Transformer current sensor for superconducting magnetic coils

Patent · Fri Jan 01 00:00:00 EST 1988

OSTI ID:866509

Shen, Stewart S ^[1]; Wilson, C Thomas ^[2]

---

1. Oak Ridge, TN
2. Norris, TN

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.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: W-7405-ENG-26
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4727316
• OSTI ID: 866509
• Country of Publication: United States
• Language: English

Related Subjects

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/