Schweitzer 351 Relay
Test 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, a
library of relays and tests developed is displayed. In the right hand side of the screen, a
snapshot of a real test of Phase Time Overcurrent Test feature of a SEL 351 relay is
provided. The test unit current generator value and timer unit required by the test are
displayed and update real time during the test. Any other variable can be displayed in the
upper part of the screen provided that it was previously designed in the Monitor Editor
screen. Once the relay trips, the software plots the actual value of the time for each
current multiplier tested (blue dots). The user can see the graphic representation of the
time elapsed from the inception of the test sequence as a vector (red color) moving step
by step towards the expected value of the time (red color line). The error is calculated and
displayed instantly in the log right above the graphic screen along with some other useful
data (Actual Time, Expected Time, Current Multiplier, Minimum Range and Maximum
Range of the Time, Pass/Fail message, etc.).
Phase Time Overcurrent Test
A picture of the Test Editor is shown above. The icons represent macro functions
helping the user to perform specific tasks in order to accomplish automatic testing of a
relay. The icons, links and text editor can be selected using the controls in the right hand
side of the editor screen. The user can easily develop a test plan using a proper
combination of the controls.
Phase Time Overcurrent Test
The Connection Editor screen allows the user to see the connection diagram between
the test unit and the relay. The user can easily draw any diagram using the controls shown
on the right hand side of the Test Editor Screen . Any bitmap file containing the internal
diagram of a specific relay can be pasted here.
Phase Time Overcurrent Test
The General Information screen is the place where the user can find valuable
information in order to run the test. For example, here is the place where the user is told
what assignment to provide to what output contact of a digital relay in order to perform a
specific test. Also any text document related to the testing procedure can be pasted here
for reference.
Frequency Timing Test
AVTS is based on the concept of total visualization. In the left hand side of the screen, a
library of relays and tests developed is displayed. In the right hand side of the screen, a
snapshot 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 was
previously designed in the Monitor Editor screen. Once the relay trips, the error is
calculated and displayed instantly in the log along with some other useful data (Actual
Time, 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 functions
helping the user to perform specific tasks in order to accomplish automatic testing of a
relay. The icons, links and text editor can be selected using the controls in the right hand
side of the editor screen. The user can easily develop a test plan using a proper
combination of the controls.
Frequency Timing Test
The Connection Editor screen allows the user to see the connection diagram between
the test unit and the relay. The user can easily draw any diagram using the controls shown
on the right hand side of the Test Editor Screen . Any bitmap file containing the internal
diagram of a specific relay can be pasted here.
Frequency Timing Test
The General Information screen is the place where the user can find valuable
information in order to run the test. For example, here is the place where the user is told
what assignment to provide to what output contact of a digital relay in order to perform a
specific test. Any text document related to the testing procedure can be pasted here for
reference also.
Negative Sequence Impedance Reverse Reach
AVTS is based on the concept of total visualization. In the left hand side of the screen, a
library of relays and tests developed is displayed. In the right hand side of the screen, a
snapshot of a real test of Negative Sequence Impedance Reverse Reach feature of a
SEL 351 relay is provided. All the test unit current and voltage generators values are
displayed in real time as well as the actual value of the negative sequence fault
impedance. Any other variable can be displayed in the upper part of the screen provided
that it was previously designed in the Monitor Editor screen. The user can see the fault
impedance vector (red color) moving step by step towards the expected value of the
impedance (green color). Once the relay trips, the software plots the actual value of the
impedance on the diagram (blue dot). The error is calculated and displayed instantly 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 Reverse Reach
The General Information screen is the place where the user can find valuable
information in order to run the test. For example, here is the place where the user is told
what assignment to provide to what output contact of a digital relay in order to perform a
specific test. Any text document related to the testing procedure can be pasted here for
reference also.
Negative Sequence Impedance Forward Reach
AVTS is based on the concept of total visualization. In the left hand side of the screen, a
library of relays and tests developed is displayed. In the right hand side of the screen, a
snapshot of a real test of Negative Sequence Impedance Forward Reach feature of a
SEL 351 relay is provided. All the test unit current and voltage generators values are
displayed in real time as well as the actual value of the negative sequence fault
impedance. Any other variable can be displayed in the upper part of the screen provided
that it was previously designed in the Monitor Editor screen. The user can see the fault
impedance vector (red color) moving step by step towards the expected value of the
impedance (brown color). The Negative Sequence Impedance Reverse Characteristic is
overlayed for reference (green color). Once the relay trips, the software plots the actual
value of the impedance on the diagram (blue dot). The error is calculated and displayed
instantly 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 valuable
information in order to run the test. For example, here is the place where the user is told
what assignment to provide to what output contact of a digital relay in order to perform a
specific test. Any text document related to the testing procedure can be pasted here for
reference also.