METREL MI 3290 Instruction Manual Download Page 58

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MI 3290 Earth Analyser

Single Tests

Single tests

Single measurements and tests can be selected in the main Single tests menu or in Memory
organizer’s main and sub-menus.

10.1 Selection modes

In Single tests main menu four modes for selecting single tests are available.

Options

All

A single test can be selected from a list of all single tests.
The single tests are always displayed in the same
(default) order.

Last used

Last 9 made different single tests are displayed.

Groups

The single tests are divided into groups of similar tests.

Cross selector

Summary of Contents for MI 3290

Page 1: ...Earth Analyser MI 3290 Instruction manual Version 1 3 4 Code No 20 752 597...

Page 2: ...on your equipment certifies that it meets requirements of all subjected EU regulations 2018 METREL The trade names Metrel Smartec Eurotest Auto Sequence are trademarks registered in Europe and other c...

Page 3: ...rth Analyser its key features functionalities and use It is intended for technically qualified personnel responsible for the product and its use Please note that LCD screenshots in this document may d...

Page 4: ...stures 20 6 3 Virtual keyboard 21 6 4 Display and sound 22 6 4 1 Battery and time indication 22 6 4 2 Messages 22 6 4 3 Sound indication 24 6 4 4 Terminal voltage monitor 24 6 4 5 Help screens 25 7 Ma...

Page 5: ...l Test screens 64 10 1 7 Single test Visual Test start screen 64 10 1 8 Single test Visual Test screen during test 65 10 1 9 Single test Visual Test result screen 66 10 1 10 Single test Visual Test me...

Page 6: ...ep by step executions of Auto Sequence 121 12 2 3 Auto Sequence result screen 122 12 2 4 Auto sequence memory screen 124 13 Communication 125 14 Maintenance 126 14 1 Cleaning 126 14 2 Periodic calibra...

Page 7: ...ent through clamps 141 15 11 Influence of noise 142 15 11 1 Digital filtering technique 143 15 12 Sub results in measurement functions 143 15 13 General data 144 Appendix A Structure objects 145 Appen...

Page 8: ...lay with touch screen offers easy to read results and all associated parameters The operation is straightforward and clear to enable the user to operate the instrument without the need for special tra...

Page 9: ...quipment or any of the accessories if any damage is noticed Consider all generally known precautions in order to avoid risk of electric shock while dealing with hazardous voltages Do not connect the t...

Page 10: ...ation that a circuit is safe to touch A voltage measurement is necessary to know if a circuit is hazardous Warnings related to Batteries Use only batteries provided by the manufacturer Never dispose o...

Page 11: ...wer supply is connected to the instrument The power supply socket is shown in Figure 2 2 Internal circuit controls CC CV charging and assures maximum battery lifetime Nominal operating time is declare...

Page 12: ...t ICH 8 1 8 of the charging current 2 2 1 Precharge On power up if the battery voltage is below the VLOWV threshold the charger applies 1 8 of the charging current to the battery The precharge feature...

Page 13: ...ld typ 0 C TWARM Warm temperature threshold typ 60 C THTF Hot temperature threshold typ 75 C The charger continuously monitors battery temperature To initiate a charge cycle the battery temperature mu...

Page 14: ...fore storage Charge the instrument battery pack to approximately 50 of capacity at least once every 6 months Transportation Always check all applicable local national and international regulations bef...

Page 15: ...o 1000 V a c and 1500 V d c Equipment for testing measuring or monitoring of protective measures Part 5 Resistance to earth IEEE 80 2000 IEEE Guide for Safety in AC Substation Grounding IEEE 81 2012 I...

Page 16: ...ex clamp current If_sum If1 If2 If3 If4 Uh V Uh voltage H terminal Us V Us voltage S terminal Ues V Ues voltage ES terminal Ig_w A Overhead ground wire current Ig_w Igen If_sum R Complex number real n...

Page 17: ...4 1 below Figure 4 1 The operator s panel 1 Colour TFT display with touch screen 2 GUARD Guard input terminal 3 H C1 Output terminal for the auxiliary earth electrode 4 S P1 Output terminal for a pro...

