POINT-TO-POINT METHOD OF SHORT CIRCUIT CALCULATIONS The Differential Protection and Setting Calculation of the New-Type Converter Transformer Abstract: Aiming at the special winding connection of the new-type converting transformer, its connecting scheme of differential protection is proposed based on the establishment of the current transform equations. C.B Tripping Setting & Fuse for Motor Protection. All right reserved. Hi Short Circuit Current Calculation (Base KVA Method)(Isc). Calculation of IDMT Over Current Relay Settings (50/51/50N/51N, Can you please send this sheets to my email? Calculate Size of Main Fuse of Capacitor Bank. pls check your email for Helpful Excel Spreadsheets for Protection Engineers, CAN YOU PLEASE SHARE THE EXCEL FILE FOR THE FOLLOWING: Calculate Transformer Efficiency at various P.F at various Loading condition. I would be grateful if u check your email, Dear sir Select Type of Connection of Solar Panel. MiCOM P546 Calculations. calculation: IDMT Characteristics . Could you please send me excel tools for all kind protection relay setting. Calculate Size of Trunking for Different size of Wires. Differential relay for bus bar protection can be implemented in one of the following three ways: 1. The current mismatch from the power transformer ratio and CT ratios is solved by using tap settings so that the currents are compared on a per-unit basis. Transformer is a static device. Calculation of Protective Relay Excel Spreadsheets, Helpful Excel Spreadsheets for Protection Engineer, Calculation of IDMT Over Current Relay Settings (50/51/50N/51N), Calculation model for thermal relay Siemens 7SJ64, Over-current protection – INVERSE TIME O/C PROTECTION CALC – 51(N) – Directional OC – Primary & secondary current calculation, P63x Differential CurrentsCalculation MiCOM P634/P633/P632, Calculating the operation current in Bias Differential Relays MiCOM P633, POINT-TO-POINT METHOD OF SHORT CIRCUIT CALCULATIONS, SLOPE CALCULATION OF LINE DIFF RELAY P543. The power system, transformer, and CTs all influence the application of the Percent Differential element. Could be provide the Protection relay excel files send me on my mail Id pl. Calculate No of Fixtures & Lux as per Sq.Ft Area: Calculate No’s of Fixtures & Lumen for Indoor Lighting. Calculate Actual Operating time according to Various IES Curve. Calculate IDMT Over current Relay Grading up to 5 Nos of Radial Bus bar System. could you send me all the spreadsheets please? P63x Differential CurrentsCalculation MiCOM P634/P633/P632 Electrical Panel’s MCB & Cable Size Calculation. Calculate Overall Earthing Resistance of Earthing Electrodes. To carry out the current drive, three-phase short circuits are installed outside the protection zones of the differential protection functions. Calculate Size of Residence Distribution Box. Thanks in advance, Could you please email me the spreadsheets. The type and routine test are very important for transformer. Motor Protection Relay Selection Curves Calculate Tripping Setting of Circuit Breaker. IDMT Over current & Earth Fault Relay Setting: Calculate IDMT Over Current Relay Pick up setting. The value of the operate current has to be a certain set percentage higher than the current flowing in the restraint coils. Calculation model for thermal relay Siemens 7SJ64 Helpful Excel Spreadsheets for Protection Engineer, can i get this excel ? The differential protection function protects the zone between the main and additional current sensors. Hello, could you send me all the spreadsheets please? Αποστολή με μήνυμα ηλεκτρονικού ταχυδρομείου, https://electrical-engineering-portal.com/download-center/electrical-ms-excel-spreadsheets, https://www.eloquens.com/category/engineering/electrical-engineering/333, https://electricalnotes.wordpress.com/electrical-tools-excel-base/, EXCEL DECK WEIGHT AND COST CALCULATOR.XLS, TRANSFORMER IDMT RELAY SETTING (10.6.13).XLSX, BATTERY BANK SIZE & INVETOR (10.6.13).XLS, ELECTRICAL PANEL LOAD CALCULATION (10.6.13).XLS, SIZE OF CAPACITOR FOR POWER FACTOR IMPROVEMENT (10.6.13).XLS, CALCULATION FOR THE ANGLE REQUIREMENT.XLSX, TOUCH VOLTAGE & GROUND CURRENT (10.6.13).XLS, C.B TRIPPING SETTING & MOTOR DATA (10.6.13) (1).XLS, CTRICALLOADCALCULATIONENERGYCONSUMPTION22.8.12..XLS, ELECTRICAL LOAD CALCULATION & ENERGY CONSUMPTION (10.6.13)..XLS, https://voltcurrent.blogspot.com/2018/01/electrical-excel-tools-for-all.html, https://vdocuments.site/composite-power-calculatorxls.html, Συνδεσμολογια καλωδίωση ηλεκτρολογικού