SynchronizerELIN SYN3000 Digital Synchronizing Relay

Practical Example of Use

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Manual Version: Expl_Syn3000.ENU.1 - Year 2013

© OMICRON electronics. All rights reserved.

This manual is a publication of OMICRON electronics GmbH.

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Reprinting, wholly or in part, is not permitted. The product information, specifications, and technical data embodied in this manual represent the technical status at the time of writing and are subject to change without prior notice.

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1 Synchronizer

Synchronizing relays are used to assist:

• connecting a generator to the network or power grid

• reestablishing the connection between two parts of the network

• manually closing of breakers and

• performing a synchronism check.

Synchronizing relays are designed to measure two voltages with respect to phase angle, frequency, and magnitude to safeguard against the interconnection of two unsynchronized systems.

Figure 1-1:Typical tests for a synchronizing relay

Synchronizing relays are also used in switching operations to link two parts of a system which are already synchronously connected via other paths in the system.

CLOSE ENABLE

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1.1 Application: Connecting a Generator to the Grid

When connecting a generator to the network, the synchronizing relay has to control starting up the generator and switching it onto the network at the right point in time.

The relay commonly used for this duty gives a three-fold check:

1. phase angle difference,

2. voltage difference and

3. frequency difference.

The relay sends a close signal to the breaker when all of the values fall within the set limits and maintain these values for a user-defined period of time. If any of the conditions are not met, some synchronizing relays use adjustment commands which are sent to the valve actuators of the generators in an attempt to achieve the proper conditions. In other cases where the conditions are not met, the relay provides a fault signal.

1.2 Example: ELIN SYN3000 Digital Synchronizing Relay

Sample files:

• SYN3000_function.snc

• SYN3000_adjustment.snc

• SYN3000-CMC256.ohc

• SYN3000.rio

Stored at: ...OMICRON Test Universe installation path\Test Library\Samples\SW Manual Examples\Advanced Protection

Figure 1-2 shows a simple wiring diagram of how the ELIN SYN3000 Digital Synchronizing relay might be employed to connect a generator to the power grid. In this particular example, only one phase of the network power grid is used as the reference. The reference phase is compared to a phase of the generator.

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Figure 1-2:Example of connecting a generator to the power grid

The SYN3000 relay for this example is running in the mode for Generator to Bus Bar or Power Line.

Table 1-1:SYN3000 Relay Settings

Relay Settings

SYS1: Maximum Synchronization V1max = 110 V

SYS1: Minimum Synchronization V1min = 90 V

Max. Diff. Volt inductive +dVmax = 6 V

Max. Diff. Volt capacitive -dVmax = 5 V

Max. Diff. Frequency High +dfmax = 0.25 Hz

Max. Diff. Frequency Low -dfmax = 0.25 Hz

Max. Permissible Phase Angle PHImax = 3°

CB Dead Time Compensation tCB-comp = 100 ms

Voltage adaption kv2 = 200 ms

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1.2.1 Emulation with CMC Test SetIn order to test the SYN3000 relay, the CMC test equipment needs to emulate the environment where the relay is used. We will employ a CMC 256, although a CMC 156 would also be sufficient.

Figure 1-3:Simulation of connecting a generator to the power grid using the CMC 256

• One of the three CMC 256 voltage outputs represents the voltage phase of the network power grid, a second one the voltage phase of the generator.

• Binary Output 1 is used for the SEL1 (Start and Release) control signal of the relay, telling it when to attempt synchronization and when to stop.

• Four of the CMC 256 binary inputs (inputs 1-4) monitor the adjustment control signals from the relay to the generator for increasing/decreasing the voltage or frequency of the generator.

• A fifth CMC 256 binary input (input 5) monitors the circuit breaker (CB) close command from the relay.

• The CMC 256 also provides an Auxiliary DC voltage which can be used to power the relay.

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Note: Figure 1-3 does not show the computer or laptop that is connected to the CMC 256 and runs the Synchronizer test module. Make sure that this is also attached to the CMC 256 while wiring the relay.

1.2.2 Starting Synchronizer

Start Synchronizer in stand-alone mode from the OMICRON Start Page by clicking S Y N C H R O N I Z E R .

