Again, if the source voltage is 11 kV and load is to be fed by 415 V, then the … Can you explain me how to calculate the output current of 3 phase trasformer? Dear Sir, I want to know about how to select step down transformer rating. You May mail the same directly to me . Having said that, the impedance in the primary circuit could effect the PF of the system. In a numerical probem, transformer rating is given as 220/13.8 KV. In both examples above you can get away with using 200:5 CT’s with a rating factor of at least 3. Can any one explains about Cable cross bonding and transposition clearly.. P unit is KW S unit is kVA, MVA. It can alert you to problems that may arise on your system as well as help you install the right size CT’s. Current/ Measured Secondary Current X 100%. Hi Abdullah, Coming to your question, first of all, you have to consider transformation ratio of your voltage level(i.e 132kv/11kv,132kv/33kv,33kv/11kv), then, with respect to my recent post, convert all the megawatt loads to current loads(i.e the megawatt loads for 11kv convert them to current loads by multiplying the total sum by 60, while those of 33kv megawatt loads will be also converted to current loads by multiplying the total sum by 20). Pls reply. 5MVA, 11/3.3KV (4 NO). please inform it’s urgent to me. Use the following formula: For a 120/208v three phase 100 KVA tranformer we calculate the full load ampacity as follows: That gives us 277.58 amps. Dear sir I am facing a problem with electricity board of Talangan State. When considering the apparent power we also considered the effect of inductor and capacitor which always will be minimized by using power factor correction technique. Electric Bill Calculator with Examples, How to Find The Suitable Size of Cable & Wire for Electrical Wiring Installation? I know very well to ascertain the capacity by opening the transformer and then measuring the Core area, primary and secondary winding cross section area and then measuring number of turns each of primary and secondary. So for proper Guidance you may send Transformer”s number plate/ name plate details directly to me “rajlahare@gmail .com “. This is important because it helps determine what size transformer is needed to handle a particular load. Did you check the Transformer power factor (As improved P.F increased the T/F Capacity as well) or did you verify the proper cooling of the transformer? S2 = P2 + Q2 ? Note: 1.73 is gotten from Root three (root 3) Take care! 1-800-892-3755 www.jeffersonelectric.com Dry-Type Transformers 1.3 Transformer Basics 1 How to size a transformer Transformer size is determined by the KVA of the load. Similarly, two 2MVA transformers are connected in parallel, so there are 2 pairs. Another thing that you will do is look at the demand on a transfomer by looking at all of the meters being served by a particular transformer. If the demand factor is 0.6 and the diversity factor is 1 %. On hearing this solution can be suggested. Calculate an example as follows. But this MVA rating is of 3 levels depending upon the cooling used. RAJ LAHARE, Dear Jayawanta, Your query is not clear raj lahare, Hello i want to know HV and LV coil resiatance and inductance values of 11kV/440V rating 100kVA transformer, Dear Mahantosh, Refer IS 2026 and You will get all the details RAJ LAHARE. Transformer transmit high electrical energy so reduce the unite of voltages level engineers used kilo(K) unit for transformer. I HOPE AT LEAST WITH ALL THIS CLARIFICATION I WILL GET PROPER GUIDANCE . Thanks. This system arrangement is very common, both at the utilization level as 480 Y/277 V and 208 Y/120 V, and also
on most utility distribution systems. HOW TO Convart H.T amper to L.T Amper..formola. Then , if you want to convert the load to megawatt, you divide 50A by 20. Here the transformer is already received and is sealed. A Complete Guide About Solar Panel Installation. As the transformation ratio is low I think this may be autotransformer. If voltage of primery winding is more than that of secondary winding then the transformer is step down type. What is the capacity of highest size motor ? The Capacity means How much load can be put on the said transformer without over heating and with voltage drop within limit .Wish proper guidance. Please give the Rating plate details of both, the Transformer and the Generator, If possible the schematic diagram of the system so That better answer can be given. suppose I have the following in my power system: Transformers: 140 MVA, 132/33KV (2 NO). Limited Edition... Book Now Here. dear 220kv/500kv transmission poll install in the forest.and we don't know the load and the production side.so tell the method of load and production identification?
