Network protector

A network protector (also reverse-power relay) is a type of electric protective device used in
 electricity distribution systems.

 The function of the network protector is to automatically connect and disconnect its associated
 power transformer from the

 secondary network when the power starts flowing in reverse direction. They are applied on both
 spot networks and grid networks.

Typically the network protector is set to close when the voltage difference and phase angle are
 such that the transformer will

 supply power to the secondary grid. Conversely the network protector is set to open when the
 voltage difference and phasing 

angle is such that the secondary grid would back-feed through the transformer and supply power 

to the primary circuit.A network protector structurally consists of three main parts: the housing,

 the mechanism, anda relaysetup. The housing holds the mechanism in place, encloses the

 protector mechanism and relay to prevent damageand tampering with the network protector.

 The mechanism contains electrical and mechanical parts to switch open andclose the secondary

 contacts. Finally, the relay is the 'brains' behind the network protector, monitoring various

 electricalconditions using sensors, and controlling the mechanism through electrical signals.

The device uses a power/timecurve so that benignback-flows (e.g. elevators) do not trip out circuits.

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Price                      : 450 Rs/- Only

Contact                  : Balaji Computer`s 

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