Siemens SIPROTEC 7VU681, User Manual

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Introduction
1.1 Application Scope
SIPROTEC, 7VU681, User Manual
C53000-G1176-C368-1, Release Date 07.2012
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1.1 Application Scope
In power plant, industrial plant and network substation, in order to ensure the continuity of load operation, two
power supplies are provided for important loads . One power supply is working as the operating power supply,
another is the backup.
When the operating power supply is shut down because of system fault or equipment maintenance or
deliberate operation, the load busbar will be transferred to the standby power supply immediately by the power
supply transfer devices.
1.2 Function Configuration
7VU681 supports the power supply transfer between transformers, lines and busbars. You can also define own
ATS logic through CFC.
Besides power supply transfer functions, 7VU681 have the protection functions, the protected object is the tie-
CB of the busbar. When the standby power supply is connected to a fault source by a power supply transfer
operation, the standby power supply can be disconnected immediately. When the tie-CB is closing, if a busbar
is fault, the tie-CB will be opened immediately and the power supply transfer operation will be blocked.
7VU681 have the load-shedding function to maintain the system stability after busbar transfer.
1.3 Characteristics
General
• Low power consumption, good for device long-term running.
• Powerful information recording with fault record, event log , trip log etc.
• Powerful analysis and configuration tool - DIGSI.
• Flexible to define own logic by CFC.
• Support protocols: IEC61850, Redundant T103, T103, ModBus and ProfiBus - DP.
• High qualified Hardware, good performance of EMC.
ATS
• Support typical transfer modes.
• Support user defined logic.
• Protection functions for tie-CB integrated.
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