145 kV Isolator

Double break Isolator guaranteed technical particulars

Governing Std

IS 9921/IEC-129

Nominal voltage

11kV

22kV

33kV

66kV

110kV

132kV

220kV

Highest system voltage

12kV

24kV

36kV

72.50kV

123kV

145kV

245kV

Current rating

400 Amps to 2500 Amps

STC rating kA

25

25

30

30

40

40

40

duration of STC in sec.

1 or 3

3

3

3

3

3

3

Impulse withstand Voltage(kVp)

75/85

125/145

170/195

325/375

550/630

650/750

950/1050

power frequecy withstand(kV rms)

28/32

50/60

70/80

140/160

230/265

275/315

395/460

Insulator option

Stack post

Stack post

Stack post & solid core

Solid core

Solid core

Solid core

Solid core

solid core

Auxilliary options

Aux switch+Electrical Interlock+Gear mech+Motor operated mechanism

types of contact relief

Banging & Turn twist