Electrical short-cicruit monitoring arrangement for variable-spe

Details Electrical short-cicruit monitoring arrangement for variable-spe Electrical short-cicruit monitoring arrangement for variable-spe

1985-11-15

1987-07-21

Envall, Jr., Roy N.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 23, 361 28, H02H 708

Patent

active

046822631

ABSTRACT:
An electrical short-circuit monitoring arrangement for a three-phase motor, including its supply lines, whose speed is controlled by a constant-current d.c.-link converter. The harmonic ripple voltage superimposed on the motor voltage generated as a consequence of the commutation by the constant-current d.c.-link converter at the output of the converter is determined, filtered, and supplied to a phase-monitoring unit, which when dropping below a selected amplitude variable of the harmonic voltage of at least one phase, triggers the switching module whose switching mechanism activates a disconnect switch to interrupt the motor circuit upon occurrence of a switchoff signal.

REFERENCES:
patent: 3662182 (1972-05-01), Ullmann et al.
patent: 3824430 (1974-07-01), Hentschel
patent: 3919600 (1975-11-01), Son
patent: 4133413 (1979-01-01), Watanabe
patent: 4340920 (1982-07-01), Gill et al.
patent: 4439806 (1984-03-01), Braider

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