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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 ...
1977 - Production of 100000-th transformer stating from the company startup, namely three-phase transformer 1 000 MVA, 330 kV for CCPP Uglegorskaya, (Ukraine); Development and introduction of unified series of single-phase on-load tap changers for the main network transformers rated for power 63–250 MVA;
Transformers designed for below-grade installation can be designed for periodic submersion in water. [14] 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]
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 distribution of audio to public address loudspeakers, have taps to allow adjustment of impedance to each speaker.
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 ...
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]