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Negative sequence overcurrent protection test in AMR relay (simple test using templates)

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AMR modular relay of Vebko company supports various protection functions.

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Explanations of the capabilities and software environment of this relay have alread

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been presented in the video related to differential protection test.

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After connecting to the AMR relay at first,

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simply load the device's hardware configuration from the Device menu by selecting the Read Hardware from Relay option.

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The default password is 123456 to receive elements.

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At this point, a message is given to remove the signal, which if confirmed,

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if the current hardware is not the same as the relay hardware,

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the current hardware signals used in the VFC section are deleted.

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It should be noted that the settings for the conversion ratio of voltage and current

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transformers are determined in the related card.

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Here, current card conversion ratio is 200A to 1A and voltage card conversion ratio is 63,000 to 100V.

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(First, enter the VFC page): As mentioned earlier in the AMR software,

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configuring some of the most widely used functions are placed in the software as samples

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the user can send new settings to the relay by selecting each of them and applying the desired changes.

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For this purpose, a set of functions can be seen in the Relay VFC tab and in the Temp Functions section.

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It should be noted that by selecting each Temp Function, the blocks in the VFC are removed.

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Here the negative sequence overcurrent function displayed with the name NS 46 is selected.

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In this template, first, the signals of a current card are given to the Current Quantities block to create different current sequences in its output.

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In the default config of the Negative Sequence function,

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a block with different stages and signals of a current card with negative sequence is assigned to its input.

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Finally, output signals are assigned to Binary Outputs and relay LEDs by Output and LED blocks.

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To change the settings, simply right-click on each block to access a set of options.

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By double-clicking on the Negative Sequence block, the settings for its various stages are visible.

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Here, the first stage with normal Inverse setting characteristic has a current of 0.1 amps,

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the TMS equals 1, and the two constant time stages with a current setting of 0.2 and 0.5A have a time setting of 1.5 and 0.5 seconds, respectively.

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By making these changes, simply select Send Config and Setting to Relay from the Device menu again.

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This way, the settings and applied configuration are moved to the relay. (Cut from this part until the overcurrent room opens).

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In the next step, by running AMPro software and opening the AMT Overcurrent room,

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it is enough to go to the Test Object Parameters section and create the test characteristic after entering the information.

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The test characteristic is created in the Elements tab in the Negative Sequence section.

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Therefore, the default characteristic in this section is removed first.

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First, a reverse time characteristic is created with a current setting of 0.1 amps and TMS=1.

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The next characteristic is created by current setting of 0.2 and a time of 1.5 seconds.

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Finally, the third characteristic is created by adjusting the current setting of 0.5 and the time of 0.5 seconds.

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Keep in mind that it is also possible to test this function using the Xrio file.

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In order to evaluate the performance of negative sequence overcurrent function,

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two Trip Time and Pickup-Drop Off tests are performed.

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The purpose of Trip Time is to detect and evaluate the accuracy of the performance

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time of this function and the purpose of pickup-drop off test is to detect and evaluate the accuracy

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of the actual current of the performance threshold and the reset threshold of this function.

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Trip Test

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To perform this test three states ones including PreFault, Fault and PostFault are required.

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PreFault time is suitable for 500 milliseconds, fault time should be greater than the maximum trip time,

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and Post Fault time is at least 500 milliseconds.

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PostFault time should be increased if the drop-off is not instantaneous.

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The suggested points for reduced time functions are 1.5 times,

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2 times and 4 times the regulatory current, and for constant time curves, 1.5 and 2 times the regulatory current.

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These points are added to the fault type 12 to prepare the test.

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Keep in mind that due to the existence of three different characteristic, in some cases,

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the added points with the mentioned coefficients fall on the other characteristic.

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In these cases, other points are manually added on each characteristicto ensure accurate time performance.

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To detect the regulatory current of the second and third units,

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two points can be added to 90 and 110 percent of the regulatory current of these units in order to perform a kind of pickup drop-off test for these characteristics.

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Once again, the Max Fault Time value is set based on the highest number inserted in the t nom section.

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By adding points, perform the test to check the performance of this function from the point of view of time accuracy.

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Pickup/Drop-off Test

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In order to perform this test, it is first to determine how the diagnosis of pickup and drop-off is performed.

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This process can be done through a separate contact, like Start,

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Relay LED viewing, or changing the setting for the instantaneous of the function and using the trip contact.

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Here we used the relay pickup contact.

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You can also put the current fault value in the desired range.

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Here the fault value is considered 5% by default.

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The performance range of overcurrent curves in the AMR relay starts from 1.1 regulatory current in the relay.

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Therefore, first, by enabling the Active Range Limits option in the Overcurrent Protection Parameters window,

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Imin value are determined to be 1.1*0.1=0.11 Iref. In the next step,

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the current adjustment value for the pickup is placed on 0.1*1.1=0.11 amps.

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By adding this point, it is enough to perform the test and add the necessary elements to the report when it is finished.