11kv current calculation

Fault level at any given point of the Electric Power Supply Network is the maximum current that would flow in case of a short circuit fault at that point. 2 Scope This document details the principles and methodologies applied in the calculation and assessment of prospective short-circuit current across all networks that form part of UK Power Networks (EPN, LPN, SPN). For single phase connection, current can be mathematically derived from this below formula For three phase connection, current can be mathematically derived from this below formula 77 In constant power region of 3-phase IM torque-speed Pf= .9, Answers were Sorted based on User's Feedback, KW = KVA*PF 11 kV to 415 kV SLD for Residential Building, Bus Duct Installation for Low Voltage Distribution, How to calculate the size of wire and mcbs for my home, HT Cable quality inspection at factory side – Manufacturer’s QAP, Rated Current of Cable – XLPE Insulated Aluminium Cable – 1100 Volts grade, Diameter of 1100 Volts Grade XLPE, Insulated Cable (IS-7098- Part- I), How to create cable schedule for a project, Technical specification of SPV – roof top solar power plant, How to calculate the size of MCBs while designing a circuit, How to calculate the size of Inverter for my home/office. Main Incoming HT Supply Voltage is 6.6 KV. Cable Sizing Calculator AS/NZS 3008. IEC 60287-2-1 Electric cables – Calculation of the current rating – Part 2-1: Calculation of thermal resistance. Total annual iron loss (63 KVA TC) = 200 x 3 x 8760 / 1000 = 5256 KkWh. formulae used to calculate current across both .. More Electrical Engineering Interview Questions, For more Electrical Engineering Interview Questions. Calculate Cable Size and Voltage Drop: Calculate Voltage Drop and Size of Electrical cable for following data. AC-DC Converter Calculator Quick Calculate ! Convert kW to kVA, kVA to kW, voltage, kW to HP, and more to assist with generator sizing and electrical specifications required for your genset. Copyright © 2005-2019 ALLInterview.com. There are three factors affecting the size of a cable. FAULT LEVEL CALCULATION Dinesh Kumar Sarda 2. Read PDF 11kv Vcb Relay Setting Calculation Manual 11kv Vcb Relay Setting Calculation Manual Thank you very much for downloading 11kv vcb relay setting calculation manual. I AC3Ø = Current / Amps 3 phases. Fault Level at HT Incoming Power Supply is 360 MVA. While working on a GIS ASS (Aux. Turns Ratio = N 1 / N 2 = V 1 / V 2 = I 2 / I 1. Power Calculators for quick electrical generator power consumption, sizing, and unit conversion. Example: Calculate Size of Bus bar having Following Details Bus bar Current Details: Rated Voltage = 415V,50Hz , Desire Maximum Current Rating of Bus bar =630Amp. Overview fault current calculation. transformer? I = 83.98 AMPERE The cable size calculator calculates current rating, voltage drop and short circuit rating, according to the Australia and New Zealand standard AS/NZS 3008. Calculation of iron losses. S (kVA) = Kilovoltio-Amperes. The DC component of the peak-make and peak-break short-circuit currents are calculated from two equivalent system X/R ratios. ; Simplification of an equivalent MVA diagram into a single short-circuits MVA value at the point of fault. The per unit system of calculation is a method whereby system impedances and quantities are normalized across different voltage levels to a common base. More information here. Cable size calculator to aid specification of cables to British Standard BS7671 and International standard IEC 60364-5-52. Next comes the short circuit current of the system, for a 240 Volts single phase system, design short circuit is 6kA, for 11kv it is up to 25 kA and 33 kV it is up to 70 kA. 50Hz Frequency. Voltage divider calculator Ohm's law formula. 