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Title: Transformer current sensor for superconducting magnetic coils

Abstract

A transformer current sensor having primary turns carrying a primary current for a superconducting coil and secondary turns only partially arranged within the primary turns. The secondary turns include an active winding disposed within the primary turns and a dummy winding which is not disposed in the primary turns and so does not experience a magnetic field due to a flow of current in the primary turns. The active and dummy windings are wound in opposite directions or connected in series-bucking relationship, and are exposed to the same ambient magnetic field. Voltages which might otherwise develop in the active and dummy windings due to ambient magnetic fields thus cancel out. The resultant voltage is purely indicative of the rate of change of current flowing in the primary turns.

Inventors:
 [1];  [2]
  1. Oak Ridge, TN
  2. Norris, TN
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
866509
Patent Number(s):
US 4727316
Assignee:
United States of America as represented by United States (Washington, DC)
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
transformer; current; sensor; superconducting; magnetic; coils; primary; carrying; coil; secondary; partially; arranged; active; winding; disposed; dummy; experience; field; due; flow; windings; wound; opposite; directions; connected; series-bucking; relationship; exposed; ambient; voltages; otherwise; fields; cancel; resultant; voltage; purely; indicative; rate; change; flowing; ambient magnetic; magnetic coil; opposite direction; superconducting magnet; superconducting coil; opposite directions; magnetic field; magnetic fields; current flow; current flowing; superconducting magnetic; current sensor; field due; winding disposed; transformer current; /324/336/

Citation Formats

Shen, Stewart S, and Wilson, C Thomas. Transformer current sensor for superconducting magnetic coils. United States: N. p., 1988. Web.
Shen, Stewart S, & Wilson, C Thomas. Transformer current sensor for superconducting magnetic coils. United States.
Shen, Stewart S, and Wilson, C Thomas. Fri . "Transformer current sensor for superconducting magnetic coils". United States. https://www.osti.gov/servlets/purl/866509.
@article{osti_866509,
title = {Transformer current sensor for superconducting magnetic coils},
author = {Shen, Stewart S and Wilson, C Thomas},
abstractNote = {A transformer current sensor having primary turns carrying a primary current for a superconducting coil and secondary turns only partially arranged within the primary turns. The secondary turns include an active winding disposed within the primary turns and a dummy winding which is not disposed in the primary turns and so does not experience a magnetic field due to a flow of current in the primary turns. The active and dummy windings are wound in opposite directions or connected in series-bucking relationship, and are exposed to the same ambient magnetic field. Voltages which might otherwise develop in the active and dummy windings due to ambient magnetic fields thus cancel out. The resultant voltage is purely indicative of the rate of change of current flowing in the primary turns.},
doi = {},
url = {https://www.osti.gov/biblio/866509}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

Patent:

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