MIL-H-8OO45B
INSTITUTE OF ELECTRICAL AND ELECTRONIC ENGINEERS ( IEEE)
Standard No. 54
Standard Test Code, and Recommended
Practice for Induction and Dielectric
Heating Equipment
(Copies of IEEE Standards may be obtained from the Institute of Electrical
and Electronic Engineers, 345 East 47th St., New York, NY 10017.)
3.
REQUIREMENTS
* 3.1 First article. When specified (see 6.2.1), the contractor shall
furnish one complete heater for first article inspection and approval
.
-,
(see 4.2 and 6.4).
The radio frequency induction heaters shall be designed
* 3.2 Design.
for conversion of electrical energy at commercial power line frequencies
to radio frequency energy. Unless otherwise specified, the nominal out-
put frequency for heaters up to 75 KW shall be within the range of 400
through 450 KHZ, and for heaters rated at 100 KW and above, the nominal
frequency shall be 300 KHZ. When specified, the output frequency shall
be as specified (see 6.2.1). Frequency conversion shall be accomplished
through the use of vacuum tube oscillator circuits. The units shall be
designed and constructed to meet the requirements specified herein using
load arrangements similar to those described in Standard IEEE No. 54, with
a load circuit efficiency of not less than 75 percent and an overall
efficiency of 45 to 50 percent. The heaters shall be specifically designed
for industrial induction heating applications. Within rated power capacity,
the units shall be capable of performing continuous production service with-
out exceeding the rated working capacity of any components contained
therein. Except as otherwise specified herein, the heaters shall be manu-
factured to comply with IEEE Standard No. 54 as it applies to radio
frequency vacuum tube type induction heaters. The heaters furnished
under this specification shall be new and of the manufacturers current
design. All parts subject to wear shall be easily accessible for adjust-
ment, replacement, and repair.
3.2.1 Safety devices.
3.2.1.1 Operator protection. The design of the heaters shall incorporate
all necessary safety devices for the protection of operating and maintenance
personnel. Electrical interlock safety switches shall be provided for all
cabinet access doors and panels, except for bolted panels, the opening of
which would expose personnel to voltages in excess of 120 volts. The design
of the work or load coil circuitry shall be such that operating personnel
will not be exposed to dangerous electrical shock. One side of the work
coil or the transformer secondary shall be grounded and suitable terminals
shall be provided for electrically grounding the entire cabinet and chassis
assembly. Warning labels shall be attached to the unit at appropriate and
3
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