METREL MI 3205 Instruction Manual
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METREL MI 3205 Instruction Manual

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TeraOhm XA 5 kV
MI 3205
Instruction manual
Version 1.1; Code No. 20 752 446

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Summary of Contents for METREL MI 3205

  • Page 1 TeraOhm XA 5 kV MI 3205 Instruction manual Version 1.1; Code No. 20 752 446...
  • Page 2 Mark on your equipment certifies that this equipment meets the requirements of the EU (European Union) concerning safety and electromagnetic compatibility regulations © 2015 METREL No part of this publication may be reproduced or utilized in any form or by any means without permission in writing from METREL.

  • Page 3: Table Of Contents

    MI 3205 TeraOhm XA 5kV Table of contents Table of contents General Description .................... 5 Features ......................5 Safety and operational considerations ............. 6 Warnings and notes ..................6 Battery and charging of Li-ion battery pack ........... 8 2.2.1 Precharge ....................9 2.2.2...
  • Page 4 MI 3205 TeraOhm XA 5kV Table of contents 5.1.3 Typical insulation tests ................. 30 5.1.4 Electrical representation of insulating material ........31 Some application examples ................ 32 5.2.1 Basic Insulation resistance test ............32 5.2.2 Voltage dependence test – Step Voltage Test ........32 5.2.3...

  • Page 5: General Description

    1 General Description 1.1 Features TeraOhm XA 5kV (MI 3205) is a portable battery (Li-ion) or mains powered test instrument with excellent IP protection: IP65 (case closed), IP54 (case open), intended for diagnosing of Insulation Resistance by using high test voltages of up to 5 kV. It is designed and produced with the extensive knowledge and experience acquired through many years of working in this field.

  • Page 6: Safety And Operational Considerations

    2.1 Warnings and notes In order to maintain the highest level of operator safety while carrying out various tests and measurements Metrel recommends keeping your TeraOhm XA 5kV instruments in good condition and undamaged. When using the instrument, consider the following general warnings: symbol on the instrument means »Read the Instruction manual with...
  • Page 7 MI 3205 TeraOhm XA 5kV Safety and operational considerations Warnings related to measurement functions: Working with the instrument Use only standard or optional test accessories supplied by your distributor!  Equipment under test must be switched off (i.e. de-energized) before test leads ...

  • Page 8: Battery And Charging Of Li-Ion Battery Pack

    MI 3205 TeraOhm XA 5kV Safety and operational considerations 2.2 Battery and charging of Li-ion battery pack The instrument is designed to be powered by rechargeable Li-ion battery pack or with mains supply. The LCD contains an indication of battery condition and the power source (upper left section of LCD).

  • Page 9: Precharge

    MI 3205 TeraOhm XA 5kV Safety and operational considerations Typical charging profile which is also used in this instrument is shown in Figure 2.4. Figure 2.4: Typical charging profile where: ....... Battery charging voltage ......Precharge threshold voltage LOWV ........Battery charging current .........
  • Page 10 MI 3205 TeraOhm XA 5kV Safety and operational considerations Typical charging time is 4 hours in the temperature range of 5°C to 60°C. Figure 2.6: Typical charging current vs temperature profile where: ......... Cold temperature threshold (typ. -15°C) ......Cool temperature threshold (typ. 0°C) COOL ......

  • Page 11: Li - Ion Battery Pack Guidelines

    MI 3205 TeraOhm XA 5kV Safety and operational considerations 2.2.2 Li – ion battery pack guidelines Li – ion rechargeable battery pack require routine maintenance and care in their use and handling. Read and follow the guidelines in this user manual to safely use Li – ion battery pack and achieve the maximum battery life cycles.

  • Page 12: Standards Applied

    MI 3205 TeraOhm XA 5kV Instrument description 2.3 Standards applied The TeraOhm XA 5kV instrument is manufactured and tested in accordance with the following regulations: Electromagnetic compatibility (EMC) EN 61326 Electrical equipment for measurement, control and laboratory use – EMC requirements Class A...

  • Page 13: Instrument Description

    MI 3205 TeraOhm XA 5kV Instrument description 3 Instrument description 3.1 Instrument casing The instrument is housed in a plastic box that maintains the protection class defined in the general specifications. 3.2 Operator’s panel The operator’s panel is shown in Figure 3.1 below.
  • Page 14 MI 3205 TeraOhm XA 5kV Instrument description Turn the display backlight ON or OFF. ☼ Instrument’s RESET (hold key for 5 s or more). Display Section: High voltage warning light (red). Terminal Section: + Rx Positive high voltage output terminal.

  • Page 15: Accessories

    (red, black) banana connectors is 3 m; optional lengths are 8 m and 15 m. For more details see attached list for standard configuration and options or contact your distributor or see the METREL home page: http://www.metrel.si.

