Used primarily in industrial facilities to provide power for three-phase motor loads, and in utility power distribution applications. Nominal service voltages of , , , , and higher are typical.
Also known as a high-leg or wild-leg delta system. Used in older manufacturing facilities with mostly three-phase motor loads and some volt single-phase lighting and plug loads.
Similar to the Three Phase Three Wire Delta discussed above but with a center-tap on one of the transformer winding to create neutral for volt single-phase loads.
This service is thankfully less common than all the others found above. This service is common in older facilities that only have small 3-phase loads. It costs the utility less to supply this because only 2 transformers are needed on the utility pole. If you run into a service like this you have to be very careful with your solar system design. It is not uncommon for solar grid connected inverters to require a neutral connection on their output.
If that is the case this inverter will check voltages not only phase to phase but also phase to neutral. As per UL there is a tight voltage tolerance allowed so the high leg will prevent the inverter from ever starting. Another solution for small solar systems is to use a single phase inverter connected to Phase A and Phase C, this avoids the high leg and it till operate.
If the system is larger using a 3-phase inverter is best, typically these inverters start at 15kW in size so if you can find one that will operate V 3-phase Delta this might work. I purposely say might because you have to check with the utility. Antigua and Barbuda. Balearic Islands. British Virgin Islands. Burkina Faso. Burma officially Myanmar.
Canary Islands. Cape Verde. Cayman Islands. Central African Republic. For proper installation of any other three phase device s , read carefully the user manual before wiring for commercial supply systems and applications. Please follow the National Electric Codes i.
NEC wiring color codes or other local area color codes. Keep in mind that do not use green, green with yellow stripe or a bare conductor for those wires which carry voltage. Only and only use copper wire to reduce the resistance and heat instead of aluminum wires in the main panel box wiring. In addition, Hot, Phase and Line s represents the same thing i.
Disconnect the power source and make sure it is really swathed OFF before servicing, repairing or installing electrical equipment. To do so, switch off the main switch in the main panel box. Never stand or touch wet and metal parts while repairing or installation. Read carefully all the cautions and instructions and follow them strictly while doing this tutorial or any other work in practical related to electrical works.
Always, use the right size cable and wire , proper size outlets and switch and suitable size of circuit breakers. You may also use the Wire and Cable size calculator to find the right gauge size. Never ever try to play with electricity as it is dangerous and can be fatal without proper guidance and care. Do the installation and repairing work in presence of experienced persons having vast knowledge and good practice who knows how to deal with electricity.
Doing your own electrical work is dangerous as well as illegal in some cases.
0コメント