The - · PDF filecircuit breaker bushings Wham! ... pel fromthe interrupterfist-sized metal...
Transcript of The - · PDF filecircuit breaker bushings Wham! ... pel fromthe interrupterfist-sized metal...
TheHoneywell Visicorderoscillograph
records forces incircuit breakerbushingsWham! Forces imposed by the operation of oil-
filled circuit breakers especially during short-cir-cuit interruption-are destructive enough to damagebushings. Engineers at the Ohio Brass Company havedevised an ingenious method of simulating this ex-plosive force in order to analyze bushing loads.On a typical bushing, they mounted a dummy in-
terrupter, in which they exploded gunpowder to pro-pel from the interrupter fist-sized metal projectiles.
Strain gages, installed on the bushing groundsleeve, were connected to a Honeywell 119 Amplifier.A Honeywell 906 Visicorder oscillograph was
chosen to record the test data because ofthe extremelyhigh speed and transient nature of the signals to bemeasured.A typical record of this test, shown at right, was
made at a record speed of 50"/second.These Ohio Brass tests have opened the way to the
development of standards for the mechanical per-formance of bushings (AIEE papers 62-153, 60-107).
This application is only one of thousands wherethe Visicorder is called upon daily as a basic research,test, and development tool. One of the six differentVisicorder models should be a basic instrument inthe management of your data acquisition.
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Schematic at left diagrams method for duplicating bushing loads during short-circuitinterruptions. Projectile (A) produces lateral forces at right angles to bushing axis;projectile (B) produces axial load on bushing terminal. At right, squibs havejust detonated charges propelling projectiles from dummy interrupter. Below,Honeywell Model 906 Visicorder Oscillograph records circuit breaker bushing testfor Ohio Brass.
For full details on all Visicorder Oscillographs,tape systems, and signal conditioning equip-
{^ j ment, write to Honeywell, Denver Division,Denver 10, Colorado, or phone 303-794-4311.
DATA HANDLING SYSTEMS
HoneywellThe Honeywell Model 906 Visicorder Oscillograph-with a Honeywell Model 119 Amplifier-recordcircuit bushing tests for Ohio Brass.
8636 SEPTEMBER 1963
il<II0
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SCIENCE, VOL. 141
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SCIENCE, VOL. 141866