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Synchronizer ELIN SYN3000 Digital Synchronizing Relay Practical Example of Use

OMICRON Test Universe

Manual Version: Expl_Syn3000.ENU.1 - Year 2013 © OMICRON electronics. All rights reserved. This manual is a publication of OMICRON electronics GmbH. All rights including translation reserved. Reproduction of any kind, e.g., photocopying, microfilming, optical character recognition and/or storage in electronic data processing systems, requires the explicit consent of OMICRON electronics. 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. We have done our best to ensure that the information given in this manual is useful, accurate, up-to-date and reliable. However, OMICRON electronics does not assume responsibility for any inaccuracies which may be present. The user is responsible for every application that makes use of an OMICRON product. OMICRON electronics translates this manual from the source language English into a number of other languages. Any translation of this manual is done for local requirements, and in the event of a dispute between the English and a non-English version, the English version of this manual shall govern.

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Synchronizer

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

CLOSE ENABLE

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.

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OMICRON Test Universe

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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Synchronizer

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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OMICRON Test Universe

1.2.1

Emulation with CMC Test Set In 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

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•

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.

Synchronizer

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

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)

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.

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OMICRON Test Universe

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

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

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.

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Synchronizer

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>

6V

Δ Phi (Δϕ)

3°

Δ f


250 mHz

|Δ f min|

30 mHz

Δ V
f2 for subsynchronous operation, the arrow for the phase difference rotates clockwise. When system 1 is the reference and f1, V, f, V, f