1.2.3 Setting up the Test Object

For configuration of your relay under test, the correspondingly named software function Test Object is used. Open Test Object with the pull-down menu item P A R A M E T E R S | T E S T O B J E C T. Alternatively, click the Test Object icon in the toolbar. In Test Object browse, access and edit the test object parameters.

A detailed description of Test Object and the closely related subject "XRIO" can be found in section 3 ”Setting up the Test Object” of the "Concept" manual, or in the online help under the --- Test Object --- entry of the table of contents.

1. Enter the device settings for the ELIN SYN3000 relay as shown in table 1-2.

Table 1-2:Test object device settings for the SYN3000

2. Enter the system parameters for the ELIN SYN3000 relay as shown in figure 1-4 and table 1-3. Figure 1-4 shows the standard page for the system parameters.

Device Settings

Name SYN3000

Manufacturer VA TECH ELIN

Device type Digital Synchronizer

Serial/model number 920212

Number of phases: 3

f nom 50 Hz

V nom 100 V (L-L)

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Figure 1-4:Standard page for the system parameters in the test object parameters dialog

Table 1-3:Data for the test object system parameters

3. Enter the parameters for the synchronizing window for the ELIN SYN3000 relay as shown in figure 1-5 and table 1-4. Figure 1-5 shows the standard page for the synchronizing window.

Synchronizing Parameters

System 1

Rotation sense A-B-C

Connected voltages A-B

System 2

Rotation sense A-B-C

Connected voltages A-B

Settings

CB Closing Time (from Test Object block "CB Configuration")

100.0 ms

Transformer group Phase shift 0.00°

Start/Release Continuous

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Figure 1-5:Standard page for the synchronizing window in the test object parameters dialog

Table 1-4:Data for the test object synchronizing window

Synchronizing Window

|Δ f max | 30 mHz

Δ V> 6 V

Δ Phi (Δϕ) 3 °

Δ f< -250 mHz

Δ f> 250 mHz

|Δ f min| 30 mHz

Δ V< -5 V

Phi tolerances: Relative 3 %

Absolute 0.6°

f tolerances: Relative 3 %

Absolute 3 mHz

V tolerances: Relative 3 %

Absolute 60 mV

Min Sync Time: Time 1.25 s

Min Sync Time: Tolerance 5 %

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1.2.4 Configuring the Hardware

Configure the hardware according to the wiring described in section 1.2.1 ”Emulation with CMC Test Set”.

A detailed description of the Hardware Configuration can be found in the "Concept" manual’s section 4 ”Setting Up the Test Hardware”, or in the online help under the --- Hardware Configuration --- entry of the table of contents.

1. Click the H A R D W A R E C O N F I G U R A T I O N icon or select P A R A M E T E R S | H A R D W A R E C O N F I G U R A T I O N .

2. In the General tab select the connected CMC test set and set the voltages to "3 x 300 Vrms". The current outputs are "not used".

3. On the Analog Outputs tab (figure 1-6):

• Assign "S1 V L1-L2" for the system 1 A-B phase voltage and "S2 V L1-L2" for the respective system 2 A-B phase voltage.

• The connection terminal on the relay can be specified in the third column.

• Assign the crosses in the column for "S1 V L1-L2" and "S2 V L1-L2" to specify which outputs of the CMC 256 are connected to which terminal of the relay.

Figure 1-6:Analog Outputs tab of hardware configuration

4. On the Binary / Analog Inputs tab (figure 1-7):

• Define the displayed names for the voltage signals. Assign "V<", "V>", "f<", "f>", and "Close Cmd" for the signals coming from the relay.

• The connection terminal on the relay can be specified in the third column.

• Assign the crosses in the column for "V<", "V>", "f<", "f>", and "Close Cmd" to specify which outputs of the CMC 256 are connected to which terminals of the relay.

