OUTPUT CONTACT FAILURE MONITOR FOR PROTECTION RELAYS IN ELECTRIC POWER SYSTEMS

    公开(公告)号:US20220368125A1

    公开(公告)日:2022-11-17

    申请号:US17316939

    申请日:2021-05-11

    Abstract: Output circuit devices for use in electric power systems may include a first output subsystem for transmitting a first signal output via an output port to a component of the electric power system, an input subsystem for receiving and monitoring the first signal output transmitted by the first output subsystem, and a second output subsystem for transmitting another signal output to the component of the electric power system. The second output subsystem is to transmit the signal output in response to an indication from the input subsystem. Intelligent electronic devices (IEDs) and associated methods may include one or more output circuit devices.

    Duty cycle modulated universal binary input circuit with reinforced isolation

    公开(公告)号:US10862298B2

    公开(公告)日:2020-12-08

    申请号:US15950964

    申请日:2018-04-11

    Abstract: According to various embodiments, an intelligent electronic device IED, such as a protective relay, includes a universal binary input circuit for receiving an AC or DC binary input with a voltage magnitude between approximately 0 Volts and 300 Volts. The universal binary input provides reinforced isolation via an input protection subcircuit and an optocoupler for communicating an optical signal with an electrically isolated controller based on the received binary input signal. In one embodiment, a duty cycle modulation subcircuit generates a pulse width modulated drive signal to drive the optocoupler based on the voltage magnitude of the received binary input. The duty cycle of the pulse width modulated drive signal is (linearly or nonlinearly) inversely proportional to the voltage magnitude of the received binary input.

    DUTY CYCLE MODULATED UNIVERSAL BINARY INPUT CIRCUIT WITH REINFORCED ISOLATION

    公开(公告)号:US20190319452A1

    公开(公告)日:2019-10-17

    申请号:US15950964

    申请日:2018-04-11

    Abstract: According to various embodiments, an intelligent electronic device IED, such as a protective relay, includes a universal binary input circuit for receiving an AC or DC binary input with a voltage magnitude between approximately 0 Volts and 300 Volts. The universal binary input provides reinforced isolation via an input protection subcircuit and an optocoupler for communicating an optical signal with an electrically isolated controller based on the received binary input signal. In one embodiment, a duty cycle modulation subcircuit generates a pulse width modulated drive signal to drive the optocoupler based on the voltage magnitude of the received binary input. The duty cycle of the pulse width modulated drive signal is (linearly or nonlinearly) inversely proportional to the voltage magnitude of the received binary input.

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