BS EN 60885-3:2015 – TC:2020 Edition
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Tracked Changes. Electrical test methods for electric cables – Test methods for partial discharge measurements on lengths of extruded power cables
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 85 |
IEC 60885-3:2015 is available as /2 which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition. IEC 60885-3:2015 specifies the test methods for partial discharge (PD) measurements on lengths of extruded power cable, but does not include measurements made on installed cable systems. Reference is made to IEC 60270 which gives the techniques and considerations applicable to partial discharge measurements in general. This second edition of IEC 60885-3 cancels and replaces the first edition, published in 1988 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: – The definition of sensitivity as twice the background noise level has been removed and replaced by a practical assessment of sensitivity based on the minimum level of detectable discharge. – References to measurements of pulse heights in mm on an oscilloscope have been replaced by measurements of partial discharge magnitude in pC. – The order of the clauses has been revised in line with the general numbering scheme of IEC standards and to provide clarity in order to facilitate its practical use. Section 3 of the first edition (Application guide) has been removed as it is considered that background information is better obtained from the original references as listed in the bibliography.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 63 | English CONTENTS |
| 65 | FOREWORD |
| 67 | 1 Scope 2 Normative references 3 Terms, definitions and symbols 3.1 Terms and definitions 3.2 Symbols used in Figures 1 to 14 |
| 68 | 4 Overview 4.1 General 4.2 Object 4.3 Problem of superposition of travelling waves for long lengths Figures Figure 1 – Discharge site exactly at the cable end remote from the detector (x = l) |
| 69 | Figure 2 – Discharge site at a distance x = x1 – Travelling waves Figure 3 – Attenuation of PD pulses along the cable |
| 70 | Figure 4 – Superposition and attenuation of PD pulses |
| 71 | 5 Partial discharge tests 5.1 Test apparatus 5.1.1 Equipment 5.1.2 Test circuit and instruments 5.1.3 Double pulse generator 5.1.4 Terminal impedance 5.1.5 Reflection suppressor 5.2 Setting up the test circuit 5.2.1 Determination of characteristic properties of the test circuit 5.2.2 Terminal impedance |
| 72 | 5.2.3 Determination of superposition of travelling waves 5.2.4 Reflection suppressor 5.2.5 Calibration of the measuring system in the complete test circuit 5.2.6 Sensitivity 5.3 Measurement procedures 5.3.1 General |
| 73 | 5.3.2 Short cable lengths including type test lengths 5.3.3 Long cable lengths tested without a terminal impedance |
| 74 | 5.3.4 Long cable lengths tested with a terminal impedance |
| 75 | 5.3.5 Long cable lengths tested with a reflection suppressor |
| 76 | 5.4 Voltage levels/partial discharge limits 5.5 Double pulse behaviour and plotting the double pulse diagram |
| 77 | 5.6 Requirements for the terminal impedance 5.6.1 General 5.6.2 RC element |
| 78 | 5.6.3 RLC element series resonance circuit Figure 5 – Input unit ZA connected in series with the coupling capacitor, CK |
| 79 | Figure 6 – Input unit ZA connected in series with the cable, Cx Figure 7 – Bridge circuit Figure 8 – Connection of the terminal impedance Zw |
| 80 | Figure 9 – Connection of the reflection suppressor, RS Figure 10 – Connection of the double pulse generator into the measuring circuit in Figure 5 Figure 11 – Double pulse diagram type 1 without negative superposition |
| 81 | Figure 12 – Double pulse diagram type 2 with negative superposition between t1 and t2 Figure 13 – Double pulse diagram type 3 with negative and positive superpositions between t1 and t2 Figure 14 – Connection of the double pulse generator for the test circuit in Figure 9 with the reflection suppressor |
| 82 | Bibliography |
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