KGLF-3S Full Digital Synchronous Motor Excitation Device Main Performance Description
,系武汉科技大学开发研制的全数字高性能励磁产品。 KGLF-3S full digital synchronous motor excitation device is a full digital high performance excitation product developed by Wuhan University of Science and Technology. This device adopts microcomputer control technology. The system consists of thyristor power unit + demagnetization unit + programmable controller + human-machine interface + digital excitation regulator and other parts. .
This device can be widely applied to the excitation system of power frequency or variable frequency operation of brush synchronous motors with load types such as ball mills, fans, pumps, compressors, and rolling mills.
产品型号说明 I. Product model description
Second, the main technical parameters:
|AC input rated voltage: Three-phase four-wire system AC380V AC220V||AC input rated frequency: 50Hz (¡À 10%)|
|Rated excitation output voltage: meets 1.15 times the rated voltage of the rotor for long-term operation||Rated excitation output current: 1.1 times the rated current of the rotor for long-term operation|
|Maximum strong excitation output voltage: meet the requirements of 1.4 times the strong excitation multiple||Maximum strong excitation output current: meet the 1.4 times strong excitation multiple requirement, allowable time ≤60s|
|Excitation voltage adjustment range: 20% ～ 125%||Excitation cabinet size: 2260 * 800 * 800mm (height * width * depth)|
|Rectifier transformer / demagnetizing resistance cabinet size: 2260 * 900 * 800mm (height * width * depth)||Cabinet color: RAL7035 (or specified by the user)|
Altitude: 2000 ～ 5000 meters
Ambient temperature: -5 ℃ ～ 45 ℃
Relative humidity: 95% (25) ℃
Earthquake grade: 7
Installation location: indoor
Protection level: IP23
Design, manufacturing and inspection standards
GB10585-89 Basic technical requirements for the excitation system of small and medium-sized synchronous motors
GB12667-90 General technical requirements for semiconductor excitation device of synchronous motor
GB / 3797-2005 electrical control equipment
GB / T10223-2005 Basic test methods for low-voltage switchgear and electrical control equipment
V. Main performance characteristics
This product adopts microcomputer control technology. It consists of three-phase full-control bridge power unit + programmable controller + industrial touch screen + excitation regulator (dual / single) and other parts. It has perfect excitation control, system protection, fault alarm and display. Features.
This product can choose three control modes: single frequency operation, frequency conversion operation or frequency conversion / power frequency operation.
When "Frequency conversion operation" mode is selected, the system can meet the requirements for the excitation control and interface of the inverter starting motor and speed control operation. When receiving the inverter's "frequency conversion switching power frequency" passive dry contact signal from the inverter, the excitation system can automatically switch from frequency conversion control to power frequency control without stopping to meet the control requirements for operation under power frequency conditions;
When the "power frequency operation" mode is selected, the system can meet the requirements of independent adjustment and control of independent operation such as frequency measurement, excitation, and protection.
Thyristor power unit adopts 6 sets of KP500A air-cooled components and adopts independent modular drawer structure to form a three-phase full-control bridge rectifier circuit. The power unit is cooled by forced air cooling and adopts double-layer fan drawers. The fan drawer is equipped with 3 high-quality axial flow fans, which can be plugged under power. The power unit has large power margin, strong resistance to voltage and current overload, strong general interchangeability, and convenient disassembly and assembly.
demagnetization unit consists of 2 sets of KP500A thyristor air-cooled components + 1 set of ZP500A rectifier tube air-cooled components + demagnetizing resistors to form an electronic non-contact demagnetizing switch circuit. The demagnetization control adopts a safe and reliable two-way or gate demagnetization method, that is, PLC low-voltage demagnetization and high-voltage induction demagnetization, with manual demagnetization detection and automatic demagnetization. The start-up resistance of the starting resistor is cut and removed by PLC in order to meet the inherent characteristics of synchronous motor starting.
programmable controller uses Siemens S7-200 series PLC. The system has a good self-diagnostic function. It can communicate with the touch screen in real time. It can modify and display the current running parameters online for operation parameters and fault management. After the touch screen parameter setting is completed, all parameters are stored in the PLC, and the touch screen can be plugged in and powered off while driving, which can still guarantee the normal operation of the device.
