Electronic switchgear, preferably operating contact-free

Details Electronic switchgear, preferably operating contact-free Electronic switchgear, preferably operating contact-free

1988-07-07

1990-04-17

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

361179, H01H 3500

Patent

active

049183265

ABSTRACT:
An electronic switchgear operating contact-free, having a presence indicator which can be externally affected, a switching amplifier disposed downstream of the presence indicator an electronic switch controllable by the presence indicator via the switching amplifier a supply circuit for the provision of the supply voltage for the presence indicator and for the switching amplifier and a delay circuit preventing activating pulses. The supply circuit has a voltage and/or current regulator. In the electronic switchgear in accordance with the invention activating pulses are prevented with a higher degree of assurance than in the state of the art, namely based on the fact that the delay circuit becomes active, i.e. the delay time starts, only after the voltage and/or current regulator has started to operate.

REFERENCES:
patent: 4031408 (1977-06-01), Holz
patent: 4138709 (1979-02-01), Colwill
patent: 4336491 (1982-06-01), Buck et al.
patent: 4543527 (1985-09-01), Schuchmann et al.
patent: 4663542 (1987-05-01), Buck et al.
patent: 4672230 (1987-06-01), Spahn
patent: 4731548 (1988-03-01), Ingraham
patent: 4757341 (1988-07-01), Tanigawa
patent: 4792764 (1988-12-01), Walker et al.
Patent Abstracts of Japan E-109 May 28, 1982, vol. 6, No. 91.

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