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RMO40TD DV-Win Software

Test current

It is possible in DV-Win software to enter test current values in two ways. The first way is drop down
menu where you can choose test currents like they are set in device (5 mA, 10 mA, 50 mA, 100 mA, 500
mA, 1 A, 2 A, 5 A, 10 A, 15 A, 25 A, 40 A

). The second option is to choose “Tools”, then “Options” and

then by checking “Test current step 1 A” and OK button it is possible to set all test current from 4 A to 40
A in 1 A step.

Resistance compensation

Resistance compensation is a feature which enables displaying of measured resistance compensated to
reference temperature. This feature is available when controlling RMO40TD from the PC. Two additional
columns of resistance results are displayed in the data table (grid), denoting the compensated resistance
values.

Default temperature values are 25 [



C] for the device under test temperature and 75 [



C] as a reference

temperature. The operator can change resistance compensation parameters such as temperatures or
winding material.

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Summary of Contents for RMO40TD

Page 1: ...RMO40TD T A P C H A N G E R A N A L Y Z E R W I N D I N G O H M M E T E R Manual ...

Page 2: ...d This Manual represents the technical status at the time of printing The product information specifications and all technical data contained within this Manual are not contractually binding IBEKO Power AB reserves the right to make changes at any time to the technology and or configuration without announcement IBEKO Power AB is not to be held liable for statements and declarations given in this M...

Page 3: ...es and currents associated with this equipment and its environment Pay attention to the information provided in the Manual RMO40TD is intended exclusively for the application areas specified in Designated Use The manufacturer and distributors are not liable for damage resulting from wrong usage The user alone assumes all responsibility and risk The instructions provided in this Manual are consider...

Page 4: ... Supply Supply RMO40TD only from a power outlet that is equipped with protective ground Instead of supplying RMO40TD from phase neutral L1 N A N it may also be supplied from phase to phase e g L1 L2 A B However the voltage must not exceed 240 V AC please refer to the section Technical Data Warning This is a class A product In a domestic environment this product may cause radio interference in whic...

Page 5: ...ime has expired In both cases upon completion of the test a measured value of the resistance is recorded to pre selected internal memory location Each time Ω is pressed results of the resistance the ripple and the test current value are stored into the internal memory of RMO40TD and memory location changes to the next one Minimum measurement time is 30 seconds By pressing STOP test could be comple...

Page 6: ...were taken when the unit was in a known good condition and comparing with other phases allows for an efficient analysis Disposition of all current ripple changes or of the current flow on the graph depends on a particular transformer and OLTC design so it is always recommended to compare results obtained on the same unit with previous measurements Note In TapC menu only Ch 1 is the active channel ...

Page 7: ...during resistance measurement in the TapC test Flashes alternately with the green LED during the TapC test Red LED Discharge The red LED just above the red output connector remains lit until the accumulated energy of the measured object is reduced to a harmless level CAUTION Within the period when the discharge LED lights it is prohibited to disconnect measuring cables The discharge diode cannot b...

Page 8: ... mains power supply 0 In this position RMO40TD is separated from the mains power supply with both poles Earth ground connector For protection against parasitic currents or voltages always connect RMO40TD earth ground connector to protective ground PE Use only the original cable For safety reasons always establish this connection as the first one before you do any other connections and separate thi...

Page 9: ... ENTER to select the Set Time and Date menu Move the cursor to the position of your choice using LEFT RIGHT and change the value with ENTER Pressing ENTER to confirm returns you to the Main menu Pressing STOP to cancel returns you to the Main menu Figure 5 3 The Time menu showing RMO40TD s internal time and date ...

Page 10: ...BED IN THE FIGURE 6 1 DO NOT CONNECT MEASURING CABLES AFTER TEST STARTS DO NOT DISCONNECT ANY LEADS BEFORE THE LED DISCHARGE AND THE BUZZER ARE OFF The Figure 6 2 shows simultaneous testing of both windings high and low on a single phase transformer In such a way it is possible to speed up the measurement when two channels are used to test both windings of the transformer When performing a two cha...

Page 11: ...y the internal circulating currents settle very quickly to obtain a balance and discharge with the same speed Even if only one side of the transformer needs to be tested connecting both high and low windings in series will speed up the test considerably On Off Connect the earth ground lead first before doing any connections to the test object Connect the mains lead to a mains outlet 100 V 240 V AC...

