Composite Hollow Insulators

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  • Verbundstoff-Schirmisolatoren
  • Verbundstoff-Schirmisolatoren

Composite hollow insulators are used in outdoor AC electrical equipment or indoor with rated voltages between 1 kV and 800 kV and frequencies to 100 Hz, or in DC equipment with rated voltage above 1.5 kV.  They usually serve as enclosures (covers) for current transformers and power transformers, circuit breakers, bushings, etc. and surge arresters or other electrical equipment.

Because of excellent mechanical properties, flexibility, relatively low weight compared to ceramic covers and excellent electrical parameters, composite hollow insulators are preferred
for use in overhead installations (pollution degree zones I – IV), especially in seismic hazard areas.

In addition, composite tubular insulators are characterized by:

  • High resistance to weathering, including UV radiation,
  • Excellent hydrophobicity and chemical resistance of silicone elastomers.

Composite hollow insulators (insulating covers) are made of glass-epoxy tube, metal fittings fixed at the end of the tube and insulating sheath made of silicone rubber. The tube is made of
made of ECR glass fibre saturated with epoxy composition. It is the insulator's supporting core
and is used to transfer mechanical loads (mainly bending loads and stress, sometimes also torsional loads). Metal end fittings are fixed to the tube ends with epoxy adhesive of of high mechanical and thermal strength. The silicone cover is moulded by LSR liquid silicone elastomer injection, which protects the core against the environment
and at the same time, by appropriate shaping of the sheds, determines the electrical properties of the insulator.

Technical specyfications
Series Internal Cover Diameter
mm
Cover Height
mm
Creepage distance
mm
  min. max min. max.
1. 80 780 4330 628 4178
2. 98 450 4290 1380 19892
3. 120/122 910 4310 6000 14820
4. 120/122 510 4310 1080 22310
5. 130 780 4680 2250 16763
6. 153,7/160 540 4640 935 16146
7. 153,7/160 640 4640 1356 17186
8. 198/200/202 1022 4312 3088 15478
9. 220/228 694 4344 1905 17600
10. 248/250 474 4324 752 15036
11. 248/250 874 4324 2442 16111
12. 328 1040 4790 2063 16088
13. 328 990 4790 2145 17204
14. 340 1040 4340 2063 14385
15. 350 830 4330 2145 15795

 

Composite hollow insulators are compliant with PN-EN 61462.