PREZIOHM TFR is a portable system specially designed to measure impedance and resistance of transmission line tower footing without necessitating removal of top ground wire.PREZIOHM TFR has a wide measurement range (0to2k ohms) and is immune to power frequency interference and its harmonics. The instrument is designed to operate in a highly induced environment and to give highly stable, reliable, repeatable readings with its strong capability of noise & leakage current/ voltage suppression.
1.What is going to the earth resistance of any tower footing?
Ans. In the analysis, the common tower-footing resistance with the flashover (47. 7 or 10. 7 ) and the average tower footing resistance at towers no. 1-a hundred and forty (33. 3 or five. 6 ) are used, respectively.
2. What is tower footing impedance?
Ans. Tower footing impedance is the impedance offered by way of the metallic parts of the tower blended with the floor impedance to the dissipation of modern. The importance of a low value of tower footing impedance consequences in fewer voltage stresses across the line insulation.
3. What is the most everyday earth resistance allowed?
Ans. Ideally, a ground ought to be of 0 ohms resistance. There is not always one popular floor resistance threshold that is diagnosed by all agencies. But, the NFPA and IEEE have endorsed a floor resistance price of five. 0 ohms or less.