Communication-Assisted Transfer Trip Schemes

Transcription

1 Session 17; Page 1/4 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 remoe the table currently at 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 ariable 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.cs. * 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...\slg5r1.cfg Right click on the floppy disk icon and select "Choose File" to open a file browser. Choose the *.cfg file from the contrade file (you will need to type the extension). MathCAD 13 or higher users, right click and select properties. data...\slg5r1.dat Right click on the floppy disk icon and select "Choose File" to open a file browser. Choose the *.dat file from the contrade file (it should be an accepted file type)

2 Session 17; Page /4 COMTRADE configuration file format: 1. The first row (row ) states how the file was created and the ersion of the standard. The second row (row 1) gies the total number of inputs (14 for these cases), number of analog inputs (14 here) and number of digital inputs ( here) 3. Rows -8 are the analog inputs for relay 1 in this model, in the following order: In (referred to as residual current below) Ia Ib Ic Van at Bus 1 Vbn Vcn Rows 9-15 are the analog inputs for relay in this model, in the following order: In (referred to as residual current below) Ia Ib Ic Van at Bus Vbn Vcn 4. Data sampled 16 times per cycle (96 Hz) User Entered Parameters: I am entering typical alues the current transformer ration (CTR) and oltage transformer ratio (PTR). You need to change these to match your calculations. CTR 1 PTR 1 Same for both relay models Sampling rate (samples/sec) 16 Click on the Arrow to hide/unhide the digital filtering, angle calculations and symmterical components calculations Now plot the currents and oltages. These should be sinusoidal. Note that the horizontal axis is in the number of cycles since the i/ is sample number diided by sampling rate. As a check, the prefault data should be balanced three phase

3 Session 17; Page 3/4 Relay 1 phase currents and residual current IA_r1 i IB_r1 i IC_r1 i 1 5 IR_r1 i i VA_r1 i VB_r1 i 3 1 VC_r1 i i IA_r1 IA1_r1 IA_r1 1 VA_r1 VA1_r1 VA_r

4 Session 17; Page 4/4 8 Compare 3I to measured residual (ground current) 6 3 IA_r1 4 IR_r1cpx Relay phase currents and residual current 5 1 Relay line to ground oltages:

5 Session 17; Page 5/4 3 3 IA_r i IB_r i 1 VA_r i 1 IC_r i VB_r i IR_r i 1 VC_r i i Symmetrical Components: phasor with magnitude and phase (we are only uses magnitude for now). i

6 Session 17; Page 6/ IA_r1cpx IB_r1cpx IC_r1cpx IR_r1cpx 4 VA_r1cpx VB_r1cpx VC_r1cpx Part. Relay Model and Relay Settings Relay Enable-Element Settings Instantaneous Oercurrent Elements (secondary Amps, again leae off units) for zero sequence (ground) and negatie sequence (designated with a Q). elements. These numbers are just made up so don't base your answers on these. Use magnitudes from the phase A components. Enable the relay elements you want to use (1 means enabled, means disabled) Relay 1 Relay

7 Session 17; Page 7/4 E5P1_r1 1 E5P_r1 1 E5P1_r 1 E5P_r 1 E5Q1_r1 1 E5Q_r1 1 E5Q1_r 1 E5Q_r 1 E5G1_r1 1 E5G_r1 1 E5G1_r 1 E5G_r 1 Relay Pickup Settings Oercurrent element settings for Relay1 and Relay (Oercurrent elements work as fault detectors in the relay model) Relay 1 Relay Leel_1_5P_r1.75 Leel 5P_r1.5 Leel_1_5P_r.75 Leel 5P_r.5 Leel_1_5Q_r1.75 Leel 5Q_r1.5 Leel_1_5Q_r.75 Leel 5Q_r.5 Leel_1_5G_r1.75 Leel 5G_r1.5 Leel_1_5G_r.75 Leel 5G_r.5 Leel Time Delay Setting for Relay 1 and Relay Define cycles 1 ( Do not change these Time Delay alues. ) Relay 1 Relay T DelP_r1 5cycles T DelP_r 5cycles T DelQ_r1 5cycles T DelQ_r 5cycles T DelG_r1 5cycles T DelG_r 5cycles Distance Element Setting for Relay 1 and Relay

