Now in each house there is set of the devices which are powered from the power supply network. However it is frequent, and especially in winter time, owners of all this household Arsenal face serious problem: knocking-out of automatic traffic jams on the counter. The reason of it is in power supply network overload. That similar trouble did not happen, it is necessary to count the power consumption of electric devices and to connect them in the power supply network via the stabilizer.
It is required to you
- - phasemeter;
- - instructions to electric devices;
- - calculator.
Instruction
1. Pay attention to what devices - have consumed electrical energy have two types of power: active and reactive. The distinctive feature of active loading is that the device turns all consumed electric power into heat. Representatives of this group: electric kettles, irons, boilers, boilers and other electric devices. Respectively all other devices which are powered from the power supply network and not turning electricity into heat belong to the second group, for example, the electric motor.
2. Remember that the ultimate power of devices and active power are closely interconnected among themselves. Their dependence is expressed in formula: Ra = cosφ*P, in which P - indicator of ultimate power, Ra – value of active power, and cosφ – power factor (it can be determined by the phasemeter, however in certain cases it is not necessary to do it as producers or on the back panel of its body specify cosφ value for this specific device in the passport of the device). The indicator of active power can be found in the instruction attached to the device. Having two sizes (power factor and value of active power), calculate ultimate power on each electric device used at home relating to the first group.
3. Carrying out calculation of ultimate power of electric devices, do not lose sight of one important point: all devices at the heart of which there is compressor, for example, the pump or the fridge at inclusion consume several times more energy, than in operating mode. So, increase passport value of power of these devices by 5. Monitors and personal computers have starting currents too: their value exceeds nominal indicators three times.
4. Summarize the received indicators of ultimate power on the separate used devices.