  • Page 16: Display Organization

    MI 3205 TeraOhm XA 5kV Instrument description 3.4 Display organization Figure 3.4: Typical function display and graph screen 1 Measurement result window 2 Measurement control window 3 Messages window 4 Battery, time and communication indication 5 Measurement result line 6 Graphical presentation of measured data 3.4.1 Measurement result window...

  • Page 17: Measurement Control Window

    MI 3205 TeraOhm XA 5kV Instrument description Shows the capacitance measured at the output terminals. Value of capacitance is measured during the final discharge of the test object. R1, R2, R3 Show resistances measured at Timer1, Timer2 and Timer3. When the measurement is completed result is hold on screen, until new measurement is started (appears only in Diagnostic Test).

  • Page 18: Message Window

    MI 3205 TeraOhm XA 5kV Instrument description Timer2 Delay for starting PI measurement (mm:ss) – step 1 s (max time 99 min). Timer3 Allows user to set the desired measurement duration (mm:ss) – step 1 s (max time 99 min).

  • Page 19: Battery, Time And Communication Indication

    MI 3205 TeraOhm XA 5kV Instrument description High voltage is present on measuring terminals (> 50 V rms). Test result can be saved. AC noise is present on the measuring terminals (+ Rx, - Rx). A Breakdown or Over voltage event has accrued.

  • Page 20: Measurement Result Line

    MI 3205 TeraOhm XA 5kV Instrument description 3.4.5 Measurement result line Shows Insulation resistance. During measurement campaign this result is refreshed every few seconds. When the measurement is completed it represents Insulation resistance at cursor position. Shows the output voltage. During measurement campaign this result is refreshed every few seconds.

  • Page 21: Main Menu

    MI 3205 TeraOhm XA 5kV Main menu 4 Main menu 4.1 Instrument Main menu From the Main menu of the instrument there are five options available: Measurements, Custom tests, Memory menu, Settings menu and Help menu. Figure 4.1: Instrument Main menu...

  • Page 22: Custom Tests

    MI 3205 TeraOhm XA 5kV Main menu 4.2 Custom tests This menu contains a list of custom prepared tests. The commonly used tests are added to the list by default or user. Up to 30 custom tests can be pre-programmed.

  • Page 23: Memory Menu

    MI 3205 TeraOhm XA 5kV Main menu 4.3 Memory menu Measurement result with all relevant parameters can be stored into the instrument’s memory. The instrument’s memory space is divided into 3 levels: OBJECT, DUT and LINE. The OBJECT, DUT and LINE level can contain up to 199 locations.

  • Page 24: Recalling Results

    MI 3205 TeraOhm XA 5kV Main menu 4.3.2 Recalling results To enter Recall results menu in Memory menu SELECT key should be pressed. Figure 4.6: Recall Results menu Figure 4.7: Recalled result screen Keys in Recall menu:   Selects one of the following items OBJECT / DUT / LINE.

  • Page 25: Deleting Results

    MI 3205 TeraOhm XA 5kV Main menu 4.3.3 Deleting results To enter Delete results menu in Memory menu SELECT key should be pressed. Single measurement or all measurements under selected OBJECT, DUT and LINE can be deleted. Figure 4.8: Delete all measurements under selected Object Keys in Delete results menu: ...

  • Page 26: Clearing Complete Memory Content

    MI 3205 TeraOhm XA 5kV Main menu 4.3.5 Clearing complete memory content When selecting the Clear all memory function in Memory menu all the memory content will be deleted. Keys in Clear all memory confirmation screen:   Toggles between YES or NO.

  • Page 27: Language Selection

    MI 3205 TeraOhm XA 5kV Main menu 4.4.1 Language selection The instrument language can be set. Keys:   Toggles between different languages (changes are stored automatically). Note: No confirmation is needed to set the desired language.  4.4.2 Initial Settings selection In this menu the following instrument parameters can be set to their initial values: All measurement parameters;...

  • Page 28: Transfer Mode

    MI 3205 TeraOhm XA 5kV Main menu 4.4.5 Transfer mode The instrument communication mode can be set. Keys:   Toggles between RS232, USB and Bluetooth. Note: No confirmation is needed to set the desired transfer mode.  4.4.6 Contrast selection In this selection the contrast of the display can be set.

  • Page 29: Break Down Selection

    MI 3205 TeraOhm XA 5kV Main menu 4.4.9 Break Down selection In this selection the Break down can be set. When triggered the Break down circuit automatically stops the measuring procedure. Keys:   Toggles between YES or NO (changes are stored automatically).

  • Page 30: Measurements

    MI 3205 TeraOhm XA 5kV Measurements 5 Measurements 5.1 General information about high voltage testing 5.1.1 The purpose of insulation tests Insulating materials are important parts of almost every electrical product. The material’s properties depend not only on its compound characteristics but also on temperature, pollution, moisture, ageing, electrical and mechanical stress, etc.

