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A: Its sole function is to provide a voltage with a phase differential of 180 degrees from winding to winding with respect to the tap.
AnswerTaps are simply connections part way along a coil. In the case of power transformers (i.e. Transformers used in the transmission and primary distribution system), there are usually several tap connections along the high-voltage coil, which will allow minor variations to be made to the turns ratio of the transformer which, in turn, will enable corrections to be made to the secondary voltage in order to maintain that voltage within statutory limits as the load changes.
Tap-changing mechanisms can be 'off load' or 'on load'. Off-load tap changers physically break the supply to the windings during the changeover, so must be performed with the transformer de-energised. On-load tap changers, on the other hand, use a 'make before break' arrangement with its contacts, so that tap changing can be performed with the transformer both energised and on load, and can be performed automatically or manually, to maintain the secondary voltage within its statutory range.
In the US and Canada, but not in Europe, distribution transformers use a centre-tap 240-V secondary winding, which provides the neutral for residential supplies, with opposite ends of the winding having potentials of 120 V with respect to the centre tap.
What else can I help you with?
What is on load tap chenger?
A tap changer is used to vary the turns ration between the windings of a transformer to make minor changes to the secondary voltage. An on-load tap changer enables the turns ratio to be altered without disconnecting the transformer. An off-load tap changer requires the transformer to be temporarily diconnected. On-load tap changers are installed on the high-voltage side of the transformer, where the current is lower.
Why you are using on load tap changer in primay of transformer?
The primary windings are bigger In size and it will be more accurate to tap it than tapping the smaller size secondary windings. Answer A tap changer is installed on the high-voltage side of a transformer, regardless of whether that transformer is a step-up or a step-down type. So, it isn't necessarily installed on the primary side of the transformer. The reason for this is that the current on the high-voltage side of the transformer is lower than on the low-voltage side, and the make/break contacts can be smaller. Also there are more turn on the high-voltage side so a finer degree of adjustment can be achieved.
What main by OCTC and OLTC in the transformer?
OCTC means off circuit tap changer (off load tap changer) and OLTC means on load tap changer. in octc we can change the tap position while the transformer is in off condition only. we can not change the tap position of octc in charged condtion of the transformer. the tap position of octc can be change in deenrgise condion of transformer only means if you nwant to chang the tap position firstly you will have to deenrgise the power transformer then you can change the tap position of octc.while in oltc we can change the tap position of OLTC in charged condition of power transformer. This is the basic diffirence between OCTC and OLTC.generally the OCTC used in single phase generating transformer (G.T.Power Transformer) and OLTC used in three phase powwer transformers like standby transformer and auto transformer in power plants and switch yards. for any other question please mail me at (ashu_uit2007@yahoo.co.in )
How does a buck-boost transformer work?
A Buck Boost transformer is an auto transformer with a small primary to secondary voltage difference. It effectively adds or subtracts a few windings to the secondary to increase or decrease voltage. Here is an example: Say I have a 110 v and want 120 v; I have an auto transformer with 120 windings, tapped at 110 and 120. If I connect the 110 connection to my incoming 110v line, the voltage at the 120 tap will be 120v.
What is inherent voltage regulation of an onload tap changer for power transformer?
depending on the amount of the load of transformer as well as the power factor of it, there is a transformer specific voltage drop at its terminals, due to the internal impedances. The on-load tap changer can / will be used to compensate this voltage drop or rise.
Why tapping are provided in high voltage winding of transformer?
Tappings are provided in order to make small adjustments to the turns ratio, so that the secondary voltage can be increased or reduced, if required, in order to meet the relevant statutory voltage variation requirements.Tap changing mechanisms may be 'off-load' or 'on-load' types.With off-load tap changers, the transformer must be de-energised before the tap-changing mechanism is altered, as the mechanism breaks the connection to the windings as it is changed.With on-load tap changers, the mechanism is adjusted (usually automatically, when required) with the transformer energised and supplying load. The mechanism is installed on the high-voltage side of the transformer (regardless of whether it is a step up or step down transformer) because the high-voltage windings carry the lower current, allowing smaller contacts to be used. On-load tap changers use a 'make-before-break' arrangement, so that the windings are never disconnected when the mechanism changes its tap setting.
What is the difference between an ordinary transformer and a center-tapped transformer?
An ordinary transformer has two input/output terminals but a center tapped transformer has 2 input and 3 output terminals. One is taken from the center for a ground connection. This causes it to get 50% of the actual value. And ordinary transformer contains 2 windings. An autotransformer has one.
What is center tap transformer?
Center tap transformer is the such kind of transformer that is made to a point half way along a winding of a transformer.
Function of tap chenger in transformer?
The tap changer changes the ratio of primary to secondary windings by physically adding or subtracting windings from the primary or secondary. An on load tap changer (LTC) allows dynamic voltage control, which is important when loading of transformers, and the system in general, varies (if the primary voltage sags, the LTC can be used to increase the secondary voltage so customers don't see this sag).
What is the difference between off load tap changer and on load tap changer?
An on-load tap-changer must not break the supply to the transformer's windings while the transformer is on load. So it has a 'make-before-break' arrangement with its contacts -i.e. one contact moves to the second tap setting, before the second contact moves away from the first tap setting, while a reactor balances the load currents when the contacts are on different tap settings. An on-load tap changer is motor-driven, and can be operated automatically or manually.An off-load tap-changer does not require a make-before-break arrangement, because it is designed to be operated when the transformer is disconnected.
Why tapping is necessary in a transformer?
Taps are connections to the (usually) high-voltage winding of a transformer which enables minor changes to the turns-ratio to be made in order to make minor changes to the secondary voltage to compensate, where necessary, to a fall in terminal voltage below the regulatory allowance.There are two types of tap-changing mechanism, 'off-load' and 'on-load'.Off-load tap-changing mechanisms require the transformer to be isolated before its tap settings can be adjusted, and is normally the case with smaller distribution transformers.On-load tap-changing can be performed with the transformer supplying its load, usually automatically, in response to changes in its secondary voltage. On-load tap changing mechanisms have a 'make before break' switching arrangement, to ensure that the transformer windings are not open circuited during the operation of tap changing.
Can you turn a multi-tap ballast into a step down transformer?
A mulit tap ballast is in fact an auto transformer.
