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T&R Z-OVR Cable Impedance Test Set
  • T&R Z-OVR Cable Impedance Test Set
  • T&R Z-OVR Cable Impedance Test Set
  • T&R Z-OVR Cable Impedance Test Set
  • T&R Z-OVR Cable Impedance Test Set

T&R Z-OVR Cable Impedance Test Set

T&R approved distributor and service centre.

Includes: T&R Z-OVR, 5m supply cable fitted with 32A CEE plug, 5m power interconnecting lead, 5m metering & control lead, Cable case to hold above leads, 10m safety earth lead, 3 x 10m output leads terminated in Kelvin line connection clamps, 1 x 10m earth output lead terminated in Kelvin clip, USB keyboard, USB memory key, User manual.

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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.


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
RangeFull ScaleResolutionAccuracy
Phase0 - ±180.0°0.1°±1°
Output Rating
Current Rating
OuputContinuous5 Min OnMaximum
75V - 80A40A80A80A
150V - 40A20A40A40A
300V - 20A10A20A20A
Protection & Safety
CE MarkedYes.
MeetsBS EN61010.
ProtectionElectronic trips on outputs.
Circuit Breakers on mains input and outputs.
Duty cycle trip on loading unit output.
Thermal protection.
StorageYes, on USB memory key.
Real-time clockYes.
Operating temperature0°C to 45°C.
Storage temperature-20°C to 60°C.
Supply requirements230V±10%
45-65Hz 1ph
7kVA max.
DimensionsZ-OVR: 450(w) x 275(h) x 305mm(d)
NLU75/80: 450(w) x 275(h) x 330mm(d).
WeightZ-OVR: 26 kg
NLU75/80: 50 kg.
T&R Z-OVR Warranty2 years.


T&R Z-OVR Datasheet

PDF specifications of the Z-OVR Cable Impedance Test Set

Download (2.58M)

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T&R Z-OVR Cable Impedance Test Set
TrolleyTrolley mounting system.A204-0005
Overhead LeadsetReplacement 10m Overhead Leadset. Supplied with Pelicase transport case.AX136-0010
Kelvin LeadsetReplacement 10m Kelvin Leadset. Supplied with Pelicase transport caseAX136-0011

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