Electrical Engineering

electronic engg deals with the ic's ,active and passive elements and circuits and electrical power engg deals with the electric generation distibution and protection.

There isn't enough information here. Available short circuit fault level can be given as a KVA value for different types of faults, but I assume the questioner is looking for a relationshiop between (transformer?) KVA and available short circuit current -

If my assumption is correct, there is no direct correlation without knowing the transformer positive and zero sequence impedances. If these are known, you can assume the source impedance is infinite, and calculate the maximum short circuit current through the transformer as follows:

lowside fault current for a 3 phase fault on the lowside of the transformer:

lowside kV (line to line) / (1.732 x per unit positive sequence impedance x scalar to real impedance),

where scalar to real impedance is equivalent to lowside kV (line to line) ^2 / base kVA.

For a L-G fault, do the same with zero sequence impedance.

a straight under G means its for direct current or if its zig zag its for alternating current...

It depends on the program you are using.

If you are using PSAT for academic study, then your data have to be in m-file after conversion from simulink.

If you are using commercial program like NEPLAN, then your data have to be in nepprj file.

A NEPLAN data can not be used in PSAT program unless you have a measn to do the conversion.

to properly run optimal power flow (OPF), make sure your power (load) flow runs. Then input your objective functions on generator being used or load. The objective function is determined like a*P^2+b*P+c, where a, b, and c are constants and P is the real power being generated. Same applies to reactive power pricing.

So, all you need do after you set up power flow is to model your objective function this way. Some programs also model objective function as volatage var or loss. But all has cost modeling also as objective function.

With this set up, your OPF program will run.

hope this answers your question.

It's an amount of twisting, measured as force times distance. A torque of 1 Newton-metre means a force of 1 Newton on a 1-metre arm.

if you drove the 18V winding with 230V the transformer would burn out, if it didn't catch fire first

Put the key in the alarm disable lock and turn.

There are two types of door systems. One as above, which is a free standing door system and the other where the door is tied into the buildings alarm system. In both cases the person that looks after the buildings security has to be notified. They will use a key that they keep and disarm the door for you. This security person also has the ability to lock the door alarm out of the buildings security system if that is the type of system used. Usually you have to sign a paper as to why the door open request was made and when you finish the time the door was brought back on line.

The Bus Bar is (usually 3, or 4) solid copper bars that run through an MCC (Motor Control Center) and just supply power to the individual 'buckets' (compartments that contain the individual motor starters).

The only protection for a bus bar would be from the 'Panelboard', or 'Switchboard' breaker that feeds the bus bar mounted in a separate MCC.

Make Sense???, let me know if not...

There is no legal way to do this without properly installing a UL listed transfer switch. Transfer switches have a mechanical interlock that prevents the utility power and generator power from being connected at the same time. The codes and regulations protect you from having your generator and wiring destroyed, but it also protects the utility workers from injury. The problem is, if a utility worker were to come out and install a meter, not knowing there was a generator hooked up. If there were a power failure, say, because of downed line, and the utility company sent workers out to work on it, they would think the line was dead. Your generator could be backfeeding voltage onto the lines and could conceivably electrocute the worker. There are actual cases of people killed under these exact circumstances. If you need temporary power during remodeling or construction, there are ways to get power, but you need to hire a licensed electrician to do it right and be legal. If you need power because your utility disconnected for nonpayment, they will take a dim view of any jury-rigged arrangement that could jeopardize the safety of their workers. They will take legal action against you, guaranteed. Better to run a separate cord around the house to power the lights and remain isolated from the buildings wiring.

Scaler. The electric field is its vector counterpart.

It will not work at all.

Auxiliary transformer- current transformer

The current transformer is working based on two theories.

1.Ampheres law.

2.Faradays law.

Amp.law- whenever a current flows through the conductor it will produce magnetic flux around the conductor.

based on above principle- current flows through the primary will induce a magnetic flux in the CT core.

Faraday law- whenever a conductor cuts the magnetic flux or magnetic flux cuts the conductor will induce a emf across the conductor

based on above principle- the magnetic flux in the core will cuts the windings. so emf is induced across the secondary terminals .

whenever the secondary terminals connected with burden will make a closed path and current flows through the secondary to burden.

DC motors use PWM (pulse width modulation), which can easily increase or decrease the power to the motor, thereby increasing or decreasing the motor speed by modulating the width of the pulse. Stepper motors have fixed frequencies, thereby having fixed motor speeds. As a result, the speed of the stepper motor cannot be controlled when the load is increased.

The fuse is rated to protect the equipment, the supply, and you. Change the fuse for a higher rating and you compromise your safety and equipment and supply safety; increasing the risk of electric shock and of fire.

lagging

You can get them from EBAY

http://www.ebay.com/itm/20-GW-Good-Work-Rectifier-IN5399-Diode-RoHS-Free-/390062236202

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You can get them from ebay but you would be paying 50 cents for a 4 cents device plus shipping. which in my humble opinion is a ripoff.

Farnell still sells this device for GBR 0.03p (4 Cents).

or you could substitute it with something like the CR1-100

None that come to mind.

From the pictures they look differ in Bracelet and Case design. Double Eagle has a more elegant bracelet and I guess is newer.

Constellation 09 series is pretty much look alike older double eagle (model # 1511.30) with 35mm Case Diameter while the newer Double Eagles (like 1513.51) have 38mm case diameters.

Constellation 95 Case = 33.5 and 35.5

Constellation 09 Case = 35mm (model # 123.10.35.60.01.001)

Constellation Double Eagle 1513 = 38 mm

Constellation Double Eagle 1511 = 35 mm

Max torque and breakdown toarque are the same...,.the point at which a motor will stop/stall.

The total current flowing in the three resistors,

i = 110 V / r(eq); where r(eq) is the equivalent resistance of the three parallel resistors.

r(eq) = 1/[(1/20) + (1/60) + (1/80)] = 1 / 0.079 ohms = 12.63 ohms.

i = 110 V / 12.63 ohms = 8.71 amps.

revamped of public distribution system means that govt. is doing or has done how many changes in the public distribution system for the poor society of the india.some of the examles of are mid day meal scheme,annapurna scheme, etc.

To supply the bell, because the latter has a rated voltage that's lower than the mains.

a high power, often class C amplifier.