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TESTING PLAN |
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Testing plan is divided into three types of tests. |
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Routine tests |
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To be carried out by the manufacturer on all the units, for which a routine test certificate will be supplied. |
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Acceptance tests |
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To be carried out on capacitors, the number of which is to be decided between the customer and the manufacturer mutually. |
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Type tests |
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Normally a certificate for the type test will be provided. However we can offer type tests on single unit at extra costs and with previous arrangement. |
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Routine Tests |
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A |
Visual examination |
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B |
Sealing test at 75 Degree C + 5 Degree C for 3 Hours. |
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C |
Test for output and capacitance. Capacitance will be measured directly across a Schering bridge. |
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D |
Voltage test between terminals.
Note : On subsequent repeated testing, test voltage applied will be equal to 80% of the above value. |
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E |
Voltage test between terminals and container.(Applicable for 2 terminal capacitors only.) An A.C. voltage will be applied as per table below between all the terminals together and body for the period of 1 minute. The capacitor will withstand this test. |
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Test Voltage Table |
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Rating of Capacitor (kV) |
AC Test Voltage KV |
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6 |
20 |
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12 |
28 |
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18 |
39 |
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28 |
48 |
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40 |
72 |
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Note: 1) When one terminal of capacitor is connected to body, this test does not apply. |
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F |
Test for efficacy of discharge device A D.C. Voltage equal to 1.41 times the r.m.s. rated voltage of capacitor will be applied along with its discharge resistance. The voltage will be switched off and time will be measured to reduce this voltage upto 50 volts. This time will be less than 5 minutes. |
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G |
Measurement of tangent of dielectric loss angle ( Tan delta) This will be measured across the Schering bridge at rated voltage. |
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Acceptance tests |
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All the routine tests are offered as acceptance tests. |
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Type tests |
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Following type test are identical to similar tests under routine test |
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A |
Test for capacitance. |
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B |
Voltage test between terminals and container |
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C |
Voltage test between terminals |
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D |
Measurement of tan delta. |
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E |
Thermal stability test will be carried out as per clause 9.3 of IS:11548. |
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F |
Tangent of dielectric loss angle at elevated temperature. Tan delta during the thermal Stability test at the voltage of the thermal Stability test will be as per declared value. |
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G |
Impulse Voltage test between all live terminals together and the container as per table and conditions of clause (f) in routine tests. |
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Partial discharge test A test certificate on similar sample will be offered.. |
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J |
Capacitance discharge test. A capacitor unit will be charged to D.C. voltage at twice the rated R.M.S. voltage and discharged through a gap situated as close to capacitor as possible without a current limiting resistance. Five such discharges will be carried out within an interval of 2 minutes between two shots. The unit has to withstand a voltage test between terminals after this test. Capacitance before and after this test will not vary by more than 2%. |
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