From fu at ece.msstate.edu Wed Sep 1 16:33:25 2010 From: fu at ece.msstate.edu (Yong Fu) Date: Wed Sep 1 16:33:35 2010 Subject: [ece4643] about ECE4643_6643 homework Message-ID: <13791739.76651283376805089.JavaMail.root@zimbra.ece.msstate.edu> Dear All, I uploaded notes and homework 2 on the class website https://sites.google.com/site/powersystemrelayingandcontrol/ Due Day is next Wednesday. For distance learning students, you can scan and email to me by next Wednesday. Any questions, feel free to let me know. Thanks. Yong ==================================================== Yong Fu, Ph.D. Assistant Professor Department of Electrical and Computer Engineering Mississippi State University Room 239 Simrall Bldg. 406 Hardy Rd., P.O. Box 9571 Mississippi State, MS 39762 Phone: 662-325-3878 Fax: 662-325-2298 Homepage: http://www.ece.msstate.edu/~fu ==================================================== From fu at ece.msstate.edu Wed Sep 1 19:37:01 2010 From: fu at ece.msstate.edu (Yong Fu) Date: Wed Sep 1 19:37:10 2010 Subject: [ece4643-01] [ece4643] about ECE4643_6643 homework In-Reply-To: Message-ID: <16907484.78371283387821084.JavaMail.root@zimbra.ece.msstate.edu> Right. Let me update it tomorrow. Thanks. ==================================================== Yong Fu, Ph.D. Assistant Professor Department of Electrical and Computer Engineering Mississippi State University Room 239 Simrall Bldg. 406 Hardy Rd., P.O. Box 9571 Mississippi State, MS 39762 Phone: 662-325-3878 Fax: 662-325-2298 Homepage: http://www.ece.msstate.edu/~fu ==================================================== ----- Original Message ----- From: "Uttam Adhikari" To: "Yong Fu" Sent: Wednesday, September 1, 2010 7:28:05 PM GMT -06:00 US/Canada Central Subject: Re: [ece4643-01] [ece4643] about ECE4643_6643 homework Dr. Fu, I am going through the homework. How about the generator 2 grounding.Is it open or something is missing. thank you Regards Uttam On Wed, Sep 1, 2010 at 4:33 PM, Yong Fu < fu@ece.msstate.edu > wrote: Dear All, I uploaded notes and homework 2 on the class website https://sites.google.com/site/powersystemrelayingandcontrol/ Due Day is next Wednesday. For distance learning students, you can scan and email to me by next Wednesday. Any questions, feel free to let me know. Thanks. Yong ==================================================== Yong Fu, Ph.D. Assistant Professor Department of Electrical and Computer Engineering Mississippi State University Room 239 Simrall Bldg. 406 Hardy Rd., P.O. Box 9571 Mississippi State, MS 39762 Phone: 662-325-3878 Fax: 662-325-2298 Homepage: http://www.ece.msstate.edu/~fu ==================================================== _______________________________________________ ece4643 mailing list ece4643@ece.msstate.edu http://www.ece.msstate.edu/mailman/listinfo/ece4643 _______________________________________________ ece4643-01 mailing list ece4643-01@ece.msstate.edu http://www.ece.msstate.edu/mailman/listinfo/ece4643-01 -- Uttam Adhikari Graduate Research Assistant Center For Advanced Vehicular System(CAVS) Mississippi State University, MS 39762 From dlm195 at msstate.edu Fri Sep 10 09:24:03 2010 From: dlm195 at msstate.edu (Delos Leelon McManus) Date: Fri Sep 10 09:24:50 2010 Subject: [ece4643] ANSI / IEEE Standard C37.2 In-Reply-To: <13791739.76651283376805089.JavaMail.root@zimbra.ece.msstate.edu> References: <13791739.76651283376805089.JavaMail.root@zimbra.ece.msstate.edu> Message-ID: All, FYI. You will be seeing this a lot?in the field, so it might be worth?your time to look over the standard a little to familiarize?yourself?with it. Thank You, Delos?Mc?Manus -------------- next part -------------- A non-text attachment was scrubbed... Name: IEEE Standard C37.2.pdf Type: application/pdf Size: 1164143 bytes Desc: not available Url : http://www.ece.msstate.edu/pipermail/ece4643/attachments/20100910/18f17ff4/IEEEStandardC37.2-0001.pdf From fu at ece.msstate.edu Fri Sep 10 12:27:08 2010 From: fu at ece.msstate.edu (Yong Fu) Date: Fri Sep 10 12:27:20 2010 Subject: [ece4643] about today's homework and solution In-Reply-To: <10235473.102531284139586541.JavaMail.root@zimbra.ece.msstate.edu> Message-ID: <26254819.102551284139628597.JavaMail.root@zimbra.ece.msstate.edu> All, I uploaded the solution of Homework 1 and today?s Homework 3 on our class website. https://sites.google.com/site/powersystemrelayingandcontrol/home Thanks. Yong ==================================================== Yong Fu, Ph.D. Assistant Professor Department of Electrical and Computer Engineering Mississippi State University Room 239 Simrall Bldg. 406 Hardy Rd., P.O. Box 9571 Mississippi State, MS 39762 Phone: 662-325-3878 Fax: 662-325-2298 Homepage: http://www.ece.msstate.edu/~fu ==================================================== From fu at ece.msstate.edu Fri Sep 17 15:46:23 2010 From: fu at ece.msstate.edu (Yong Fu) Date: Fri Sep 17 15:47:24 2010 Subject: [ece4643] about Schweitzer Engineering Laboratories visit In-Reply-To: <26100587.132441284756350996.JavaMail.root@zimbra.ece.msstate.edu> Message-ID: <31752058.132461284756383894.JavaMail.root@zimbra.ece.msstate.edu> Dear All, Next Tuesday (21/09) and Wednesday (22/09), Schweitzer Engineering Laboratories (SEL) will visit MSU. If you are interested in Power System studies, you are welcome to join the following two events, 1. SEL is hosting an information session for students on Tuesday (21/09) at 6:30pm in Montgomery Hall Room 331. 2. Mike Collum who is an alumni of Mississippi State will be presenting power system relaying topics in our Power Transmission System class on Wednesday morning 10:00 AM (22/09). The classroom is Simrall Hall - Room 102. Thanks. Yong ==================================================== Yong Fu, Ph.D. Assistant Professor Department of Electrical and Computer Engineering Mississippi State University Room 239 Simrall Bldg. 406 Hardy Rd., P.O. Box 9571 Mississippi State, MS 39762 Phone: 662-325-3878 Fax: 662-325-2298 Homepage: http://www.ece.msstate.edu/~fu ==================================================== -------------- next part -------------- A non-text attachment was scrubbed... Name: Mississippi State Info Session.pdf Type: application/pdf Size: 54584 bytes Desc: not available Url : http://www.ece.msstate.edu/pipermail/ece4643/attachments/20100917/36aff3c9/MississippiStateInfoSession-0001.pdf From fu at ece.msstate.edu Sun Sep 19 21:54:37 2010 From: fu at ece.msstate.edu (Yong Fu) Date: Sun Sep 19 21:54:47 2010 Subject: [ece4643] Re: Power Relaying HW4 #2 In-Reply-To: Message-ID: <20782232.134881284951277302.JavaMail.root@zimbra.ece.msstate.edu> All, I updated HW4. Please download it from our class website. Thanks. Yong ==================================================== Yong Fu, Ph.D. Assistant Professor Department of Electrical and Computer Engineering Mississippi State University Room 239 Simrall Bldg. 406 Hardy Rd., P.O. Box 9571 Mississippi State, MS 39762 Phone: 662-325-3878 Fax: 662-325-2298 Homepage: http://www.ece.msstate.edu/~fu ==================================================== ----- Original Message ----- From: "Ronald Repsher" To: "Yong Fu" Sent: Sunday, September 19, 2010 8:38:26 PM GMT -06:00 US/Canada Central Subject: Power Relaying HW4 #2 Dr. Fu, I was working the