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    Automatically, quickly and safely improving service reliability.

    Fault Location, Isolation & Supply Restoration (FLISR)

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Customers today have a high dependence on reliable energy for their every day productivity and convenience. Service feeders can experience faults due to natural effects, man-made situations, or from equipment failures, causing customers to experience service interruptions. Knowing where these faults are, limiting the total number of customers that are impacted by these faults, and quickly restoring power to customers are issues that utilities continually face.
  • Solutions

    The FLISR process includes the following steps/applications:
    1. Fault Location: Locating the part of the feeder with the faulted network element (e.g. faulted cable or overhead section) using appropriate methods. These methods take into account all deployed equipment in the distribution system for fault detection and location.
    2. Fault Localization: Locating the part of the feeder with the faulted element using remotely and/or manually controlled switching devices. This step is used for feeders without deployed equipment for fault location, such as fault indicators and fault measurements.
    3. Element (Fault) Isolation: This step isolates the faulted element from the remaining part of the feeder.
    4. Service Restoration: Re-supplying of de-energized sections on the faulted feeder via switch orders.
    5. Return to Normal State: Returns the network to the state before the fault occurred.
  • Value Proposition

    To maintain reliable service, Schneider Electric’s FLISR application provides the optimal plan of control actions for detecting, locating, and isolating faults and restoring power on a distribution feeder.
    Using the FLISR application, operators can most efficiently use existing field equipment in order to minimize the duration of the outage and undelivered energy — thereby improving SAIFI, SAIDI, and related indices — for different feeder configurations with various level of protection and automation.
  • Differentiation

    Automatic (Closed Loop) Mode – FLISR can be run in a fully automated mode. Fault Location is executed without operator interaction when a permanent fault on a feeder is detected. Fault Location execution is followed by automatic execution of Element Isolation and Service Restoration, in sequence.


  • Default Alternative Text
    FLISR (Fault Location, Isolation and Supply Restoration) is a collection of tools used for detection, location, and isolation of faults and restoration of supply for de-energized customers. FLISR can be used in manual, semi-automatic, and automatic mode. Each applications that is part of the FLISR solution is also available as a separate application.
    Fault Location (FL) supports detecting the location of the fault. It calculates the locations where faults could have occurred by analyzing the fault pattern along with available real-time information acquired from field devices, including fault indicator outputs, fault magnitude at various locations on the feeder, and protective relay tripping.
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    Element Isolation (EI) determines which switching manipulations are needed for isolating selected elements, using defined types of equipment for isolation.
    Supply Restoration (SR) is used for determining the optimal plan of switching actions for restoring supply to the de-energized parts of the distribution network.
  • Aerial view of a smart city at night, smart buildings.
    Large Area Restoration (LAR) determines the plan for restoration of the supply of large parts of the distribution network, which remained de-energized after a fault occurrence on a supply transformer (HV/MV transformer) or MV busbar in a supply station (HV/MV station) or after isolation of an element for the maintenance purpose in supply station.