Page 12: ...witched over to the next memory position The result can be recalled later by selecting that position number Using RIGHT button move the cursor to the test duration position and using UP DOWN select desired value Measuring with RMO40TD Before a test can be started test current memory position and the test duration time need to be defined using the Current menu Once these parameters are defined pres...

Page 13: ...ay During discharging process it is not possible to start another measurement Once the test is completed the last measured result will remain registered at a selected memory location 000 499 memory locations Discharge Current The voltage at the RMO40TD output generation is immediately stopped but current still flows because of the inductivity of test objects Because of the enormous amount of energ...

Page 14: ...ge selection is performed automatically and therefore is not necessary to be set by the operator Accuracy Typical accuracy of RMO40TD is 0 2 rdg 0 2 FS This accuracy is valid if the maximum possible current is used Always try to use as high current as possible but to avoid the risk of heating the winding it is recommended not to exceed from 10 to 15 of the nominal current of transformer It is impo...

Page 15: ...t the value of your choice by means of the UP DOWN buttons In the TapC menu of RMO40TD current output value is rated continuously at 20 A or less Define the memory position here MEMORY 123 Using RIGHT move the cursor to the memory location position then using UP DOWN select desired memory position to which obtained results would be saved By pushing Ω resistance and current ripple measured results ...

Page 16: ... device is ready to record the current ripple During saving the resistance the red LED flashes shortly and beeper sound is speeded up Change the Tap Changer position to the next tap by pushing Up or Down of the tap changer control Because the resistance is changed current will be unstable and RMO40TD will sample and hold the largest measured current ripple that occurred in the actual measuring cyc...

Page 17: ...urrent ripple value 99 or 100 than a properly functioning tap changer Note Current ripple value depends on the construction of the tap changer It is recommended to compare current ripple values between each other got on one transformer Also it is recommended to compare current ripple results on one transformer with results from some previous test in order to follow conditions of that tap changer F...

Page 18: ...ap refer to section 7 6 6 3 Demagnetization feature Note Before using the demagnetization feature you must unplug the voltage sense cables from the device After the test is done there is a feature to demagnetize the transformer under test To do so press SET consecutively until the DEM menu is selected Once you are in the DEM menu you can select the starting current for the demagnetization process ...

Page 19: ... the discharging process Tap Changer Remote The external Tap Changer Remote cable is used for convenient tap changer testing After the RMO40TD has measured a tap it stands by waiting for the operator to move the transformer tap changer to the next tap position and continue the measurement by pressing OMEGA on the unit The tap changer operation box on power transformers is normally not placed at th...

Page 20: ...ing a memory position on the Memory menu displays the current fed into the test object the memory position of these results the test object s measured resistance R1 left channel channel 1 or R2 right channel channel 2 the test object s measured results RESISTANCE and RIPPLE the date and the time of this particular test Figure 6 23 The Memory menu showing the previously saved test results measured ...

Page 21: ...s well as from TapC menu Select first and last memory position with UP DOWN and press ENTER The results that are located in the range between these memory locations including the chosen memory locations will be printed Note It is not possible to print test results using the built in printer from DV Win Software If printing is attempted the device will be blocked and a reset of the device is necess...

Page 22: ...mperature there is possibility that a built in thermo switches prevents RMO40TD from overheating The following test duration times can be applied at each test current 30 sec 60 sec 90 sec 120 sec 180 sec 240 sec 300 sec 360 sec 420 sec 480 sec 540 sec 600 sec 660 sec 720 sec 780 sec 840 sec 900 sec 1200 sec 1800 sec 3600 sec unlimited C u r r e n t T e s t Test current A Maximal test duration time...

Page 23: ... grid in the form of a table Saved as a PDF XLS DOC or RTF file Every test reading contains The date and the time of the test The transformer connection if selected The test mode The real test current The measured resistance values The measured voltage values The measured ripple values The transition time values The tap changer positions The memory location 7 1 System Requirements 7 1 1 Minimum Co...

Page 24: ...MO40TD can be controlled from the PC The test is started by pressing icon Start new test or selecting the Test button and then selecting New test In case that there is some communication problem it is necessary to check the following Is the green led diode on the RMO40TD lit Is the RMO40TD signaling any error Is the serial cable connected tightly Once the communication is successfully established ...

