Low Cost Van System for HT cable

 

Description

Telemetrics make Van mounting cable fault locating system is a basic requirement of any power distribution network company. It is a very common fault locating power full system to localize underground any nature of cable faults in short time. The system is a mobile laboratory having required equipments available to the operator at a site. 
Van mounting cable fault locating system is a total solution for fault location in any type of power cables.

 

Pre-Location

After identifying the type of fault, pre-location of fault can be determined using the latest pre-location method TDR & ICM. In TDR method a narrow electromagnetic pulse with a fast rise time is sent in the cable that reflects back from the fault point / far end where the impedance was change. The distance to the fault is then computed and displayed on screen.
In ICM method the surge tester ignites an arc/spark at the fault point. This result in a transient waves i.e. a spreading and repeatedly reflected travelling wave between the fault and the surge tester. Inductive couplers record this transient wave with the help of a pre-locator unit and convert in to fault distance.

 

Dc Test

It is used to perform di-electric strength of insulation in the cable and prove the integrity to identify and confirm fault conditions with a maximum test voltage up to 32 kV and current 10 mA. 

 

Pin-Point

Surges of high energy are applied across the fault at the set voltage with suitable time interval for pin-pointing the exact spot of cable fault. These surges create noise and vibrations at the fault point. The intensity of the noise and vibrations get attenuated during their travel to the ground surface. A ground microphone and a sensitive surge wave receiver carried on the route of the cable at the pre-located area and pin-point the exact spot of the fault in minimum time.

 

Application

The Cable fault locating van system is used to perform DC high-pot test, pre-location and pin-point of underground cable fault. Pin-point of cable fault is carried out by acoustic with the help of suitable surge wave receiver in power transmission and distribution cable networks.

 

Working Principle

Surges of high energy are applied to the fault at the set voltage and time interval for pin-pointing the exact spot on the cable length. These surges create noise and vibrations at the fault site. The intensity of the noise and vibrations get attenuated during their travel to the ground surface. A ground microphone and a sensitive surge wave receiver carried on the route of the cable on the fault pre-located area and pin-pointed the exact spot of the fault in minimum time.
The high voltage DC test up to 32 kV is carried out to check the dielectric strength or insulation of cable on DC test mode. The respective voltage and leakage current is indicated on the meters.

 

Functions

The Control unit is an integrated central operator inter-face for all operational modes and provides the monitoring of the system and the integrated safety facilities. It enables an easy and quick operation of the system, prevents operational errors and reduces the fault location time considerably. All necessary selection of equipment, switching and operations such as pre-locations, high voltage test, and pin-pointing is carried out.

 

Safety

Telemetrics gives higher priority to safety of operating personnel. The van system is divided in two section, operator section and HV section. HV section is equipped with proper safe guards such as door interlocks, inbuilt auto discharge. Operator section has Emergency off control on control panel. External emergency off switch at a entrance door to switch off entire system in case of any emergency.

 

Features

 

Fast and precise cable fault location.

 

Modular test system with stand alone equipments and total test achievable from a single test station.

 

Latest pre-location TDR & ICM methods..

 

Comprehensive safety measures for optimum safety of operator.

 

Continues operation for extended period in case of pin-point difficult cable faults.

 

Safety earth monitoring system to provide operator safety.

 

Light weight, small, flexible receiver with high sensitive ground microphone for pin-point of cable fault.

 

Cable test / proof test by means of DC voltage up to 32 kV.

 

Optimized surge energy for switchable capacitors values for each range.

 

High surge energy of 1000 Joules with 8, 16 & 32 kV max output for easy to pin-point cable faults.

 

Full output energy delivering capacity of surge tester on each selected range.

 

Extended HV output up to 20 meters through heavy duty cable drum.

 

Fully protected operation with safety interlocks.

 

Specifications:

 

Surge Wave Tester SWT32D

 

Output Ranges

0-8, 16 and 32 kV selectable and continuously variable.

 

Energy Output

1000 Joules full Energy at each Range.

 

Impulse Mode

Single and Auto.

 

Auto impulse Sequence

1.5, 3, 6 Seconds intervals OR as per customer request.

 

Indication

a)On/off lamp indication.
b)Analog moving coil meter for output voltage (kV) Indication

 

Dc Test :

 

DC Test Voltage

0-32 kV selectable and continuously variable. 

 

Output Current

10 mA continuous.

 

Indication

LED trip indication for current trip, Analog moving coil meter for leakage current (mA)  Indication

 

Protection

a) Variac Zero inter-lock. 
b) HV Switch inter-lock. 
c) Over Heat Protection. 
d)Output cable plug

 

Earth Discharge

Soft automatic discharge through in-built solenoid

 

Dimensions

540(L) x 530(W) x 800(H) mm

 

Weight

130 Kg Approx

 

Cable fault pre-locator TFL6

 

Operating Mode                      

TDR and ICM

 

Voltage of transmitting pulse   

30V

 

Width of transmitting pulse      

40 ns - 3.56 μs

 

Voltage Withstand                

400V AC (50/60Hz)

 

Output impedance 

5 - 80 Ohm

 

Measuring Range

0–16 km (In 1,2,4,8 and 16 km selectable ranges)

 

Sampling rate

100MHz (10ns)

 

Resolution

a)TDR mode
≤±1m when detecting range ≤4 Km
≤±4m when detecting range 
4 Km 

b) ICM mode
≤±4m when detecting range ≤4 Km
≤±16m when detecting range
4 Km

 

 

Propagation velocity (VOP)

90-300 m/μs

 

Velocity of wave

90-300 m/μs

 

Number of echograms memories

50 memories.

 

Display

320 x 240 dots

 

Charging input supply voltage

110 – 265V AC,50Hz

 

Charger output voltage 

8.4V±10% DC

 

Operation time of rechargeable batteries

5 hours Approx

 

Dimensions

345 (L) × 290 (W) ×152 (H) mm

 

Weight

4.5 Kg Approx

Surge wave receiver SLE90

 

Power supply                       

1.5 V X 8 AA size batteries.

 

Operating Time   

More than 12 hrs. Continuous.

 

Working Channels      

Acoustic and magnetic.

 

Acoustic Channel              

Broad band filter 70 - 3000 Hz.

Magnetic Channel

9820 Hz, +/- 10 Hz bandwidth filter.

 

Indication

1) Dual LCD bar-graph display to indicate the levels of acoustic and Magnetic channels. 
2) Battery checks status.   
3) Peak hold signal level bar on LCD.

 

Gain

More than 90 dB for both magnetic and acoustic channels

 

Input Impendence

:500 Ohm for ground microphone.

 

Cable Drums

 

Output Impendence

500 Ohm for ground microphone.

 

Weight

1.5 kg. With batteries.

 

Dimensions

240 (L) x 80 (H)  x 190 (D) mm

 

Standard accessories

1) Ground microphone MIC–S 2) Headphone 3) Connecting cable 4) Caring stick.

 

 

HV output cable 

10 sq mm single core screen output HV cable with heavy duty Brass clamps 25 mtr.

 

Earth cable

16 sq mm single flexible PVC copper cable 25 mtr.

 

Mains Supply cable

6 sq mm single core flexible copper cable 25 mtr.

 

Standard Accessories

 

Hard Discharge rod

 

Earth spike

 

Cooling fan

 

Spear set

 

Multimeter

 

Insulation tester 5kv

 

Standard Warranty - One Year