Application of Load Breake Switch 33KV

The 33kv pole mounted switch is made of a proven rugged, corrosion-resistant material (304L stainless steel plate for warships), ensuring a long service life (30 years) and a range of operations, with the characteristics ideal for on-column equipment.

Technical Parameters of 33KV SF6 Gas Load Breaker Switch

Products Type FWX-36

Basic Ratings

Maximum System Voltage 36kV

Rated Continuous Current 630A

Rated Frequency 50/60Hz

Short Time Withstand Current 16kA/1sec

Making and Breaking Capacity

Mainly Active Load Current 630A

Number of Load-break Operations 400times

Short-circuit Making Current (peak) 40kA

Number of Making Operations 5 times

Cable Charging Current 25A

Line Charging Current 1.5A

Closed Loop Circuit Current 630A

Transformer Magnetizing Current 22A

Power Frequency Withstand Current Test

Wet Condition-10sec Ph- Ph-Eth, Across Interrupters 70kV

DryCondition-1min，Ph- Ph, Phase to Earth 95kV

Dry Condition - 1 min Across Interrupter 110kV

Impulse Withstand Current Test( 1.2 x 50 µs )

Phase to Phase, Phase to Earth 195kV

Across Interrupter 215kV

Other Ratings & Specifications

Internal Arc Test 20kA /0.1 sec

Arc Extinction Medium SF6 Gas

Insulation Medium SF6 Gas

Creepage Distance (Porcelain) 1055mm

Creepage Distance (Silicon) 1550mm

Dry arcing distance ≥

IP Level 65

Operation Performance

Closing/Opening Time ＜1sec

Mechanical Operations (Guaranteed) 10000times

Operating Temperature (*Manual Type) -25～+70℃

Gas Pressure

Nominal Pressure (MPa, at 20°C) 0.07

Bursting Pressure (MPa) 0.4～0.6

Minimum Gas Pressure (MPa) 0.05

Leakage Rate (cc/ sec) ≤0.5%

Voltage sensors

CT ABC   10P10   5VA 400:05:00

Incoming side and outgoing side of the voltage sensor 6 Voltage sensor（built-in）                   

Phase voltage：（24（36）kV/√3）/（3.25V/√3）

Special attention should be paid to the voltage sensor, which must be directly fed by the 33KV load break interrupter switch. 

No additional adjustment circuit can be added to the controller. The voltage signal of the 33kv load break switch into the test line needs to be tested separately.

Gopower is one of the initiators and members of the Zhuhai Smart Grid Alliance.