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What will happen on the regulation if a transformer has a very low impedance?
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Compared to bipolars FETs have-a high input impedance b low input impedance c same input impedance?
FET s have very high input impedance when compared with Bipolar transistors.
Why is voltage regulation important in transformer?
the transformers are used to step down the supply voltage:) power supply kit is mostly used for electronic equipment... electronic equipment operate in low volatge, for that purpose we using transformers in the power supply:) with regards sakthivel lect/EEE
Why the current increases upto resenance frequency and decreases there after in a series LCR circuit?
At resonance, the L and C impedance cancels out, so the current can be calculated based on the resistance and applied voltage. Imagine increasing frequency of the supply from 0 Hz to very high. At low frequency, the impedance of the inductor is ~0 (defined as Zl = w*L*j), and the impedance of the capacitor is very large (defined as Zc = 1 / (w*C*j)). As you increase the frequency, the impedance of the capacitor will decrease, as the impedance of the inductor increases. At some point (the resonant frequency), these two will be equal, with opposite signs. After crossing the resonant frequency, the inductor impedance will continue growing larger than the capacitor impedance until the total impedance approaches infinite.
What are the properties of an op-amp?
Properties of an op-amp are as follows: 1.Very high open loop gain which remains constant over the frequency range in which the device is to be used. 2.Very high input impedance to minimize the current drawn by the circuit with little losses. 3.Very low output impedance 4. They are stable, i.e. not liable to burst into parasitic oscillation. 5. They are free from drift caused by ambient temperature changes.
Which machine have very less losses in electrical?
Transformer
What effect does transformer has a very low impedance on short circuit current?
the short ckt curent will be very high.
Fundamental principle of current transducer?
The basic principle of current transformer is same as that of the power transformer. Like the power transformer current transformer also contains a primary and a secondary winding. Whenever an alternating current flows through the primary winding alternating magnetic flux is produced, which then induces alternating current in the secondary winding. In case of current transformers the load impedance or "burden" is very small. Therefore the current transformer operates under short circuit conditions. Also the current in the secondary winding does not depend load impedance but depends on the current flowing in the primary winding.
Why should core saturation of a conventional impedance matching transformer be avoided?
With the possible exception of a variable reluctance transformer, you should always avoid core saturation of any type of transformer. When saturated the magnetic characteristics of the core material is radically changed and the coupling coefficients will be very different. Additionally, many transformers can overheat and be damaged.
Effect of winding resistance with respect to EHV transformers voltage levels and their MVA rating?
The MVA rating will have an effect on the winding resistance - the higher the rating, the bigger current flows, thus the larger winding wire must be, which lowers the resistance. Generally, EHV transformers impedance (the resistance value you're thinking of) is specified when ordering the transformer, and can range from 4-20% (on the transformer base rating). When heavily loaded, on a weak system (high source impedance), the impedance of the transformer can impact the voltage level negatively (cause the voltage level, typically on the low side, to be less than desirable. I don't believe this is a serious concern, or the main reason to specify one impedance value versus another. Usually they are specified for cost, and other reasons (lower impedance must be able to withstand much more mechanical stress, while very high impedance may not provide enough fault current). On the EHV system, loads are typically "a ways away", and capacitor banks, inductor banks, and generators can be used to get the power to where it needs to go. Usually when it gets down to the loads that use it, it must go through at least one transformer that has an LTC (load tap changer) that can make corrections for any degradation in voltage. Often transformers with LTC's on the low sides have multiple taps on the high side as well to accommodate location in electrically weak locations. Furthermore, recently I've seen a lot of "musical transformers" activities going on (moving one transformer from one site to another); these transformers have different impedances, and are put in drastically different locations (electrically). I have not heard anyone scream foul based on the transformer impedance causing voltage issues. Disclaimer: My experience with transformer impedance choosing is not from a transmission planning perspective; my job does not usually entail dealing with voltage regulation. The planning people may do modelling that I do not know about to help in specification of impedance values.
What happen if the iron core is replaced by gold in the case of transformer?
You will have a very expensive but worthless transformer. Gold is not a ferromagnetic material, so it will not contain the magnetic flux needed to link the separate windings.
Compared to bipolars FETs have-a high input impedance b low input impedance c same input impedance?
FET s have very high input impedance when compared with Bipolar transistors.
What are the main differences between FETs and BJTs in terms of input impedance?
FET has very high input impedanceBJT has very low input impedance
Why input impedance of any amplifier should very high?
To get all the audio voltage from a source to a target without loss you need voltage bridging, that is a relative low output impedance to a higher input impedance. Usualy the input impedance is at least ten times higher then the output impedance.An input impedance is called also a load impedance or an external impedance.An output impedance is called also a source impedance or an internal impedance.
Why is voltage regulation important in transformer?
the transformers are used to step down the supply voltage:) power supply kit is mostly used for electronic equipment... electronic equipment operate in low volatge, for that purpose we using transformers in the power supply:) with regards sakthivel lect/EEE
What is the impedence?
Impedance is the complex form of resistance. Impedance takes into account capacitance and inductance in a circuit as well. Impedance can be represented as resistance as a function of frequency.See link.AnswerImpedance is not a 'complex form of resistance'. It is the vector sum of a circuit's resistance and reactance. In electrical engineering, 'resistance' has a very specific meaning, and cannot be used to denote 'opposition'.
What is instantaneous over current relay?
Instantaneous over current relay, which operates very fast with no intentional time delay and the operating time of these relay can be as low as 0.01sec . These relay operates only when the impedance between the relay and the source zsis very small compared to the impedance to the impedance of the protected section zl .
Why the current increases upto resenance frequency and decreases there after in a series LCR circuit?
At resonance, the L and C impedance cancels out, so the current can be calculated based on the resistance and applied voltage. Imagine increasing frequency of the supply from 0 Hz to very high. At low frequency, the impedance of the inductor is ~0 (defined as Zl = w*L*j), and the impedance of the capacitor is very large (defined as Zc = 1 / (w*C*j)). As you increase the frequency, the impedance of the capacitor will decrease, as the impedance of the inductor increases. At some point (the resonant frequency), these two will be equal, with opposite signs. After crossing the resonant frequency, the inductor impedance will continue growing larger than the capacitor impedance until the total impedance approaches infinite.
