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Fault indicators
Type FLA3.1 series

The fault indicators of the type FLA3.1 series are used in overhead lines of a network. The indicators can be mounted under live conditions with the help of an adapter and a hot stick. The indication is either done by six flashing LEDs for a clear nighttime visibility and three red display areas for a clear daytime visibility. Or it is done by an ultra-bright LED with a focussing lense for optimum visibility during day- and nighttime.

The indicators of the type FLA3.1 series can communicate to a remote control via a bidirectional wireless connection. In this way all settings of the indicators can be adjusted at any time without removing the indicators from the powered line. The FLA3.1 series 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 indicators of the FLA3.1 series can be adapted to auto-reclosers in the network. This provides an optimized fault indication and also allows the indication of different types of faults. 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.

Advanced fault detection

The fault indicators of the type FLA3.1 series use different methods to detect faults.

Detection method FLA3.1 FLA3.1V FLA3.1VL
absolute threshold X X X
automatic mode X X X
di/dt detection method   X X
indication flag + LED flag + LED ultra-bright LED
with focussing lens

Any of the methods can be enabled or disabled as required.

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

The fault indicators of the type FLA3.1 series can also 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.

Order Data
Type FLA3.1   40.40.10
Type FLA3.1V   40.46.10
Type FLA3.1VL   40.47.10
Remote Control Type HS | for type FLA3.1  40.30.10
Remote Control Type HS | for type FLA3.1V  40.37.10
Remote Control Type HS | for type FLA3.1VL  40.37.10
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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