ATC detects the temperature of each point of the unit through the ATCI/O channel of DEH control cabinet, calculates the actual stress of the high and medium pressure rotor, and then compares it with the allowable stress to get the difference. Then it is transformed into the target instruction and change rate of speed or load, and DEH is used to control the speed increase and load change of the unit.
In the whole process of unit start-up or load change, closed-loop automatic control is carried out to keep the rotor stress within the allowable range. In addition to stress closed-loop control, ATC also has perfect logic control and locking loop for turning, warming-up, valve switching and grid connection, which can automatically monitor various safety parameters such as turbine eccentricity, differential expansion, metal temperature of vibration bearing, axial displacement, motor cooling system and so on.
Extended data
ATC system includes four subsystems: automatic train protection (ATP), automatic train operation (ATO), automatic train monitoring (ATS) or centralized dispatching (CTC) and computer interlocking system.
1, ATS function: It is the core function of ATC, which can automatically or manually control the route, conduct traffic dispatching and command, and provide information to traffic controllers and external systems. ATS function is mainly realized by equipment located in OCC (Control Center).
2. Interlocking function: respond to the command of ATS function, manage the control of route, turnout and signal at any time under the premise of meeting the safety criteria, and provide route, track circuit, turnout and signal and status information to ATS and ATC functions. The interlocking function is realized by the equipment distributed beside the track.
3. Train detection function: generally completed by track circuit.
4.ATP function: under the constraint of interlocking function, the train operation is controlled according to the requirements of ATS.
5.PTI function: send and receive all kinds of data through various channels, transmit them to ATS at specific locations, and report train identification information, destination number, crew number and train position data to ATS to optimize train operation.
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