The Design Of Energy-Saving Remote Monitor And Control System Terminal Of Pumping Unit

Beam pumping unit is the main oil production equipment. Due to the special working status of the pumping unit, the driving motor load rate is low. Energy utilization decreased and the power loss increased. On the other hand, as the oilfield working environment is poor, how to transmit the oil-related data to the central control room has been a difficult problem.Aiming at this situation, an energy-saving remote monitor and control system which is based on GPRS, voltage regulation with SCR and capacitor reactive power compensation is proposed. The design is based on the modular design concept, and it is made up with three main modules, namely: the monitor terminal, GPRS network communication module and control center computer system.This paper focused on the terminal design. Aiming at the peculiar situation of pumping unit, the feasibility of voltage regulation energy-saving was demonstrated from the principle of asynchronous motor. And the modules were designed and debugged. The terminal can be divided into three-phased power data acquisition module, control module, triggered SCR module.Three-phased power data acquisition module was designed firstly. The real-time three-phased voltage, current of pumping units dispersed in the oil field are transformed into weak electric signals by transformers of on-site monitoring terminals, and the electric signals are sampled and calculated by six road second-orderΣ-△ADC sampling module of three CS5463. Then the RMS value of voltage and current, active power, reactive power, power factor, and other operating parameters can be acquired.The reactive power compensation capacitor and the voltage regulated by SCR are controlled according to the reactive power and power factor. Alarm signals will be generated if the door is broken, electricity is stolen, strap is broken, system broken down, oil stolen. All these parameters and signals can be sent to the monitoring center through the communication links through mobile communications gateway which was built by MC35i module. And they were sent in the data form based on TCP/IP and UDP/IP protocol. The states of pumping units can be seen intuitively in the monitoring center. And it can be controlled remotely to start, stop, shift between energy saving state and un-energy saving state.