CABLE FAULT LOCATORS
Cable FaultThe dielectric breakdown fault (hereinafter called fault) of the power cable is roughly divided into the ground fault, short-circuit fault and connection fault, and in some cases, two or more types of fault may be combined, and the fault may occur over many phases.
The ground-fault resistance after the ground-fault/short-circuit has a very wide range from low resistance of 0.1MΩ or higher. The high-resistance ground fault includes such a flashover fault that even in the burning work to apply high voltage to the faulty cable, only the arc charge occurs intermittently at the fault point and the ground-fault resistance does not decrease so easily.
In some disconnection fault cases, the resistance between conductors after the disconnection ranges from low resistance of several Ω to several tens of MΩ, and the ground fault occurs simulataneously. Thus, the power cable fault is varied and to locate them, it is important to make correct judgement on the fault condition and to select an optimum measuring instrument.
Mitsubishi Cable Industris, Ltd. has got a wide range of Fault Locators.
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