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PRESENATION ON INSULATION CORDINATIONANDINSUALTION LEVEL OF SUBSTATION EQUIPMENTBilal Amin Ruikar0105ex101020Deepak Gandhi0105ex101024INSULATION COORDINATIONSelection of Insulation Strength consistent with expected Risk OF Failure

The correlation of the insulation of electrical equipment with the characteristics of protective devices such that the insulation is protected from excessive overvoltages.

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> Types Of CoordinationLine Insulation CoordinationStation Insulation Coordination1.Distribution lines

2.Transmission Lines

Line Insulation Coordination

Goals Of Line Insulation Coordination1.Clearance between Phase Conductor And Ground Conductor

2. Insulator String Length

3. Number Of and Type of Inslutors .

4.Need And Type Of Suppliment Grounding.

5.Phase to Phase Clearance.

6.Need For Location Of Surge Arrestor1.Generation Substations

2.Transmission Substations

3.Distribution SubstationsStation Insulation Coordination

Goals Station Insulation Coordination1.To Protect Substation From Over voltages

2. To Protect Substation From Natural Lightning.

3.To Protect From Switching Over Voltages.

4. To Protect From Impulsive Step Down Voltages.

Basic Impulse Insulation Levels (BIL)

> The Basic Impulse Insulation Levels refers to the ability of electric equipment such as transformers to withstand lightning surges. When lightning strikes a transmission line, a traveling wave is created. This traveling wave travels along the line and damages the transformer winding.

Surge arresters mounted on the line can reduce the surge, however they cannot totally eliminate it.Voltage surges can also be created by the switching of circuit breakers and switches.

> The BIL or the Basic Impulse Insulation level indicates the ability of the transformer to withstand these heavy surges. Transformers with a rating of 600 volts and below are designed to have a BIL of 10 kV.

ThankyouGuided by N. P Gupta Sir