1 00:00:18,546 --> 00:00:20,053 Resistance Test 2 00:00:20,109 --> 00:00:26,107 By clicking on “Resistance” on the “Start” page of the software, ohm resistance test room opens. 3 00:00:26,132 --> 00:00:32,000 In this room it is possible to measure ohm resistance of various equipment in the “Resistance Test” tab. 4 00:00:32,025 --> 00:00:33,875 “Test Object” and “Megger Test Report” 5 00:00:33,900 --> 00:00:40,481 ” tabs are used to enter the nominal information of the equipment and the results of the “Megger” test, respectively. 6 00:00:40,506 --> 00:00:41,762 “Test Object” tab: 7 00:00:41,787 --> 00:00:45,931 To perform a test, every module needs information about the equipment. 8 00:00:45,956 --> 00:00:48,470 This information is entered in “Test Object”. 9 00:00:48,495 --> 00:00:56,634 In “Resistance Data” section, the general information about the piece of equipment which is to be recorded in the output report is entered. 10 00:00:56,659 --> 00:01:02,126 The name of the equipment, serial number, name of manufacturer, type, name of company, 11 00:01:02,151 --> 00:01:13,704 name of country and the address to the location and the power station where the equipment is installed are entered in “Name of Device”, “Serial Number”, “Manufacturer”, “Type”, “Company”, 12 00:01:13,729 --> 00:01:18,196 “Country” and “Station” fields, respectively, to be added to the report. 13 00:01:18,221 --> 00:01:22,782 In “Resistance” section, the temperature and ohm range of the equipment are entered. 14 00:01:22,822 --> 00:01:32,579 The ambient temperature is entered in “Ambient Temperature” field while the temperature correction factor in accordance with the current ambient temperature and the reference temperature, 15 00:01:32,619 --> 00:01:44,010 and also the coil material, the amount of ohm resistance, and Dev+ and Dev- of the resistance tolerance are entered in “Temperature Correction Factor” field. 16 00:01:44,035 --> 00:01:51,310 In “Extra Data” section, the date of testing in Gregorian calendar, the information of the performer of the test, 17 00:01:51,335 --> 00:01:58,445 and the information of the supervisor are entered in “Date”, “Tested By” and “Approved By” fields, respectively. 18 00:01:58,470 --> 00:02:04,859 The RMS value of each parameter is calculated based on the average of several time periods. 19 00:02:04,884 --> 00:02:12,804 The bigger number of time periods, the longer the calculation takes which consequently leads to higher accuracy and less fluctuations. 20 00:02:12,829 --> 00:02:17,976 The number of time periods is eneterd in Averating field in Noise Suppression section. 21 00:02:18,001 --> 00:02:23,195 This field is the same as No. of Period field in Setting in Signal View window. 22 00:02:23,234 --> 00:02:33,359 By clicking “Add to Report” option at the box at the bottom of the screen, this information is added to the report and a message saying “Report was added to the list” is displayed. 23 00:02:33,384 --> 00:02:38,373 It is possible to view the report by selecting “Report” window from the right toolbar. 24 00:02:38,398 --> 00:02:45,919 By clicking on “Delete Report” in the “Delete from Report” window, the added report is removed from the “Report” window. 25 00:02:45,944 --> 00:02:48,779 If “Set as Default” is selected, 26 00:02:48,804 --> 00:02:56,278 the entered information is set as default and displayed every time the “Resistance” room is opened. 27 00:02:57,139 --> 00:02:59,518 Resistance Test” tab 28 00:02:59,543 --> 00:03:10,247 To perform this test, it is necessary to enter the test current, time and the intended input for measuring the voltage in “State Setting” section in “I test”, 29 00:03:10,272 --> 00:03:14,215 “State Time” and “Analog Input Target” fields, respectively. 30 00:03:14,240 --> 00:03:21,893 Also, if the resistance of the equipment is low and you wish to have a more accurate measurement, it is recommended to select “Input 10”. 31 00:03:21,918 --> 00:03:32,707 In the next step, the connection type is to be selected from among “D-3ph, Y-3ph and Yn-3ph/1ph” in “Object Type” section. 