ABB 3BHS901067 Synchronizing and Paralleling devices and systems Data sheet

ABB 3BHS901067 Synchronizing and Paralleling devices and systems 

ABB Switzerland Ltd is a world-leading manufacture of synchronization equipment.  Application-oriented solutions are developed, produced, commissioned and serviced.

Advantages

• Maximum reliability  

• Guaranteed availability  

• Lowest project-engineering costs  

• Quick commissioning using convenient PC tool SynView  

• Synchronizes up to 7 power circuit breakers with different requirements  

• Design 100 % compliant with CE guidelines  

• Advanced technology  

• Universal use  

• Decades of experience with synchronization systems  

• After-sales service: 24 h hotline 365 days a year & remote servicing via the internet  

• Training program for commissioning and service personnel

Variety of applications

Synchronization units are widely used in power stations or industrial installations with their own  power generating facilities, where the generators need to be paralleled with an island line or a  public line, or in power distribution systems.

Power circuit breakers may only be closed if both voltages are at least approximately  synchronous (coincident). Otherwise, faults in line operation, loading of the generators and, in  extreme cases, damage to the generators can result.

SYNCHROTACT® 5 performs these functions safely and reliably, whether as a monitoring  element for manual paralleling or as an independent fully-automatic synchronization unit.  

SYNCHROTACT® 5 covers the following areas of application:

1. Automatic synchronization and paralleling of synchronous generators with line.

2. Automatic paralleling for synchronous and asynchronous lines, transmission lines and  busbars.  

3. Paralleling monitoring (synchrocheck) for the monitoring of automatic or manual paralleling  procedures including the connection of voltage-free lines (dead bus).

Clearly-structured principle of operation

The synchronization and paralleling process can be divided into the following blocks:

Measuring

The values voltage difference (amplitude) ΔU, slip (frequency difference) s and phase-angle  difference α, which are required for paralleling, are formed from the two measurement signals  U1 and U2 (see illustration below).  

Matching

Voltage and frequency matching functions reduce the voltage difference ΔU and slip s by  sending adjusting pulses to the voltage or turbine regulators.

Monitoring of paralleling conditions

This function compares the actual values with their set maximum values and releases  paralleling (CHK RELEASE) if all conditions are fulfilled simultaneously.

Command generation

The command generation calculates the necessary lead angle αv by which the paralleling  command must be advanced due to the delay through the closing times in order that the main  contacts close exactly at the precise instant of coincidence. If α reaches αv at the same time as  paralleling release (CHK RELEASE), the command is issued. Under synchronous conditions,  i.e. permanent paralleling release during the adjustable monitoring time tsup, the command is  also issued without taking the lead angle into consideration.

Optimum reliability

From a synchronization unit, It is expected to close the power circuit breaker at the correct time  but also that, if required, paralleling can also take place whenever permissible. Although the  series connection of the output contacts of two independently-functioning channels (dualchannel system) which is usual in synchronization systems greatly increases security against  incorrect paralleling, it necessarily leads to an reduction in availability.