Knee Point Voltage and Current Transformers
2009-09-23 17:22:00 dear friend, kindly any one explaine me what is the effect of knee point voltage in CT. If one PX Class CT having Vk>300V, Ia<30 mA how i calculate this CT BURDEN also what is the primary current when th ct is satsurated, thanking you, yours , B.JEY
Current and voltage in resistor?
2009-09-23 13:50:00 i want to know one nonpractical problem's solution. if we connect three 20V ideal DC voltage source and one 20ohm resistance in prallel to these votage sources then what will be the current and voltage in resistor? all four elements are in parallel
Two-Pole Induction Motor: Effect of Frequency and Voltage
2009-09-21 22:15:00 I have a 2 pole induction motor used for pumping fluid around a system.It is 3 ph and rated at 440v 60 hz it draws 4.2A at full load curent.The motor is wired in star configuration. If i run the motor at 480v at 50hz what would happen to the current ? Increase or decrease and why ?
Stepping Down DC Voltage
2009-09-16 18:40:00 How can i step down 24Vdc to 12Vdc 1.5A...i can use 7812 voltage regulator but there will alot of heat loss and need to have big heatsink.Is there a simple circuit that i can build.
So, This Is What Those High Voltage Danger Signs Means
2009-09-16 18:35:00 From Gizmodo: Remember kids, never plug your head in a high voltage capacitor. On the other side, watermelons are fine and fun. (Click read full story for video) Read the whole article
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?
Voltage Problem
2009-09-15 14:28:00 Dear All, We have a gate office and guest house located about 1500m away from the source or MCC used to feed it the required power for its control and lighting.I have laid down PVC cable of 150mm2 for the route of 1500m with 4 joints in the way. The voltage at the required point is less than 30
High Voltage Circuit Problems
2009-09-12 05:33:00 Hi, I have problem with high voltage circuit on color touch screen, i have checked all component & replaced the CCFL controller IC, still not working.. Thanks
Laser Printer Causing Voltage Drops
2009-09-11 10:41:00 Hello Folks, I have this issue in a pharmacy, you see, I have a power backup for servers and others, a UPS. My power backup is connected from a dedicated circuit, among plugs from screens, printers and others. However, I have 3 laser printers. I get voltage drops of 8 to 15 volts every 4 mi
Medium Voltage Transformers.
2009-09-10 11:17:00 There is urgent need of pumps and motors for one of our site and best we could source is 60HZ motors of 4.16 KV,now we have utlity supply of 11 KV 50 HZ.which transformer should i use 11 KV/4.16 KV of 50 hz or 60 HZ.What will be the cause if i use 60 hz on 50 hz and vice versa.
voltage regulation using STATCOM
2009-09-08 10:11:00 HOW voltage regulation using STATCOM in the transmission line ? please tell me which equation,s are used in this method ? what are the other benefits using STATCOM on the transmission line ? if anybody know , please tell me... thank u ...
Voltage Regulation and STATCOM
2009-09-08 10:11:00 HOW voltage regulation using STATCOM in the transmission line ? please tell me which equation,s are used in this method ? what are the other benefits using STATCOM on the transmission line ? if anybody know , please tell me... thank u ...
Mica Tape Porosity and High Voltage Coils
2009-09-08 07:53:00 Can anybody give me advice on how a mica tape porosity affects final impregnation of high voltage coil ? Like if tape porosity is 1000 sec/100 ml Vs another tape having porosity of 500 sec/100 ml. Does this really affect impregnation behaviour of insulation ( say for 11 kV coil)?
voltage change on old Wagner motor
2009-09-08 00:56:00 I have an OLD Wagner 1/2 HP motor Type RA, Frame 65Y, that will handle either 120v or 240v according to the nameplate. Unfortunately, no wiring diagram on the motor. It has four leads coming out and they are twisted together to form two leads. NO color coding or numbering. This is what I would c
Voltage Limiter
2009-09-03 06:58:00 Hi Gang, Know that this is simple but for the life of me today can't get going in the right direction. Took too may dumb pills I guess. I have to use a data logger that has a 30 volt +/- limit. But my voltage can run from 0 to 60 volts +/-. Not concerned with knowing the exact voltage am lo
Automatic Voltage regulator
2009-09-01 02:27:00 i need to build an automatic voltage regulator using PID Analog controller. The criteria is single laboratory alternator (3kVA). do i need the mathematical equation in dq ? please give suggest, block diagram, or anything to help me. Thanks Andri Suhindra
Voltage Booster Challenge for Low Voltage Sourced Power
2009-08-27 17:17:00 I am interested in a voltage booster mechanism for a very low voltage source of high current. To start with we take 100mV 10A, 200mV 5A sources to be boosted to say 3-6V range without any external power source. It is not possible to have many such voltage sources and there is only one such low vo
Voltage Multipliers
2009-08-11 06:56:00 I have to run a circuit for which the minimun input dc voltage is 3.5V but i have a battery of 1.2V so i want to get a circuit to triple the voltage(1.2V). can anybody give cicuit related to this topic ?
