Overview of Switchgears

Electricity and its application change the world in a very big way. Now a days the functions and applications of  electricity  advanced and wasted in different categories. Among that from the base of electrical power starting from power generation to power distribution, swichgear and protection plays vital effective role with respects to efficiency,  safety, power distribution, wide range of applications and with country standards.  Switchgear and protection become a important aspect of power system, as demand of electrical energy and consumption has increased very much. Electrical energy is much needed in almost every field and purposes like heating, lighting, industries, hospitals, domestic applications, and electric traction etc..

The apparatus and method use for switchingcontrolling and protection of the electrical circuits and equipment is known as switchgear and protection.

Switchgear is a general term which uses to covers the switching device and its various combinations with some associated control, measuring all parameter, protective and regulating equipment, together with accessories, enclosures and supporting structures.

Applications

It’s  mainly applied in electrical circuits and systems from low voltage like domestic 220/240V applications to transmission networks up to 1100 kV. To set up this control system a wide range of technology is needed and this chapter is split into the four main subdivisions of low voltage, medium voltage (Distribution Systemhttps://expressworld.international/), high voltage (Transmission System) and DC.

SWITCHGEAR MAIN CLASSES OF EQUIPMENT ARE MENTIONED SHORTLY

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Disconnector: A disconnector is a kind of mechanical type switching device which in the open position provides a safe working gap in the electrical system which withstands the normal working system voltage and any kind of overvoltages which may occur.

Disconnector is able to open or close a circuit system if a negligible current is switched or if no significant change occurs in the voltage between the terminals of the poles. Currents can be carried for specified times in normal operating systems and under abnormal conditions.

Fuse and Switch: 

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A switch is a kind of mechanical device which is able to make, carry and interrupt current occurring under normal conditions in a circuit system and to close a circuit safely even if a fault is present in the system. A switch must, therefore, be able to close satisfactorily carrying a peak current corresponding to the short-circuit fault level and it must be able to carry this fault current for a specified period of time and usually, it should take one or three seconds.

fuse and a switch can be used in combination system with chosen ratings so that the fuse operates at currents in excess of the rated interrupting or breaking capacity of the switch during the fault. This kind of device is known as a Fuse Switch if the fuse holder is also used as part of the main moving contact assembly or a Switch Fuse if the fuse is a separate and static part of an assembly which includes the switch connected in series.

Circuit Breaker: 

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circuit breaker is a mechanical type switching device which is not only able to make contact, carry and interrupt currents occurring in the circuit system under normal conditions but also to carry for a specified period of time and to make an interrupt currents arising in the system under defined type of abnormal conditions like short circuits.

Circuit Breaker use to experiences the most onerous of all the switching duties and it is a key device in many important switching and protection systems.

Earthing Switch: 

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An earthing switch is a mechanical type device for the earthing and short-circuiting of circuits. Earthing switch is able to withstand currents for a specified time under the abnormal conditions but it is not required to carry normal service current. An earthing switch may also have short circuit making capacity.

Relays: 

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Relay is basically a device or switch which detects the fault in the system, then it provides the information to circuit breaker. So that a circuit breaker can operate to prevent the healthy parts from faulty section.

Primary side of a relay is connected to a current transformer. Secondary side of current transformer is connected to the operating coil of relay as shown in fig. below.

fuse and a switch can be used in combination system with chosen ratings so that the fuse operates at currents in excess of the rated interrupting or breaking capacity of the switch during the fault. This kind of device is known as a Fuse Switch if the fuse holder is also used as part of the main moving contact assembly or a Switch Fuse if the fuse is a separate and static part of an assembly which includes the switch connected in series.

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Published by Edison Anto

Compassionate in preaching, training, writing and creative with Innovations. Gained excellent knowledge in construction management, projects and portfolio, engineering, music etc.

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