Page 18: ...ndard USB connector type B 14 Input power supply socket type C7 Warnings Do not connect test terminals H S ES E to an external voltage higher than 300 V DC or AC CAT IV environment to prevent any dama...

Page 19: ...z Selective and Passive Flex Clamps 1 4 Wenner and Schlumberger method Impulse Measurement Meter 200 mA and 7 mA Impedance Meter Potential and S T Current Source Pylon Ground Wire Test Iron Clamp Mete...

Page 20: ...or 10 s or more The instrument automatically turns off 10 minutes after the last key was pressed Tab key is used to expand column in control panel Run key is used to start and stop the measurements 6...

Page 21: ...alphabetic characters keyboard layout selected Backspace Clears last character or all characters if selected If held for 2 s all characters are selected Enter confirms new text Activates numeric symbo...

Page 22: ...d battery inserted Time indication hh mm 6 4 2 Messages In the message field warnings and messages are displayed Conditions on the input terminals allow starting the measurement consider other display...

Page 23: ...started Limit 50 Vrms H E S E ES E H Guard S Guard ES Guard The measuring range of the instrument is exceeded Measurement will not be started or displayed High electrical noise was detected during me...

Page 24: ...pared against the limit Result is validated only if it is within the given limit Limit indication is shown in the test parameter window Message window Measurement result is inside pre set limits PASS...

Page 25: ...ions The Help menu contains schematic diagrams for illustrating proper connection of the instrument to the test object After selecting the measurement you want to perform press the HELP key in order t...

Page 26: ...ith single tests see chapter 11 Tests and Measurements for more information Auto Sequences Menu with customized test sequences see chapter 12 Auto Sequences for more information Memory Organizer Menu...

Page 27: ...ion Workspace Manager Manipulation with project files Refer to chapter 8 9 Workspace manager for more information Auto Sequence groups Manipulation with lists of Auto Sequences Refer to chapter 8 8 Au...

Page 28: ...options for decreasing power consumption can be set Figure 8 3 Power save menu Brightness Setting level of LCD brightness level LCD off time Setting LCD off after set time interval LCD is switched on...

Page 29: ...easuring settings regarding to the scope of work or country it is used These specific settings are stored in instrument profiles By default each instrument has at least one profile activated Proper li...

Page 30: ...5 Settings In this menu different general parameters can be set Figure 8 6 Settings menu Available selection Description Keys touch sound ON OFF Enables disables sound when using keys and touch scree...

Page 31: ...ed settings will be lost when setting the instruments to initial settings Measurement limits and parameters Parameters and settings in General settings menu Applying the initial settings will re boot...

Page 32: ...isplayed Only one list can be opened in the instrument at the same time The list selected in the Auto Sequence groups menu will be opened in the Auto Sequence main menu Figure 8 9 Auto Sequence groups...

Page 33: ...a list Selected list of Auto Sequences is marked with a blue dot Note Previously selected list of Auto Sequences is closed automatically 8 8 4 Deleting a list of Auto Sequences Procedure A list of Aut...

Page 34: ...ports are stored on directory EXPORTS Export files can be read by Metrel applications that run on other devices Exports are suitable for making backups of important works To work on the instrument an...

Page 35: ...g a Workspace for more information Deletes the selected Workspace Refer to chapter 8 9 7 Deleting a Workspace Export for more information Adds a new Workspace Refer to chapter 8 9 5 Adding a new Works...

Page 36: ...ocedure New Workspaces can be added from the Workspace Manager screen Enters option for adding a new Workspace Keypad for entering name of a new Workspace is displayed after selecting New After confir...

Page 37: ...pened Workspace is marked with a blue dot The previously opened Workspace will close automatically 8 9 7 Deleting a Workspace Export Procedure Workspace Export to be deleted should be selected from th...

Page 38: ...ist Enters option Import Before the import of the selected file the user is asked for confirmation The Imported Export file is added to the list of Workspaces Note If a Workspace with the same name al...

Page 39: ...exporting the selected Workspace the user is asked for confirmation Workspace is exported to Export file and is added to the list of Exports Note If an Export file with the same name already exists t...

Page 40: ...ended to change factory set administrator password after first use If the custom password is forgotten the second administrator password can be used This password always unlocks the Account manager an...

