Audited Supplier
VNA-10/630-20z
High-voltage
Three-column Disconnector
Indoor High-voltage
Manual
Grounding
Horizontal Rotary Type
Three Pole
Single Ground
Three
Turn the Horizontal
Single Throw-in
Vna
Manual
IS9001
Custom-Made
10kv
400,630A
400,630A
20ka
ZGHQDL
Carton Packing
1200*480*650mm
China
8535309090
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.
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. | 400 А - 12,3 W 630 А - 21,8 W |
