ICEA T-24-380-2013 PARTIAL DISCHARGE TEST PROCEDURE.pdf

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1、 ICEA STANDARD FOR PARTIAL DISCHARGE TEST PROCEDURE Approved by AMERICAN NATIONAL STANDARDS INSTITUTE June 26, 2013 Publication # ANSI/ICEA T 24-380-2013 2013 by ICEA INSULATED CABLE ENGINEERS ASSOCIATION, Inc. ANSI/ICEA T-24-380-2013 ANSI/ICEA T-24-380-2013 STANDARD FOR Partial Discharge Test Proce

2、dure Standard ANSI/ICEA T-24-380-2013 Published By INSULATED CABLE ENGINEERS ASSOCIATION, Inc. Post Office Box 1568 Carrollton, Georgia 30112, U.S.A. Approved by Insulated Cable Engineers Association, Inc.: December 5, 2012 Approved by ANSI: June 26, 2013 Copyright 2013 by the Insulated Cable Engine

3、ers Association, Inc. All rights including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, and the International and Pan American Copyright Conventions. ANSI/ICEA T-24-380-2013 NOTICE AND DIS

4、CLAIMER The information in this publication was considered technically sound by the consensus of persons engaged in the development and approval of the document at the time it was developed. Consensus does not necessarily mean that there is unanimous agreement among every person participating in the

5、 development of this document. The Insulated Cable Engineers Association, Inc. (ICEA) standards and guideline publications, of which the document contained herein is one, are developed through a voluntary consensus standards development process. This process brings together persons who have an inter

6、est in the topic covered by this publication. While ICEA administers the process and establishes rules to promote fairness in the development of consensus, it does not independently test, evaluate, or verify the accuracy or completeness of any information or the soundness of any judgments contained

7、in its standards and guideline publications. ICEA disclaims liability for personal injury, property, or other damages of any nature whatsoever, whether special, indirect, consequential, or compensatory, directly or indirectly resulting from the publication, use of, application, or reliance on this d

8、ocument. ICEA disclaims and makes no guaranty or warranty, expressed or implied, as to the accuracy or completeness of any information published herein, and disclaims and makes no warranty that the information in this document will fulfill any of your particular purposes or needs. ICEA does not unde

9、rtake to guarantee the performance of any individual manufacturer or sellers products or services by virtue of this standard or guide. In publishing and making this document available, ICEA is not undertaking to render professional or other services for or on behalf of any person or entity, nor is I

10、CEA undertaking to perform any duty owed by any person or entity to someone else. Anyone using this document should rely on his or her own independent judgment or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstances. I

11、nformation and other standards on the topic covered by this publication may be available from other sources, which the user may wish to consult for additional views or information not covered by this publication. ICEA has no power, nor does it undertake to police or enforce compliance with the conte

12、nts of this document. ICEA does not certify, test, or inspect products, designs, or installations for safety or health purposes. Any certification or other statement of compliance with any health or safety-related information in this document shall not be attributable to ICEA and is solely the respo

13、nsibility of the certifier or maker of the statement. ANSI/ICEA T-24-380-2013 FOREWORD The Insulated Cable Engineers Association Inc. (ICEA) developed this Standards Publication for Partial Discharge Test Procedure (ICEA T-24-380). ICEA standards are adopted in the public interest and are designed t

14、o eliminate misunderstandings between the manufacturer and the user and to assist the user in selecting and obtaining the proper product for his particular need. Existence of an ICEA standard does not in any respect preclude the manufacture or use of products not conforming to the standard. The user

15、 of this Standards Publication is cautioned to observe any health or safety regulations and rules relative to the manufacture and use of cable made in conformity with this Standard. Requests for interpretation of this Standard must be submitted in writing to the Insulated Cable Engineering Associati

16、on, Inc., P. O. Box 1568, Carrollton, Georgia 30112. An official written interpretation will be provided. The Association will welcome suggestions for improvements gained in the use of this Standard. The members of the ICEA working group contributing to the writing of this Standard consisted of the

17、following: R. Bristol, Chairman E. Bartolucci J. Cancelosi B. Crawford A. Davila R. Fleming M. Fuller F. Kuchta P. Leblanc M. Levitre C. Lindler K. Nuckles C. Spradlin R. Szilagyi W. Temple R. Thrash E. Walcott R. Williamson ANSI/ICEA T-24-380-2013 Page i TABLE OF CONTENTS Page 1.0 SCOPE 1 1.1 Singl