Page 41: ...file menu The account manager password must be entered and confirmed first Administrator password consists of letters and or numbers Letters are case sensitive The default password is ADMIN 8 10 2 Cha...

Page 42: ...nu is accessed by selecting Account manager in Sign in menu or User profile menu The account manager password must be entered and confirmed first The default password is ADMIN Field for setting if sig...

Page 43: ...should be entered and confirmed Enters menu for editing user accounts Figure 8 16 Edit accounts menu Options Opens the window for adding a new user In the Add New window the name and initial password...

Page 44: ...A Structure objects Figure 9 1 Default tree structure and its hierarchy 9 1 1 Measurement statuses Each measurement has a status Pass or Fail or no status a name results limits and parameters A measur...

Page 45: ...project in tree menu 9 1 3 Measurement status indication under the Structure item Overall status of measurements under each structure item sub item can be seen without spreading tree menu This feature...

Page 46: ...t memory screen Starts a new measurement The instrument goes to the measurement start screen Clones the measurement The selected measurement can be copied as an empty measurement under the same Struct...

Page 47: ...surement The instrument goes to the menu for adding measurement into structure Refer to chapter 9 1 4 5 Add a new measurement for more information Adds a new Structure item A new Structure item can be...

Page 48: ...ss tab key followed by enter key to enter menu for editing parameters Procedure Select structure item to be edited Select Parameters in Control panel Example of Parameters menu In menu for editing par...

Page 49: ...ructure item This menu is intended to add new structure item in the tree menu A new structure item can be selected and then added in the tree menu Procedure Default initial structure Select Add Struct...

Page 50: ...Control panel Add new measurement menu a Type of test can be selected from this field Options Single Tests Auto Sequence Tap on field or press the enter key to modify b Last added measurement is offer...

Page 51: ...ginal Procedure Select the structure item to be cloned Select Clone in Control panel The Clone Structure menu is displayed Sub elements of the selected structure item can be marked or un marked for cl...

Page 52: ...Procedure Select the measurement to be cloned Select Clone in Control panel A new empty measurement is displayed 9 1 4 8 Copy Paste a Structure item In this menu selected Structure item can be copied...

Page 53: ...w structure item is displayed Note The Paste command can be executed one or more times 9 1 4 9 Cloning and Pasting sub elements of selected structure item When structure item is selected to be cloned...

Page 54: ...copied Select Copy in Control panel Select the location where measurement should be pasted Select Paste in Control panel A new empty measurement is displayed in selected Structure item Note The Paste...

Page 55: ...ns to the tree menu without changes Structure without deleted structure item 9 1 4 12 Delete a measurement In this menu selected measurement can be deleted Procedure Select a measurement to be deleted...

Page 56: ...dure Select the structure item to be renamed Select Rename in Control panel Virtual keypad will appear on screen Enter new text and confirm Refer to chapter 6 3 Virtual keyboard for keypad operation S...

Page 57: ...starting screen is displayed a Parameters and limits can be viewed and edited Select Run in Control panel to retest the measurement Results sub results after re run of recalled measurement Select Sav...

Page 58: ...10 1 Selection modes In Single tests main menu four modes for selecting single tests are available Options All A single test can be selected from a list of all single tests The single tests are always...

Page 59: ...ys 10 1 1 Single test screens In the Single test screens measuring results sub results limits and parameters of the measurement are displayed In addition on line statuses warnings and other info are d...

Page 60: ...arameters and limits of single tests Procedure Select the test or measurement The test can be entered from Single tests menu or Memory organizer menu once the empty measurement was created under selec...

Page 61: ...le test main menu saving under the last selected Structure object will be offered by default The user can select another Structure object or create a new Structure object By pressing the key in Memory...

Page 62: ...ng on Enters cross selector to select test or measurement 10 1 4 Graph view Figure 10 3 Graph result screen Example of 4 pole sweep measurement Options Plot edit Opens control panel for editing graphs...

Page 63: ...ts Options Retest Enters starting screen for a new measurement Opens menu for changing parameters and limits of selected measurements Refer to chapter 10 1 2 Setting parameters and limits of single te...

