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What the use of phase sequence indicator?
In indicator there is a led light source. It gives us the presence of the current source by indicate its light. If the phase of the indicator is not equal to the supply voltage then it can not give us the presence of current source by its led light off. If the phase of indicator is equal with the mane supply phase then its remaining bright and continuous gives us the indication of current source.ANSWER'Phase sequence' is the order, or sequence, in which each of the line voltages of a three-phase system reach their peak values. If 'normal' phase sequence is considered to be A-B-C (or R-S-T, etc.), then 'reverse phase sequence' would be A-C-B. Phase sequence is very important if, for example, you want to ensure that your three-phase motors rotate in the correct direction. So, after disconnecting them for maintenance, you can confirm the phase sequence of your incoming conductors by using a phase-sequence meter, before you reconnect that motor.
How many capacitors are use in a circuit?
Capacitors store charge. There are many applications for their use. There is no set amount of capacitors in a circuit since it is application dependent.
What is the use of capacitors in fire alarm circuit?
Fire alarm system may be having some electronic devices and cards, in which some capacitors are used. Capacitors are part of any electronic cards.
If capacitors dont use ac current then how and why are they used in most appliances?
Capacitors resist a change in voltage, proportional to capacitance and current. This is called capacitive reactance. As a result, a capacitor in an AC circuit will create a leading phase angle, current relative to voltage. This, for example, can be used to help start a motor by creating two magnetic fields, one leading the other.
What is use of decoupling capacitor?
to protect a circuit from damaging
Is there a single phase capacitor?
All capacitors fundamentally have two sides or "connections" so that any single capacitor will have two terminals. That is true whether capacitors are used in single phase (using one or more capacitors), or in three phase power (same number of discrete capacitors on each phase). The packaging of capacitors is mostly as "singles" having just two connecting wires or terminals, but certain applications - such as three-phase motor speed controllers - often use "blocks" of three or more capacitors, packaged together into one "body" or "casing". Those "capacitor blocks" have four or more connecting wires or terminals.
What the use of phase sequence indicator?
In indicator there is a led light source. It gives us the presence of the current source by indicate its light. If the phase of the indicator is not equal to the supply voltage then it can not give us the presence of current source by its led light off. If the phase of indicator is equal with the mane supply phase then its remaining bright and continuous gives us the indication of current source.ANSWER'Phase sequence' is the order, or sequence, in which each of the line voltages of a three-phase system reach their peak values. If 'normal' phase sequence is considered to be A-B-C (or R-S-T, etc.), then 'reverse phase sequence' would be A-C-B. Phase sequence is very important if, for example, you want to ensure that your three-phase motors rotate in the correct direction. So, after disconnecting them for maintenance, you can confirm the phase sequence of your incoming conductors by using a phase-sequence meter, before you reconnect that motor.
How do you check phase sequence?
It's outside the scope of this answer to go into the theory, but a 3 phase motor by convention normally rotates anticlockwise when viewed from the 'driven' end. To check phase sequence, the usual method is to use a phase sequence indicator. Originally these were like a miniature three phase motor encased in a hand-held device. If the flying leads were connected RYB, BRY, or YBR, the disc in the psi would rotate anticlockwise. If the flying leads were connected RBY, BYR, or YRB the disc would rotate clockwise. Nowadays, the mechanical aspect of the phase sequence indicator has been repalced with solid state devices that indicate on one of two leds if the sequence is c/w or ac/w. To check phase sequence you look for which phase out of the three phases peaks first. You could probably put each phase on an oscilloscope and see which one peaks first. Phase sequence is usually taken as positive anticlockwise from the reference voltage ( the phase that peaks the first).
How many capacitors are use in a circuit?
Capacitors store charge. There are many applications for their use. There is no set amount of capacitors in a circuit since it is application dependent.
Can you use 50volts 3300uf capacitors instead of 25volts 3300uf capacitors?
Yes.
How three phase directional relay operates?
You see the way a relay operates really is just simple physics. These physics are operated with the use of "Flux Capacitors". Flux capacitors are used in nearly every single circuit and have potential to break the space time continuim. The device containing the most potential of "Flux capacitors" is the Continuim Transfunctioner. A diagram of this ultimate device has been seen in a Documentary "Dude Where's my car?".
When does the main sequence star phase of a star end?
The "main sequence" is the region (on the HR diagram) for stars which burn hydrogen-1. Once stars use up most of their hydrogen-1 (and have significant amounts of helium-4), they leave the main sequence.
Why you use capacitors in lines?
Capacitors are connected in series with some lines (series compensated lines) and in parallel. Capacitors in parallel are used to prop up the voltage at that location by injecting reactive power onto the grid. Capacitors in series are used to cancel out some of the inductance of the line, which allows for more power to be transported through the line. Capacitors at load centers are often used for power factor correction, and are connected in parallel (line to ground). To achieve efficiency in a power delivery system it is most efficient to have the current and voltage in phase. Often the load is inductive hence the current lags the voltage (due to motors etc.). Capacitors are switched in and out of the transmission system to counteract this effect.
Which type of dielectric is used most often in variable capacitors?
The type of dielectric most often used in variable capacitors is air. Also, trimmer capacitors often use mica.
What is the use of capacitors in fire alarm circuit?
Fire alarm system may be having some electronic devices and cards, in which some capacitors are used. Capacitors are part of any electronic cards.
How do you use flip flops and logic gates to provide the proper sequence logic to sequentially energize the phase windings of a four phase stepper motor?
Unfortunately there isn't enough information to give you a complete answer. Which stepper motor are you using?
Why do you use capacitors on fan motors or blowers?
We use capacitor on fan motor or blower to create phase difference between two winding(Starting & running). This phase difference introduce starting torque on fan motor. Otherwise without capacitor the torque produced in positive Half cycle of AC supply is nullify by the torque produced in negative half cycle.
