WST/WDT Series De-Energized Linear Tap Changer for Oil-Immersed Transformers
Product Introduction:
An off-circuit linear tap changer, also known as a de-energized linear tap changer, allows users to select different transformer winding taps to adjust the voltage ratio. This helps compensate for variations in the primary supply voltage and maintain the required secondary voltage within the transformer's designed operating range.
Structure:
As the Off-Load Tap Changer Manufacturer, the engineering team at Wenzhou Best Imp. Exp. Co., Ltd. has repeatedly refined the tap changer design, the underlying principles consistently adhere to the five key components typical of linear tap changers:
1. Insulating rod: Features multiple stationary contacts arranged along its length.
2. Stationary contacts: Fixed to the insulating rod via cold pressing or reverse riveting; designed to make contact with the moving contacts.
3. Lead screw and nut: Driven by the operating mechanism to actuate the sliding movement of the moving contacts.
4. Moving contacts: Engage with the stationary contacts to facilitate tap position switching.
5. Operating mechanism: Typically mounted on the tank cover; drives the lead screw through a rotary motion.
Product Advantages:
Simple structure and high reliability: Wide contact spacing ensures strong short-circuit withstand capability.
Improved manufacturing process: Utilizes reverse riveting and cold-pressing connections to enhance insulation performance and reduce processing costs.
Suitable for high-current applications: The strip-type structure allows for a larger contact area, making it ideal for high-current models.
Applications:
Pole-mounted transformers
Pad-mounted transformers
Urban distribution network transformers
Industrial substations
Step-up transformers for wind and photovoltaic power transformers
Actual application for 125A linear tap changer of power equipment installation site
FAQ
1. Can an off-circuit tap changer be operated while energized?
No. Operation of this type of equipment is strictly prohibited unless the transformer has been completely de-energized, the windings fully discharged, and the unit verified as dead and grounded. Any attempt to switch while energized will cause arcing and contact erosion, resulting in permanent contact failure. This is a strict safety mandate in the power industry.
2. What should be done if the tap changer leaks oil?
First, take the unit out of service and relieve the pressure. Focus the inspection on whether the flange gasket has aged, whether the bolt preload is uniform (calibration to 8.5 N·m using a torque wrench is recommended), and whether the sealant on the inspection window has cracked. Do not attempt to patch the leak with sealant yourself; the original manufacturer's sealing components must be replaced by certified personnel, followed by an oil-tightness test.
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