Description
hardware flow control. It is an ideal choice in the field of industrial automation.
3.2 Upgrading of regulators and control systems
For the upgrade of the regulator, the original excitation control system cabinet structure is retained, and the entire system is upgraded by upgrading the board card.
Among them, the CoB main board, MUB measurement board, F10 input and output board, and LCP local control panel were replaced with the PEC800 controller,
CCM measurement control interface board, CIo comprehensive input and output board, and ECT excitation system control terminal in the Unitrol6800 system respectively.
For the upgrade of the power cabinet, since the power of the excitation system will not change during the transformation, the N-1 redundant configuration of the five
UNL3300 rectifier bridges in the original system has not been changed, but the control and measurement parts of the rectifier
bridge have been upgraded. And the fan circuit and power control part of the rectifier bridge have been upgraded. Among them, the signal interface board (PsI) was
changed to the rectifier bridge signal interface board (CsI), the circuit breaker of the rectifier bridge panel was changed from CDP to CCP, and the rectifier bridge control
interface board (CIN) was changed to the rectifier bridge control board (CCI).
For the upgrade of the demagnetization cabinet, the switch control part was mainly upgraded. By adding a CIo board to the switch cabinet and installing a special
power distributor and relay to control the demagnetization switch, the original PsI board was removed. Secondly, in the transformation of the current detection part,
the Hall element in the Unitrol5000 system was replaced by the current relay of the Unitrol6800 system.
For the upgrade of the excitation current measurement part, the rectifier side Hall element of the rectifier bridge was replaced with an AC side CT. Relying on the linearity of the
CT, the current sharing coefficient of the excitation system was increased to 0.98, so that the role of the rectifier bridge can be fully exerted in the system. .
For the upgrade of the fan power supply circuit of the rectifier cabinet, each power cabinet can independently control the power supply of the fans in the
cabinet to avoid the problem that if the power circuit relay fails in the original system, all the fans will not work.
3.3Unitrol6800 functional logic configuration points
The Unitrol6800 system adds PT slow-blow judgment logic, and defines the actions of PT slow-blow as alarm and channel switching. The system PT
slow-blow logic pressure difference is 2% to ensure sufficient sensitivity. Since some external reasons will cause the sequential increase or decrease of magnetic
commands, a special increase or decrease magnetic contact adhesion judgment logic has been added to effectively lock out external causes. At the same
time, it can
avoid the jitter of the relay on the increase or decrease magnetic circuit and ensure the stability of the circuit. The excitation temperature detection is used to
alarm in the system, but it cannot control the system tripping. The tripping intermediate relays K291 and K292 use high-power (≥5w) relays to avoid
the problem of tripping of the excitation system
due to signal interference.
4 Problems discovered during the transformation and their solutions
After upgrading the excitation system from Unitrol5000 to Unitrol6800, since the partition between the regulator cabinets of the original excitation switch
cabinet was removed and the mounting backplate of the regulator was moved forward, the hot air from the excitation switch cabinet will enter the excitation regulator
cabinet, causing the cabinet to be damaged. The internal temperature rises, and sometimes the temperature can even reach 45°C. In order to avoid problems caused
by high temperatures, partitions were added to reduce the temperature inside the switch cabinet and control the
temperature to 30°C.
During the maintenance process, if the grounding carbon brush of the generator is removed, it is easy to cause the rotor grounding relay isoLR275 to
malfunction. Therefore, during maintenance, the power supply of the grounding relay will be disconnected and the large shaft in the magnetic cabinet will be short-circuited.
5 Conclusion
Through the transformation of the excitation system, our company not only meets the needs of increasing the generator capacity, but also
eliminates the safety hazards of ARCnet failure or flat cable damage in the excitation system of the unit. It can find the fault point during maintenance
and prevent the unit from non-stop. event. The new board used in the new excitation system has modular characteristics, which can make online maintenance more
convenient, and because the boards use trigger pulse generation communication and optical fiber redundant communication, the stability of
information transmission is ensured. Avoid communication failures and damage to pulse lines.
Display operation panel TPU3-EX 3HNA010905-001
Display operation panel TPSTU02
Display operation panel TPS02
Display operation panel TPPB-02 3HNA02320000101
Display operation panel TPPB-02 3HNA023200-001/01
Display operation panel TPM810
Display operation panel TPM01
Display operation panel TP910F
Display operation panel TP867 3BSE043664R1
Display operation panel TP867
Display operation panel TP867
Display operation panel TP858 3BSE018138R1
Display operation panel TP858
Display operation panel TP857 3BSE030192R1
Display operation panel TP857
Display operation panel TP854 3BSE025349R1
Display operation panel TP854 3BSE025349R1
Display operation panel TP854
Display operation panel TP854
Display operation panel TP854
Display operation panel TP853
Display operation panel TP853
Display operation panel TP852 3BSC950263R1
Display operation panel TP851
Display operation panel TP830
Display operation panel TP830
Display operation panel TMM-700
Display operation panel TK891F
Display operation panel TK891F
Display operation panel TK890F
Display operation panel TK890F
Display operation panel TK854V030
Display operation panel TK853V020
Display operation panel TK851V010/3BSC950262R1
Display operation panel TK850V007
Display operation panel TK831F
Display operation panel TK831F
Display operation panel TK821F
Display operation panel TK821F
Display operation panel TK817F
Display operation panel TK817F
Display operation panel TK812V150
Display operation panel TK812V050
Display operation panel TK812V050
Display operation panel TK812V015
Display operation panel TK812V015
Display operation panel TK811V150
Display operation panel TK811V150
Display operation panel TK811V050
Display operation panel TK811V050
Display operation panel TK811V015
Display operation panel TK811V015
Display operation panel TK811F
Display operation panel TK811F
Display operation panel TK809F
Display operation panel TK809F
Display operation panel TK808F
Display operation panel TK807F
Display operation panel TK807F
Display operation panel TK803V018 3BSC950130R1
Display operation panel TK802F
Display operation panel TK802F
Display operation panel TK801V012
Display operation panel TK801V012
Display operation panel TK801V006
Display operation panel TK801V006
Display operation panel TK801V003/3BSC950089R1
Display operation panel TK801V003
Display operation panel TK801V003
Display operation panel TK701F
Display operation panel TK527V030
Display operation panel TK516 3BSE000388R1
Display operation panel TK516
Display operation panel TK212A
Display operation panel TK212A
Display operation panel TK212
Display operation panel TK212
Display operation panel TD951F
Display operation panel TC630
Display operation panel TC625
Display operation panel TC562
Display operation panel TC560V2 3BSE022178R1
Display operation panel TC520 3BSE001449R1
Display operation panel TC514
Display operation panel TC512V1 3BSE018059R1
Display operation panel TC512V1
Display operation panel TC512
Display operation panel TC405K03
Display operation panel TBU810
Display operation panel TB870F
Display operation panel TB870F
Display operation panel TB852
Display operation panel TB852
Display operation panel TB850 3BSC950193R1
Display operation panel TB850
Display operation panel TB850
Display operation panel TB845
Display operation panel TB842
Display operation panel TB840A 3BSE037760R1
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