ETL-35K
CABLE AND SUBSTATION EQUIPMENT TEST VAN
ETL-35K is a versatile multipurpose cable and substation test van with three-phase connection to electrical objects.
ETL-35K system has a multitude of applications in electrical equipment testing and maintenance: testing cable insulation with DC voltage up to 60 kV, detecting very small leakage currents during surge arrestors testing, high-voltage testing with AC voltage up to 100 kV at industrial frequency, tracing underground utilities, pre-locating and pinpointing cable faults, and measuring the capacitance and tangent delta of various electrical objects at industrial frequency.
ETL-35K is fitted with a collection of traditional and modern safety systems which ensure the comprehensive operator protection.
THREE-PHASE CONNECTION
ETL-35K allows to connect to up to three coble cores simultaneously with an option to select the desired core to be tested from the control panel.
Three-phase connection makes fault location quick, easy and safe – it enables phase comparative pre-location methods, yet does not require an operator to switch the connection cables.
DC & AC TESTING
Van-based cable fault and test system ETL-35K allows to carry out withstand insulation testing with high DC voltage up to 60 kV and high AC voltage up to 100 kV at industrial frequency (f = 50 Hz).
MEASURING LEAKAGE CURRENT OF SURGE ARRESTERS
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.
FAULT PRE-LOCATION
Detachable time-domain reflectometer RIF-9, supplied with the ETL-35K, is used for detecting and determining the distance to various types of faults in electrical power cables with the main pre‑location methods:
Low-voltage method
- TDR (time-domain reflectometry): low-resistance faults and breaks.
High-voltage methods
- ARC/ARC multi-shot (single impulse / multiple impulse arc reflection method): high-resistance and unstable faults.
- ICE (impulse current envelope method): high-resistance faults that cannot be converted to low-resistance ones by burning faulty insulation.
- DECAY (voltage wave oscillation method): faults with high breakdown voltage.
FAULT BURNING
ETL-35K is equipped with a powerful burn unit with output current up to 6 A in voltage ranges (0 … 1 kV / 5 kV / 10 kV / 20 kV), and 12 A current in the voltage range of (0 … 0.5 kV).
Burning allows to convert high-resistance faults into low-resistance ones, which makes it possible to subsequently apply pre-location and/or pinpointing methods for precise fault localisation.
SURGE WAVE GENERATOR WITH VOLTAGE LEVELS SWITCH
A surge wave generator with up to 2000 J surge energy is used in the ETL-35K 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 / 16 / 32 kV, which delivers maximum possible energy of the surge pulses.
CABLE TRACING AND PINPOINTING FAULTS BY INDUCTION METHOD
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.
DIELECTRIC DISSIPATION FACTOR MEASUREMENT
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.
SAFETY
All cable test vans of ETL family are equipped with all-round operator safety systems consisting of the following modules and devices:
Grounding
- ✓ Protective earthing of the equipment and van chassis
- ✓ Operating grounding
- ✓ Vehicle chassis potential monitoring
- ✓ Continuous grounding monitoring system
- ✓ Automatic discharge device
Protection
- ✓ Overvoltage
- ✓ Overcurrent
- ✓ Overheating
- ✓ Position monitoring of high-voltage switches
High voltage switch off
- ✓ EMERGENCY STOP button
- ✓ Power keylock switch
- ✓ Open rear door monitoring
