Grounding transformers are used for obtaining a grounded neutral on three phase three wire systems providing a return path for zero sequence current generated by the loads in the system or by the fault currents. A zigzag transformer is a special purpose transformer with a zigzag or interconnected star winding connection such that each output is the vector sum of two 2 phases offset by 120.
3 Phase Transformer 14 Delta Zigzag Star Connection Part 2
Zig zag transformer connection diagram. Zigzag transformer has six coils in which three. Less costly for grounding purpose. The zigzag transformer contains six coils on three cores. If there is a zero sequence impedance of transformer the power and leakage impedance rating of the transformer may be calculated. The zigzag connection provides the same advantages as the y connection. The most common connection used in grounding transformers is the zig zag connection.
Zigzag transformer zigzag transformer is also known as the interconnected star connection. To perform harmonic. This type of connection of transformer is not suitable for transforming power. Advantages of zig zag transformer. Advantages of zig zag transformer. Zig zag connection is the combination star and delta connection and it has the both advantage of a star and delta.
It is used in power system zigzag connection has some of the features of the stary and delta connections. The zigzag connection provides the same advantages as the y connection. Zigzag transformer is a special purpose transformer. Both the windings of secondary are of equal turns. It is used to create a ground for the floating system and also to filter 3rd harmonics in 3 phase ac power supply system. The windings a1a2 a1a2 and a3a4 are wound on the same limb of the core hence they are all colored red.
Less costly for grounding purpose it is typically the least costly than y d and scott transformer. It is typically the least costly than y d and scott transformer. The zigzag connection in power systems to trap triple harmonic 3rd 9th 15th etc currents. Third harmonic suppression the zigzag connection in power systems to trap triple harmonic 3rd 9th 15th etc currents. Zig zag transformer for grounding system rev1 page 2 the zero sequence impedance of the zig zag transformer can contribute to limit the single line to ground slg fault current. The zigzag transformer is a special type of 3 phase transformer.
The grounding transformer is commonly referred to by this connection type the zigzag transformer. It is used as a grounding transformer creating a missing neutral connection from an ungrounded 3 phase system to permit the grounding of that neutral to an earth reference point. What is zig zag connection. The first coil on each core is connected inside out to the second coil on the. Zig zag transformer winding outer layout. In zig zag transformer connection there are three windings on each of the three limbs of the core one for primary and two for secondary.
Figure 1 grounding transformer connections zig zag and grounded wye delta figure 2 shows how a grounding bank supplies current to a ground fault. The zig zag connection is the most widely used grounding transformer.
Gallery of Zig Zag Transformer Connection Diagram
