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In general, the thermal-vacuum weight loss of silicone materials is exceptionally low, regardless of preconditioning. The fact that most silicones do not contain the plasticizers, antioxidants, extenders and other additives commonly used in many organic materials significantly contributes to their superior performance in simulated space environment. In cases such as volatile components condensing...
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The insulation reliability of a winding has a direct relationship to the reliability of its individual coils. As previously described, this depends upon tests made on components and on assembled coils in various phases of manufacture. Past experience is the major contributor in specifying limits for these tests. Machines in service have proven reliability, by long, continuous periods of trouble-free...
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Space is both an environment and an insulating medium. Space, viewed as an environment, is characterized by great temperature extremes, bursts of dangerous particulate and electromagnetic radiation, extremely low gas pressures, and swarms of particles and clouds of dust. Space as an insulating medium is characterized by a heat transfer process that is limited solely to radiation, the high dielectric...
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The Generator Rotor Simulated Service Test represents a new and useful method of comparing different slot armor insulation systems in a functional manner. The capability to combine mechanical, electrical and thermal stresses on Iow cost samples of new and aged slot armor constructions has speeded the development and application of new materials. A new type of molded fibrous glass and resin slot armor...
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1. Rigid polyurethane foams are feasible for encapsulation of intermediate voltage low-energy networks. From the knowledge of the dielectric system, design packaging voltages in 3 to S kv RMS range appear to be practical. This type of packaging would require careful attention to exposed electrode design so as to reduce dielectric stress levels to acceptable values adjacent to terminals. 2. Foam materials...
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From this series of test bars. the following conclusions regarding phase lead insulation have been drawn: 1. A silicone rubber insulation system comprised of the molded tape and paste combination exhibits good insulation properties even when subjected to as much as twice normal operating temperatures. 2. A silicone rubber insulation system comprised of self fusing tape deteriorates under heat and...
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Reliance on motor insulation to provide integral protection against environmental hazards has advanced to where this attribute has become a major, and sometimes determining, motor requirement. Only within the last two decades has insulation technology come of age. No longer a weak link to be protected by bulky enclosures, insulation systems of large motors today can withstand on their own varying...
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Efficiency is defined as the ratio of output to input energy. Design engineers strive for maximum efficiency or an efficiency as close to unity as is practical. Maximum efficiency with respect to magnet wire insulation requires that the ratio of output to input energy approach zero. For maximum efficiency, magnet wire insulations have to exhibit minimum Ioss while maintaining physical strength under...
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This paper has presented a new product concept including the latest performance test results and user experience. The primary function of the product is to provide terminations or apparatus connections for shielded power cable which are: 1. Completely submersible 2. Fully shielded 3. Disconnectable 4. Factory tested 5. Simply applied
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The following conclusions were derived from the activity found necessary in order to produce a functional, reliable encapsulated motor.
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1. Temperature Measurement The thermocouple method of temperature determination has given reliable results but is subject to the following restrictions: a. Enough couples must be used to obtain representative results and provide back-up protection in the event that one couple fails before the motor reaches end of life. b. Sufficient insulation must be provided at the thermocouple tip to prevent cut...
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The foregoing presents evidence of corrosion caused by the heat decomposition of electrical insulation materials. The temperatures used with Class O and A type materials were necessarily somewhat severe in order to include the additional heat caused by the operation of electrical or electronic systems within closed containers. The results show: 1. That extracted materials from PVC sleevings and also...
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Some present developments in the area of laminated, low-loss and combined substrates for use in electronic equipment are discussed. The tailoring of these materials, particularly in light of their intended fabrication, to meet specific engineering needs is reviewed in terms of several concrete applications. Some of the properties which appear critical for the successful use of these materials are...
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These results are part of a continuing program to develop more reliable wire and cable for military applications. Significant progress has already been made in developing realistic evaluation tests which reduce screening time and improve reliability.
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1. This “shortie” termination based on the track resistance of pressure-sensitive silicone tape and the hiding-of-the-ground is expected to find wide use in areas where space Iimitations prohibit the use of the 30″ taped termination. Examples of such Iocations are pad mounted transformers, switch gear, motor leads and portable high voltage cable couplers. 2. This design is versatile. It can be used...
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Film insulated magnet wires and all plastics, deform, flow away, or even evaporate as a function of heat and pressure. MIL-W-583, its predecessors, several NEMA specifications, and most sales literature describe a cut-through test performed in a well-known manner. Various and numerous burnout tests are also being studied. The tool motor industry has developed burnout tests with actual tools. Unfortunately,...
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These results show that pyrolysis of a surprisingly small amount of a resin can create an explosive environment in a confined system. While the polyimide resin has the greatest thermal stability of the three resins tested, less of this resin must be pyrolyzed in order to create an explosive environment.
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