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Disadvantages of ONAN/ONAF against ONAN transformer
2009-09-23 14:55:00 Is there any technical disadvantages of using ONAN/ONAF against ONAN transformer?
Current on primary side of transformer due to secondary side fault
2009-09-22 00:43:00 I have a question 13.8/0.48 kv 1mva with 5.75 % reactance what will be the fault current at primary side due to fault at secondary side 1 single phase to ground 2 phase to phase 3 three phase top ground kindly help
Current on Transformer Primary Side
2009-09-22 00:43:00 I have a question 13.8/0.48 kv 1mva with 5.75 % reactance what will be the fault current at primary side due to fault at secondary side 1 single phase to ground 2 phase to phase 3 three phase top ground kindly help
isolation transformer / single phase
2009-09-19 11:38:00 dear sir , could you give me the voltage between the secondery and primery winding for 220 v single phase isolation transformer as below : phase primery to phase secondery . phase primery to neutral ral secondey. phase secondery to earth . neutral secondery to earth . r
Tan Delta Test of Transformer Oil
2009-09-18 18:14:00 please give details of doing tan delta test of transformer oil? please describe step by step and calculations too.
Isolation Transformer for Safety
2009-09-18 17:45:00 Hello, It's time for another stupid question! Today the subject is "using isolation transformers for safety". I'm new in the big city and just fell off the electrcial cart. I'm having trouble visualising how an isolation transformer on an AC line helps reduce electrical shock. S
Transformer Core and B-H Characteristics
2009-09-16 11:45:00 How I want to know how the B-H charateristic of cores used in transformer or any other device changes with a period of time. I mean to ask the effect of climate, period of usage of transformer, effect of under load and overload on this B-H curve. Whether the curve for new core will be same as B-H cu
Transformer Current
2009-09-16 11:13:00 How to calculate the current from 12v step down transformer when the primery voltage is 230v at 5A current & f=50Hzs
Transformer
2009-09-16 06:43:00 Hi friends i m making LED ligthing in my house.I m having one 12v step down transformer it gives current of 500mA.But when i calculated the current theoroticall it gives 100A.Input primary voltage is 230v ac & current 5A.Thus tell me how it can vary from actual
Transformer for LED Lighting
2009-09-16 06:43:00 Hi friends i m making LED ligthing in my house.I m having one 12v step down transformer it gives current of 500mA.But when i calculated the current theoroticall it gives 100A.Input primary voltage is 230v ac & current 5A.Thus tell me how it can vary from actual
what is the relation of the vector group of transformer with the generator
2009-09-16 04:22:00 My Question is: what is the relation of the vector group of transformer with the generator voltage? Why is it necessary to specify the vector group in ordering a transformer?
Transformer Vector Group and Generator Voltage
2009-09-16 04:22:00 My Question is: what is the relation of the vector group of transformer with the generator voltage? Why is it necessary to specify the vector group in ordering a transformer?
how to test single phase isolation transformer
2009-09-15 12:54:00 dear sir . could you guide me how to test the isolation transformer / single phase . and so is i use a lamp for testing between the primarey and secondery winding does it lighting if i use a primery phase with a secondery neutral . regard
Current Transformer Types
2009-09-14 11:19:00 What is the difference (Technical & Construction ) between CBCT & Normal CT?
Current Transformer Costs
2009-09-14 11:17:00 Why the cost of CT increases with the decreasing of its CT Ratio (Technical Reason)?
Electric Motor & Transformer Rating
2009-09-14 06:11:00 1.Just to re-confirm ,The Electric Motor rating ( KW or HP ) mentioned on Name Plate idicates Output Power delivered at Shaft or input power from the mains supply point.? 2.Transformer Rating mentioned on Name Plate in KVA / MVA indicates Trafo input power or output power ?
