Schweitzer Engineering Laboratories
Newsroom
Mar 19, 2024
Introducing the SEL-787L Line Current Differential Relay
PULLMAN, Washington—Schweitzer Engineering Laboratories (SEL), a global leader in power system protection, automation and control solutions, has introduced the SEL-787L Line Current Differential Relay, which delivers economical, fast, secure and dependable line current differential protection for distribution and industrial applications.The SEL-787L features advanced algorithms that detect faults and initiate rapid, precise tripping actions while safeguarding against communication disturbances and asymmetry without depending on an external time source. The SEL-787L provides both line current differential and overcurrent protection in a single, compact unit. It maximizes simplicity by supporting both point-to-point or multiplexed IEEE C37.94 communications using single-mode or multimode fiber. The SEL-787L is the latest addition to the SEL-700 series family and offers all the same popular features, including:
- Arc-flash protection.
- A 5-inch color touchscreen display.
- All widely used communication and time protocols.
- A small form factor.
- Low-energy analog voltage and current inputs (Rogowski coil and low-power CT).
- Flexible I/O options.