What is the function of Switchgear in Substation?

[tipu_sultan]

I think its main function is to reduce arc flash.
But I want to know how it is connect with the transformer before or after.
Can anyone explain it through the block diagram?

If HV power lines enter in the substation first it connect to which one and after that which one ? [Switch gear, Transformer].

Is the input and output voltage & current of switchgear remains the same?

 

[Bobbywhy]

tipu_sultan,

No member here on Physics Forums will spoon-feed knowledge to others. You must show some effort to find the answers first. Then, if you get confused, or don't understand some details, come here and ask. Members here are always ready and willing to help any true "searcher".

I suggest you open "Google" and enter the search terms "function of switchgear in substation" and begin your lessons.

Bobbywhy

 

[pocho]

hello, take a look on this link:

http://www.energy.siemens.com/hq/pool/hq/energy-topics/power engineering guide/PEG_70_KAP_03.pdf

you have some typical single line diagrams for substations.main link to Guide:

http://www.energy.siemens.com/hq/en/energy-topics/publications/power-engineering-guide/

main functions are to provide automated fault protection, manual switching of power lines and devices, and to provide safety conditions (isolating, grounding) on equipment before service.

 

[Okefenokee]

I've worked on these. It's really just a simple switch. Electrically it's no different than a light switch in your home. It typically has more poles of course for 3 phase power. Some of them can also break the neutral line as well (4 pole single throw).

What sets it apart is that switch gears are designed for large currents and voltages. The conductors in the switch are larger so that they can handle larger currents. Insulation is more robust to account for higher voltages. They also have a gear action and springs for the actual switching. A switchgear either slams shut or slams open. They're loud. It can take a little muscle to open and close a big switchgear.

Switchgears are typically installed immediately after the step-down transformer and before the breaker panel in commercial, industrial, or distribution services. The switch allows you to completely deenergize a service for maintenance purposes.

 

[alphy]

The main function of switchgear in a substation is to control and protect the electrical equipment, such as transformers, from overloading or short circuits. This is achieved by isolating faulty equipment and redirecting the flow of electricity to alternate paths. In addition, switchgear also helps in maintaining the proper voltage levels in the substation.

In terms of its connection with the transformer, switchgear is typically connected after the transformer. This is because the transformer steps down the high voltage from the power lines to a lower voltage that can be safely handled by the switchgear. The switchgear then distributes this lower voltage to various equipment within the substation.

To better understand the connection between switchgear and the transformer, it can be explained through a block diagram. The transformer would be connected to the switchgear through a set of high voltage cables. The switchgear would then have various components such as circuit breakers, fuses, and disconnect switches that are connected to the transformer and other equipment in the substation.

The input and output voltage and current of switchgear can vary depending on the type of equipment connected to it. For example, the input voltage from the transformer may be higher than the output voltage to the equipment, as the switchgear may have a voltage step-down function. Similarly, the output current may also vary depending on the load connected to the switchgear.