Digital Cable Fault Locator for Power, Control and Telecom Cables buries underground. The modern electrical distribution systems are employing more & more underground power & control cables. These cables may develop faults now & then due to imperfections in the cable insulations, mechanical damages, water seepage & overloading etc. such of the faults which are usually difficult to pinpoint may be localized with our Digital Cable Fault Localizer.

It can pinpoint faults broadly categorized as:

• Medium/high resistance faults
• Open circuit fault
• Short circuit faults

Specifications:

• Max & min fault resistances : 0 Ohms to 10 meg Ohms as measured with a avo meter.
• Max cable length : 5 km for all cases.
• Accuracy : ± 5% or better.
• Type of cables : all type of underground Power, Control & Telecom cables.
• Power source : 1.2 Volts AAA battery

Features:

• Pin Points Fault in all underground cables.
• Useful for Power, Control & Telecom Cables
• Maximum Cable Length 5kms
• Accuracy ±5%
• Faults located can be Medium/High Resistance Faults, Open Circuit and Short Circuit faults
• Two Techniques used
• Potential Comparison Technique
• Capacitance Comparison Technique

Principle Of Operation:

Two techniques namely (1) Potential comparison technique & (2) Capacitance comparison technique are incorporated in this instrument.

Potential comparison technique:

Is used to locate all types of resistance and short circuit faults. The principal of operation is to measure the potential drop across the faulty section of the conductor through the fault resistance

Capacitance comparison technique:

This method can be used to locate open circuit fault only. This method is based on the principle that the cable behaves as a capacitor, the capacitance is uniformly distributed throughout the length of the cable and the capacitance per unit length is constant. The instrument measures capacitance indirectly by measuring the charge/discharge current through a fixed load.

This is done by impressing a square wave upon the cable & using a current detector, to measure the current. In principle, if a capacitance meter is used to measure capacitance between a, faulty core & a healthy core from P end and Q end, then the fault length from P end can be calculated as: Lp/D = Cp/(Cp - Cq) x 100

Where D is the total length of the cable and Cp and Cq are the capacitance values measured from P end & Q end. If a healthy pair of cores is available, then by measuring the capacitance from p end between a healthy core and the faulty core first and then by measuring capacitance between twohealthy cores, the fault distance from P end can be calculated by: Lp/D x Cp/Cd & Cd = Cp+Cq (Where Cd is the capacitance between healthy cores)
    
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