, hi sir, i want to design a 500VA rating of transformer.but i dont understand how to select the v/g & c/n value? In your case, the transformer rating looks like, 220kV is primary while 13.8kV is secondary… (In case of Step down i.e. Because it has three resins: 1. Since transformer are sized based on KVA we need to convert this number to amps in order to know what the transformer is capable of handling. These ISS publications are available on internet. for 600 KVA transformer what will be the line current or individual phase current? Load is calculated in ampere or megawatt not in MVA. For simplicity we will start with 100 KVA single phase 240v transformer. Please give me the formula for total load and required transformer rating. Follow. 160kVA Transformer Capacity overheated on 120kVA load? Fuse rating in Amps = 2 x Full load current. How we can check / test that the transformer is of Given rating ? Unfortunately the queries are not Technically perfect, rather they are vague. The Turns Ratio is equal to N 1 / N 2 = V 1 / V 2 = (2000 / 200) = 10. Sir ,why we dont consider power factor for transfrmer but for generator or motor. When you test the site you will find out how many amps are on the service. Get Free Android App | Download Electrical Technology App Now! The transformer losses are mainly depend in voltage and current so the voltage=v ,current,=A and the rating in terms of transformer is kilobits so we can say transformer rating in kvA. further whether the transformer is core type or shell type ,then the rating can be calculated. How can i calculate the ratting of transformers? I suspect that the supplier must have supplied lower capacity transformer with rating plate of 160 Kva and I want to test / investigate this . The final number determines how large a transformer you need for your system. What is the rating of vcb for 500 kVA transformer. 25% Off on Electrical Engineering Shirts. • Once the model has completed calculating the load for all the transformers. The Load Factor is calculated by dividing the total consumption of electrical energy (kWh) for a given specific time of period to the product of maximum demand (kW) and the number of hours in that period. Now calculate for the rating of transformer according to, P=V x I (Primary voltage x primary current), P = 11000V x 5.25A = 57,750 VA = 57.75kVA, Or P = V x I (Secondary voltages x Secondary Current), Once again, we noticed that the rating of Transformer (on Nameplate) is 100kVA but according to calculation…it comes about 57kVA…. It involves using a straightforward formula to generate your kVA requirements from the current and voltage of your electrical load. voltage X Transformer Sec. My question is ..what amperage could I get from the 600/347 side ? Both consider rating important only its concerned the power factor fluactuation to be maltiply. Now calculate for the rating of transformer according to P=V x I (Primary voltage x primary current) P = 11000V x 5.25A = 57,750 VA = 57.75kVA Or P = V x I (Secondary voltages x Secondary Current) Dear Sir, I specifically say that the load is 120 KVA and not KW so the question of Power factor do not come in picture. dear all, tel me some explanation about leakage current in 100kVA distribution transformer and what is the maximum leakage current allowable in transformer, Dear Gubendiran, Please refer to ISS 2026 and ISS 1180. (adsbygoogle = window.adsbygoogle || []).push({}); (adsbygoogle = window.adsbygoogle || []).push({}); Learn how your meter works and save on your power bill. Whether this is single phase or three phase ? In other words, for a given load (with, hi sir, how do the transformer designer calculate the turns, emf, loss, flux, area if we say we need1600KVA. If it is on 11kv, the 50A load will be converted to megawatt by dividing it by 60. Awesome, very well written article. so there no meaning in design of frequency drive for a transformer. Can anybody help with the formula to use for this calculation?. There is one more step that you have to do in order to find the full load ampacity and that is to use the square root of 3 which rounds out to around 1.732. RAJ LAHARE. Short circuit current at TC secondary (Isc) = Transformer full load current / Impedance Short circuit current at TC secondary = 1203 / 5.75 = 20919 Amp Calculate the total connected load. or in other words., The transformer fuse rating is equal to 2000 times of total apparent power S (kVA) in kilovolts amp divided by the voltage V (V) in Volts. what is the safety factor or service factor of transformer.lets