ROCOF
Monitoring the rate of change of frequency
    Key features include:
  •   Advanced substation data recording
  •   Capturing event and fault data in high resolution
  •   Ability to detect slight changes in frequency
  •   Compatible with full suite of Fischer Block sensor devices
  • DATASHEET
    DETECTING HARMFUL FREQUENCY DEVIATIONS
    Distributed generation, where a local generator is connected directly to the distribution network, are becoming widespread. This scenario creates a new challenge for grid operators: how to ensure that the system behaves safely and predictably if the local generator becomes isolated from the network, a condition known as islanding.

    There are numerous potential hazards associated with islanding, including the safety of repair personnel who may not be aware of which lines are included in the energized island. Another hazard is that the generator may continue to supply local loads but, without support from the network, this may result in it being heavily overloaded. The solution usually adopted to address these hazards is to immediately shut down the islanded generator, but this can only be done if a fast and dependable way of detecting islanding is available such as ROCOF protection.

    ROCOF protection relies on the fact that once a generator is islanded, its output frequency will no longer be locked to that of the network and will change rapidly to a frequency determined by its own characteristics and those of the loads it is still supplying.
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