Electric Motor Ratings and Transformer Ratings
2009-09-14 06:11:00 1.Just to re-confirm ,The Electric Motor rating ( KW or HP ) mentioned on Name Plate idicates Output Power delivered at Shaft or input power from the mains supply point.? 2.Transformer Rating mentioned on Name Plate in KVA / MVA indicates Trafo input power or output power ?
Neutral Current transformer
2009-09-12 14:08:00 The transformer capacity is 15 MVA, 33 KV / 6.6 KV, CT Ratio – 1600/1, What will be the Neutral C.T. Specification
transformer of korea
2009-09-11 15:49:00 in our company we buy a project of korea (CP).in pcc panel i saw one transformer i saw in there rating is 440 V/220V.in this transformer ony two phase is used (no neutral) and there is shock pruff in secondary side ..whyyy
Neutral Current Transformer.
2009-09-11 07:50:00 How to calculate the specification of Neutral Current Transformer..
Protection Relay Setting for Transformer
2009-09-10 18:14:00 for a 6mw alternator what will be the protection relay setting and what will be for a 8mva transformer.
Transformer pit
2009-09-10 14:07:00 Dear all, what is the difference between transformer "oil soak pit" and "burnt oil pit"? Regards, PG
Transformer Terminology
2009-09-10 14:07:00 Dear all, what is the difference between transformer "oil soak pit" and "burnt oil pit"? Regards, PG
Transformer Power Factor & Transformer setting
2009-09-08 04:49:00 Dear All, As I knew that transformer didn't has a power factor. And in the nameplate wasn't mentioned the real power (kW). The apparent power only (kVA). Could you please explain why does it? I have power transformer with spec OA/FA 5000kVA-5600kVA / 6250kVA-7000kVA and the age of transfor
Transformer Power Factor and Transformer Setting
2009-09-08 04:49:00 Dear All, As I knew that transformer didn't has a power factor. And in the nameplate wasn't mentioned the real power (kW). The apparent power only (kVA). Could you please explain why does it? I have power transformer with spec OA/FA 5000kVA-5600kVA / 6250kVA-7000kVA and the age of
oil leak in transformer
2009-09-06 10:14:00 Hi How can oil leak in transformer avoided? please share your ideas. Regards gova
Transformer vs load
2009-09-05 08:07:00 1. The customers connected to a transformer are operating electrical loads with name-plate rating totaling 250 kW 2. The 220-volt wiring between the load and transformer is properly sized and there is virtually no voltage drop on the circuit. Case 2: 1. Same load. 2. The 220-
Electrical Engg. related to Transformer standard ratings
2009-09-01 18:03:00 Can u anyone please share the standard power transformer rating for 6kV to 400V system. Please provide any link/location for standard transformer manufacturer. Regards, Karthick
Power Transformer Ratings
2009-09-01 18:03:00 Can u anyone please share the standard power transformer rating for 6kV to 400V system. Please provide any link/location for standard transformer manufacturer. Regards, Karthick
Transformer Conversion
2009-08-31 15:33:00 Is it possible to successfully convert a resin type ,air cooled,dry type transformer to an oil immersed ONAN transformer? Will such a conversion reduce the transformer losses?
IS STEP DOWN TRANSFORMER REALLY REQUIRED ON OUR SET-UP
2009-08-30 13:28:00 Hello Sir, We have purchased a new generator set as to be used in our small plant.Its a 200KVA, 3 phase and 440 Volts. We have series of motors in our plant the highest is 25 HP motor. We uses 220 volts for our domestic appliances and ligthings by putting one line to ground to create 220 volts.
