IEEE STD C57.12.90 PDF

3 Park Avenue. New York, NY USA. IEEE Power and Energy Society. IEEE Std C™/Cor (Corrigendum to. The definition of constant k in Equation 2 (in ) and line terminal rated voltage in the last paragraph of are corrected in this corrigendum. Define IEEE Standard C means the IEEE Standard Test Code for Liquid – Immersed Distribution, Power, and Regulating Transformers, ;.

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Skip to main content. Log In Sign Up. Downloaded on March 09, at Authorized licensed use limited to: Instrument transformers, step-voltage and induction voltage regulators, arc furnace transformers, rectifier transformers, specialty transformers, grounding transformers, and mine transformers are excluded. Resistance measurements, polarity and phase-relation tests, ratio tests, no-load loss and excitation current measurements, impedance and load loss measurements, dielectric tests, temperature tests, short-circuit tests, audible sound level measurements, and calculated data are covered in this standard.

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IEEE Standard C | legal definition of IEEE Standard C by

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Petersen Daidi Zhong Annette D. This document is a voluntary consensus standard. Its use may become mandatory only when required by a duly constituted legal authority or when specified in a contractual relationship. To meet specialized needs and to allow innovation, specific changes are permissible when mutually determined by the purchaser and manufacturer, provided that such changes do not violate existing laws and are considered technically adequate for the function intended.

This standard is on c57.21.90 continuous revision cycle and is constantly being reviewed and updated. One can go to the website www. The following is a brief summary of the non-editorial changes in this revision: The number of full wave impulses applied during the test sequence has increased from one to two or three.

Multiple references are added to Annex D. Technical revisions were prepared by various groups within the IEEE Transformers Committee and have been surveyed and approved by these groups up through the subcommittee level. Polarity and phase-relation tests No-load losses and excitation current Load losses and cc57.12.90 voltage IEEE Standards documents are not intended to ensure safety, security, health, or environmental protection, or ensure against interference with or from other devices or networks.

Implementers of IEEE Standards documents are responsible for determining and complying with all appropriate safety, c5712.90, environmental, health, and interference protection practices and all applicable laws and regulations. This IEEE document is made available for use subject to important notices and legal disclaimers. It is intended for use as a basis for performance and proper testing of such transformers.

Definition of IEEE Standard C57.12.90

This standard applies to all liquid-immersed transformers, except instrument transformers, step-voltage and induction voltage regulators, arc furnace transformers, rectifier transformers, specialty transformers, grounding transformers, and mine transformers.


Transformer requirements and specific test criteria are not a part of this standard, but they jeee contained in appropriate standards, such as IEEE Std C Normative references The following referenced documents are indispensable for the application of this document i. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document including any amendments or corrigenda applies.

Definitions For the purposes of this document, the following terms and definitions apply. The time interval from the start ieeee the transient to the time when the maximum amplitude is reached. The sound pressure level measured at the test facility or c57.12.0 the substation without the transformer energized.

Loudness that is measured with a sound level meter using the A-weighted response filter that is built into the meter circuitry. The A-weighting filter is commonly used to measure community noise, and it simulates the frequency response of the human ear.

Loudness that is measured with a sound level meter using the C-weighted filter that is built into the sound level meter. The C-weighting has only little dependence on frequency over the greater part of the audible frequency range. The ratio of the useful power output of a transformer to the total power input. One or more conducting elements arranged and connected on an electrical instrument or measuring circuit to divert unwanted currents from the measuring means.

A room with a solid floor and an undetermined amount of sound-absorbing materials on the walls and ceiling. The time interval from the start of the transient to the time when the first voltage zero occurs on the tail of the wave. The sum of the no-load losses and the load losses. NOTE—To minimize potential problems for the transformer during testing, the resistance, polarity, phase relation, ratio, no-load loss and excitation current, impedance, and load loss tests and temperature-rise tests, when applicable should precede dielectric tests.

Using this sequence, the beginning tests involve voltages and currents, which are usually reduced as compared with rated values, thus tending to minimize problematic effects to the transformer. Resistance measurements Resistance measurements are of fundamental importance for the following purposes: The precautions in 5. It should not be assumed that the windings are at the same temperature as the surrounding air. In addition, it may be necessary to convert the resistance measurements to the temperature at which the impedance loss measurements were made.

The conversions are accomplished by Equation 1: To use this method, the following steps should be taken: Electronic switching power supplies may be used as voltage sources; however, batteries or filtered rectifiers may also be used, especially in instances where less ripple is desired in the measurement.

Automatic recording of the resistance data is recommended so that the time to saturation and the variability of the resistance readings after stabilization can be documented.

This step is to avoid including in the reading the resistances of current-carrying leads and their contacts and of extra lengths of leads. To protect test personnel from inductive kick, the current may be switched off by a suitably insulated switch with a protective circuit to discharge the energy. That period of time should be allowed to elapse before taking the first reading when final winding hot-resistance measurements are being made.

The residual flux in the core should be made the same for both the cold-resistance and hot- resistance measurements by saturating the core with direct current prior to the measurement. In general, the winding will exhibit a long time constant. To reduce the time required for the current to reach its steady-state value, a noninductive external resistor may be added in series with the dc source. It may then be necessary to increase the source voltage to compensate for the voltage drop in the series resistor.

The time will also be reduced by passing a direct current c5712.90 other windings in either the same polarity as the winding being tested for windings on the same phase or opposite polarity for other phases during these tests.

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