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I need to know sources of replacement parts for a vintage 1960 Allis-Chalmers (A-C) circuit breaker used in a metalclad switchgear lineup? I have already contacted Siemens, who purchased the circuit breaker division from A-C, but haven't heard anything.

Can anyone tell me what the advantages are for using high voltage undergound cable with a tape shield?

We have a long, three-phase distribution line without a neutral, which powers six delta-connected transformers. The system has NO ground fault (GF) protection, but simple inverse time phase overcurrent protection. Whenever a line segment comes down, it remains energized (high-impedance fault)...

Has anyone had any experience with Cooper's skid mounted compact substations?

Does anyone know of a source of positive and zero sequence impedance data for various sizes of high voltage underground cables? Ex: 4/o aluminum, 15kV, concentric neutral, 220-mil EPR insulation The websites for Okonite, Kerite, etc. have very minimal data for this, and do not...

Does anyone out there use neutral grounding resistors on the neutral(s) of the distribution substation transformer WYE secondary windings? I have a situation involving a distribution substation with high ground fault current, in which the electronic feeder protection module (I'll use the...

Can anyone tell me what the primary advantage in using a conservator tank on a substation power transformer is?

I have a situation in which the substation source (12.47 kV, L-L, grounded-wye) is feeding a 500 KVA, 3-phase padmounted distribution transformer (delta-connected primary windings). There are surge arresters connected phase-ground at the phase connections on the primary side of the padmounted...

I have a situation where I need a jacketed, concentric neutral, underground cable of size 1500 MCM (minimum) per phase. Looking back on past experience with failed HV jacketed underground cables, it is *highly* desirable to install a cable whose size does not exceed 500 MCM per phase, in order...

I need to spec. a standby diesel generator, to supply power to an office building, with computer equipment, elevators, and HVAC units. The office building is currently supplied by a three-phase delta connected (secondary) single phase transformer bank. The seconday voltage configuration is...

Is or are there anybody or anyone extensively purchasing and installing the amorphous core transformers? We bought a 2500 KVA G.E. amorphous core unit seven (7) years ago, and the core losses were so small, they were almost negligable, but the price of the amorphous unit was almost double. I...