Cable Burn Down Equipment CBD7



Cable Burn Down Equipment CBD7 is applied in typical medium and high resistance faults that are beyond the range of applying Pulse Echo equipment for pre-location measurement.

A carbon bridge is produced by burning the cable insulation at fault point, which helps in locating the fault distance easily. 

They are also used for conditioning unstable faults such as ingress of moisture. In case of flame proof cables (such as PE/XLPE) it can be used to dry wet cable faults. It is the most suitable equipment, offering up to 7 kVA energy for above application for any type and grade of HT/LT cable.

Burn down process is controlled by selection of voltage range selection and continuous variation with variac.



It is used to burn down unstable, medium and high resistance faults for to per-location using normal ordinary TDR unit or it can be used to dry wet cable faults in transmission and distribution power cable network.




Both AC and DC range for burning operation.


Six selectable ranges for easy operation.


Burn down medium, high resistance and unstable faults to become in fault condition


High current output, suitable for drying long wet cables under controlled condition.


Safety interlocks for safe operation.


Maximum burn down voltage of 14 kV DC.


Maximum burn down current.


Burn current continuously monitor on analogue moving coil current meter.


Mains input current circuit protection.


Automatic discharge facility after switch off or in case of switching off or power failure.


Emergency switch off facility.


Fully protected operation with safety interlocks.


Rugged construction and easy to carry on site.


Working Principle

Highest voltage range is selected to ignite the fault on cable under test. The range is gradually lowered to get burn down at lowest voltage range a carbon bridge is formed across the fault after burn down. This helps in using ordinary PE/TDR equipment to get the fault distance. Carbon Bridge is blown out by high energy surges during pin-pointing. AC voltage ranges make it possible to carry out burning on LT mains supply cables. For drying wet section of a cable, the voltage has to be gradually increased to get voltage break down. The output can be controlled till there is no voltage breakdown.


It is use to burn down the high resistance or intermittent fault in power cables. It is basically a variable high voltage and high current power supply, have AC and DC ranges, which is connected across the fault through a high voltage selection solenoid. The output voltage is controlled through a Variac from zero to maximum.




Power Supply

230V AC +10% AC, 50 Hz, Single phase


Power Consumption

7 kVA max


Working Voltage Ranges

AC and DC


Output Voltage Ranges

60 V AC - 110 Amp
220 V AC - 30 Amp
1.2 kV DC - 6 Amp
4 kV DC - 1.5 Amp
8 kV DC - 0.8 Amp
14 kV DC - 0.5 Amp


Overload Protection

Magnetic shunt protection to limit input current for mains HV 

Mains input circuit bracker
Over temperature protection


Safety Protections

Variac zero interlocks
Output cable interlocks


Earth Discharge

Automatic and soft earth discharge



ON / OFF indications
Over heat LED indication
Burn current on moving coil analog current meter


Cooling System

Air cooled


Operating Temperature

0oC ~ 55oC


Storage Temperature

- 5oC ~ 60oC



540 (L) x 435 (W) x 600 (H) +Handle 55mm + Wheel 100mm



118 Kg Approx


Standard Accessories


10 sq mm single core screen output HV cable with heavy duty brass clamp 5 meter length.


Mains supply connecting cord 3 meter length.


Yellow/green earthling cable 5 meter length.


Standard Warranty - One Year

Other models available - Cable Burn Down Equipment CBD 2