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XMP1 card monitors teleprotection units

Posted: 07 Sep 2010     Print Version  Bookmark and Share

Keywords:XMP1 card  teleprotection units  power grids 

KEYMILE debuts the OptC37, an XMP1 card that interconnects teleprotection units to enable operators and users of high-voltage power grids to monitor the entire transmission link between teleprotection units. It facilitates early error detection in the power distribution network and helps to avoid voltage breakdowns at customer sites.

The teleprotection units are connected to the OptC37 card via a multi-mode fibre. The optical communication between the XMP1 card and teleprotection unit is based on the IEEE C37.94 protocol. This protocol defines a standard for the transmission of n x 64kbit/s signals via optical interfaces between teleprotection units and multiplexers. With the external electro-optical converters used to date, the link status between the teleprotection hardware and multiplexers could not be monitored.

The OptC37 card is equipped with four optical interfaces acc. to IEEE C37.94 for the transparent transmission of n x 64kbit/s signals with n = 1 to 12. The four optical interfaces available are designed in compliance with IEC 60874-10 (BFOC/2.5). This card is targeted for use in the XMP1 and XMP1-SL subrack. In both systems, it occupies one card slot.

The XMP1 cross-connects the n x 64kbit/s data streams of the OptC37 card with other 64kbit/s services and forwards these into the transmission network (backbone). Via the backbone, the data are routed to the XMP1 system located in the next transformer station and are thus used to transmit the measuring values of the two teleprotection units linked by means of a point-to-point connection.

In addition, the XMP1 multiplexers are connected to the control centre of the operator via a management channel, so that all status information is also sent to the ServiceOn XMP1 (SOX) network management system. Thus, a consistent and seamless end-to-end monitoring of the communication path between the individual teleprotection units becomes possible. In case of a fault or failure, the control centre can now remotely identify the exact cause, for example a fracture of the optical fibre or a more serious protocol problem of the teleprotection units and take appropriate measures.

The XMP1 multiplexer available can also be used for further services by installing the corresponding cards. Possible options could include for example functions such as the connection of monitoring cameras, data concentrators or if required emergency telephones with local-battery supply.

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