What is on load tap changer?
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.
What is tap changer control?
The transformer tap changer controller DTR controls automatically the transformer on load tap changer, so that the power supply voltage is practically constant, independently from the load. In order to achieve this, the DTR is able to increase and decrease the OLTC in the power trans- former.
How does a tap transformer work?
Using a tap changes the voltage ratio of a transformer so that its secondary voltage stays at nominal. On large power transformers, taps on the primary are used to offset any higher or lower input voltages. These tap connections are usually set at the factory for nominal line voltage.
What is on load and off load tap changer of a transformer?
Unlike in on-load tap changing where the arc quenching is limited by oil when the transformer is on-load, the tapping with an off-load tap changer is only carried out when the transformer is in OFF-Switch condition. The system of such transformers includes a no-load tap changer on the primary winding.
What is the difference between on load tap changer and off load tap changer?
On load tap changers are the ones where taps in the transformers change automatically as per loads variations. The off load tap changers are Non automatic and are those transformers where you can change the tap manually, if required, but with the transformer completely DE-energized.
What is on load and off load?
A lever is provided inside the boat to operate this mechanism. As the lever is operated from inside, it is safe to free the boat without going out of the lifeboat, when there is a fire on ship. On load mechanism is normally used when sea is rough and unable to lower the lifeboat by off load mechanism.
Where are on load tap changers used?
A tap changer is usually installed on a high voltage section of a two-winding transformer, due to the low current in that area. The changers are also provided on high voltage windings of an electrical transformer if there is sufficient control of voltage.
What is AVR relay?
Automatic Voltage Regulating Relay (AVR) is used to Regulate the secondary voltage of Power and Distribution Transformers via On-Load Tap Changer (OLTC). Automatic Voltage. Reulating Relays. Tap Position Indicators. Remote Temperature.