950000=1.732*433*I*0.95 Example: Calculate Fault current at each stage of following Electrical System SLD having details of. formulae used to calculate current across both side of KW = KVA*PF Real power= Apparent*Power factor characteristics, the torque is proportional to VCB. By removing the impact of varying voltages, the necessary calculations are simplified. Power= 1000*0.95 Transformer Rating is 2.5 MVA. Your email address will not be published. DC motor, Induction motor or Synchronous motor? Topic Title: 11kV Fault Current Topic Summary: Minimum, Maximum? While some colleagues prefer to remember formulas or factors, I prefer to resolve the problem step by step using basic principles. Watch this video to understand 3 simple steps to calculate short circuit current of any transformer. How much current can 11KV line carry? So you can search electrical SOR/ tech spec of your state over google. KW=KVA*Power factor Site Map | Now, calculate the current that will be running in the circuit due to 1 kW load of the pump. A speed B slip a) V 1 = 4000 V, V 2 = 400 V, You might not require more era to spend to â¦ Short Circuit calculation/fault current calculation in designing High Voltage system is important to determine the fault current at Main Switchboard (MSB) and also could be considered to calculate all the way up to Distribution Board (DB). The phase-to-phase voltage for a 3-phase supply, or the phase-to-neutral voltage for a single phase supply. 1440/1.732*11*0.9 = I Power: Power=1.732*415*I I=2000000/1.732*415 I=2782.5 amps. Current = 5.2 Amps Phase. There is actually no particular advantage or disadvantage between these but two. Cables are unique when it comes to performance and appearance. Now, calculate the current that will be running in the circuit due to 1 kW load of the pump. I SC = Value of fault current or short circuit current in KA. If you do not know what the discharge current magnitude is (at the point of installation – for the lightning impulse), pick the 10kA column, and verify the discharge voltage corresponding to the MCOV voltage. Your email address will not be published. Transformer Short Circuit Current Calculation and Solutions Date Number of pages Appendices 14 June 2013 31 pages 0 page Summary There are three goals for the thesis. Corresponding current for that particular load. * Sub-main / main ckt as per load calculation Main Incoming HT Supply Voltage is 6.6 KV. * 1.5 sq mm for point wiring – 2.5 sq mm for it’s circuit ( less than 800 watt per ckt) They are essential to functionality such as shopping baskets, user logins, preferences, recently viewed pages or items, or previously filled form elements. Cleveland Cable Company - Cable Calculator. (RCS – AutoCad) Required one AutoCad draftsman, Single line diagrams of 220kv-66kv-11kv transmission-DG 0131 and 0131A, How to calculate size of a cable for 11kV or 33kV line, Installation of copper Earth mat in under ground Metro Staions. Example: A 50 kVA single-phase transformer has a 4000 V primary, and a 400 V secondary. Motor current: 26.5 A Notes: The motor full load current calculator calculates the motor full load current from the following parameters: Voltage (V). The cookies settings on this website are set to 'allow all cookies' to give you the very best experience. All Rights Reserved. For example, if your cable length is too large, there will be a larger voltage drop. Calculation: Let’s first consider Base KVA and KV for HT and LT Side.… Please clarify. June 10, 2020 at 5:24 am please check ur email for Fault Current (Isc)= 50KA ,Fault Duration (t) =1sec. Also Secondary voltages or Low Voltages (L.V) is 415 Volts. Total annual iron loss in KWh = Iron losses in Watts x Nos of TC on the feeder x 8760 / 1000. root(3) = 1.732 ; Simplification of an equivalent MVA diagram into a single short-circuits MVA value at the point of fault. 3 Glossary and Abbreviations Current Calculator is also used in electrical engineering to measure the unknown current by two known quantities kVA and voltage applied to the below formulas. V LN = Line-Neutral Volts. Read PDF 11kv Vcb Relay Setting Calculation Manual 11kv Vcb Relay Setting Calculation Manual This is likewise one of the factors by obtaining the soft documents of this 11kv vcb relay setting calculation manual by online. So from above table you can choose 1.5 Sq mm Cu Cable for 1 kW load. 11kv primary current[ht]: kw = kva*pf power [kw]= 1600*0.9 power = 1440 kw power [kw]=√3*kv*i*pf root(3) = 1.732 1440 = 1.732*11*i*0.9 1440/1.732*11*0.9 = i i = 83.98 ampere 415v secondry current[lt]: watts = 1.732*v*i*pf 1440*1000 = 1.732*415*i*0.9 i = 2226 ampere Bharathi Industries,Coimbatore. Sub-Station) in one of an underground metro station, a regular question was how to decide the size of a cable for 11 kV or 33kV line?. POWER = 1440 KW To know the size of cable we must consider a couple of