1 00:00:24,000 --> 00:00:24,050 C 2 00:00:24,051 --> 00:00:24,101 CT 3 00:00:24,102 --> 00:00:24,152 CT 4 00:00:24,153 --> 00:00:24,203 CT r 5 00:00:24,204 --> 00:00:24,254 CT ra 6 00:00:24,255 --> 00:00:24,305 CT rat 7 00:00:24,306 --> 00:00:24,356 CT rati 8 00:00:24,357 --> 00:00:24,406 CT ratio 9 00:00:24,407 --> 00:00:24,457 CT ratio 10 00:00:24,458 --> 00:00:24,508 CT ratio a 11 00:00:24,509 --> 00:00:24,559 CT ratio an 12 00:00:24,560 --> 00:00:24,610 CT ratio and 13 00:00:24,611 --> 00:00:24,661 CT ratio and 14 00:00:24,662 --> 00:00:24,712 CT ratio and p 15 00:00:24,713 --> 00:00:24,763 CT ratio and po 16 00:00:24,764 --> 00:00:24,814 CT ratio and pol 17 00:00:24,815 --> 00:00:24,864 CT ratio and pola 18 00:00:24,865 --> 00:00:24,915 CT ratio and polar 19 00:00:24,916 --> 00:00:24,966 CT ratio and polari 20 00:00:24,967 --> 00:00:25,017 CT ratio and polarit 21 00:00:25,018 --> 00:00:25,068 CT ratio and polarity 22 00:00:25,069 --> 00:00:25,119 CT ratio and polarity 23 00:00:25,120 --> 00:00:25,170 CT ratio and polarity t 24 00:00:25,171 --> 00:00:25,221 CT ratio and polarity te 25 00:00:25,222 --> 00:00:25,272 CT ratio and polarity tes 26 00:00:25,273 --> 00:00:25,322 CT ratio and polarity test 27 00:00:25,323 --> 00:00:25,373 CT ratio and polarity test 28 00:00:25,374 --> 00:00:25,424 CT ratio and polarity test w 29 00:00:25,425 --> 00:00:25,475 CT ratio and polarity test wi 30 00:00:25,476 --> 00:00:25,526 CT ratio and polarity test wit 31 00:00:25,527 --> 00:00:25,577 CT ratio and polarity test with 32 00:00:25,578 --> 00:00:25,628 CT ratio and polarity test with 33 00:00:25,629 --> 00:00:25,679 CT ratio and polarity test with c 34 00:00:25,680 --> 00:00:25,729 CT ratio and polarity test with cu 35 00:00:25,730 --> 00:00:25,780 CT ratio and polarity test with cur 36 00:00:25,781 --> 00:00:25,831 CT ratio and polarity test with curr 37 00:00:25,832 --> 00:00:25,882 CT ratio and polarity test with curre 38 00:00:25,883 --> 00:00:25,933 CT ratio and polarity test with curren 39 00:00:25,934 --> 00:00:25,984 CT ratio and polarity test with current 40 00:00:25,985 --> 00:00:26,035 CT ratio and polarity test with current 41 00:00:26,036 --> 00:00:26,086 CT ratio and polarity test with current m 42 00:00:26,087 --> 00:00:26,137 CT ratio and polarity test with current me 43 00:00:26,138 --> 00:00:26,187 CT ratio and polarity test with current met 44 00:00:26,188 --> 00:00:26,238 CT ratio and polarity test with current meth 45 00:00:26,239 --> 00:00:26,289 CT ratio and polarity test with current metho 46 00:00:26,290 --> 00:00:26,340 CT ratio and polarity test with current method 47 00:00:26,341 --> 00:00:26,391 CT ratio and polarity test with current method: 48 00:00:26,392 --> 00:00:27,092 CT ratio and polarity test with current method: 49 00:00:27,117 --> 00:00:31,409 To perform a ratio and polarity test you should use “Ratio and Polarity Test (With Current)” tab. 50 00:00:31,434 --> 00:00:42,559 In this tab, turns ratio, polarity and phase deviation between “CT” primary and secondary is performed where “AC” current is injected and the secondary current is measured through “Input9”. 51 00:00:42,818 --> 00:00:51,482 To perform this test, you need to enter the current and time of the test in “State Setting”, in “I test” and “State Time” fields respectively. 52 00:00:51,507 --> 00:00:54,844 Before initiating the test some points must be considered. 53 00:00:54,869 --> 00:01:02,890 The first point is that the current limit is “128” amps while the “Binary/Analog Input9” limit is “500” milliamps. 