Setting the System FLISR Mode
FLISR supports four different modes of operation:
• Disabled: Disables FLISR from calculating, generating or executing a restoration solution. FLISR still automatically performs disables/enables functions.
• Manual: Places FLISR in manual mode, where restoration solutions are automatically generated but must be manually executed by the operator via a switching sheet generated from the FLISR tool.
• Automatic: Places FLISR in automatic mode, which automatically generates and executes switching sheets.
• Restore Only: Places a feeder in FLISR Restore Only mode, which allows the feeder to be used for restoration for faults occurring on connected feeders, but not for faults on the feeder.
• Disabled (Load Shed): This FLISR mode is set when a designated SCADA measurement is asserted; it disables FLISR for entire NMS instance. When the SCADA measurement is de-asserted, the systems sets FLISR back to its previous mode. When the FLISR mode is set to Disabled (Load Shed), you cannot change the FLISR mode to Manual or Automatic (using the Web Workspace Tools menu); you can only change the mode to Disabled, so that when the measurement is de-asserted, the FLISR mode stays Disabled.
To set the FLISR mode, from the Web Workspace
Tools menu, select
DMS Settings, then select
FLISR Mode, and then select the desired mode (
Disable,
Manual, or
Automatic). These modes (and
Restore Only mode) can be set for individual feeders through the Configuration Assistant's Feeder Management tab (see
Using the Feeder Management Tab on page 24-32 for details). In effect, FLISR will run the minimum of the system wide mode and feeder mode.
FLISR can also be configured for phase-operable mode. By default, FLISR phase-operable mode is off, but it can be set using the 'FLISR Single-Phase Mode' SRS-rule (see
“Using the Event Management Rules Tab”). The rule may be set to the following values:
• 0: ganged mode.
• 1: for un‑ganged mode minimizing momentary faults. This is a make-before-break mode where FLISR creates a parallel on the non-faulted phases before opening the downstream isolation switch. However, this approach has the potential to cause the neutral imbalance on the restoring feeder. If the negative neutral current goes above the threshold, it causes the neutral-over current relay to trip. To avoid such scenarios, FLISR evaluates its restoration plans and, if the plan has potential to cause the neutral-imbalance, it opens the downstream isolation switch in all three phases just as in mode 2 described below.
• 2: un‑ganged mode avoiding making parallels on the faulted feeder. In this mode, downstream isolation switch is opened in all three phases before closing the restoration switch.
FLISR single-phase mode operation relies on the presence of phase-operable devices. When the tripped breaker is ganged operated, FLISR treats the event as a 3-phase outage event. However, if phase operable devices are present below the tripped breaker, FLISR can use them for single-phase operation if the
FLISR Enable Single Phase Operation on Ganged Trip SRS-rule is set to
yes; see
“Using the Event Management Rules Tab” for information on setting rules.
Understanding the Number of Retries for a Timed Out Step
If no response (related to a switching action) from SCADA is received within the configured timeout period, then the switch step status will be set to a value of Failed. When the FLISR plan is executed in automatic mode or when the plan is manually executed using the Execute the entire plan toolbar option, the plan execution can retry a timed out step for a configurable number of times before it sets the switch step status to Failed.