Air insulated switchgear(AIS)

40.5kV Disconnector or Insolator (DS)

Disconnector (DS) or named as disconnect switch or isolator switch is used to ensure that an electrical circuit is completely de-energised for service or maintenance. Such switches are often found in electrical distribution and industrial applications, where machinery must have its source of driving power removed for adjustment or repair.

High-voltage isolation switches are used in electrical substations to allow isolation of apparatus such as circuit breakers, transformers, and transmission lines, for maintenance.

The disconnector is usually not intended for normal control of the circuit, but only for safety isolation.

Disconnector can be operated either manually or automatically (motorized disconnector).



According to its structure and wheter be equipped with earthing switch, the DS can be divided into various types: non earthing switch, left earthing switch, right earthing switch, double earthing switches.



Standards:

IEC-129-84 Disconnector and Earthing Switch

GB1985-2004 Disconnector

u00d8 It adopts external pressured contact-finger structure, treated with silver plated on its surface.

u00d8 New type contact head and finger, larger contacting area enables it to better heat dissipation, eliminate impact from skin effect, good self-cleaning and counter corrosion.

u00d8 Low operation noise

u00d8 High reliability

u00d8 Good heat radiation effect.

u00d8 Easy erection & free maintenance

Typical specification:

u00d8 Type: Horizontally-rotary

u00d8 Highest system voltage: 40.5kV

u00d8 Rated frequency: 50Hz

u00d8 Rated current: 2000,3150,4000,

u00d8 Rated peak withstand current(peak) for DS: 100,125KA

u00d8 Rated short time withstand current : 40/4, 50/3 KA/s

u00d8 Rated 1min power frequency withstand voltage(to earth):95kV

u00d8 Rated 1min power frequency withstand voltage(across open contact):118kV

u00d8 Rated lighting impulse withstand voltage(to earth): 185kv

u00d8 Rated lighting impulse withstand voltage(across open contact): 215kv

u00d8 Mechanical life: 3000times

It is suitable for control and protection of electrical power system, and can also be used as interconnected circuit breaker.

Skype: sandrine-ctss

e-mail: sandrine@china-power-transformer.com

www.china-power-transformer.com