Schweitzer 351 RelayTest Module Samples(Select a test sample below to view details)

• Phase Time Overcurrent Test (3 phase fault)

• Frequency Timing Test

• Negative Sequence Impedance Reverse Reach Test (3 phase test)

• Negative Sequence Impedance Forward Reach Test (3 phase test)

Phase Time Overcurrent Test

AVTS is based on the concept of total visualization. In the left hand side of the screen, alibrary of relays and tests developed is displayed. In the right hand side of the screen, asnapshot of a real test of Phase Time Overcurrent Test feature of a SEL 351 relay isprovided. The test unit current generator value and timer unit required by the test aredisplayed and update real time during the test. Any other variable can be displayed in theupper part of the screen provided that it was previously designed in the Monitor Editorscreen. Once the relay trips, the software plots the actual value of the time for eachcurrent multiplier tested (blue dots). The user can see the graphic representation of thetime elapsed from the inception of the test sequence as a vector (red color) moving stepby step towards the expected value of the time (red color line). The error is calculated anddisplayed instantly in the log right above the graphic screen along with some other usefuldata (Actual Time, Expected Time, Current Multiplier, Minimum Range and MaximumRange of the Time, Pass/Fail message, etc.).

Phase Time Overcurrent Test

A picture of the Test Editor is shown above. The icons represent macro functionshelping the user to perform specific tasks in order to accomplish automatic testing of arelay. The icons, links and text editor can be selected using the controls in the right handside of the editor screen. The user can easily develop a test plan using a propercombination of the controls.

Phase Time Overcurrent Test

The Connection Editor screen allows the user to see the connection diagram betweenthe test unit and the relay. The user can easily draw any diagram using the controls shownon the right hand side of the Test Editor Screen . Any bitmap file containing the internaldiagram of a specific relay can be pasted here.

Phase Time Overcurrent Test

The General Information screen is the place where the user can find valuableinformation in order to run the test. For example, here is the place where the user is toldwhat assignment to provide to what output contact of a digital relay in order to perform aspecific test. Also any text document related to the testing procedure can be pasted herefor reference.

Frequency Timing Test

AVTS is based on the concept of total visualization. In the left hand side of the screen, alibrary of relays and tests developed is displayed. In the right hand side of the screen, asnapshot of a real test of Frequency timing test feature of a SEL 351 relay is provided.The test unit voltage generators values required for the test are displayed in real time.Any other variable can be displayed in the upper part of the screen provided that it waspreviously designed in the Monitor Editor screen. Once the relay trips, the error iscalculated and displayed instantly in the log along with some other useful data (ActualTime, Expected Time, Minimum Time, Maximum Time, Pass/Fail message, etc.).

Frequency Timing Test

A picture of the Test Editor is shown above. The icons represent macro functionshelping the user to perform specific tasks in order to accomplish automatic testing of arelay. The icons, links and text editor can be selected using the controls in the right handside of the editor screen. The user can easily develop a test plan using a propercombination of the controls.

Frequency Timing Test

The Connection Editor screen allows the user to see the connection diagram betweenthe test unit and the relay. The user can easily draw any diagram using the controls shownon the right hand side of the Test Editor Screen . Any bitmap file containing the internaldiagram of a specific relay can be pasted here.

Frequency Timing Test

The General Information screen is the place where the user can find valuableinformation in order to run the test. For example, here is the place where the user is toldwhat assignment to provide to what output contact of a digital relay in order to perform aspecific test. Any text document related to the testing procedure can be pasted here forreference also.

Negative Sequence Impedance Reverse Reach

AVTS is based on the concept of total visualization. In the left hand side of the screen, alibrary of relays and tests developed is displayed. In the right hand side of the screen, asnapshot of a real test of Negative Sequence Impedance Reverse Reach feature of aSEL 351 relay is provided. All the test unit current and voltage generators values aredisplayed in real time as well as the actual value of the negative sequence faultimpedance. Any other variable can be displayed in the upper part of the screen providedthat it was previously designed in the Monitor Editor screen. The user can see the faultimpedance vector (red color) moving step by step towards the expected value of theimpedance (green color). Once the relay trips, the software plots the actual value of theimpedance on the diagram (blue dot). The error is calculated and displayed instantly inthe log right above the graphic screen along with some other useful data (ActualImpedance, Expected Impedance, Test Current, Test Voltage, Pass/Fail message, etc.).

Negative Sequence Impedance Reverse Reach

The General Information screen is the place where the user can find valuableinformation in order to run the test. For example, here is the place where the user is toldwhat assignment to provide to what output contact of a digital relay in order to perform aspecific test. Any text document related to the testing procedure can be pasted here forreference also.

Negative Sequence Impedance Forward Reach

AVTS is based on the concept of total visualization. In the left hand side of the screen, alibrary of relays and tests developed is displayed. In the right hand side of the screen, asnapshot of a real test of Negative Sequence Impedance Forward Reach feature of aSEL 351 relay is provided. All the test unit current and voltage generators values aredisplayed in real time as well as the actual value of the negative sequence faultimpedance. Any other variable can be displayed in the upper part of the screen providedthat it was previously designed in the Monitor Editor screen. The user can see the faultimpedance vector (red color) moving step by step towards the expected value of theimpedance (brown color). The Negative Sequence Impedance Reverse Characteristic isoverlayed for reference (green color). Once the relay trips, the software plots the actualvalue of the impedance on the diagram (blue dot). The error is calculated and displayedinstantly in the log right above the graphic screen along with some other useful data(Actual Impedance, Expected Impedance, Test Current, Test Voltage, Pass/Fail message,etc.).

Negative Sequence Impedance Forward Reach

The General Information screen is the place where the user can find valuableinformation in order to run the test. For example, here is the place where the user is toldwhat assignment to provide to what output contact of a digital relay in order to perform aspecific test. Any text document related to the testing procedure can be pasted here forreference also.