SIEMENS SIPROTEC 4 SIPROTEC 7VU683 HIGH SPEED BUSBAR TRANSFER DEVICE

The compact solution HSBT 7VU683 is designed to fit for the primarydiagrams of single busbar (2 CBs) and segmented single busbar (3 CBs). It hasincorporated the traditional HSBT philosophy. Additionally, the unique RealTime Fast Transfer mode helps to improve the efficiency.Permanent availabilityof electricity is essential for the reliable production of a great number ofprocesses in power stations and industrial plants where lots of inductivemotors are installed. To achieve this, a busbar is normally equipped with twoor more independent incoming power sources to provide the possibility to switchto standby source in case of main source interruption or failure.The powersupply interruption with tens of millisecond has a small impact on rotatingloads. Thus, the High-Speed Busbar Transfer (HSBT) device helps to control andmonitor the progress to ensure the fast but reliable switching-over. It can beinitiated manually or automatically.Based on the existing worldwide usedSIPROTEC 4 platform, the reliability, stability, and efficiency of HSBT 7VU683are guaranteed. Thanks to its powerful and flexible performance,multi-functions are integrated into one system, e.g, power supply transfer,relay protection, and supervision.The integrated protective functions are toprotect the tie-CB in segmented single busbar diagram against short-circuit andground fault. The integrated supervision functions are to monitor the voltagephase sequence and voltage secondary circuit, then gives out an alarm in caseof failure.The integrated programmable logic (CFC) allows the users toimplement their own functions. The flexible communication interfaces are openfor modern communication architectures with the control system.

HIGH SPEED BUSBAR TRANSFERFUNCTION1.    Starting conditions- NORMAL condition
- FAULT condition
- Inadmissible under-voltage
- Inadmissible under-frequency
- Inadvertent CB open

2.    Switching sequences- PARALLEL Auto switching sequence
- PARALLEL Half-Auto switching sequence
- SIMULTANEOUS switching sequence
- SEQUENTIAL sequence

3.    Transfer modes- FAST transfer mode
- REAL-TIME FAST transfer mode
- IN-PHASE transfer mode
- RES-VOLT transfer mode
- LONG-TIME transfer mode

4.    Single busbar and segmentedsingle busbar supported5.    High speed contact withapprox.1ms for closing6.    Permission of bi-directionswitching settable7.    Low voltage load-sheddingsettable8.    CB de-coupling when OPEN failed9.    NORMAL start locally orremotely10. Manual CB closing to block HSBT11. ON/OFF set locally or remotely12. HSBT test mode supported 

PROTECTION FUNCTIONS FOR TIE-CB1.    Overcurrent protection2.    Ground overcurrent protection3.    Overcurrent protection forbusbar energization4.    Ground overcurrent protectionfor busbar energization 

MONITORING FUNCTIONS1.    Self-supervision of the device2.    Oscillographic fault recording3.    Phase sequence of busbarvoltage4.    Voltage circuit of busbar andline 

COMMUNICATION INTERFACES1.    PC front port for setting withDIGSI 42.    System interface- IEC 60870-5-103, redundant optional
- IEC 61850, Ethernet
- Profi bus-DP or Modbus RTU

3.    Service interface for DIGSI 4(modem)4.    Time synchronization via IRIGB/DCF 77