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Used polarization controllers in Chongqing, China

  • Gdva-405 Popular Multifunctional Instrument Transformer

    Gdva-405 Popular Multifunctional Instrument Transformer CT PT Tester

    • Manufacturer: CHONGQING GOLD

    GDVA-405 Popular Multifunctional Instrument Transformer CT PT Tester Product Description GDVA-405 CT PT Tester is a comprehensive CT and PT analyzer. It's constant voltage and current is highly stable. DSP system...

    Chongqing, China
  • Automatic TTR Three Phase Transformer

    Automatic TTR Three Phase Transformer Turn Ratio Tester

    • Manufacturer: Gold

    GDBC-901 Automatic TTR Three Phase Transformer Turn Ratio Tester I ntroduction: GDBC-901 Automatic TTR Transformer Turn Ratio Tester is designed according IEC76-1 and IEC60044. GDBC-901 Automatic TTR Transformer ...

    Chongqing, 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.