Why isn't BLOCKED output signal activating when blocking input is active?

Why isn't BLOCKED output signal activating when blocking input is active?

If a blocking input for a protection, control or monitoring function has been set, the function will generate a BLOCKED output signal when the function has detected a fault and at least one of the set blocking input signals are active as well. BLOCKED output signal will not be activated by the function if only the blocking input signal has been activated.

Below image is a simplified diagram of how function blocking works.


    • Related Articles

    • AQ 2xx Relay Output Guideline

      RELAY OUTPUTS IN GENERAL Generally, protection relay outputs can be used for many different things. Most important usage for outputs in protection relay is clearly controlling the circuit breaker opening and closing coils. This can be done either ...
    • Trip circuit open coil supervision with one digital input and connected trip output

      Trip circuit supervision is used to monitor the wiring from auxiliary power supply trough IEDs binary output and all the way to the open coil of the breaker. It is recommended to know that trip circuit is on healthy state when the breaker is closed. ...
    • Autorecloser final trip signal from individual protection stages

      By default AQ-200 series protection IED Autorecloser function is able to generate only one final trip signal without differentiating between different requests or protection stages. Final trip signal is also not generated at all when autoreclosing is ...
    • Digital input activation troubleshooting

      In case you are having issues with digital inputs not activating when they clearly should be, having a quick look into the Binary Inputs-menu either with AQtivate (shown below) or the relays HMI display. If none of the digital inputs activate the ...
    • Autorecloser final trip signal from individual protection stages

      By default AQ-200 series protection IED Autorecloser function uses the standard method of generating only one final trip signal without differentiating between the 5 requests or protection stages. Final trip signal is also not generated at all when ...