IEEE 62-1995 pdf download IEEE Guide for Diagnostic Field Testing of Electric Power Apparatus- Part 1: Oil Filled Power Transformers, Regulators, and Reactors
1.Overview
1.1 Scope
This guide describes diagnostic tests and measurements that are performed in the field on oil-immersedpower transformers and regulators. Whenever possible, shunt reactors are treated in a similar manner totransformers. The tests are presented systematically in categories depending on the subsystem of the unitbeing examined. A diagnostic chart is included as an aid to identifying the various subsystems. Additionalinformation is provided regarding specialized test and measuring techniques.
nterpretive discussions are also included in several areas to provide additional insight on the particular testor to provide guidance on acceptance criteria. These discussions are based on the authors’judgement ofaccepted practice. It should be noted that sometimes the results of several types of tests should be interpretedtogether to diagnose a problem. Manufacturer’s acceptance criteria should also be consulted as it may takeprecedence over the criteria in this guide.
2. References
This guide shall be used in conjunction with the following publications. When the following standards aresuperseded by an approved revision, the revision shall apply.
ASTM D 117-89, Guide to Test Methods and Specifications for Electrical Insulating Oils of PetroleumOrigin.
ASTM D 877-87.Test Method for Dielectric Breakdown Voltage of Insulating Liquids Using DiskElectrodes.
ASTM D 923-91,Test Method for Sampling Electrical Insulating Liquids.
ASTM D 924-92(b), Test Method for Dissipation Factor (or Power Factor) and Relative Permittivity(Dielectric Constant) of Electrical Insulating Liquids.
IEEE Std C57.104-1991, IEEE Guide for the Interpretation of Gases Generated in Oil-Immersed Transformers(ANSI.
IEEE Std C57.106-1991, IEEE Guide for Acceptance and Maintenance of Insulating Oil in Equipment(ANSI).
IEEE Std C57.113-1991, 1EEE Guide for Partial Discharge Measurement in Liquid-Filled Power Trans.
formers and Shunt Reactors.
3. Definitions
3.1 apparent charge (terminal charge): That charge that, if it could be injected instantaneously betweenthe terminals of the test object, would momentarily change the voltage between its terminals by the sameamount as the partial discharge itself, The apparent charge should not be confused with the charge transferredacross the discharging cavity in the dielectric medium. Apparent charge, within the terms of this guide, isexpressed in coulombs (C). One pC is equal to 10-12 C
3.2 bushing (power and distribution transformer): An insulating structure including a central conductor.or providing a central passage for a conductor, with provision for mounting on a barrier, conducting or otherwise, for the purpose of insulating the conductor from the barrier and conducting current from one side ofthe barrier to the other.
3.3 diagnostic field tests and measurements (power apparatus):Procedures that are performed on site onthe complete apparatus or parts thereof in order to determine its suitability for service.
NOTE-The paramcters measured differ from apparatus to apparatus and may include clectrical, mechanical, chemicalthermal, ctc.. quantities. Interpretation of the results is usually based on a change in the measured characteristics and/orby comparison with pre-established criteria. The tests are normally carried out at regular intervals based on users’experience and/or manufacturers’ recommendations. These tests may also be performed on defective apparatus in order todetermine the location and/or cause of failure.
3.4 dissipation factor (dielectric): The cotangent of the phase angle between a sinusoidal voltage appliedacross a dielectric (or combinations of dielectrics) and the resulting current through the dielectric system.
3.5 partial discharge (PD): Electric discharge that only partially bridges the insulation between conductors.
3.6 power factor (dielectric): The cosine of the phase angle between a sinusoidal voltage applied across adielectric (or combinations of dielectrics) and the resulting current through the dielectric system.
For definitions of other terms concerning transformers see IEEE Std C571280-1978
IEEE 62-1995 pdf download
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