T&R Z-OVR Cable Impedance Test Set

The Z-OVR is a line/cable impedance measurement system for high voltage ac systems. The impedance of the line is measured by injecting a current and measuring the magnitude and phase angle of the voltage developed across the line. The resistance and reactance of the line are calculated from these results and displayed. The system uses a 4-wire measurement with a Kelvin connection to the line under test to eliminate measurement errors due to voltage drops in the leads. The system consists of a separate control unit containing all metering and control functions and an output unit that provides the high current output and isolation of measured voltages. All connections to the line are made via the output unit. The unit has data logging facilities using a standard USB memory key. Date, time, current, voltage, phase angle, and frequency are stored to a CSV file on the memory key along with a comment entered using the supplied USB keyboard. The Z-OVR system must only be used on ‘dead’ systems (i.e. no externally supplied voltages are present on the test object) with safety earths applied. FEATURES Measure impedance of overhead lines and underground cables. Direct readout of cable Z & X. Phase angle display. Voltage up to 300V. Current up to 80A. Data storage to CSV file on USB memory key. Digital true RMS memory ammeter & voltmeter. Solid state switching. Rugged, compact design. T&R Specifications Current/Voltage Ranges Range Full Scale Resolution Accuracy 2A 2.000A 0.001A +1%rgd+5d 10A 10.00A 0.01A +1%rgd+5d 20A 20.00A 0.01A +1%rgd+5d 100A 100.0A 0.1A +1%rgd+5d 30V 30.00V 0.01V +1%rgd+5d 300V 300.0V 0.1V +1%rgd+5d Phase 0 - +180.0° 0.1° +1° Output Rating Current Rating Ouput Continuous 5 Min On Maximum 75V - 80A 40A 80A 80A 150V - 40A 20A 40A 40A 300V - 20A 10A 20A 20A Protection & Safety CE Marked Yes. Meets BS EN61010. Protection Electronic trips on outputs. Circuit Breakers on mains input and outputs. Duty cycle trip on loading unit output. Thermal protection. Storage Yes, on USB memory key. Real-time clock Yes. Operating temperature 0°C to 45°C. Storage temperature -20°C to 60°C. Supply requirements 230V+10% 45-65Hz 1ph 7kVA max. Dimensions Z-OVR: 450(w) x 275(h) x 305mm(d) NLU75/80: 450(w) x 275(h) x 330mm(d). Weight Z-OVR: 26 kg NLU75/80: 50 kg. T&R Z-OVR Warranty 2 years.

For more information on T&R Z-OVR Cable Impedance Test Set talk to Cuthbertson Laird Group