54 00:01:02,915 --> 00:01:12,217 But since in sometimes the “CT” secondary current exceeds “500” milliamps which damages the “Input9”, “Icalc” is limited to “450” milliamps. 55 00:01:12,242 --> 00:01:19,220 This means that you can increase the primary as much as that “Icalc” does not exceed “450” milliamps. 56 00:01:19,244 --> 00:01:28,486 The second point is that if the route resistance is too high and the device is not able to provide the needed “Burden”, to perform the test you should decrease the resistance. 57 00:01:28,510 --> 00:01:31,056 To do so, you can parallel “4” pieces of wire. 58 00:01:31,080 --> 00:01:37,923 The third point is that if even by using “4” pieces of wire the problem is not solved, you need to decrease the current. 59 00:01:37,947 --> 00:01:44,613 Note that the test current must be based on the standard because the software uses it to assess the test. 60 00:01:44,637 --> 00:01:58,327 The table made in this section is the basic standard for test assessment where the allowed turns ratio error and phase deviation are specified in percent and “minute” for classes of protection and measurements “CTs”. 61 00:01:58,351 --> 00:02:06,724 In turns ratio section, the allowed error for different percentages of nominal current and in the “phase” section allowed error is specified in minute. 62 00:02:06,748 --> 00:02:18,899 For example, for a “Measuring CT” with the class of “0.5”, in “5” percent of the nominal current, “1.5” percent turns ratio and “90” minutes of phase deviation error are allowed. 63 00:02:18,924 --> 00:02:25,028 But for “Protection”CTs mode, the maximum error is determined independently from the primary current. 64 00:02:25,053 --> 00:02:36,016 For example, for a “Protection CT” with the accuracy class of “10P10”, the maximum allowed turns ratio error is “3” percent and there is no limitation mentioned for phase deviation. 65 00:02:36,040 --> 00:02:41,532 After entering the information in “State Setting”, you should set the wiring according to the picture. 66 00:02:44,634 --> 00:02:57,706 In this wiring ,short circuit “Ia1”, “Ib1”, “Ia2” and “Ib2” together and “Ia3”, “Ib3”, “Ia4” and “Ib4” together and then according to the picture, 67 00:02:57,730 --> 00:03:08,680 connect a wire to “Ia1” and “Ib4” phases after passing it through the “CT”. To measure the secondary current, connect “Input9” to “S1” and “S2”. 68 00:03:12,100 --> 00:03:25,563 After wiring, for “CT Protection 500/1”, “10” percent of the nominal current which equals “50” amps and “1” seconds as time are entered and the test runs after “Init Test” is pressed. 69 00:03:33,126 --> 00:03:38,368 You can view the “States” created by the software in “Table View”. 70 00:03:38,717 --> 00:03:46,593 If “At Calibration State” is checked, in the first state (with zero current), the secondary is measured and is deducted from the final result. 71 00:03:47,172 --> 00:03:51,054 The second state is the same as the specified test current. 72 00:03:51,212 --> 00:03:57,742 Note that if “At Calibration State” is not checked, the noise is not removed from the response. 73 00:03:58,059 --> 00:04:07,296 In “Signal View” section, the waveform of the specified current along with its “Actual” values and the current measured by “Input9” can be viewed. 74 00:04:07,518 --> 00:04:12,621 After the test is finished, the results can be viewed in “Turns Ratio Results”. 75 00:04:13,073 --> 00:04:20,893 “Icalc” is the secondary current calculated by the software in accordance with the turns ratio entered in “Test Object” and the “Itest”. 