0
If impedance of power transformer is increase from 8 to 10 percentage then what will effect?
Wiki User
∙ 11y ago
if the designed value of percentage impedance is change, for general this should affect tow things
* if the percentage impedance is decrease this should increase the fualt level current
*if the percentage impedance is increase this should increase the transformer losses and tempreture rise
so the designed value of percentage impedance is determined according IEC if it is less than or equal 10% the margin should be + or_ 15%, if it is more than 10% the margin should be + or _ 15%
so the percentage impedance of this transformer is not accepted according IEC standers
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
What was the effect on the input impedance of lowering the operating frequency?
The input impedance should increase slightly for the lower frequency, when using a capacitive circuit.
Is loading effect more when load impedance is less then source impedance?
The higher the mismatch between the load impedance and source impedance, the higher the loading effect.
How does eddy current loss effect a transformer?
Eddy currents act to increase the temperature of a transformer's core above ambient temperature, resulting in a loss of energy through heat transfer -thus reducing its efficiency.
Why skin effect not act on the transformer?
Skin effect is a physical effect that operates on thick conductors. In a transformer the conductors are usually too thin for any substantial skin effect to occur.
How you can eliminate loading effect in amplifiers?
By increasing the input impedance of amplifier.
What is the effect of transformer impedance on short circuit current?
Short circuit current will increase a lot.
What is the effect of transformer impedance on regulation?
The lower the impedance, the lower the voltage drop across the transformer as it is loaded. This means regulation is better, since voltage variance is smaller.
What is the effect of low impedance transformer on regulation?
The lower the impedance, the lower the voltage drop across the transformer as it is loaded. This means regulation is better, since voltage variance is smaller.
What effect does transformer has a very low impedance on short circuit current?
the short ckt curent will be very high.
What was the effect on the input impedance of lowering the operating frequency?
The input impedance should increase slightly for the lower frequency, when using a capacitive circuit.
Is loading effect more when load impedance is less then source impedance?
The higher the mismatch between the load impedance and source impedance, the higher the loading effect.
How does eddy current loss effect a transformer?
Eddy currents act to increase the temperature of a transformer's core above ambient temperature, resulting in a loss of energy through heat transfer -thus reducing its efficiency.
Voltmeter DMM or VOM has the higher loading effect?
The VOM has the higher loading effect, because it has a lower impedance. It is typical for a VOM to have an impedance of 20K ohms per volt while the DMM has a fixed impedance of 10M ohms or 20M ohms.
What is the meaning of the term impedance?
it is combined effect of resistance and inductance
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.
Why skin effect not act on the transformer?
Skin effect is a physical effect that operates on thick conductors. In a transformer the conductors are usually too thin for any substantial skin effect to occur.
What effect does low impedance have on voltage regulation?
raised voltage output