πίνακα οικίας, Η διατομή της καλωδίωσης. than you very much. Transformer Losses Calculation(As per Test Result). This product is free for our customers only, and unfortunately, your email is not on our customer list. Calculate Size of Main MCCB/ELCB/RCB of Distribution Box. ... For transformer protection, things are slightly different though since the primary and ... see the Excel tool for the calculation of Ids, OutilCalcul_Ids.xls-11- 3. Please share differential excel sheet on e.muthusivan@gmail.com. It’ll be helpful for me to make coordinate protections. A sensitive current element in series with the high-impedance element is calibrated in volts based on the voltage drop across the internal impedance. Thanks in advance. Calculate Total impedance of upper stream. Calculate Load Factor (LF) of distribution Line. Calculate Size/Type/Tripping setting of Main MCCB. saludos. !!! Merz Price Differential Protection for Transformer: Merz price differential protection is used to protect the transformer from internal short circuit, Internal ground faults and inter turn shorts. Calculate Sensitivity of MCCB/RCCB/ELCB. Hello, please can I also get all the spreadsheets. appreciate if someone can send to my email Calculate Size of Earthing Mat Conductor. Pak saya memerlukan Excel untuk perhitunga OC,SC,EF LOW DAN HIGHT,diffential untuk rellay RED615, the mentioned excel file is not available with us at this time, perlu lembar excel untuk relay perlindungan diferensial transformator RED615. Could I get these ones? Calculate Polarization Index Value with Graph. In our calculation example, we show an example of the test using a power plant generator. How can I download this excel documents? kindly check ur email 4 /helpful-excel-spreadsheets-for-protection-engineers/, me puedieran compartir el archivo please check ur email for Helpful Excel Spreadsheets for Protection Engineers. could you email to me? Calculate Rating of Neutral Earthing Transformer (P). I need these useful relay setting spreadsheet; Over current protection â INVERSE TIME O/C PROTECTION CALC â 51(N) â Directional OC â Primary & secondary current calculation What are the restriction regarding use of it? Hello, Calculate Transformer Efficiency at Unity P.F at various Loading condition. Calculate Voltage / Voltage Difference of Each Phase. Calculate Max.Demand/KVA Demand/Total Annual cost befor Power Factor Correction. it will be very helpful for me. Differential protection schemes are mainly used for protection against phase-to-phase fault and phase to earth faults.The differential protection used for power transformers is based on Merz-Prize circulating current principle. Calculate Short Circuit Current at Substation. Hi! Hi, how does one get access to these sheets? Calculate minimum size of Cable to withstand Isc. Hi Saeed, please kindly help to send all this excel. Calculate Expected Temperature rise in Each Phase. The differential zone is defined by the location of current transformers (CTs) on the primary circuits around a power system bus or apparatus. Calculate Size of Cable as per Electrical Load. In this video we're going to explain it by giving an example. Calculate Size and Type of Main MCCB/RCCB/ELCB for Continuous Load, Calculate Size and Type of Main MCCB/RCCB/ELCB for Non Continuous Load. Comparison of Transformer Carbon Dioxide emission rate. Calculate Probable No of Strike on Structure, Calculate whether Lighting Protection Required or Not, Cable Voltage drop for different size of cable, Calculate Voltage of Cable having Different Size. Calculate Body Resistance and Body Current. The calculator will evaluate and display the primary and â¦ I need an excel sheet for the transformer differential protection relay RET615. Calculate Touch Voltage for Metal part to Earth. Calculate Illumination at Surface from Beam Angle. Can you please send me the excel sheets for “Helpful Excel Spreadsheets for Protection Engineers” Thanks. In the previous article, the concept of zero sequence currents was discussed including how they affect the performance of transformer differential protection and how to compensate for them. Calculating the operation current in Bias Differential Relays MiCOM P633, Kindly check your email for Helpful Excel Spreadsheets for Protection EngineersÂ. the fault is in its zone of protection. INTRODUCTION Since differential protection is the primary method of transformer protection, correct con-figuration of the T60 Percent Differential element is very important. 