T&R Z-OVR Operating And Maintenance Manual Download Page 3

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SAFETY TERMS AND SYMBOLS

The following safety symbols appear on the equipment:

CAUTION/WARNING – Refer to manual

Mains off

Mains on

The following safety symbols appear in this manual:

CAUTION

This action or procedure may be dangerous if not carried out
correctly and may cause damage to the equipment or
connected equipment.

WARNING

This action or procedure may cause injury or death to the
operator or other personnel if not carried out correctly using
applicable safety procedures.

Note

This is useful information that may make testing easier, help
in interpretation of results or prevent confusion.

Summary of Contents for Z-OVR

Page 1: ...able Impedance Test System Type Z OVR Software version 1 04 DESIGNED AND MANUFACTURED BY T R Test Equipment Limited 15 16 Woodbridge Meadows Guildford Surrey GU1 1BJ United Kingdom Telephone 01483 207428 e mail sales trtest com Web www trtest com ...

Page 2: ...local earth Ensure that the unit is properly grounded before making any connections to inputs or outputs Terminal ratings must be observed to prevent fire hazards and risk of injury to the operator Consult the product manual for ratings information before making connections to any terminal It is ESSENTIAL to consult the product manual for rating information before making any connection to a termin...

Page 3: ...tion or procedure may be dangerous if not carried out correctly and may cause damage to the equipment or connected equipment WARNING This action or procedure may cause injury or death to the operator or other personnel if not carried out correctly using applicable safety procedures Note This is useful information that may make testing easier help in interpretation of results or prevent confusion ...

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Page 5: ...uirements 13 1 2 3 Cables14 1 2 4 System connections 17 1 2 5 Overload protection 18 1 3 Functions 18 1 3 1 Output18 1 3 2 Metering 19 1 3 5 Result storage 23 2 THEORY OF OPERATION 26 2 1 Kelvin connection 26 2 2 Impedance testing 27 2 3 Phase reversal to avoid interference 28 3 OPERATION 29 3 1 Setting up 29 3 1 1 System connections 30 3 1 2 Line connections 30 3 2 Testing 33 3 3 After Testing 34...

Page 6: ...7 5 1 Spare Fuses Supplied 37 5 2 Standard Accessories Supplied 37 6 OVERALL PERFORMANCE SPECIFICATION 39 6 1 Insulation Resistance at 1000V DC 39 6 2 Applied Voltage Test 39 6 3 Accuracy of Instruments 39 6 3 1 Current metering 39 6 3 2 Voltage metering 39 6 3 3 Phase metering 39 7 REVISION 41 ...

Page 7: ...oltages All connections to the line are made via the output unit The system is supplied with three overhead line Kelvin clamps one earth Kelvin clamp one earth lead and all interconnecting and supply leads Three outputs are provided on the output unit 75V 80A 150V 40A and 300V 20A to allow a wide range of lines to be tested WARNING The Z OVR system must only be used on dead systems i e no external...

Page 8: ...8 B C D E S T F G H I J K L M N O P Q R 1 1 Panel layout and functions 1 1 1 Control unit Figure 1 1 Z OVR front panel A ...

Page 9: ...C printer connection J Main output control Sets output current K Output off button Switches output off Illuminates green to show that output is off L Output on pushbutton Switches output on Illuminates red to show that output is on M Adj digital pot Control to select values for result storage N Impedance measurement select Selects calculated value to display impedance frequency or harmonics O Stor...

Page 10: ...10 A B C D E F G H I J 1 1 2 Output unit Figure 1 2 Output unit front panel ...

Page 11: ...rrent output Note push connector to release before pulling to remove plug from socket E 150V 40A output socket Mid range current output Note push connector to release before pulling to remove plug from socket F 75V 80A output socket Lowest voltage highest current output Note push connector to release before pulling to remove plug from socket G Z OVR metering connection Metering control connection ...

Page 12: ...urrent Phase angle Voltage input Harmonic value 1 Harmonic value 2 Figure 1 3 Z OVR metering values 1 1 4 Warning messages Figure 1 4 Over current trip warning message When an over current or duty cycle trip occurs the green OFF pushbutton must be pressed to clear the trip condition Figure 1 5 Duty cycle trip warning message I V 10 00A 90 0 1 00V IMPEDANCE Z 100 0m X 100 0m I V 10 00A 90 0 1 00V F...