8 Session 17; Page 8/4 Line impedance in Ohm's secondary (i.e. alues seen after the CTR and PTR are factored in). Change to match system you are modeling Relay 1 Z1_r1 1.5e j84 deg Z1MAG_r1 Z1_r1 Z1MAG_r1 1.5 Z1ANG_r1 arg( Z1_r1) Z1ANG_r1 84deg Z_r1 3Z1_r1 ZMAG_r1 Z_r1 ZMAG_r ZANG_r1 arg( Z_r1) ZANG_r1 84deg Relay Z1_r Z1_r1 Z1MAG_r Z1_r Z1MAG_r 1.5 Z1ANG_r arg( Z1_r) Z1ANG_r 84deg Z_r 3Z1_r ZMAG_r Z_r ZMAG_r 3.15 ZANG_r arg( Z_r) ZANG_r 84deg Here is the equation for the k factor. You might need to enter magnitude and angle seperately in some relays, here it is used as a phasor. Relay 1 Relay Z_r1 Z1_r1 k_r1 k_r Z1_r1 Z_r Z1_r k_r k_r Z1_r Distance Elements Settings (set as percentage reach) (default alues - change as appropriate)

9 Session 17; Page 9/4 Relay 1 Relay Zone1P_r1 8% Zone1P_r 8% Zone1G_r1 8% Zone1G_r 8% ZoneP_r1 1% ZoneP_r 1% ZoneG_r1 1% ZoneG_r 1% Turn on memory polarizing approximation be setting this equal to. Otherwise the element is self polarized. Approximation only works if you are looking at forward faults. Mem_pol_on 1 Z s1p [ (.5 j5) ] if Mem_pol_on 1 Z r1p [ ( j) ] if Mem_pol_on 1 Leel Time Delays (default alues) ( Do not change these Time Delay alues. ) Relay 1 Relay T DelDP_r1 5cycles T DelDP_r 5cycles default at 5 cycles T DelDG_r1 5cycles T DelDG_r 5cycles default at 5 cycles default at 5 cycles default at 5 cycles Ground and Phase Distance Elements Phase Elements (Relay 1)

10 Session 17; Page 1/4 θmho deg.5deg 36deg k Z1_r1 Z s1p radmho1p_r1 Zone1P_r1 radmhop_r1 ZoneP_r1 Z1_r1 Z s1p Approximation of memory polarized mho expanzion radmho1g_r1 Zone1G_r1 Z1_r1 Z s1p radmhog_r1 ZoneG_r1 Z1_r1 Z s1p Z1_r1 Z s1p Z1_r1 Z s1p centermho1_p_r1 Zone1P_r1 centermho_p_r1 ZoneP_r1 Z1_r1 Z s1p Z1_r1 Z s1p centermho1_g_r1 Zone1G_r1 centermho_g_r1 ZoneG_r1 Zone1MhoP_r1 centermho1_p_r1 radmho1p_r1e jk.5deg k ZoneMhoP_r1 centermho_p_r1 radmhop_r1e jk.5deg k Zone1MhoG_r1 centermho1_g_r1 radmho1g_r1e jk.5deg k ZoneMhoG_r1 centermho_g_r1 radmhog_r1e jk.5deg k LineZP_r1 Z1_r1 LineZG_r1 Z1_r1 VA_r1cpx VB_r1cpx ZABP_r1 RABP_r1 IA_r1cpx IB_r1cpx Re ZABP_r1 XABP_r1 Im ZABP_r1 VB_r1cpx VC_r1cpx ZBCP_r1 RBCP_r1 IB_r1cpx IC_r1cpx Re ZBCP_r1 XBCP_r1 Im ZBCP_r1

11 Session 17; Page 11/4 VC_r1cpx VA_r1cpx ZCAP_r1 RCAP_r1 IC_r1cpx IA_r1cpx Re ZCAP_r1 XCAP_r1 Im ZCAP_r1 Ground Elements (Relay 1) ZAG_r1 VA_r1cpx IA_r1cpx k_r1ir_r1cpx RAG_r1 Re ZAG_r1 XAG_r1 Im ZAG_r1 VB_r1cpx ZBG_r1 RBG_r1 IB_r1cpx k_r1ir_r1cpx Re ZBG_r1 XBG_r1 Im ZBG_r1 VC_r1cpx ZCG_r1 RCG_r1 IC_r1cpx k_r1ir_r1cpx Re ZCG_r1 XCG_r1 Im ZCG_r1 Phase Elements (Relay ) radmho1p_r Zone1P_r Z1_r Z r1p Z1_r Z r1p radmhop_r ZoneP_r radmho1g_r Zone1G_r Z1_r Z r1p Z1_r Z r1p radmhog_r ZoneG_r Note the diide by two for radius of circle Z1_r Z r1p Z1_r Z r1p centermho1_p_r Zone1P_r centermho_p_r ZoneP_r Z1_r Z r1p Z1_r Z r1p centermho1_g_r Zone1G_r centermho_g_r ZoneG_r

