1 00:00:19,453 --> 00:00:21,328 Winding Resistance Test 2 00:00:21,406 --> 00:00:26,484 In the "Winding Resistance" tab, the winding resistance test of the "CT" is performed 3 00:00:26,719 --> 00:00:32,109 In this test, a "DC" current is injected into the secondary of the "CT," 4 00:00:32,500 --> 00:00:40,625 the voltage is measured via "Binary Input," and the "DC" resistance is calculated by dividing the voltage by the current 5 00:00:40,938 --> 00:00:44,922 To conduct this test, set the current and test duration 6 00:00:45,156 --> 00:00:51,796 in the "Test Setting" section under the "I test" and "State Time" fields, respectively. 7 00:00:52,343 --> 00:00:56,639 The maximum allowable current for this field is "32" amperes 8 00:00:57,266 --> 00:01:05,390 but a "5" ampere current is sufficient for "5A" CTs 9 00:01:06,016 --> 00:01:12,734 , while a "1" ampere current is adequate for "1A" CTs.In the "Hardware Config" section 10 00:01:13,047 --> 00:01:16,953 the current injection "Output" can be modified under "Wiring Type." 11 00:01:17,500 --> 00:01:22,656 The voltage measurement input can also be selected from the "Voltmeter Contact" section. 12 00:01:23,203 --> 00:01:29,609 Depending on the CT resistance value, inputs "1 to 7" or "Input 10" can be chosen 13 00:01:30,000 --> 00:01:35,156 . If selecting inputs "1 to 7," the "Voltmeter Type" should be set to "wet," 14 00:01:35,547 --> 00:01:39,921 based on the voltage drop across the input terminals. 15 00:01:40,469 --> 00:01:46,718 "Input 10" should be used when the measured voltage is less than 200 millivolts. 16 00:01:47,109 --> 00:01:52,656 . The current measurement in this test is performed via "Actual" current. 17 00:01:54,375 --> 00:01:59,218 In the latest software versions, the "Don't change hardware settings" option 18 00:01:59,609 --> 00:02:07,890 has been removed and replaced with the "Manually" option, available in the "Wiring Type" and "Voltmeter Contact" sections. 19 00:02:15,896 --> 00:02:25,271 By selecting "Insert Rows," test rows will be added according to the number of taps defined in the "Test Object" section. 20 00:02:25,740 --> 00:02:32,771 . If multiple "cores" are included in the "Test Object," the "Insert Mode" section allows adding them 21 00:02:33,240 --> 00:02:40,349 sequentially as "Up" or "Down," or selecting a specific "core" via "Specific Core." 22 00:02:41,599 --> 00:02:51,443 After entering the necessary information, follow the illustrated wiring instructions. You can enlarge the image by double-clicking on it 23 00:03:00,740 --> 00:03:09,724 For wiring, connect "Ia1" to the positive terminal of the capacitor and then to "S1" of the "CT," 24 00:03:10,037 --> 00:03:19,099 and connect "Ian" to the negative terminal of the capacitor and then to "S2" of the "CT." 25 00:03:19,256 --> 00:03:27,302 ." The capacitor box is used to eliminate voltage ripple caused by the inductance of the CT winding. 26 00:03:27,693 --> 00:03:36,052 The latest capacitor box model contains three "5000" microfarad "Bi-Polar" capacitors. 27 00:03:36,912 --> 00:03:42,693 To measure "DC" voltage, connect "Input 1" to the "CT" ahead of the current connectors. 28 00:03:42,928 --> 00:03:49,802 . Then, connect the current source, which is paralleled with the capacitor, to both CT terminals. 29 00:03:50,115 --> 00:03:56,443 To execute the test, select a row in the table, right-click, and choose "Apply Test." 30 00:03:56,834 --> 00:04:02,302 This will apply the current settings, test duration, and hardware configurations 31 00:04:02,537 --> 00:04:09,177 from "Hardware Config," including the device's output and "Binary/Analog Input" settings. 32 00:04:10,115 --> 00:04:15,661 . The test can also be started using the "Run" button in the top toolbar. 33 00:04:16,646 --> 00:04:20,552 Executing the Test and Analyzing Results 34 00:04:21,255 --> 00:04:28,911 After wiring and setting the current and test duration, right-click on any row and select "Apply Test" to run the test. 35 00:04:29,303 --> 00:04:38,991 To modify the current or test duration, make changes in the "Test Setting" section and add a new test row using "Insert Rows." 36 00:04:39,224 --> 00:04:45,630 The test current can also be adjusted from the "I test" column in each row. 37 00:04:46,646 --> 00:04:53,443 Once the test is executed, navigate to "Hardware Configuration" in the "Analog Output" tab 38 00:04:53,599 --> 00:05:03,286 where the wiring is set to "6×32A," and "IL1" is used in this test. 39 00:05:03,990 --> 00:05:09,615 Additionally, "Binary/Analog Input 1" is activated for voltage measurement. 40 00:05:10,162 --> 00:05:16,490 For better analysis, the "Table View," "Detail View," and "Signal View" windows can be used. 41 00:05:17,037 --> 00:05:24,615 In "Table View," two states with zero frequency (DC) are generated according to the "State Setting" data. 42 00:05:24,928 --> 00:05:29,146 . The first state allows the CT current to stabilize, 43 00:05:29,459 --> 00:05:35,474 while the second state measures current and voltage and calculates resistance. 