Advantages of a Y-Y transformer
Advantages of a Y-Y transformer
This post got my curiosity boiling so I starting doing a little digging as the transformer in the OP appeared to be Y connected primary.From the attached quote copy, I guess thats right, as it would keep things in line to help the inverter do it's thing without disruption IMO.
Another thing about this post was the word "combiner" kinda gave me fits but it turned out to be what I thought just a simple old bus box with multiple input sources and one output source.(I guess theret could be more than one output if there was any inverter capacity left over
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Advantage of Y-Y Connection:
No Phase Displacement: The primary and secondary circuits are in phase; i.e., there are no phase angle displacements introduced by the Y-Y connection. This is an important advantage when transformers are used to interconnect systems of different voltages in a cascading manner. For example, suppose there are four systems operating at 800, 440, 220, and 66 kV that need to be interconnected. Substations can be constructed using Y-Y transformer connections to interconnect any two of these voltages. The 800 kV systems can be tied with the 66 kV systems through a single 800 to 66 kV transformation or through a series of cascading transformations at 440,220 and 66 kV.
Required Few Turns for winding: Due to star connection, phase voltages is (1/√3) times the line voltage. Hence less number of turns is required. Also the stress on insulation is less. This makes the connection economical for small high voltage purposes.
Required Less Insulation Level: If the neutral end of a Y-connected winding is grounded, then there is an opportunity to use reduced levels of insulation at the neutral end of the winding. A winding that is connected across the phases requires full insulation throughout the winding.
Handle Heavy Load: Due to star connection, phase current is same as line current. Hence windings have to carry high currents. This makes cross section of the windings high. Thus the windings are mechanically strong and windings can bear heavy loads and short circuit current.
Use for Three phases Four Wires System:As neutral is available, suitable for three phases four wire system.
Eliminate Distortion in Secondary Phase Voltage: The connection of primary neutral to the neutral of generator eliminates distortion in the secondary phase voltages by giving path to triple frequency currents toward to generator.
Sinusoidal voltage on secondary side: Neutral give path to flow Triple frequency current to flow Generator side thus sinusoidal voltage on primary will give sinusoidal voltage on secondary side.
Used as Auto Transformer: A Y-Y transformer may be constructed as an autotransformer, with the possibility of great cost savings compared to the two-winding transformer construction.
Better Protective Relaying: The protective relay settings will be protecting better on the line to ground faults when the Y-Y transformer connections with solidly grounded neutrals are applied.
The Old Man
Advantages of a Y-Y transformer
This post got my curiosity boiling so I starting doing a little digging as the transformer in the OP appeared to be Y connected primary.From the attached quote copy, I guess thats right, as it would keep things in line to help the inverter do it's thing without disruption IMO.
Another thing about this post was the word "combiner" kinda gave me fits but it turned out to be what I thought just a simple old bus box with multiple input sources and one output source.(I guess theret could be more than one output if there was any inverter capacity left over
.Advantage of Y-Y Connection:
No Phase Displacement: The primary and secondary circuits are in phase; i.e., there are no phase angle displacements introduced by the Y-Y connection. This is an important advantage when transformers are used to interconnect systems of different voltages in a cascading manner. For example, suppose there are four systems operating at 800, 440, 220, and 66 kV that need to be interconnected. Substations can be constructed using Y-Y transformer connections to interconnect any two of these voltages. The 800 kV systems can be tied with the 66 kV systems through a single 800 to 66 kV transformation or through a series of cascading transformations at 440,220 and 66 kV.
Required Few Turns for winding: Due to star connection, phase voltages is (1/√3) times the line voltage. Hence less number of turns is required. Also the stress on insulation is less. This makes the connection economical for small high voltage purposes.
Required Less Insulation Level: If the neutral end of a Y-connected winding is grounded, then there is an opportunity to use reduced levels of insulation at the neutral end of the winding. A winding that is connected across the phases requires full insulation throughout the winding.
Handle Heavy Load: Due to star connection, phase current is same as line current. Hence windings have to carry high currents. This makes cross section of the windings high. Thus the windings are mechanically strong and windings can bear heavy loads and short circuit current.
Use for Three phases Four Wires System:As neutral is available, suitable for three phases four wire system.
Eliminate Distortion in Secondary Phase Voltage: The connection of primary neutral to the neutral of generator eliminates distortion in the secondary phase voltages by giving path to triple frequency currents toward to generator.
Sinusoidal voltage on secondary side: Neutral give path to flow Triple frequency current to flow Generator side thus sinusoidal voltage on primary will give sinusoidal voltage on secondary side.
Used as Auto Transformer: A Y-Y transformer may be constructed as an autotransformer, with the possibility of great cost savings compared to the two-winding transformer construction.
Better Protective Relaying: The protective relay settings will be protecting better on the line to ground faults when the Y-Y transformer connections with solidly grounded neutrals are applied.
The Old Man
