WHAT IS INSULATION CO-ORDINATION

~ Power systems have equipment operating at different voltage levels and each has a different level of voltage with stand.  

~ There are different types of protective equipment to provide protection against over voltage.

~  All of this needs to be coordinated.  

~ This is called emulation coordination.

~ The following issues are looked at in Isolation Co-ordination

~ To study the possibility of over voltage coming from lightning or any other way.

~ Use of appropriate protective device against over voltage surge. 

~ Keep the protective device in the system in such a way that the protected device is not damaged.

~ The characteristic of a protective device such as an arrester is properly coordinated.  

~ To do this, the strength of the insulation of the line, switch gear, transformer, machine, etc.

~ and the road gap, the ability to withstand the voltage impulses of the lightning equipment and the proper coordination of the protection characteristic of the surge arrester is called insulation co-ordination.

~  equipment that is protected against overvoltage by means of a lightning arrester.  

~  the insulation characteristic of the protective device and equipment.

~ The characteristic curve of the protective device is decimal from Q. 

~ While the characteristic curve of the equipment is decimal from P.  

~ From the characteristic it is known that the characteristic of the insulation of the equipment is much higher than the characteristic of the protective device.

~ This means that when the overvoltage occurs, the lightning arrester will spark over at a voltage lower than the tolerable voltage level of the insulation of the equipment.

~ The value of how much voltage the insulation of equipment can withstand without damage is called the insulation level of the equipment. 

~  And as shown: the first is the ability to withstand a certain type of impulse voltage (in kV) at a certain impulse withstand level and the second is the ability to bear the rms value of the power frequency wave voltage for one minute.  

~ Equipment designed for 1 kv.  So its impulse voltage level is 75 KV and its ability to withstand ms value of 1 minute power frequency voltage is 35 kv.