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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 ...
In one place the article says, "No-load tap changer (NLTC), also known as Off-circuit tap changer (OCTC)" and in another it says, "On-load tap changer (OLTC), also known as On-circuit tap changer (OCTC)" Is OCTC an off-circuit tap changer or is it an on-circuit tap changer? PacoverdeBSR 02:12, 2 May 2021 (UTC) sir OCTC ko automatic tap changer ...
An increase in this variable means the higher pole is further above the corner frequency. The y-axis is the ratio of the OCTC (open-circuit time constant) estimate to the true time constant. For the lowest pole use curve T_1; this curve refers to the corner frequency; and for the higher pole use curve T_2. The worst agreement is for τ 1 = τ 2.
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.
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 converter is a variation on the cycloconverter, invented in 1981 by New York City electrical engineer Melvin Sandler and significantly functionally enhanced in 1982 through 1984 by graduate students Mariusz Wrzesniewski, Bruce David Wilner, and Eddie Fung.
The most straightforward phase angle compensation device would be to replace the tap changer on PAR with thyristors to switch portions of the winding in and out, forming a Thyristor-Controlled Phase-Shifting Transformer (TCPST). [17] However, this is generally not done as a TCPST would be considerably more expensive than a PAR.
The tap changer was connected to the main transformer primary at 40 different transformer windings. By increasing the windings of the primary, the output voltage on the transformer secondary increased and hence the traction motor power. When the driver moved the controller to the up position, the tap changer running points increased ...