Cable Burn Down Equipment CBD7

 

Description

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.

 

Application

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.

 

Features

 

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.

Function

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.

 

Specifications

 

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

 

Indication

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

 

Dimension

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

 

Weight

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