Discontinuous power supply full-automatic controlling method and apparatus for motor of beam-pumping unit

A technology of intermittent power supply and motor, applied in the direction of AC motor control, control system, electrical components, etc., can solve the problem of different operation modes of intermittent power supply, and achieve the effect of solving the problem of speed out of control and solving the current impact

Inactive Publication Date: 2007-07-18
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] Although the operation mode of pumping unit interval pumping has long been known in oil production, that is, when the downhole liquid is less, it will stop, and the "interval pumping" mode of restarting the motor after the liquid gradually increases, but this operation mode is different from that of this patent. The intermittent power supply mode of operation is completely different

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  • Discontinuous power supply full-automatic controlling method and apparatus for motor of beam-pumping unit
  • Discontinuous power supply full-automatic controlling method and apparatus for motor of beam-pumping unit
  • Discontinuous power supply full-automatic controlling method and apparatus for motor of beam-pumping unit

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Embodiment Construction

[0036] Please refer to Fig. 1. Fig. 1 is an electrical main circuit diagram of the automatic control device for the intermittent power consumption of the motor of the beam pumping unit. It is controlled by the contactor when the power supply is continuous, and it is controlled by the silicon controlled rectifier when the power supply is intermittent.

[0037] Please refer to Fig. 2, Fig. 6, Fig. 7, Fig. 2 is the electrical principle diagram of automatic control device of the present invention, Fig. 6 is the electrical principle block diagram of automatic control device, Fig. 7 is the circuit principle block diagram of preferred embodiment of the present invention. The current sensors CT1, CT2, and CT3 are inductively connected to the three-phase power supply loop, and the voltage sensors T1, T2, and T3 are directly connected to the power supply loop to collect the instantaneous values ​​of the working current i and the working voltage u when the motor is continuously powered; ...

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Abstract

This invention relates to a full auto-control method and its device for controlling the discontinuous supply and continuous operation of a motor of a beam running pumping unit. A data collection unit tests the voltage and current of the motor, a master control unit determines the cut-off times in one work period and the electric parameter at the cut-off time when supplying electricity continuously, the operation parameter of the motor is monitored to see if it has changed greatly to determine if it has returned to the continuous supply state or the discontinuous protection state at the discontinuous protection state. The speed of the motor is monitored, the cut-off time and times are regulated to keep them at the normal sphere, the supply is switch on when the speed of the motor approaches to synchronous speed and the conduction angle of the thyristor is controlled to avoid impact of the current.

Description

technical field [0001] The invention relates to the field of petroleum exploitation machinery, in particular to an automatic control method and device for a motor of a beam pumping unit. Background technique [0002] In a working cycle of the beam pumping unit motor in the existing oil exploration field, there are usually two working conditions of the motor and the generator: in the generator working condition, there are still four kinds of electrical losses in the motor: stator copper loss , rotor copper loss, iron loss, additional loss. Among them, the iron loss and the no-load additional loss related to the iron loss are usually larger than the corresponding loss of the motor operating condition. The electric energy generated in the working condition of the generator produces losses in the primary and secondary windings of the transformer and the feeder line, and the remaining part appears as pulsating power output to the power system. This pulsating power belongs to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P25/00H02P25/18
Inventor 罗应立崔学深
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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