2 distribution Transformer connected same HT line &same ph.sequence,2ry should be same sequence or different?
821020
Each should be marked with a Vector Group Reference.\nThis gives phase angle and lead or lag angles. \nThese should be matched before connecting them.\nAfter connection the load should be introduced to the board in synchronism with the supply.
869383
(m)\n\n transformer is an electrical device used to convert AC power at a certain voltage level to AC power at a different voltage, but at the same frequency. \n\nThe construction of a transformer includes a ferromagnetic core around which multiple coils, or windings, of wire are wrapped. The input line connects to the 'primary' coil, while the output lines connect to 'secondary' coils. The alternating current in the primary coil induces an alternating magnetic flux that 'flows' around the ferromagnetic core, changing direction during each electrical cycle. The alternating flux in the core in turn induces an alternating current in each of the secondary coils. The voltage at each of the secondary coils is directly related to the primary voltage by the turns ratio, or the number of turns in the primary coil divided by the number turns in the secondary coil. For instance, if the primary coil consists of 100 turns and carries 480 volts and a secondary coil consists of 25 turns, the secondary voltage is then: \n\nsecondary voltage = (480 volts) * (25/100) = 120 volts \n\nA transformer may have multiple secondary coils to feed a number of electrical loads; however, power must be conserved, so the sum of the output power must equal the sum of the input power minus losses. Energy losses in transformers are due to a number of factors: these are copper losses in the coils themselves due to material resistance, core losses due to hysteresis (the reluctance of the material's magnetic domains to reverse during each electrical cycle), and eddy currents.
332581
Battery in series arrangement will have a combined voltage(force) to push more current to the bulb.\nFor simple analogy, It is similar to water level in a narrow container gaining pressure at the bottom the more you add water. Parallel arragement is similar to increasing the volume of water without changing it's height thus maintaing the same pressure at the bottom.
656571
b) and c)\n\nthe transformer works in such a way that electric current flows through the secondary circuit only when the electric current in the primary circuit is changing.\n\nwhen you close the switch the electric current in the primary circuit suddenly rises from 0amp to some value\nwhich causes electric curent to flow through the secondary circuit\n\n.. b) is true\n\nwhen you open the switch the electric curent in the primary circuit changes from the maximum value to 0amps thus electric curent flows through the secondary.\n\n.. c) is true\n\nbut \n..a) is false\n\nsicne a battery is a dc source wich means that as long as the switch is closed it supplies a steady amount of electric current through the primary. thus ther will be no current through the secondary.
1121368
A transformer can tested in various ways.Two common tests are the open circuit and short circuit test.Apart from these there are many tests to test the performance.
944281
+ve charge on one, -ve on the other....static electricity
255532
Its the same jack, rj48 is used for T1 or PRI lines etc & uses all the 8 copper lines if i remeber right. Where as rj45 uses 4 & is designed for ethernet
321301
It depends on your ISP.  Some will just charge you more for having 2 at the same time.  Others will break the first connection when the second gets on, but most ISPs do something to discourage the practice because it's "freeloading."
1079800
in one case you have half an ohm, in the other you have over 500 ohms.  It seems you may be reading one of the meters incorrectly.  One of the meters could be set to auto, while the other is not.
374405
Star-delta systems, as they are known in Great Britain and Europe, (transformers, motor starters, line reactors, electrode boilers etc) are essentially the same as what America refers to as delta wye systems, the only difference being in geographic terminology. \nThe phrase refers to two connection methods of a device in a three-phase electrical system: an example would be a distribution transformer with a delta primary, running on three 11KV phases with no neutral or earth required, and a star (or wye) secondary providing three 240v phases and an earthed neutral point.
574032
Normal household voltage is 115-120V rms single phase.  A center tapped transformer is used to give you the 115-120V across a pole to centertap or from pole to pole you will see 230-240V. This is all single phase.\n\nFor 3 phase a typical voltage from 2 phases (called line to line) is 208V rms or 480V rms.\nThe 208 is realized by having a "star or Y" setup with the center node as neutral.  Line to neutral is 120V and the 3 phases are 120° degrees apart.  That would mean the Line to Line (LL) is 120*SQRT(3) = 208.\n\nI am not certain why any voltages are specific multiples of 1.1.  The voltages that are commonly used in the USA are 120, 240, 208, 277, and 480 all rms.  Now for transmission purposes, the high side of the transformer voltage should be an integer multiple of one of these voltages.  I do know that transformers typically have integer ratios to either step up or step down the voltage.\n\nHere is some good reading for you:\n\nhttp://www.elec-toolbox.com/usefulinfo/xfmr-3ph.htm\n\nhttp://en.wikipedia.org/wiki/Three_phase_power\n\nBTW, you can become an Electrical Engineer if you know when and where to divide or multiply by either the SQRT(2) or the SQRT(3)!  ;^)
423967
first connect all grounds then take the  neutral on the transformer to your  receptacle neutral then  take one live wire from the receptacle to the switch and from the switch to the transformer being that it is two pole you will take a wire from each pole and take each "hot leg" wire to a separate "live" connection point on the transformer, provided that it is a two phase connection
222925
Dig here:\nhttp://www.scientifics.com/transformers.htm
947411
Depending on the utility company, some use Dyn11 and others Dyn1 or some other vector group that is universal to their\nsystem.\n\nThe reason being is that  they can be interconnected with the low voltage side of another transformer that is connected to the same high voltage supply circuit.\nDyn 11 means that the vector group is at the 11 o'clock position. If for instance two transformers on the same high voltage line side had different vector groups say Dyn11 and Dyn 1 they would always be 30° out of phase, this would mean that should they be interconnected they would immediately trip the incoming CB/fuses.\n\nSource: Electrical Engineer (ret.) with 45yrs experience
851608
WYE connections reference the line values of current and voltage to a "hard-wired" neutral. This means  \n (line voltage) = 1.732 * (phase voltage)\n (line current) = (phase current)\nThis is a much easier system to use when manufacturing an electric machine ... there will be a "neutral" - complete with leads - that can be used when troubleshooting.\n\nDELTA connections reference the line values of current and voltage to a "theoretical" neutral. This means \n (phase voltage) = (line voltage)\n (phase current) = (line current) / 1.732\nBecause of the "theoretical" nature of the neutral connection, the winding can experience far harsher effects from harmonics than the standard WYE version. Thus it isn't used as often in large machines ... although it's fairly common in smaller (<100 HP) designs.\n\nAny 3-phase machine can be used in either format; in fact, most multi-speed windings employ one of each.\n\nThe simplest advantage may come when looking at transformers, though. With a WYE-DELTA transformer, there is no possibility of ground faults between the input and output sides (unless, of course, a major accident happens!). IT also has an immediate 1.732 ratio in terms of voltage/current ... even if the turn count is the same on both sides.
22663
Either above ground or below you have loss dependent on the length of travel.  It is more efficient to run at higher voltages, that is why there are step up transformers at the beginning of long runs and step down transformers from the main lines to the house lines.\n\nSome loss occurs as a result of heat energy
888989
230v is measured between phase and neutral therefore L1 (R) N, L2 (Y) N and L3 (B) N.\n\nNote a star connection is Y. In your house you use 230v-240v single phase, i.e phase and neutral. Phase to phase 240√3 = 415v.