Fiber optic adapter introduced

New adapter converts SEL Relay EIA-485 ports to fiber-optic links.

Pullman, Wash., August 2, 2010—Schweitzer Engineering Laboratories Inc. (SEL) has introduced the SEL-9220 fiber-optic adapter for SEL-300 Series relays. The SEL-9220 mounts directly to the EIA-485 port on the relay connector that is normally occupied by a compression terminal block. It converts the EIA-485 port to a dedicated point-to-point fiber-optic link that is compatible with SEL-2812 fiber-optic transceivers. The SEL-9220 and SEL-2812 use one pair of optical fibers for full-duplex communications of serial data, plus transfer an IRIG-B time signal to coordinate device clocks.

SEL-300 Series relays have two EIA-232 ports and one EIA-485 port on the back for permanent connections. Many applications require three fiber-optic links. SEL-2812 transceivers convert the EIA-232 ports to fiber-optic links, and the SEL-9220 provides the third link.

SEL Senior Engineer Gary Scheer said, “For example, in a generating plant, an SEL-300G generator relay monitors and protects each generator. The SEL-9220 provides the third optical link so the SEL-300G can monitor winding temperatures with an SEL-2600 RTD module, detect field ground faults with an SEL-2664 field ground module, and communicate with a plant control or SCADA system.”

Other applications include SEL-300 Series relays in electrical substations that often use one port to communicate with a substation automation system or SCADA, another for remote engineering access and a third for high-speed relay-to-relay communications for distributed bus protection, main-tie-main-schemes, distribution automation, rapid restoration or remote teleprotection schemes.

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