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INSULATOR PRODUCTION

for industrial power engineering, industry, steelworks and mines.

Insulators type W and WR

Aplication

Casting resin indoor insulator type W aplication in switching stations, switch boards and others electrical equipments of AC for maximal rated voltage 7,2; 12; 17,5; 24; 36 i 40 kV ; temperatures from ­25˚c to +90˚C and humidity up to 90 %. Insulator type WR consists essentially of a capacitive voltage divider. It is an element (detection) of voltage indication systems cooperativly with indicator. Insulator WR can be use as to cooperative with look relay to limit a risk hazard persons neither during normal nor during distarbed operation.

Type marking structure

W(R) Ur-Po

  • W – post insulator
  • WR – capacitive post insulator
  • Ur – rated voltage in kV ­ accordingly 7,2; 12; 17,5; 24; 36 i 40
  • Po – failing load bending in kN – accordingly 4; 6 i 8

Example: WR 24­8 – capacitive insulator, rated voltage ­ 24 kV and failing load bending 8 kN

Attencion: W(R) 12­4/115 technical datas like W(R) 12­4 but hight 115 mm

Casting resin basic dates

  • Breakdown strenght > 18 kV/mm
  • Comparative Tracking Index CTI > 600
  • Thermal class 155 oC [F]

Recommended torque (screw class 8.8)

  • M8 – 18 Nm
  • M10 – 35 Nm
  • M12 – 60 Nm
  • M16 – 145 Nm
  • M20 – 290 Nm

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