44954808 on Load Tap Changer
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Transcript of 44954808 on Load Tap Changer
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Load Tap Changersfor Power Transformers
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• Off-load tap-changer The transformers are normally equipped with a
5-position off-load tap-changer on the High Voltage side, with its handle located on the cover. When changing the tap position the transformer has to be un-energized. Position 1 of the tap-changer (+ position) corresponds with the highest ratio, which gives the lowest voltage on the Low Voltage side. Position 5 of the tap-changer (- position) corresponds with the lowest ratio which consequently gives the highest voltage on the Low Voltage side. Transformers having dual primary (or secondary) voltages are usually equipped with a selector switch with the handle on the cover.
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Off Load Tap Changers
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• On-load tap-changer The on-load tap-changer is mounted on the cover of
the main transformer tank. The tap-changer works as a selector switch combining the features of a diverter switch and a tap selector. The selector switch is located in a separate oil compartment which is connected to its own conservator. The selector switch is of the high-speed, spring operated type with resistive transition impedances. The tap-changer is equipped with a protective relay. The selector switch can be lifted for inspection and the oil in the compartment can be changed separately. The on-load tap-changer is provided with a motor drive mechanism for remote and local control. Normally the motor drive is three-phase and the control and the heating circuits are for single phase AC supply. When requested, DC circuits can be supplied.
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Basic Principle of LTCs
• LTCs allow to change the ratio of a transformer by adding turns to or
subtracting turns from either the primary or the secondary winding
• For this purpose, the transformer is equipped with a “regulating or tap
winding”, which is connected to the LTC terminals
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Winding arrangement of LTCs
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Commonly Used Winding ConnectionsLTC Application at the Neutral End of Y-Connected
Transformer Windings
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Commonly Used Winding ConnectionsLTC Application in Delta-Connected Transformer
Windings
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Basic Arrangements of Regulating (Tap) Windings
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General LTC Arrangements
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Basic Switching Principle of LTCsTransfer of Load Current
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Design Principles of Oil Type LTCs
Resistor Oil Type LTCs
Reactor Oil Type LTCs
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on-load tap-changers with singlecompartment on-tank type.
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On-load tap-changer designed for mounting inside of thetransformer tank,
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Tap-changers designed for mountinginside the transformer tank suspended from the transformer
cover.
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Any Questions
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