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Figure 1-7:Binary / Analog Inputs tab of the hardware configuration

5. On the Binary Outputs tab (figure 1-8) configure output 1 for the SEL1 control signal of the relay.

Figure 1-8:Binary Outputs tab of the hardware configuration

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1.2.5 Verifying the Wiring Between the Relay and the CMC

At this point in time, it is prudent to check the physical wiring one more time to make sure that it corresponds to section 1.2.1 ”Emulation with CMC Test Set” on page 6. In any event, the physical wiring should be in agreement with the hardware configuration.

1. Verify that the voltage inputs of the relay are connected to the corresponding voltage outputs of the CMC according to our configuration shown in 1-6. Ensure that the voltage "inputs" of the relay are properly grounded according to their configuration.

2. Verify that the binary control signals of the relay are connected to the appropriate binary inputs of the CMC according to our configuration shown in 1-7.

3. Verify that the start signal of the relay is connected to the appropriate binary output of the CMC according to our configuration shown in 1-8.

1.2.6 Defining the Synchronizer Time Settings

1. Select the Settings tab in the Synchronizer Test View.

Figure 1-9:Settings tab for Synchronizer

2. Enter appropriate values for the SYN3000 relay for the pre-synchronization time, the post-synchronization time, the maximum synchronization time, and the delay time between test points.

The minimum post-synchronization time is defaulted to the CB closing time, which was configured as part of the test object.

Table 1-5:Time settings Time Parameters

Pre-sync 1.000 s

Post-sync 100.0 ms

Max-sync 60.00 s

Delay 200.0 ms

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The values entered in the Settings tab determine how long it will take to test a single test point. If synchronization is achieved between the two systems, the total test time for a test point is:

Synchronized: Delay time (if not the first test point)

+ the pre-synchronization time

+ the synchronization time

+ the post-synchronization time

= total test time

During a test when synchronization is achieved, the synchronization time will be less than the maximum synchronization time. The minimum post-synchronization time should be equal to or larger than the CB closing time. The CMC does not output any voltages during the delay time.

If synchronization is not achieved, the total test time for a test point is:

Not Synchronized: Delay time (if not the first test point)

+ the pre-synchronization time

+ the max-synchronization time

= total test time

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1.2.7 The Function Test

The intent of the Function tab is to exercise the circuit breaker (CB) closing functionality of synchronizing relays. You can use individual test points or a table of test points.

Depending on the synchronization conditions defined in the test object and the values of a test point, the Synchronizer test module calculates the expected behavior (nominal response) of the synchronizing relay for this specific test point. If the measured behavior of the relay meets the expected nominal response, the test point is assessed as "passed". If it does not meet this nominal response, the test point is assessed as "failed".

The test points are output by the CMC test set for specific periods of time. The output times are specified in the Settings tab.

The synchronization conditions are defined in the Synchronizing Window tab of the test object (P A R A M E T E R S | T E S T O B J E C T, "Synchronizer" block) as a voltage versus frequency test area, the so-called "synchronizing window". When a test point lies inside of this window, Synchronizer expects the CB close command of the relay to occur within the maximum synchronization time. When a test point lies outside of this window, Synchronizer expects the CB close command not to occur during the maximum synchronization time. For a detailed description, please refer to "Calculation of the nominal response in the Function tab" in the Test Universe Online Help for Synchronizer.

Some synchronizing relays only release the CB close command if the synchronization conditions are met for a certain time. This minimum synchronization time can be defined in the Synchronizing Window tab of the test object. If a minimum synchronization time has been defined, this is also considered for the calculation of the expected nominal response of the relay. For a detailed description, please refer to "Calculation of the nominal response in the Function tab" in the Test Universe Online Help for Synchronizer.

If the time to reach synchronization is very long:

If Δf of a test point is 0 and ΔPhi is 180°, the time required to reach synchronization (i.e. to reduce ΔPhi) is infinite. Consequently, it is impossible to reach synchronization during the maximum synchronization time. If Δf is very small and ΔPhi is very high (towards 180°), the time required to reach synchronization depends on the actual values of Δf and ΔPhi. In this case it is as well necessary to consider the Δf and ΔPhi tolerances set in the test object. For a detailed description, please refer to "Calculation of the nominal response in the Function tab" in the Test Universe Online Help for Synchronizer.

There are three primary ways to get test points into the table.

