Permanent availability of electricity is essential for reliable production of a great number of processes in power stations and industrial plants where lots of inductive motor are installed. To achieve this, a busbar is normally equipped with two or more independent in-coming 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 small impact to 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.

Functions of TY8661Q:

 High speed busbar transfer function 

• Starting conditions

- NORMAL condition

- FAULT condition

- Inadmissible under-voltage

- Inadmissible under-frequency

- Inadmissible df/dt

- Reverse power

- 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 w. 2-CB, sectionalized single busbar 

w. 3-CB and single busbar w. 3-CB 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

 Protection functions for tie-CB

 • Overcurrent protection

 • Ground overcurrent protection

 • Overcurrent protection against switch-onto-fault

 • Ground overcurrent protection against switch-onto-fault

 Monitoring functions

 • Self-supervision of the device

 • Oscillographic fault recording

 • Phase sequence of busbar voltage

 • Voltage circuit of busbar and line

 Communication interfaces

 •  Modbus RTU 

•  IEC 61870-5-103, Ethernet

Application: 

It is specially suitable for the fast motor busbar transfer of: 

• Coal-fired power station 

• Gas-fired power station

 • Combined cycle power station 

• Integrated gasification combined cycle (IGCC) power station  

• Nuclear power station 

• Chemical plant 

• Petrochemical plant  

• Refinery plant 

• Iron and steel plant 

• Cement plant