Automatic Voltage Regulator (AVR)
2009-08-09 21:01:00 tell me about authomatic voltage regulator(AVR) it component and how it works
Cable Voltage Grade selection
2009-08-06 16:57:00 Hallo everyone, this is my first post since I have just subscribed. I have the following problem: IEC 61892-4 says that "The typical rated voltage (U) for control and instrumentation cables considered in this standard is 250 V. In some instances for conductor sizes 1 mm
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.
For Vacuum High Voltage Discharge Experts Only
2009-07-30 15:48:00 What is the way to find safe distance for high voltage (30kV) electrodes in vacuum near 1nbar to 0.1nbar range in which arc discharge will not take place? If you have a proper graph for such high vacuum level for safe distance for electric discharge then you can add it up here. All vacuum high
Vacuum High Voltage Discharge - Experts Only
2009-07-30 15:48:00 What is the way to find safe distance for high voltage (30kV) electrodes in vacuum near 1nbar to 0.1nbar range in which arc discharge will not take place? If you have a proper graph for such high vacuum level for safe distance for electric discharge then you can add it up here. All vacuum h
Voltage A short Animated Film By Filippe Lyra e William Paiva
2009-07-29 13:00:00 Voltage is Short animated film from Brazilian animation studio Bam."Just like modular synthesizers, people connect with each other in order to achieve diverse objectives. In Voltage, robots, half-human and half-synthesizer, powered by a huge amount of energy, connect to each other in an electric and chaotic trance."www.bamstudio.com.-br Via: www.vimeo.com Read More tags: animation, short film
By: podflower.com
PI Jumper in High Voltage Transmission Line
2009-07-27 07:05:00 Hi Every body, Please tel me what is PI Jumper in High voltage transmision line 66 kV ? Iwan G
Measuring Voltage Across a Resistor
2009-07-26 14:50:00 I read this in a text Book "Voltage can normally be measured across a resistor, even though neither side of the resistor is connected to ground. If the measuring instrument is not isolated from power line ground, the negative lead of the meter will ground one side of the resistor and alter the opera
Relay Issue with High Voltage
2009-07-22 15:18:00 i have problem in relay it works some times at normal voltage ,but after sometimes the relay high voltage for pick .... what may cause for this problem....?
High Voltage Power Line Field.
2009-07-17 00:25:00 Last weekend I was floating down the beautiful Clackamas River catching trout all along the way. One section of the float went under a large number of high Voltage lines coming from Bonneville Dam, Id say somewhere in the ballpark of 12-20 lines. It had been such a majestically quiet float til we we
Wanted: High Voltage DPDT Contactor / Relay
2009-07-15 18:06:00 I come to you all for advice. I want to build what we call a flip flop box. It is designed to flip between 2 hid lights using only 1 ballast. It consist of dpdt relay, ballast, 2 lights, and a timer. People have been having problems with arcing between contacts destroying them. So what people s
Tariff Metering With Earthed Voltage Transformers
2009-07-12 06:20:00 I did believe that when the above was first published on 16Feb09 that someone from all the experts available in this forum might comment. This contentiious issue has large financial considerations. Nothing of note has been received. I would be glad to receive even a constructive
Understanding Stray Voltage
2009-07-12 01:50:00 I have listed below a video presented by Mike Holt on stray voltage. Mike is not an engineer but he is one of the leading experts on the National Electric Code. You may want to visit his site at http://www.mikeholt.com Your comments are welcomed. I tried to download the video but was not able to do
Phase To Phase Voltage Should be zoro volt
2009-07-11 13:20:00 ? When we are connecting two SAW welding power source with three phase of 415 volt,If I am checking voltage between 'R' Phase of Welder 1 w.r.t 'R' phase of welder2 I am getting 40 VAC where as it should be zero volt if I am connecting machine on same destrubution board same line. I don't kno
Hipot Value for Medium Voltage Cables
2009-07-09 20:12:00 I am looking for the Hi-pot value for testing used shielded cables 2.4KV
Can a high voltage transformer be energized from the primary side?