Page 64: ...ine statuses and other information are displayed Item Child item Status fields Options Selected Visual Test Overall status Figure 10 5 Visual Test screen organisation 10 1 7 Single test Visual Test st...

Page 65: ...een during test Options during test Selects item Applies a pass to the selected item or group of items Applies a fail to the selected item or group of items Clears status in selected item or group of...

Page 66: ...ngle test main menu Saving under the last selected Structure object will be offered by default The user can select another Structure object or create a new Structure object By pressing the key in Memo...

Page 67: ...ser Single Tests 67 10 1 10 Single test Visual Test memory screen Figure 10 9 Visual Test memory screen Options Retest Enters starting screen and starts the new Visual test Set cursor for viewing data...

Page 68: ...prior Pass Fail Clear Checked 3 Remote probes and test leads are under continuous observation Pass Fail Clear Checked Table 11 2 Visual Test Safety Precautions Before Test Safety Hazards During Test...

Page 69: ...mitigated by the physical orientation of test leads grounding or both Pass Fail Clear Checked 2 Surge arrester ground continuity tests precautions The base of the surge arrester can approach line pote...

Page 70: ...e is selected by the operator depending on the particular earthing system to be tested Earth Measurement Test Mode Graph LF HF Filter Test Voltage Impedance Resistance Ze Re 2 pole single sweep Ze f 5...

Page 71: ...ugh an auxiliary probe H The impedance of the auxiliary probe H should be as low as possible The impedance Rc can be decreased by using more probes in parallel or using an auxiliary earthing system as...

Page 72: ...t the 2 pole measurement function Set the test parameters mode voltage frequency distance and limit Connect the test leads to the instrument and to the test object Press the Run key to start the measu...

Page 73: ...ance of the auxiliary probe H should be as low as possible in order to inject a high test current The impedance Rc can be decreased by using more probes in parallel A higher injected current improves...

Page 74: ...surement function Set the test parameters mode voltage frequency distance and limit Connect the test leads to the instrument and to the test object Press the Run key to start the measurement Wait unti...

Page 75: ...order to inject a high test current The impedance Rc can be decreased by using more probes in parallel A higher injected current improves the immunity against spurious earth currents The differential...

Page 76: ...surement function Set the test parameters mode voltage frequency distance and limit Connect the test leads to the instrument and to the test object Press the Run key to start the measurement Wait unti...

Page 77: ...sing more probes in parallel A higher injected current improves the immunity against spurious earth currents The voltage drop is measured by auxiliary potential probe S and ES terminal The selective c...

Page 78: ...ction Set the test parameters mode clamp type frequency distance and limit Connect the test leads and clamp to the instrument and to the test object Press the Run key to start the measurement Wait unt...

Page 79: ...cts a voltage in the earthing system The injected voltage generates a test current in the loop If the total loop earth impedance of the electrodes Ze1 Ze2 Ze3 and Ze4 connected in parallel is much low...

Page 80: ...generator clamp type A1019 Limit Ze Limit value selection OFF 0 1 40 2 Clamps Measurement procedure Select the 2 Clamps measurement function Set the test parameters clamp type frequency and limit Con...

Page 81: ...3290 Earth Analyser Guard Rp G V A S probe H auxiliary earth rod Rc 25 kHz shielded cable tower nex tower overhead grounding wire Igw Re Igw LGW nex tower Ie R GW LGW Ih Figure 11 27 HF Earth Resista...

Page 82: ...t the following parameters SER PAR Model Distance and Limit Re can be edited Figure 11 29 HF Earth Resistance 25 kHz measurement menu Test parameters for HF Earth Resistance 25 kHz SER PAR Model Set d...

Page 83: ...m the measured object Note to SER PAR Model parameter Example Series Activates the series equivalent circuit model Re value is derivate based on the series model Test objects description and schematic...

Page 84: ...possible in order to inject a high test current The impedance Rc can be decreased by using more probes in parallel A higher injected current improves the immunity against spurious earth currents The...

Page 85: ...f turns F3 Set the number of turns for Flex 3 input terminal 1 2 3 4 5 6 Number of turns F4 Set the number of turns for Flex 4 input terminal 1 2 3 4 5 6 Distance r Distance between E and S probe user...