12 Session 17; Page 1/4 Zone1MhoP_r centermho1_p_r radmho1p_re jk.5deg k ZoneMhoP_r centermho_p_r radmhop_re jk.5deg k Zone1MhoG_r centermho1_g_r radmho1g_re jk.5deg k ZoneMhoG_r centermho_g_r radmhog_re jk.5deg k LineZP_r Z1_r LineZG_r Z1_r VA_rcpx VB_rcpx ZABP_r RABP_r IA_rcpx IB_rcpx Re ZABP_r XABP_r Im ZABP_r VB_rcpx VC_rcpx ZBCP_r RBCP_r IB_rcpx IC_rcpx Re ZBCP_r XBCP_r Im ZBCP_r VC_rcpx VA_rcpx ZCAP_r RCAP_r IC_rcpx IA_rcpx Re ZCAP_r XCAP_r Im ZCAP_r Ground Elements (Relay ) ZAG_r VA_rcpx IA_rcpx k_rir_rcpx RAG_r Re ZAG_r XAG_r Im ZAG_r VB_rcpx ZBG_r RBG_r IB_rcpx k_rir_rcpx Re ZBG_r XBG_r Im ZBG_r VC_rcpx ZCG_r RCG_r IC_rcpx k_rir_rcpx Re ZCG_r XCG_r Im ZCG_r

13 Session 17; Page 13/4 Relay Element Pick Up Logic Initialize Relay Element Terms (use I and I, not 3*I and 3*I) Relay 1 Relay Leel1Q_r1_pu LeelQ_r1_pu Leel1Q_r_pu LeelQ_r_pu Leel1G_r1_pu LeelG_r1_pu Leel1G_r_pu LeelG_r_pu Leel1P_r1_pu LeelP_r1_pu Leel1P_r_pu LeelP_r_pu Leel1DP_r1_pu LeelDP_r1_pu Leel1DP_r_pu LeelDP_r_pu Leel1DG_r1_pu LeelDG_r1_pu Leel1DG_r_pu LeelDG_r_pu Part 3. Relay 1 pickup logic and trip equations Negatie sequence element (modified to latch and stay one, no drop out for now) Leel1Q_r1_pu 1 if IA_r1 Leel_1_5Q_r1 LeelQ_r1_pu 1 if IA_r1 Leel 5Q_r1 1 if Leel1Q_r1_pu if LeelQ_r1_pu.1 1 Ground (zero sequence) element (using calculated instead of measured currents): Leel1G_r1_pu 1 if IA_r1 Leel_1_5G_r1 LeelG_r1_pu 1 if IA_r1 Leel 5G_r1 1 if Leel1G_r1_pu if LeelG_r1_pu.1 1

14 Session 17; Page 14/4 Phase current element (phase A or phase B or Phase C exceed pickup) Leel1P_r1_pu 1 if IA_r1cpx Leel_1_5P_r1 LeelP_r1_pu 1 if IA_r1cpx Leel 5P_r1 1 if IB_r1cpx Leel_1_5P_r1 1 if IC_r1cpx Leel_1_5P_r1 1 if Leel1P_r1_pu if IB_r1cpx Leel 5P_r1 1 if IC_r1cpx Leel 5P_r1 1 if LeelP_r1_pu.1 1 Phase Distance Element Pickup Logic Leel1DP_r1_pu 1 if ZABP_r1 centermho1_p_r1 radmho1p_r1 LeelDP_r1_pu 1 if ZABP_r1 centermho_p_r1 radmhop_r1 1 if ZBCP_r1 centermho1_p_r1 radmho1p_r1 1 if ZBCP_r1 centermho_p_r1 radmhop_r1 1 if ZCAP_r1 centermho1_p_r1 radmho1p_r1 1 if ZCAP_r1 centermho_p_r1 radmhop_r1 1 if Leel1DP_r1_pu if LeelDP_r1_pu.1 1

