1 00:00:18,516 --> 00:00:20,625 Secondary Burden Test 2 00:00:21,016 --> 00:00:25,468 In this test, the burden connected to the secondary side of the CT is measured 3 00:00:25,938 --> 00:00:30,860 . By injecting AC current and measuring the AC voltage through the "Binary/Analog Input," 4 00:00:31,016 --> 00:00:37,109 and then dividing voltage by current, the impedance value "Z" and its phase angle are obtained. 5 00:00:37,266 --> 00:00:43,750 . From these, the resistance "R" and reactance "X" of the secondary circuit can be determined 6 00:00:44,141 --> 00:00:50,390 To perform this test, you need to enter the test current and test duration in the "Test setting" section 7 00:00:50,547 --> 00:00:54,218 specifically in the "I test" and "State Time" fields 8 00:00:54,688 --> 00:00:59,062 The current limit for this test is set to 32 amps. However, 9 00:00:59,375 --> 00:01:06,406 , injecting 5 amps is sufficient for 5 A CTs, 10 00:01:07,422 --> 00:01:14,531 and 1 amp for 1 A CTs.In the "Hardware Config" section, you can change the current injection output via the "Wiring Type" setting 11 00:01:15,078 --> 00:01:21,875 The voltage measurement input can be selected from the "Voltmeter Contact" dropdown, depending on the CT's resistance 12 00:01:22,500 --> 00:01:26,015 . Inputs 1 to 7 or input 10 may be used. 13 00:01:26,563 --> 00:01:33,829 If you choose inputs 1 to 7, the "Voltmeter Type" can be set to "wet" depending on the voltage across the selected input 14 00:01:34,844 --> 00:01:39,921 Input 10 should be used when the measured voltage is less than 200 millivolts 15 00:01:40,547 --> 00:01:47,890 Current measurement during this test is done either via the actual current ("Actual") or through "Input 9" 16 00:01:48,828 --> 00:01:55,234 By selecting the "Insert Rows" option, test rows are added based on the number of taps defined 17 00:01:55,469 --> 00:02:01,875 defined in the "Test Object" section.If more than one "Core" has been entered in the "Test Object", 18 00:02:02,031 --> 00:02:08,906 you can use the "Insert Mode" to add all of them to the test rows in either "Up" or "Down" order 19 00:02:09,334 --> 00:02:15,036 Alternatively, you can add a specific "Core" to the list by selecting "Specific Core". 20 00:02:15,349 --> 00:02:21,286 In the newer versions of the software, the option "Don’t change hardware settings" has been removed 21 00:02:21,678 --> 00:02:28,786 Instead, you can use the "Manually" option, which is available under both "Wiring Type" and "Voltmeter Contact". 22 00:02:29,256 --> 00:02:35,661 After entering the information in the "State Setting" section, follow the wiring diagram shown 23 00:02:48,162 --> 00:02:54,412 Note that you can double-click the image to enlarge it for better visibility 24 00:03:11,365 --> 00:03:21,208 To perform this test, the first step is to disconnect the CT from all components that transmit current to the measuring equipment 25 00:03:52,849 --> 00:03:57,615 . In the default wiring configuration, connect the output phase currents 26 00:03:58,162 --> 00:04:03,630 "Ia1" and "Ian" to the current-carrying path of the CT. 27 00:04:04,178 --> 00:04:12,380 To measure the "AC" voltage, connect "Binary/Analog Input 1" to the test path, ahead of the current injection connectors. 28 00:05:01,490 --> 00:05:07,661 To run the test, select one of the rows in the table, right-click on it, and choose "Apply Test" 29 00:05:07,818 --> 00:05:10,786 This action applies the current settings 30 00:05:11,178 --> 00:05:16,178 test duration, and all relevant hardware configurations under "Hardware Config" 31 00:05:16,646 --> 00:05:21,177 including the device’s outputs and "Binary/Analog Inputs". 32 00:05:21,802 --> 00:05:30,553 Alternatively, after selecting the desired row, you can also start the test by clicking the "Run" button in the top toolbar 33 00:05:31,568 --> 00:05:34,224 Running the Test and Analyzing the Results 34 00:05:34,536 --> 00:05:39,223 Once the wiring is complete and the current and time values have been set 35 00:05:39,302 --> 00:05:43,364 , right-click on a row and select "Apply Test" to start the test. 36 00:05:43,678 --> 00:05:48,990 If you need to adjust the current or test time, make the changes in the "Test Setting" section, 37 00:05:49,224 --> 00:05:52,662 then click "Insert Rows" to add a new test row 38 00:05:53,053 --> 00:05:57,661 . You can also directly modify the test current in the "I test" column of each row. 39 00:05:58,131 --> 00:06:08,208 After running the test, in the "Hardware Configuration" section, under the "Analog Output" tab, you will see that the device wiring is set to 40 00:06:08,599 --> 00:06:16,255 "6×32A" and "Binary/Analog Input 1" has been activated for voltage measurement. 