Has anyone seen a copy of the Underwriter's Laboratory (UL) standard 347A Medium Voltage Power Conversion Equipment, and if so can you comment on its' usefulness? Most of the medium voltage drive manufacturers list conformance to this standard in their drive specifications, but I have not had...
Hello all, I am starting to investigate the measurement/calculation of full load efficiency for a ~1000hp medium voltage motor drive. I would like to get the efficiency as accurate as possible (hopefully to a tenth of a percent - with some uncertainty of course). My plan is to calculate the...
I have a theoretical question that myself and some colleagues are debating which I'm hoping someone can shed some insight on.
Given a ship driven by a propellor via an electric motor and motor drive is operated at rated current and voltage which produces rated ship speed. What is the affect of...
Hi all, I have an older 200 HP Reliance RPM DC motor (stab. shunt) with a dual voltage field (300/150 Volt). The armature is 500 volt & 320 amp. The speed is 1150/1750 RPM (constant torque to 1150 w/ blower and constant power from 1150 to 1750). I've measured the resistance of both field...
We have been using diode bridges (six diodes in a single package) that have been failing occasionally. Line side fuses blow just as current (load) is applied to the bridge. The load is very small (significantly under the rating of fuse and diode bridge) as it is only a pre-charge of a capacitor...
Anyone know of a source for a used torque transducer. My application is a motor test stand that is 200HP at 1200RPM (~875 LB-FT) [maximum]. I can't affort new but would like to install one on the test stand if possible.
Hello all, I am considering putting together a motor test stand that would include a motor under test (typically 3 phase, permanent magnet synchronous, 440 vac, 1200 rpm, 150 HP) directly coupled to a load motor. The load motor would then be wired to a load bank. The test stand would be used for...
We have a DC motor (Nameplate: GE Kinamatic DC Motor, 20 Hp, 1750 rpm, 240 volts, Shunt Wound, Field volts 150, type CD366AT, TENV) and an old controller of unknown origin with no documentation found as of yet - likely a one-off custom. The load is a much larger motor (~100 times DC motor rated...
