Communication-Assisted Transfer Trip Schemes · Communication-Assisted Transfer Trip Schemes The...
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ECE 526: Protection of Power Systems II
Lab 3; Page 1/29Spring 2017
Communication-Assisted Transfer Trip Schemes
The MathCAD sheet below implements some basic relay calculations. The file takes data read from a Comtrade file and postprocesses it.
The matrix "data" below is the data captured from a COMTRADE "*.dat" file. To read in a data file remove the table currentlyat the top of the file. Then choose "Insert" ---> "Component".
This will open a dialog box. One option is to choose "Input Table". * Then select the first cell in the table and right click your mouse and choose "Import". * Then browse to the "*.dat" COMTRADE file and select. This will fill in the data in the table. Then name the variable as "data"
Another option is to choose "File Read or Write".* This will open a dialog box, choose Text file* Browse for file with extension .txt or .csv. * Your assignments will tell you which files to open.
The example below uses the File Read or Write option.
Part 1. Read Comtrade File Data
1. Read Comtrade Configuration File:
config...\EX110AGF1.cfg
Right click on the floppy disk icon and select "Choose File" toopen a file browser. Choose the *.cfg file from the contrade file(you will need to type the extension). MathCAD 13 or higherusers, right click and select properties.
data...\EX110AGF1.dat
Right click on the floppy disk icon and select "Choose File" toopen a file browser. Choose the *.dat file from the contrade file (itshould be an accepted file type)
ECE 526: Protection of Power Systems II
Lab 3; Page 2/29Spring 2017
COMTRADE configuration file format:The first row (row 0) states how the file was created and the version of the standard1.The second row (row 1) gives the total number of inputs (14 for these cases), number of analog inputs (14 here) and number2.of digital inputs (0 here)Rows 2-8 are the analog inputs for relay 1 in this model, in the following order:3.
In (referred to as residual current below)IaIbIcVan at Bus 1VbnVcn
Rows 9-15 are the analog inputs for relay 2 in this model, in the following order:In (referred to as residual current below)IaIbIcVan at Bus 2VbnVcn
4. Data sampled 16 times per cycle (960 Hz)
User Entered Parameters:I am entering typical values the current transformer ration (CTR) and voltage transformer ratio (PTR). You need to change theseto match your calculations.
CTR 1 PTR 1 Same for both relay modelsSampling rate (samples/sec) RS 16
Click on the Arrow to hide/unhide the digital filtering, angle calculations and symmterical components calculations
Now plot the currents and voltages. These should be sinusoidal. Note that the horizontal axis is in the number of cycles since thei/RS is sample number divided by sampling rate.
As a check, the prefault data should be balanced three phase
ECE 526: Protection of Power Systems II
Lab 3; Page 3/29Spring 2017
Relay 1 phase currents and residual current
10 20 3060
40
20
0
20
40
60
IA_r1i
IB_r1i
IC_r1i
IR_r1i
i
RS
0 5 10 15 20200
100
0
100
200
VA_r1i
VB_r1i
VC_r1i
i
RS
0 5 10 150
20
40
60
80
VA0_r1v
VA1_r1v
VA2_r1v
v
RS
0 10 200
2
4
6
8
10
IA0_r1v
IA1_r1v
IA2_r1v
v
RS
ECE 526: Protection of Power Systems II
Lab 3; Page 4/29Spring 2017
0 20 40 600
10
20
30
3 IA0_r1v
IR_r1cpxv
v
RS
Compare 3I0 to measured residual (ground current)
Relay 2 phase currents and residual currentRelay 2 line to ground voltages:
0 10 20 30200
100
0
100
200
VA_r2i
VB_r2i
VC_r2i
i
RS
10 20 3060
40
20
0
20
40
60
IA_r2i
IB_r2i
IC_r2i
IR_r2i
i
RS
ECE 526: Protection of Power Systems II
Lab 3; Page 5/29Spring 2017
Symmetrical Components: phasor with magnitude and phase (we are only uses magnitude for now).
