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On-load tap changer (OLTC), also known as On-circuit tap changer (OCTC), is a tap changer in applications where a supply interruption during a tap change is unacceptable, the transformer is often fitted with a more expensive and complex on-load tap changing mechanism. On-load tap changers may be generally classified as either mechanical ...
Production of autotransformer 267 MVA, 500/220 kV equipped with on-load tap changer in 220 kV line; Production of transformer rated for 1000 MVA, 330 kV for operation as a unit with generator 800,000 kW at CPP Slavyanskaya, (Ukraine) Production of three-phase autotransformer 560 MVA, 330/110 kV for substation “Coventry”, (USA);
The rating of a VSR can be changed in steps: the maximum regulation range depends on the capability of the on-load tap changer used in combination with the regulation winding used for the shunt reactor. The maximum regulation range has increased over the years, [1] from 50%, up to 80% at some voltage levels. [2]
Taps may be manually reconnected, or a manual or automatic switch may be provided for changing taps. Automatic on-load tap changers are used in electric power transmission or distribution, on equipment such as arc furnace transformers, or for automatic voltage regulators for sensitive loads. Audio-frequency transformers, used for the ...
a load tap changer (LTC) at the substation transformer, which changes the turns ratio in response to load current and thereby adjusts the voltage supplied at the sending end of the feeder; voltage regulators , which are essentially transformers with tap changers to adjust the voltage along the feeder, so as to compensate for the voltage drop ...
Distribution transformers may include an off-load tap changer, which slightly adjusts the ratio between primary and secondary voltage to bring the customer's voltage within the desired range on long or heavily loaded lines. [citation needed]
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The demand for reactive power can be reduced if the converter transformers have on-load tap changers with a sufficient range of taps for AC voltage control. Some of the reactive power requirement can be supplied in the harmonic filter components.