1 Introduction
In the process of promoting social progress and economic development, the railway has always been in an important position. Since the railway operation, an important part of China's railway system has been mainly embodied in the switchgear conversion equipment, so the reliability of the railway turnout motor is higher. Requirements, and then control and protection of the switch motor is particularly important.
At the same time, with the continuous increase of railway transportation volume in China, the speed of trains passing through the ramps has gradually increased. In addition, the heavy-duty trains and the heavy-duty steel rails have been opened, which has caused significant changes in the working conditions of the switchgear conversion equipment. The power gradually develops to high power, so any failure of the switch motor will affect the normal order of the railway operation, causing serious losses to life and property [1], in order to avoid accidents as much as possible, the railway switch motor With intelligent motor controller control, using advanced computer network technology and communication technology, it can complete various control, monitoring and recording functions required for switching motors. The input protection and control functions can be assigned to output relays through programming. On the controller panel, the LED indicator, the liquid crystal display or the keyboard can be used to obtain various data such as current, heat and running time of the railway switch motor, and the motor can be controlled to start, stop, reset, and Set parameters, etc., connect RS485 communication terminal of controller, remote operation personnel Through the man-machine interface, the data stored in the protection device can be read, the different functions of each output relay, the setting and modification of the data, the event recording and the fault waveform display can be realized. The function of the Ankerui ARD3 controller is mainly It is specifically introduced in a typical engineering application of a railway.
2, railway to motor controller function requirements
Railway system switching motor is an important electrical equipment in railway operation. It plays a vital role in improving railway transportation efficiency and ensuring the safe operation of trains. Therefore, its reliability, stability and function are extremely high. The specific functional requirements of the railway system switch motor for the ARD3 controller are:
(1) Control function: realize the control and protection of the phenomenon of overload, phase failure, unbalance, residual current, stall, blockage, underload, undervoltage, start timeout, phase sequence and temperature of the railway turning motor;
(2) Fault judgment and recording function: When ARD3 detects the external fault input signal, the external fault switch quantity is closed, and the protector trips within the trip set time, that is, according to the set requirements, to ensure the safe operation of the switch motor equipment. ;
(3) Display function: real-time display of three-phase current, voltage, active power, apparent power, power factor and other parameters during the operation of the railway switch motor through the display module;
(4) Communication function: It has standard RS-485 communication interface, adopts Modbus-RTU and Profibus-DP communication protocol.
The control room operator communicates with the controller and completes the reading and setting of various parameters of the railway switch motor controller on the background man-machine interface. At the same time, the motor operation fault is monitored online, in order to ensure the safe production of the process system and reduce accident parking. Reliable basis.
3. Overview of intelligent motor controller
Ankerui ARD3 intelligent motor controller, suitable for motors with rated voltage up to AC690V, rated current to AC800A, rated frequency 50/60Hz, small size, compact structure, easy installation, low voltage control terminal cabinet and 1/4 mode Several drawers can be directly installed and used in several drawers, which improves the reliability and automation level of the control loop.
ARD3 adopts modular product structure, including main control module, transformer module and remote display module. It can also be equipped with other functional modules or accessories of ARD3 according to requirements, and motor control protection with electrical components such as contactors and motor starters. Unit, remote automatic control, on-site direct control, panel indication, signal alarm, fieldbus communication, etc., with overload, stall, block, underload, phase failure, unbalance, residual current (ground/leakage), temperature Comprehensive fault protection functions such as external fault, phase sequence, overvoltage, undervoltage, underpower, tE time, etc. [2], to meet the needs of the railway system for the motor controller.
Figure 1250A, 800A ARD3 product composition block diagram
The main control module: completes the functions of measurement, protection and control, and completes the entire measurement and protection function by adding functions such as temperature, voltage, residual current, and analog output;
Transformer module: When the rated current of the motor is 100A or less, the protector is equipped with a small dedicated current transformer detection module. The small dedicated current transformer detection module can detect the overload current within 10 times and detect the input current signal. The secondary side signal is connected to the main body control module; when the rated current of the motor is greater than 250A, an external current transformer is used;
Display module: Real-time display of the current running condition of the railway switch and the three-phase current, voltage, power, electric motor and other parameters through the display module, realizing the real-time monitoring function; once the motor fails, the protection device delays Control the main contactor coil to lose power and control the motor to stop accurately.
4, engineering application typical case
The motor controller is an important component of the railway operating system. The extensive use of the motor controller not only improves the accuracy and scientificity of the process control, but also reduces the accident rate. It also plays an important role in improving the automation level of the railway electrical control system and developing the national economy. Actively promote the role, the following Ankerui ARD3 intelligent motor controller in a railway operating system and switch motor control loop application as an example for specific analysis and introduction.
Figure 2 is a typical electrical schematic diagram of the ARD3 controller in a railway system retrofit project. In the figure, the changeover switch SA2 realizes the local/remote control of the railway system, realized by the 14 and 15 digital input terminals of ARD3, 19 of ARD3. 20 terminal control buttons 1SB, 1SBS, to achieve local start and stop control of the railway system, panel control loop to achieve remote start and stop control, when the motor is in normal state, KM coil and ARD3 7 and 8 in series, close the circuit breaker QM The 7th and 8th start output terminals of the controller are closed, the motor starts running, and the ARD3's 95, 96 and 97, 98 realize the motor fault indication and control. When the motor fails, the 95 and 96 terminals are disconnected, and the KM coil is de-energized. The motor stops, and the 97 and 98 terminals are closed, the fault indicator light is on, and the ARD3 terminals 17 and 22 realize the state control of the circuit breaker and the contactor. The whole system controls the motor and alarms the fault to ensure the normal operation of the railway system. .
Figure 2 ARD3 application in a railway system
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