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Copyright HT ITALIA 2020

Release EN 2.03 - 11/11/2020

ENGLISH

User manual

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Summary of Contents for HN002055

Page 1: ... Copyright HT ITALIA 2020 Release EN 2 03 11 11 2020 ENGLISH User manual ...

Page 2: ...2055S UNIT 12 6 1 Settings 12 6 1 1 Default settings 12 6 1 2 Setting output power 13 6 1 3 Setting alarm condition 13 6 2 Adjust contrast of display 14 6 3 Help screens 14 6 4 Messages at display 14 7 HOW TO PERFORM THE MEASUREMENTS 15 7 1 Theory of Step Contact voltage measurements 15 7 2 Step Contact voltage measurement 16 7 3 Earth resistance measurement 21 7 4 Ground resistivity measurement 2...

Page 3: ...en measuring voltages above 25V in special environments building yards swimming pools etc and 50V in ordinary environments as there is danger of electric shocks In this manual and on the instrument the following symbols are used WARNING Observe the instructions reported in the manual An improper use could damage the instrument and lead to dangerous situations for the operator AC voltage or current...

Page 4: ...e divided into the following measurement categories Measurement category IV is for measurements performed at the source of a low voltage installation Examples are electric counters and measurements on primary devices protecting against overcurrents and on ripple adjusting units Measurement category III is for measurements performed on installations inside buildings Examples are measurements perfor...

Page 5: ...ontact voltage measurement with test current of max 55A Earth resistance measurement with 4 wire method Ground resistivity measurement with Wenner method Use of metal plates for step contact voltage measurement Initial synchronizing for autonomous use of the meter unit DSP internal filtering for compensation of disturbance effect on the measurement Internal memory for saving test USB interface for...

Page 6: ...rechargeable batteries which are recharged from the mains by means of a battery charger supplied as standard accessory The use of 6x1 5V type AA LR6 alkaline batteries is also possible for this unit The symbol indicates that the batteries are low and must be recharged To recharge or replace the batteries follow the instructions given in 10 1 CAUTION Use NiMh rechargeable batteries IEC LR6 all of t...

Page 7: ... 9 C2 E for connection of auxiliary earth probe 10 HELP key 11 12 and keys for function selection and parameter settings 13 LCD display with backlit 14 Key for adjust contrast of display 15 MEM key for access to internal memory see 8 16 ESC key to return at previous screen 17 arrow keys and TEST key to activation measurements 4 1 1 Modify of supply voltage for HT2055S unit 1 Open the fuses compart...

Page 8: ...ts 4 Backlight key 5 LCD display 6 ON OFF key to switch the instrument ON or OFF 7 8 and keys for function selection and parameter settings 4 2 2 Top view Fig 3 HT2055M unit top view description CAPTION 1 Test connector CAUTION maximal allowed voltage between test terminals and ground is 50V Maximal allowed voltage between test terminals is 100V 2 Power supply socket 3 PS 2 connector for RS232 com...

Page 9: ... view description CAPTION 1 Battery compartment cover 2 Safety information label 3 Fixing screws for battery compartment cover Fig 5 HT2055M battery compartment description CAPTION 4 Serial number label 5 Battery cells 6x1 2V NiMH type AA 6 Battery compartment ...

Page 10: ...aved results see 8 2 and clear memory see 8 3 Setting of system time date 5 1 1 Language selection Fig 7 Screen of language selection 1 Press or keys to enter Settings menu 2 Select the item Select Language with the or keys and press TEST key 3 Select the desired language with the or keys and confirm with TEST key 4 Press ESC key to exit and go back to the previous screen 5 1 2 Help screen Fig 8 H...

Page 11: ...on of Step voltage or Contact voltage EARTH RESULT Stored earth resistance or ground resistivity results in the station will be uploaded to the meter 5 Press ESC key to exit and go back to the previous screen CAUTION The main purpose of the Time Current synchronization is to enable a correction of the step and contact voltage results after the test During the test the step and contact voltage resu...

Page 12: ...following Language English Contact and Step voltage IGEN 10A IFLT 1kA RINP 1MΩ ULIM 50V 5 1 5 Time Date settings Fig 11 Time Date settings screen 1 Press or keys to enter Settings menu 2 Select the item Set Date Time with the or keys and press TEST key 3 Use the and keys to set the date time and confirm with TEST 4 Press ESC key to exit and go back to the previous screen 5 2 MESSAGES AT DISPLAY Th...