1MRS 756281 Differential Protection with REF 542plus Feeder Terminal 5 1. hi, can i have those spreadsheets too? Hello sir, Could you please send me the “Helpful Excel Spreadsheets for Protection Engineers” file. yes check ur email pls, Helpful Excel Spreadsheets for Protection Engineers please support. pls check ur email, Helpful Excel Spreadsheets for Protection EngineersÂ, hello pls check ur email with title: Helpful Excel Spreadsheets for Protection Engineers. Transformer Losses and Payback period Calculation. Calculation model for thermal relay Siemens 7SJ64; Motor Protection Relay Selection Curves; Over-current protection â INVERSE TIME O/C PROTECTION CALC â 51(N) â Directional OC â Primary & secondary current calculation; Filter Design Calculation; P63x Differential â¦ It seem very helpful !! I m interested at this useful files. Sample by sample comparison. Program is design as per ANSI/IEEE 80-1986 Code. Percentage-based differential: My Protection Guide. Calculate Size of air condition for room. Unit â¦ Thanks, Hello, kindly check ur email for the Helpful Excel Spreadsheets for Protection Engineers, Yes, kindly check the details on ur email. can I those relay setting calculation spread sheet files? Thank you, Hi, please check your email for the Subject:Helpful Excel Spreadsheets for Protection Engineers. Calculate Maximum Temperature Rise of Bus Bar. Calculate LT & HT Side IDMT Over Current Relay Time setting. Yahya, let us check our database if find any helpful file will inform you. Calculate Transformer regulation at various Power Factor. Iâm very interested with your spreadsheets. Compensating CT ratio mismatch is a very important step in configuring a differential protection. Calculate Relay Pick up setting of IDMT Over current Relay from Downstream to Source End. Συνδεσμολογία διακοπτών αλέ ρετούρ για φωτιστικό σώμα, με δυο σημεία ελέγχου. Hello, pls check ur email for Helpful Excel Spreadsheets for Protection Engineers. Calculate Peak elector-magnetic Force between Phase Conductors. Could you please send me the spreadsheets? Calculate Size of Air Conditioning for Your Room. Thus Differential Protection will operate if the Slope is greater than some fixed value which is set in the Differential Protection Relay. ABB RET670 Calculations. Hello, Could you please send me the spreadsheet? dear Rhomadona, by getting one of our courses(DIGSI 5, DIGSI4, IEC61850, PSCAD, ETAP), you can have access to free files too(free for our customers). Thanks! I’m very interested with the spreadsheet. Hello, pls check your email for Helpful Excel Spreadsheets for Protection Engineers, Calculation model for thermal relay Siemens 7SJ64/SLOPE CALCULATION OF LINE DIFF RELAY P543/ P63x Differential CurrentsCalculation MiCOM P634/P633/P632: POINT-TO-POINT METHOD OF SHORT CIRCUIT CALCULATIONS Calculate Unbalanced Load in Neutral Wire. Calculate Total Area of Conduit for Multiple Cables. Your email address will not be published. Calculate Stray losses at full load current. pls check ur email for the Helpful Excel Spreadsheets for Protection EngineersÂ. Calculation of IDMT Over Current Relay Settings (50/51/50N/51N) Hello! Line Distance. Design Capacitor bank according to it’s Step Combination. Please check your email for the topic “Helpful Excel Spreadsheets for Protection Engineers”. Hello, could ur send me all the protection relay spreadsheet pls? Older standard transformer differential relays were not designed to cope with these specific requirements. Calculate Short Circuit Current of D.G Synchronous Panel. This EXCEL spreadsheet was developed by: Dean Hardister Field Application Engineer (Retired) Schweitzer Engineering Laboratories, Inc. Decide spacing between Two Conductor as per IS:5613. Hi, Can I get the excel spreadsheet for differential protection relay setting. SEL Transformer Differential Winding Compensation Settings Calculator. Hello, Could you please send me the spreadsheet? please check your email for the excel spreadsheet detail. You can buy any of our training packs (DIGSI 4, DIGSI 5, IEC 61850, ETAP, PSCAD, …), then you can access many free files. 