Insulator Type Tests

TYPE TESTS ON DISC INSULATOR UNITS & STRINGS

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TYPE TESTS ON DISC INSULATOR UNITS & STRINGS On single units Sl Nature of test no 1 Verification of dimensions Disc diameter Unit spacing Creepage distance

Reference: standard/document Approved drawing - do - do - do -









On string with hardware fittings Sl Nature of test no 1 PF voltage withstand (Wet) 2 SI voltage withstand (Wet (W et)) - only only on strin trings gs used for 400 kV & above 3 LI voltage withstand & flashover test (Dry) 4 Volt Voltag agee dist distri ribu buti tion on 5 Mechanical strength test 6

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ti

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Reference: standard/document Cl 10 of IEC 383-2 Cl 11 of IEC 383-2

Cl 9 of IEC 383-2 Powe Powerg rgri rid d tech tech spec specn n Powergrid tech specn P

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TYPE TEST PROCEDURE

TEST ON SINGLE UNITS 1) Verificat Verification ion of dimensio dimensions ns Following physical dimensions shall be checked on 10 samples in accordance with the drawing approved by Powergrid. a) Disc Disc diam diamet eter er b) Unit Unit spac spacin ing g c) Cree Creepa page ge dist distan ance ce









Unit spacing a) Reference standard b) Purp Purpos ose/ e/cr crit itic ical ally ly testing c) Test procedure d) Acce Accept ptan ance ce crit criter eria ia e) Instruments us used

Approved drawing of Influences the overall length of the string and hence the phase to ground clearances. Check th the ba ball pi pin to to ba ball pi pin di distance of of th the si single un unit & verify compliance with the drawing 120 120 kN kN – 145 145 +/+/- 4 mm, mm, 160 160 kN kN & 210 210 kN kN 170 170 +/+/- 5 mm. mm. Marking bl block & vernier he height ga gauge









Creepage distance a) Reference: standard b) Purp Purpos ose/ e/cr crit itic ical ally ly testing c) Test procedure

d) Acceptance criteria

Approved drawing of Influenc Influences es the electric electrical al per perform formance ance especial especially ly und under er pollution Using adhesive tape the shortest distance between the sock socket et cap cap & pin pin is meas measur ured ed acco accoun unti ting ng only only the the porcelain surface. Normal disc 120 kN – 315 mm + 60/- 0 160 kN – 330 mm + 40/- 0 Anti fog 120 kN – 430 mm + 60/- 0











Radial & axial run out a) Reference standard

Approved drawing









Gauge check for ball & socket coupling









2) Ther Thermal mal Mechan Mechanical ical perfor performanc mancee test a) Reference standard b) Purp Purpos ose/ e/cr crit itic ical ally ly

Powergrid tech specn & Cl 20 of IEC 383-1/93 of To check check the mech mechani anica call perfo perform rman ance ce of the the sample sampless

















3) PF Voltage Voltage flash flashover over & withstan withstand d test Dry condition ) R f

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d

IEC 383 1











































































































































































































Insulator Type Tests

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