Flexible voltage transformation system

A modular power transformer having a power rating greater than 100 MVA comprising:

• a plurality of transformer blocks each including:
• an enclosure,
• a first set of block terminals,
• a second set of block terminals, and
• a plurality of transformer modules located within the enclosure, each module including:
• a first set of module terminals,
• a second set of module terminals,
• at least one primary winding coupled to the first set of module terminals,
• at least one secondary winding coupled to the second set of module terminals, and
• a transformer core,
• wherein the primary windings of the transformer modules in one transformer block are coupled together between the first set of block terminals and the secondary windings of the transformer modules in the same transformer block are coupled together between the second set of block terminals and
• wherein at least one of the transformer modules includes the first primary winding, a second primary winding, a third primary winding, a fourth primary winding, the first secondary winding, a second secondary winding, a third secondary winding, and a fourth secondary winding, wherein the voltage ratio of the first primary winding to the second primary winding to the third primary winding to the fourth primary winding is 5:1:1:5, and wherein the voltage ratio of the first secondary winding to the second secondary winding to the third secondary winding to the fourth secondary winding is 5:1:1:5.

A method for assembling a modular power transformer comprising:

• selecting a plurality of transformer modules from a set of standardized transformer modules, each standardized transformer module including a primary winding, a secondary winding, and a core;
• assembling a plurality of transformer blocks by coupling sets of the selected plurality of transformer modules, the weight of each transformer block being equal to or less than 40 tons;
• separately transporting each transformer block to a remote location;
• and
• coupling each of the transformer blocks together at the remote location between an AC power source and a load to form the modular power transformer including a power rating greater than 100 megavolt-amperes (MVA) and
• wherein the set of standardized transformer modules includes a first standardized transformer module including the first primary winding, a second primary winding, a third primary winding, a fourth primary winding, the first secondary winding, a second secondary winding, a third secondary winding, and a fourth secondary winding, wherein the voltage ratio of the first primary winding to the second primary winding to the third primary winding to the fourth primary winding is 5:1:1:5, and wherein the voltage ratio of the first secondary winding to the second secondary winding to the third secondary winding to the fourth secondary winding is 5:1:1:5.

A matrix power transformer system comprising:

• a plurality of block assemblies each including a plurality of transformer modules, each transformer module including a primary winding coupled to an input and a secondary winding coupled to an output, the inputs of each transformer module in one block assembly being coupled together and the outputs of each transformer block being coupled together,
• wherein one of the secondary windings includes a plurality of taps structured to be selectively coupled to the output of the associated transformer module or another secondary winding of the associated transformer module,
• wherein each block assembly is structured to weigh less than 40 tons, and
• wherein the matrix power transformer system has a power rating greater than 100 megavolt-amperes (MVA), and
• wherein at least one of the transformer modules includes the first primary winding, a second primary winding, a third primary winding, a fourth primary winding, the first secondary winding, and a second secondary winding, wherein the voltage ratio of the first primary winding to the second primary winding to the third primary winding to the fourth primary winding is 5:1:1:5, and wherein the voltage ratio of the first secondary winding to the second secondary winding is 1:1.

A matrix power transformer system comprising:

• a plurality of block assemblies each including a plurality of transformer modules, each transformer module including a primary winding coupled to an input and a secondary winding coupled to an output, the inputs of each transformer module in one block assembly being coupled together and the outputs of each transformer block being coupled together,
• wherein one of the secondary windings includes a plurality of taps structured to be selectively coupled to the output of the associated transformer module or another secondary winding of the associated transformer module,
• wherein each block assembly is structured to weigh less than 40 tons, and
• wherein the matrix power transformer system has a power rating greater than 100 megavolt-amperes (MVA), and
• wherein at least one of the transformer modules includes the first primary winding, a second primary winding, a third primary winding, a fourth primary winding, a fifth primary winding, a sixth primary winding, the first secondary winding, a second secondary winding, a third secondary winding, a fourth secondary winding, a fifth secondary winding, and a sixth secondary winding, wherein the voltage ratio of the first primary winding to the second primary winding to the third primary winding to the fourth primary winding to the fifth primary winding to the sixth primary winding is 1:1:1:1:1:1, and wherein the voltage ratio of the first secondary winding to the second secondary winding to the third secondary winding to the fourth secondary winding to the fifth secondary winding to the sixth secondary winding is 1:1:1:1:1:1.

