SEL provides reliable and secure distance protection that can be applied with or without communications and can function as a backup for communications-dependent line current differential protection.Distance protection solutions include:
- Quadrilateral and mho distance elements—SEL transmission relays allow you to choose either or both.
- Optimized system loading—Built-in load encroachment logic allows you to securely apply distance protection elements on heavily loaded transmission lines.
- Improved system stability—The SEL zero-setting out-of-step (OOS) blocking function improves security during power swings without requiring time-consuming and expensive system stability studies.
- Communications-assisted tripping—SEL transmission protection relays accommodate many of the common pilot protection schemes, so you can configure protection without any need for external coordination devices.
Communications-Assisted Protection
Implement communications-assisted tripping and remedial action schemes (RASs) with SEL networking and control products.