homework #4 and I noticed that there is some information missing on question #2. It refers to a Figure 3.6. That figure is not included on the download from our class website. Can you include this figure? Thank you Ronnie Repsher From fu at ece.msstate.edu Wed Sep 22 14:24:38 2010 From: fu at ece.msstate.edu (Yong Fu) Date: Wed Sep 22 14:24:48 2010 Subject: [ece4643] about today's homework Message-ID: <3980867.145041285183478656.JavaMail.root@zimbra.ece.msstate.edu> All, I uploaded today?s Homework 5 on our class website. This new problem is similar to our example in the class. The due day is Next Wednesday. Thank you for attending today?s SEL presentation. Yong ==================================================== Yong Fu, Ph.D. Assistant Professor Department of Electrical and Computer Engineering Mississippi State University Room 239 Simrall Bldg. 406 Hardy Rd., P.O. Box 9571 Mississippi State, MS 39762 Phone: 662-325-3878 Fax: 662-325-2298 Homepage: http://www.ece.msstate.edu/~fu ==================================================== From fu at ece.msstate.edu Mon Sep 27 13:21:07 2010 From: fu at ece.msstate.edu (Yong Fu) Date: Mon Sep 27 13:21:18 2010 Subject: [ece4643-501] [ece4643] about today's homework In-Reply-To: <18957235.156981285611395885.JavaMail.root@zimbra.ece.msstate.edu> Message-ID: <15563573.157001285611667895.JavaMail.root@zimbra.ece.msstate.edu> John, You are right. That means (2)(4.5MVA) or 9MVA. Thanks. Yong ==================================================== Yong Fu, Ph.D. Assistant Professor Department of Electrical and Computer Engineering Mississippi State University Room 239 Simrall Bldg. 406 Hardy Rd., P.O. Box 9571 Mississippi State, MS 39762 Phone: 662-325-3878 Fax: 662-325-2298 Homepage: http://www.ece.msstate.edu/~fu ==================================================== ----- Original Message ----- From: "John Mansell" To: "Yong Fu" Sent: Monday, September 27, 2010 11:55:31 AM GMT -06:00 US/Canada Central Subject: Re: [ece4643-501] [ece4643] about today's homework Dr. Fu, For homework 5, what is meant by "use the twice maximum load current"? Is this meaning to use (2)(4.5MVA) or 9MVA to select the secondary pick up current for each time-delay overcurrent relay? Sincerely, John Mansell On Wed, Sep 22, 2010 at 2:24 PM, Yong Fu < fu@ece.msstate.edu > wrote: All, I uploaded today?s Homework 5 on our class website. This new problem is similar to our example in the class. The due day is Next Wednesday. Thank you for attending today?s SEL presentation. Yong ==================================================== Yong Fu, Ph.D. Assistant Professor Department of Electrical and Computer Engineering Mississippi State University Room 239 Simrall Bldg. 406 Hardy Rd., P.O. Box 9571 Mississippi State, MS 39762 Phone: 662-325-3878 Fax: 662-325-2298 Homepage: http://www.ece.msstate.edu/~fu ==================================================== _______________________________________________ ece4643 mailing list ece4643@ece.msstate.edu http://www.ece.msstate.edu/mailman/listinfo/ece4643 _______________________________________________ ece4643-501 mailing list ece4643-501@ece.msstate.edu http://www.ece.msstate.edu/mailman/listinfo/ece4643-501 From fu at ece.msstate.edu Wed Sep 29 13:30:52 2010 From: fu at ece.msstate.edu (Yong Fu) Date: Wed Sep 29 13:31:04 2010 Subject: [ece4643] Re: Questions about HW#5 In-Reply-To: <7674666.162611285784078934.JavaMail.root@zimbra.ece.msstate.edu> Message-ID: <24740581.162631285785052889.JavaMail.root@zimbra.ece.msstate.edu> About your questions, Ex. You calculated the time delay for relay #3 like this: 1. I3' fault/Ip3 = 2000/ (200/5) / 