32 00:03:32,732 --> 00:03:34,479 Resistance Test 33 00:03:34,504 --> 00:03:40,322 If the single-phase or three-phase equipment which is to be tested is star point grounded, 34 00:03:40,347 --> 00:03:50,213 the first radio button should be selected and the wiring should be adjusted in accordance with the range of the injected current as well as the voltage level as can be seen in the figure. 35 00:03:50,238 --> 00:03:58,291 equivalent circuit for this type of wiring is displayed as follows and the ohm resistance is calculated using the following relation: 36 00:03:58,316 --> 00:04:10,799 For a three-phase equipment without a null point the second radio button should be selected and the wiring should be adjusted in accordance with the range of the injected current as well as the voltage level as can be seen in the figure. 37 00:04:10,824 --> 00:04:19,057 The equivalent circuit for this type of wiring is displayed as follows and the ohm resistance is calculated using the following relation: 38 00:04:19,089 --> 00:04:28,072 In D-3ph method, the wiring is adjusted in accordance with the range of the injected current and the voltage level as can be seen in the figure. 39 00:04:28,097 --> 00:04:36,322 The equivalent circuit for this type of wiring is displayed as follows and the ohm resistance is calculated using the following relation: 40 00:04:36,347 --> 00:04:40,166 The voltage measurement mode is specified in “Voltage Measurement Mode”. 41 00:04:40,191 --> 00:04:45,299 Since the method used to measure the resistance is dividing the voltage difference by the current, 42 00:04:45,324 --> 00:04:49,752 “Range” of the “Inputs” voltage is effective in measuring the accuracy of resistance. 43 00:04:49,777 --> 00:04:59,884 Therefore, for measuring the resistance, one of the inputs of this section should be selected in accordance with the coil resistance and the maximum resistance specified for every “Input”. 44 00:04:59,909 --> 00:05:03,041 If the resistance is greater than the selected “Range”, 45 00:05:03,066 --> 00:05:05,736 the device shows an “Overvoltage” error. 46 00:05:05,761 --> 00:05:11,799 In this case, either the current must be decreased or the resistance measurement “Range” must be increased. 47 00:05:11,824 --> 00:05:17,282 In case of facing an “Error Other” of the current outputs, the current needs to be decreased. 48 00:05:17,307 --> 00:05:20,017 Running the test and analyzing the results 49 00:05:20,042 --> 00:05:27,165 To begin the test, first in Test Object 200 milli ohm, 50 milil ohm, 10 amps, 50 00:05:27,196 --> 00:05:39,264 1 second are specified as ohm resistance, upper and lower tolerance, current and test duration, respectively;input 2 is selected for“Analog Input Target”. 51 00:05:39,289 --> 00:05:49,271 Then, Object Type is set at “Yn-3ph/1ph” and “Voltage Measurement Mode” is set at Up to 28V 52 00:05:49,296 --> 00:05:53,638 and since the approximate resistance is smaller than 200 milli ohm, 53 00:05:53,663 --> 00:06:01,639 Max Voltage is set at Up to 4.5V and then wiring is adjusted according to the figure. 54 00:06:01,664 --> 00:06:06,921 It should be noted that it is possible to magnify the figure by double-clicking on it. 55 00:06:06,946 --> 00:06:17,999 In this wiring, “lA1” and “lB1” current output phases are “Jumpered” and “lA2” and “lB2” phases are directly connected to the equipment. 56 00:06:18,024 --> 00:06:25,686 To measure the voltage difference, it is necessary to connect “Input2” to the test and further ahead of current injection connectors. 57 00:06:25,711 --> 00:06:34,772 It should be noted that before running the test it is necessary to click on “Init Test” so that the device “config” is adjusted automatically. 58 00:06:34,797 --> 00:06:42,983 By selecting this option, the settings related to current and test time as well as the hardware configurations related to “Hardware Configuration” 59 00:06:43,016 --> 00:06:49,522 including outputs of the device and “Binary/Analog Inputs” are adjusted automatically by the software. 60 00:06:49,547 --> 00:06:57,358 In “Analog Output” tab in “Hardware Configuration” section, you can see that the wiring of the device is set at “32A” 61 00:06:57,383 --> 00:07:04,990 with the maximum “Burden” of 400 milli amps and “Binary/Analog Input” #2 are activated to measure the voltage. 