0 5 10 15 20 25 300
10
20
30
IA_r1cpxv
IB_r1cpxv
IC_r1cpxv
IR_r1cpxv
v
RS
0 5 10 15 20 25 300
16
32
48
64
80
VA_r1cpxv
VB_r1cpxv
VC_r1cpxv
v
RS
Part 2. Relay Model and Relay Settings
Relay Enable-Element Settings
Instantaneous Overcurrent Elements (secondary Amps, again leave off units) for zero sequence (ground) and negativesequence (designated with a Q). elements. These numbers are just made up so don't base your answers on these. Usemagnitudes from the phase A components.
Enable the relay elements you want to use (1 means enabled, 0 means disabled)
ECE 526: Protection of Power Systems II
Lab 3; Page 6/29Spring 2017
Relay 1 Relay 2
E50P1_r1 1 E50P2_r1 1 E50P1_r2 1 E50P2_r2 1
E50Q1_r1 1 E50Q2_r1 1 E50Q1_r2 1 E50Q2_r2 1
E50G1_r1 1 E50G2_r1 1 E50G1_r2 1 E50G2_r2 1
Relay Pickup Settings
Overcurrent element settings for Relay1 and Relay 2 (Overcurrent elements work as fault detectors in the relay model)
Relay 1 Relay 2
Level_1_50P_r1 1 Level_2_50P_r1 1 Level_1_50P_r2 1 Level_2_50P_r2 0.5
Level_1_50Q_r1 1 Level_2_50Q_r1 0.6 Level_1_50Q_r2 1 Level_2_50Q_r2 0.5
Level_1_50G_r1 1 Level_2_50G_r1 0.60 Level_1_50G_r2 1 Level_2_50G_r2 0.5
Level 2 Time Delay Setting for Relay 1 and Relay 2
Define cycles 1 ( Do not change these Time Delay values. )
Relay 1 Relay 2
TDelP_r1 5cycles TDelP_r2 5cycles
TDelQ_r1 5cycles TDelQ_r2 5cycles
TDelG_r1 5 cycles TDelG_r2 5 cycles
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Lab 3; Page 7/29Spring 2017
Distance Element Setting for Relay 1 and Relay 2
Line impedance in Ohm's secondary (i.e. values seen after the CTR and PTR are factored in). Change to match system you are modeling
Relay 1
Z1_r1 1ej 90 deg Z1MAG_r1 Z1_r1 Z1MAG_r1 1
Z1ANG_r1 arg Z1_r1( ) Z1ANG_r1 90 deg
Z0_r1 3 Z1_r1 Z0MAG_r1 Z0_r1 Z0MAG_r1 3
Z0ANG_r1 arg Z0_r1( ) Z0ANG_r1 90 deg
Relay 2
Z1_r2 1ej 90 deg Z1MAG_r2 Z1_r2 Z1MAG_r2 1
Z1ANG_r2 arg Z1_r2( ) Z1ANG_r2 90 deg
Z0_r2 3 Z1_r2 Z0MAG_r2 Z0_r2 Z0MAG_r2 3
Z0ANG_r2 arg Z0_r2( ) Z0ANG_r2 90 deg
Here is the equation for the k0 factor. You might need to enter magnitude and angle seperately in some relays, here it is used as a phasor.