  • Page 31: Electrical Representation Of Insulating Material

    MI 3205 TeraOhm XA 5kV Measurements 5.1.4 Electrical representation of insulating material The Figure 5.1 represents the equivalent electrical circuit of an insulating material. Itest surface m aterial Itest R iss1 C p i R iso C iso G u ard...

  • Page 32: Some Application Examples

    MI 3205 TeraOhm XA 5kV Measurements 5.2 Some application examples 5.2.1 Basic Insulation resistance test Virtually every standard concerning the safety of electrical equipment and installations requires the performance of a basic insulation testing. When testing lower values (in the range of M), the basic insulation resistance (Riso) usually dominates.
  • Page 33 In general, insulators that are in good condition will show a “high” polarization index while insulators that are damaged will not. Note that this rule is not always valid. Refer to Metrel’s handbook Insulation Testing Techniques for more information. General applicable values:...

  • Page 34: Withstanding Voltage Test

    MI 3205 TeraOhm XA 5kV Measurements 5.2.4 Withstanding Voltage Test Some standards allow the use of a DC voltage as an alternative to AC withstanding voltage testing. For this purpose the test voltage has to be present across the insulation under test for a specific time.

  • Page 35: Guard Terminal

    MI 3205 TeraOhm XA 5kV Measurements 5.3 Guard terminal The purpose of the GUARD terminal is to lead away potential leakage currents (e.g. surface currents), which are not a result of the measured insulation material itself but are a result of the surface contamination and moisture. This current interferes with the measurement i.e.

  • Page 36: Averaging Options

    MI 3205 TeraOhm XA 5kV Measurements 5.4 Averaging options Filters and additional averaging are built in to reduce the influence of noise on measurement results. This option enables more stable results especially when dealing with high Insulation Resistances. In Insulation Measurement the status of the averaging option is shown in measurement control window of the LCD screen.

  • Page 37: Example Of Averaging

    MI 3205 TeraOhm XA 5kV Measurements 5.4.2 Example of averaging Capacitive test object 200 nF Insulation Resistance Measurement Test parameters: Un = 5.00 kV Timer1 = 5:00 min Figure 5.3: Insulation Meas. (AVG _ _ _ ) Figure 5.4: Insulation Meas. (AVG 5s ) Figure 5.5: Insulation Meas.

  • Page 38: Measurement Menu

    MI 3205 TeraOhm XA 5kV Measurements 5.5 Measurement menu In the Measurement menu 4 different measurements and tests can be selected. Figure 5.7: Measurement menu Keys:   Selects measurement or test. SELECT Enters selected measurement function window. Returns to the Main menu.

  • Page 39: Insulation Resistance Measurement

    MI 3205 TeraOhm XA 5kV Measurements 5.6 Insulation Resistance Measurement Test can be started from the Insulation Resistance Measurement window. Before carrying out a test the parameters output voltage, timer, high limit and additional averaging can be edited. Figure 5.8: Insulation Resistance Measurement menu Test parameters for Insulation resistance Measurement Set test voltage –...
  • Page 40 MI 3205 TeraOhm XA 5kV Measurements Insulation Measurement procedure: Select the Insulation Resistance Measurement function.  Set the test parameters (voltage, timer, high limit, averaging).  Connect the test leads to the instrument and to the test object.  Press the START/STOP key to start the measurement.

  • Page 41: Set Limit

    MI 3205 TeraOhm XA 5kV Measurements 5.6.1 Set Limit With the high limit the user is allowed to set the limit resistance value. Measured resistance is compared against the limit. Result is validated only if it is within the given limit.

  • Page 42: Diagnostic Test

    MI 3205 TeraOhm XA 5kV Measurements 5.7 Diagnostic test Diagnostic test is a long duration test for evaluating the quality of the insulation material under test. The results of this test enable the decision to be made on the preventive replacement of the insulation material.
  • Page 43 MI 3205 TeraOhm XA 5kV Measurements Diagnostic Test procedure: Select the Diagnostic test function.  Set the test parameters (voltage, timer1 …).  Connect the test leads to the instrument and to the test object.  Press the START/STOP key to start the measurement.

  • Page 44: Dielectric Absorption Ratio (Dar)

    MI 3205 TeraOhm XA 5kV Measurements 5.7.1 Dielectric Absorption Ratio (DAR) DAR is ratio of Insulation Resistance values measured after 30 s and after 1 minute. The DC test voltage is present during the whole period of the test (also an Insulation Resistance measurement is continually running).