Page 86: ...window 11 2 8 Passive Flex Clamps Measurement The passive measuring method is using the Inductive current or grounding wire current Igw flowing in the earthing system to determine the selected earth...

Page 87: ...istance and Limit Ztot can be edited Figure 11 38 Passive Flex Clamps measurement menu Test parameters for Passive Flex Clamps Number of turns F1 Set the number of turns for Flex 1 input terminal 1 2...

Page 88: ...uld influence the measurement results The tester displays the noise warning in this case Note Probe Probes must be placed at a sufficient distance from the measured object Notes Flex When using only o...

Page 89: ...FFT 20 40 V Schlumberger Method single m ft yes FFT 20 40 V Table 11 41 Available Specific Earth Resistance measurements in the MI 3290 11 3 1 General on specific earth What is Specific Earth Resistan...

Page 90: ...m and 49 9 m Connect the cables to the probes then to terminals H S ES and E E a r t h H S ES E MI 3290 Earth Analyser a G V A S probe ES probe E probe H probe a a b Figure 11 43 Wenner method example...

Page 91: ...the Wenner method measurement function Set the test parameters voltage distance and limit Connect the test leads to the instrument and to the test object Press the Run key to start the measurement Wa...

Page 92: ...ance d must be between 0 1 m and 49 9 m and the distance a must be a 2 d Connect the cables to the probes then to terminals H S ES and E E a r t h H S ES E MI 3290 Earth Analyser a G V A S probe ES pr...

Page 93: ...Schlumberger method Measurement procedure Select the Schlumberger method measurement function Set the test parameters voltage distances and limit Connect the test leads to the instrument and to the te...

Page 94: ...0 s shielded cable Figure 11 49 Impulse Measurement example During the measurement a current impulse 10 350 s is injected into the earth through an auxiliary probe H The impedance of the auxiliary pro...

Page 95: ...ters distance and limit Connect the test leads to the instrument and to the test object Press the Run key to start the measurement Wait until the test result is displayed on the screen Save results op...

Page 96: ...The resistance measurement is performed with DC current of 200 mA Idc C1 C2 MI 3290 Earth Analyser G V A Rx 2 wire Figure 11 53 Meter 200 mA example 2 wires In the example following resistance is meas...

Page 97: ...general this function serves as standard meter with a low testing current The measurement is performed continuously without polarity reversal This function can also be applied for testing continuity o...

Page 98: ...hapter describes how to compensate test leads resistance in both continuity functions Meter 200 mA and 7 mA Compensation is required in 2 wire mode to eliminate the influence of test leads resistance...

Page 99: ...0 A graphical representation of the complex impedance plane 11 6 1 Impedance Meter Measurement C1 P1 P2 C2 MI 3290 Earth Analyser G Vac Aac Zx 4 wire Kelvin Iac R R jX jX Series Parallel Figure 11 61...

Page 100: ...t voltage 20 V or 40 V SER PAR Model Set desired model Series or Parallel Limit Z Limit value selection OFF 1 15 0 k single test mode only Impedance Meter measurement procedure Select the Impedance Me...

Page 101: ...ectrode 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 voltage...

Page 102: ...e probes in parallel A higher injected current improves the immunity against spurious earth currents The voltage drop is measured by auxiliary potential probe S where US Potential voltage normalized t...

Page 103: ...uency Set test frequency 55 Hz 82 Hz 94 Hz 105 Hz 111 Hz 128 Hz 164 Hz 329 Hz Latitude Enter the latitude point user defined DD Decimal degrees Longitude Enter the longitude point user defined DD Deci...

Page 104: ...easurement and goes to the result screen Figure 11 74 Example of Potential measurement result screen Figure 11 75 Example of Potential measurement graph view Potential measurement X Y and GPS procedur...

Page 105: ...h noise currents and voltages in earth could influence the measurement results The tester displays the noise warning in this case Graph view is not available during the measurement Notes Probes High i...

Page 106: ...dy resistance E a r t h Igen H E MI 3290 Earth Analyser G V A H auxiliary earth rod 5a a 1m 1k Metal plates MI 3295M Figure 11 78 Step Voltage example Touch Voltage The measurement is performed betwee...

