Silicone cable accessories appeared in the late 1960ies, Triggered - - PowerPoint PPT Presentation

▶
silicone cable accessories appeared in the late 1960ies
SMART_READER_LITE
LIVE PREVIEW

Silicone cable accessories appeared in the late 1960ies, Triggered - - PowerPoint PPT Presentation

Sep 12, 2022 452 likes •633 views

13,04 13,0 4 INTRODUCTION 6,03 Silicone cable accessories appeared in the late 1960ies, Triggered by extruded XLPE-cables, Field-grading and insulating parts in a prefabricated body, Easy assembly, Avoidance of mounting errors,

slide-1
SLIDE 1 6,03 13,04 13,0 4 7,90

Silicones for Cable Accessories 2017, November, 8th

1 of 19

INTRODUCTION

  • Silicone cable accessories appeared in the late 1960ies,
  • Triggered by extruded XLPE-cables,
  • Field-grading and insulating parts in a prefabricated body,
  • Easy assembly, Avoidance of mounting errors,
  • Design constantly refined,
  • What is the State of the Art?
slide-2
SLIDE 2 6,03 13,04 13,0 4 7,90

Silicones for Cable Accessories 2017, November, 8th

2 of 19

inner conductor inner cond. layer main insulation

  • uter conductive layer
  • uter conductor
  • uter insulation (jacket)

MEDIUM VOLTAGE POWER CABLE

slide-3
SLIDE 3 6,03 13,04 13,0 4 7,90

Silicones for Cable Accessories 2015, March 4th

3 of 25

connector cable insulation insulating silicone elastomer conductive/ permittivesilicone elastomer spiral support core

TYPICAL DESIGN OF SILICONE JOINT

slide-4
SLIDE 4 6,03 13,04 13,0 4 7,90

Silicones for Cable Accessories 2017, November, 8th

4 of 19

CABLE JOINTS (molded ans extruded)

slide-5
SLIDE 5 6,03 13,04 13,0 4 7,90

Silicones for Cable Accessories 2015, March 4th

5 of 25

TYPICAL DESIGN OF A SILICONE TERMINATION

Surface is exposed to wheathering and pollution – Erosion resistance!

slide-6
SLIDE 6 6,03 13,04 13,0 4 7,90

Silicones for Cable Accessories 2017, November, 8th

6 of 19

CABLE ACCESSORIES - TYPES OF ACCESSORIES

slide-7
SLIDE 7 6,03 13,04 13,0 4 7,90

Silicones for Cable Accessories 2017, November, 8th

7 of 19

TASKS OF CABLE ACCESSORIES

Electrical connection Sealing To withstand weathering Field grading

slide-8
SLIDE 8 6,03 13,04 13,0 4 7,90

Silicones for Cable Accessories 2017, November, 8th

8 of 19

TYPES OF SILICONE MATERIALS

Pastes Elastomers (HCR) Gels Elastomers (LSR)

slide-9
SLIDE 9 6,03 13,04 13,0 4 7,90

Silicones for Cable Accessories 2017, November, 8th

9 of 19

MATERIAL PROPERTIES

  • Resistance to Tracking and Erosion,
  • Resistance to Corona and Ozone,
  • Resistance to Chemical and Physical Degradation by Water,
  • Tear Strength,
  • Volume Resistivity,
  • Breakdown Field Strength,
  • Resistance to Chemical Attack,
  • Resistance to Weathering and UV,
  • Resistance to Flammability,
  • Arc Resistance,
  • Glass Transition Temperature,
  • Hydrophobicity.

General requirements for materials for CA not standardized. IEC 62039TR:2007 covers the material for outdoor cable accessories and defines the following properties:

slide-10
SLIDE 10 6,03 13,04 13,0 4 7,90

Silicones for Cable Accessories 2017, November, 8th

10 of 19

IEC 60587 - TRACKING AND EROSION

slide-11
SLIDE 11 6,03 13,04 13,0 4 7,90

Silicones for Cable Accessories 2017, November, 8th

11 of 19

TRACKING AND EROSION (for terminations))

Class 1 A 3.5 is the minimum requirement acc. ti IEC 62039TR; Our silicone elastomers typically show the highest class 1 A 4.5

slide-12
SLIDE 12 6,03 13,04 13,0 4 7,90

Silicones for Cable Accessories 2017, November, 8th

12 of 19

BREAKDOWN FIELD STRENGTH

New Edition of IEC 60243 with subclause „Elastomers“: Use test specimens of (1,0 ± 0,1) mm thickness with sufficient lateral dimensions to prevent flashover …. . As electrode arrangement, unequal electrodes according 5.2.1.3 (see Figure 1c) shall be used. In the case of elastomers of low hardness, e.g. silicone rubbers, a suitable casting material shall be used as embedding material or surrounding medium, respectively.

slide-13
SLIDE 13 6,03 13,04 13,0 4 7,90

Silicones for Cable Accessories 2017, November, 8th

13 of 19

ELECTRODE ARRANGEMENT

slide-14
SLIDE 14 6,03 13,04 13,0 4 7,90

Silicones for Cable Accessories 2017, November, 8th

14 of 19

ELECTRODE ARRANGEMENT

slide-15
SLIDE 15 6,03 13,04 13,0 4 7,90

Silicones for Cable Accessories 2017, November, 8th

15 of 19

BREAKDOWN FIELD STRENGTH (old arrangment)

specific breakdown voltage [kV/mm] silicone elastomer number

slide-16
SLIDE 16 6,03 13,04 13,0 4 7,90

Silicones for Cable Accessories 2017, November, 8th

16 of 19

BREAKDOWN FIELD STRENGTH (new arrangment)

silicone elastomer number specific breakdown voltage [kV/mm]

slide-17
SLIDE 17 6,03 13,04 13,0 4 7,90

Silicones for Cable Accessories 2017, November, 8th

17 of 19

Thank you very much for your kind attention!