Page 13: ...ent Recall at display of saved results see 8 2 and clear memory see 8 3 Time date setting see 5 1 5 6 1 1 Default settings This section permits to restore the default value factory of measurement parameters and limits set on the instrument Fig 13 Initial settings screen 1 Press or keys to enter Settings menu 2 Select the item Initial Settings with the or keys and press TEST key 3 Select the NO or ...

Page 14: ...xternal earth currents In this case it is recommended to decrease the output power down to 75 or 50 and restart the generator The current stopped flowing abruptly If stop was caused by disconnection of the leads it is not necessary to lower down the power The generator can be restarted 6 1 3 Setting alarm condition This section permits to set an acoustic alarm condition when stopping current gener...

Page 15: ...onnect the test leads and check why an external voltage was detected During current generation output was overloaded or test current abruptly fell down Overload can be caused by high spurious earth current In this case it is recommended to decrease the output power see 6 1 2 Output current is too low 0 2A A too low current can be caused because of bad connection or high probe resistance Date time ...

Page 16: ...nts flowing through the earth electrode grid in the ground Fault currents close to power distribution objects substations distribution towers plants can be very high up to 200 kA This can result in dangerous step and contact voltages If there are underground metal connections intended or unknown the voltage funnel can get atypical forms and high voltages can occur far from the point of failure The...

Page 17: ...of the highest fault current the measured voltages must be up scaled according to the following equation Gen Fault Measured C S I I U U US C calculated step or contact voltage in case of fault current UMeasured measured voltage during the test IFault maximal earth current in case of a fault IGen injected test current Installation of station unit 1 Place the station unit close to the earth system u...

Page 18: ... step voltage measurement Fig 18 Circuit scheme for contact voltage measurement Generation of test current 3 Switch on the station unit HT2055S 4 Use or keys and select the CURRENT GEN screen see Fig 19 Fig 19 Test current generation screen ...

Page 19: ... synchronization sets the same date and time in both units Therefore the measured voltages can be correctly scaled after the measurements If the current is generated during the synchronization its value is also sent to the meter unit see 5 1 3 6 Connect both meter and station units through the PS 2 RS 232 cable supplied as accessory see Fig 20 Fig 20 RS 232 connection between units 7 Select the op...

Page 20: ...provider Rinp Input resistance fixed to 1k for step contact voltage measurements Ulim Voltage limit given by Guidelines according to the time of fault elimination by the protection devices 10 Place and connect the test metal plates to each other where the operator stands close to the points where step voltage measurement see Fig 17 or contact voltage see Fig 18 is required respecting the necessary...

Page 21: ...value of step and contact voltages 14 Connect both meter and station units through the PS 2 RS 232 cable supplied see Fig 20 15 Select the option Synchronize Time Current on the meter unit see 5 1 3 and confirm with TEST key The messages Connecting and Synchronizing are displayed 16 The following screens can be displayed by the meter unit during the synchronization Fig 23 Example of screens on the...

Page 22: ... compensation Use also more probes connected in parallel to each other if it s necessary to reduce the contact resistance on that point 4 Fit the auxiliary metal probe 60m length on the ground at a distance of at least 2 5 times the maximum diagonal of the earth system under test see Fig 24 Connect the input terminal S to the probe by using the 50m long cable supplied if enough or use another cust...

Page 23: ...ltage probe Rp stopping the test if these values are assumed to be too high and giving the following messages Rc 2 0k and Rp 2 0k Decrease the value of these resistance wetting the ground close to the probes and or connect more probes in parallel High noise currents and voltages on earth could affect the measurement results In this case the tester displays the NOISE warning 7 Press MEM key to save...

Page 24: ...n the station unit 2 Use the or keys to select the EARTH measurement The below screen is displayed Fig 28 Main screen of ground resistance measurement 3 Use the or keys to select the a parameter Use the or keys to set the value expressed in meters into the range 0 1 30 0 by steps of 0 1m 4 Fit the auxiliary test probes at the same distance a set on the station unit and connect the input terminals ...

