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Explain differancnce between instrument current transformer and measuring current transformer?
Current transformer is a device used to measure the flow of current through a power system and the measured current is inputted to a protective relay system. It is used to detect system malfunction. Current transducer is a device used to measure AC and DC current based on the halt-effect technology.
Explain current shunt negative feedback amplifier?
describe current-shunt negative feedback as applied to operational amplifiers, including derivations of the gain relation for each type of negative feedback.
Explain very large transformers are sometimes designed not to have optimum regulation properties in order for the associated circuit breakers to be within reasonable size?
I'm not sure this is true. "Regulation" has to do with how the transformer's terminal voltage behaves under different loading scenarios - under heavy load, the voltage is typically dragged down some; if the transformer regulation is "good", it will not be impacted too much. Furthermore, to offset this, many transmission to distribution transformers have load tap changers which effectively add or remove windings from the secondary side (typically), allowing manual or automatic regulation as load increases and decreases. Transmission level transformers often do not use LTC, and thus regulation is more limited (these are also usually much larger transformers). The terminal voltage could fluctuate then to +/- ~5% of nominal. Circuit breakers, therefore, must be sized for the maximum voltage expected (what I have seen spec'd is 105% nominal), and maximum fault current expected. I don't think you can under size the circuit breaker to operate on a lower voltage simply because under heavy loading voltage might be lower than ideal.
Explain briefly about LVDT with working and neat diagram?
First off, LVDT stands for linear variable differential transformer. The principle of the LVDT is that the physical energy is converted into electrical signals.
What is the power factor in pure inductors explain?
The power factor (cosine of phase angle) of pure inductor is zero because the phase angle between current and voltage is 90 degrees .If the value is substituted in the formula It will be zero.
