ERL Fault Indicators are powered by the electric field potential gradient induced by an energized high-voltage power line. The ERL displays a faulted line condition by showing a large reflective red target. The red target remains visible until after the line is re-energized.
ERLs can be installed on energized lines using a single hot stick. The hermetically sealed UV-stabilized housing and stainless steel clamp make the ERL tough enough to handle harsh outdoor environments.
Energy-Harvesting, Battery-Free Automatic Reset—Apply at strategic intervals along overhead conductors and at midfeeder disconnects to minimize fault-finding times and optimize reliability statistics. The inrush restraint feature prevents false tripping during recloser operations, and the unit automatically resets upon restoration of system voltage. A reflective red target (largest in the industry) is easy to spot. No battery is required. Use for maintenance-free fault indication.
Low Load Current—Install the ERL Electrostatic Reset where there is insufficient load current to power a current reset fault indicator. These sensors use voltage for power and reset
|Power Source||Electric Field Potential Gradient|
|Nominal Trip Ratings||50 to 1200 A|
|System Voltage Range (L-L)||10.35 to 69 kV|
|Reset Time||Approximately 20 Minutes at 6 kVL-N (Higher Voltages Result in Quicker Reset.)|
|Display||Reflective Red Target|
|Maximum Fault Current||25 kA for 10 Cycles at 60 Hz|
|Trip Response Time||1 ms|
|Inrush Restraint Response Time||300 ms|
|Outer Diameter Clamping Range||0.30" to 1.40" (Please Specify Clamping Diameter or Range When Ordering.)|
|Housing Material||UV-Stabilized Polycarbonate Resin|
|Clamp Material||Stainless-Steel Clamp With a UV-Stabilized Rubber Sleeve|
|Approximate Weight||240 g (0.53 lbs)|