2009-07-05 23:23:00 can high voltage transformer ie 11 kv / 132 KV 63 MVA be energise from primary side ie from 11 kv side while 132 kv side breaker is closed on dead bus .On primary side 11 KV is coming from diesel engine of 15 MW rating. at the time of energising transformer the out put of engine is about 1 MW.We can
Supply Voltage in India
2009-07-03 09:11:00 why in india the generated voltage is 11kv why cant be other than that
Secondary Voltage on Ungrounded 3 Phase Transformer
2009-07-01 01:06:00 We have a situation where a 4160V delta: 480V wye transformer was installed without the typical neutral to ground bond. The only grounding is to the cabinet via the steel conduit. All loads are three phase and no neutral is run with the secondary condutors. When we measure A:B, B:C or A:C
Best way to Lower output voltage from 2x3.6v Rechargable Battery
2009-06-28 01:04:00 I would like to know the best way to regulate or lower voltage from 7.2v to somewhere around 4.2v-5.0v without wasting battery charge if possible... this is for a mobile device and will be using RCR14500 AA Protected Cells 3.6v each... so smaller the better without burning a lot of power from the ba
Air Conditioner Capacitor Voltage Rating?
2009-06-24 05:56:00 I had a service call on my air conditioner today. The tech replaced the dual capacitor with a new one that is the same capacitance but is a 370 volt unit instead of the 440 volt rating the original had. It is a whole house A/C unit that runs on 220 volts. Should I be worried about this or is this an
Voltage Drop and Electrical Field Strength
2009-06-19 11:26:00 Can Voltage Drop treat as one of Electrical Field Strength?
Stepdown Voltage
2009-06-18 17:49:00 how to step down 220v ac to 5v dc supply with out a transformer?
Voltage grade for cables
2009-06-18 13:54:00 Will some one explain me about selection of voltage grade for cables? I have 6.6kV / 11kV (E) cable. In which system i can use it. Can i use it for 11kV (E) system or 6.6kV (E) system. 3.8kV / 6.6kV (E), can i use it for 11kV (E) system?
Voltage Drop on Cable buried in Ground
2009-06-17 08:53:00 Is there a voltage drop in power lines buried in the ground as opposed to wires running overhead. I've heard yes and no, but no one can confirm this is true. This would be 220volt to a normal household to the main panel from the power pole maybe 200 ft away.
Voltage Drop in Buried Cable
2009-06-17 08:53:00 Is there a voltage drop in power lines buried in the ground as opposed to wires running overhead. I've heard yes and no, but no one can confirm this is true. This would be 220volt to a normal household to the main panel from the power pole maybe 200 ft away.
Voltage Flactuations for AC 3Phase Motor
2009-06-15 18:47:00 We have a 380V,3phase,3w motor to be connected to a 400V, 3Phase,3W power. Is it OK to perform at this voltage (5% voltage drop) constantly? How can we determine what % of voltage drip would be fine for the motor to run good. How can we boost voltage in-expensive way? The motor would be started by c
BDV of transformer in high voltage
2009-06-14 18:58:00 Dear Sir In 220KV or 400KV transformer when we used transformer oil , BDV is 60KV why?
Testing a LM317T Voltage Regulator
2009-06-12 18:05:00 Hello All I am the plant Electrician at a Copper Foundry and have been trying to revive a old circuit board for a coiler counter that was left outside for a long time.I have powered it up and have gotten one set to work but not the other as though both displays light up . My question is I am replaci
Air Conditioner Voltage Drop
2009-06-12 16:35:00 Hi, I have a problem regarding Voltage Drop.When I start Air condisner, then voltage goes down to 130( Around).And when AC is in off possion,then voltage goes up to 220(Around). Because of voltage drop,Ac can not run. But, all other connection is ok.Plz give the suggestion to solve this pro
Neutral Voltage = ? If Phase A is Shorted in 3-Phase
2009-06-12 05:48:00 At the output of a 3 phase power generator not conected to any load, if you short phase A through some impedance to ground then is there voltage at neutral pin? My guess is you see phase A... Neutral increases as any phase decreases. but is that only for flowing current? phase B and C ar |
|
 |
|
 |