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1. Enter the information into the respective text boxes for ΔV, Δf, ΔPhi (Δϕ), or V, f, Phi (ϕ), or a combination of the two.

• ΔV, Δf, ΔPhi (Δϕ): Represent the difference between the System 1 reference value and the System 2 test point.

• V, f, Phi (ϕ): Represent actual values to be output for the System 2.

• Relative: Means that the test points are stored in the test document as a percentage relative to the synchronizing window.

Once the information for a test point is acceptable, click the A D D button.

2. Position the mouse pointer in the synchronization graph (to the right). Right-click at a point to obtain a context menu. One of the items allows you to add that test point to the test table.

3. <Ctrl> + left-click adds a point to the table immediately.

The test table has a context sensitive menu that is accessible with a right mouse click. An important feature is being able to show or hide columns to help control how much information is displayed to the person testing.

The synchronization graph also has a context sensitive menu that is accessible with a right mouse click. It allows you to select points for the test table, test points directly, and to zoom in the various areas. It can also be used to display grid lines to aid in test point selection.

T E S T A T Displays the voltage and frequency parameters of the selected test points.

A D D T E S T P O I N T The specified point is added to the test table.

Z O O M I N Permits a given area of the dV / df plane to be enlarged for more refined selection of test points.

Z O O M O U T Permits a given area to be viewed in context with neighboring areas of the dV / df plane. This is mostly used to obtain an overview of the dV / df plane.

Z O O M M O D E Changes the mode for zooming.

Z O O M A L L Permits the entire dV / df plane to be viewed. It zooms out on the chart and includes all defined test points.

S H O W G R I D Displays the markings for the dV axis and the df axis of the dV / df plane.

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Step 1: Defining the FunctionTest

1. Select the Function tab in the Synchronizer Test View.

2. Add test points to the test table using the Q U I C K T E S T button.

The Q U I C K T E S T button places test points at the positive and negative tolerance values of the upper and lower ΔV and Δf positions, for a total of eight.

3. Remove the four test points from upper and lower ΔV position (where Δf = 0), because the SYN3000 relay requires a frequency deviation to work properly.

Test points can be removed individually or as a group by highlighting them and clicking the R E M O V E button. Use <Ctrl> + left-click to select multiple test points. All test points for a test can be removed with the R E M O V E A L L button.

4. Add eight other test points on either side of the Δf = 0 boundary. Place some of them within the synchronization window and some outside, as shown in the figures 1-10 and 1-11.

"Relative" checkbox:

If this option is selected, the test points are stored as a percentage relative to the synchronizing window. The checkbox toggles between relative and absolute and applies to each individual test point and not to the whole table.

Figure 1-10:Test points for the Function tab in Synchronizer

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Figure 1-11:Synchronization graph for FunctionTest in Synchronizer

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Step 2: Running the FunctionTest

1. Once an adequate number of test points have been defined, you can run through them in sequence. Select the P L A Y button.

2. The test points are output by the CMC test equipment for specific periods of time as specified in the Settings tab (refer to section 1.2.6).

Figure 1-12:Test points and their assessment in the Function tab after running the test

After outputting the appropriate voltages for a test point, the test point is assessed as either passing (green "+") or failing (red "x"). The assessment is based on the expectations for the test point. Some points are expected to achieve synchronization (Nominal Response: Sync) while some are not (Nominal Response: No Sync).

For example, test points within the synchronizing window should achieve synchronization in the specified period of time if the relay is working properly. Likewise, test points outside of the synchronizing window are expected to exceed the maximum synchronization time without achieving synchronization. If these expectations hold true after outputting the appropriate voltage to the relay, the test point passes.

In addition to the assessment in the test table, test points are assessed as either passing (green "+") or failing (red "x") in the graph. Again, the assessment is based on the expectation.

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Figure 1-13:Test points assessed as passed in the graph of the Function tab

3. Verify that the Synchronoscope is displayed by selecting V I E W | S Y N C H R O N O S C O P E.

4. When you highlight individual test points from the test table, the synchronoscope shows the ΔPhi (Δϕ) at two different points in time: when the CB Close command was issued and when the CB actually closed.

