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Used set in Beijing, China

  • Three-phase two-winding OLTC power transformer

    Three-phase two-winding OLTC power transformer of class 66KV

      1000 sets/sets per year International standard package, suitable for any special requirements of customer's air or sea, one set one case. 220kv,110kv and 66kv series low loss transformer if our new generation tra...

      Beijing, China
    • 66KV Class Three Phase Two

      66KV Class Three Phase Two Winding OLTC Power Transformer

        1000 Set/Sets per Year Standard international package, proper for any special customer air or sea requirements, one set one case 220kv,110kv and 66kv low loss series transformer if our independently developed new...

        Beijing, China
      • 66KV three-phase two-winding power transformer

        66KV three-phase two-winding power transformer NLTC

          20 Set/Sets per month Low loss three phase power transformer nltc oil immersed 66kv 5mva Wooden case or according to customer's request Three phase low loss power transformer nltc oil immersed 66kv 5mva 220kv,110...

          Beijing, China
        • 66KV Class Three Phase Two

          66KV Class Three Phase Two Winding NLTC Power Transformer

            20 Set/Sets per Month Three phase low-loss nltc oil immersed 66kv 5mva power transformer Wood case or according to client's requests Three-phase low-loss nltc oil-immersed 66kv 5mva power transformer 220kv,110kv ...

            Beijing, China

          Overview

          Power transformers transfer electrical energy between voltage levels for utilities, substations, and large industrial plants. These heavy, high-capacity units come in oil-filled or dry-type designs, with cooling classes (ONAN, ONAF, etc.), on-load tap changers, bushings and protection gear. Buyers must match voltage class, impedance, capacity (kVA/MVA), and cooling to system needs, and plan for foundation, handling, transport and commissioning.

          FAQ

          What specifications should I check when buying a used power transformer?

          Confirm voltage ratios, kVA/MVA rating, impedance, cooling type, phase configuration, on-load tap changer condition, bushing types and insulation class, and recent test reports (DGA, insulation resistance, turns ratio).

          How do I verify a used transformer's condition before purchase?

          Request factory and maintenance records, Dissolved Gas Analysis (DGA), insulation resistance, power factor tests, sweep-frequency response (SFRA) and a visual inspection report for leaks, rust and bushing integrity.

          What are the key shipping considerations for heavy power transformers?

          Plan for specialized heavy-haul transport, load lifting equipment, route permits, weight/axle limits, skidding or cradling, draining oil if required by regulations, and coordination with local authorities for oversized loads.

          What site preparations are needed before delivery and installation?

          Prepare a level, rated foundation or skid with proper anchoring, ensure crane access and pad capacity, verify cable entry, grounding, oil containment for liquid-filled units, and arrange for qualified rigging and electrical commissioning crews.

          What ongoing maintenance keeps a power transformer reliable?

          Perform regular DGA, insulation resistance and oil quality tests, thermographic inspections, tap changer maintenance, bushing checks, cooling system inspections and timely repairs. Follow manufacturer intervals and keep detailed service records.