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Used circle in China

  • Three-Phase Transformer Turns Ratio Tester

    Three-Phase Transformer Turns Ratio Tester Vector Group TTR Test

    • Manufacturer: RUN TEST

    Three-Phase Transformer Turns Ratio Tester Vector Group TTR Test 3 phase transformer turn ratio tester is used to conduct turns ratio or voltage ratio test in Current or Voltage transformer. During the processing...

    $1,700 USD
    Baoding, China
  • Efficient Automatic Three Phase Transformer

    Efficient Automatic Three Phase Transformer Turns Ratio TTR Meter Substation Transformer TTR Tester

    • Manufacturer: RUN TEST

    Efficient Automatic Three Phase Transformer Turns Ratio TTR Meter Substation Transformer TTR Tester 3 phase transformer turn ratio tester is used to conduct turns ratio or voltage ratio test in Current or Voltage...

    $1,600 USD
    Baoding, China
  • Big Store Ring Toroid Transformer

    Big Store Ring Toroid Transformer Winding Machine

      Rack Numerical controlled toroidal winding machine Main characteristics 1.single-chip microcomputer design, more powerful, smaller, stronger anti-interference ability. 2.Winding shafts provide 1~9 accelerated slo...

      Zhongshan, China
    • FLOOR TYPE Big Store Ring

      FLOOR TYPE Big Store Ring Toroid Transformer Winding Machine

        Rack Numerical controlled toroidal winding machine Main characteristics 1.single-chip microcomputer design, more powerful, smaller, stronger anti-interference ability. 2.Winding shafts provide 1~9 accelerated slo...

        Zhongshan, China
      • Belt Type Toroid Winding Machine

        Belt Type Toroid Winding Machine For Inductors, Ring Winding Machine

          belt type toroid winding machine for inductors, ring winding machine Main characteristics 1.single-chip microcomputer design, more powerful, smaller, stronger anti-interference ability. 2.Winding shafts provide 1...

          Zhongshan, China
        • no-image_en.png

          Middle Store Ring Toroid Transformer Tape Machine

            Rack Numerical controlled toroidal winding machine Main characteristics 1.single-chip microcomputer design, more powerful, smaller, stronger anti-interference ability. 2.Winding shafts provide 1~9 accelerated slo...

            Zhongshan, China

          Overview

          Current transformers (CTs) convert high alternating currents into a scaled secondary current for meters, relays and protection systems. Available as window, wound or bar types, CTs vary by ratio, accuracy class and saturation behavior. Proper selection focuses on rated primary current, burden, insulation, knee-point for protection use, and condition when buying used for substations, switchgear, or industrial panels.

          FAQ

          What should I check when buying a used CT?

          Verify the nameplate ratio and accuracy class, inspect for physical damage or oil leaks, request recent ratio and insulation test reports, and confirm the CT type (wound/window/bar) and its knee-point if used for protection.

          How should a CT be prepared and shipped safely?

          Drain and seal oil-filled CTs if required, protect bushings and cores, short and ground the secondary terminals, secure the unit to prevent shock, and use a carrier experienced with electrical equipment plus insurance.

          What routine maintenance and tests are essential for CTs?

          Perform visual inspections, insulation resistance tests, ratio and polarity checks, check for oil contamination on liquid-filled units, and schedule periodic accuracy and dielectric tests per manufacturer guidelines.