The equation for power in a three-phase system is given by the following equation:
P = 1.732 x line voltage x line current x power factor
So, to calculate the line current, we can manipulate this equation, as follows:
line current = power / (1.732 x line voltage x power factor)
As you make no mention of power factor, we shall assume the power factor is 1, and we also need to assume the 230 V you quote is a line voltage, so we can calculate the value of current as follows:
line current = 18 000 / (1.732 x 120 x 1) = 86.6 A
First of all, the time for which a generator runs has absolutely no effect on its power -power is simply the rate at which it produces energy. Secondly, the power provided by the machine depends on the power factor of the load, so unless you know that, you cannot determine how much power is provided. Finally, the correct symbol of kilovolt ampere is 'kV.A'. not 'KVA'.
75 Amps theoretically Need to know if the generator is 3 phase or single phase.
You will need a 50 kW generator for a single phase 120/240 volt service.
The following formula is used to find amperes when kilowatts are shown. kw x 1000/1.73 x E x pf. The term pf is the power factor value usually using a value of .9. 18000 watts is equal to 18 kWs. 18 x 1000/1.73 x 240 x .9 = 18000/374 = 48 amps.
Need to know what voltage the generator is outputing. The maximum voltage a 15kW generator will support at 200A is dependent on service voltage and configuration, the rated generator voltage, the power factor and the load frequency. If this is a typical service to a residential unit, eg. 220V single phase, then the generator will not be able to safely support 200A.
Yes. I have a several power generators for sale. Single phase, Three phase, Diesel and Petrol. What sort of power generator are you looking for exactly? Industrial, residential?
75 Amps theoretically Need to know if the generator is 3 phase or single phase.
The type of backup generator should match the type of utility service you receive. If your utility power is single-phase (almost all residences in the US are), then yes, your generator should be single-phase as well.
You will need a 50 kW generator for a single phase 120/240 volt service.
a generator is built in three phases
First house lighting systems are single phase not three phase. To connect a generator to the house lighting system for emergency power, it would take an electrician to do the job properly. The biggest concern would be to isolate the rest of the service from the main distribution supply service and then isolate the rest of the distribution panel loads from the lighting loads.
There is no such thing as a two phase load any more. Any two legs from a three phase system are classed as single phase. If this single phase load is connected across the generator it will induce an imbalance in the output voltages of the generator. This is one reason that single phase loads on a three phase generator should be shifted around to find the best possible balance.
We can convert a 3 phase ac motor into generator by changing phase sequence of the ac input cable of that motor
Typically copper conductors that provide a phase of electricity.
any more load will add to that phase ,over current protection will trip the generator.
how reversing an ac single phase induction motor to wark as induction generator
As the name implies, a motor-generator set utilizes an electric motor as the prime mover to drive a generator. The motor and generator can be mounted on a common shaft or they can be mechanically connected through a coupling, belt drive system or reduction gear.In all cases, the motor requires a source of power (from whichever electrical supply service is available) and it drives the generator to produce the required electrical output power. For instance, if a single-phase supply service is the only service available at a location, the generator's output could be three-phase ac which could be used to supply power to machinery which has three-phase motors, etc.If a site has equipment which requires only direct current the generator could be one that produces dc. That is a less common setup because a full-wave rectifier could easily be used to produce plain dc from ac, but a motor-generator set can still be used for very specialized applications which need highly accurate control of a dc motor under varying load conditions. The Ward Leonard Drive System is a specialized example of such a motor-generator set. (See the Related Link below for more information.)Nowadays, because high-power electronic inverter units are sold to produce a three-phase service from a single-phase service, motor-generator sets are used mainly for very specialized industrial sites, for engineering development and for scientific research applications.It should be noted that there is no need to use a motor-generator set or an inverter unit to produce single phase from three-phase because any one line of a star-connected three-phase service, along with a neutral wire connected to the central star point, can easily be used as a single-phase service.The Related Links below give a lot more information about motor-generator sets.
If the elevator has a single-phase motor, the diesel generator can also be single phase provided the voltage and VA ratings are compatible.