SEL electric field reset fault indicators

Mount E-ERL fault indicators on bare or covered overhead lines using one of three different clamping styles. In addition to the Standard option, SEL offers two other clamping options, Constant Calibration and Snap Action. The Constant Calibration Clamp option maintains nominal trip rating accuracy (+/- 10%) throughout the clamping range. To use the E-ERL in switchgear applications, add the Snap Action Clamp option: it allows the E-ERL to fit easily on the barrel of the lug.

E-ERL fault indicators with snap action clamps work well on livefront switchgear: simply clamp the E-ERL onto the barrel of the cable termination lug.

Utilities and other users typically apply E-ERL fault indicators on overhead conductors on main line feeders: one set at the first upfeed and one set at each tap location. Locate the indicators so that it is easy to identify whether the fault location is on the tap or further down the feeder. Installing E-ERLs before each downfeed and after each upfeed allows the utility to determine whether the fault is in the underground section. Installing one of EOS Manufacturings many models of underground fault indicators can help to further narrow in on the location of the fault along the underground portion of line. Midfeeder disconnects provide another optimal location for E-ERLs. Once a lineman is dispatched to the midpoint, he opens the midpoint and uses the E-ERL to determine which half of the feeder contains the fault. Then, the utility can quickly restore half of the feeder while the lineman patrols the remaining half of the feeder.