1.1 This test method covers the detection and measurement of partial discharge (corona) pulses at the terminals of an insulation system under an applied test voltage, including the determination of partial discharge (corona) inception and extinction voltages as the test voltage is raised and lowered. The test method is also useful in determining quantities such as apparent charge and pulse repetition rate together with such integrated quantities as average current, quadratic rate and power. The test method is useful for test voltages ranging in frequency from zero (direct voltage) to approximately 2000 Hz.
1.2 The test method is directly applicable to a simple insulation system that can be represented as a two-terminal capacitor (1), (2).
1.3 The test method is also applicable to (distributed parameter) insulation systems such as high-voltage cable. Consideration must be given to attenuation and reflection phenomena in this type of system. Further information on distributed parameter systems of cables, transformers, and rotating machines will be found in Refs. (1), (2), (3), (4), (5), (6), (7), (8), and (9). (See AEIC CS5-87, IEEE C57 113-1991, IEEE C57 124-1991, and IEEE 1434-2005.)
1.4 The test method can be applied to multi-terminal insulation systems, but at some loss in accuracy, especially where the insulation of inductive windings is involved.
This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific precaution statements are given in Sections 8 and 14.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
D618 Practice for Conditioning Plastics for Testing
D2275 Test Method for Voltage Endurance of Solid Electrical Insulating Materials Subjected to Partial Discharges (Corona) on the Surface
D3382 Test Methods for Measurement of Energy and Integrated Charge Transfer Due to Partial Discharges (Corona) Using Bridge Techniques
average discharge (corona) current (It); calibration pulse; corona; continuous partial discharges (continuous corona); discharge magnitude; ionization; partial discharge apparent power loss (Pa); partial discharge (corona); partial discharge (corona) energy (W); partial discharge (corona) extinction voltage; partial discharge (corona) inception voltage (CIV); partial discharge (corona) level; partial discharge (corona) power loss (P); partial discharge (corona) pulse rate (n); partial discharge pulse; partial discharge pulse voltage (Vt); partial discharge quantity (terminal corona charge); pulse height; quadratic rate
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