G - Physics
01
R
324/58.01
G01R 31/02 (2006.01) G01R 19/145 (2006.01)
Patent
CA 1134446
ABSTRACT OF THE DISCLOSURE A portable cable tester is used to test electrical cables between transformers of an electrical power distri- bution system. The cable tester has a cylindrical housing with an elongated electrically conductive prod at one end for insertion into a receptacle connected to one conductor of the cable. The second end of the housing has an on/ off switch, a second terminal, and an annunciator, which is preferably in the form of spark gap electrodes. The cable tester includes a capacitor (or capacitors) connected between the first and second terminals and charging circuit- ry for charging the capacitor. In use, the elongated prod is inserted into the receptacle connected to the one conductor, and the second terminal is connected to the other conductor of the cable. The on/off switch is turned on, and charging of the capacitor or capacitors is commenced. When the voltage across the capacitor attains a threshold value, the annunciator is actuated. In the event that there is a fault in the cable such as a short between the inner and outer conductors, the voltage across the capacitor cannot attain the threshhold value, and the annunciator is not actuated, thereby giving an indication of a faulty cable.
348465
Marks & Clerk
Trihus Axicor T.
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