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Used compar in China

  • Huazheng Electric High Accuracy 10kVA

    Huazheng Electric High Accuracy 10kVA 150kv Withstand Voltage Tester high voltage SF6 testing transformer

    • Manufacturer: Huazheng

    High Accuracy 10kVA 150kv Withstand Voltage Tester high voltage SF6 testing transformer 50kv to 200kv AC/DC Hipot Tester classification: There are four kinds of high voltage testing transformer according to the m...

    Baoding, China
  • Transformer Winding Low Voltage Short-Circuit

    Transformer Winding Low Voltage Short-Circuit Impedance Tester Transformer Impedance Tester

    • Manufacturer: RUN TEST

    Transformer Supplied Low Voltage Transformer Winding Short-Circuit Impedance Tester Transformer LV Short-circuit Impedance Tester applies to LV load impedance test during delivery, overhaul, trial test and handov...

    $1,700 USD
    Baoding, China
  • S13 oil-filled transformer

    S13 oil-filled transformer

      S13 oil-filled transformer has the following advantages: Low loss: The oil-immersed transformer with three-dimensional winding core has no core seams, which reduces the magnetic resistance. The direction of magne...

      Shanghai, China
    • S11 oil-filled transformer

      S11 oil-filled transformer

        S11-M series oil-filled transformer has the advantages of low loss, low noise and high efficiency. It can saves energy and reduce the pollution. Compared with ordinary oil-immersed transformers, the fully sealed ...

        Shanghai, 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.