CABLE AND SUBSTATION EQUIPMENT TEST VANETL-35K is a versatile multipurpose cable and substation test van with three-phase connection to electrical test objects. ETL-35K system has a multitude of applications in electrical equipment testing and maintenance: testing cable insulation with DC (rectified) voltage up to 60 kV, measuring small leakage current of surge arrestors, high-voltage testing with AC voltage up to 100 kV at industrial frequency, underground utilities tracing, cable fault pre-location and pinpointing, and measuring capacitance and tan delta of various electrical objects at industrial frequency. ETL-35K is fitted with a collection of traditional and modern safety mechanism providing comprehensive operator protection operator.
ETL-35K features a three-phase connection method to the test objects and a phase switch on the operator panel for a specific phase selection.
Three-phase connection makes fault location quick, easy and safe – it enables phase comparative pre-location methods, yet does not require an operator switching the connection leads.
Van-based cable fault and test system ETL-35K allows to carry out withstand testing of cable insulation with DC (rectified) high voltage up to 60 kV and testing other electrical objects with AC voltage up to 100 kV at industrial frequency (f = 50 Hz).
A microammeter included with the system allows testing surge arresters with DC (rectified) voltage up to 60 kV and measuring the leakage current with up to 0.01 mA significance.
Detachable digital time-domain reflectometer RIF-9 included with the system is used for determining the distance to faults in electrical power cables with all the main pre-location methods:
ETL-35K is equipped with a powerful burn unit with output voltage level switch, used to convert high-resistance cable faults to low-resistance ones, which allows to subsequently apply pre-location and/or pinpointing methods for precise fault localisation.
ETL-35K burn unit provides output current up to 6 A at up to 20 kV voltage or output current up to 15 A at up to 0.5 kV voltage.
A surge wave generator with up to 2000 J surge energy is used for pinpointing cable faults with an acoustic method.
The generator is supplemented with a surge level switch allowing to select output voltage in the ranges of 0…8 / 0…16 / 0…32 kV, which delivers maximum possible energy of the surge pulses.
Cable test van ETL-35K can optionally be supplied with LFG-200 low frequency generator providing up to 200 VA of output signal power.
Addition of the generator, turns ETL-35K into a powerful system for underground utilities tracing, their burial depth determination and cable faults pinpointing by the induction method.
ETL-35K system can be equipped with an optional Tan Delta module for accurate measurement of capacitance and the dielectric dissipation factor at up to 10 kV voltage of industrial frequency.
Tan Delta measurement using cable test vans is most often used to assess the transformer insulators on the electrical substations.
All ETL-35K cable test vans are equipped with all-round operator safety systems consisting of the following modules and devices:
✓ Overvoltage and overcurrent protection.
✓ Overheating protection.
✓ Equipment and vehicle chassis protective earthing.
✓ Continuous grounding monitoring system.
✓ Emergency stop button.
✓ Automatic discharge device.
✓ Light and sound indication of high voltage.
✓ Vehicle high-voltage compartment door closure sensors.
✓ Safety ON/OFF keylock switch.
✓ Self-health and safety monitoring of high-voltage switches.