SIEMENS SIPROTEC 4 SIPROTEC 7VU683 HIGH SPEED BUSBAR TRANSFER DEVICE

The compact solution Siprotec 7VU683 HSBT Device is designed to fit for the primary diagrams of single busbar (2 CBs) and segmented single busbar (3 CBs). It has incorporated the traditional HSBT philosophy. Additionally, the unique Real Time Fast Transfer mode helps to improve the efficiency.Permanent availability of electricity is essential for the reliable production of a great number of processes in power stations and industrial plants where lots of inductive motors are installed. To achieve this, a busbar is normally equipped with two or more independent incoming power sources to provide the possibility to switch to standby source in case of main source interruption or failure.The power supply interruption with tens of millisecond has a small impact on rotating loads. Thus, the High-Speed Busbar Transfer (HSBT) device helps to control and monitor the progress to ensure the fast but reliable switching-over. It can be initiated manually or automatically.Based on the existing worldwide used SIPROTEC 4 platform, the reliability, stability, and efficiency of HSBT 7VU683 are 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 to protect the tie-CB in segmented single busbar diagram against short-circuit and ground fault. The integrated supervision functions are to monitor the voltage phase sequence and voltage secondary circuit, then gives out an alarm in case of failure.The integrated programmable logic (CFC) allows the users to implement their own functions. The flexible communication interfaces are open for modern communication architectures with the control system.

Siprotec 7VU683 HSBT DEVICE FUNCTION

• Starting conditions
  – NORMAL condition
  – FAULT condition
  – Inadmissible under-voltage
  – Inadmissible under-frequency
  – Inadvertent CB open
• Switching sequences
  – PARALLEL Auto switching sequence
  – PARALLEL Half-Auto switching sequence
  – SIMULTANEOUS switching sequence
  – SEQUENTIAL sequence
• Transfer modes
  – FAST transfer mode
  – REAL-TIME FAST transfer mode
  – IN-PHASE transfer mode
  – RES-VOLT transfer mode
  – LONG-TIME transfer mode
• Single busbar and segmented single busbar supported
• High speed contact with approx.1ms for closing
• Permission of bi-direction switching settable
• Low voltage load-shedding settable
• CB de-coupling when OPEN failed
• NORMAL start locally or remotely
• Manual CB closing to block HSBT
• ON/OFF set locally or remotely
• HSBT test mode supported

Siprotec 7VU683 HSBT PROTECTION FUNCTIONS FOR TIE-CB

• Overcurrent protection
• Ground overcurrent protection
• Overcurrent protection for busbar energization
• Ground overcurrent protection for busbar energization

MONITORING FUNCTIONS

• Self-supervision of the device
• Oscillographic fault recording
• Phase sequence of busbar voltage
• Voltage circuit of busbar and line

COMMUNICATION INTERFACES

• PC front port for setting with DIGSI 4
• System interface
  – IEC 60870-5-103, redundant optional
  – IEC 61850, Ethernet
  – Profi bus-DP or Modbus RTU
• Service interface for DIGSI 4 (modem)
• Time synchronization via IRIG B/DCF 77

SIPROTEC 4 leads the way in integrating protection, control, measurement, and automation functions in one device. The homogenous system platform, the unique DIGSI 4 engineering program, and extensive experience of more than a million successfully operating devices in the field worldwide – thanks to these unique advantages, SIPROTEC 4 enjoys top recognition among users worldwide. SIPROTEC 4 is the industry standard for digital protection technology today in all fields of application.