18、e Conductor Cables. 1 1.2 Multiple Conductor Cables 1 2.0 DEFINITIONS 1 3.0 TEST APPARATUS. 2 3.1 Alternating-current Power Supply 2 3.2 Voltage Measuring Device 2 3.3 Partial Discharge Measuring Device 2 3.4 Partial Discharge Calibrator. 2 3.5 Supplementary Partial Discharge Meters and Graphic Reco

19、rders 2 4.0 CALIBRATION OF TEST EQUIPMENT 3 4.1 Calibration Schedule. 3 4.2 Calibration Procedure 3 4.2.1 Calibrator Connections. 3 4.2.2 Primary Display Sensitivity 3 4.2.2.1 Oscillograpic Display Adjustment. 3 4.2.2.2 Detector Response. 3 4.2.3 Supplementary Measuring Devices 3 4.2.4 Partial Disch

20、arge Scale 3 4.2.5 Calibration Signal Displaying 4 4.2.5.1 Calibrating Capacitor 4 4.2.5.2 Secondary Calibrating Pulse. 4 5.0 TEST PROCEDURE. 4 5.1 Sequence 4 5.2 Background Noise. 4 5.3 Test Voltage 4 5.3.1 Minimum Partial Discharge Extinction Level 4 5.3.2 Maximum Partial Discharge Level. 5 5.4 Pa

21、rtial Discharge Level 5 6.0 SYSTEM RESPONSE VERIFICATION 5 6.1 AC Voltage Measuring Device 5 6.2 Partial Discharge Measuring Device 5 6.2.1 Linearity. 5 6.2.2 Two Pulse Response 5 6.2.2.1 Characteristics 5 6.2.2.1.1 Two Pulse 6 6.2.2.1.2 Pulse Time Spacing. 6 6.2.2.1.3 Pulse Rise Time 6 6.2.2.2 Proc

22、edure 6 6.2.2.2.1 Equipment Connections 6 ANSI/ICEA T-24-380-2013 Page ii 6.2.2.2.2 Display Adjustments. 6 6.2.2.2.3 Pulse Characteristics Plot 6 6.2.2.2.4 Pulse Resolution Time and Superposition 7 6.3 Calibration. 7 6.3.1 Pulse Rise Time 7 6.3.2 Pulse Synchronization. 7 6.3.3 Calibrating Capacitor

23、Capacitance 7 6.3.4 Calibrator Charge Magnitude. 7 6.4 Supplementary Measuring Devices 7 6.4.1 Verification. 7 6.4.1.1 Deflection Change 8 6.4.1.1.1 Fixed Phase Pulse. 8 6.4.1.1.2 10-Microsecond Pulse 8 6.4.1.1.3 Pulse Repetition Frequency. 8 6.4.2 Full Scale Deflection Time 8 6.4.3 Signal Gating. 8

24、 6.4.3.1 Background Noise 8 Appendix A Principles of Partial Discharge Testing 10 ANSI/ICEA T-24-380-2013 Page 1 1.0 SCOPE This Factory Test Procedure applies to the detection and measurement of partial discharges occurring in the following types of solid dielectric cables: 1.1 Single Conductor Cabl

25、es Single conductor shielded cables and assemblies thereof. 1.2 Multiple Conductor Cables Multiple conductor cables with individually shielded conductors within an outer covering. 2.0 DEFINITIONS Partial Discharge Level: The partial discharge level of the cable under test shall be the maximum contin

26、uous or repetitious apparent charge magnitude, measured in pC occurring at the test voltage. Partial Discharge Extinction Level: The partial discharge extinction level is the voltage at which the apparent charge magnitude falls to five pC or less when, measured in the manner described herein, as the

27、 applied voltage is decreased from the prescribed initial value. Superposition: The summation response of the partial discharge measuring device to either concurrent or time-spaced multiple discharges. The magnitude of superposition is expressed by the percent it differs from the response to known i

28、ndividual discharges. Negative Superposition: A summation response less than the response to the individual discharges. pC: picocoulombs. Positive Superposition: A summation response greater than the response to individual discharges. Pulse Resolution Time: The minimum pulse separation in microsecon

29、ds which produces ten percent positive superposition. Primary Display: The indicating or metering device which is used for the primary calibration of the test equipment and display of discharges during a partial discharge test. The primary display is usually, though not necessarily, a cathode ray os

