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Bus Cable for Time Synchronization



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    The evaluation of fault records, operational alarms and fault signals calls for millisecond-accurate determination of the absolute time. The SIPROTEC 4 units have an internal clock on a quartz basis, which deviates from the normal time after a while. Radio clocks are therefore used for precise synchronization; they set the clocks in the devices via time signals or protocols such as DCF77 or IRIG-B. All the devices are connected in parallel with an electrical bus, so that all of them receive the time information at the same time at Port A. By means of the prefabricated bus cables and adapters 7XV5104 the SIPROTEC 4 units can be connected via their IRIG-B interface directly to the sync.-transceiver 7XV5654. The maximum length of the electrical bus when prefabricated cables are used is 20 m. Relevant applications are described in the manual for the sync.-transceiver 7XV5654.

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