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maximum demand is measured in kva because current drawn is dependent on power factor for the same load and current drawn is calculated with kva
Wiki User
∙ 14y ago
Wiki User
∙ 11y agoBecause the product of load current and supply voltage is expressed in volt amperes, not in watts.
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Why transformer rating is not given in kw?
Transformer rating is based on the maximum temperature a transformer can run at. This temperature is dictated by the amount of current flowing through the transformer windings. This is why transformers are rated in KVA (voltage * current), not kW - it doesn't matter what the phase relationship is between voltage and current, just the magnitude of the current.
What is maximum motor kw that can be started on direct on line starter?
20 kw
Why the transformer rating in kva why not in kw?
A transformer has separate ratings for maximum voltage and maximum current. Both limits must be observed. The maximum voltage is set by the magnetic flux density in the core, while the current limit is set by the size of the wire used in the primary and secondary windings. Multiplying the two together gives the VA or kVA rating.
How to choose rating of contactor in star delta starter?
As well as motors, contactors also have kW and Ampere ratings. Have a look on the name plate of your motor and you will see its maximum current draw (amps). Select a contactor with a current rating greater than this.
What is the difference between KVA and KW of a transformer?
Transformer power is given by P=V*I which takes the unit of KVA while that of KW has energy term which is not produced by the transformer.It only steps up or down the voltage.Answer:In a pure D.C. circuit, KW = KVA. However, in any A.C. circuit, there is real power {KW} and apparent power {KVA}, due to the voltage and current being out of phase. Power Factor is the ratio of KW to KVA. Transformers are rated in both KVA and PF. Multiplying the transformer KVA rating times the PF will yield KW.A transformer has separate ratings for maximum voltage and maximum current. Multiply the two together and that is called the VA rating, or kVA for larger transformers. So the transformer rating is independent of the power factor of the load.
What is the difference between maximum demand and conncted load?
Type your answer here... The sum of kW rating of all equipment connected to the supply is known as connected load. Where as when we run the plant or equipment in a sequence one by one or at a time the highest average reading of kW consumed during any 1/2 hour is considered as maximum demand during the month.
Definition of maximum demand?
MAXIMUM DEMAND (M.D.): -It is the greatest demand of load on the power station during a given period.I.e. The maximum of all the demands that have occurred during a given period (may be a day, may be an hour etc.).Need of maximum demand in Electricity bill?When the rate of electrical energy is charged on the basis of maximum demand of the consumer & the units consumed, it is called two-part tariff.In this total charge is divided into two.A) Fixed charge à depends on maximum demand of consumerB) Running charge à depends on no. of units consumedIt is measuring by installing maximum demand meter. Charges are made on the basis of maximum demand in kVA & not in kWMaximum demand used to be measured by a demand needle on the meter, that would actually store only a peak demand. When you start an electric motor, this peak can be very high for a second or two. For this reason, more modern meters calculate an average demand over some period of time (often 15 minutes), and the maximum of those average demands is used as the maximum demand for billing purposes.Billing by maximum demand allows the utility to bill for the cost of installing better wiring and transformers for customers with a large active demand (KW).Values other than KW can be measured the same way for other demand values.
How do you mention the kw rating in motor?
Motors are rated according to their output power, expressed in watts or kilowatts (or horsepower, in North America). This is because the motor's rating must be matched to the power requirements of its mechanical load.
Why transformer rating is not given in kw?
Transformer rating is based on the maximum temperature a transformer can run at. This temperature is dictated by the amount of current flowing through the transformer windings. This is why transformers are rated in KVA (voltage * current), not kW - it doesn't matter what the phase relationship is between voltage and current, just the magnitude of the current.
How many gallons does a generator use per hour?
Depends upon the Kw rating of the generator. The higher the Kw rating the more fuel will be used.
How can you convert the kva rating into kw rating?
kva*cos(phase angle)
What is maximum motor kw that can be started on direct on line starter?
20 kw
How do you calculate the dc circuit breaker rating for a given kw?
the given kw Divide by the your voltage
Why the transformer rating in kva why not in kw?
A transformer has separate ratings for maximum voltage and maximum current. Both limits must be observed. The maximum voltage is set by the magnetic flux density in the core, while the current limit is set by the size of the wire used in the primary and secondary windings. Multiplying the two together gives the VA or kVA rating.
What is the ionic product for water expressed in Kw?
Mol2let-1
How to choose rating of contactor in star delta starter?
As well as motors, contactors also have kW and Ampere ratings. Have a look on the name plate of your motor and you will see its maximum current draw (amps). Select a contactor with a current rating greater than this.
What is the difference between KVA and KW of a transformer?
Transformer power is given by P=V*I which takes the unit of KVA while that of KW has energy term which is not produced by the transformer.It only steps up or down the voltage.Answer:In a pure D.C. circuit, KW = KVA. However, in any A.C. circuit, there is real power {KW} and apparent power {KVA}, due to the voltage and current being out of phase. Power Factor is the ratio of KW to KVA. Transformers are rated in both KVA and PF. Multiplying the transformer KVA rating times the PF will yield KW.A transformer has separate ratings for maximum voltage and maximum current. Multiply the two together and that is called the VA rating, or kVA for larger transformers. So the transformer rating is independent of the power factor of the load.