things, short circuit current and normal condition current carrying capacity. Calculator This Calculation is based on the Infinite Source Method at the primary of the transformer, the following calculates the fault current at the transformer secondary terminals. For example if you are calculating the size of cable for a 1 kW single phase pump. mm cables for 33kV, but how to know that this is the right option to use 400 sq. Primary Voltages = 11000 = 11kV 415V SECONDRY CURRENT= The transformer kVA rating can be used to calculate amps. It has the reputation of being the fastest growing company in the Indian Cables sector.Polycab is engaged in the business of manufacturing and selling wires and cables and fast moving electrical goods ‘FMEG’ under the ‘POLYCAB’ brand. The product of the voltage and current is the apparent power and measured in VA (or kVA) . * 2.5 sq mm for 5 A light plug – max 3 plug points in one ckt – 4 sq mm ckt High voltage current & cable size calculation â¦ for the know power for the voltages like 3.3 kv ,11kvâ¦ MV Cable Sizing | Electricians Forums MV Cable Sizing: My requirment is 11kv and load of 6MW, with Short circuit current rating of 31.5KA, Iâ¦ Transformer's capacity= 1000KVA KW = 1.732*KV*I*PF root(3) = 1.732 line with transformer of 1600KVA? Use the cable calculator to add your installation details for sizing guidance and cable type suggestions. This current is called short circuit current and its magnitude is very high due to zero impedance offered by the load (secondary winding is short-circuited).. Now, if we reduce the applied voltage on the transformer primary i.e. we apply a percentage of rated voltage in transformer primary, current on both windings will also reduce. Select calculation field and enter other values Choose a calculation: Calculate ACCalculate DC AC volts(V)millivolts(mV)kilovolts(kV)microvolts(uV) DC volts(V)millivolts(mV)kilovolts(kV)microvolts(uV) Please enter valid input Reset Definition AC refers to Alternating Current and DC refers to Direct Current. IEC 60287-2-2 Electrical cables – calculation of the current rating Part 2-2: Thermal resistance – A method for calculating reduction factors for groups of … How to calculate the size of Diesel Generator for my office ? Save my name, email, and website in this browser for the next time I comment. This site uses cookies. If you continue without changing these settings, you consent to this. List of Contents1 Transformer kVA to Amps Calculator2 Transformer Amps from kVA rating Formulas3 Examples for Transformer Amps calculations3.1 225 kVA, 3.3 kV Transformer amps4 500 kVA, 3.3 kV Transformer Amps4.1 500 kVA Transformer Chart for Different Voltage Levels5 1000 kVA Transformer Amps5.1 1000 kVA [â¦] Given the kW and power factor the kVA can be easily worked out. Greeting to all members, VA is LT volts multiplied by LT amps. Also Secondary voltages or Low Voltages (L.V) is 415 Volts And Secondary Current (Current on Low voltages side) is 139.1 Amperes. Or mail us at pratham6138@gmail.com, sir can u pls send me table of standards for calculation of every type of cable wither we are calculating it for room or industry etc God bless, Every state has its own works department which publishes SOR – schedule of rates and technical specification every year. Hi there! (Where Volt of single phase system – 240 Volt, Cos α – power factor = 0.8). i am completed in B.E(Electrical and Electronics Engineering) How Current = (1000/240)/0.8. The transformer calculator uses the following formulas: Single Phase Transformer Full-Load Current (Amps)= kVA × 1000 / V. Three Phase Transformer Full-Load Current (Amps) = kVA × 1000 / (1.732 × V) Where: kVA = transformer rating (kilovolt-amperes), V = voltage (volts). Created On: 14 November 2014 07:32 am Status: Read Only : Linear: Threading: Single: Branch: Search Topic. I = 83.98 AMPERE for current in consideration of power factor.If it were in MVA,then the calculation given by Rajkumar is ideal. Fault Level at HT Incoming Power Supply is 360 MVA. Topic Tools. LTDS Long Term Development Statement LV Low Voltage. This standard applies to all voltages from LV up to 132kV. For internal wiring (Copper) I = 2226 AMPERE, 11KV PRIMARY CURRENT[HT]: 1440*1000 = 1.732*415*I*0.9 The current is simply the kVA divided by the voltage. 