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.
https://www.xmamazon.com
https://www.xmamazon.com
https://www.plcdcs.com/
www.module-plc.com/
https://www.ymgk.com
330180-51-00 Bently Nevada 3300XL Proximitor Sensor
3500/05-01-03-00-00-00 BENTLY NEVADA System Rack
3500/20 125744-02 BENTLY NEVADA Rack Interface Module
126632-01 Bently Nevada 3500/42M Proximitor/Seismic Monitor
125704-01 Bently Nevada I/O Module 3500/34
Bently Nevada 133819-01 RTD/TC Non-Isolated I/O Module 3500/60
Bently Nevada125720-01Spare 4-Channel Relay Output Module
Bently Nevada 3500/34 125696-01 TMR Relay Module
125680-01 Proximitor I/O Module Bently Nevada 3500/40M
125388-01 Half-height Module Bently Nevada
136294-01 BENTLY 3500/62 I/O Module
3500/91-01-01(161204-01+161216-01)bently Communication Gateway Module
149992-01 BENTLY 3500/33 calories Relay Output Module
330850-50-00 BENTLY NEVADA preprocessor
16710-20 Bently Nevada interconnection cable
330103-00-13-10-02-00 Bently Nevada 3300 XL 8mm Proximity Probe
P3403893-0351 BENTLY Vibration Transmitter
IMQRS22 Bently Nevada Quick Response Module
330704-000-050-10- 02-05 Bently Nevada proximity detector
330103-00-03-10-02-05 Bently Nevada proximity detector
330104-00-13-10-02-05 Bently Nevada 3300 XL 8 mm Proximity Sensor
330780-90-05 Bently Nevada 3300 XL front sensor
330106-05-30-05-02-05 Bently Nevada 3300 XL 8mm Reverse Mount Probe
330500-00-02 Bently Nevada piezoelectric speed sensor
330130-085-02-05 Bently Nevada 3300 XL Extension Cable
330161-02-85-05-94-01-02 Bently Nevada Single triaxial high voltage feedthrough of 3300 system
133292-01 Bently Nevada Low Voltage DC Power Module
3500/15-07-00-00 Bently Nevada 3500/15 Power Module
176449-08 Bently Nevada Rod position monitor
128229-01 Bently Nevada Seismic I/O Module
3500/15-02-02-01 Bently Nevada power module
1900-65A-01-01-01-01-01 Bently Nevada Universal Device Monitor
1900/65A-01-01-03-00-00 Bently Nevada Universal Device Monitor
21504-00-28-10-02 Bently Nevada 5mm / 8mm series proximity sensor system
990-05-50-01-00 Bently Nevada Two-Wire Vibration Transmitte
24765-01-01 Bently Nevada Shell Expansion Sensor Assembly
3300/03-01-01 Bently Nevada 3300/03 System Monitor
3300/14-02-20-00 Bently Nevada Dual Thrust Position Monitor
3300/14-02-20-00 Bently Nevada DC power supply
3500/42M 176449-02 BENTLY 3500/42M 176449-02 Preprocessor/seismic monitor
9200-06-01-10-00 speed sensor bently
106M1079-01 BENTLY Redundant power modules
3500/93-03-01-00-00 Analog module BENTLY NEVADA
3500/93-02-02-02-00 Pulse input submodule BENTLY NEVADA
3500/93-01-00-00-00 DCS spare parts BENTLY NEVADA
3500/92-04-01-00 DCS system module BENTLY NEVADA
3500/92-01-01 Communication gateway module BENTLY NEVADA
3500/63-01-00 Monitoring module BENTLY NEVADA
3500/61(163179-02) Power connection board BENTLY NEVADA
3500/61(133819-02) Temperature monitor BENTLY NEVADA
3500/53-01-00 Overspeed protection module BENTLY NEVADA
3500/50-04-00 Adapter module BENTLY NEVADA
3500/50-01-01-00-00 Programmable control module BENTLY NEVADA
3500/50-01-00-01 Digital input module l position module BENTLY NEVADA
3500/50-01-00 Speed module BENTLY NEVADA
3500/45-01-00 Expansion/axial position module BENTLY NEVADA
3500/42-01-00 Vibration module BENTLY NEVADA
Reviews
There are no reviews yet.