15 Session 17; Page 15/4 XABP_r1 19 XBCP_r1 19 XCAP_r1 19 Im( LineZP_r1) ImZone1MhoP_r1 k ImZoneMhoP_r1 k RABP_r1 19 RBCP_r1 19 RCAP_r1 19 Re( LineZP_r1) Re Zone1MhoP_r1 k Re ZoneMhoP_r1 k Ground Distance Element Pickup Logic Leel1DG_r1_pu 1 if ZAG_r1 centermho1_g_r1 radmho1g_r1 LeelDG_r1_pu 1 if ZAG_r1 centermho_g_r1 radmhog_r1 1 if ZBG_r1 centermho1_g_r1 radmho1g_r1 1 if ZBG_r1 centermho_g_r1 radmhog_r1 1 if ZCG_r1 centermho1_g_r1 radmho1g_r1 1 if ZCG_r1 centermho_g_r1 radmhog_r1 1 if Leel1DG_r1_pu if LeelDG_r1_pu.1 1

16 Session 17; Page 16/4 XAG_r1 19 XBG_r1 19 XCG_r1 19 Im( LineZG_r1) ImZone1MhoG_r1 k ImZoneMhoG_r1 k RAG_r1 19 RBG_r1 19 RCG_r1 19 Re( LineZG_r1) Re Zone1MhoG_r1 k Re ZoneMhoG_r1 k Relay pickup logic and trip equations: Negatie sequence element (modified to latch and stay one, no drop out for now) Leel1Q_r_pu 1 if IA_r Leel_1_5Q_r LeelQ_r_pu 1 if IA_r Leel 5Q_r 1 if Leel1Q_r_pu if LeelQ_r_pu.1 1

17 Session 17; Page 17/4 Ground (zero sequence) element (using calculated instead of measured currents): Leel1G_r_pu 1 if IA_r Leel_1_5G_r LeelG_r_pu 1 if IA_r Leel 5G_r 1 if Leel1G_r_pu if LeelG_r_pu.1 1 Phase current element (phase A or phase B or Phase C exceed pickup) Leel1P_r_pu 1 if IA_rcpx Leel_1_5P_r LeelP_r_pu 1 if IA_rcpx Leel 5P_r 1 if IB_rcpx Leel_1_5P_r 1 if IC_rcpx Leel_1_5P_r 1 if Leel1P_r_pu if IB_rcpx Leel 5P_r 1 if IC_rcpx Leel 5P_r 1 if LeelP_r_pu.1 1 Phase Distance Element Pickup Logic

18 Session 17; Page 18/4 Leel1DP_r_pu 1 if ZABP_r centermho1_p_r radmho1p_r LeelDP_r_pu 1 if ZABP_r centermho_p_r radmhop_r 1 if ZBCP_r centermho1_p_r radmho1p_r 1 if ZBCP_r centermho_p_r radmhop_r 1 if ZCAP_r centermho1_p_r radmho1p_r 1 if ZCAP_r centermho_p_r radmhop_r 1 if Leel1DP_r_pu if LeelDP_r_pu.1 1 XABP_r 19 XBCP_r 19 XCAP_r 19 Im( LineZP_r) ImZone1MhoP_r k ImZoneMhoP_r k 1 1 RABP_r 19 RBCP_r 19 RCAP_r 19 Re( LineZP_r) Re Zone1MhoP_r k Re ZoneMhoP_r k Ground Distance Element Pickup Logic

19 Session 17; Page 19/4 Leel1DG_r_pu 1 if ZAG_r centermho1_g_r radmho1g_r LeelDG_r_pu 1 if ZAG_r centermho_g_r radmhog_r 1 if ZBG_r centermho1_g_r radmho1g_r 1 if ZBG_r centermho_g_r radmhog_r 1 if ZCG_r centermho1_g_r radmho1g_r 1 if ZCG_r centermho_g_r radmhog_r 1 if Leel1DG_r_pu if LeelDG_r_pu XAG_r 19 XBG_r 19 XCG_r Im( LineZG_r) ImZone1MhoG_r k ImZoneMhoG_r k 1 3 RAG_r 19 RBG_r 19 RCG_r 19 Re( LineZG_r) Re Zone1MhoG_r k Re ZoneMhoG_r k Part 4. Trip Logic and Relay Response