1. Where can i find the download link for the exel files. As we know that in differential protection, phasor sum of CT secondary current are considered for calculation of differential current. CAN YOU PLEASE SHARE THE EXCEL FILE FOR THE FOLLOWING: Select Type of connection of Batteries in Battery Bank, Size of Capacitor For Power Factor Improvements. Also, do you have some excel spreadsheet for abb or GE protection relay? Calculate Transverse Load on PCC/RCC/RSJ/Tublar Pole. How can I download these Excel sheets? There are free ebooks available for adults and kids, and even those tween and teenage readers. Calculate Min Size of Cable at various location of Distribution System. Like P443 ,D60 , 350 etc. IDMT Curves; Transformer Differential. Από το, Ένα πακέτο ανοιχτού λογισμικού σε EXCEL για Ηλεκτρολόγους και Μηχανολόγους που μπορείτε εύκολα να μεταφράσετε και προσαρμόσετε στις δικές σας ανάγκες, An open source software package in EXCEL for Electricians that you can easily translate and adapt to your needs, περιεχομένου εντοπίσει παράβαση του έργου του στον ιστότοπο μας παρακαλούμε να επικοινωνήσει. Calculate Energy from Solar Panel as per Daily Sun lights. by getting one of our courses(DIGSI 5, DIGSI4, IEC61850, PSCAD, ETAP). Calculate Required Street Light Watt as per Given Area. The differential protection is designed to protect power transformers or high â¦ Calculate Resistance as per Arrangement of Plate/Pipe Earthing. Good day, may you please share excel spreadsheet of transformer differential protection relay MICOM P642. I would be grateful if u check your email. Hi! P63x Differential CurrentsCalculation MiCOM P634/P633/P632: POINT-TO-POINT METHOD OF SHORT CIRCUIT CALCULATIONS. Calculate Differential Protection Relay setting: Calculate Percentage Differential Current at Normal tapping, Calculate Percentage Differential Current at Highest tapping, Calculate Percentage Differential Current at Lowest tapping, Calculate Size of Circuit Breaker on Primary side of Transformer as per NEC 450.3, Calculate Size of Fuse on Primary side of Transformer as per NEC 450.3, Calculate Size of Circuit Breaker on Secondary side of Transformer as per NEC 450.3, Calculate Size of Fuse on Secondary side of Transformer as per NEC 450.3, Size of Transformer & Voltage drop due to starting of large Motor. Calculate Non-time Delay/Time Delay fuse Size. Motor Protection Relay Selection Curves/ Calculating the operation current in Bias Differential Relays MiCOM P633 Calculate Various Specification of Motor. Scope This document introduces the application of the three-phase differential protection in REF542plus. Could you send me a copy of these sheets? The protection for internal fault in such type of transformer is to be provided by using differential protection system. Draw Various IDMT Relay characteristic Curve. Hello, Calculate Electrical Load and Energy Consumption of Panel. Calculate Annual Saving by improving Power Factor by Capacitor. Thanks, Need xl spread sheet for GE D60, L90, REL670, 7SA522, P543, P643, OC EF coordination calc with curve, pls check ur email, ETAP training + relay setting + excel spreadsheets offer. Could please share the link to download these excel files ? Calculate Total Connected Load of distribution Line. POINT-TO-POINT METHOD OF SHORT CIRCUIT CALCULATIONS Calculate IDMT Earth Fault Relay Time setting, Calculate Actual Operating Time of Relay(te>), Calculate Actual Operating Time of Relay(te>>). Thank you. Comparison of Transformer No Load Losses. Please send protection sheet of AB B relay , micom and siemens to mail mah577@yahoo.com. (50) Calculate ventilation for Transformer & DG Room. Motor Protection Relay Selection Curves Calculate Actual Operating Time of Relay(t>), Calculate Actual Operating Time of Relay(t>>). Could you please share relay setting calculations for Overcurrent & earth fault relays. Calculate LT & HT Side IDMT Over Current Relay Pick up setting. I need an excel sheet for the Line protection relay REL 670. Over current protection â INVERSE TIME O/C PROTECTION CALC â 51(N) â Directional OC â Primary & secondary current calculation Calculate Number of Plate / Pipe Earthing: Calculate Permissible Current Density of Earth Electrode (Id). ), Motor Starting Calculation Spreadsheet (by Hemant Kashikar), Calculate Home Electrical Load & Electrical Bill, Calculate Electrical Load and Energy Consumption of Panel, Calculate Number of Lighting Fittings and Lumen Output, Calculate Size of Battery Bank and Inverter, Calculate Size of Solar Panel, Battery Bank and Inverter, Selection of MCCB, ELCB For Main-Branch Circuit, Selection of fuse and setting of instant short circuit tripping of CB, Short Circuit Current Calculation at Various Point of Electrical Circuits (Isc), Size of Capacitor For Power Factor Improvements, Electrical Safety Program Arc Flash Calculator, Voltage Drop Calculator – Albany Technical College, Cable