Page 107: ...red voltages must be up scaled according to following equation MI 3295M MI 3290 where Us t Calculated Step or Touch Voltage in case of an fault current Um Test voltage drop MI 3295M V meter Ifault Set...

Page 108: ...e Wire Test PGWT example During the measurement a sinusoidal current Igen is injected into the earth through an auxiliary probe H The resistance of the auxiliary probe H should be as low as possible i...

Page 109: ...Test function Set the test parameters mode frequency number of turns 1 4 Connect the test leads and flex clamps to the instrument and to the test object Press the Run key to start the measurement Wait...

Page 110: ...Available Current RMS measurements in the MI 3290 Iron Clamp Meter RMS This function is intended for measurement of AC currents leakage currents loads currents noise currents using iron current clamp...

Page 111: ...lamp type Set clamp type A1018 Limit Ic Limit value selection OFF 10 mA 9 00 A Iron Clamp Meter RMS measurement procedure Select the Iron Clamp Meter RMS measurement function Set the test parameter cl...

Page 112: ...t terminal 1 2 3 4 5 6 Flex Clamp Meter RMS Measurement procedure Select the Flex Clamp Meter RMS measurement function Set the test parameters number of turns 1 4 Connect the flex clamps to the instru...

Page 113: ...be E a r t h H S ES E V V Figure 11 95 Voltage Meter RMS example 11 10 1 Voltage Meter RMS Measurement Test can be started from the Voltage Meter RMS measurement window Figure 11 96 Example of Voltage...

Page 114: ...ailable Checkbox measurements in the MI 3290 Note The Checkbox feature should be used to ensure that the meter is reading correctly between calibrations but should not be regarded as a substitute for...

Page 115: ...easurement menu Figure 11 103 Example of Check V Meter measurement result Test parameters for Check V Meter Test Voltage Set test voltage 20 V or 40 V Test Frequency Set test frequency 55 Hz 82 Hz 94...

Page 116: ...eck A Meter measurement menu Figure 11 106 Example of Check A Meter measurement result Test parameters for Check A Meter Test Voltage Set test voltage 20 V or 40 V Test Frequency Set test frequency 55...

Page 117: ...2 input terminal 1 2 3 4 5 6 Number of turns F3 Set the number of turns for Flex 3 input terminal 1 2 3 4 5 6 Number of turns F4 Set the number of turns for Flex 4 input terminal 1 2 3 4 5 6 Check Iro...

Page 118: ...e changed set 12 1 Selection of Auto Sequence The Auto Sequence list from Auto Sequence groups menu should be selected first Refer to chapter 8 8 Auto Sequence groups for more details The Auto Sequenc...

Page 119: ...ow commands After the test sequence is finished the Auto Sequence result menu is shown Details of individual tests can be viewed and the results can be saved to Memory organizer 12 2 1 Auto Sequence v...

Page 120: ...parameters and limits of selected measurements Refer to chapter 10 1 2 Setting parameters and limits of single tests for more information how to change measurement parameters and limits Indication of...

Page 121: ...low commands Figure 12 4 Auto Sequence example of a pause with message text or picture Figure 12 5 Auto Sequence example of a finished measurement with options for proceeding Options during execution...

Page 122: ...instrument goes to menu for viewing details of the Auto Sequence Saves the Auto Sequence results A new Auto Sequence was selected and started from a Structure object in the structure tree The Auto Seq...

Page 123: ...t in Auto Sequence are displayed on Opens menu for viewing parameters and limits of selected measurements Refer to chapter 10 1 2 Setting parameters and limits of single tests for more information Fig...

Page 124: ...o Sequence memory screen details of the saved Auto Sequence can be viewed and a new Auto Sequence can be restarted Figure 12 9 Auto Sequence memory screen Options Retest the Auto Sequence Enters menu...

Page 125: ...all the correct USB driver see notes The instrument is prepared to communicate with the PC over USB Bluetooth communication The internal Bluetooth module enables easy communication via Bluetooth with...