A modular power transformer having a power rating greater than 100 MVA comprising:

• a plurality of transformer blocks each including:
• an enclosure,
• a first set of block terminals,
• a second set of block terminals, and
• a plurality of transformer modules located within the enclosure, each module including:
• a first set of module terminals,
• a second set of module terminals,
• at least one primary winding coupled to the first set of module terminals,
• at least one secondary winding coupled to the second set of module terminals, and
• a transformer core,
• wherein the primary windings of the transformer modules in one transformer block are coupled together between the first set of block terminals and the secondary windings of the transformer modules in the same transformer block are coupled together between the second set of block terminals, and
• wherein at least one of the transformer modules includes the first primary winding, a second primary winding, a third primary winding, a fourth primary winding, the first secondary winding, and a second secondary winding, wherein the voltage ratio of the first primary winding to the second primary winding to the third primary winding to the fourth primary winding is 5:1:1:5, and wherein the voltage ratio of the first secondary winding to the second secondary winding is 1:1.

A modular power transformer having a power rating greater than 100 MVA comprising:

• a plurality of transformer blocks each including:
• an enclosure,
• a first set of block terminals,
• a second set of block terminals, and
• a plurality of transformer modules located within the enclosure, each module including:
• a first set of module terminals,
• a second set of module terminals,
• at least one primary winding coupled to the first set of module terminals,
• at least one secondary winding coupled to the second set of module terminals, and
• a transformer core,
• wherein the primary windings of the transformer modules in one transformer block are coupled together between the first set of block terminals and the secondary windings of the transformer modules in the same transformer block are coupled together between the second set of block terminals, and
• wherein at least one of the transformer modules includes the first primary winding, a second primary winding, a third primary winding, a fourth primary winding, a fifth primary winding, a sixth primary winding, the first secondary winding, a second secondary winding, a third secondary winding, a fourth secondary winding, a fifth secondary winding, and a sixth secondary winding, wherein the voltage ratio of the first primary winding to the second primary winding to the third primary winding to the fourth primary winding to the fifth primary winding to the sixth primary winding is 1:1:1:1:1:1, and wherein the voltage ratio of the first secondary winding to the second secondary winding to the third secondary winding to the fourth secondary winding to the fifth secondary winding to the sixth secondary winding is 1:1:1:1:1:1.

A method for assembling a modular power transformer comprising:

• selecting a plurality of transformer modules from a set of standardized transformer modules, each standardized transformer module including a primary winding, a secondary winding, and a core;
• assembling a plurality of transformer blocks by coupling sets of the selected plurality of transformer modules, the weight of each transformer block being equal to or less than 40 tons;
• separately transporting each transformer block to a remote location;
• and
• coupling each of the transformer blocks together at the remote location between an AC power source and a load to form the modular power transformer including a power rating greater than 100 megavolt-amperes (MVA), and
• wherein the set of standardized transformer modules includes a second standardized transformer module including the first primary winding, a second primary winding, a third primary winding, a fourth primary winding, the first secondary winding, and a second secondary winding, wherein the voltage ratio of the first primary winding to the second primary winding to the third primary winding to the fourth primary winding is 5:1:1:5, and wherein the voltage ratio of the first secondary winding to the second secondary winding is 1:1.

A method for assembling a modular power transformer comprising:

• selecting a plurality of transformer modules from a set of standardized transformer modules, each standardized transformer module including a primary winding, a secondary winding, and a core;
• assembling a plurality of transformer blocks by coupling sets of the selected plurality of transformer modules, the weight of each transformer block being equal to or less than 40 tons;
• separately transporting each transformer block to a remote location;
• and
• coupling each of the transformer blocks together at the remote location between an AC power source and a load to form the modular power transformer including a power rating greater than 100 megavolt-amperes (MVA), and
• wherein the set of standardized transformer modules includes a first standardized transformer module including the first primary winding, a second primary winding, a third primary winding, a fourth primary winding, a fifth primary winding, a sixth primary winding, the first secondary winding, a second secondary winding, a third secondary winding, a fourth secondary winding, a fifth secondary winding, and a sixth secondary winding, wherein the voltage ratio of the first primary winding to the second primary winding to the third primary winding to the fourth primary winding to the fifth primary winding to the sixth primary winding is 1:1:1:1:1:1, and wherein the voltage ratio of the first secondary winding to the second secondary winding to the third secondary winding to the fourth secondary winding to the fifth secondary winding to the sixth secondary winding is 1:1:1:1:1:1.