Page 25: ...rature humidity and pressure 7 5 Current Mode The way to measure the winding resistance is described in detail in the RMO40TD Manual The winding resistance measurement can be performed using DV Win software If you want to analyze these results later you should save them on the hard disk The table can be saved in various formats including XLS so it can be later used with all Excel functions After a...

Page 26: ...to set all test current from 4 A to 40 A in 1 A step Resistance compensation Resistance compensation is a feature which enables displaying of measured resistance compensated to reference temperature This feature is available when controlling RMO40TD from the PC Two additional columns of resistance results are displayed in the data table grid denoting the compensated resistance values Default tempe...

Page 27: ...is interval DV Win reads the last measured result from RMO40TD and this process repeats at the expiration of the next period Possible interval options are Automatic and Manual By selecting Automatic option and time interval sample time the last measured result will be transferred from RMO40TD to PC at the chosen time intervals By selecting Manual option the last measured result will be transferred...

Page 28: ...n all the necessary testing information When Save button is selected a new window will appear which shows a report preview In this window various additional data can be added such as company logo and contact information as well as any comments the user wants to add to the report All the data from the grid will be displayed in the report Refresh report button generates a different report preview Ex...

Page 29: ...ata is saved to Virtual Store directory which is hidden and may prevent user from finding saved files For Windows 7 this is no longer an option We recommend that you save the data in other directories under ownership of the user like Documents or some other user created directory 7 6 Tap Changer Mode Using a PC together with RMO40TD device in the Tap Changer mode it is possible to assess the tap c...

Page 30: ...aph Graph control window contains options and commands to control graph display Graph is displayed in separate window where user can zoom in and zoom out interesting parts of the graph Test current values are shown on the vertical axis and tap transitions are shown on the graph Before the test is started it is necessary to set the following tap changer parameters Standard tap changer Before the be...

Page 31: ... Custom tap changer This option is more flexible and intended if you want to manually enter tap positions Notice that the list of tap changer positions shall be comma separated Static resistance graph Selecting Show static resistance graph option enables drawing a graph with resistance value in each tap position It is possible to have a graph of all three phases on the same diagram To do so it is ...

Page 32: ...s results in the results table Tools Options Advanced settings for the tap changer graphic function These settings are recommended for advanced users Test current It is possible in DV Win software to enter test current values in two ways The first way is drop down menu where you can choose test currents like they are set in device 5 mA 10 mA 50 mA 100 mA 500 mA 1 A 2 A 5 A 10 A 15 A 25 A 40 A The ...

Page 33: ...ted test current Settings During every tap changer test with DV Win the dynamic resistance graph is automatically generated This graph will be named auto_save_date_and_time tcp and it will be saved in My Documents DV Power RMOT folder by default In case the test is interrupted for any reason this file will show the dynamic resistance graph until the last successfully completed tap changer transiti...

Page 34: ...nt when R has a value close to zero it means that measured resistance has stabilized Once the resistance is stable the operator has to press OMEGA to record resistance in the first tap changer position Measured resistance value is saved in current memory location and memory location is automatically changed to the next position After the message appears press OK ...

Page 35: ... during those tests when the RMO40TD unit is controlled by the DV Win software This feature is always active in the DV Win which means that two diagrams will always be visible on the graph When the graph is displayed and R is stable press OMEGA to measure resistance in the new tap changer position Repeat this procedure until you get the diagram for each transition and the resistance result in each...

Page 36: ...ever you release PAUSE the DV Win continues to record the graph transitions dynamic resistance Once the measurement is completed save the data The graph can be saved as the graph with three different resolutions High resolution is 0 1 ms Medium resolution is 1 ms Low resolution is 4 ms The graph analysis The graph can be analyzed online and offline It is possible to zoom in a part of the graph of ...

Page 37: ...the graph Zoom Out To zoom out the graph each click will zoom out the graph for 20 related to the center of the graph Undo To return to previous zoom level Default scale Enables to see complete graph from zero to the maximum value Auto scale Enables to see complete graph from minimum to the maximum value An example of one complete graph is shown on the picture below ...