3 =16.7 (where is this 2000A coming from? Is this the max fault current seen by relay #3? I only had a minimum current in my notes....) A: We are using the maximum fault current to determine the time dial setting. Here, your concern is which value is maximum fault current through R3. When there is a three-balanced fault just behind R3 (at its right side), we get the maximum fault current which is very close to the maximum fault current at bus 2 (the relay 3 is at the right side of Bus 2). So, we select 2000A which is the maximum fault at bus 2. 2. Select Td3= ? (Where is this ? coming from?) A. The relay R3 is at the end of this system. So, we want it to clear the fault as quickly as possible. Here, ? is the lowest time dial setting on the figure. Let us select this value for R3. Please use the same selection for our homework. Lastly, you factored in the Breaker op time with the time delay like this: Clear r3= 0.05+0.083=0.133 s (Where is this 0.05 coming from? I understand that the 0.083 is the breaker op time, but not the 0.05....) A. Once your get p.u secondary fault current 16.7 and Td3=1/2, you can check the figure to get the operating time of R3 is 0.05 seconds. Then, the total time for clearing the fault is 0.05+0.083=0.133 s. Thanks. ==================================================== Yong Fu, Ph.D. Assistant Professor Department of Electrical and Computer Engineering Mississippi State University Room 239 Simrall Bldg. 406 Hardy Rd., P.O. Box 9571 Mississippi State, MS 39762 Phone: 662-325-3878 Fax: 662-325-2298 Homepage: http://www.ece.msstate.edu/~fu ==================================================== ----- Original Message ----- From: "Hansel Adrian Beckford" To: "Yong Fu" Sent: Wednesday, September 29, 2010 7:53:25 AM GMT -06:00 US/Canada Central Subject: Questions about HW#5 Dr. Fu: I am trying to attempt this Hw #5 and I had some questions: 1) When calculating the time delay for each relay, what was the level of fault current that you used in addition to factoring in the CT Ratio? Was it maximum or minimum fault current? The numbers in the example you did in class did not make sense to me. Ex. You calculated the time delay for relay #3 like this: I3' fault/Ip3 = 2000/ (200/5) / 3 =16.7 (where is this 2000A coming from? Is this the max fault current seen by relay #3? I only had a minimum current in my notes....) Select Td3= ? (Where is this ? coming from?) Lastly, you factored in the Breaker op time with the time delay like this: Clear r3= 0.05+0.083=0.133 s (Where is this 0.05 coming from? I understand that the 0.083 is the breaker op time, but not the 0.05....) Please respond as soon as you get this bc I would like to complete the assignment and sent it to you today. Hansel Beckford, Jr. (Hans) Protection & Control Applications Engineer Southern Company Transmission BIN 50061 62 Lake Mirror Rd, Bldg 6, Forest Park, GA 30297 Linc: 1*20*20051 Linc tel: (404) 717-0208 Internal: 8-608-5587 From fu at ece.msstate.edu Thu Sep 30 13:55:15 2010 From: fu at ece.msstate.edu (Yong Fu) Date: Thu Sep 30 13:55:26 2010 Subject: [ece4643] about Homework 6 Message-ID: <16106137.166711285872915525.JavaMail.root@zimbra.ece.msstate.edu> Dear All, I uploaded Homework 6 on our Class website. Thanks. Yong ==================================================== Yong Fu, Ph.D. Assistant Professor Department of Electrical and Computer Engineering Mississippi State University Room 239 Simrall Bldg. 406 Hardy Rd., P.O. Box 9571 Mississippi State, MS 39762 Phone: 662-325-3878 Fax: 662-325-2298 Homepage: http://www.ece.msstate.edu/~fu ====================================================