44 00:05:36,021 --> 00:05:40,708 More detailed information can be accessed through the "Detail View." 45 00:05:41,646 --> 00:05:47,661 In "Signal View," the actual waveforms of measured current and voltage are displayed 46 00:05:48,599 --> 00:05:55,318 This feature allows users to analyze the test and verify the correctness of connector 47 00:05:55,553 --> 00:06:00,943 connections using "Actual" values and recorded voltage readings. 48 00:06:01,959 --> 00:06:08,833 After completing the test, results can be viewed in the "Result" section by selecting a row. 49 00:06:14,490 --> 00:06:17,380 The results include "I test act, 50 00:06:17,537 --> 00:06:24,568 "V meas.," resistance at the current temperature, and resistance corrected to the reference temperature. 51 00:06:25,193 --> 00:06:35,427 The "Correction Factor" field calculates the temperature correction factor based on ambient and reference temperatures, as well as the winding material. 52 00:06:36,131 --> 00:06:43,240 This temperature information is entered in the "Test Object" under "Reference Winding," 53 00:06:43,709 --> 00:06:51,130 and "Rcorr" is derived from multiplying ".Rmeas" by "Correction Factor." 54 00:06:51,443 --> 00:06:55,349 In some cases, the winding resistance in the "Test Sheet" 55 00:06:55,740 --> 00:07:02,458 accompanying the "CT" may have been measured at a different temperature than the one stated on the nameplate. 56 00:07:03,006 --> 00:07:10,818 If you need to input this resistance, check the "R Man.(Ref. Temp.)" option. This sets the 57 00:07:11,131 --> 00:07:19,255 entered resistance and its temperature as the reference. Consequently, in the "Resistance Test" tab, 58 00:07:19,646 --> 00:07:27,458 the "Temp. Manufacturer" column is added to the results table, showing the factory-measured temperature. 59 00:07:27,771 --> 00:07:34,568 In the "Assessment" column, if "Rcorr." falls within "Rmin" 60 00:07:35,037 --> 00:07:41,443 " and "Rmax," the test is marked as "Pass"; otherwise, it is marked as "Fail." 61 00:07:41,678 --> 00:07:48,162 After evaluation, test results must be added to the report using the "Add To Report" option. 62 00:07:48,943 --> 00:07:55,115 If specific test parts need to be included or if modifications are required, 63 00:07:53,787 --> 00:08:00,036 use the "Add To Report" gear icon. By clicking this icon, 64 00:08:00,271 --> 00:08:08,552 all selectable items in the report are checkmarked, and unnecessary ones can be unchecked. 65 00:08:09,099 --> 00:08:15,193 Note that test results are not automatically added to the report after each test. 66 00:08:15,678 --> 00:08:20,756 You must manually add them before clearing the test using "Add To Report." 67 00:08:21,146 --> 00:08:27,865 Once added, the report can be edited or deleted using the "Edit & Delete Report" option. 68 00:08:28,646 --> 00:08:38,333 To adjust table column display settings in the test screen or report, right-click on the table, go to "Show/Hide," 69 00:08:38,568 --> 00:08:43,490 and uncheck unnecessary columns under "Report" or "Table." 70 00:08:44,271 --> 00:08:48,880 In the "Hardware Configuration" section, under "Binary/Analog Input," 71 00:08:49,349 --> 00:08:54,739 " the "selectivity" column for the first row is set to "100ms." 72 00:08:55,053 --> 00:09:00,599 This feature ensures automatic voltage measurement with the appropriate "wet" setting 73 00:09:00,912 --> 00:09:06,693 For instance, if the measured voltage exceeds 4.5V, voltage 74 00:09:07,006 --> 00:09:12,630 measurement switches from "wet 4.5" to "wet 30." 75 00:09:12,787 --> 00:09:16,771 If the measured voltage is below the maximum voltage of 76 00:09:17,474 --> 00:09:22,396 "Bin10," use "Input 10" for higher accuracy 77 00:09:23,099 --> 00:09:32,005 If a different wiring configuration for current injection or a customized voltage measurement input is required, select "Manually 78 00:09:56,068 --> 00:10:01,615 ." For example, if the test needs to be conducted with a different "Sample Rate" 79 00:10:01,771 --> 00:10:09,193 " than the default setting, set "Wiring Type" and "Voltmeter Contact" to "Manually," 80 00:10:10,678 --> 00:10:17,084 open "Hardware Configuration," apply the desired changes, and proceed with the test. 81 00:10:28,195 --> 00:10:29,992 Important Notes 82 00:10:30,617 --> 00:10:37,257 If the "Actual Current" is injected by the device but significantly deviates from the set current 83 00:10:37,961 --> 00:10:45,382 it indicates high winding resistance. Two solutions are available: 1) Reduce the injected current 84 00:10:46,086 --> 00:10:53,507 2) Change the wiring to a series current source configuration for higher "Burdon" capacity. 85 00:11:12,492 --> 00:11:20,617 If "Actual Current" is zero, it means the current injection circuit is open. Check the connector connections. 86 00:11:21,555 --> 00:11:31,164 If the measured voltage has high fluctuations or reads zero, it indicates incorrect connector connections.