1 00:00:19,923 --> 00:00:25,476 51V function test in SIEMENS 7SD82 relay 2 00:00:25,509 --> 00:00:30,635 The 51V function is capable of detecting short circuit in the power grid. 3 00:00:30,750 --> 00:00:39,166 This function can be used in special network conditions where the overcurrent pickup limit can be changed depending on the fault voltage. 4 00:00:39,205 --> 00:00:47,884 In Siemens 7SD82 relay, this function can be used in function groups with three-phase voltage and current, 5 00:00:47,909 --> 00:00:56,597 and two inverse time stages depending on voltage and constant time with specific undervoltage conditions are considered by default. 6 00:00:57,522 --> 00:01:01,049 In this test, the first stage of both categories is used. 7 00:01:01,074 --> 00:01:10,502 Note that in the "51V" function test, the fault detection or non-detection is done according to the voltage and current level of the test, 8 00:01:11,085 --> 00:01:23,877 which is "Voltage-Controlled" and "Voltage-Restrained", is used as a generator differential protection support and in power systems to coordinate high current relays. 9 00:01:23,902 --> 00:01:29,674 In this test, the characteristic curve is Voltage-Restrained as you can see. 10 00:01:30,193 --> 00:01:41,135 In the V/Vrated range between 0.25 and 1, the diagram is linear, which the pickup current value is directly proportional to the voltage increase. 11 00:01:41,160 --> 00:01:46,979 In this regard, V is the phase-to-phase voltage measured, Vrated, rated voltage, 12 00:01:47,004 --> 00:01:54,283 PU sett setting of pickup threshold and PU(V) pickup threshold applied, according to voltage. 13 00:01:54,497 --> 00:01:59,010 The control voltage for each current phase is according to the table: 14 00:01:59,035 --> 00:02:07,518 The settings in the 7SD82 relay for this protection stage are performed according to the image: 15 00:02:07,543 --> 00:02:12,276 If you want harmonics to be included in the measurements related to this stage, 16 00:02:12,301 --> 00:02:16,801 select RMS Value option in the Method of Measurement section. 17 00:02:16,826 --> 00:02:20,940 Otherwise, in order to skip harmonics and transient conditions, 18 00:02:20,965 --> 00:02:25,213 select Fundamental Com, which is Siemens' suggested option. 19 00:02:25,238 --> 00:02:31,502 The 1.5amp current setting value is also a good option for most applications. 20 00:02:31,527 --> 00:02:42,269 The current threshold parameter for lines is up to 10% and for transformers and engines up to about 20% higher than the maximum of expected load, 21 00:02:42,294 --> 00:02:49,605 adjusted and in the characteristic section, select the curve according to the IEC and ANSI standards. 22 00:02:49,630 --> 00:02:52,730 Here we used the 1amp setting. 23 00:02:52,755 --> 00:03:01,090 to reset parameter, you can also select the instant reset option or reset by modeling the movement of disk relays. 24 00:03:01,115 --> 00:03:06,777 The Time Dial option also allows moving the characteristic in the direction of the time axis. 25 00:03:06,802 --> 00:03:12,465 The next stage with considering the undervoltage function conditions is also set as follow so 26 00:03:12,490 --> 00:03:18,043 that if there are sufficient voltage conditions, we can see the activation of the function. 27 00:03:18,068 --> 00:03:26,410 After applying the settings on the relay and specifying the required contacts in the configuration section, it is time to test the function. 28 00:03:26,435 --> 00:03:29,277 Keep in mind that due to curve performance, 29 00:03:29,302 --> 00:03:37,848 either use the pickup contact or consider the time required in the Max Fault Time section for the 51V function performance. 30 00:03:38,513 --> 00:03:45,755 In the AMT VIStarting room, to test the relay, you must first enter its information in the "Test Object" window. 31 00:03:45,780 --> 00:03:55,702 In the "Device" block, information such as the relay's name, serial number, relay operation location, "CT" and "PT" specifications are entered. 32 00:03:55,727 --> 00:04:02,746 Also, to enter the settings of this function, you need to double-click on the "VI Starting" block from the tree chart, 33 00:04:02,780 --> 00:04:11,038 and in the "VI Starting Parameters" page, enter the settings needed to display in the "VI Starting Characteristic" characteristic curve. 34 00:04:11,063 --> 00:04:17,686 In the Tolerances section, you can also enter the percentage of acceptable fault to perform the test. 35 00:04:17,711 --> 00:04:23,740 By confirming the entered settings, it is time to perform Shot Test, Check Test and Search Test. 36 00:04:23,765 --> 00:04:32,194 in the "Shot Test" tab you select the type of fault and points to test and after the test is perform, you can see the evaluation results. 37 00:04:32,219 --> 00:04:41,366 In "Check Test", the upper and lower tolerances of the relay displayed as dashes in "VI Starting Characteristic" are tested and evaluated. 38 00:04:41,391 --> 00:04:48,749 Note that the plotted "Check Line" should have cross at least one of the tolerance lines of the characteristic curve. 39 00:04:49,090 --> 00:04:54,350 Search Test is the last test performed on the "VI Starting" characteristic curve. 40 00:04:54,375 --> 00:04:58,257 The purpose of this test is to find the characteristic curve line. 41 00:04:58,282 --> 00:05:01,757 The "Search Line" method is the same as "Check Line". 42 00:05:01,782 --> 00:05:12,122 By performing the test, the software by testing several points on the search line to the characteristic curve interpolation and determine the exact location of the characteristic curve. 43 00:05:12,147 --> 00:05:14,936 Keep in mind that due to the required voltage level, 44 00:05:14,968 --> 00:05:19,303 by referring to the test object Parameters and then the Device block. 45 00:05:19,328 --> 00:05:23,149 you may need to increase the final voltage limit or V max 46 00:06:41,848 --> 00:06:44,569 When the test ends and saves the file, 47 00:06:44,594 --> 00:06:54,397 simply select parameters to open the report setting window to get the result as an output file by selecting the parameters that need to be entered in the final report.