Formula to design 120KV 0r 220KV transformer
2009-08-27 11:15:00 Pls let me know that what are the steps,procedures and formulas to design 120KV 0r 220KV transformer. Usman Ali Khan Electrical Engineer
Sizing of Transformer for Single Phase and Three Phase loads
2009-08-26 19:49:00 Currently I am executing a project wherein power supply is to be provided to 5 nos. of Analyzer cabinets. The power supply to these analyzer units are at voltage levels 120V and 220V. The VA of the load connected to each analyzer cabinet is - @120V, 1Phase, 60Hz = 2320VA and @220V, 1Phase, 60Hz = 13
Type of cable selection Between Transformer and NGR
2009-08-26 08:36:00 Hi Kindly be informed that i have 11kV/3.3kV 7.2 MVA transformer having NGR 100 OHM risistor,Require size and Insulation class of cable between Transformer star point to NGR risistor.Please provide referance and calculation as wel Best regards Abdullah
Life Assesment Procedure for Casr Resin dry Type Transformer
2009-08-26 08:17:00 We are a manufacturer of Cast Resin Dry Type Transformer in India. We would like to know the procedure for Life Assesment of the Cast Resin Transformwe. Please advise us ASAP. regards Hitesh Pandya
Transformer Impedence
2009-08-25 07:08:00 Dear All What is meant by impedence of transformer i.e if a transformer has 4% impedence what does it means & if a transformer is manufactured and its impedence is out of given rated tolerance(e.g 4.6% against 4% with 10%tolerance) how to rectify this to bring it down within r
transformer
2009-08-07 08:30:00 hai.....there is possible to construct the transformer in various rating..
UPS Bypass Transformer
2009-08-06 23:43:00 What are the advantages and disadvantages for using the Ferroresonance Regulating Transformer and Shielded Isolation Transformer for the UPS Bypass system? -MS
Transformer Protection
2009-08-06 06:52:00 I have a 11/22KV, 20MVA, delta-star, stepup transformer, which type of protection is required for this transformer. I want to also know that which type of neutral grounding method is used for particular requirement with its calculation.
Transformer Test Results and the Expected Values
2009-08-01 17:58:00 Hi all I have attached the meager test result of a 315 kva step-down transformer (15kv/400v) transformer (the test is carried out without the oil ).I didn't want to lose the oil I just want to be sure that the transformer is ok before I put the oil in . Please tell me whether the transfo
Vector Group of Transformer
2009-07-31 20:19:00 When changing the phase sequence in HT side of transformer will it bring any phase angle shift in LT side?
Scorpion EXO-900 3-in-1 Transformer Helmet
2009-07-30 20:00:00 The Transformer Helmet provides three separate configurations, in addition to some other customizable features that make it the ultimate safety accessory for your next motorcycle ride.
Impedance Voltage for a Transformer
2009-07-30 16:28:00 Sir, What should be the percentage of impedance voltage for 1000kva and 1250kva , 11kv / 433 volts Transformer, what is the effect on transformer if it changes below and above the standards ? Please give full details regarding this.
Transformer Secondary Faults
2009-07-30 14:50:00 Hi all. Can anybody tell what are all the effects on the primary when there occurs earth fault ,over current faults on the secondary of the transformer? Is it being cleared by the primary side relays or differential relays?
Transformer Connections
2009-07-29 17:28:00 hey i would like an understandable answer of why in certain installations, 200A maximum socket metering, they use three transformers or sometimes two, does it provides a stronger voltage flow or what?
Three-Phase Transformer Application
2009-07-28 21:26:00 In a 480 volt 3 phase wye system, (240 volt) is needed. Would a wye/ delta 3 phase step down transformer (480/240) be needed or a delta / delta (480/240) be needed?
Transformer Tap Change and Short Circuit Impedance
2009-07-26 08:45:00 Hello, Considering the following : Transformer upstream system :6.6kV Transformer ratio : 6.6 / 0.44kV Tapping range on 6.6kV: +/- 5% Short circuit impendance : 6.25% at 0% tapping. Full load loss at 0% tapping : 17kW Question : How do I calcul
Current Transformer (CT) Cores
2009-07-24 18:49:00 How can I identify the metering core,protection core and PS class core of a three core CT at site by testing if the CT name plate is missing?
Insulation level of Current transformer
2009-07-22 08:02:00 What is the insulation level of a current transformer in 11 KV system for earthed & unearthed system. |
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