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The other end of the primary winding is connected to the transformer's case, which is connected to the neutral wire of the wye system, and is also grounded. A wye distribution system is preferred because the transformers present unbalanced loads on the line that cause currents in the neutral wire and are then grounded.
But with a delta distribution system the unbalanced loads can cause variations in the voltages on the 3 phase wires.
Delta — On a delta distribution circuit, a 'delta' or 'phase to phase' transformer is used. A single phase delta transformer has two bushings on top which are connected to two of the three primary wires, so the voltage across the primary winding is the phase-to-phase voltage.
A disadvantage of a delta transformer is if only one of the two primary phases is deenergized, the remaining phase will backfeed through the transformer winding into the deenergized phase, which could be a hazard to line workers. Transformers providing three-phase secondary power, which are used for residential service in the European system, have three primary windings and are attached to all three primary phase wires.
The windings are almost always connected in a 'wye' configuration, with the ends of the three windings connected and grounded. The transformer is always connected to the primary distribution lines through protective fuses and disconnect switches. For pole-mounted transformers this usually takes the form of a ' fused cutout '. An electrical fault causes the fuse to melt, and the device drops open to give a visual indication of trouble.
It can also be manually opened while the line is energized by lineworkers using insulated hot sticks. In some cases completely self protected transformers are used, which have a circuit breaker built in, so a fused cutout isn't needed. Secondary[ edit ] The low voltage secondary windings are attached to three or four terminals on the transformer's side.
The V secondary winding is center-tapped and the center neutral wire is grounded, making the two end conductors "hot" with respect to the center tap.
These three wires run down the service drop to the electric meter and service panel inside the building. Connecting a load between either hot wire and the neutral gives volts.
Connecting between both hot wires gives volts.
There are three V secondary windings, each receiving power from a primary winding attached to one of the primary phases. One end of each secondary winding is connected to a 'neutral' wire, which is grounded.
The other end of the 3 secondary windings, along with the neutral, are brought down the service drop to the service panel. Higher secondary voltages, such as volts, are sometimes required for commercial and industrial uses. Some industrial customers require three-phase power at secondary voltages.
To provide this, three-phase transformers can be used. In the US, which uses mostly single phase transformers, three identical single phase transformers are often wired in a transformer bank in either a wye or delta connection, to create a three phase transformer.
Construction[ edit ] Oil-cooled three-phase distribution transformer, similar to one in above photo, with housing off, showing construction. Distribution transformers are made using a core made from laminations of sheet steel stacked and either glued together with resin or banded together with steel straps. Where large numbers of transformers are made to standard designs, a wound C-shaped core is economic to manufacture.
A steel strip is wrapped around a former, pressed into shape and then cut into two C-shaped halves, which are re-assembled on the copper windings. Other compatible transformers will be tried in priority order if the one with highest priority fails for some reason.
If multiple transformations are needed to get from source to target mimetype a pipeline transformation can be set up. It is also possible to control exactly which transformers are used in case of a failure by using the failover property.
If you are running an Enterprise edition these properties may be changed via JMX while SkyVault Content Services is running note, any changes via JMX and database takes precedence over any property file settings. You can create custom content transformers to transform one type of content into another, where that transformation is not already supported, such as when you have a custom input content type, or custom output content type.
Take the JSON mimetype for example, if you upload a JSON file to the repository it will not have a thumbnail or a preview, and it will not be indexed and searchable.
The following will show up in the logs when debugging is turned on turn it on via log4j. TransformerDebug] [http-bioexec-9] 10 json txt testnode. That would give you a lot of functionality as HTML is already fully supported with thumbnail, preview, indexing and search. One such tool is json2html , which is written in Python and can easily be invoked from the command line, and also then from a custom transformer.
To create this transformer you do not need to do any Java coding, just some Spring bean definitions and Python script coding.
Starting with the Spring beans for the custom transformer you would use the RuntimeExecutableContentTransformerWorker class as a bean implementation. It is able to execute any command line transformation that accepts an input and an output file on the command line. Basically, if you have a command line utility or a script that takes an input file, called the source, and an output file, called the target, then you can invoke it via this class.
This is a technique used for a lot of custom transformation implementations.