Page 25: ... probes and or connect more probes in parallel High noise currents and voltages in earth could affect the measurement results In this case the tester displays the NOISE warning 6 Press MEM key to save the result inside memory see 8 1 CAUTION To view stored ground resistivity results on PC they must be downloaded to the meter unit first To download the results select earth results in Synchronize me...

Page 26: ... OBJECTS and LOCATIONS The structure of measurements defines the information on the type and the number of measurements associated to the selected data structure Object and Location Fig 30 Structure of internal memory of the meters This kind of structure permits an easy manipulation of saved data as The results are organized and structured into groups The surfing among the saved results is simplif...

Page 27: ... percentage value of memory still available for saving operation 3 Use the or keys to select the type of location Object Loc1 Loc2 and the or to decrease or increase the numerical marker associated to the location range 1 199 4 Press again MEM key to complete the saving of data or the ESC key to exit without saving 8 2 RECALL RESULT AT DISPLAY The recall of result at display can be performed in th...

Page 28: ... Deletion of single measurement 2 Use the or keys to select the type of location Object Loc1 Loc2 and the or to decrease or increase the numerical marker associated to the location range 1 199 3 Press MEM key The message CLEAR RESULTS is displayed 4 Press TEST key to confirm the operation or ESC to exit the function Deletion of generated currents If the meter and station units are synchronized see...

Page 29: ...64 bit platforms 9 1 INSTALLATION OF SOFTWARE AND INITIAL CONFIGURATIONS WIN XP 1 Close all open applications on the PC 2 Insert the supplied CD ROM in the PC reader 3 Launch the TeraView exe file included on CD ROM and follow the steps to correctly install the TeraView software 4 Switch on the instrument and connect it to the PC by using the supplied USB cable or the PS 2 RS 232 serial cable conn...

Page 30: ...usly installed The TeraView program can detect automatically serial ports from COM1 to COM22 Follow the following steps to modify the COM associated to USB driver Right click of mouse on the My computer icon on the PC desktop and selection of Properties item Hardware folder Device Manager Ports COM LPT Move on the USB CDC Serial Port Emulation COMxx item right click Properties Select Port Settings...

Page 31: ...ect any measurement accessories or mains supply cable connected to the instrument before opening the battery cover to avoid electric shock 1 Remove the three screws see Fig 4 Part 3 and open the battery cover 2 Replace all the batteries with others of the same type respecting the indicated polarity 3 Restore the battery cover 4 Use the appropriate battery disposal methods for your area 10 2 REPLAC...

Page 32: ...rdg 5dgt 2 00 19 99 0 01 20 0 99 9 0 1 100 0 199 9 5 0 rdg Open voltage 50V AC Test current 7 5A Frequency of test signal 55Hz Influence of probe resistance 10 rdg 10dgt Rc Rp max 10 100R or 2k considering lower value Automatic test of probe resistance Yes Automatic detection of voltage noise Generated current range Resolution Accuracy 0 00 9 99A 0 01A 3 0 rdg 5dgt 10 0 99 9A 0 1A 3 0 rdg 3dgt Gen...

Page 33: ...rrent saved for min 24h Communication interface RS 232 with meter unit HT2055M Dimensions L x W x H 563 x 257 x 275mm 22 x 10 x 11 in Weight without accessories 29 5kg 60lv Meter unit HT2055M Internal power supply 6x1 2V rechargeable batteries NiMH type AA LR03 6x1 5V alkaline batteries type AA LR03 Battery life rechargeable 12 hours typical External power supply 100 240V AC 50 60Hz 12V DC Safety ...

Page 34: ...th Metal voltage probe 60cm length Metal plate 200x100mm 2 pcs Test cable black 50m 10mm2 with alligator clip with industrial plug on wheel Test cable black 10m 10mm2 with alligator clip with industrial plug Test cable red 50m on wheel Test cable green 10m with alligator clip on wheel Test cable red 1m with alligator clip Test cable black 1 5m Test cable black with plug for HT2055M 2x3m Alligator ...

Page 35: ...sequence of improper packaging Repairs which may become necessary as a consequence of interventions performed by unauthorized personnel Modifications to the instrument performed without the manufacturer s explicit authorization Use not provided for in the instrument s specifications or in the instruction manual The content of this manual cannot be reproduced in any form without the manufacturer s ...

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