Relay 1 Relay 2
k0_r1Z0_r1 Z1_r1
3 Z1_r1 k0_r1 0.6667 k0_r2
Z0_r2 Z1_r2
3 Z1_r2 k0_r2 0.6667
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Lab 3; Page 8/29Spring 2017
Distance Elements Settings (set as percentage reach) (default values - change as appropriate)
Relay 1 Relay 2
Zone1P_r1 80% Zone1P_r2 80%
Zone1G_r1 80% Zone1G_r2 80%
Zone2P_r1 120% Zone2P_r2 120%
Zone2G_r1 120% Zone2G_r2 120%
Level 2 Time Delays (default values) ( Do not change these Time Delay values. )
Relay 1 Relay 2TDelDP_r1 5cycles TDelDP_r2 5cycles default at 5 cyclesdefault at 5 cycles
TDelDG_r1 5cycles TDelDG_r2 5cycles default at 5 cyclesdefault at 5 cycles
Ground and Phase Distance Elements
Phase Elements (Relay 1)θmho 0deg 0.5deg 360deg k 0 1 719
radMho1P_r1 Zone1P_r1Z1MAG_r1
2 radMho2P_r1 Zone2P_r1
Z1MAG_r12
radMho1G_r1 Zone1G_r1Z1MAG_r1
2 radMho2G_r1 Zone2G_r1
Z1MAG_r12
Note the divide by two for radius of circle
ECE 526: Protection of Power Systems II
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centerMho1_P_r1 Zone1P_r1Z1_r1
2 centerMho2_P_r1 Zone2P_r1
Z1_r12
centerMho1_G_r1 Zone1G_r1Z1_r1
2 centerMho2_G_r1 Zone2G_r1
Z1_r12
Zone1MhoP_r1k centerMho1_P_r1 radMho1P_r1 ej k 0.5 deg
Zone2MhoP_r1k centerMho2_P_r1 radMho2P_r1 ej k 0.5 deg
Zone1MhoG_r1k centerMho1_G_r1 radMho1G_r1 ej k 0.5 deg
Zone2MhoG_r1k centerMho2_G_r1 radMho2G_r1 ej k 0.5 deg
LineZG_r10
Z1_r1
LineZP_r10
Z1_r1
ZABP_r1v
VA_r1cpxv VB_r1cpxv
IA_r1cpxv IB_r1cpxv 0.0001 RABP_r1v Re ZABP_r1v XABP_r1v Im ZABP_r1v
ZBCP_r1v
VB_r1cpxv VC_r1cpxv
IB_r1cpxv IC_r1cpxv 0.0001 RBCP_r1v Re ZBCP_r1v XBCP_r1v Im ZBCP_r1v
ZCAP_r1v
VC_r1cpxv VA_r1cpxv
IC_r1cpxv IA_r1cpxv 0.00001 RCAP_r1v Re ZCAP_r1v XCAP_r1v Im ZCAP_r1v
Ground Elements (Relay 1)
ZAG_r1v
VA_r1cpxv
IA_r1cpxv k0_r1 IR_r1cpxv RAG_r1v Re ZAG_r1v XAG_r1v Im ZAG_r1v
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Lab 3; Page 10/29Spring 2017
ZBG_r1v
VB_r1cpxv
IB_r1cpxv k0_r1 IR_r1cpxv RBG_r1v Re ZBG_r1v XBG_r1v Im ZBG_r1v
ZCG_r1v
VC_r1cpxv
IC_r1cpxv k0_r1 IR_r1cpxv RCG_r1v Re ZCG_r1v XCG_r1v Im ZCG_r1v
Phase Elements (Relay 2)
radMho1P_r2 Zone1P_r2Z1MAG_r2
2 radMho2P_r2 Zone2P_r2
Z1MAG_r22
radMho1G_r2 Zone1G_r2Z1MAG_r2
2 radMho2G_r2 Zone2G_r2
Z1MAG_r22
Note the divide by two for radius of circle
centerMho1_P_r2 Zone1P_r2Z1_r2
2 centerMho2_P_r2 Zone2P_r2
Z1_r22
centerMho1_G_r2 Zone1G_r2Z1_r2
2 centerMho2_G_r2 Zone2G_r2
Z1_r22
