What is an isolator? How it's work? What are parts of an isolator?

What is definition of an isolator?

An isolator is a mechanical switching device that, in the open position, allows for isolation of the input and output of a device. An isolator differs from a switch in that it is intended to be opened when the circuit is not carrying current.

Figure of an Isolator

                 
What is the main function of an isolator?

It separates the circuit part in which the error takes place from the power supply. Isolators are applicable for high voltage devices like transformers. The main function of Isolator is, it blocks the DC signals & allows the AC signals to flow.

Types of isolator

There are different types of isolators used for different applications such as single-break isolator, double-break isolator, bus isolator, line isolator, etc.

Line isolator

But in Pakistan posting two type of isolator are use to line isolator and bus isolator,

Line isolator is use to break the circuit of current between line tower and grid station (power station)

Where a bus isolator is use to break the circuit of current between bus bar and transformer bay.

Working of an isolator

There is a handle Rod to operate isolator to on or off,
With the  help of handle rod you can switch off (opened) the blades of isolator, in this way your circuit of current is switched off and when you switch on (closed) the blades of isolator then your  circuit of current will be on

Isolator is on

Isolator is off

How many parts of isolator???

There are few parts of isolator
1) Isolator Postings
2) Isolator Arms
3) Isolator Stand
4) Isolator Electric Box
5) Isolator Earth Box
(Used in Line Isolator only)
6) Earth Rod
(Used in line isolator only)
7) Isolator Structural Stand
(Structural stand Mostly used in grid power station)