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eLibrary > BS EN 60885-3:2015 Electrical test methods for electric cables - Test methods for partial discharge measurements on lengths of extruded power cables >

BS EN 60885-3:2015 Electrical test methods for electric cables - Test methods for partial discharge measurements on lengths of extruded power cables, 2015

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BS EN 60885-3:2015 Electrical test methods for electric cables - Test methods for partial discharge measurements on lengths of extruded power cables, 2015

30323700-VOR.pdf [Go to Page]
English [Go to Page]
CONTENTS
FOREWORD
1 Scope
2 Normative references
3 Terms, definitions and symbols [Go to Page]
3.1 Terms and definitions
3.2 Symbols used in Figures 1 to 14
4 Overview [Go to Page]
4.1 General
4.2 Object
4.3 Problem of superposition of travelling waves for long lengths
5 Partial discharge tests [Go to Page]
5.1 Test apparatus [Go to Page]
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 [Go to Page]
5.2.1 Determination of characteristic properties of the test circuit
5.2.2 Terminal impedance
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 [Go to Page]
5.3.1 General
5.3.2 Short cable lengths including type test lengths
5.3.3 Long cable lengths tested without a terminal impedance
5.3.4 Long cable lengths tested with a terminal impedance
5.3.5 Long cable lengths tested with a reflection suppressor
5.4 Voltage levels/partial discharge limits
5.5 Double pulse behaviour and plotting the double pulse diagram
5.6 Requirements for the terminal impedance [Go to Page]
5.6.1 General
5.6.2 RC element
5.6.3 RLC element series resonance circuit
Bibliography
Figures [Go to Page]
Figure 1 – Discharge site exactly at the cable end remote from the detector (x = l)
Figure 2 – Discharge site at a distance x = x1 – Travelling waves
Figure 3 – Attenuation of PD pulses along the cable
Figure 4 – Superposition and attenuation of PD pulses
Figure 5 – Input unit ZA connected in series with the coupling capacitor, CK
Figure 6 – Input unit ZA connected in series with the cable, Cx
Figure 7 – Bridge circuit
Figure 8 – Connection of the terminal impedance Zw
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
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
Français [Go to Page]
SOMMAIRE
AVANT-PROPOS
1 Domaine d'application
2 Références normatives
3 Termes, définitions et symboles [Go to Page]
3.1 Termes et définitions
3.2 Symboles utilisés dans les Figures 1 à 14
4 Vue d'ensemble [Go to Page]
4.1 Généralités
4.2 Objet
4.3 Problème de superposition des ondes progressives pour de grandes longueurs
5 Essais de décharges partielles [Go to Page]
5.1 Appareillage d’essai [Go to Page]
5.1.1 Matériel
5.1.2 Circuit d’essai et instruments
5.1.3 Générateur à double impulsion
5.1.4 Impédance terminale
5.1.5 Suppresseur de réflexion
5.2 Montage du circuit d'essai [Go to Page]
5.2.1 Détermination des propriétés caractéristiques du circuit d’essai
5.2.2 Impédance terminale
5.2.3 Détermination de la superposition des ondes progressives
5.2.4 Suppresseur de réflexion
5.2.5 Étalonnage du système de mesure dans le circuit d'essai complet
5.2.6 Sensibilité
5.3 Méthodes de mesures [Go to Page]
5.3.1 Généralités
5.3.2 Courtes longueurs de câble y compris les longueurs pour essai de type
5.3.3 Grandes longueurs de câbles soumises à essai sans impédance terminale
5.3.4 Grandes longueurs de câbles soumises à essai avec une impédance terminale
5.3.5 Grandes longueurs de câble soumises à essai avec un suppresseur de réflexion
5.4 Niveaux de tension/limites des décharges partielles
5.5 Comportement de la double impulsion et traçage du diagramme de double impulsion
5.6 Exigences relatives à l'impédance terminale [Go to Page]
5.6.1 Généralités
5.6.2 Élément RC
5.6.3 Élément RLC (circuit série résonnant)
Bibliographie
Figures [Go to Page]
Figure 1 – Décharge située exactement à l’extrémité du câble éloignée du détecteur (x = l)
Figure 2 – Décharge située à une distance x = x1 – Ondes progressives
Figure 3 – Atténuation des impulsions de décharges partielles le long du câble
Figure 4 – Superposition et atténuation des impulsions des décharges partielles
Figure 5 – Unité d'entrée ZA connectée en série avec le condensateur de couplage, CK
Figure 6 – Unité d'entrée ZA connectée en série avec le câble, Cx
Figure 7 – Circuit en pont
Figure 8 – Connexion de l'impédance terminale Zw
Figure 9 – Connexion du suppresseur de réflexion, RS
Figure 10 – Connexion du générateur à double impulsion dans le circuit de mesure illustré à la Figure 5
Figure 11 – Diagramme de double impulsion type 1 sans superposition négative
Figure 12 – Diagramme de double impulsion type 2 avec superposition négative entre t1 et t2
Figure 13 – Diagramme de double impulsion type 3 avec superpositions négativeet positive entre t1 et t2
Figure 14 – Connexion du générateur à double impulsion pour le circuit d’essai illustré à la Figure 9 avec le suppresseur de réflexion [Go to Page]

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BS EN 60885-3:2015 Electrical test methods for electric cables - Test methods for partial discharge measurements on lengths of extruded power cables, 2015

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