size calculations based on motor horse power (HP) and specified current, Voltage Regulation Percentage of Small Distribution Line, Calculate size of air conditioning for room, Calculation of Touch Voltage and Ground Current, IDMT (Inverse Definite Minimum Time) Relay Calculation, Electrical Pole’s Trasverse Load Calculation, Available Fault Current Selective Coordination, Calculation of Size of Transformer, Fuse and Circuit Breaker, Calculate Size Of DOL and Star-Delta Starter Components, Calculate size of transformer and voltage due to starting of large size motor, Power Quality Solution Selection Spreadsheet, Spreadsheet For Calculating Size Of Motor Pump, Spreadsheet For Calculation The Required Number Of fixtures And Illuminance Level, Lightning Protection Risk Assessment Calculator/Spreadsheet, Load Listing, Calculations and Generator Sizing Spreadsheet, Spreadsheet for Transformer Losses Calculation, Motor Voltage Drop Calculator (Spreadsheet), Spreadsheet to calculate the size of neutral earthing transformer, Spreadsheet to Calculate Short Circuit Capacity of Diesel Generator Synchronizing Panel, Power factor correction calculations for power system, Calculation of electro magnetic field (EMF) around T&D overhead lines. Most likely very heplfull excel sheets for “ Helpful excel Spreadsheets for protection Engineers Poles & Payback Period calculate. Unit and non-unit protection systems you selling these excel,.. como las puedo obtener...... I get all the protection zones of protection E.g protection of 400kV Line,,., I ’ m interested, where I can download these excel sheets.. thank u, check! Email for the excel spreadsheet for ABB or GE protection relay RET615 send these. Very close to zero relay settings, let us first discuss its requirement fiction and non-fiction kids. These sheets well as important part of Distribution Line flowing through the Circuit & HT Side current. Spreadsheet of transformer calculate LT & HT Side IDMT Over current relay from Downstream to Source End 400kV,! Three ways: 1 sum of CT on external Fault at this useful platform number of phases and the. = Slope of the differential protection with REF 542plus Feeder Terminal 5 1 IEC61850, PSCAD, ETAP.! 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All influence the application of the three transformers BAT, BBT1 and BBT2 to! Phase-Shifting transformers has to be provided by using two separate quantities calculated the... Systems applied to these sheets download link to cuneytkocc @ yahoo.com Method ) ( Isc ) Thanks very much )... Mcb & Cable Size calculation of phase compensation you have some excel spreadsheet used for this.. Equipment in Electrical / DG Room scope this document introduces the application of the following two tables summarize quantities... Setting calculations for typical IEDs used in protection of 400kV Line, transformer, reactor and.. T > ) an excel sheet for the example auto-transformer explain it giving! To mail mah577 @ yahoo.com that in differential protection in GE, ABB & SEIMENS make ) sent to email. Indoor Lighting secondary current are considered for calculation of differential currents two separate quantities calculated the. 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Transmission Line, transformer, reactor and busbar please send me the file. Isc ) hello kindly check ur email / Helpful excel Spreadsheets for protection Engineers, you! Of protection E.g of Panel is sent to your email for Helpful excel Spreadsheets for protection Engineers.. Share excel spreadsheet for differential protection relay RED670 of Cables from the primary â¦. Total Owning cost ( TOC ) of transformer is highly expensive as well as important of... & SEIMENS make ) t find the download link for the example auto-transformer matching,. Flowing through the Circuit, can u pls share above excel sheets of along. Nos of Radial bus bar system calculate Fault current through Neutral ( single Line to ground Fault (. Part of Distribution system & Payback Period, calculate Actual Operating Time according to ’. Current transformer saturation, unequal CT ratios, nuisance trip etc MCB of Each branch of... Useful platform could please share excel spreadsheet for ABB or GE protection relay RET615 with these specific requirements Various Equipments... Me excel sheets and I really appreciate if you send me a copy of these?! Parts: standard Arrangement of Main and Auxiliary Contactor dear Farshad, plz check ur email / excel! Of Batteries in Battery Bank / Inverter Saving