Fault indicator
Type FLA3.1V

The fault indicator type FLA3.1V is used in overhead lines of a network. The indicator can be mounted under live conditions with the help of an adapter and a hot stick. The FLA3.1V is completely self-sustained by the monitored network from a current flow of 20A upwards. The indication is done by six flashing LEDs for a clear nighttime visibility and three red display areas for a clear daytime visibility.

The FLA3.1V can communicate to a remote control via a bidirectional wireless connection. In this way all settings of the indicator can be adjusted at any time without removing the indicator from the powered line. The FLA3.1V stands out for the great flexibility of the adjustments that can be done. Beside the basic settings of the indicator like trip current, response delay, reset time, etc., the FLA3.1V can be adapted to auto-reclosers in the network. This provides for an optimized fault indication and also allows the indication of different fault types. Permanent and temporary faults can be distinguished and indicated separately.

The bidirectional connection between the remote control and the fault indicator allows to read out the present current of the monitored network with the remote control at any time.

The fault indicator type FLA3.1V can be connected to the remote indication interfaces type RIS-FR and RIS-FS. This allows an easy-to-install remote indication solution for the overhead line indicators.

Advanced fault detection

The fault indicator type FLA3.1V provides two methods to detect faults. The absolute threshold detection method works with a selected fixed or an automatically calculated absolute threshold. This method can be disabled when not required.

Additionally the fault indicator type FLA3.1V provides a di/dt measurement method. This method analyses current load changes that happen within a certain amount of time. The level of load change can be adjusted.

A subsequent voltage loss is used as an additional criterion to assure correct detection of a fault. This method can also be disabled when not required.

The fault indicator type FLA3.1V can be integrated into a SCADA system via the remote indication interfaces of the type RIS series.

Order Data
Type FLA3.1V | for overhead-lines 40.46.10
Remote control type HS | for indicators type FLA3.1V  40.36.11
Mounting adapter | bayonet type 40.52.10
Mounting adapter | clamp type 40.52.11
Mounting adapter | universal spline type 40.52.12

Features and Benefits

Operation in overhead line networks
Easy and full configurability with a remote control
Bidirectional wireless connection to a remote control
Trip current fixed threshold:
– selectable between 20 and 1500 A in steps of 20A
– Automatic setting of the trip current depending on service current
Trip current di/dt:
di/dt measurement and subsequent voltage loss
di: selectable between 5 and 100 A in steps of 5A
dt: 20ms at 50Hz / 16ms at 60Hz
Response delay selectable between 40 ms and 300 ms in steps of 20 ms
LED indication and red display area
Test function by remote control
Reset function:
– Manual by remote control
– Time: selectable from 30 min to 12 h in steps of 30 min
– Reset by recovering network current or voltage enabled/disabled
Power supply:
Lithium battery type A 3.6V
Capability of connecting to SCADA systems via remote indication interfaces type RIS-FR and RIS-FS
Bidirectional communication to a remote control
Inrush current restraint of 2 seconds
Measuring of the network current by remote control
Checking of the voltage status by remote control
Measuring of the internal system temperature of the device by remote control
Detection and indication of
– Permanent fault
– Temporary faults
– Transient currents
Configuration regarding to auto-reclosers for optimized fault detection


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