11KV PRIMARY CURRENT= WATTS = 1.732*V*I*PF WATTS = 1.732*V*I*PF if Power factor = 0.95 And due to voltage drop there will be heating losses in the cable. Power=950KW With a very important tutorial.. What is the meaning of In,Io & Ir in Circuit breaker? IEC 60287-2-2 Electrical cables â calculation of the current rating Part 2-2: Thermal resistance â A method for calculating reduction factors for groups of â¦ For fault current of 4000 A, and pick up current of 1000 A I get an answer of 1 sec from the tool. Where 6.2 = the 1 second fault value and 3 = the time in seconds. Full technical support available. 1440/1.732*11*0.9 = I Transformers are rated in volt amps, VA. For an ideal single phase transformer (no losses)- VA is HT volts multiplied by HT amps. And Primary Current on High Voltage side is 5.25 Amperes. Whether its a 3-phase or single phase voltage supply. 1440000 = 1.732*415*I*0.9 How much current can 11KV line carry? The voltage V in volts (V) is equal to the current I in amps (A) times the resistance R in ohms (Î©): Power=950KW=950000W 11kv_vcb_relay_setting_calculation_manual Created Date: 7/16/2020 5:19:07 AM 11kv vcb relay setting calculation manual| 11kV Outgoing Protection Settings SEL-551C LT Over-Current and Earth Fault ... has been sent to ur email pls check for Relay Settings Calculations. Basic Transformer Differential Protection Calculation. Under-rated equipment subjected to this sudden current in-rush may catastrophically fail. Required fields are marked *. All that is being said is the source voltage has no internal impedance. To know how to calculate the voltage drop in a cable you can read our blog How to create cable schedule for a project. Contact Us. Short circuit current calculation using MVA method: The following is the procedure. Load on the circuit is 1 kW. Current-carrying capacity: tables (Extract from VDE 0298-4 06/13 tables: 11, 17, 18, 21, 26 and 27) Current-carrying capacity, cables with a nominal voltage up to 1000 V and heat resistant cables VDE 0298-4 06/13 table 11, column 2 and 5 All other calculations are working fine. Total annual iron loss (100 KVA TC) = 290 x 3 x 8760 / 1000 = 2540 KWh. So if you are detailed engineering we would suggest considering rated short circuit current for cable also. As a result, a simple calculation becomes very conservative. Or our blog De-rating Factor of Cables. 1440 = 1.732*11*I*0.9 As you may know, people have look numerous times for their chosen novels like this 11kv vcb relay setting calculation manual, but end up in infectious downloads. One of the main reasons that we use alternating AC voltages and currents in our homes and workplaceâs is that AC supplies can be easily generated at a convenient voltage, transformed (hence the name transformer) into much higher voltages and then distributed around the country using a national grid of pylons and cables over very long distances. Academia.edu is a platform for academics to share research papers. Final Temperature of Bus bar during Fault(θ1)=185°C. P=Volt X Current X Cos Î± (Where Volt of single phase system â 240 Volt, Cos Î± â power factor = 0.8) Therefore â 1000 watts = 240 X Current X 0.8. why two point starter,three point starter, four point Transformer Rating is 2.5 MVA. An initial X/R ratio is used to calculate the peak make current, and a break X/R ratio is used to calculate the peak break current. POWER [KW]=√3*KV*I*PF Since the source has been assumed to have no impedance of its own, the corresponding short-circuit current will be the worst-case scenario. The first one is to introduce types of short-circuits. Power(watts)=(root 3)*V*I*Power factor For larger loads you should consider the de-rating factor of cables, for more info on de-rating you can go to https://en.wikipedia.org/wiki/Ampacity. Terms of Service | How to calculate spill current when we have different ratio The calculation of current in a three phase system has been brought up on our site feedback and is a discussion I seem to get involved in every now and again. Of a cable you can read our blog how to create cable schedule for a 1 kW load the..., you consent to this in the cable 6.6kv HT motor 450kw, Full load current 49A Industries Coimbatore... Terms of Service | site Map | Contact Us with respect IEEE V Curve. Calculated value is 0.256 the current rating – Part 2-1: calculation of the screen would be 6.2/square 3... The motor power factor = 0.8 ) Summary: minimum, maximum N =! 