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Related Concept Videos

Instrument Transformers01:23

Instrument Transformers

Instrument transformers, comprising voltage transformers (VTs) and current transformers (CTs), play crucial roles in power substations by providing isolated replicas of current or voltage for measurement and protection purposes. Voltage transformers reduce the primary voltage to levels suitable for relay operation and measurement, while current transformers scale down the primary current. The primary winding of a current transformer often consists of a single turn, achieved by threading the...
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Moving coil linear variable differential transformer.

J F Ellis1, P L Walstrom

  • 1Oak Ridge National Laboratory, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA.

The Review of Scientific Instruments
|March 1, 1978
PubMed
Summary
This summary is machine-generated.

A novel moving-coil linear variable differential transformer (LVDT) without ferromagnetic parts is introduced. This magnetic field-immune transducer offers a robust alternative to conventional LVDTs for precise measurements.

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Area of Science:

  • Physics
  • Electrical Engineering
  • Materials Science

Background:

  • Conventional linear variable differential transformers (LVDTs) utilize ferromagnetic cores, making them susceptible to external magnetic fields.
  • High magnetic field environments pose a challenge for accurate displacement sensing.

Purpose of the Study:

  • To describe a novel moving-coil LVDT design that eliminates ferromagnetic components.
  • To demonstrate the device's immunity to strong ambient magnetic fields.

Main Methods:

  • Development of a moving-coil LVDT incorporating no ferromagnetic materials.
  • Testing the transducer's performance in ambient magnetic fields up to 8 Tesla.
  • Integration with a standard carrier amplifier for signal conditioning.

Main Results:

  • The developed LVDT is virtually unaffected by ambient magnetic fields up to 8 T.
  • The device is interchangeable with conventional moving-core LVDTs.
  • Successful signal conditioning using a commercially available carrier amplifier.

Conclusions:

  • The ferromagnetic-free moving-coil LVDT provides a reliable solution for displacement sensing in high magnetic field environments.
  • This innovation enhances the robustness and applicability of LVDT technology.