Zone1MhoP_r2k centerMho1_P_r2 radMho1P_r2 ej k 0.5 deg
Zone2MhoP_r2k centerMho2_P_r2 radMho2P_r2 ej k 0.5 deg
Zone1MhoG_r2k centerMho1_G_r2 radMho1G_r2 ej k 0.5 deg
Zone2MhoG_r2k centerMho2_G_r2 radMho2G_r2 ej k 0.5 deg
ECE 526: Protection of Power Systems II
Lab 3; Page 11/29Spring 2017
LineZG_r20
Z1_r2
LineZP_r20
Z1_r2
ZABP_r2v
VA_r2cpxv VB_r2cpxv
IA_r2cpxv IB_r2cpxv RABP_r2v Re ZABP_r2v XABP_r2v Im ZABP_r2v
ZBCP_r2v
VB_r2cpxv VC_r2cpxv
IB_r2cpxv IC_r2cpxv 0.00001 RBCP_r2v Re ZBCP_r2v XBCP_r2v Im ZBCP_r2v
ZCAP_r2v
VC_r2cpxv VA_r2cpxv
IC_r2cpxv IA_r2cpxv RCAP_r2v Re ZCAP_r2v XCAP_r2v Im ZCAP_r2v
Ground Elements (Relay 2)
ZAG_r2v
VA_r2cpxv
IA_r2cpxv k0_r2 IR_r2cpxv RAG_r2v Re ZAG_r2v XAG_r2v Im ZAG_r2v
ZBG_r2v
VB_r2cpxv
IB_r2cpxv k0_r2 IR_r2cpxv RBG_r2v Re ZBG_r2v XBG_r2v Im ZBG_r2v
ZCG_r2v
VC_r2cpxv
IC_r2cpxv k0_r2 IR_r2cpxv RCG_r2v Re ZCG_r2v XCG_r2v Im ZCG_r2v
ECE 526: Protection of Power Systems II
Lab 3; Page 12/29Spring 2017
Relay Element Pick Up Logic
Initialize Relay Element Terms (use I2 and I0, not 3*I2 and 3*I0)
Relay 1 Relay 2
Level1Q_r1_puv 0 Level2Q_r1_puv 0 Level1Q_r2_puv 0 Level2Q_r2_puv 0
Level1G_r1_puv 0 Level2G_r1_puv 0 Level1G_r2_puv 0 Level2G_r2_puv 0
Level1P_r1_puv 0 Level2P_r1_puv 0 Level1P_r2_puv 0 Level2P_r2_puv 0
Level1DP_r1_puIf 0 Level2DP_r1_puIf 0 Level1DP_r2_puIf 0 Level2DP_r2_puIf 0
Level1DG_r1_puIf 0 Level2DG_r1_puIf 0 Level1DG_r2_puIf 0 Level2DG_r2_puIf 0
Part 3. Relay 1 pickup logic and trip equations
Negative sequence element (modified to latch and stay one, no drop out for now)
Level1Q_r1_puv 1 IA2_r1v Level_1_50Q_r1if
1 Level1Q_r1_puv 1 0.01if
0 otherwise
Level2Q_r1_puv 1 IA2_r1v Level_2_50Q_r1if
1 Level2Q_r1_puv 1 0.01if
0 otherwise
Ground (zero sequence) element (using calculated instead of measured currents):
Level1G_r1_puv 1 IA0_r1v Level_1_50G_r1if
1 Level1G_r1_puv 1 0.01if
0 otherwise
Level2G_r1_puv 1 IA0_r1v Level_2_50G_r1if
1 Level2G_r1_puv 1 0.01if
0 otherwise
ECE 526: Protection of Power Systems II
Lab 3; Page 13/29Spring 2017
Phase current element (phase A or phase B or Phase C exceed pickup)
Level1P_r1_puv 1 IA_r1cpxv Level_1_50P_r1if
1 IB_r1cpxv Level_1_50P_r1if
1 IC_r1cpxv Level_1_50P_r1if
1 Level1P_r1_puv 1 0.01if
0 otherwise
Level2P_r1_puv 1 IA_r1cpxv Level_2_50P_r1if
1 IB_r1cpxv Level_2_50P_r1if
1 IC_r1cpxv Level_2_50P_r1if
1 Level2P_r1_puv 1 0.01if
0 otherwise
