Internal common neutral bus in large three-phase generator

Details Internal common neutral bus in large three-phase generator Internal common neutral bus in large three-phase generator

1985-12-18

1987-02-10

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 68R, 310 89, 310 91, 310176, 310184, 336174, 336175, H02K 1100

Patent

active

046424989

ABSTRACT:
A common neutral bus is formed in a lower frame extension of a large three-phase generator by disposing three sets of neutral current transformers within the lower frame extension and interconnecting the three phases downstream of the neutral current transformers to form an internal neutral bus. The neutral bus is connected to an external neutral transformer through a neutral terminal of small size and low cost. Clamshell clamps are provided in the internal neutral bus for isolating the neutral ends of the generator winding for test purposes. Rigid support of the current transformers and a hollow copper tube passing therethrough permits use of light and low-cost hollow copper tubing in place of the relatively substantial and expensive neutral terminals conventionally required.

REFERENCES:
patent: 3903441 (1975-09-01), Towne
patent: 4029978 (1977-06-01), Jager et al.
patent: 4172984 (1979-10-01), Dagherty et al.
patent: 4254352 (1981-03-01), Fidei et al.
patent: 4488072 (1984-12-01), Archibald et al.
General Electric Illustration for GENERREX.TM. Excitation System.
"Technical Overview through Development of the Largest Scale Turbine-Generator Model with Full Water Cooling", authors unknown, submitted to 1984 IEEE/PES winter meeting.

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