62 00:07:05,015 --> 00:07:06,693 After performing the test, 63 00:07:06,718 --> 00:07:16,522 in “Signal View” it is possible to view the current waveform along with its “Actual” values and the measured voltage and also examine the connections of the connectors. 64 00:07:16,564 --> 00:07:25,759 After the test is finished, the test results can be viewed in “Result” section. 65 00:07:25,784 --> 00:07:35,814 The results include “linj”, “Vmeas”, “Rmeas*C.F” and “Rdev” which refer to the amount of injected current, 66 00:07:35,839 --> 00:07:47,414 the measured voltage, the measured impedance and the difference between the nominal resistance and the resistance specified in “Rmeas*C.F” field, respectively. 67 00:07:47,439 --> 00:07:55,080 It should be noted that by holding the cursor on either of these two fields, the relations related to them are displayed. 68 00:07:55,105 --> 00:07:57,775 In the end, after the test is finished, 69 00:07:57,800 --> 00:08:06,127 it is necessary to add the evaluation results to the report which is done by selecting “Add To Report” in equipment test. 70 00:08:06,152 --> 00:08:16,220 Also, if the user wishes to add specific parts of the evaluation to the report or edit the report, they need to use “Add to Report” cog. 71 00:08:16,245 --> 00:08:26,197 By clicking on this cog, the items that can be added to the “Report” are checked and the user can simply uncheck any of them which they do not need. 72 00:08:26,235 --> 00:08:42,454 It should be noted that the results are not automatically added to the report after each test when a test is performed it is necessary to add the test results to the output report by selecting “Add To Report” before “Clearing the Test”. 73 00:08:42,479 --> 00:08:50,673 Also, if one of the “Analog Outs” is faulty, the specified “Binary Out” should be changed; ; to do this, you must first click on "Init Test", then tick "Don't Change Hardware Setting" option and by going to the "Hardware Configuration" window, in the "Analog Out" tab, "Output Target" change the selected wiring according to the wiring. 74 00:08:50,698 --> 00:09:07,766 Two notable points about performing this test are that „Error Other“ during a test indicates that there is a problem in connection of the wirings or the resistance is too high that the device unable to provide the required „Burden“ for current injection. 75 00:09:07,791 --> 00:09:13,305 Therefore, in cases of facing this error, examine the „Actual“ current value in „Signal View“. 76 00:09:13,330 --> 00:09:24,821 If the current is injected from the device („Actual Current“) but its difference with the specified current is too big it means that the resistance is too high while if the „Actual Current“ is zero, 77 00:09:24,846 --> 00:09:28,125 this means that the route current injection is open. 78 00:09:28,150 --> 00:09:37,954 In cases where the resistance is too high, the test current needs to be decreased while if the „Actual Current“ is zero, the connection of the connectors needs to be examined. 79 00:09:37,979 --> 00:09:45,046 The second important point is that the voltage read by the binaries of the device must have similar cycles. 80 00:09:45,071 --> 00:09:53,679 If the read values have a too big or zero tolerance, this means that the connectors are not properly connected. 81 00:09:53,704 --> 00:10:01,453 Since some users perform a “Megger” test for this equipment and they may need the results in a report, 82 00:10:01,486 --> 00:10:09,867 it is possible for them to enter their intended line and column in “Megger Test Report” tab and by selecting “Insert”, 83 00:10:09,892 --> 00:10:19,031 create their needed table and after inserting the test results and selecting “Add to Report”, add the information to the output report. 84 00:10:19,056 --> 00:10:26,859 Other options such as “Delete Report”, “Export” and “Import” are used to remove the information of this page from the report, 85 00:10:26,884 --> 00:10:35,312 exporting the output file only from the information of this page and importing it if necessary, respectively. 86 00:10:35,351 --> 00:10:46,437 Also, if the user wishes to set the characteristics of the created line and column as default for this section of the room, they can use “Set as Default” option.