stabilizing winding.
Regarding the full presentation on the nameplate of data related to individual tappings, see clause 7. NOTE 1 Inconditions wherewindingbalancing ampere-turnsare missing,therelationbetween voltage and current is generally not linear.
Theirpreparationis entrustedtotechnicalcommittees;any IEC NationalCommitteeinterested in thesubjectdealtwith may participateinthispreparatorywork. The following types are distinguished: