What is insulation Coordination, why it is needed, it's defination, it's effect on power system, it's detailed information.
Electrical Abbreviations
full forms
Electrical Abbreviations
full forms
Why insulation coordination is required :
➤ There different protective devices is used to give protection against the over voltage. So there are required to make co-ordination between these components and protective devices, this is known as insulation co-ordination.
Definition of insulation co-ordination :
➤ In Short, Insulation coordination means co-relation between insulation of the various component of power system to the insulation of the protective devices which used for the protection of those equipment against over voltage.
➤ Some following points are considered in insulation co-ordination
(1) to study the possibility of over voltage coming due to lighting or the other way.
(2) to make use of suitable device to give protection against over voltage surge.
(3) to keep the protective device such that the protected equipment does not get damaged.
How insulation co-ordination use :
To achieve good insulation co-ordination, suitable co-ordination of the strength of insulation of line, switch gear, transformer, machine and the characteristics of protective devices like rod gap, lightning arrester, etc.is made.
Thus "Making suitable co-ordination of the capability of the equipment of withstanding the impulse voltage the protection characteristic of the surge arresters is called the insulation co-ordination."
In figure (a) you can see the system protected by arrester.
fig. (a)
In figure (b), the insulation characteristic of the equipment and that of the protective device are given. Characteristic of the equipment is shown by curve P and the co-ordination curve of the protective device is shown by curve Q.
From the curve it is seen that the insulation characteristic of the equipment is much higher than that of the protective device. So when over voltage surge comes, the spark over will take place first in the lighting arrester.
Now you can see in figure the characteristics of insulation is give , where
Y-axis show crest value in kV
X-axis show the time in second
( P ) insulation characteristic for power system
( Q ) Insulation characteristics of protective devices
(1) to study the possibility of over voltage coming due to lighting or the other way.
(2) to make use of suitable device to give protection against over voltage surge.
(3) to keep the protective device such that the protected equipment does not get damaged.
How insulation co-ordination use :
To achieve good insulation co-ordination, suitable co-ordination of the strength of insulation of line, switch gear, transformer, machine and the characteristics of protective devices like rod gap, lightning arrester, etc.is made.
Thus "Making suitable co-ordination of the capability of the equipment of withstanding the impulse voltage the protection characteristic of the surge arresters is called the insulation co-ordination."
In figure (a) you can see the system protected by arrester.
In figure (b), the insulation characteristic of the equipment and that of the protective device are given. Characteristic of the equipment is shown by curve P and the co-ordination curve of the protective device is shown by curve Q.
From the curve it is seen that the insulation characteristic of the equipment is much higher than that of the protective device. So when over voltage surge comes, the spark over will take place first in the lighting arrester.
Now you can see in figure the characteristics of insulation is give , where
Y-axis show crest value in kV
X-axis show the time in second
( P ) insulation characteristic for power system
( Q ) Insulation characteristics of protective devices
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