Is surge current the same as short circuit current?
Not usually, but it may depend on the context. For instance, surge current might be used for a generator that is going to start a motor. Motors draw high current as they start, then the current drops to a normal level, called RLA, or running load amps. Generators have a watt rating for continuous operation called running watts, but they also have a 'surge' rating. You might see a generator listed as a '6000/5200 watt. The 6000 watts is the 'surge' rating. This means the generator can supply 6000 watts for a few seconds, such as might be needed to start a motor, but cannot supply more than 5200 watts continuously. Short circuit current on the other hand simply means how many amps will flow instantaneously if you drop a wrench across the two wires! For a normal utility power service, the short circuit current, also called fault current, can be several tens of thousands of amps, even though the main breaker is only a couple hundred amps.
A surge resistor is a resistor installed in a circuit to prevent a "surge" when conditions arise where a surge might occur. That might be a bit wordy, but that's the answer. Let's look at an instance where a surge resistor is used and see how it works. There are a number instances where energizing a circuit is followed by a surge of current. Like almost all the time. When that circuit "comes on" after…
With a surge protector. The surge protector opens the circuit if a surge is detected. The third "pin" is connected to a ground wire to protect the circuit from a short and to dissipate "stray" charges. Overload breakers protect users and equipment from overloads , usually caused by shorts, by heating up and opening the circuit.(same as a surge protector.)
Can a numerical relay give protevtion to over current over voltage and short circuit current at the same time?
Current equals voltage divided by resistance in a DC circuit, or I=V/R (A similar relationship applies to AC.) The "original" circuit has the resistance of the wire plus the resistance of the load. The short circuit only has the resistance of the wire up to the point of the short circuit. In the equation I=V/R, less resistance with the same source voltage results in higher current.
The term, 'overcurrent', describes either an 'overload current' or a 'short-circuit current'. An 'overload current' is a current that is higher than a circuit's 'rated current'. For example, if you have too many loads plugged into the same circuit, then the resulting current is an 'overload current'. A 'short-circuit current' is a large current resulting when a line ('hot') conductor accidentally makes contact with either a neutral conductor or an earth (ground) conductor.
In series circuit why current drop beceause according to kichroff law cuurent remain same in series circuit?
Current in a series circuit travels in one path. This is because a series circuit is only one path. current in a series circuit stays the same thoughout the circuit this means that if in the beginning of the circuit there are 2 amps of current there will be the same ammount of current in the middle and in the end of it. if you don't understand this please tell me and ill explain in…
How can the synchronous impedance and armature resistance can be determined in a synchronous generator?
synchronous impedance can be calculated by performing oc test and sc test. by oc test,since the armature current is zero Vt=Ef . in short circuit test ,entire emf is consumed in circulating the short circuit current Isc,through the synchronous impedance. Zs=Ef/Isc.= (open ckt. terminal voltage for a certain field current)/(short ckt. current at the same field current)
A fundamental property of a series circuit is the current is the same anywhere in the circuit. By inserting the ammeter in series with the load, you guarantee that the current measured by the meter is the same as the current through the load (which is what you are trying to measure). If you were to connect the ammeter in parallel with the load, you would be creating a second current path, from the supply…
A parallel circuit has two elements side by side. In parallel the current is divided between the elements meaning they do not necessarily have the same current. A the elements in a parallel circuit do see the same voltage. In a series circuit both elements see the same current but will have different voltages across them.
Why is it that the current flowing through a series circuit is the same in all parts of the circuit?
It is difficult to state accurately, the question "why" in this type of answers format. You need to look up Kirchoff's Laws to get a complete comprehension of why parallel and series electrical circuits act as they do. There are many sites that give excellent answers to why, about current flows in electrical parallel and series circuits.
An ammeter reads the current that is flowing through a branch of a circuit. If there is a break within that same branch of the circuit, current will not be able to flow through that branch of the circuit as it forms an incomplete loop, so the ammeter will read 0 A of current. If there is a break in a circuit in a branch that is not connected to the ammeter however, the ammeter…
In any series circuit, there is one and only one path for current flow. All the current flowing in the circuit will flow through all of the devices in that circuit. A break at any point in the circuit will cause current flow to cease. Lastly, it is current that is the same at any point in the circuit where we'd care to measure it.
Short circuit voltage is the voltage that has to be applied to the primaries of a transformer, so that the nominal current flows through the secondaries, when they are shorted. This value is important, if transformer secondaries shall be used in parallel. Ideally all transformers with parallel secondaries should have the same short circuit voltage. When their short circuit voltages are different, the transformer with the lower short circuit voltage will be loaded more than…