Maintain line current-differential (87L), and communications-assisted (POTT, DCB) pilot tripping schemes during bypass operations.

Rear View (138 KB)

• High-Speed Communications
  The SEL-2126 has a data delay of less than 10 µs. This is 400 to 1,000 times faster than traditional digital devices.
• Flexible Relay Communications
  Reroute communications from up to six pairs of line protection relays to either or both of two transfer relays.
• Fiber-Optic IEEE C37.94 Interface Compliance
  Replace expensive interface converters with the SEL-2894 or the SEL-3094 to reliably and economically link multiplexers to any devices, by using the fiber-optic standard interface IEEE C37.94 for all relay-to-relay communications.
• Multiple Communications Protocols,
  One Transfer Switch
  Simply reroute any communications protocol carried on the IEEE C37.94 fiber-optic interface standard without moving fiber connectors and without changing communications equipment programming.

• Preserve high-speed line protection by not disabling communications-assisted tripping schemes (POTT, DCB, 87L) during circuit-breaker or substation-bypass maintenance operations.
• Maintain primary and backup protection communications during circuit-breaker operations on main-bus/transfer-bus or single-breaker double-bus configurations, or during substation-bypass operations or three terminal line applications.
• Perform local or remote relay testing, routing both local and remote relays to the transfer ports.
• Use the 16 contact inputs to control fiber-port routing, and use the two output contacts to report the system status.
• Change group protection settings automatically on the transfer relay to match the bypassed-relay protection settings, or use an SEL-SSE, SEL-SSP, or any other selector switch.

Main-Bus/Transfer-Bus Application Diagram

Budgetary Retail, Quantity 1: $2,730
(Prices displayed are for planning purposes and are subject to change. Contact your SEL sales representative today for a quote on configurations and quantities to meet your needs.)

• SEL-2126 Fiber-Optic Transfer Switch
  (PDF Version)

• Using the SEL-2126 Fiber-Optic Transfer Switch and the SEL-321-1 in Bypass-Breaker MIRRORED BITS Communications-Assisted Tripping Schemes

• Quickly Switch Fiber-Optic Communications

Front View

• .pdf version

• .dwg version

Rear View

• .pdf version

• .dwg version

Dimensions

• .pdf version

• .dwg version

Main-Bus/Transfer-Bus Application

• SEL-2126 Instruction Manual

• SEL-2126 Guideform Specification