The fault indicator type FLA3.1VL 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 indication is done by an ultra bright flashing LED.
The FLA3.1VL 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 FLA3.1VL stands out for the great flexibility of the adjustments that can be done. Besides the basic settings of the indicator like trip current, response delay, reset time, etc., the FLA3.1VL can be adapted to auto-reclosers in the network. This provides an optimized fault indication and also allows the indication of different fault types. Permanent and temporary faults can be distinguished and indicated separately by an additional green bottom LED. The bidirectional connection between the remote control and the fault indicator allows you to read out the present current of the monitored network and the internal temperature of the indicator with the remote control at any time.
The fault indicator type FLA3.1VL can be connected to the remote indication interface type RIS. This allows an easy-to-install and retrofittable integration of the overhead line indicators into remote monitoring systems.
Advanced fault detection
The fault indicator type FLA3.1VL has two fault detection algorithms. It provides a short-circuit detection with a fixed or automatically calculated absolute current threshold as trip value. The short-circuit detection can also be switched off completely. Additionally, the fault indicator type FLA3.1VL provides earth-fault detection. This works with a di/dt measurement method that analyses the current load change within a certain time. The increase of the required current load change can be adjusted. A subsequent voltage loss is used as an additional criterion to detect earth-faults. Like the short-circuit detection, the earth-fault detection can be switched off completely.