KGLF-3G-6RA80 full digital synchronous motor excitation device main performance description
,系武汉科技大学专门为出口项目且电源频率为60/50Hz研制的全数字高性能励磁产品。 KGLF-3G-6RA80 all-digital synchronous motor excitation device is a full-digital high-performance excitation product specially developed by Wuhan University of Science and Technology for export projects and the power frequency is 60 / 50Hz. This device adopts microcomputer control technology. The system is composed of Siemens full digital rectifier unit + demagnetization unit + programmable controller + man-machine interface, etc. It has perfect excitation control, system protection, fault alarm and display functions.
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, water 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 AC380 ～ 460V (or three-phase three-wire system AC380 ～ 460V)||Rated voltage of control power: AC110V ～ 220V|
|AC input rated frequency: 60 / 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 1.4 times strong excitation multiple requirements)|
|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 is composed of Siemens all-digital rectifier power unit + demagnetization unit + programmable controller + industrial touch screen, etc. It has perfect excitation control, system protection, fault alarm and display functions.
This product can choose three control modes: single frequency operation, frequency conversion operation or frequency conversion / power frequency operation.
When the "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-adjusted operation. When the inverter sends a "frequency conversion switching power frequency" passive dry contact signal to the excitation device, the excitation system can automatically switch from frequency conversion control to power frequency control without stopping the machine 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.
System rectifier power unit selects Siemens 6RA80 series all digital rectifier. According to the rated parameters of the motor, 6RA8081-6DS22 (DC400A / 485V) or 6RA8085-6DS22 (DC600A / 485V) full digital rectifiers can be selected to ensure sufficient output power and current and voltage margin of the excitation system.
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 functions. 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.
system control unit uses Siemens S7-200PLC series products. The PLC has a good self-diagnostic function, can perform operating parameters and fault management, can modify and display various parameters of the current operation online, and can cyclically store more than 200 fault signals and time.
Human-machine interface selects the international famous brand Schneider 7-inch color touch screen for operation setting on the touch screen, which can conveniently select the control methods such as "constant angle", "constant excitation current", "constant power factor", etc. The display is switched in English, which is convenient and intuitive. It can modify and display various parameters, data and waveform curves of the current operation, and can record the operation parameter report and more than 200 fault information in real time.
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-fusing, under-excitation, over-excitation, thyristor over-temperature, rectifier transformer over-temperature, asynchronous start time-out, out-of-step, etc. 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 vision glass door and the upper and lower double instrument inner door, and the back door is a double-open door. When the cabinet and internal components are not deformed.