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Protection equipment,disconnector

In the electrical systems, we should use Protection equipment to protect the electrical equipment operating, conductors which are not in short circuit and person safety, such as disconnector.

Protection equipment,disconnector

In electrical engineering, a disconnector, disconnect switch or isolator switch is used to ensure that an electrical circuit is completely de-energised for service or maintenance.

High-voltage isolation switches are used in electrical substations to allow isolation of apparatus such as circuit breakers, transformers, and transmission lines, for maintenance.

The disconnector is usually not intended for normal control of the circuit, but only for safety isolation. Disconnector can be operated either manually or automatically (motorized disconnector).

Unlike load break switches and circuit breakers, disconnectors lack a mechanism for suppression of electric arc, which occurs when conductors carrying high currents are electrically interrupted. Thus, they are off-load devices, intended to be opened only after current has been interrupted by some other control device.

Disconnectors have provisions for a padlock so that inadvertent operation is not possible (lockout-tagout). In high-voltage or complex systems, these padlocks may be part of a trapped-key interlock system to ensure proper sequence of operation.

Protection equipment is one of parts of electrical systems, which can be divided into surge arrester, drop-fuse out and disconnector etc.

 

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