Load switch VL

The disconnector HV, in fact, is a normal the disconnector with a simple interrupter chamber. They began to use about 60 years ago in the electrical systems 3, 6, 10 kV in cases where the use of expensive switches is uneconomical. In those times this switching the device was made in the form of high-voltage disconnector and fuse, since the load currents in electrical installations 6 - 10 kV were small in comparison with modern loads in the electrical network. In this combined, the isolator was designed to disable and enable currents idling and turn on load current, fuse fuse was given the role of protection of electrical installations against overload currents and short circuit.

Later improved this design by installation of a simple arc-quenching devices on the disconnector, developers came to create a new switching device, dubbed the load switch. As it turned out, these devices are cheaper disconnector power and is able to disable a fairly large capacitive currents running on idle power lines even very high voltage.

Load switch type NR consists of the following structural nodes:

- overall the frame is suspended on the support insulator,

- interrupter chamber with stationary contacts: main and arc,

movable contacts: main and arc,

- a common drive shaft associated with the poles insulating rods.

In the design of the arc chamber of the circuit breaker load type NR - includes two plastic cheeks, inside of which includes removable liners are made of plexiglass and forming a narrow gap in which moving arc contact. Switching "off" are two breaking springs, while between the interrupter contacts is formed electric arc, causing intense emission from the walls of the liners, and the increased pressure in the chamber. The path of the exit gases, namely through the crack between the pins and the walls of the chamber, passes through the region of arc burning at gases create longitudinal blowing and thereby extinguishing the arc. Arc chamber of the circuit breaker have a high degree of wear, i.e., designed for a large number of operations off (without replacement liner), for example, the power 50A allowed to disable 300 times the current 100A - 200 times the current 200A - 75 times, and the current 400A - 4 times. When disabling the first current path of the main working contacts, and then interrupter, when you enable this process on the contrary, when in the disabled state, the movable contact forms a fairly large visible gap.

On load break switches can be mounted fixed earthing knives, mechanical interlock to prevent erroneous action for the integration of the device.

Switches load VL is provided by the implementation operations on and off the load currents 200-400, as well As to protect against short circuit currents. Therefore, to perform assigned functions, the disconnector HV high voltage is supplied fused quartz.

Our company offers the following types of circuit breakers load:

- BH-16, HD-16, GNP-16, Wnps-16, BH-17, GNP-17,

- VNA, WPSA,

- IRR, IRR OF RA, IRR OF RA/EL-POR,

- VAL, WPSA,

- EXT-RA.

Voltage 6-10kV, currents DOA, with earthing one of the two sides, end with fuses, and manual distortionofreality drives.