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Used bits in China

  • T-213S Three Phase Transformer Dc

    T-213S Three Phase Transformer Dc Resistance Test Equipment

      T-213S three phase transformer dc resistance test equipment with three channel functions can test transformer, mutual inductor, reactor, dc resistance of motor and perceptual load. resistance of motor and percept...

      Beijing, China
    • T-213 Transformer winding DC resistance

      T-213 Transformer winding DC resistance tester

        T-213 test instrument can test transformer, mutual inductor, reactor, dc resistance of motor and perceptual load. Instrument is small in size, light weight, strong function, easy operation, designed for productio...

        Beijing, China
      • TEST-903 electrical 3000A primary current

        TEST-903 electrical 3000A primary current injection test equipment

          TEST-903 3000A primary current injection test equipment adopts 32bit ARM chip to control the output process and large capacity of toroidal transformer. It can output up to 3300A, timer from 0 to 999.

          Beijing, China
        • TEST-200 200A portable primary current

          TEST-200 200A portable primary current injection test kit

            TEST-200 200A primary current injection test kit adopts 32bit ARM chip to control its output process and large capacity of toroidal transformers. It is equipped with current meter; It can show primary current val...

            Beijing, China
          • TEST-901 large current 1000a primary

            TEST-901 large current 1000a primary current injection test set

              TEST-901 primary current injection test set adopts 32bit ARM chip to control its output process and large capacity of toroidal transformers. It is equipped with LCD display and current meter; it can show primary ...

              Beijing, 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.