150 kV CIRCUIT BREAKER

Manufacturer : ABB
Type of designation : HPL-170/ 31A1
Standard : IEC-56
Type of arc quenching medium : Sf6
Number of phases : 3
Frequency : 50 Hz
Nominal voltage : 150 kV
Highest system voltage : 170 kV
Rated continuous current : 3150 A
Short-time current rating : 40 kA ( 3 sec.)
Symmetrical short circuit at highest system-
voltage r.m.s. : 40kA
Short circuit making current at highest system-
voltage r.m.s. : 100 kA
Breaking capacity : 40 kA
Insulation class
~ Power frequency withstand voltage ( 1 min.) : 325 kV
~ Impulse withstand voltage
( 1.2/ 50 microsec. Fullwave) : 750 kV
Interrupting time : 3 cycle
Operating duty cycle
~ Nominal sequence : O-0.3s-CO-3min-CO
Operating times
~ Closing time : 40 ms
~ Opening time : 20 ms
~ Total break time : 40 ms
~ Dead time : 300 ms
First pole to clear factor : 1.5
Creepage distance
~ To ground : 5045 mm
~ Across contact gap : 4887 mm
Minimum clearance in air
, Between phase : 2500 mm
, Phase to earth : 2000 mm
, Live conductor to ground level : 4157 mm
, Live insulator to ground level : 2533 mm
Control voltage : 110-125 VDC
Type of operating mechanism : spring
Overall dimension of circuit breaker
~ Length : 5390 mm
~ Width : 500 mm
~ Height : 5672 mm