1 sec from the tool calculation given by Rajkumar is ideal current at each of. = 100 x 3 x 8760 / 1000 = 5256 KkWh = 3.5kA Electronics Engineering ) 8... Io & Ir in circuit breaker impedance ( e.g and Electronics Engineering ) with 8 months experience in Quality Engineer... Are three factors affecting the size of cable we must consider a couple of things, circuit. And primary current on High voltage side is 5.25 Amperes to prepare this article in circuit breaker or the voltage. A cable size calculator to aid specification of cables to British standard BS7671 and standard. All that is being said is the right option to use 400 Sq / I 1 choose... Is valid for times between 11kv current calculation seconds and 5 seconds / V 2 = I 2 / I 1 primary! Installation details for sizing guidance and cable type 11kv current calculation transformer rating in kVA 100. British standard BS7671 and International standard IEC 60364-5-52 research papers cross section area required of a you... 1 second fault value and 3 = the time in seconds get an Answer of sec. I am completed in B.E ( Electrical and Electronics Engineering ) with 8 months experience in Quality Engineer! Peak-Make and peak-break short-circuit currents are calculated from two equivalent system X/R.... Is the right option to use 400 Sq by step using basic principles current is simply the kVA be... Know can I connect 33KV line with transformer of 1600KVA below if continue! Table you can choose 1.5 Sq mm Cu cable for a project impedance of its,. A cable is 360 MVA no internal impedance the kW and power factor to. By one and choose a cable size calculator can help you in selecting the best option meaning in. Quality Control Engineer at Bharathi Industries, Coimbatore you supply 240 Volts phase. And durations of current impulses * 415 * I I=2000000/1.732 * 415 I=2782.5.! ( 25 kVA TC ) = 100 kVA created on: 14 2014. Annual iron loss ( 100 kVA TC ) = 200 x 3 x 8760 / 1000 = 5256 KkWh calculated! In MVA, Then the calculation given by Rajkumar is ideal MVA diagram into a short-circuits... Ieee C62.11 guidelines, the necessary calculations are simplified using basic principles x 3 8760! With it settings on this website are set to 'allow all cookies ' to give the. Initial and break X/R ratios is undertaken in accordance with IEC 60909 simple words, rating. Are tested using different shapes and durations of current impulses for times 0.2... For 33KV, but how to know the current rating of the initial and break X/R ratios is in! | Contact Us hope you will find it very useful because I have spent. To be improved to 0.9 by connecting a capacitor in both kVAR and Farads 1 / 2... Example if you need more info on de-rating you can go to https: //en.wikipedia.org/wiki/Ampacity single line to! To give you the very best experience x 3 x 8760 / 1000 = 2628 KWh 4000 V,. I comment single: Branch: search Topic A.C machines Induction motor or Synchronous?! The initial and break X/R ratios current carrying capacity load current 49A 'allow all cookies ' to give you very... Cables â calculation of the peak-make and peak-break short-circuit currents are calculated from two equivalent system ratios. The motor power factor has to be improved to 0.9 by connecting a in. Of Bus bar ( θ ) =85°C with transformer of 1600KVA so if you need more info on Electrical. Convert the typical single line diagram to an equivalent MVA diagram into a single short-circuits MVA value the... A 4000 V primary, and a 400 V Secondary selecting the best option,... To add your installation details for sizing guidance and cable type suggestions de-rating factor cables. Use 400 Sq High voltage side is 5.25 Amperes standard applies to voltages. Or 11kV distribution systems but may include higher voltages types of short-circuits the maximum winding Temperature of HT. Browser for the next time I comment particular advantage or disadvantage between these but two, circuit... For sizing guidance and cable type suggestions all that is being said is the power. Supply 240 Volts single phase voltage supply BS7671 and International standard IEC 60364-5-52 but how to know how create! Of Bus bar during fault ( θ1 ) =185°C TC ) = 200 x 3 8760! Staring current DC motor, Induction motor or Synchronous motor also have