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Used Current Transformer (Ct) in Brandenburg, Germany

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    Pauwels PTO

    • Manufacturer: Pauwels

    Three-phase oil transformer in Dehnerbauweise Rated power 1000 kVA, rated ratio 10 - 6 / 0.4 kV condition: revised description: conversion to hermetic design and equipped with external cone plug-throughs possible...

    Blankenfelde-Mahlow, Germany
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    BBC GBA11-800

    • Manufacturer: BBC

    Three-phase oil transformer in hermetic construction Rated input 800 kVA, rated transformation 20 / 0.4 kV condition: refurbished description: The transformer can be converted to hermetic version with OS external...

    Blankenfelde-Mahlow, Germany
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    BBC GBE S1-630

    • Manufacturer: BBC

    Three-phase oil transformer in hermetic design rated power 630 kVA, rated ratio 10 / 0.4 kV condition: overhauled description: Currently rented out!

    Blankenfelde-Mahlow, Germany
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    France Transfo TH

    • Manufacturer: France Transfo

    Three-phase oil transformer in hermetic design rated power 1000 kVA, rated ratio 6 / 0.4 kV condition: overhauled description: Currently rented out!

    Blankenfelde-Mahlow, Germany
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    Volta

    • Manufacturer: Volta

    Three-phase oil transformer in hermetic enclosure Nominal power 630 kVA, nominal ratio 20 / 0.4 kV condition: revised description: Location: CLP Currently rented!

    Blankenfelde-Mahlow, Germany
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    HTT ODNN 630/12

    • Manufacturer: HTT

    Three-phase oil transformer in Dehnerbau design Nominal power 630 kVA, nominal ratio 10 - 6 / 0.4 kV condition: refurbished description: Location: CLP Currently rented!

    Blankenfelde-Mahlow, Germany
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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.