  • Page 45: Dielectric Discharge Testing (Dd)

    MI 3205 TeraOhm XA 5kV Measurements Note: When determining Riso (1 min) pay close attention to the capacitance of the test  objects. It has to be charged-up in the first time section (1 min). Approximate maximum capacitance using:  ...
  • Page 46 MI 3205 TeraOhm XA 5kV Measurements Figure 5.16: The current/time diagram of a good and bad insulation tested with dielectric discharge method The dielectric discharge test is very useful for testing a multi-layer insulation. This test can identify excess discharge currents that occur when one layer of a multi-layer insulation is damaged or contaminated.

  • Page 47: Step Voltage Testing

    MI 3205 TeraOhm XA 5kV Measurements 5.8 Step Voltage testing In this test, the insulation is measured in five equal time periods with test voltages from one fifth of the final test voltage up to full scale (Figure 5.17). This function illustrates the relationship of a materials Insulation resistance and its applied voltage.
  • Page 48 MI 3205 TeraOhm XA 5kV Measurements Figure 5.18: Example of Step Voltage test Figure 5.19: Example of Step Voltage result test graph view 0.8Un 0.6Un 0.4Un 0.2Un 0.2T 0.4Ts 0.6Ts 0.8Ts Figure 5.20 Step-up voltage test Warnings: Refer to Warnings chapter for safety precautions! ...

  • Page 49: Withstanding Voltage Test

    MI 3205 TeraOhm XA 5kV Measurements 5.9 Withstanding Voltage Test This function offers Withstanding Voltage Test of insulation material. It covers two types of tests: Breakdown voltage testing of high voltage device, e.g. transient suppressors.  DC withstanding voltage test for insulation coordination purposes.
  • Page 50 MI 3205 TeraOhm XA 5kV Measurements Figure 5.22: Example of Withstanding Voltage test result Figure 5.23 Test voltage presentation without breakdown ......Starting test voltage. START ....... End test voltage......Duration of test ramp. RAMP ......Duration of starting test voltage.

  • Page 51: Communication

    MI 3205 TeraOhm XA 5kV Communication 6 Communication The instrument can communicate with the HVLink PRO PC software. The following action is supported:  Saved results can be downloaded and stored to a PC. A special communication program on the PC automatically identifies the instrument and enables data transfer between the instrument and the PC.

  • Page 52: Maintenance

    MI 3205 TeraOhm XA 5kV Maintenance 7 Maintenance Unauthorized persons are not allowed to open the TeraOhm XA 5kV instrument. There are no user replaceable components inside the instrument, except the battery. 7.1 Batteries insertion and replacement Battery is stored in the battery compartment of the instrument casing under the battery cover (see Figure 7.1).
  • Page 53 MI 3205 TeraOhm XA 5kV Communication Step 3 Replace the battery of the same type. Step 4 Insert the battery correctly and check polarity! Step 5 Fix the battery cover back in place. Ensure batteries are used and disposed of in accordance with Manufacturers guidelines and in accordance with Local and National Authority guidelines.

  • Page 54: Cleaning

    MI 3205 TeraOhm XA 5kV Communication 7.2 Cleaning No special maintenance is required for the housing. To clean the surface of the instrument use a soft cloth slightly moistened with soapy water or alcohol. Then leave the instrument to dry totally before use.

  • Page 55: Technical Specifications

    MI 3205 TeraOhm XA 5kV Technical specifications 8 Technical specifications Nominal test voltage range ......50 V  5 kV Voltage step ..........50 V (50 V – 1 kV) and 100 V (1 kV  5 kV) Voltage output accuracy ......-0%, +10%  10 V @ 100 M load Current capability of test generator ....
  • Page 56 MI 3205 TeraOhm XA 5kV Technical specifications Current Measuring range (A) Resolution (A) Accuracy 1.00  5.00 m 10  100 999  1  10.0  99.9  100 n (5 % of reading + 3 digits) 1.00  9.99 ...
  • Page 57 MI 3205 TeraOhm XA 5kV Technical specifications Dielectric discharge test DD Display range DD Resolution Accuracy 0.01  9.99 0.01 (5 % of reading + 2 digits) 10.0  100.0 Table 8.7: DD display ranges and accuracy 5 kV 2,5 kV Rx [MΩ]...

  • Page 58: General Data

    MI 3205 TeraOhm XA 5kV Technical specifications 8.1 General data Battery power supply ......14.4 V DC (4.4 Ah Li-Ion) Battery charging time ......typical 4.5 h (deep discharge) Battery operation time: Idle state ........... > 24 h Measurements ........> 10 h continues testing 100 MΩ load @ 1 kV ............

  • Page 59: Appendix A - Remote Control

    MI 3205 TeraOhm XA 5kV Appendix A – Remote Control Appendix A – Remote Control Remote Control function is intended for distance control of the instrument MI 3205 TeraOhm XA 5kV via RS232, USB or Bluetooth (optional) communication. Keypad Driving All functionalities of the keypad can be driven via Remote Control communication.

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