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Used packing machine in Chongqing, China

  • 10A DC Current Transformer Winding

    10A DC Current Transformer Winding Resistance Tester for Transformer Coil

    • Manufacturer: Gold

    10A DC Current Transformer Winding Resistance Tester for Transformer Coil I. Introduction GDZC-10 10A DC Current Winding Resistance Tester for Transformer Coil is applied to measure the DC resistance of inductanc...

    $1,500 USD
    Chongqing, China
  • Three Phase Z Type Transformer

    Three Phase Z Type Transformer Turn Ratio Tester TTR

    • Manufacturer: Gold

    Turns Ratio Range 0.8-10000 Three Phase Z Type Transformer Turn Ratio Tester Introduction: GDB-D 3 Phase Transformer Turn Ratio Tester is specially designed for three phase transformer in power system, especially...

    Chongqing, China
  • Primary Current Injection Tester Transformer

    Primary Current Injection Tester Transformer Large Current Generator

    • Manufacturer: Gold

    Primary Current Injection Tester Transformer Large Current Generator I. Introduction: SLQ series portable Primary Current Injection is a sort of special equipment designed and manufactured for experimentation of ...

    $3,000 USD
    Chongqing, China
  • Transformer Oil Automatic Dielectric Loss

    Transformer Oil Automatic Dielectric Loss Angle Tester Volume Resistivity Test Set

    • Manufacturer: Gold

    Transformer Oil Automatic Dielectric Loss Angle Tester Volume Resistivity Test Set Product Features Light weight, small size, test safe operation, a complex dual-use, portable integrated structure. With all-digit...

    $2,800 USD
    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.