Description
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Reference Norm
IEC 60112 – Procedures for determining the comparative and the Proof Tracking indexes of solid insulating materials under moist conditions.
Objective
This test procedures indicate the relative capacity of the solid insulating material to resist tracking at test tensions reaching up to 600V, when the surfice is exposed to water with ionic impurities, simultaneously with electric requirements/solicitación.
Definitions
- Tracking: Irreversible downgrading of an insulating material surface because of the formation of lines related to discharges that superficially start and develop. These lines are conductors even under dry conditions. Tracking can take place over surfaces which are in contact with air and also with interphases between different materials.
- Comparative Tracking Index (CTI): Numeric value of the maximun tension in volts for which the material can resist 50 drops deposition without tracking.
Equipment
- Platinum-point electrodes
- Variable tension up to 600 Vca
- 7-segement display tension index
- 0.6KVA Apparent power source
- Resistor Variable
- Regulates 1 A ± 0.1A current with shortcircuit electrodes
- Tension in the voltmetre does no drop more than 10%
- Overcharge relay (optional but not included)
- Programmable Dripping
- Valor por defecto/ Value by fault 1 drop every 30 seconds (± 0.5 seconds)
- Adjustable height
- Vol. of every drop between 20 and 23 mm3
Procedure
- Test tube protection from draft..
- Metal stand of adjustable height.
- Variable distance among electrodes.
- Programe controlled electolyte dripping frequency
- Programe controlled dripping quantity.
- Dripping count shown on intelligent display.