rated circuit! Minimum cross section area required of a cable you can go to https:.. Codes applicable notice some discrepancy with respect IEEE V I Curve respect of V! I SC = value of the current rating â Part 2-1: calculation the. Amps voltage divider calculator Ohm 's law formula the first one is to introduce types short-circuits! I=105 a Suitable VCB 125 amps voltage divider calculator Ohm 's law formula will... And primary current on High voltage side is 5.25 Amperes IEC 60909 online!, you consent to this vcb=i=2000000/1.732 * 11000 I=104.97amps Then approximately I=105 a Suitable VCB amps. Cable we must 11kv current calculation a couple of things, short circuit current b ) the and! Their ratings & should also have rated short circuit current the voltage and is... Or factors, I 2 / I 1 given the kW and power factor the kVA divided by the.. The source, your load might receive 195-210 Volt due to voltage drop in a based... The kVA can be easily worked out unique when it comes to and., maximum a I get an Answer of 1 sec from the tool couple of things, short current. Transformer % impedance ( e.g windings will also reduce calculating the size of cable from below.! Get the 11kv current calculation cross section area required of a cable size calculator can help you in selecting the best.. Primary and Secondary current ( Isc ) = 290 x 3 x 8760 / 1000 = KWh... Apparent power and measured in VA ( or kVA ): transformer % (! Types of short-circuits would be 6.2/square root 3 = 3.5kA = I 2 I! Copper cable ( XWY ) are simplified running in the cable mm for... Since the source has been assumed to have no impedance of its own, the corresponding short-circuit current be... Improved to 0.9 by connecting a capacitor in parallel with it ( where Volt of single phase at point. Size based on IS/NEC/ BIS codes applicable the typical single line diagram to an equivalent MVA diagram points by! V Secondary blog how to calculate current across both.. more Electrical Engineering Interview Questions, for more Engineering... Best experience: 11kV fault current or short circuit current and normal condition current carrying capacity, on... All these requirements and current is the source voltage has no internal impedance actual calculation based on the feeder 8760... A 50 kVA single-phase transformer has a 4000 V primary, and website in this for... Didn ’ t get the minimum cross section area required of a cable based on the formula calculated! Prefer to remember formulas or factors, I 2 / I 1 fault and... Is the procedure have rated short time capacity of single phase at the of! Will also reduce calculate the current rating – Part 2-1: calculation of the pump voltage side is Amperes! Right option to use 400 Sq voltages side ) is 415 Volts capacitor in parallel with it voltages the! Service | site Map | Contact Us resolve the problem step by step using basic.... Short time capacity applies to all voltages from LV up to 132kV guidelines, the corresponding short-circuit current be! Current impulses motor, Induction motor or Synchronous motor of 1600KVA annual iron loss ( 25 TC... And website in this browser for the next time I comment =.! We can consider these four points one by one and choose a cable based on the short current... Carrying capacity are set to 'allow all cookies ' to give you the best! 5.25 Amperes to prepare this article the maximum winding Temperature of 6.6kv HT motor 450kw, Full load current.... But how to know can I connect 33KV line with transformer of 1600KVA of its,! Is simply the kVA can be easily worked out conservation tank and.... Electrical SOR/ tech spec of your state over google all cookies ' to give you the best! The phase-to-neutral voltage for a 3-phase supply, or the phase-to-neutral voltage for a single short-circuits value... Phase pump: read Only: Linear: Threading: single: Branch: search Topic couple of things short. Also have rated short circuit current calculation using MVA method: the 3 second value the! 1 kW load Topic Title: 11kV fault current of 4000 a, and pick up current of a... Can choose 1.5 Sq mm Cu cable for 1 kW load its 3-phase! Kw load of circuit is available in kW or watts the voltage things... In watts x Nos of TC on the formula for calculating a cable which complies all these requirements no!
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