76 00:04:20,917 --> 00:04:29,242 “Iactual” is the actual value of the injected current, “Imeas” is the measured current and “Turns Ratio Nom” is the “CT” nominal turns ratio. 77 00:04:29,266 --> 00:04:43,470 “Turns Ratio Act” is measured by comparing “Imeas” and “Iactual” and finally, the assessment is recorded in “Assessment” field in accordance with the difference between “Turns Ratio Act” and “Turns Ratio Nom”; if “Deviation act.” 78 00:04:43,494 --> 00:04:49,318 is less than the value specified in the standard, the test “Passes” otherwise it fails. 79 00:04:49,428 --> 00:04:56,211 Here, since the fault percentage is less than the value specified in the standard, the test is “Passed”. 80 00:04:56,449 --> 00:05:05,060 In “Phase” section, In “Phase Nom” and “Phase Act” the nominal phase deviation and the measured phase deviation are specified respectively. 81 00:05:05,084 --> 00:05:14,662 In “Phase Dev”, by comparing “Phase act” and “Phase nom”, the error in terms of minutes is calculated and the assessment is specified in “Assessment” field. 82 00:05:14,686 --> 00:05:19,795 In “Polarity” section, “Pol.Check” field assesses the validity of the polarity. 83 00:05:19,819 --> 00:05:28,194 And in the end, after the test is performed, it is necessary to add the results of the assessment to the report which is done by selecting “Add to Report”. 84 00:05:28,218 --> 00:05:35,163 If to perform the test in higher currents or to have more valid results, you wish to perform the test “Manually”, 85 00:05:35,695 --> 00:05:41,614 you should set “Choose Measurement Mode” at “Manual” mode and according to the picture, use an ammeter. 86 00:05:41,638 --> 00:05:48,795 After checking “Manual”, “Imeas” is editable and you can manually change its number. By entering this value, 87 00:05:49,048 --> 00:05:52,337 the software calculates the error and displays it. 88 00:05:52,361 --> 00:05:57,438 Note that in “Manual” mode it is only possible to perform the turns ratio test. 89 00:05:57,462 --> 00:06:05,350 After selecting “Manual” mode, connect the connectors of the “CT” to the ammeter and set the test time at “5” seconds. 90 00:06:05,374 --> 00:06:23,592 Then press “Init Test” to perform the test. After the test is finished,enter the number read by the ammeter in “Imeas” field so that the device can assess the test based on this value. 91 00:06:23,616 --> 00:06:31,357 In the end, after the test is finished, if you need to add the test results to the report, you can do that by selecting “Add to Report”. 92 00:06:31,944 --> 00:06:45,044 Two notable points are that first, “Error Other” means that there is a problem in the connections or the route resistance is too high that the device is not able to provide the “Burden” need for current. 93 00:06:45,337 --> 00:06:51,796 Therefore, if you faced this error you should check the “Actual” value from “Signal View”. 94 00:06:51,820 --> 00:06:57,211 If the current is injected (“Actual Current”) but its difference with the specified current is too much, 95 00:06:57,235 --> 00:07:04,775 this means that the resistance is too high and if the “Actual Current” is zero, it means that the current injection route is open. 96 00:07:04,799 --> 00:07:15,189 If the route resistance is too high, the test current should be decreased or using several parallel routes and if the “Actual Current” is zero, the connections should be examined. 97 00:07:15,213 --> 00:07:20,546 The next point is that the current read by the device needs to have similar cycles. 98 00:07:20,570 --> 00:07:27,370 If the read values have too high tolerances or the tolerance is zero, it means that the connectors are not connected correctly.