POWER-FEED SYSTEM — NEWFOUNDLAND-NOVA SCOTIA LINK 281 



tic over the range CAB is controlled by a voltage-sensitive circuit con- 

 nected near the output of the equipment, and the stability of the charac- 

 teristic against input \'oltage and component aging is the same as for 

 the master characteristic. Changes in the distribution of the system 

 potential due to supply variations and component aging are therefore 

 small. 



Overall Current and Voltage Distribution 



Facilities have been provided at the j unction of the land and sea cables 

 (Terrenceville) to connect a power ground to the center conductor of the 

 cable. Normally this ground will be disconnected, but during installation 

 it enables the land and sea sections to be energized separately and may 

 subsequently be of assistance in the localization of cable faults near 

 Terrenceville. 



The full line in Fig. 2 shows the current path with normal double-end 

 feeding, while the broken lines show the current paths when a ground is 

 connected at Terrenceville. 



The full line (d) in Fig. 3 shows the voltage distribution along the link 



2500 



SYDNEY MINES 



TERRENCEVILLE 



CLARENVILLE 



Fig. 3 — Potential distribution on Clarenville-Sydney Mines link, (a) Single- 

 end feeding from Sydney Mines, (b) Single-end feeding from Clarenville. (c) 

 Ground at Terrenceville; double-end feeding, (d) Normal operation; double- 

 end feeding. 



