Tap Changer At Transformer

Tap changer is a tool of change to get a voltage transformation ratio of secondary operations better (desirable) from the line voltage / primary changes.

To meet the voltage quality of service according to customer needs (PLN), the output voltage (secondary) transformer must be changed as desired. To meet this, then on one or on both sides of the transformer winding is made tap (tapping) to change the transformation ratio (ratio) transformer.

There are two ways to work the tap changer:

1. Changing the tap in the transformer no-load conditions. The tap changer which can only operate to move the transformer tap transformer in a state of no load, called "Off Load Tap Changer" and can only be operated manually (Figure 1).

2. Transformer tap change in circumstances under load. Tap changer that can operate to move the tap transformer, the transformer is under load condition, called "On Load Tap Changer (OLTC)" and can be operated manually or automatically (Figure 2)

The transformer is installed in substations in general use tap changer which can be operated in an overloaded transformer and mounted on the primary side. While penaik voltage transformer in a power transformer capacity or in small, generally using the tap changer is operated only when the transformer no-load power.

OLTC consists of:

1. Selector Switch

2. diverter switch

3. transition resistor

To isolate the transformer from the body (ground) and to reduce heat during the process of moving the tap, then the OLTC immersed in insulating oil which is usually separated from the main transformer insulating oil (there are several transformers that compartemennya become one with the main tank).

Because the process of displacement relations in the oil tap electrical phenomenon, mechanical, chemical and heat, the OLTC insulation oil quality will quickly decline. depending on the amount of work and abnormalities in the OLTC.

Hopefully helpful,

link : http://dunia-listrik.blogspot.com/2010/04/tap-changer-perubah-tap-pada.html

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