Apparatus for insuring the security of output signals from prote

Details Apparatus for insuring the security of output signals from prote Apparatus for insuring the security of output signals from prote

1992-03-17

1994-05-31

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific circuit breaker or control structure

361 62, 361 81, H02H 300, H02H 305

Patent

active

053174720

ABSTRACT:
In a protective relay (10), which contains a microprocessor (30), for monitoring a power transmission line, an output enable decoder (72) and a one-shot timer (74) produce a very short (5 microsecond) signal in response to an address signal from the microprocessor. The output from the timer is applied as one input to AND gate (70). A conventional address decoder, responsive to an address signal identifying a particular output port from the microprocessor, provides another output to AND gate (70). AND gate (70) produces a latch control signal when the two signals are coincident in time. The latch control signal enables the particular output port to receive instructions from a data bus (60).

REFERENCES:
patent: 4314301 (1982-02-01), Kondow et al.

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