The resulting chart recorder trace for a broken wire 

 fault will appear as in Fig. 3.5. 



The resulting chart record of Fig. 3.5 is typical of a 

 short dipole type of defect where dl is small. Defects 

 of this type are wire breaks , deep wire nicks , and 

 corrosion pitting. Wires which are missing in a cable 

 will produce a dipole which has a very large value for 

 dl. This will serve to stretch out the zero crossing 

 shown in Fig. 3.5 so that it will appear as in Fig. 3.6 



Fig. 3.5 Chart 

 record of broken 



Fig. 3.6 Chart 

 record of broken 

 wire with a large 

 value of dl . 



An example of a missing wire is shown in Fig. 3.7 



A-U 