The ΔPhi (Δϕ) refers to the phase angle difference between the reference system and the test system.

In this manner, you obtain a visual image of the phase difference between system 1 and system 2 when the CB close command is issued (blue arrow) and finally executed (red arrow).

Figure 1-14:Synchronoscope for an individual test point

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The reference frequency can be set to either system 1 or system 2 and defaults to system 1. To change the reference system, use the context menu in the synchronoscope (right-click).

When system 1 is the reference and f1>f2 for subsynchronous operation, the arrow for the phase difference rotates clockwise. When system 1 is the reference and f1<f2 for above synchronous operation, the arrow for the phase difference rotates counter-clockwise.

The synchronoscope can be detached from the status bar and placed as a toolbar anywhere on your desktop. To do so, click and hold the left mouse button on the small arrow in the upper left-hand corner of the synchronoscope. While still holding the mouse button down, drag the synchronoscope until it detaches from the borders of Synchronizer and becomes its own toolbar. If you single click the small arrow in the upper left-hand corner, the synchronoscope can be expanded to fill the entire status bar, or contracted back down to a smaller size.

Step 3: Defining the test report

Select P A R A M E T E R S | R E P O R T . A dialog box appears where you can define the scope of the report.

A detailed description about defining test reports can be found in the "Concept" manual’s section 5.2 ”Test Reports”.

Select V I E W | R E P O R T to display the test report.

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1.2.8 The Adjustment Test

The intent of the Adjustment tab is to exercise the actuator commands issued from the synchronizing relay to the generator that control the voltage level and frequency. You can use individual test points or a table of test points.

The Synchronizing Window tab of the test object (P A R A M E T E R S | T E S T O B J E C T , "Synchronizer" block) defines the voltage versus frequency test area and their respective tolerances, the so-called "synchronization window".

When a test point lies outside of the outer tolerance border of this window and the relay is told to start:

1. The relay issues the appropriate commands (V>, V<, f>, f<) to bring the generator (system 2) into synchronization with the reference network (system 1).

2. The Synchronizer test module detects these binary signals and changes the voltage outputs for system 2 based on the defined generator model. The ΔV/t and Δf/t values of the generator model define how the CMC varies the system 2 outputs.

3. The synchronizing relay should issue its control signals until the system 2 output has been brought within the synchronizing window.

4 a) If so, the relay can issue the CB close command and the Synchronizer software enters the post-synchronization mode.

b) If no CB close command is received within the maximum synchronization time, the Synchronizer software issues the Release command.

5. The Synchronizer test module evaluates the time (t sync) elapsed between the Start command and the CB close command. It is important for the test point pass/fail assessment to know the voltage, frequency, and phase angle:

- when the Start command is issued to the relay,

- when the relay issues the CB close command,

- when the CB actually closes.

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When a test point lies inside of the synchronization window and the relay is told to start:

1. The Synchronizer test module verifies that extraneous commands (V>, V<, f>, f<) are issued.

2 a) Because the test point is within the synchronizing window, the relay can issue the CB close command and the Synchronizer test module enters the post-synchronization mode.

b) If the CB command is not received within the maximum synchronization time, the Synchronizer test module issues the Release command.

3. The Synchronizer test module evaluates the time (t sync) elapsed between the Start command and the CB close command. It is important for the test point pass/fail assessment to know the voltage, frequency, and phase angle:

- when the Start command is issued to the relay.

- when the relay issues the CB close command.

- when the CB actually closes.

The test points are output by the CMC test equipment for specific periods of time. The output times are specified in the Settings tab (refer to section 1.2.6).

In the Signal View you can view the exact behavior of the binary signals for a specific test point.

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Step 1: Defining the Adjustment Test

Note: If you have previously defined a FunctionTest (refer to section 1.2.7) and you want to enable an Adjustment Test, you must

• either delete the test points defined on the Function tab (and, if available, the test results)

• or open a new test (F I L E | N E W) and define the test object parameters and the hardware configuration again (refer to sections 1.2.3 and 1.2.4).

