The function of a single-phase drum-type tap changer
Release date:
2025-12-31
The core function of a single-phase drum-type tap changer is to adjust the transformer’s output voltage by switching between winding taps, thereby ensuring stable grid voltage.
The core function of a single-phase drum-type tap changer is to adjust the transformer’s output voltage by switching between winding taps, thereby ensuring stable grid voltage. Specifically:
1. Voltage Regulation Function
Addressing grid fluctuations: When grid voltage fluctuates due to load changes or external factors, the tap changer stabilizes the output voltage by adjusting the turns ratio (V1/V2 = N1/N2).
Adapting to Load Requirements: Under varying load conditions, the tap changer can adjust the voltage to meet equipment needs, thereby preventing overvoltage or undervoltage.
2. Structural Features
Drum‑shaped design: The stationary contact is cylindrical, while the moving contact is annular; a disc spring is installed internally, allowing the moving contact to offset relative to the central axis during switching, with the contact pressure determined by the magnitude of this displacement.
Application scenarios: Drum-type no-excitation tap changers are typically used for voltage regulation at the mid-point of windings, with voltage ratings ranging from 35 to 220 kV and current ratings from 300 to 1000 A.
3. Operating Method
No-excitation operation: Adjusts the tap changer and changes the voltage ratio without applying voltage to the transformer.
On-load operation: Operations are performed under transformer excitation or load conditions to achieve voltage regulation.
Through the aforementioned functions, the drum-type tap changer ensures the stable operation of transformers under various operating conditions and serves as an indispensable voltage-regulating device in power systems.
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