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Specifications

HORIZONTAL DOUBLE BREAK TYPE ISOLATOR: (HDB)

     
HORIZONTAL DOUBLE BREAK TYPE ISOLATOR:  (HDB)

Double Break Isolators :
Type : DB

  • Turn & twist mechanism with self wiping contacts.
  • Fixed & moving blades are made out off hard drawn electrolytic copper
  • Simultaneous operation of three poles by individual/group with low operating torque
  • Type tested as per IS and IEC.
  • Suitable for all typical substation layouts.
  • Structures to suit requirements.
  • Motor/Manual operating mechanisms.
  • Terminal connectors of flexible/rigid suitable for horizontal/vertical take-off.
 
1
Rated voltage
kV
12
36
72.5
123
145
245
420
2
Rated Current
upto Amps
1250
4000
4000
4000
4000
4000
4000
3
Rated Short time withstand current
kA peak
25
31.5
40
40
40
40
40
4
Rated peak withstand current
kV rms
62.5
80
100
100
100
100
100
5
Power frequency withstand voltage
-
-
-
-
-
-
-
-
-
a) To earth
kV rms
28
70
140
230
275
460
520
-
b) Across isolating distance
kV rms
32
80
190
265
315
530
610
6
Lightning impulse withstand voltage 1.2/ 50  (micro sec.)  
-
-
-
-
-
-
-
-
-
a) To earth
kV peak
75
170
325
550
650
1050
1425
-
b) Across isolating distance
kV peak
85
195
375
630
750
1200
1425 (+240)
7
Switching impulse withstand voltage 250/ 2500 (micro sec)
-
-
-
-
-
-
-
-
 a) To earth
kV peak
 
-
 
-
 
-
 
-
 
-
 
-
1050
 b) Across isolating distance
kV peak
 
-
 
-
 
-
 
-
 
-
 
-
900 (+345)
 

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