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We give the name ferroresonance to a type of overvoltage situation in 3-phase power systems that can occur when one of the phases in a loaded system opens. This puts a lot of "stress" on the other two phases, and in a system with a lot of distributed inductive and capacitive components, this is bad news. Overvoltage can break down insulation or simply "punch through" causing an arc. In either case, damage will occur. When a phase in interrupted, the other phases need to kick out, too, so that all phases of the circuit are unloaded at the same time. This will prevent the condition. Ganged breakers will do thid, that it, they'll kick out all phases at once. And sensors are placed on each of the phases so differential loads, when great enough, will trip the breakers and cause them to open. A link follows.
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Why capacitor banks are not recommend with generator sets?
A generator is a highly inductive device with low resistance. Capacitors are, well, capacitive. when you have an inductor near a capacitor, you can get ringing. This is known as ferroresonance. The capacitance and inductance form an LC tank circuit, which causes excessive overvoltages. Generators are typically high impedance grounded, which contributes to ferroresonance issues.
What is the effect of leading power factor on transformer?
that is to reduce the cost of the power plant.... Improving power factor(increasing the ration active/apparant power morethan 0.8) will increase the efficiency of uer system. Improving power factor denotes eleminating the recative power(which do no average work).... If u have more capacitive parts in uer system, the power you may need be really high when the capacitor is charging. But as it is in an a.c. system, used energy will be released and hence the average energy consumption of the cap is null. As in one instance iot absorbes energy, the electricity distributers must be able to generate such an high power which will incrrease their cost(eventhough the absorbed energy will be released)!!! Just by reducing the the reactive power, you can reduce the enery absorption. However to do so, you may have to use caps/inductors whcich will cost you a lot. Generally, electricity distributors say, "You must not reduce uer power factor than 0.8"... In some countries, distributors pay for the factries if there power factor is higher than a cirtain value(0.95).... -R-
Why capacitor banks are not recommend with generator sets?
A generator is a highly inductive device with low resistance. Capacitors are, well, capacitive. when you have an inductor near a capacitor, you can get ringing. This is known as ferroresonance. The capacitance and inductance form an LC tank circuit, which causes excessive overvoltages. Generators are typically high impedance grounded, which contributes to ferroresonance issues.
What does mean by ferroresonance?
Ferroresonance is a phenomenon that can occur in electrical systems when there is a combination of non-linear characteristics from inductive elements and capacitive elements, resulting in high voltages and potential damage to equipment. It can occur in power systems during switching operations or when equipment is disconnected or connected abruptly. Mitigation measures include the use of resistors, damping circuits, and proper system design.
Can you connect capacitor bank directly in outgoing of 1000 kva transformer.kva ic ratiting of transformer kilo volt ampere?
This may cause ferroresonance or strange over voltages when the transformer is switched if the cap bank isn't separately controlled (and switches separately). You may be able to do this, but if it is not typical it's always best to do careful analysis for possible problems.
Is it possible to have a voltage drop across the energy storage element greater than the supply?
Yes. For a condition called 'series resonance', if the resistance of the circuit is low compared with the inductive reactance and capacitive reactance, then the voltage drop across the capacitor can be VERY much higher than the supply voltage.
What is the effect of leading power factor on transformer?
that is to reduce the cost of the power plant.... Improving power factor(increasing the ration active/apparant power morethan 0.8) will increase the efficiency of uer system. Improving power factor denotes eleminating the recative power(which do no average work).... If u have more capacitive parts in uer system, the power you may need be really high when the capacitor is charging. But as it is in an a.c. system, used energy will be released and hence the average energy consumption of the cap is null. As in one instance iot absorbes energy, the electricity distributers must be able to generate such an high power which will incrrease their cost(eventhough the absorbed energy will be released)!!! Just by reducing the the reactive power, you can reduce the enery absorption. However to do so, you may have to use caps/inductors whcich will cost you a lot. Generally, electricity distributors say, "You must not reduce uer power factor than 0.8"... In some countries, distributors pay for the factries if there power factor is higher than a cirtain value(0.95).... -R-
