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GFL-Series User Manual V1.1
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Figure 5-4 Tracing a Ground Fault using Two Clamps
5.6 Factors Affecting Fault Tracing.
5.6.1 Distributed Capacitance.
Wherever cables run close together there is a significant capacitance which allows a
leakage current to flow when AC voltage is present. Leakage capacitance is always
present and does not represent a fault condition. The current that flows through the
capacitance is out of phase with the resistive (i.e. fault) current and is therefore
rejected by the signal receiver. Leakage capacitance is measured by the GFL
– 1000
and the value shown in the display.
5.6.2 System Noise and Interference
Many systems will contain considerable interference from equipment that is operating.
The GFL
– 1000 will usually reject this noise by selective filtering. A Spectrum Analyzer
is available in the Signal Receiver to help identify levels and frequencies that may cause
problems, see Section 7.1.