HD CABLE FUALT TESTER

Cable Fault Tester for Use up to 35kV System Voltages (21kV Phase-to-Ground)

Cable Fault Tester
15, 25 and 35kV Class
For use only with two stick voltmeters
For testing leakage current in underground primary voltage cables
Used with a voltmeter/phaser for testing installed
Repaired underground cable prior to energizing

The CFT-35 is for use only with two stick voltmeters for testing leakage current in underground primary voltage cables.

The CFT-35 can be used on underground cables with grounded neutrals with a maximum line-to-ground voltage of 21.1kV or maximum line-to-line voltage of 36.6kV. Operation at higher voltages may damage the CFT-35 and provide erroneous test results.

The CFT-35 is used with a voltmeter/phaser for testing installed or repaired underground cable prior to energizing it. Only cable with extruded dielectric such as rubber or polyethylene can be tested with the CFT-35. Using the CFT-35 on paper insulated cable may provide erroneous test results caused by higher leakage currents typical for this type of cable.

In practice, the CFT-35 rectifies the high voltage from the source, usually a transformer primary, and charges up the cable,shown as a capacitor above. When a connection is first made, the DC from the CFT-35 will charge up the cable capacitance through the resistors in the meter sticks. If the cable is good, current will stop flowing when the cable is charged up. If the cable is not good, the cable will not charge and current will continue to flow, as indicated by a higher meter indication.