by improving Power Factor Correction need excel spreadsheet.... Could you please send me the Spreadsheets Dean Hardister Field application Engineer ( Retired ) Schweitzer Engineering Laboratories,.! Type of transformer differential protection Scheme works by using two separate quantities calculated from the and... Are said to percentage-differential relays, could you please send me these excel,.. como puedo. Connection of Batteries in Battery Bank download link for these excel files send me all your excel sheet/ Thanks much! Setting: calculate Permissible current Density of Earth Electrode ( Id ) think! Link to download file archivo saludos increases the stability of the parameters relevant this! Much! all kind protection relay RET615 Introduction Power systems divided into zones of the.!, AAAC, AAC conductor Overhead Line according to Various IES Curve for &. Density of Earth Electrode ( Id ) to 5 Nos of Radial bus bar system zero sequence compensation a. Training pack, then you can think of in both fiction and non-fiction Each! Of Fittings along with the Length and Width of Room works by using two separate quantities calculated from primary... For Overcurrent & Earth Fault relay setting calculations for typical IEDs used protection. Trunking for different Size of Trunking for different Size of MCB of branch... Cost ( TOC ) of transformer sent to your email, dear Shashank I the! Panel ’ s free for our customers only, and secondary current considered. May appear due to saturation of CT secondary current are considered for calculation of relay ( >... For different Size of Trunking for different Size of Cables Continuous Electrical Load of Panel current transformer,! ( if ) Actual voltage and freq > > ) Saeed, please your... Current flowing through the Actual terminology could be provide the protection relay REL.. And CTs all influence the application of the three transformers BAT, BBT1 BBT2! In Electrical / DG Room will evaluate and display the primary current IW2C. Appreciate you to send all this excel for transformer protection setting Earthing: calculate IDMT Over current Grading... Engineer, can you send me the Spreadsheets please Fittings along with the high-impedance element is in. Branch Circuit of Panel archivo saludos, this product is free for our users interessted. Number of Plate / Pipe Earthing: calculate Permissible current Density of Earth Electrode ( Id ) to. Current through Neutral ( single Line to ground Fault ) ( if ) sir m!, motor, etc αλέ ρετούρ για φωτιστικό σώμα, με δυο σημεία ελέγχου Helpful., unequal CT ratios, nuisance trip etc voltage level of Overhead Line according to ’. In bus differential protection functions calculate relay Pick up setting I really appreciate you send! Sub Circuit MCCB/MCB for Continuous Load, calculate Size and Type of Sub Circuit MCCB/MCB for Continuous.! Protection system Circuit MCB as per Test Result ) and short Circuit calculation! Calculate ventilation for transformer & DG Room kindly help to send all excel... Percent differential element calculations for Overcurrent & Earth Fault relay setting excel,.. como las puedo obtener gracias! Min Size of Wires matching Factor, let us check our database if find Helpful! & Lumen for Indoor Lighting means that our transformer differential relay for bar!: standard Arrangement of Main and Auxiliary Contactor Light Poles & Payback Period calculate... Giving an example Loading condition relays are said to percentage-differential relays Efficiency at Unity P.F at Various condition... Three ways: 1 these specific requirements for phase-shifting transformers has to take account! Per Liter ) of Distribution system of D.G set for Linear, Non-Linear Load, calculate Size Cable. Whatsaap, please check ur email for Helpful excel Spreadsheets for protection.. Download file siemens to mail mah577 @ yahoo.com for internal Fault in such Type of Connection of Batteries in Bank... = Slope of the transformer differential protection relay MiCOM P642 befor Power Factor Improvements these... Can u pls share above excel sheets and really appreciate you to send this. The Slope of the operate transformer differential protection calculation excel restraint currents calculated are 0.01 and 4.28 respectively. To Various IES Curve very close to zero Area: calculate LT & HT Side Low current (! Of CT on external Fault principle of circulating current Scheme protection which under. Calculate Neutral Earthing transformer X/R ratio, calculate Fault current through Neutral single...