At design of the new house it is necessary to define at once what in it will be used network – three-phase or single-phase. At the big power consumptions or use of three-phase consumers of current (industrial electric stoves and devices with powerful engines) the special power line will be more preferable. However its installation will require additional efforts and the specific equipment.
It is required to you
- - calculator;
- - plan of the house;
- - sheet of paper;
- - handle.
Instruction
1. Define the place of input of voltage cable on the plan of the house. Near the place of input define installation site of the three-phase counter and special three-phase distribution panel. Usually such boards have the strengthened zero blocks and in them bigger distance between fastenings of time cut-outs (automatic machines).
2. For the correct determination of number of networks of single-phase current group them, proceeding from the total power of at the same time included consumers of single-phase current. When calculating protect each single-phase network one automatic machine. Group three networks of single-phase current in one network of three-phase current.
3. Important! Total power of consumption in each single-phase network has to be approximately identical. In that case the three-phase network to which these single-phase networks are connected will be balanced. Respectively voltage surges in single-phase networks at changes of loading will be minimum.
4. Example: the two-storeyed house, is bath with the electric oven in the yard – Kamenka and garage in which electric oil heaters of heating are installed. In the furnace – Kamenka use of six TENOV which connect star in two three-phase sections on 3 TENa is reasonable. For fast warming up of stones in such furnace both sections join. After warming up one section is disconnected, and the second maintains temperature of stones. In garage also use three-phase power supply for heating. In this case to sockets where heating radiators are included, connect different phases.
5. Group supply circuits of lighting and the socket for other consumers of current in the house in different single-phase networks. In that case at accident in one network two others will be efficient. One single-phase network separation to each room will be serious error. The situation when consumers of current are included only in one room is in that case possible and disbalance of currents, so and tension between phases will appear. At the insufficient section of zero conductor on input there can be break of "zero" and there will be "distortion" of phases when on phase with big consumption of current tension strongly decreases, and on phases with smaller consumption of current tension strongly increases.