suppose we have a load of 1200 kva now tell me appropriate size of transformer for this load thanks. Secondary Current = Transformer VA ÷ (Secondary Voltage … Do you want to know about the weight or T/F or Rating of Transformer? can you explain me with formula? My origional question was regarding a transformer supplied by a contractor saying 160 KVA capacity but at about just 120 kva load this transformer gets over heated than the specified temperature. But you’ve done as 208V for 3-Ph Instead of 415V. What is Power Factor (Cosθ) ? RAJ LAHARE, i want to select frequency drive for transformer application.transformer rating is 500 va .what will be rating of drive pls help, Dear Bhushan, It may be kept in mind that the Transformers are the sours of electrical energy from the system at given voltage. Up tp 93% Off - Launching Official Electrical Technology Store - Shop Now! For a Three-phase transformer, kVA = (√3 x V x I) /1000 = (1.732 x V x I) /1000. Secondly can we use it by changing its tap on 6.6kv. Kva = k * V * I 0.5 = k * V * 32 V = k * 0.5/32 = k * 0.01563 = 15.6V rated, cz transformer rating depends on temprateure and tempreture is depneds on loss as you know that their is two type of loss copper and iron copper>> Current (A) Iron>> Volt(V) So if it depends of powe then we can say that it will in in KW but it denpends on Loss So we used in KVA, transformer rating is related to its losses. A relationship principle known as Ohm's Law states that amperage (A) x volts (V) = watts (W). Why you write P (kVA)? Here is the rating of Transformer is 100kVA. i’m having troubles determining which of the stated transformers have greater losses: a 33kv/415v or a 11kv/415v. Line to Line voltage x 1.732. Let’s do the same thing for a 120/208v three phase transformer. Required fields are marked *, All about Electrical & Electronics Engineering & Technology. 1MW, PF=0.9 (4 NO). Multiply 120 volts times 5 amps this equals 600VA now lets multiply the 125 percent start factor. An oversized transformer is a transformer that is being under utilized. Short Circuit Current Calculation Example. As per basics of transformer , The power capacity of transformer ( VA ) is based on the cross section and the permeability of the transformer core. This is how transformer sizing is calculated. 1.6MVA, 33KV/415V (8 NO). Now you are using resistive load at 12 volts DC and 100 watts so your secondary side current willbe 8.33 Amps so you may use 8 Amps fuse. Thank you. To calculate the full load ampacity use the following formula: So, for a 100 KVA transformer we will multiply 100 x 1000 and then divide it by 240v. Dear Nirmal, This is not reply to my query.Your answer gives the loading on the transformer and NOT the Rating / capacity of transformer. The power factor of load may be assumed to be 0.85. Can You please send the photograph of your existing transformer ? One is the line to line voltage of the secondary output of the transformer. Line voltage, or primary voltage, is the voltage from the source. daer all The word Capacity is very clear. The reason why i am saying is there is no 50KVA transformer with a voltage of 208 Volts. Its total power its smaller than the consumer needs( the transformer its 1000kva and the consumer typically needs its 1200kva) The loads are instantly dramatically change because of heavy loads machines( rocks crushers) and the plenty of smaller motors. The first step to sizing a transformer is to determine the load that will be served, either at the branch circuit, feeder or service level. I would like some technical assistance regarding transformer. – Examples in British and SI System, Thevenin’s Theorem. RAJ LAHARE, Your answer may be right only if you are assuming a single phase transformer. I must confess that this is a good place to be, I was able to carry out short circuit Voltage Impedance test on a 7.5MVA, 33/11KVA transformer. 2) the percentage impedance are: 140 MVA TF, Z%=12.5 50 MVA TF, Z%=12.5 1.6 MVA TF, Z%= 6 2 MVA TF, Z%= 6 5 MVA TF, Z%= 8. Simply greater MVA means more load can be connected without overloading the transformer. How to Calculate/Find the Rating of Transformer in kVA (Single Phase and Three Phase)? Yes it is 100% right. Typical PE power problem on transformer losses. And Primary Current on High Voltage side is 5.25 Amperes. 2. You need to know what your answer represents before you go punching numbers into your calculator. 13.8kv is primary and 220/380 is secondry, Hello, I am facing a little problem with transformer calculations. of turn on each side of transformer?
