Into triangle connection (△ symbol) and a star connection (also known as Y-connected, the symbol Y).
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1, the trailing end of each load phase and neutral line N, respectively, and the head end of each load phase contact line constitute star connection. In electrical technology, we will take the form of a single-phase load voltage of 220V, 220V, such as lights, single-phase motor, the single-phase electric furnace. Electrical equipment are in a star connection into the circuit, the device should be considered uniformly distributed in a three-phase power supply phase line, three-phase load to maintain an equilibrium distribution. If so, the circuit breaker may trip open to show the load imbalance, the electrician should be noted that the initial operation point.
2, the load-called triangle (△) is connected, it is to the other end of the first phase of the three phases of the load contact. This load-connected, three-phase current, line current are three values are equal, the mutual phase difference of 120 ° three phase current, line current and the phase current is equal to the square root of 3 times.