Vna Load Switch Indoor Gas Insulated for Switchgears

• Customization: Available
• Type: High-voltage
• Structure: Three-column Disconnector
• Model NO.: VNA
• Installation: Indoor High-voltage
• Operation: Manual
• Grounding Mode: Grounding
• Movement Mode: Horizontal Rotary Type
• Number of Poles: Three Pole
• Grounding: Single Ground
• Series: Three
• Run: Turn the Horizontal
• Switching Mode: Single Throw-in
• Common Model: Vna
• Structure of Operating: Manual
• Certification: ISO9001
• Brand: Custom-Made
• Rated Voltage: 10kv
• Rated Current: 400,630A
• Rated Short-Circuit Current, a: 400,630A
• Rated Operating Voltage: 20ka
• Transport Package: Carton Packing
• Specification: 1200*480*650mm
• Trademark: Degatech
• Origin: China
• HS Code: 8535309090
• Production Capacity: 10000/M

Product Description

The gas-insulated load switches of type VNA-10 are designed for switching on and off under load sections of electrical circuits with three-phase alternating current rated at 400 A and 630 A, with a frequency of 50-60 Hz, and a nominal voltage of up to 10 kV. They also provide safe operation for maintenance work on the de-energized section using stationary grounding devices.

The PRBD-10 drive is intended for manual operation of the switch. In the off position, the VNA-10 creates a visible break in the electrical circuit, similar to a regular isolator. When disconnected, an arc forms between the arc-extinguishing contacts. Due to the high temperature of the arc, polymethyl methacrylate releases a large amount of gases, which extinguish the arc.

When closing, the arc-extinguishing contacts are closed first, followed by the main contacts. When opening, the main contacts are opened first, followed by the arc-extinguishing contacts.

The VNA includes a locking mechanism that prevents the grounding blades from being closed when the switch is in the on position and vice versa. The blades are operated by a separate mechanical drive (PRBD) connected to the load switch via a mechanical transmission. The switch drive can be placed either on the right (P) or on the left (L) relative to the main shaft of the switch.

Load switches with a rated current of 400 A are made with polymer insulators IOLp-10; those rated at 630 A use porcelain insulators IOR-10-3.75. At the customer's request, a device with a rated current of 630 A can also be manufactured with polymer insulators.
 

Name of parameters	Parameter value
Rated voltage Unom, kV	10
Rated operating voltage Unr, kV	12
Rated current, A	400, 630
The nominal initial value of the periodic component of the through short-circuit current Inp, kA	20
Rated tripping current, A	400, 630
Normative parameters of the through short-circuit current: maximum peak current (electrodynamic withstand current), kA; initial RMS value of the periodic component, kA; root mean square value of the current over its duration (thermal withstand current), kA; short-circuit current duration tkz , s.	51 20 20 1
Normalized parameters of inrush current: maximum peak, kA, initial RMS value of the periodic component, kA.	51 20
Switching capacity in normal operating conditions, VO.	10 cycles
The electrical resistance of the main current-carrying circuits in the closed position of the circuit breaker must not exceed, µΩ	100
The insulation resistance of movable and guiding parts made of organic materials must not be less than the specified values, MΩ	1000
Mechanical wear resistance, cycles (on-off-random pause) not less than.	2000
Power consumed by the device per pole.	Power consumed by the device per pole.