pls kindely rply me
. HELP ME OUT, why is it that 12v from electricity can electrocute but same 12v from car battery can not be electrocuted. If we dont know the line current,how 2 calculate the rating? REQUEST A QUOTE: Dry Type; Pad Mounted; Substation; Pole Mounted; Buck Boost This covers the entire operating range of each transformer. Multiply the total wattage by 1.25 to adjust for loss due to cable distance. are the formulas same for step up and step down transformer? Further your output voltage will also be 415 + 41.5 =456.5 volts this will damage your Equipment connected on LV side of transformer. What is Electric Current and how it relates to Metering. Cos fi or P.f Definitions & Formulas. Kindly assist me. how can we determine the KVA rating of a transformer from test. For example the total load of 200 Kva from small motors like 5 , 10 HP ( KVA ) each the transformer of 200 KVA only is enough.But If a individual load is more tha 150 KVA You will need at least 300 KVA capacity transformer. Correct me if I'm wrong ' The power factor is determined by the load, not the transformer. Well, most transformers are sized based on KVA, kilovolt-amperes. for a 3 phase transformer, is there always line to line voltage written on name plate for star connection? Dear All , If you check the second example provided that states 50KVA transformer and the voltage taken is 208 Volts is probably not correct . Match transformers to load type and use as few transformers as possible (which means maximizing the load per transformer) to effectively reduce voltage drop. When : 1. kilovolt amps = (1.732050808 x 1500 x 150) / 1000. (3) Decide Size of Transformer. One reason specific to metering is that it tells you the number of amps a transformer is capable of producing so you can size your CT’s accordingly. Transformer sizing. – The maximum capacity of distribution transformer acceptable is 400 kVA as a standard capacity. To calculate full load current, use this formula: RAJ LAHAREthe. If three phase what is the vector group ? And the basic design of the transformers are related with the frequency, wave form, Permeability of the core and the voltage, And the Drives are designed for limiting the inrush currents of the motors Say it is a current control device. HT Side cable? For full load of 500 watts at 12 volts the current will be approx 41 Amps so the fuse required will be 40 Amps. Single-Phase has two lines of AC power. 415/230V and VA rating. What is Power Factor (Cosθ) ? 208 x 1.732. How to evaluate your electrical load capacity. There are 208V in three Phase instead of 415 like UK and Asia. Then, sum your answers to get the total current load of the 132kv. But Wait, A question is raised here… Look at the General nameplate rating of a 100kVAtransformer. there are copper loss and core loss in trasformr. This rating is labeled on the breaker itself. thanks for the reply sir.. i seen the both standards there are no specific value of leakage current.i want standard value of specific leakage current.standards only says how to find and measure leakage currents.i think 100mA for 100kVA distribution but how??? Step by Step Procedure with Solved Example, Automatic Street Light Control System using LDR & Transistor BC 547. Dear Jan, For technically correct calculation of the requirement of transformer some additional DATA will be required that is The details of 39 KW 3 phase load bASICALY what is the highest idivisual load.And what is the source voltage. In the guide to transformer kVA ratings below, we’ll explain in more detail how to calculate the required capacity … I have a transformer with 110/220 input primary,secondary has:0v 33v,0v 13v,27v 0v 27v,9v 0v 9v.The CD player consumption is 25watts.How do I get the amps from the secondary?.Do I have to divide with 25watts with all of the secondary winding?. copper loss is depends on current and core loss is depends on voltge,so the rating of transformer is said to be the product of voltage and current. After that, divide the current converted load of 33kv by 4 to get the current load on the 132kv and divide the converted current load of 11kkv by 12 to get the current load on the 132kv. The required capacity of the transformer = Maximum demand / Diversity factor = 50 / 1.46 = 34.246 or say 34 KVA. RAJ LAHARE. Finding the full load ampacity of a transformer is a very useful calculation to have on hand. 2) Percentage impedance of each transformer. Say for a transformer of 230 / 12 volts and 60 VA capacity ( Single phase) The max load can be 5 Amps on 12 V side if the load is exceeded the transformer will get overheated and may burn off. You as the meter tech will most likely be going out and testing transformer-rated metering installations. how to find primary and secondary amp of a 1500 kva transformer (11kv/400v). Please post the single line diagram of the scheme. How to calculate VCB current rating for 2000 KVA transformer ? For the transformer, the fuse rating is equal to the two times of the full load current. Next let’s calculate the full load ampacity of a three phase transformer. In any query if correct input is given the answers can be faster. Based on the Voltage and the VA capacity the current is arrived at and then only considering standard losses the current is calculated which inturn will give the cross section of the winding conductor. For proper answer you will have to give following additional information. Points to be remembered: KVA is always greater then KW because KW only have the effect of resistor. Three phase transformer has three connections such as delta, star and interconnected. For a single-phase transformer, kVA = (V x I) /1000. Dear Bill, Your question is rather confusing, for Better and correct technical answer please send the rating plate details of both the, transformer and the Diesel Generator.

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