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This might help you. First and foremost is the information the manufacturer puts on the nameplate of the motor. Second, the generic amperage can be found on motor charts that are on the internet. Third you can use a formula to find the approximate amperage. HP = Amps x Volts x 1.73 x pf/746. Transposed for Amperage, Amps = HP x 746/Volts x 1.73 x pf. Use power factor = .9 For estimating a 10 HP motor running on 208 volts. Amps = 10 x 746/ 208 x 1.73 x .9 = 7460/323.85 = 23.03 amps. See how much easier it is to read the nameplate.
What else can I help you with?
Is rms is line current or phase current?
RMS (root mean square) value can refer to either line current or phase current, depending on the context of the electrical system being discussed. In a three-phase system, the RMS line current is the current flowing in the lines connecting the power source to the load, while the RMS phase current is the current flowing through each phase of the load. For balanced loads in a three-phase system, the RMS line current and phase current have specific relationships, but they are distinct concepts.
Why is important for three phase supply voltage to be in-phase?
The phase voltages (i.e. line-to-neutral in a 4-wire system, or line-to-line in a 3-wire system) of a three-phase system are displaced from each other by 120 electrical degrees. Each phase voltage, in fact, is rarely in phase with its phase current, as the phase-angle (the angle by which a phase current lags or leads its phase voltage) is determined by the load not by the supply.In general, most loads are resistive-inductive so the phase current usually lags the phase current.So, to answer your question, it's not important that a phase current is in phase with its phase voltage -if that is what you are asking.
How do you calculate current on delta to star transformer?
To calculate the current on a delta to star transformer, first identify the line current in the delta configuration (I_line). The phase current in the star (wye) configuration (I_phase) can be calculated using the formula: I_phase = I_line / √3. This relationship arises because the line current in a delta system is √3 times the phase current in a star system. Therefore, knowing the line current allows you to easily find the phase current in the star configuration.
What is the Phase resistance of 500 voltage?
Phase resistance refers to the resistance encountered by current in a single phase of a multi-phase system, such as a three-phase electrical system. It is not directly determined by the voltage level, like 500 volts, but rather depends on the characteristics of the load and the conductors in the circuit. To determine the phase resistance, one would typically need to know the current flowing through the phase and the power factor of the load. If you have specific details about the load or system, I can help calculate or explain it further.
What is difference and ratio should be in neutral CT and phase CT?
In a neutral current transformer (CT), the primary function is to measure the neutral current in a three-phase system, which helps in detecting ground faults and unbalanced loads. In contrast, a phase CT measures the current flowing through a specific phase conductor. The ratio in a neutral CT is typically higher to accommodate the combined current from all phases, while phase CTs have a ratio that reflects the current of their respective phase, ensuring accurate monitoring and protection for that specific phase.
What is current in three phase and single phase?
All current is the passage of electric charges from one terminal to another through a conductor so there is no real difference in the type of current that flows in a 3 phase system compared to a single phase system.
Why neutral cross section is half the phase in three phase cable while it has to carry current of summation of all phase..?
The current carried by the neutral of a three phase four wire system is the un balanced current. If the three phase system was completely balanced on all three phases there would be no need for a neutral, eg a three phase motor. This neutral current will be less that the phase current so a reduction in the neutral size is allowed.
What is the limit or range of the neutral current in an unbalanced three phase system for it to be regarded as faulty?
The limit or range of the neutral current in an unbalanced three phase system is the third harmonic in single phase non-linear load current is the major contributor to neutral current.
What are the advantages of providing alternating current supplies in three phase form over single phase form?
Over all losses are less in three phase AC system compared to 1 phase. For a given load (KW) 1 phase system would draw more current
How do you calculate the total input current from a 3-phase power source when the current from each phase is known?
Add them upAnswerThere is no 'total' current in a three-phase system. The current flowing in each line (not 'phase') is considered separately. And you most definitely don't 'add them up'!
What is the difference between Load Current Line Current and Phase Current?
A load current is a current drawn by an electrical load. In other words, it is the current flowing from the source to the load.For a single-phase system, a line current is a current flowing through the line, or 'hot', conductor, while the current through the neutral conductor is called the neutral current.For a three-phase system, the three 'hot' conductors between the load and the source are called 'lines' and, so, the currents passing through them are called 'line currents'. For a three-phase system, loads are either connected between line conductors (delta-connected system) or between each line and the neutral (star- or wye-connected system), and represent the phases -so the currents passing through the loads are called 'phase currents'.For a balanced three-phase system, the line current is 1.732 times the value of a phase current, where the phases (loads) are connected in delta. For phases (loads) connected in star (or 'wye') the line current is numerically-equal to the phase currents.
Why is important for three phase supply voltage to be in-phase?
The phase voltages (i.e. line-to-neutral in a 4-wire system, or line-to-line in a 3-wire system) of a three-phase system are displaced from each other by 120 electrical degrees. Each phase voltage, in fact, is rarely in phase with its phase current, as the phase-angle (the angle by which a phase current lags or leads its phase voltage) is determined by the load not by the supply.In general, most loads are resistive-inductive so the phase current usually lags the phase current.So, to answer your question, it's not important that a phase current is in phase with its phase voltage -if that is what you are asking.
Why the neutral cable takes high current than the phase lines in three phase installation?
In a balanced three-phase system, the current in the neutral wire should ideally be minimal as the three phase conductors carry equal and opposite currents that cancel out in the neutral wire. However, if the loads are unbalanced, the neutral wire may have higher current due to the uneven distribution of power among the phases. This can happen when loads on each phase are different or when single-phase loads are connected between a phase and neutral, leading to increased neutral current.
Why set an overload relay to full load current divide by root three in a star delta starter?
In a Wye/star system the overloads look at the phase to neutral/ground current; not phase to phase current. Which is always calculated as root three or 1.73205.............etc. Therefore the overloads have to be set to the phase to neutral/ground current.
What is phase current?
A phase current is the current passing through a phase, whereas a line current is the current flowing through a line.
Why is the neutral wire thinner in overhead 3-phase AC transmission line?
A smaller neutral wire in a three phase system can be used because it does not carry the full line current. It carries the unbalanced current of all three leg loads. This is one reason that three phase loads on a distribution panel should be equalized as much as possible to reduce the current on the neutral.
Is house current fit for single or three phase motor?
House current is single phase.AnswerIt depends on the system supplying your residence. Most are single phase, but some, such as here in Cyprus, have a three-phase supply as standard.
