367B. Testing of 7SA610 With F6150-DistPro

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Knowledge Is Power SM DATE 1/01/2006

Apparatus Maintenance and Power Management For Energy Delivery

DOBLE ENGINEERING PVT LTD, 305-SAKAR, OLD PADRA ROAD, VADODARA-390 015 DOBLE ENGINEERING COMPANY, 85-WALNET STREET, WATERTOWN, USA

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Testing of 7SA610 relay with F6150 Kamin Dave (Relay Application Engineer)

DOBLE ENGINEERING PVT LTD

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Introduction Relay:

Zones limit The nominal shape of the 7SA610 characteristic curve is shown in the following image.

7SA610 characteristic curve It is a characteristic polygonal curve with the following features: Directional-1: - 45°; Directional-2: 135°;

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Settings are: - Values X1, X2, X3,X1B or X1L; - Values R1, R2, R3, R1B or R1L for multiphase faults - Values R1E, R2E, R3E, R1BE, R1LE, for single phase faults. .Trip time 1ph: T1,T2, T3; for trip time with mono phase faults. .Trip time >1ph: T1,T2, T3; for trip time with multi phase faults. According to the setting, the dedicated subroutine: Calculates the equations of the lines that define the nominal curve; Calculates the intersections between these lines and the corresponding angles; Given a line, that passes through the axis origin and is inclined of a certain angle referred to the R axis, calculates the intersections with the characteristic curve in terms of resistance and reactance: these are the nominal values that the test subroutine must compute. Relay Settings: R1 = 1.363 Ohms R1E = 10.613 Ohms X1 = 0.569 Ohms R2 = 1.468 Ohms R2E = 10.72 Ohms X2 = 1.09088 Ohms R3 = 1.8 Ohms R3E = 11.05 Ohms X3 = 2.764 Ohms Line Angle = 78 degree Inclination Angle = 78 degree RE/RL = 0.77 XE/XL = 3.01

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TEST CIRCUIT OF 7SA610 relay

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Before the distance relay test start, output voltage and current are zero. When the program is started, three healthy voltages are applied for a second. After this, the program begins with the test of the general start (if requested); then the faults simulation begins to check the zone limits. Faults are generated as follows. Phase to ground fault: on the selected phase (AN, BN, CN) the voltage decreases while the current becomes the fault current; the voltages of the other two phases are modified. Two-phase fault on the pairs AB, BC, CA. With this selection: The amplitude and the angle of the voltages will be automatically modified to simulate a two-phase fault without ground. The two currents (IA & IB) are equal in module but opposite in phase. Three-phase fault: The three voltages have the same module, and also the three currents. After the relay tripping, the fault lasts for a programmable time (corresponding to the breaker opening delay) before returning to healthy conditions. Before starting with a new fault, healthy values are kept for a programmable time, to allow the reset of the relay under test.

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How to Export the relay settings for Test from DIGSI software?

Double click on “Setting Group A”

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Now, Open address “0013”

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It shows the zone settings like Zone Z1/Z2/Z3/Z4/Z5.

Now, Zone Z1 settings are; 1301 = Forward 1302---- R1 = 1.363 Ohms 1303---- X1 = 0.569 Ohms 1304---- R1E = 10.619 Ohms 1305---- T1 = 0 seconds

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Zone Z2

Now, Zone Z2 settings are; 1311 = Forward 1312---- R2 = 1.468 Ohms 1313---- X2 = 1.099 Ohms 1314---- R2E = 10.720 Ohms 1315---- T2 for SLG = 0.3 seconds 1316---- T2 for LL & L-L-L = 0.3 seconds

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Now, Zone Z3 settings are; 1321 = Forward 1322---- R3 = 1.8 Ohms 1323---- X3 = 2.764 Ohms 1324---- R3E = 11.05 Ohms 1325---- T3 for SLG = 1.0 seconds

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Press on “Graph” button

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It shows graph for zones

Z1, Z2, Z3 are for LL & L-L-L faults Z1E, Z2E & Z3E are for SLG fault

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Press on “Export” button to export RIO file

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Save file as a “RIO” file in “C” drive

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Now, open the F6TEST software

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Select database

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Create new relay (Ctrl + A) or double click on existing DB

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Click on “Relay parameters” Tab

Press “Import” button to import RIO file

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Open existing RIO file

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Rename file as “K_T_1”.

Press “Apply” button

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How to open RIO file in F6TEST?

This is the “K_T_1” file & press “show” button

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It shows zone settings

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Compensation settings are automatically imported

RE/RL & XE/XL

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Click on “TestPlan”

Now, Open test plan

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Module type: Z-Char Open Z-char module for characteristic test

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Open “Test Elements” Tab Select setting file “K_T_1”

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Open “Test Configuration” Tab “Test method” Tab

Select “Test Method type” (Constant I, Constant V & Constant Z)

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Open “Test Timing & Trigger selection” Select “time option” (Cycles, Milliseconds, Seconds)

Select Trigger type: AB, BC & CA

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Click on “Test Lines” Tab

Select option: “Radial Lines” Enter the boundary (say 0 – 20 degree insteps of 10 degrees)

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Click on “Test” Tab. Select “AB” fault

Select fault type: AB, BC & CA Phasor shows; magnitude & angle of fault voltage & current

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Results (BC-Fault):

Blue line shows “Expected boundary” & Green points shows actual operating boundary

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Results (CA-Fault):

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Now, select “Ph-N” fault in “Test Elements” Tab

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Test Method: Constant Current

Select “separate arc resistance” options

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Fault type: AN, BN, CN & TRIGGER: Open to Close

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Test Lines for Fault Type: Ph-N Test Lines Method: Radial Lines

Enter Angle Boundary & delta steps

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Click on “Test” Tab

Fault type: AN Results

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Results: BN-Fault

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Results: CN-Fault

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Time Test:

Module Type: Z-TIME Double click on “Time test”

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Fault type: “Ph-Ph” in “Test Elements” Tab

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Test Method: Constant Current

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Fault type: AB, BC, CA TRIGGER NAME TRIGGER CONDITION: Open to Close

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Click on “Add boundary Test Points” button

Z Angle %Zone “Expected Time” for zone operation

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Results (AB-Fault): Graph shows in “R-X” Plane

%Zone = 94.9% to 105% It should be operated on 94.9% & not operated on 105%

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Results (AB-Fault):

Graph shows in “Z-T” Plane

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DOBLE ENGINEERING PVT LTD 305-SAKAR, OLD PADRA ROAD

VADODARA-390 015, INDIA PH: +91 265 655 77 15 Cell: +91 94267 47545

Email: kdave@doble.com Website: www.doble.com

367B. Testing of 7SA610 With F6150-DistPro

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