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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 |