Page 126: ...is regularly calibrated in order that the technical specification listed in this manual is guaranteed We recommend an annual calibration Only an authorized technical person can do the calibration Plea...

Page 127: ...659 Hz 1 31 kHz 1 50 kHz 2 63 kHz 3 29 kHz 6 59 kHz 13 1 kHz 15 0kHz Short circuit test current 220 mA 164 Hz 40 Vac Limit range Ze 0 1 5 k OFF Test voltage shape sine wave Ze definition Impedance va...

Page 128: ...rcuit test current 220 mA 164 Hz 40 Vac Limit range Zsel 0 1 5 k OFF Test voltage shape sine wave Zsel definition Impedance value Z f Measuring time see Table 15 2 Measurement Clamp type A1018 Automat...

Page 129: ...c test of voltage noise yes Low clamp current indication yes Ic Typical loop test current Loop Impedances Test frequency 10 m 100 m 500 m 1 5 10 164 Hz 6 8 A 0 36 A 80 mA 40 mA 8 mA 4 mA Table 15 1 Ty...

Page 130: ...z Short circuit test current 40 mA Limit range Re 1 100 OFF Test voltage shape sine wave Re definition Impedance excluding the reactance value Measuring time typical 10 s Automatic test of probe resis...

Page 131: ...z 40 Vac Limit range Ztot 0 1 5 k OFF Test voltage shape sine wave Ztot definition Impedance value Z f Measuring time see Table 15 2 Automatic test of probe resistance yes Automatic connection test ye...

Page 132: ...ed value consider uncertainty of 4 pole measurement 20 0 ft 199 9 ft 0 1 ft 200 ft 999 ft 1 ft 1 000 k ft 1 999 k ft 0 001 k ft 2 00 k ft 19 99 k ft 0 01 k ft 20 0 k ft 199 9 k ft 0 1 k ft 200 k ft 99...

Page 133: ...stance S 1 2 M Ifault range selectable 1 A 200 kA Measuring time see Table 15 2 3 pole Automatic test of probe resistance yes Automatic connection test yes H S E Automatic range selection yes Automati...

Page 134: ...voltage noise yes Guard terminal yes Influence of the auxiliary electrodes The current probe Rc and potential probe Rp are measured using 3 Pole measurement at a fix frequency 3 29 kHz 40 Vac open ter...

Page 135: ...en terminal test voltage 20 Vdc Short circuit test current min 200 mAdc into load resistance of 2 Test current direction unidirectional Max inductivity 2 H Limit range R 0 1 40 OFF Measuring time typi...

Page 136: ...continuous Open terminal test voltage 20 Vdc Short circuit test current 7 2 mAdc Test current direction unidirectional Limit range R 1 15 0 k OFF Measuring refresh rate typical 2 s Test method 2 wire...

Page 137: ...0 s at 164 Hz depending on test frequency Test method 4 wire Rc1 Rc2 5 max Rp1 Rp2 5 max Automatic connection test yes C1 P1 P2 C2 Automatic range selection yes Automatic test of voltage noise yes 15...

Page 138: ...uncertainty for one turn except for the measurement range of 10 mA 99 9 mA which must be at least 3 turns Do not measure close to other current carrying conductors if possible An external magnetic fi...

Page 139: ...esolution Uncertainty f 40 Hz 999 Hz 1 Hz 0 2 of reading 1 digit 1 00 kHz 4 50 kHz 10 Hz Test mode continuous Input resistance H E 1 2 M Input resistance S E 1 2 M Input resistance ES E 1 2 M Measurin...

Page 140: ...9 Hz 250 1 k Ra 250 500 Ra 25 k 15 of reading 1 31 kHz 2 63 kHz 100 500 Ra 50 250 Ra 12 5 k 15 of reading 3 29 kHz 6 59 kHz 100 250 Ra 50 125 Ra 6 25 k 15 of reading 13 1 kHz 15 0 kHz 50 150 Ra 50 50...

Page 141: ...ee Notes 10 of reading 3 digits If the low current limit is exceeded by an additional 70 Ic 0 3 mA and If1 4 1 5 mA then the main measuring result is disabled Standard uncertainty Additional uncertain...

