Line disturbance monitor

Details Line disturbance monitor Line disturbance monitor

1982-03-18

1984-11-20

Krass, Errol A.

Boots, shoes, and leggings

340518, 340538, G01R 1900

Patent

active

044842902

ABSTRACT:
A monitor (FIG. 1) of disturbances of normal voltage/current parameters of a power line 12 consists of input A/D conversion means 18 by which the actual parameters are sampled and digitized and applied to a store 36 controlled by a main microprocessor 30. A real time clock also provides time markers which are stored as flags with the sample data. The store has a plurality of locations which are addressed in a loop whereby newly digitized sample data replaces that stored previously. A secondary microprocessor 54 also receives the digitized measured parameter data which it compares with stored nominal parameter data to detect a disturbance, the detection causing the store to store subsequent sample data sequentially in different locations. Thereafter the main processor reads the data from the store to provide samples stored prior to, and subsequent to, the disturbance and the real time relationship between them. The data read from the store is reproduced on a dot-matrix printer 62 in graphical form related to the real time markers and the information relating to the disturbance printed alphanumerically to a higher degree of accuracy than the printer resolution permits. The data may be stored on a removable floppy disc 112 for reproduction on a high resolution plotter and external event inputs 104 may be provided to cater for a limited number of bistable condition changes considered as disturbances.

REFERENCES:
patent: 3629852 (1971-12-01), Thexton et al.
patent: 3795861 (1974-03-01), Lazenby et al.
patent: 3813667 (1974-05-01), Smith
patent: 3846698 (1974-11-01), Lawton
patent: 3972470 (1976-08-01), Takagi
patent: 4156280 (1979-05-01), Griess
patent: 4291355 (1981-09-01), Dinger
patent: 4328551 (1982-05-01), Yamaura et al.
patent: 4371947 (1983-02-01), Fujisawa
Power Line Disturbance Monitor/Model 3500, Specification Brochure, Franklin Electric Company.

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