Load Break DC Disconnectors
L.C. SWITCHGEAR LTD.
+44 (0)1273 770540

Load Break DC Disconnectors

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Load Break DC Disconnectors

Standard Range - 800 to 6300A - 1000V or 1500V DC

Construction

The load break switch consists of two separate switch units assembled along the same shaft and connected to the same drive mechanism:

The disconnector unit which is an assembly of knife blades and jaws, mounted in parallel. These carry the rated current of the switch.

The load break unit provides the final load interruption through arc quenching chambers. 

Features

Visible breaking with a large isolation distance because of the opening angle of 90deg.

Total separation of the current carrying and breaking functions. This allows the contacts to be specifically designed for these different requirements, resulting in stable temperature rise characteristics and high current breaking characteristics. 

Design

Insulating parts made from glass reinforced polyester.

Stainless steel springs, mechanism and clamps.

Silver plated thermal contacts and breaking contacts on silver discs

Thermal contacts with knife blades and jaws, providing:

a) Better electrical contact, the knife blades - jaws system provides two contact surfaces (one each side of the blade) unlike a contact point in a pressure system; therefore the temperature rise is reduced.

b) Better short circuit withstand current is obtained using the dynamic electric-force that results from the shape of the blades.

Applications 

Electric Traction

Subways, tramways, trolleybuses, and railways

Fixed equipment: distribution of power from substations and track sectioning

Rolling equipment: general breaking and disconnection of traction power

Hoists and Handling

Isolation of industrial cranes using DC electric motors

Inverters and Rectifiers

DC supply isolation of excitation circuits of generators.

Breaking and isolation, of either the rectifier or the inverter (isolation for repairing one unit without interruption of the others).

For the above applications, it is possible to isolate the DC and AC simultaneously with one operation.

 

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