Phase Distance Element Pickup Logic
Level1DP_r1_puIf 1 ZABP_r1If centerMho1_P_r1 radMho1P_r1if
1 ZBCP_r1If centerMho1_P_r1 radMho1P_r1if
1 ZCAP_r1If centerMho1_P_r1 radMho1P_r1if
1 Level1DP_r1_puIf 1 0.01if
0 otherwise
Level2DP_r1_puIf 1 ZABP_r1If centerMho2_P_r1 radMho2P_r1if
1 ZBCP_r1If centerMho2_P_r1 radMho2P_r1if
1 ZCAP_r1If centerMho2_P_r1 radMho2P_r1if
1 Level2DP_r1_puIf 1 0.01if
0 otherwise
ECE 526: Protection of Power Systems II
Lab 3; Page 14/29Spring 2017
2 1 0 1 2
1
1
2
XABP_r1v 19
XBCP_r1v 19
XCAP_r1v 19
Im LineZP_r1( )
Im Zone1MhoP_r1k Im Zone2MhoP_r1k
RABP_r1v 19 RBCP_r1v 19 RCAP_r1v 19 Re LineZP_r1( ) Re Zone1MhoP_r1k Re Zone2MhoP_r1k
Ground Distance Element Pickup LogicLevel1DG_r1_puIf 1 ZAG_r1If centerMho1_G_r1 radMho1G_r1if
1 ZBG_r1If centerMho1_G_r1 radMho1G_r1if
1 ZCG_r1If centerMho1_G_r1 radMho1G_r1if
1 Level1DG_r1_puIf 1 0.01if
0 otherwise
Level2DG_r1_puIf 1 ZAG_r1If centerMho2_G_r1 radMho2G_r1if
1 ZBG_r1If centerMho2_G_r1 radMho2G_r1if
1 ZCG_r1If centerMho2_G_r1 radMho2G_r1if
1 Level2DG_r1_puIf 1 0.01if
0 otherwise
ECE 526: Protection of Power Systems II
Lab 3; Page 15/29Spring 2017
2 1 0 1 2
2
1
1
2
XAG_r1v 19
XBG_r1v 19
XCG_r1v 19
Im LineZG_r1( )
Im Zone1MhoG_r1k Im Zone2MhoG_r1k
RAG_r1v 19 RBG_r1v 19 RCG_r1v 19 Re LineZG_r1( ) Re Zone1MhoG_r1k Re Zone2MhoG_r1k
Relay 2 pickup logic and trip equations:
Negative sequence element (modified to latch and stay one, no drop out for now)
Level1Q_r2_puv 1 IA2_r2v Level_1_50Q_r2if
1 Level1Q_r2_puv 1 0.01if
0 otherwise
Level2Q_r2_puv 1 IA2_r2v Level_2_50Q_r2if
1 Level2Q_r2_puv 1 0.01if
0 otherwise
ECE 526: Protection of Power Systems II
Lab 3; Page 16/29Spring 2017
Ground (zero sequence) element (using calculated instead of measured currents):
Level1G_r2_puv 1 IA0_r2v Level_1_50G_r2if
1 Level1G_r2_puv 1 0.01if
0 otherwise
Level2G_r2_puv 1 IA0_r2v Level_2_50G_r2if
1 Level2G_r2_puv 1 0.01if
0 otherwise
Phase current element (phase A or phase B or Phase C exceed pickup)
Level1P_r2_puv 1 IA_r2cpxv Level_1_50P_r2if
1 IB_r2cpxv Level_1_50P_r2if
1 IC_r2cpxv Level_1_50P_r2if
1 Level1P_r2_puv 1 0.01if
0 otherwise
Level2P_r2_puv 1 IA_r2cpxv Level_2_50P_r2if
1 IB_r2cpxv Level_2_50P_r2if
1 IC_r2cpxv Level_2_50P_r2if
1 Level2P_r2_puv 1 0.01if
0 otherwise
Phase Distance Element Pickup Logic
Level1DP_r2_puIf 1 ZABP_r2If centerMho1_P_r2 radMho1P_r2if
1 ZBCP_r2If centerMho1_P_r2 radMho1P_r2if