41 00:06:25,099 --> 00:06:31,271 For a more detailed test analysis, you can use the "Table View," "Detail View," and "Signal View" windows. 42 00:06:31,818 --> 00:06:39,318 Once you open the "Table View" window, you will see that a "State" with a frequency of "50Hz" has been created, 43 00:06:39,709 --> 00:06:43,771 in accordance with the data entered in the "State Setting" section 44 00:06:44,084 --> 00:06:49,786 If you need more detailed information from the "Table View," you should use the "Detail View" window. 45 00:06:51,584 --> 00:07:00,255 In "Signal View," you can observe the current waveform and its "Actual" value, as well as the voltage measured by "Binary/Analog Input." 46 00:07:00,568 --> 00:07:09,396 ." Using the "Actual" current and voltage waveforms in "Signal View," you can verify the correctness of the connector connections. 47 00:07:09,631 --> 00:07:14,474 . In the "Result" section, after the test is completed, the results will be displayed. 48 00:07:14,709 --> 00:07:20,880 These results include "I test act," the actual injected current, "Vmeas.," 49 00:07:21,271 --> 00:07:28,458 the measured voltage, "Z," the impedance, "Angle," the impedance angle 50 00:07:28,771 --> 00:07:33,224 and finally, the values of "R" and "X" calculated using the formulas 51 00:07:33,615 --> 00:07:41,193 "Z Cos(φ)" and "Z Sin(φ)." In the "Burden @ Itest" field, the burden 52 00:07:41,428 --> 00:07:47,756 that the secondary "CT" can provide during the test current is calculated and entered by the software. 53 00:07:47,990 --> 00:07:54,708 The last column shows "cos φ." Finally, after the test is completed, 54 00:07:55,021 --> 00:08:02,443 the evaluation results need to be added to the report, which can be done by selecting "Add To Report" during equipment testing. 55 00:08:02,990 --> 00:08:06,583 If you want to include specific parts of the evaluation 56 00:08:06,896 --> 00:08:12,130 evaluation in the report or edit the report, you must use the "Add To Report" gear icon. 57 00:08:12,678 --> 00:08:19,240 By clicking on this gear, the items that can be added to the "Report" will be checked 58 00:08:20,178 --> 00:08:24,552 and if you don't need any of these items, you can uncheck them 59 00:08:25,256 --> 00:08:31,661 Please note that after each test, the results are not automatically added to the report 60 00:08:32,131 --> 00:08:39,396 You must manually add the test results to the output report by clicking "Add To Report" before selecting "Clear Test." 61 00:08:40,803 --> 00:08:45,803 Additionally, if you want to adjust the settings for displaying the table columns 62 00:08:46,427 --> 00:08:50,646 on the test page or in the report, you can right-click on the table 63 00:08:51,037 --> 00:08:55,568 go to "Show/Hide," and if you don't need a specific column 64 00:08:55,724 --> 00:08:59,552 you can uncheck it in the "Report" or "Table" section. 65 00:09:00,021 --> 00:09:07,833 If the "Burden" of the path is low and you need a more accurate measurement, you can set the "Voltmeter Contact" to "Input 10." 66 00:09:08,381 --> 00:09:15,958 Or, if "Input 1" is experiencing issues, you can select a different input in the "Voltmeter Contact" section. 67 00:09:16,271 --> 00:09:24,943 Also, to change the injected current output, you can select the desired current output from the "Wiring Type" section 68 00:09:25,646 --> 00:09:32,833 Furthermore, if you want to conduct the test with different settings—for example, you want the current injection to be set to 69 00:09:33,068 --> 00:09:42,130 "1×128A" and voltage measurement to be done with a "Sample rate" of 1.2 milliseconds 70 00:09:42,521 --> 00:09:48,380 you can set the "Wiring Type" and "Voltmeter Contact" to "Manually," open "Hardware Configuration," 71 00:09:48,537 --> 00:09:54,865 and apply the necessary changes. Then you can perform the test with the new settings. 72 00:11:18,180 --> 00:11:21,460 It is important to note a few things 73 00:11:21,538 --> 00:11:28,256 If the current injected by the device ("Actual Current") differs significantly from the set current, 74 00:11:28,569 --> 00:11:33,959 the wiring resistance is high, and in this case, two actions can be taken 75 00:11:34,273 --> 00:11:40,445 1) Reduce the injected current. 2) Change the wiring to series 76 00:11:41,227 --> 00:11:47,867 series current sources to provide a higher "Burden." Another point is that a reading of zero 77 00:11:48,179 --> 00:11:57,631 for "Actual Current" indicates an open current injection path; in this case, the connector connections should be checked.