Page 38: ...nd dragging the cursor along the graph Using mouse for Zoom function Zoom In Zoom Out function is possible using the mouse If no cursors are displayed then drag around the area on the graph using the left mouse button If cursors are displayed Shift left mouse button is used Using keyboard for Zoom function Zoom In Zoom Out function is possible using the keyboard The up arrow is used to zoom it in ...

Page 39: ...sistance values in the grid Open 1 In your DV Win program click on the Open tab 2 In the Look in list click the drive folder that contains the file you want to open 3 In the folder list locate and open the folder that contains the file 4 Click the file which you want to open and then click Open Saved files containing graph data can be opened using the Open button and selecting file tcp to open tap...

Page 40: ... current used for the last test is displayed as a default one The demagnetization is performed by pressing START Note Never remove the current leads during the demagnetization process and always allow enough time for the transformer being tested to completely demagnetize Large transformers can require several minutes to demagnetize During the demagnetization process the transformer will be charged...

Page 41: ...er the DV Win software allows simple and precise calculation of exact winding resistance values First it is necessary to measure the resistance values between two corresponding terminals of the transformer Three measurements are necessary between U and V U and W and finally between V and W These measurements are performed in the Current tab of DV Win and the results are stored in three different m...

Page 42: ...from internal memory of the RMO40TD since they are not saved in the instrument but on a PC hard drive You can select the results you want to transfer from the RMO40TD memory to the PC according to following criteria All All the test results are being transferred from the internal RMO40TD memory to the PC Memory range It opens a new window that allows a choice of memory locations to be transferred ...

Page 43: ...s are going to be transferred to the PC Current range Selecting this option opens a new window providing a selection of the currents that were used during the test The choice of the current is made on the drop down menu The range of the values that are between and including the selected values of the current are going to be transferred to the PC Ripple range Selecting this option opens a new windo...

Page 44: ...nsferred to the PC in the data table the following layout will be displayed Current mode Date and Time the date and the time of the test Current the real test current Voltage 1 the measured voltage on the channel 1 Ch 1 Resistance 1 the measured resistance on the channel 1 Ch 1 Voltage 2 the measured voltage on the channel 2 Ch 2 Resistance 2 the measured resistance on the channel 2 Ch 2 Ripple th...

Page 45: ...t 8 2 Error Message Connection CH1 2 Connection CH1 The Error message Connection CH1 2 is displayed if both CH1 and CH2 are not connected in the Current mode This message is displayed if either or voltage sense cable or both are disconnected either on the device side or the side of the test object The Error message Connection CH1 is displayed only if CH1 is not connected in the TapC mode This mess...

Page 46: ...ter starting the test error message will not show up and the received results will be erroneous 8 4 Error Message Change Current This message is displayed if during the test the voltage at the test object is too high In this case reduce the test current and repeat the test In case when test voltage is not higher than 10 V per channel but test current is still improperly high for that resistance er...

Page 47: ...ation The message Check paper is displayed if the printer is out of paper The paper roll should be aligned with the paper intake without horizontal offset and central axis of the paper roll must be parallel with the printer as shown at Figure 8 7 Also pay attention to insert paper in proper way to the printer since it must enter paper intake from the lower side of paper roll In case that the paper...

Page 48: ...conditions Altitude below 2000 m Temperature 10 C 55 C 14 F 131 F Maximum relative humidity 95 for temperatures up to 31 C decreasing linearly to 40 relative humidity at 55 C Mains supply voltage fluctuations up to 10 of the nominal voltage Installation overvoltage category II Pollution degree 2 9 5 Dimensions and Weight Dimensions 502 mm x 190 mm x 395 mm W x H x D 19 75 in x 7 48 in x 15 53 in W...

Page 49: ...ble RMO40TD N 00 Current clamp 20 200A cable set 5 m CACL 0200 00 Mains power cable MPCXXA XX 00 Ground PE cable RMO40TD N 00 Cable bag CABLE BAG 00 Optional Article No Current cables 2 x 15 m 10 mm with battery clips C2 15 10LMB1 Sense cables 2 x 2 x 15 m with alligator clips S2 15 02BPA2 Built in Tap Changer Control Unit 5 m control cable TAPCCU 05 00 Cable plastic case CABLE CAS 00 Test shunt 1...

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