1 ZCAP_r2If centerMho1_P_r2 radMho1P_r2if
1 Level1DP_r2_puIf 1 0.01if
0 otherwise
Level2DP_r2_puIf 1 ZABP_r2If centerMho2_P_r2 radMho2P_r2if
1 ZBCP_r2If centerMho2_P_r2 radMho2P_r2if
1 ZCAP_r2If centerMho2_P_r2 radMho2P_r2if
1 Level2DP_r2_puIf 1 0.01if
0 otherwise
ECE 526: Protection of Power Systems II
Lab 3; Page 17/29Spring 2017
2 1 0 1 2
3
2
1
1
2
XABP_r2v 19
XBCP_r2v 19
XCAP_r2v 19
Im LineZP_r2( )
Im Zone1MhoP_r2k Im Zone2MhoP_r2k
RABP_r2v 19 RBCP_r2v 19 RCAP_r2v 19 Re LineZP_r2( ) Re Zone1MhoP_r2k Re Zone2MhoP_r2k
Ground Distance Element Pickup Logic
Level2DG_r2_puIf 1 ZAG_r2If centerMho2_G_r2 radMho2G_r2if
1 ZBG_r2If centerMho2_G_r2 radMho2G_r2if
1 ZCG_r2If centerMho2_G_r2 radMho2G_r2if
1 Level2DG_r2_puIf 1 0.01if
0 otherwise
Level1DG_r2_puIf 1 ZAG_r2If centerMho1_G_r2 radMho1G_r2if
1 ZBG_r2If centerMho1_G_r2 radMho1G_r2if
1 ZCG_r2If centerMho1_G_r2 radMho1G_r2if
1 Level1DG_r2_puIf 1 0.01if
0 otherwise
ECE 526: Protection of Power Systems II
Lab 3; Page 18/29Spring 2017
2 1 0 1 2
2
2
XAG_r2v 19
XBG_r2v 19
XCG_r2v 19
Im LineZG_r2( )
Im Zone1MhoG_r2k Im Zone2MhoG_r2k
RAG_r2v 19 RBG_r2v 19 RCG_r2v 19 Re LineZG_r2( ) Re Zone1MhoG_r2k Re Zone2MhoG_r2k
Part 4. Trip Logic and Relay Response
Note that logic AND is Ctrl + shift + 7, the logic OR is Ctrl + shift + 6, the logic not is Ctrl + shift +1.
(1) Conventional Trip Logic without CommunicationRelay 1
Level2P_r1_pu_t_delayd Level2P_r1_pud TDelP_r1 RS Note that this makes the time delay for level 2
TR50P_r1v E50P1_r1 Level1P_r1_puv E50P2_r1 Level2P_r1_pu_t_delayv
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Lab 3; Page 19/29Spring 2017
Level2Q_r1_pu_t_delayd Level2Q_r1_pud TDelQ_r1 RS Note that this makes the time delay for level 2
TR50Q_r1v E50Q1_r1 Level1Q_r1_puv E50Q2_r1 Level2Q_r1_pu_t_delayv
Level2G_r1_pu_t_delayd Level2G_r1_pud TDelG_r1 RS Note that this makes the time delay for level 2
TR50G_r1v E50G1_r1 Level1G_r1_puv E50G2_r1 Level2G_r1_pu_t_delayv
TR50_r1v TR50P_r1v TR50Q_r1v TR50G_r1v
Level2DP_r1_pu_t_delayd Level2DP_r1_pud TDelDP_r1 RS Note that this makes the time delay for level 2
TR21P_r1v Level1DP_r1_puv Level2DP_r1_pu_t_delayv
Level2DG_r1_pu_t_delayd Level2DG_r1_pud TDelDG_r1 RS Note that this makes the time delay for level 2
TR21G_r1v Level1DG_r1_puv Level2DG_r1_pu_t_delayv
TR21_r1v TR21P_r1v TR21G_r1v
Relay 2