Page 13: ...ion environments Maximum altitude 2000m Temperature 0 C to 45 C operating 20 C to 60 C storage Relative humidity 90 non condensing Protection rating IP20 1 2 2 Supply requirements 230V 10 50 60Hz 1 phase 6 5kVA The unit is supplied fitted with a 32A CEE plug If it is necessary to fit a different plug the supply cable has the following core colours Earth Green yellow Live Brown Neutral Blue The equ...

Page 14: ...ly interconnection cables Length Purpose Mains supply cable 5m Supply to control unit Power interconnection cable 5m Connects output unit to control unit Metering interconnection cable 5m Connects output unit to control unit Earth cable 10m Connects output unit to safety earth ...

Page 15: ...erminated in 6mm connector 6mm voltage sense terminated in 4mm shrouded plug 10m Duplex lead fitted with Kelvin clamp for overhead line connection Max conductor size 80mm diameter 80A CAT I 300V Warning Output cable ground green 12mm current injection terminated in 6mm connector 6mm voltage sense terminated in 4mm shrouded plug 10m Duplex lead fitted with Kelvin clip Max jaw opening 27mm 80A CAT I...

Page 16: ... overhead lines An optional alternative set of phase leads is available for connection to other types of conductors and terminals using Kelvin clips as on the earth lead Phase A Kelvin clip leadpart number AX136 0007 Phase B Kelvin clip lead part number AX136 0008 Phase C Kelvin clip lead part number AX136 0009 ...

Page 17: ...17 1 2 4 System connections Figure 1 7 System connections ...

Page 18: ... on 15 min off Maximum current NLU75 80 75V 40A 80A 100A 150V 20A 40A 40A 300V 10A 20A 20A 100A available for short periods Each output is rated for a continuous current and for higher intermittent currents The maximum ON time for intermittent currents is enforced by the unit and the output will be switched off if the rating is exceeded The display will then show the following message until the gr...

Page 19: ...0 Voltmeter Three true rms voltage metering ranges are provided The range is set using the VOLTMETER switch on the control unit The voltage measuring input is isolated by a switched range VT The VT provides safety isolation from the line under test but has a relatively low input impedance on the 10V and 30V ranges Do not use the 10V or 30V range with test currents of less than 5A to maintain accur...

Page 20: ... is calculated by taking an FFT Fast Fourier Transform of both the current and voltage and calculating the phase difference between the fundamental components The phase angle of the current is measured relative to the voltage A phase angle of 90 would signify that the current is lagging the voltage by 90 an inductive load A phase angle of 90 would signify that the voltage is leading the current by...

Page 21: ...mpedance Z and reactance X are displayed The Z OVR can measure impedance in the range 2m to 3000 in five ranges The impedance range is automatically selected based on the calculated impedance and is always limited to four significant digits Note Grey shaded areas are out of range of the unit Figure 1 13 Z OVR impedance ranges I V 10 00A 90 0 1 00V IMPEDANCE Z 100 0m X 100 0m ...

Page 22: ...output current and measured voltage Select the harmonic to be displayed using the ADJ knob Harmonics may be displayed up to 31st harmonic Harmonic ranges are for indication only and are not calibrated I V 10 00A 90 0 1 00V FREQUENCY 50 00Hz I V 10 00A 90 0 1 00V Voltage Harmonics 3 0 0 4 0 0 I V 10 00A 90 0 1 00V Voltage Harmonics 1 200 0V 2 0 0 I V 10 00A 90 0 1 00V Voltage Harmonics 1 200 0V THD...

Page 23: ...and 1 3 5 1 Entering a comment Plug in the keyboard and USB memory key ensuring that each is plugged into the correct socket Set the STORE RESULT switch to COMMENT Type in your comment using the USB keyboard When you have finished press Enter on the keyboard to store the comment Comments are limited to 19 characters The comment will now be added to all stored results until the comment is changed o...

Page 24: ... data is of the following format Z OVR V0 01 C01 P1 A1 Time Date Amps Volts Phase Freq Hz Z mOhms X mOhms Comment 11 49 23 23 02 10 10 00 1 00 90 0 50 00 100 0 100 0 Comment 11 49 23 23 02 10 10 00 1 00 90 0 50 00 100 0 100 0 Comment 1 3 5 4 Folder structure The Z OVR creates a folder on the memory key called TRTEST Within this folder a new folder is created for each day on which testing is carrie...

