Delta connection

In the delta connection, the connections of the three strings of a three-phase equipment (e.g. three-phase motor , three-phase generator or three-phase transformer ) are connected to one another in the form of a triangle. The corner points of the triangle (u1, v1 and w1) are connected to the three phases (L1, L2 and L3) of the three-phase system.

Delta connection

In contrast to the star connection , the delta connection does not have a star point to which a neutral conductor (N) could be connected.

In Europe, the voltage in the low-voltage network is usually 400  V between any two outer conductors. The individual outer conductors have a voltage of 230 volts to earth due to the interlinking factor ( ). ${\displaystyle U=\mathrm {230\ V} \cdot {\sqrt {3}}\approx \mathrm {400\ V} }$

The delta connection is used, among other things, in powerful electrical machines . The star-delta starting circuit , for example, is used to start up these machines . Since the power in star connection drops to 1/3 of the power in delta connection (the resistances of the motor windings are unchangeable), high starting currents are avoided.

literature

• Electrical engineering expertise . 29th edition. Europa-Lehrmittel, Wuppertal 2014, ISBN 978-3-8085-3190-7 .