Description
ISH070/60017/0/1/00/0/00/01/00 Schneider servo motor
ISH070/60017/0/1/00/0/00/01/00 Schneider servo motor
Module Clips Drive controller servo moto
ISH070/60017/0/1/00/0/00/01/00A motor is a device that converts electrical energy into mechanical energy. ISH070/60017/0/1/00/0/00/01/00 It utilizes an energized coil (i.e. stator winding) to generate a rotating
magnetic field and act on the rotor (such as a squirrel cage closed aluminum frame) to form a magneto electric rotational torque. Electric motors are divided into DC
motors and AC motors according to the different power sources used. Most of the motors in the power system are AC motors, ISH070/60017/0/1/00/0/00/01/00 which can be synchronous motors or
asynchronous motors (the stator magnetic field speed of the motor does not maintain synchronous speed with the rotor rotation speed). An electric motor is mainly
composed of a stator and a rotor, ISH070/60017/0/1/00/0/00/01/00 and the direction of the force acting on the energized wire in the magnetic field is related to the direction of the current and the direction
of the magnetic induction line (magnetic field direction). ISH070/60017/0/1/00/0/00/01/00 The working principle of an electric motor is that the magnetic field exerts a force on the current, causing the motor to rotate.
Contact: Mr. Lai
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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.
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