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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]
The tap-changing transformers with under-load tap-changing (ULTC) feature can be used to control the voltage directly. The operation of all tap-changing transformers in the system needs to be synchronized between the transformers [15] and with the application of shunt capacitors. [16]
In the legacy grid, there are three primary tools for carrying out voltage management: Load Tap Changers (LTCs), voltage regulators, and capacitor banks. LTCs and voltage regulators refer to transformers with variable turns ratios that are placed at strategic points in a network and adjusted to raise or lower voltage as is necessary.
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Electromechanical regulators called voltage stabilizers or tap-changers, have also been used to regulate the voltage on AC power distribution lines. These regulators operate by using a servomechanism to select the appropriate tap on an autotransformer with multiple taps, or by moving the wiper on a continuously variable auto transfomer.
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