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Disconnect Switches used for power transmission and distribution systems

Disconnect Switches used for power transmission and distribution systems consist of insulator, disconnectors, switchgear, conductors and other assembly.

Disconnect Switches

Applicable standards and guidelines:
SS 40103 10: Switchgear, controlgear and fuses - Vocabulary
SS-EN 60694: Common specifications for high-voltage switchgear and controlgear standards
SS-EN 62271-102: High-voltage switchgear and controlgear - Part 102: - AC disconnectors and earthing switches
SS-EN 60529: Degrees of protection provided by enclosures (IP code)
SS-EN ISO 1461: Hot dip galvanized coatings on fabricated iron and steel articles
SS 3192: Hot dip galvanized threaded pieces of steel
SS 14 23 03: Stainless steel – SS steel 2303
SS 4210167: Design of outdoor substations - Wind and ice loads
SS-IEC 60168: Tests on indoor and outdoor post insulators of ceramic material or glass for systems with nominal voltages greater than 1000 V
SS-IEC 273: Characteristics of indoor and outdoor post insulators for systems with nominal voltages greater than 1000 V.
SS-EN 60437: Radio interference test on H.V. insulators
SS-EN 60507: Artificial pollution tests on H.V. insulators to be used on a.c. systems
IEC 62231: Composite station post insulators for substations with a.c. voltages greater than 1000 V up to 245 kV – Definitions, test methods and acceptance criteria.

Service conditions:
The lowest ambient temperature shall be -50° C.
At installation in dirty and/or salty environment reinforced requirements for corrosion protection, wash ability and creep distance of insulators will be specified.
For normal applications the wind pressure 700 Pa against a plane surface shall apply. For equipment in exposed locations, e.g. coastal or mountain areas, a higher wind pressure might be necessary. Dimensioning shall then be done with a wind pressure in accordance with SS 42101 67.

Some definition about Disconnect Switches used for power transmission and distribution systems
Rated voltage
The rated voltage indicates the upper limit of the highest voltage of systems for which the disconnector/earthing switch is intended. (same voltage as the highest voltage for equipment)
Rated value
A quantity value assigned, generally by the manufacturer, for a specified operating condition of a component, device or equipment. (IEV 151-04-03)
Nominal voltage of a system
A suitable approximate value of voltage used to designate or identify a system.
(IEV 601-01-21)
Highest voltage of equipment
The highest r.m.s phase-to-phase voltage for which the equipment is designed in respect of its insulation as well as other characteristics which relate to this voltage in the relevant equipment standards. (IEV 604-03-01)

According to Disconnect Switches used for power transmission and distribution systems, the dimensions are designed in accordance to the conditions, insulator properties and performance etc.

 

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Insulator end fitting
Power station post insulators
Indoor post insulators

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