Tap forms lt series#

In a resistance type tap changer, the changeover must be made rapidly to avoid overheating of the diverter. This technique overcomes the problems with open or short circuit taps.

Tap forms lt series#

The result operates like a dual-clutch transmission, with the tap selector switches taking the place of the gearbox and the diverter switch taking the place of the clutch.Ī mechanical tap changer physically makes the new connection before releasing the old using multiple tap selector switches but avoids creating high circulating currents by using a diverter switch to temporarily place a large diverter impedance in series with the short-circuited turns. Tap changers typically use numerous tap selector switches which may not be switched under load, broken into even and odd banks, and switch between the banks with a heavy-duty diverter switch which can switch between them under load. These systems usually possess 33 taps (one at centre 'Rated' tap and sixteen to increase and decrease the turn ratio) and allow for ☑0% variation (each step providing 0.625% variation) from the nominal transformer rating which, in turn, allows for stepped voltage regulation of the output.Ī mechanical On load tap changer (OLTC), also known as under-load tap changer (ULTC) design, changing back and forth between tap positions 2 and 3 On load tap changers may be generally classified as either mechanical, electronically assisted, or fully electronic.

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. In such systems, the tap changer will often be set just once, at the time of installation, although it may be changed later to accommodate a long-term change in the system voltage profile. No load tap changers are also employed in high voltage distribution-type transformers in which the system includes a no load tap changer on the primary winding to accommodate transmission system variations within a narrow band around the nominal rating.

Alternatively, in some systems, the process of tap changing may be assisted by means of a rotary or slider switch. This type of transformer is frequently employed in low power, low voltage transformers in which the tap point often may take the form of a transformer connection terminal, requiring the input line to be disconnected by hand and connected to the new terminal. No-load tap changer ( NLTC), also known as Off-circuit tap changer ( OCTC) or De-energized tap changer ( DETC), is a tap changer utilized in situations in which a transformer's turn ratio does not require frequent changing and it is permissible to de-energize the transformer system.