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SWT 4PT Low Voltage Surge Tester

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Description
Occurrence of cable fault can not be avoided due to many factors. Long outage of a cable from service results in heavy loss of revenue to the power distribution company, production loss to industries as well as unpleasant condition to general.
This requires an efficient equipment capable of locating the fault and test cable in minimum possible time and restoring the supply.
In power cable fault location the vast majority of pin-pointing and cable test are carried out using a surge wave tester.
It is a powerful equipment and offers 500 Joules energy on 2 and 4 KV ranges, and DC high voltage (high pot) test which allows its use on LT networks effectively.
It is also used to pin-point the cable faults in power cables with the help of surge wave receiver and pre-locate cable fault distance with the help of suitable pre-locator unit in Impulse Current (ICM) mode.
It has an advance feature to connect arc reflection filter additionally to pre-locate fault distance on secondary impulse SIM / ARM mode with the help of suitable pre-locator unit
Application
It is used to pin-point underground cable faults in acoustic mode with the help of suitable surge wave receiver and to perform DC high voltage di-electric test up to 4 kV in power transmission and distribution cable networks.
Key Features
  • Three working mode Surge, ARF and DC high voltage (High-Pot) test.
  • Pin-point location of cable faults in Low voltage cables by acoustic method.
  • Perform Surge and DC high voltage test up to 4 kV.
  • Output voltage selectable in two ranges 2, 4 kV.
  • High energy of 500 Joules.
  • Full energy delivering capacity at each select range in SWT mode.
  • In-built Arc reflection filter
  • Cyclical pulse repetition for precise pin-pointing of cable faults in Acoustic Method.
  • Fully protected operation with safety interlocks.
  • Fully protected operation with safety interlocks.
  • Fully protected operation with safety interlocks.
  • Continues operation for extended period in case of pin-point difficult cable faults.
  • Rugged construction and easy to carry on site.
Working Principle
In surge mode ignites an arc or spark at the fault. This results in a transient, i.e. a spreading and repeatedly reflected traveling wave between the fault point and the connected end of LV Surge Tester. Inductive couplers record this transient wave with the help of a pre-locator unit and convert it into the fault distance.
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 point. The intensity of the noise and vibrations get attenuated during their travel to the ground surface. A sensitive surge wave receiver with ground microphone carried out on the cable route at the pre-located area and pin-point the exact spot of the fault in minimum time.
The HV DC test up to 4 kV is carried out to check the di- electric strength or insulation of cable on DC test mode. The respective voltage and leakage current is indicated on the meters.
Function
The LV Surge Tester used for fault pin-point location is basically a variable DC high voltage power supply, connected to a high voltage capacitor bank. The value of capacitance is usually selectable by parallel, series- parallel and series combination. This combination being linked with suitable high voltage taping to give the constant energy output on low voltage / high capacitance or high voltage / low capacitance in surge mode. In DC test mode the internal capacitor bank is isolated through a mode switch and DC high voltage is applied to the cable under test through a spark discharge device.
Standard Accessories
  • HV Output Cable 6 sq mm single core screen cable 20 meter length wound on drum with heavy duty clamp,
  • Mains supply cord 20 meter length wound on drum.
  • Yellow / Green 10 sq mm earthing cable 20 meter length wound on drum
Specifications
Working Mode Surge, ARF & DC Test
Surge Mode DC Test Mode
Output Ranges 0 - 2, 4 kV selectable & continuously variable
Output Energy 500 Joules full energy at each range
Impulse Mode Single and Auto
Auto Impulse Sequence 1.5, 3 and 6 seconds intervals or customer request
Indication ON / OFF lamp indication Analog moving coil meter for output voltage (kV) Indication Over Temp Trip LED indication
Cooling System Air Cooled
Earth Discharge Soft and automatic discharge
ARF / SIM Mode Working Voltage 4kV max 500Joules
Degree of Protection IP 51 (Top & Back ap closed)
Output Voltage 4 kV
Output Current 5 & 10 mA
Indication Analog moving coil meter for output voltage (kV) Indication Analog moving coil meter for output current (mA) Indication Over Current Trip LED indication
Burn 30mA @ 4kV
Power Supply 230V AC + 10%, 50 Hz, Single phase
Safety Variac zero inter-lock
Protections Protections
Working Temp 0 Deg C - 55 Deg C
Storage Temp - 5 Deg C - 60 Deg C
Dimensions 540(L) x 420(W) x 600(H) mm +HandIe 55mm + Wheel 100mm
Weight 95 Kg Approx