1. Select the Adjustment tab in the Synchronizer Test View.

2. Add test points to the test table. Only four points are going to be defined here to demonstrate this.

Place two of them within the synchronization window near the synchronization window boundaries and two outside, as shown in figure 1-15 and figure 1-16.

The three primary ways to get test points into the table.

• Enter the information into the respective text boxes for ΔV, Δf, ΔPhi (Δϕ), or V, f, Phi (ϕ), or a combination of the two. Once the information for a test point is acceptable, click the A D D button.

• Position the mouse in the synchronization graph (to the right). Right-click at a point to obtain a context menu. One of the items allows you to add that test point to the test table.

• <Ctrl> + left-click adds a point to the table immediately.

Figure 1-15:Adjustment tab with test points

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Figure 1-16:Synchronization graph for the test points

Step 2: Running the Adjustment Test

1. Once an adequate number of test points have been defined, you can run through them in sequence. Select the P L A Y button.

2. The test points are output by the CMC test equipment for specific periods of time. The output times are specified in the Settings tab, refer to section 1.2.6.

Figure 1-17:Test points assessed in the Adjustment tab

In addition to the assessment in the test table, test points are assessed as either passing (green "+") or failing (red "x") in the graph. Again, the assessment is based on the expectation.

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Figure 1-18:Synchronization graph showing the movement of the test points to within the synchronization window

The synchronization graph contains useful graphical information about what happened to the test points. In particular, it shows how the test points were moved before synchronization was achieved.

The test points that were outside of the synchronization window resulted in the relay issuing the appropriate commands to raise or lower the voltage and to increase or decrease the frequency. These commands were interpreted by the Generator Mode of Synchronizer to control the physical output quantities of system 2.

When the synchronizing relay is working properly, the test points are moved into the synchronizing window until synchronization happens.

If synchronization happens within maximum synchronization time, the test point passes. Otherwise, it fails.

When an individual test point is highlighted in the test table, its corresponding starting and ending points are highlighted in the synchronization graph along with the adjustment control migration path.

3. Verify that the Synchronoscope is displayed by selecting V I E W | S Y N C H R O N O S C O P E. Highlight individual test points from the test table so that the synchronoscope shows the ΔPhi (Δϕ) at two different points in time: when the CB Close command was issued and when the CB actually closed.

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Figure 1-19:Synchronoscope for an individual test point

Step 3: Defining the test report

Select P A R A M E T E R S | R E P O R T . A dialog box appears where you can define the scope of the report.

A detailed description about defining test reports can be found in the "Concept" manual’s section 5.2 ”Test Reports”, or in the online help under the --- Test Reports --- entry of the table of contents.

Select V I E W | R E P O R T to display the test report.

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1.2.9 Creating an OCC Test Document

If previously saved, the two test files for the SYN3000 relay (e.g. SYN3000_function.snc and SYN3000_adjustment.snc) can be embedded in a Control Center (OCC) document in order to create an automated test document that performs both the FunctionTest and the Adjustment Test.

To create an OCC document:

1. Start the Control Center either with an empty document or a template.

2. Click the T E S T O B J E C T toolbar icon or select I N S E R T | T E S T O B J E C T to open the dialog for the test object specific data and specify the parameters for your relay under test.

3. Click the H A R D W A R E C O N F I G U R A T I O N toolbar icon or select I N S E R T | H A R D W A R E C O N F I G U R A T I O N to open the dialog for the hardware configuration and specify the hardware configuration as described in section 1.2.4.

4. Select I N S E R T | T E S T M O D U L E. . . to open the dialog for the Synchronizer test objects.

IMPORTANT: Select "Create From File" in this dialog box.

Browse to the directory where the test files (e.g. SYN3000_function.snc and SYN3000_adjustment.snc) are stored and select one of them.

5. S E L E C T I N S E R T | T E S T M O D U L E . . . again. Select "Create From File" in this dialog box. Browse to the directory where the test files (e.g. SYN3000_function.snc and SYN3000_adjustment.snc) are stored and select the other file.

6. At this point, you have a basic, no-frills OCC test document that can run both the FunctionTest and the Adjustment Test. You can provide further customization to this OCC test document.

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