20 Session 17; Page /4 Note that logic AND is Ctrl + shift + 7, the logic OR is Ctrl + shift + 6, the logic not is Ctrl + shift +1. (1) Conentional Trip Logic without Communication Relay 1 LeelP_r1_pu_t_delay d Note that this makes the time delay for leel LeelP_r1_pu d TDelP_r1 TR5P_r1 E5P1_r1 Leel1P_r1_pu E5P_r1 LeelP_r1_pu_t_delay LeelQ_r1_pu_t_delay d Note that this makes the time delay for leel LeelQ_r1_pu d TDelQ_r1 TR5Q_r1 E5Q1_r1 Leel1Q_r1_pu E5Q_r1 LeelQ_r1_pu_t_delay LeelG_r1_pu_t_delay d Note that this makes the time delay for leel LeelG_r1_pu d TDelG_r1 TR5G_r1 E5G1_r1 Leel1G_r1_pu E5G_r1 LeelG_r1_pu_t_delay TR5_r1 TR5P_r1 TR5Q_r1 TR5G_r1 LeelDP_r1_pu_t_delay d Note that this makes the time delay for leel LeelDP_r1_pu d TDelDP_r1 TR1P_r1 Leel1DP_r1_pu LeelDP_r1_pu_t_delay LeelDG_r1_pu_t_delay d Note that this makes the time delay for leel LeelDG_r1_pu d TDelDG_r1 TR1G_r1 Leel1DG_r1_pu LeelDG_r1_pu_t_delay TR1_r1 TR1P_r1 TR1G_r1 Relay

21 Session 17; Page 1/4 LeelP_r_pu_t_delay d Note that this makes the time delay for leel LeelP_r_pu d TDelP_r TR5P_r E5P1_r Leel1P_r_pu E5P_r LeelP_r_pu_t_delay LeelQ_r_pu_t_delay d Note that this makes the time delay for leel LeelQ_r_pu d TDelQ_r TR5Q_r E5Q1_r Leel1Q_r_pu E5Q_r LeelQ_r_pu_t_delay LeelG_r_pu_t_delay d Note that this makes the time delay for leel LeelG_r_pu d TDelG_r TR5G_r E5G1_r Leel1G_r_pu E5G_r LeelG_r_pu_t_delay TR5_r TR5P_r TR5Q_r TR5G_r LeelDP_r_pu_t_delay d Note that this makes the time delay for leel LeelDP_r_pu d TDelDP_r TR1P_r Leel1DP_r_pu LeelDP_r_pu_t_delay LeelDG_r_pu_t_delay d Note that this makes the time delay for leel LeelDG_r_pu d TDelDG_r TR1G_r Leel1DG_r_pu LeelDG_r_pu_t_delay TR1_r TR1P_r TR1G_r Final Trip Logic TR_r1 TR1_r1 TR5_r1 TR_r TR1_r TR5_r

22 Session 17; Page /4 Relay responses Local Relay Remote Relay TR_r1 TR_r

23 Session 17; Page 3/4 () Permissie Oerreaching Transfer Trip (POTT) Scheme Communication Time delay: T DelComm.5cycles Transmitted Signals LeelDP_r1_pu LeelDG_r1_pu TRzone_r1 E5P_r1 LeelP_r1_pu E5Q_r1 LeelQ_r1_pu E5G_r1 LeelG_r1_pu TX_r1 TRzone_r1 LeelDP_r_pu LeelDG_r_pu TRzone_r E5P_r LeelP_r_pu E5Q_r LeelQ_r_pu E5G_r LeelG_r_pu TX_r TRzone_r Receied Signals (with communication time delay) TX_r_t_delay d TX_r d TDelComm Note that this makes the time delay for Communication RX_r1 TX_r_t_delay TX_r1_t_delay d TX_r1 d TDelComm Note that this makes the time delay for Communication RX_r TX_r1_t_delay Final Trip Logic TR_POTT_r1 TRzone_r1 RX_r1 TR_POTT_r TRzone_r RX_r

24 Session 17; Page 4/4 Relay responses TR_POTT_r1 TR_POTT_r