Indoor HV AC vacuum load switch combination appliance

Indoor high-voltage AC vacuum load switch-fuse combination(“combination” for short) is used in power systems with an AC frequency of 50 Hz and a rated voltage of 40.5 kV to break load currents, overload currents and short-circuit currents. It particularly applies to the places needing control, protection for oil-free, maintenance-free, frequently-operated and ring network power supply units and terminal power supply transformers.

General:

The combination is characterized by large breaking capacity, high safety and stability, long electrical life, support for frequent operation, less maintenance, etc. It has an apparent isolating gap, an earthing switch with making capability, an electric spring actuator and remote control capability.

Service Environment

Ambient temperature:-40℃-+40℃ (below 35℃ within 24 hours)
Relative humidity:≤95% (daily average) or ≤90% (monthly average)
Altitude:≤1000m
Key Feature
The combined electric apparatus is a three-pole linkage structure
The operation mode of the vacuum arc extinguishing chamber of the combined electric apparatus adopts the electric spring operating mechanism for closing, and the tripping electromagnet for opening, and can also be used for manual closing and opening
A reliable mechanical interlock device is installed between the vacuum interrupter, the isolation switch and the ground switch of the combined electric appliance, and the isolation switch and the ground switch are operated by the same shaft

Technical Data

Name		Unit	Data
Rated voltage		kV	40.5
Rated frequency		Hz	50
Rated maximum current of the fuse		A	63
Insulation level	1min power-frequency withstand voltage	kV	Vacuum gap, interpole, pole-to-ground: 95; isolating gap: 110
	Lightning impulse withstand voltage	kV	Vacuum gap, interpole, pole-to-ground: 185; isolating gap:215
Rated peak withstand current		kA	50
4s rated short-time withstand current		kA	20
Rated breaking current of the active load		A	1250
Rated closed-loop breaking current		A	1250
Rated breaking current of cable during charge		A	21
Rated short-circuit breaking current		kA	31.5
Rated transfer current		A	1200
Fuse model			XRNT3A-40.5/-31.5
Output energy of the fuse striker		J	2-5
Rated short-circuit making current		kA	80(expected peak value)
Rated peak withstand current of the earthing switch		kA	50
4s rated short-time withstand current of the earthing switch		kA	20
Rated voltage (DC or AC) of the auxiliary circuit		V	220;110
Mechanical life		Cycles	10000