Page 142: ...Hz 55 Hz 50 dB 82 Hz 25 0 kHz 80 dB 50 Hz 55 Hz 50 dB 82 Hz 25 0 kHz 80 dB 16 2 3 Hz 55 Hz 25 0 kHz 80 dB d c 55 Hz 25 0 kHz 80 dB Measurement function 2 Clamps Max noise interference current through...

Page 143: ...any other frequencies Inoise So frequencies different from the measurement frequency will not influence on the measurement result 15 12 Sub results in measurement functions Sub result Measuring range...

Page 144: ...ay with touch screen Reference conditions Reference temperature range 25 C 5 C Reference humidity range 40 RH 60 RH Operation conditions Working temperature range 10 C 50 C Maximum relative humidity 9...

Page 145: ...ation name description location type nominal power nominal voltage GPS Power Station name description location type nominal power GPS Transmission Tower name description location type material type no...

Page 146: ...ance 25 kHz Earth Selective Flex Clamps 1 4 Earth Passive Flex Clamps 1 4 Earth Wenner method Specific Schlumberger method Specific Impulse Measurement Pulse Meter 200 mA DC R Meter 7 mA DC R Impedanc...

Page 147: ...is connected to the earthing electrode rod Probe H serves to close the measuring loop The voltage between probe S and E is the voltage drop on the measured resistance Correct placing of probes is ess...

Page 148: ...ment of test probes A measurement with three placements of test probe S S S S is intended to verify that the selected distance d1 is long enough Distance from tested earthing electrode system E ES to...

Page 149: ...nd the d1 should be increased Notes Initial uncertainty of measured resistance to earth depends on distance between electrodes d1 and size of earthing electrode a It can be seen in Table C 4 d1 a Unce...

Page 150: ...nt placements of test probes The test probes shall be placed in the opposite direction from tested electrode 180 or at least 90 Test probe resistances In general test probes should have a low resistan...

Page 151: ...Oscilloscope screenshot Re1 Figure D 2 Oscilloscope screenshot Re2 Figure D 3 Oscilloscope screenshot Re3 Figure D 4 Oscilloscope screenshot Re4 3 pole measurement results 3 pole Re Calculated impedan...

Page 152: ...PC SW Auto Sequence Editor workspace is divided in four main areas On the left side structure of selected group of Auto Sequence is displayed In the middle part of the workspace the elements of the se...

Page 153: ...n a file More files can be opened simultaneously in Auto Sequence Editor Within Group of Auto Sequences tree structure can be organized with folders subfolders containing Auto Sequences The three stru...

Page 154: ...ion options also available by right clicking on Folder or Auto Sequence Adds a new folder subfolder to the group Adds a new Auto Sequence to the group Deletes the selected Auto Sequence the selected f...

Page 155: ...name of Auto Sequence Description Any text for additional description of Auto Sequence can be entered Image Image presenting Auto sequence measuring arrangement can be entered or deleted Enters menu...

Page 156: ...ingle tests are the same as in Metrel ES Manager Measurement menu Limits and parameters of the measurements can be set Results and sub results can t be set Flow commands Flow commands are used to cont...

Page 157: ...urement step flow command can be copied and pasted above selected location on the same or on another Auto Sequence Copy Paste after A measurement step flow command can be copied and pasted under selec...

Page 158: ...t measurement Parameters State On enables Buzzer mode Off disables Buzzer mode Operation after end of test This flow command controls the proceeding of the Auto Sequence in regard to the measurement r...

Page 159: ...rrent If_sum has to be measured separately with the method as described in IEEE 81 2012 Ch 8 2 2 6 and implemented in MI 3290 Earth Analyser measurements with multiple flex clamps The following relati...

Page 160: ...values the user has to decide which position he will use for the measurement the S probe has to be positioned to the selected balanced position and then the actual measurement with the flex clamps ca...

Page 161: ...ng Example The flex clamp s have to be positioned first and then the parameters have to be entered Balancing is enabled only in single Test Mode The appropriate values for number of flex turns have to...

Page 162: ...ng procedure 162 Balancing procedure ends with two results r1 and r2 Select one with or and commit with the selected result Results must be in the range of 1 1000 to be valid The selected result is au...

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