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Synchronizer function test in Siprotec siemens 7SD82 relay

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In AMT Synchronizer, we're going to test the synchronous check function in Siemens' 7SD82 relay.

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This function can be used to synchronize the line and busbar, two busbars with coupling or a generator and busbar.

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This function, which is located in circuit breaker function group,

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can be used in different modes such as checking the synchronous of two systems,

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switching synchronous power systems, switching asynchronous power systems and switching the busbar/ line outage.

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For this purpose, different stages can be used in the form of synchronous check Stage

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(with two stages) or Synchronous/Asynchronous Stage (with six stages).

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This function uses two voltages to check the connecting conditions.

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The reference voltage of the first side which is called V1 and the reference voltage of the second side which is V2.

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Choosing voltages to synchronize depends on the system connection on the primary side.

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In this test, a 4-input voltage connection is used, which includes a single-phase voltage and a three-phase combination.

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In this case, the voltage attached to the single-phase Measuring Point is the decisive reference.

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The measured values related to this performance are displayed on the relay as primary, secondary and percentage.

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When the function is activated, the values of Delta V, Delta F and Delta Alpha are checked to connect the synchronous of the two systems.

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The settings on the relay are as follows:

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If we want to differentiate between synchronous and asynchronous conditions,

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we should use synchronous/Asynchronous stage, whose voltage-frequency diagram is as follows:

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By opening the AMT Synchronizer room to enter the relay information for testing,

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the first task is to enter the relay nominal information in "Device".

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In this section, related settings for CT and VT conversion ratio are entered.

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Keep in mind that if there is a different VT conversion ratio between the two systems, should be using a virtual VT,

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according to the manual relay recipe, used a coefficient to match the conversion ratio.

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In the Hardware Configuration section,

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5 Input binaries are defined by default to transfer relay outputs to the test device to adjust the voltage and frequency and issue the connecting command.

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Considering that in this test, alarms about voltage and frequency values are read from the relay

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, we only configure the binary related to the issuance of the command connected by the relay.

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Next, in the Synchronizing Parameters window the relay settings are entered.

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By specifying the phase sequence, connected voltages, breaker connection settings, and secondary voltage in the Protection Device tab,

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it is time to reach the Synchronizing Window tab.

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In this section, the minimum and maximum values for voltage and frequency parameters are entered,

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followed by the allowed tolerances for the Phi, V and f parameters.

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Keep in mind that for this relay, Dead Zone is not defined as an area where no output is exported from the relay.

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When the settings are confirmed, it is time to take the test.

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In this section, system settings 1 and 2 can be seen in the relevant tables.

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In addition to the possibility of manually entering specifications for two systems,

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it is possible to monitor the delta value of voltage, frequency and angle elements.

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In the next step, simply add points to the attribute and run the test.

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It is also possible to create points on either side of the characteristic boundary line using the Quick Test option.

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With the completion of the test, the selected items and elements can be viewed in the Report View window.