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
LAM Research 810-034817-003 interface Board
LAM Research 810-034806-105 HALO/VCI INTRF-6 PCB Assy
LAM Research 810-034803-002 Assy PCB DIP BreakoutAPMU
LAM Research 810-031183-001 Dual Gas feed W/Toxic Motherboard
LAM Research 810-017388-003 VME Ethernet Address PCB
LAM Research 810-017082-004 16 chanel Heater Control PCB
LAM Research 810-017031-004 ADIO Board
LAM Research 810-017003-004 High Frequency PCB Board
LAM Research 810-015987-101 TCP AUTOTUNE PCB BOARD
LAM Research 810-014025-004 VCI/BICEP II SCALING
LAM Research 810-002895-102 Lonworks Valve Control Node PCB
LAM Research 810-001489-016 Rocker Valve Interface Board
LAM Research 810-000839-003 ESC CURRENT MONITOR
LAM Research 685-151520-102 COMPUTER Ethernet
LAM Research 685-151512-102 Computer EC2 QNX4 Module
LAM Research 685-058616-001 7001A200-2 BDS Receiver
LAM Research 660-900984-009 1513 RF Generator
LAM Research 660-900984-008 RF Generator
LAM Research 660-200788-001 3Kw RF Generator
LAM Research 660-072825-200 MKS LVF3527A-10B-05 27Mhz RF GENERATOR
LAM Research 660-063437-003 AE APEX 2013 M/N 3156113-024 RF Generator
LAM Research 660-063435-003 AE Apex 1513 M/N 3156110-003 RF Generator
LAM Research 660-032596-014 AE APEX 1513 MN 3156110-014 RF Generator
LAM Research 63-431842-00 Controller
LAM Research 63-431069-00 controller
LAM Research 61-420450-00 Controller
LAM Research 605-707109-012 VME-LTNI-S5 Network Interface Module
LAM Research 605-707109-002 VME-LTNI-S4 SEMICONDUCTOR BOARD
LAM Research 605-109114-004 V7668A-132L00W04 Single Board Computer
LAM Research 605-109114-003 V7668A Board
LAM Research 605-109114-002 Single Board Computer
LAM Research 605-109114-001 V7668A-131000 4-Port Gigabit Ethernet Card Module
LAM Research 605-099141-004 MVME 2604 712 I/O Board
LAM Research 605-097209-003 Watlow HAL Board
LAM Research 605-064676-007 V7668A-132L00W01 SBC Board
LAM Research 605-064676-006 V7668A-132L00 4-Port Gigabit Ethernet Board
Lam Research 605-064676-005 GE FANUC EMBEDDED SYSTEMS VME 7671
LAM Research 605-064676-003 GE VME 7671 SBC Board
RELIANCE O-57442 Data Highway Plus Interface module
RELIANCE O-57441 Automate Modbus Plus I/O Module
RELIANCE O-57440 Ethernet Network Interface module
RELIANCE O-57435 AutoMax 7010 processor module
RELIANCE O-57431 AutoMax processor modules
Reviews
There are no reviews yet.