ETL-250

SUBSTATION EQUIPMENT TEST VAN

ETL-250 is a van-mounted system designed for testing electrical substation equipment.

Apart from insulation withstand testing with DC voltage up to 60 kV and ability to indicate very small leakage currents, the system can be used for testing various substation objects with small electrical capacitance with AC voltage of up to 250 kV and measuring tangent delta (dielectric dissipation factor) at industrial frequency.

DC TESTING

ETL-250 allows to carry out withstand testing of electrical insulation with DC (rectified) high voltage up to 60 kV.

AC TESTING

Van-based cable fault and test system ETL-250 includes high-voltage step-up transformer allowing to test various objects with small electrical capacitance with AC voltage up to 250 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.

DIELECTRIC DISSIPATION FACTOR MEASUREMENT

ETL-250 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 or up to 250 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.

* Pictures used herein are for illustration purposes only. *


Connection Number of phases 1
DC testing Output current indication range 0 … 60 kV
Output current indication range

■ 0.01 … 3 mA, resolution 0.01 mA

■ 0 … 130 mA, resolution 0.1 mA

Indication Digital indication of output voltage and current in real time
Relative voltage and current indication error ± 3 % of full range
AC testing Output voltage adjustment and indication range 0 … 250 kV
Output current indication range 0 … 70 mA
Indication Digital indication of output voltage and current in real time
Relative voltage and current indication error ± 3 % of full range
Dielectric dissipation factor (Tangent Delta) measurement Measured values

■ Electrical capacitance

■ Tan δ

■ Operating voltage

■ Operating frequency

Measurement modes

■ Direct

■ Inverted

Measurement voltage up to 10 kV / 250kV
Maximum load capacitance

■ 64 nF @ 5 kV

■ 32 nF @ 10 kV

■ 890 nF @ 250 kV

Measurement error:  
■ Electrical capacitance ± 5*10-2 %
■ Tan δ ± (0,01*tan δ + 1*10-4)
■ Operating voltage ± 1,5 %
■ Operating frequency ± 0,1 Hz
Safety Isolation transformer 30 kV•A
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

High voltage presence signalling

■ Light signalling (optional)

■ Acoustic signalling (optional)

High voltage switch off

■ EMERGENCY STOP button

■ Power keylock switch

■ Open rear door monitoring

Power supply and consumption Mains supply voltage 230 VAC, ± 10 %
Mains supply frequency 50 Hz
Power consumption up to 30 kV•A

 

* Products specifications are subject to change without notice. *


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