Switching device for the protection of direct current devices

Details Switching device for the protection of direct current devices Switching device for the protection of direct current devices

1975-01-03

1976-06-29

Miller, J D

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

317 40R, 320 36, 320 48, 320 40, H02H 718

Patent

active

039671690

ABSTRACT:
A switching device for the protection of direct current devices such as accumulators, direct current machines and direct current devices, against for example excess current, excess temperature and low tension voltage.
The switching device comprises first and second excess current switches. The first switch comprises a break point and a thermal and/or electromagnetic tripping device and the second switch comprises a break point and an electromagnetic tripping device having a high resistance coil. The break point of the first switch is connected in parallel with the tripping device of the second switch. When an excess current occurs, the break point of the first switch opens, leaving the tripping device of the second switch in circuit and this opens the break point of the second switch.
The device further includes an electronic control circuit having at least one transducer for monitoring changes in at least one parameter of the direct current device to be protected. This circuit controls the gating-on of a thyristor which, when gated-on, trips the first and second switches.
The control circuit may include a resistance thermometer for monitoring a temperature in the device which is compared with a nominal temperature and/or means for monitoring the voltage across the device and comparing it with a nominal voltage.

REFERENCES:
patent: 3349386 (1967-10-01), Zug
patent: 3421066 (1969-01-01), Flynn et al.
patent: 3447060 (1969-05-01), Tedd
patent: 3576488 (1971-04-01), Zug et al.
patent: 3667025 (1972-05-01), Campbell et al.
patent: 3686530 (1972-08-01), Bogut
patent: 3708738 (1973-01-01), Crawford et al.
patent: 3786342 (1974-01-01), Molyneux
patent: 3852652 (1974-12-01), Jasinski
patent: 3852732 (1974-12-01), Yorksie et al.

Affiliated with

Also associated with

Rating

Switching device for the protection of direct current devices does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Switching device for the protection of direct current devices, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Switching device for the protection of direct current devices will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1280866