Oil Immersed Distribution Transformer with No-Load Tap Changer

Oil Immersed Distribution Transformer with No-Load Tap Changer is reliable product from Ceho factory. The core utilizes high-permeability grain-oriented cold-rolled silicon steel sheets. It has a core-type design with fully skewed joints and a segmented structure. The core columns exhibit multi-level stepped circular cross-sections, while the yoke and core maintain uniform cross-sections.

The core of this product utilizes high-permeability grain-oriented cold-rolled silicon steel sheets. It features a core-type design with fully skewed joints and a segmented structure. The core columns exhibit multi-level stepped circular cross-sections, while the yoke and core maintain uniform cross-sections.

Windings employ corrugated oil channels with non-varnish impregnation and compression band binding. All windings are concentric coils. The high-voltage winding features taps corresponding to tap voltage requirements, connected to the tap changer mounted on the tank cover. This allows voltage transfer between 10kV and 20kV and tap voltage adjustment after power disconnection.

Safety Protection Devices 30~2000kVA transformers are equipped with pressure relief valves. Gas relays with alarm and trip terminals can be installed per user requirements. Oil Temperature Measurement Devices All transformers feature glass thermometer sockets mounted on the tank top, extending 120±10mm into the oil. 1000~2000kVA transformers feature outdoor signal thermometers. Oil-immersed distribution transformer with no-load tap changer tanks are constructed with corrugated walls, finished with a durable powder-coated paint film. The corrugated fins not only provide cooling but also function as “breathing” elements, their elasticity compensating for oil volume changes due to temperature fluctuations. Therefore, fully sealed transformers eliminate the need for an oil conservator, reducing overall height. Vacuum oil filling during encapsulation completely removes moisture from the transformer, preventing transformer oil from contacting air. This effectively blocks oxygen and water ingress that could degrade insulation performance and accelerate oil aging, thus eliminating the need for periodic oil sampling tests.

Technical parameters

Pre-Operation Distribution Transformer Inspection

1. Verify transformer certification; if certification exceeds two months, retest insulation resistance.

2. Inspect oil level and breather vent of Oil Immersed Distribution Transformer with No-Load Tap Changer; no oil leakage, oil condition normal with adequate ventilation.

3. Check integrity of high/low voltage insulating bushings and associated leads; ensure bolts are secure.

4. Confirm voltage regulator switch position is correct; verify high/low voltage fuses are properly matched.

5. Ensure lightning protection devices are fully operational; measured grounding resistance must meet standards.

6. No abnormalities observed in cables or busbars.

Customer Photos

Maintenance Notes

● Manual operation requires pre-scheduled shutdowns for tap changer replacement.

● Regularly inspect the mechanical wear of the tap changer on Oil Immersed Distribution Transformer with No-Load Tap Changer.

● Monitor oil quality to ensure insulation and cooling performance.