Distribution Transformers
General Information
- Description
On the last transformation step from the power station to the consumer, distribution transformers (DT) provide the necessary power for systems and buildings.
Accordingly, ther operations must be reliable, efficient and, at the same time, silent. Distribution transformers are used to convert electrical energy of higher voltage, usally up to 36 KV, to a lower voltage, usally 250 or 435 V, with an identical frequency before and after the transformation. Application of the product is mainly within suburban areas, public supply authorities and industrial customers. Distribution transformers are usally the last item in the chain of electrical energy supply to households and industrial enterprises.
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Voltage Regulators
- Description
- Details
Siemens invented the voltage regulator in 1932 and pioneered its use in the United States. Voltage regulators are tapped step autotransformers used to ensure that a desired level of voltage is maintained at all times. Voltage regulators are oil-immersed and can be 1-phase or 3-phase. Available at 50 or 60 Hz and with 55 or 65 °C temperature rise, they can be used in any electrical system to improve voltage quality.
Voltage regulator ratings are based on the percent of regulation (i.e., 10 %). For example, a set of three 1-phase 333 kVA regulators would be used with a 10 MVA transformer (e.g., 10 MVA • 0.10/3 = 333 kVA). 1-phase voltage regulators are available in ratings ranging from 2.5 kV to 19.9 kV and from 38.1 kVA to 889 kVA. 3-phase voltage regulators are available at 13.2 kV or 34.5 kV and from 500 kVA to 4,000 kVA.
Voltage regulators can be partially or completely untanked for inspection and maintenance without disconnecting any internal electrical or mechanical connections. After the unit is untanked, it is possible to operate the voltage regulator mechanism and test the control panel from an external voltage source without any reconnections between the control and the regulator.
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