Level2P_r2_pu_t_delayd Level2P_r2_pud TDelP_r2 RS Note that this makes the time delay for level 2
TR50P_r2v E50P1_r2 Level1P_r2_puv E50P2_r2 Level2P_r2_pu_t_delayv
Level2Q_r2_pu_t_delayd Level2Q_r2_pud TDelQ_r2 RS Note that this makes the time delay for level 2
TR50Q_r2v E50Q1_r2 Level1Q_r2_puv E50Q2_r2 Level2Q_r2_pu_t_delayv
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Level2G_r2_pu_t_delayd Level2G_r2_pud TDelG_r2 RS Note that this makes the time delay for level 2
TR50G_r2v E50G1_r2 Level1G_r2_puv E50G2_r2 Level2G_r2_pu_t_delayv
TR50_r2v TR50P_r2v TR50Q_r2v TR50G_r2v
Level2DP_r2_pu_t_delayd Level2DP_r2_pud TDelDP_r2 RS Note that this makes the time delay for level 2
TR21P_r2v Level1DP_r2_puv Level2DP_r2_pu_t_delayv
Level2DG_r2_pu_t_delayd Level2DG_r2_pud TDelDG_r2 RS Note that this makes the time delay for level 2
TR21G_r2v Level1DG_r2_puv Level2DG_r2_pu_t_delayv
TR21_r2v TR21P_r2v TR21G_r2v
Final Trip LogicTR_r1v TR21_r1v TR50_r1v
TR_r2v TR21_r2v TR50_r2v
ECE 526: Protection of Power Systems II
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Relay responses Remote RelayLocal Relay
0 20 40 600
0.5
1
1.5
TR21G_r1v
v
RS
0 20 40 600
0.5
1
1.5
TR_r2v
v
RS
(2) Direct Underreaching Transfer Trip (DUTT) Scheme
Communication Time delay: TDelComm .5cycles ( Do not change the TDelComm value )
Transmitted Signals
TRzone1_r1v E50P1_r1 Level1P_r1_puv E50Q1_r1 Level1Q_r1_puv E50G1_r1 Level1G_r1_puv Level1DP_r1_puv Level1DG_r1_puv
TX_r1v TRzone1_r1v
TRzone1_r2v E50P1_r2 Level1P_r2_puv E50Q1_r2 Level1Q_r2_puv E50G1_r2 Level1G_r2_puv Level1DP_r2_puv Level1DG_r2_puv
TX_r2v TRzone1_r2v
ECE 526: Protection of Power Systems II
Lab 3; Page 22/29Spring 2017
Received Signals (with communication time delay)TX_r2_t_delayd2 TX_r2d2 TDelComm RS Note that this makes the time delay for Communication
RX_r1v TX_r2_t_delayv
TX_r1_t_delayd2 TX_r1d2 TDelComm RS Note that this makes the time delay for Communication
RX_r2v TX_r1_t_delayv
Final Trip LogicTR_DUTT_r1v TRzone1_r1v RX_r1v
TR_DUTT_r2v TRzone1_r2v RX_r2v
Relay responses (observe if there is a time difference, compared to POTT or case without communication)
0 20 40 600
0.5
1
1.5
TR_DUTT_r1v
v
RS
0 20 40 600
0.5
1
1.5
TR_DUTT_r2v
v
RS
ECE 526: Protection of Power Systems II
Lab 3; Page 23/29Spring 2017
(3) Permissive Overreaching Transfer Trip (POTT) Scheme
Communication Time delay: TDelComm 0.5cycles
