Tracking test instrument of tracking index (PTI) compared with tracking index (CTI) what's the difference?
According to IEC 60112:2003 definition:
Compared with tracking index (CTI) : five test samples and can withstand the test of 50 drop process does not produce the highest voltage tracking failure and continuous flame values. It also includes the material in a 100 drop test show the characteristics of the explanatory.
Proof tracking index (PTI) : five test sample can withstand the test of 50 drop process without tracking failure and continue testing voltage value of the flame.
Informally, CTI is material can withstand 50 drop test process and does not produce the highest voltage tracking failure; PTI is to specify a test voltage, then test to see material can withstand 50 under the voltage drop test process.
Resistant to tracking index used as accepted standards, can also be used for quality control of materials and components. Compared with tracking index is mainly used for the comparison of the basic features and characteristics of the said materials.
In many standards have reference tracking test results of CTI, PTI, KEPIN instrument of Chinese word is, CTI refers to solid insulation withstand 50 drops of electrolyte and no formation on the surface of the highest voltage value of tracking, PTI is solid insulation surface withstand 50 drop electrolyte without forming voltage value of the tracking. These have special standard GB4207 and IEC60112. Should be pointed out that under the system of IEC standard, on the material in the machine to use this index, is to determine the pollution levels (in other standards), each level is corresponding to the corresponding CTI or PTI values (depending on the machine standard reference conditions, there may be a small difference)
CTI is resistant to tracking index Comparativetrackingindex abbreviations, is a sign of leakage resistance index. In the applied voltage on the surface of the insulation condition, make the electrolytic liquid droplets fall on electrodes of the surface of the moulded part, evaluate the leakage failure does not occur until any voltage. According to the withstand voltage value from 0 to 5 grade. The smaller the number, the higher the leakage resistance.
PTI to ensure that the resistance to tracking index is Prooftrackingindex abbreviations. The same as the CTI test method itself. At present, for each pressure value from 0 to 5 grade. PTI and CTI differs: CTI voltage change, seeks the maximum pressure value of the material, to determine the index. The PTI is a point in the test voltage, saying only that point is tolerated live voltage. Hypothesis tracking experiment instrument PTI, in other words, the result is 150 v, is that the tracking performance of the material is 150 v, resistance and practice may be higher than the value also. On the other hand, due to CTI is maximum pressure value, will not have greater than BiaoZhuZhi strength.