30、cilloscope or a liquid crystal display (LCD). (See ANSI/ICEA T-24-380-2013 Page 2 Section 6.4 for Supplementary Measuring Devices.) Sensitivity: The sensitivity of the test circuit (with the high voltage supply and the instruments) is defined as the minimum detectable discharge pulse that can be obs

31、erved in the presence of background noise. Individual, clearly identifiable interference pulses may be disregarded. 3.0 TEST APPARATUS The test apparatus shall consist of: 3.1 Alternating-Current Power Supply An alternating-current power supply having a kilovolt ampere capacity adequate for the leng

32、th of cable under test. For the purposes of this test procedure, filters, inductors, and other necessary equipment up to the point at which the cable under test is connected shall be considered to be part of the power supply. The high voltage circuits, the cable terminations, and the test facility s

33、hall be designed and operated in such a manner that the basic interference level is sufficient to achieve the required sensitivity. 3.2 Voltage Measuring Device A voltage measuring device connected directly to the test cable in such a manner that it corresponds to the voltage impressed across the ca

34、ble dielectric. The voltage measuring device must be verified in accordance with Section 6.1. 3.3 Partial Discharge Measuring Device A partial discharge measuring device, which has been verified in accordance with Section 6. The device shall consist of a primary detection circuit, an amplifier and a

35、 primary display. The amplifier output shall be displayed on the primary display using a power frequency time base. A narrow-band pd detection instrument shall be utilized with a measuring frequency tunable within the range of 50 kHz to 1 MHz. 3.4 Partial Discharge Calibrator A partial discharge cal

36、ibrator, which has been verified in accordance with Section 6. The partial discharge calibrator shall consist of a pulse generator and a capacitor. The charge magnitude method (in which the charge transfer in coulombs is equal to the product of the coupling capacitance of the calibrating capacitor i

37、n farads and the calibrating pulse amplitude in volts: (Q=CV) shall be used to calibrate the test equipment. 3.5 Supplementary Partial Discharge Meters and Graphic Recorders Supplementary partial discharge meters and graphic recorders or printers may be used to monitor the amplifier or primary displ

38、ay output of the partial discharge measuring device. Supplementary meters, which have been verified in accordance with Section 6, may be used as a primary display. ANSI/ICEA T-24-380-2013 Page 3 4.0 CALIBRATION OF TEST EQUIPMENT 4.1 Calibration Schedule The test equipment shall be calibrated at the

39、beginning of each working shift of testing according to the following procedure. In addition, the test equipment shall be recalibrated any time the cable being tested is not of the same general construction (different size conductor, metallic shield, nominal insulation thickness or insulation materi

40、al) as the cable used for the most recent calibration, or any time the length of the cable being tested differs from the length of the cable used for the most recent calibration by more than 25%. 4.2 Calibration Procedure 4.2.1 Calibrator Connections The partial discharge calibrator shall be connect

41、ed to the conductor at the end of the test cable opposite that of the partial-discharge detection circuitry. For test lengths of less than 100 ft., the calibrator may be connected to either end of the cable. 4.2.2 Primary Display Sensitivity With one end of the cable connected to the high voltage po

42、wer source and to the partial discharge detection circuit, the amplifier gain shall be adjusted so that the following minimum primary display sensitivity requirements are met. 4.2.2.1 Display Adjustment An oscillographic display should be adjusted to represent 10 pC per centimeter. Other types of di

43、splays and recorders should be adjusted to reflect 5 pC at not less than 20% of the full-scale reading. 4.2.2.2 Detector Response A suitable detector response is obtainable for a charge magnitude of five pC or less. 4.2.3 Supplementary Measuring Devices The gain and response of supplementary measuri

44、ng devices used for recording the test results or for conducting the test shall be adjusted to meet the minimum primary display requirements. 4.2.4 Partial Discharge Scale The accuracy and linearity of the scale used for indicating partial discharge shall be verified in accordance with section 6.2.1

45、 and have a capability of 5% or 1 pC which ever is greater, over the full display range. ANSI/ICEA T-24-380-2013 Page 4 4.2.5 Calibration Signal Display A means of displaying the calibration signal shall be provided. The amplifier gain shall be adjusted only when the calibration signal is displayed. The sensitivity of displays used to conduct the test or record data shall not be less than given in 4.2.2, 4.2.3 and 4.2.4. The calibrating signal shall be provided by: 4.2.5.1 Calibrating Capacitor A calibrating capacitor which is full-voltage rated and forms part of the primary calib