CTI comparative tracking index
Laboratory > Electricals
| Comparative Tracking Index (CTI; ASTM D3638) | |
Comparative monitoring index is used for the determination of the comparative monitoring index of solid electrical insulating materials in fragments taken from the parts of electrical and electronic equipment and plates of material by alternating voltages. The tracking index allows obtaining the comparative monitoring index CTI, which represents the maximum voltage (Volts) at which the material under test supports 50 drops of 0.1% ammonium chloride. without the generation of conductive roads to humidity, pollution and electrical stress. Tracking index test procedure according to IEC60112 In a plastics material plate, 2 electrodes are applied with an adjustable test voltage between 100 and 1000 V. 50 drops of a water solution with 0.1% ammonium chloride are applied between the electrodes and the voltage is gradually increased. The fault criterion is a cutting current ≥0.5 A for a time> 2s. The thickness of 3 mm is considered representative of the performance of the material in any thickness. |   |
The comparative tracking index or CTI is used to measure the electrical cutting properties (tracking) of an insulating material. It is an electrical fault on the surface of an insulating material in an initial exposure to the heat of the original insulator, which produces more current flow, more heat and, finally, complete failure. Expressed as a voltage that causes tracking after 50 drops of 0.1% ammonium chloride solution |  |