Page 25: ...hen the output is switched off The file is in the form of two columns of data giving sampled current and voltage values at 60µs intervals The file covers a time period of 62ms The 0 06 in the 7th column of the 1st row gives the time between samples in ms 11 49 06 23 02 10 Sample Time ms 0 06 Current Voltage 0 001 0 03 0 001 0 04 0 001 0 02 0 002 0 04 0 004 0 04 0 001 0 03 0 004 0 04 1023 sample li...

Page 26: ...switch 2 THEORY OF OPERATION 2 1 Kelvin connection The Z OVR uses a Kelvin connection to remove the impedance of the current injection cables from the measured reading Current is injected through a 12mm core in the output cables and measured using a thinner core in the output cable Figure 2 1 Kelvin measurement All the connection clamps have a separate current injection contact and voltage measure...

Page 27: ...e impedance of a line or cable 1 Phase A to phase B 2 Phase B to phase C 3 Phase C to phase A 4 Phase A B and C connected in parallel to earth Each test is carried out with an earthed short fitted at the far end of the line to be tested Figure 2 3 Phase to phase test connections to control unit omitted for clarity ...

Page 28: ...shape The sequence components of the impedance can then be calculated from these results 2 3 Phase reversal to avoid interference If interference from a nearby powered circuit is suspected it is possible to check the level of this interference First carry out a test as above and note the results Reverse the connections to the output unit reverse the high current connections and also the voltage in...

Page 29: ...ithout first switching off the supply to the unit hazardous voltages are present on the output and the output clamps are not insulated Never break the high current output circuit when the output is switched on this may cause arcing The output unit output from the Z OVR control unit is ONLY for connection to a T R Test Equipment NLU75 80 output unit Do not attempt to connect PCU1 SP loading units T...

Page 30: ...trol unit and output unit 3 1 2 Line connections Connect all three phase connection clamps to the phases of the line under test and connect the earth injection lead to the base of the tower if testing overhead lines or suitable earth point for cables The earth connection is used for measuring the parallel impedance of all three phases to earth Connect the phase A lead to the 75V 80A terminal Conne...

Page 31: ...31 Figure 3 2 Phase A B test Figure 3 3 Phase B C test ...

Page 32: ...32 Figure 3 4 Phase C A test Figure 3 5 Parallel test to earth ...

Page 33: ...s ensures that a very high current is not unintentionally injected and that a voltage too high for the currently selected voltage range is not applied Ensure that all personnel are clear of the cable Turn the output control to zero and press the ON pushbutton Increase the test current to the desired level watching the voltage to ensure that it does not exceed the voltage range selected If the line...

Page 34: ...On completion of the test switch off the output using the OFF pushbutton Return the output control to zero and switch off the supply Before disconnecting the test object ensure the mains supply switch is in the OFF position ...

Page 35: ...of usage particularly at very high currents However it should be remembered that damage to the output control can result if the brushes are allowed to wear away to such an extent that a loss of brush pressure occurs 4 2 Removal of the Z OVR from Case To remove the instrument from its case the following procedure should be used a Remove the 14 socket head screws securing each of the side panels to ...

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Page 37: ...ied a 5m supply cable fitted with 32A CEE plug b 5m power interconnecting lead c 5m metering control lead d Cable case to hold above leads e 10m safety earth lead f 3 x 10m output leads terminated in Kelvin line connection clamps g 1 x 10m earth output lead terminated in Kelvin clip h USB keyboard i USB memory key j User manual ...

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Page 39: ... to frame and all isolated outputs 2kVrms All isolated inputs outputs 3kVrms 6 3 Accuracy of Instruments 6 3 1 Current metering Metering range Metering full scale Resolution Accuracy 2A 2 000A 0 001A 1 rdg 5d 10A 10 00A 0 01A 1 rdg 5d 20A 20 00A 0 01A 1 rdg 5d 100A 100 0A 0 1A 1 rdg 5d 6 3 2 Voltage metering Voltmeter range Resolution Accuracy 10 00V 0 01V 1 rdg 5d 30 00V 0 01V 1 rdg 5d 300 0V 0 1...

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Page 41: ...41 7 REVISION Product Type Z OVR impedance system File Z OVR manual v1 doc Author M Clancy Issue Date 1 02 01 19 Checked By GB Date 28 01 19 ...

Page 42: ...42 Drawings Required A3 001778 latest issue Z OVR A3 001770 latest issue NLU75 80 ...

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