Human-machine interface selects Schneider 7-inch color touch screen for operation setting on the touch screen. It can easily select the control modes such as "constant angle", "constant excitation current", "constant power factor", etc. All operations are displayed in Chinese, which is convenient and intuitive. ; Can modify and display various parameters, data and waveform curves of the current operation online, and can record the operation parameter report and more than 200 fault information in real time.
Two sets of completely independent excitation regulators are used to form a dual-channel redundant system, and the two sets of excitation regulators are hot standby for each other. The system can manually switch the working channel or the standby channel during operation; the excitation regulator can also be replaced while the system is running; when the system is running, such as under-magnetization, over-magnetization, or out-of-step failures, the working channel can be automatically switched to the standby channel for seamless operation. In order to reduce the probability of breakdown parking.
excitation regulator is composed of intelligent chips of ultra-large-scale integrated circuits and high-speed analog-to-digital converters. It has no phase sequence requirements for input power, wide operating voltage range, good waveform symmetry, high control accuracy, high trigger power, and anti-interference. Powerful, stable and reliable work, and other significant features; and the use of PLC chassis structure, 35mm standard rail mounting, Phoenix pluggable terminal blocks, reliable contact, easy disassembly and assembly.
has two forward polarity methods: slip rate detection and timed excitation to ensure the success of each time. The whole process of encouraging can be monitored and displayed in real time by touch screen.
has the functions of strong excitation for no-load motor start and full-load full-load excitation to ensure that the motor can be smoothly synchronized when the no-load motor starts and under load; at the same time, the system also has a low-voltage strong excitation function when the grid voltage drops to the rated When the value is 80%, the system can automatically force the excitation to ensure that the motor will not lose step when the grid voltage is transiently low. The multiples and time of starting strong excitation and low voltage strong excitation can be set on the touch screen according to the needs of the load.
motor starting method can meet the requirements of direct or step-down starting. When the direct starting method is adopted, when the frequency measurement circuit detects that the motor reaches the sub-synchronous speed, it will automatically energize in the positive polarity; and it will ensure that the motor will not chatter when it is excited. When the step-down starting method is adopted, the frequency measurement circuit is opened when the motor starts through the soft start cabinet. When the full voltage is applied to the soft start cabinet, the full voltage signal is sent to the excitation system. When the frequency measurement circuit detects that the motor reaches the When both speeds are synchronized and the full-compression signal is closed, both forward and reverse polarities are automatically excited to ensure the safety of the soft starter cabinet.
Comprehensive and comprehensive fault alarm and fault tripping of incoming power supply phase failure, PT disconnection, fast-acting fusing, under-excitation, over-excitation, thyristor over-temperature, rectifier transformer over-temperature, asynchronous start time-out, out of step Protective function.
With high-voltage power failure protection function, when the motor stator current is powered off and stopped, the system can delay the excitation current output for 30 seconds to ensure that the motor rotor is energized for a long time and causes damage.
system can provide RS-485 serial communication interface to the outside. The system can provide RS-485 serial communication interface to outside. The communication protocol is one of three options: Profibus-DP, Modbus, Industrial Ethernet TCP / IP. It communicates with the upper computer monitoring system online, which can realize the remote measurement and remote adjustment function of the excitation system.
Excitation device cabinet structure The front door is a large field of view glass exterior door, the upper and lower double instrument inner doors, and the rear door is a double-opening door. The cabinet is beautiful and elegant, and all parts are interchangeable. The cabinet has sufficient strength and rigidity to ensure lifting. When the cabinet and internal components are not deformed.