IEEE C57.12.91-2001 pdf download IEEE Standard Test Code for Dry-Type Distribution and Power Transformers
1.Scope
This standard describes methods for performing tests specified in IEEE Std C57.12.01-1998- and otherreferenced standards applicable to dry-type distribution and power transformers. It is intended for use as abasis for performance, safety, and the proper testing of dry-type distribution and power transformers.
This standard applies to all dry-type transformers except instrument transformers, step-voltage and inductionvoltage regulators, arc furnace transformers. rectifier transformers, specialty transformers, and minetransformers.
1.1 Purpose
The purpose of this standard is to provide test procedure information. Transformer requirements and specifctest criteria are not a part of this standard but are contained in appropriate standards such asIEEE Std C57.12.01-1998 or in user specifications.
1.2 Word usage
When this standard is used on a mandatory basis, the word shall indicates mandatory requirements; the wordsshould or may refer to matters that are recommended or permissive, but not mandatory.
NOTE-The introduction of this standard describes the circumstances in which the standard may be used on a mandatory basis.
2. References
Various standards and guides are listed below. References are identifed throughout this standard by designation number and year.
When the standards referenced in this standard are superseded by a revision, the latest revision shall apply
3. Definitions
Standard transformer terminology available in IEEE Std C57.12.80-1978 shall apply. Other electrical termsare defined in The Authoritative Dictionary of lEEE Standards Terms, Seventh Edition.
4.General
4.1 Test definitions
Various types of tests such as routine, design, other, and conformance are defined in IEEE Std C57.12.80.1978，
4.2 Test requirements
A general summarv of test requirements is included in Table 15 of 1EEE Std C571201-1998. which indicatesbv size (500 kVA and smaller or 501 kVA and larger) which tests are normallv considered routine, desien. orother.
4.3 Test sequence
See 10.1.5.4 for sequence of dielectric tests when lightning impulse tests are specified.
NOTE–If it is desired to minimize potential damage to 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 (whenapplicable) should precede dielectric tests. When this sequence is used, the beginning tests involve voltages and currentsthat are usually reduced compared to rated values, thus tending to minimize damaging effects to the transformer.
4.4 Instrumentation
Although the figures in this standard show conventional meters, adequate digital-readout measuring devicesand digital sampling techniques with computer calculations are considered satisfactory alternatives.
IEEE C57.12.91-2001 pdf download
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