Power Voltage Transformers

Introduction Trench Power Voltage Transformers (Power VTs) combine the attributes of an inductive voltage transformer with the application of a distribution transformer, therefore they are the perfect solution wherever low voltage is needed and high voltage is available. Power VTs simply have to be connected to the high voltage overhead line to provide power at low voltage. Due to this direct connection to the transmission line, the reliability of Power VTs is very high, as they are not dependent on distribution lines that are more susceptible to outages. Fig. 1: Equivalent Circuit Diagram of...

Applications Auxiliary power supply for substations Power supply for cell phone relay stations Auxiliary power for substations is mostly supplied over a tertiary winding of the power transformer. With a Power VT, such a tertiary winding can be avoided, supplying the power needed directly from the transmission line within the substation, while serving as conventional Voltage Transformer at the same time. To improve coverage, cell phone network providers might need to install stations in remote areas where the necessary output power and voltage is not available. With Power VTs it is possible to...

Features and Design of Power VTs • Combination of Inductive Voltage Transformer and Power Transformer • Low cost alternative to small power transformers or distribution feeders • Available with windings for metering and protection purpose • Accuracy classes according to international standards • Output power up to 100 kVA • SF6-insulated, Composite insulator • Design and dimensions based on conventional Trench Inductive Voltage Transformers and Trench Test Transformers • Compact size and weight as compared to conventional power transformers • Excellent control of internal and external insulation...

Technical Data Voltage level Rated power frequency withstand voltage Rated lighting impulse withstand voltage Rated switching impulse withstand voltage Output power Output voltage Rated voltage factor 100 120 to 400 (values in between according to customer specification) 1.5 (30 s) Rated frequency Creepage distance 25 – 31 (higher upon request) Temperature range Insulation class Metering accuracy class Protection accuracy class Values in accordance with IEC; other values like ANSI are available 1) lower or higher temperature upon request 2) not under full load condition

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