Transmitted Signals
TRzone2_r1v E50P2_r1 Level2G_r1_puv E50Q2_r1 Level2Q_r1_puv E50G2_r1 Level2G_r1_puv Level2DG_r1_puv Level2DG_r1_puv
TX_r1v TRzone2_r1v
TRzone2_r2v E50P2_r2 Level2P_r2_puv E50Q2_r2 Level2Q_r2_puv E50G2_r2 Level2G_r2_puv Level2DP_r2_puv Level2DG_r2_puv
TX_r2v TRzone2_r2v
Received Signals (with communication time delay)
TX_r2_t_delayd2 TX_r2d2 TDelComm RS Note that this makes the time delay for Communication
RX_r1v TX_r2_t_delayv
TX_r1_t_delayd2 TX_r1d2 TDelComm RS Note that this makes the time delay for Communication
RX_r2v TX_r1_t_delayv
Final Trip Logic
TR_POTT_r1v TRzone2_r1v RX_r1v
TR_POTT_r2v TRzone2_r2v RX_r2v
ECE 526: Protection of Power Systems II
Lab 3; Page 24/29Spring 2017
Relay responses
0 20 40 600
0.5
1
1.5
TR_POTT_r1v
v
RS
0 20 40 600
0.5
1
1.5
TR_POTT_r2v
v
RS
The Directional Elements:
Relay 1 Directional Element
Relay 1
Z1_r1 1ej 90 deg Z1MAG_r1 Z1_r1 Z1MAG_r1 1
Z1ANG_r1 arg Z1_r1( ) Z1ANG_r1 90 deg
Z0_r1 3 Z1_r1 Z0MAG_r1 Z0_r1 Z0MAG_r1 3
Z0ANG_r1 arg Z0_r1( ) Z0ANG_r1 90 deg
ECE 526: Protection of Power Systems II
Lab 3; Page 25/29Spring 2017
MTA Z1ANG_r1
Create symmetrical components:
Phase A Components:
0 10 200
2
4
6
8
10
IA0_r1v
IA1_r1v
IA2_r1v
v
RS
0 10 200
20
40
60
80
VA0_r1v
VA1_r1v
VA2_r1v
v
RS
ECE 526: Protection of Power Systems II
Lab 3; Page 26/29Spring 2017
Calculate negative sequence impedance and zero sequence impedance
Z2A_r1v
Re VA2_r1v IA2_r1v 1 ej Z1ANG_r1
IA2_r1v 2 .0001
Avoid divide by 0 Z2halfLine1Z1MAG_r1
20.01
Z2halfLine2Z1MAG_r1
20.01
0 20 40 601.5
1
0.5
0
0.5
1
Z2A_r1v
Z2halfLine1
Z2halfLine2
v
RS
ECE 526: Protection of Power Systems II
Lab 3; Page 27/29Spring 2017
Relay 2 Directional Element
Relay 2
Z1_r2 1ej 90 deg Z1MAG_r2 Z1_r2 Z1MAG_r2 1
Z1ANG_r2 arg Z1_r2( ) Z1ANG_r2 90 deg
Z0_r2 3 Z1_r2 Z0MAG_r2 Z0_r2 Z0MAG_r2 3
Z0ANG_r2 arg Z0_r2( ) Z0ANG_r2 90 deg
Create symmetrical components:
Phase A Components:
ECE 526: Protection of Power Systems II
Lab 3; Page 28/29Spring 2017
0 5 100
2
4
6
8
10
IA0_r2v
IA1_r2v
IA2_r2v
v
RS
0 5 100
20
40
60
80
VA0_r2v
VA1_r2v
VA2_r2v
v
RS
Calculate negative sequence impedance and zero sequence impedance
Z2A_r2v
Re VA2_r2v IA2_r2v 1 ej Z1ANG_r2
IA2_r2v 2 .00001
Z2halfLine1Z1MAG_r1
20.01 Z2halfLine2
Z1MAG_r12
0.01
ECE 526: Protection of Power Systems II
Lab 3; Page 29/29Spring 2017
0 20 40 601
0
1
2
3
4
Z2A_r2v
Z2halfLine1
Z2halfLine2
v
RS