Medium Voltage Disconnecting Switch

Disconnecting Switch Type SLOC/D

Sales Office: Precise International Corporation Limited Address: 1842, Krungthep-Nonthaburi Road, Bangsue, Bangkok 10800 Thailand Telephone: (662)910-9700-12 Fax: (662) 910-9713-4 Website: http://www.precise.co.th Email:info@precise.co.th

Factsheet No: CI-101-0002 Issued On: 04/01/2010

General SLOC/D isolators are single-pole, vertical-break, hookstick operated disconnecting switches. These Isolators are suitable for outdoor installation, in all climates, and are capable of withstanding considerable stresses since they have been designed for working in the worst operating conditions, assuring the greatest stability and reliability. SLOC/D isolators can be manufactured according to the most important international standards (CEI-IEC-BS-ANSI…) in order to meet the most different requirements.

Constructive Features Each SLOC/D isolator consists of: - a strong supporting base, made of hot-dip galvanized

steel (mounting hardware and backup members can be supplied on request);

- two post type, porcelain insulators; - a moving arm, made of copper, provided with a

stainless steel pull ring for the hookstick operation; - two copper flat bars, each shaped so as to make both

fixed contact and terminal pad.

Operation SLOC/D isolators are suitable for mounting in both vertical and horizontal underhung position. By pulling down the special ring with a hookstick, the moving arm is released and, with a further pull, the isolator opens; when open, gravity keeps the arm perpendicular to the base, against a blade stop. To close the isolator, the arm has to be raised by means of the hookstick; at the end of the operation, the blade automatically hooks to the fixed contact, thus preventing accidental openings due to vibrations or heavy short-circuit faults.

Contact Features SLOC/D contacts are made of silvered copper; for the higher current ratings, or by request, the silver coating has a thickness that contacts can be considered of the “AG-AG” type. Contacts are self-cleaning and are designed for withstanding considerable stresses due to short-circuits. Under rated service conditions, contact pressure is maintained by stainless steel springs; during a short-circuit, pressure is increased due to the fault current path.

Note: The Manufacturer reserves the right to change technical data or design without prior notice

Medium Voltage Disconnecting Switch

Disconnecting Switch Type SLOC/D

Dimension [ Millimeter ]

Type A B C D SLOC/D 125-630 460 356 431 140 SLOC/D 150-630 460 356 446 140 SLOC/D 150-1250 460 356 446 135 SLOC/D 150-1600 460 356 446 135 SLOC/D 150-2000 460 356 446 135 SLOC/D 170-630 610 457 596 135 SLOC/D 200-630 610 457 596 140 SLOC/D 200-1250 610 457 596 135

Specification According to IEC 60129

Type Unit

SLO

C/D

125

-630

SLO

C/D

150

-630

SLO

C/D

150

-125

0

SLO

C/D

150

-160

0

SLO

C/D

150

-200

0

SLO

C/D

170

-630

SLO

C/D

200

-630

SLO

C/D

200

-125

0 System Voltage kV 22 22 22 22 22 33 33 33

Rated Voltage kV (peak) 24 25.8 25.8 25.8 25.8 36 38 38

Rated insulation level, to earth and between pole :

Rated impulse withstand voltage kV (peak) 125 150 150 150 150 170 200 200

Rated 1-min power-frequency withstand voltage, dry kV rms 70 70 70 70 70 95 95 95

Rated 10-s power-frequency withstand voltage, wet kV rms 60 60 60 60 60 80 80 80

Rated frequency Hz 50 50 50 50 50 50 50 50

Rated normal (continuous) current A rms 630 630 1250 1600 2000 630 630 1250

Rated short-time withstand current kA rms 16 25 38.1 43.8 43.8 16 25 38.1

Rated duration of short-circuit s 1 1 1 1 1 1 1 1

Rated peak withstand current kA 67.5 67.5 102.9 118.3 118.3 67.5 67.5 102.9