Description
UFC760BE141 3BHE004573R0141 ABB Generator excitation module
Technical Requirements:
Basic working principle of self – shunt microcomputer excitation regulator
The excitation power of the generator is obtained from the generator end, and after the excitation transformer LB step-down, the SCR rectifier KZL is rectified to excite the generator. According to the voltage signal, current signal and other input signals collected by the voltage transformer TV and the current transformer TA installed at the generator outlet, the automatic excitation regulator controls and triggers the phase shift pulse of the three-phase fully controlled rectifier bridge SCR according to the preset regulation criteria, so as to adjust the excitation current of the generator and realize automatic voltage regulation when the single machine is running. The reactive power can be automatically adjusted during grid-connection to improve the stability of the power system.
After the line voltage UAC and phase current IB are transmitted by the voltage transformer and the current transformer respectively, the phase detector circuit generates the square wave pulse of the voltage period and the square wave pulse signal of the voltage current phase difference to the PIC16F877 microcontroller. The width of the two pulses is measured by the PIC counter, and the phase difference meter value can be obtained, that is, the power factor Angle of the grid. Then by looking up the table to get the corresponding power factors, further calculate the active power and reactive power.
The control unit selects A PIC16F877 microcontroller. Because the PIC16F877 microcontroller has A/D conversion function inside, it does not need external A/D module, which reduces the external components, reduces the cost and enhances the anti-interference ability. Based on the real-time data of the generator running state variables collected from the input channel, PIC microcontroller performs control calculation and logical judgment to obtain the control quantity. In the SCR rectifier circuit, the control circuit is required to output a series of pulses to the SCR control pole in accordance with the phase of the AC power supply, so as to realize the smooth switching and natural commutation of SCR. The function of the “synchronous and digital trigger control circuit” is to convert the SCR control Angle calculated by the computer CPU and represented by the digital quantity into the trigger pulse. The power amplifier circuit amplifies the trigger pulse to trigger the SCR, thus controlling the excitation current.
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Contact us:
Sales manager : Sunny
Mobile / WhatsApp : +86-18059884797
Skype : +86-18059884797
Tel: 18059884797 (WeChat with the same number)
QQ:3095989363
Email: sales@xiongbagk.cn
Address: Unit 2009, Chuangxiang Center, No.1733, Lvling Road, Siming District, Xiamen
① 24-hour email reply (12 hours);
③ For shipment to countries outside Asia, please contact the seller.
EMERSON: modbus card, PSU, controller, PSU, base, PSU, switch
EPRO — Data acquisition module, probe, speed sensor
FOXBORO – Thermal resistance I/O module, power supply module, communication module, cable, controller, switch
GE — Module, air switch, I/O module, display, CPU module, power module, converter, CPU board, Ethernet module, integrated protection device, power module, gas turbine card
Dark horse (HIMA) -DI module, processor module, AI card, pulse encoder
HONEYWELL — Secure digital output card, program module, analog input card, CPU module, FIM card
MOOG — servo valve, controller, module
NI – Information acquisition card, PXI module, card
WESTINGHOUSE: RTD thermal resistance input module, AI/AO/DI/DO module, power module, control module, base module
WOODWARD — regulator, module, controller, governor
YOKOGAWA — servo module, control cabinet node unit
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Please contact Sunny sales@xiongbagk.cn for the best price.
➱ sales manager: Sunny
➱ email mailto: sales@xiongbagk.cn
➱ Skype/WeChat: 18059884797
➱ phone/Whatsapp: + 86 18059884797
➱ QQ: 3095989363
➱ Website:www.sauldcs.com
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