Inductors - hdbk10920224

DOE-HDBK-1092-98

fault may have this problem. Action should be taken to minimize this hazard when it is

discovered.

10.10.2 INDUCTORS

This section covers inductors as well as electromagnets and coils that are used in the following typical

applications:

1. Energy storage

2. Inductors used as impedance devices in a pulsed system with capacitors

3. Electromagnets and coils that produce magnetic fields to guide or confine charged particles

4. Inductors used in dc power supplies

5. Nuclear Magnetic Resonance (NMR), Electron Paramagnetic Resonance (EPR), and Magnetic

Susceptibility Systems.

10.10.2.1 HAZARDS

Examples of Inductor hazards include:

1. Overheating due to overloads, insufficient cooling, or failure of the cooling system could

cause damage to the inductor and possible rupture of the cooling system.

2. Electromagnets and superconductive magnets may produce large external force fields that

may affect the proper operation of the protective instrumentation and controls.

3. Magnetic fields could attract nearby magnetic material, including tools and surgical implants,

causing injury or damage by impact.

4. Whenever a magnet is suddenly de-energized, production of large eddy currents in adjacent

conductive material can cause excessive heating and hazardous voltages. This state may cause

the release or ejection of magnetic objects.

5. The worker should be cognizant of potential health hazards.

6. Interruption of current in a magnet can cause uncontrolled release of stored energy. Engineered

safety systems may be required to safely dissipate stored energy. Large amounts of stored

energy can be released in the event of a "quench" in a superconducting magnet.

10.10.2.2 DESIGN AND CONSTRUCTION

The following should be considered:

1. Provide sensing devices (temperature, coolant-flow) that are interlocked with the power

source.

2. Fabricate protective enclosures from materials not adversely affected by external

electromagnetic fields. Researchers should consider building a nonferrous barrier designed

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