We have a hydro powerhouse with 750KW 40Hz generators with 40 poles. We cannot increase the rotor speed to produce 60Hz. power. We have been told that the stator can be rewound to produce 60Hz. It seems like this would need 1.5 stator windings per rotor pole. There is only one winding per slot...
I am looking for a sensor to mount on a vented oil level sight gauge so that I may visually see the oil level and sense when it goes low (and maybe another one for high). Sensor could be a proximity type or an optical type. Most level switches are designed to be in a fixed location, and you...
Unusual transfomer phasing question.
34.5KV/2400V Delta/Wye station stepdown transformer. CT's on the primary are connected wye. I need to use an existing multifunction relay connected to these CTs to monitor power consumption in the transformer, and so need primary voltage. I do not have PTs...
Weird situation. Antique hydroelectric plant, three 750KW 40Hz, 120RPM generators driving a 2.5MW 40Hz. motor, shaft coupled to a 60Hz. generator. Yes, 40Hz. generators.
Power from ONE generator fluctuates 200 - 300KW when paralleled with one or both other generators. Stable when only the one...
I'm trying to size power cables between switchgear and two generators. Each generator is rated 722A at 2400V. I want to use 2 500MCM MV90 conductors for each phase, 3 conductors in each of four conduits. If I arrange them 2h x 2w, cable is rated 344A, not enough. If I had only one generator...
We've had trouble with overheating on connections to an 85A contactor. Not sure if lug was improperly tighteded at installation or it just loosened from thermal cycling, or we may be pushing the IEC contactor too far, overheating the contact that then overheated the wire. Burned off the wire &...
Anybody know the definition of LOAD DIVERSITY for adjusting the ampacity of conductors in a raceway? Table B.310.11 allows increasing the ampacity of conductors in a raceway, but I can't find a basis for determining what is 50% load diversity.
I need 18- 10ga. conductors to feed a batch of 1KW...
I am working in an older hydroelectric powerhouse. Original generators had two sections, one at 800KW @4160V, the other at 1MW 250VDC. Exclusively powered an industrial plant. In '70s DC was removed, and AC section was rewound for 1.5KW @4160V. River is tidal at this location, and at low tide we...
