Method for controlling three-phased asynchronous electric motor of down-pump and system for controlling electric motor of down-pump

FIELD: electric engineering, possible use for controlling three-phased asynchronous electric motors of down-pumps, used mainly for oil extraction.

SUBSTANCE: in the method for controlling the three-phased asynchronous electric motor of down- pump and in the system for controlling electric motor of down-pump in case of failure of frequency regulator or jamming of electric motor rotor, by means of mode switch, mode of direct launch from electric network is set. In that mode transfer of electric energy to electric motor occurs via chain: three-phased electric network - increasing voltage transformer - three-phased asynchronous electric motor. The control system contains a frequency control circuit and direct launch circuit, first key, connected to frequency controller and controlling feeding of power to it; input and output filters, second key, by means of which control modes are switched, third key, controlled by controller, and transformer which increased power voltage of electric motor.

EFFECT: increased efficiency.

2 cl, 4 dwg

 

The invention relates to the control of three-phase asynchronous motors, submersible pumps, used mainly for oil production.

Widely used method of controlling three-phase asynchronous motors of submersible pumps, which consists in the control of three phase induction motor using a frequency regulator and to adjust the frequency of rotation of the rotor of the electric motor.

Describes how the control is implemented in the control station three-phase asynchronous motor series "electon-05" (see figure 1, 2 manufacturer JSC "election", Raduzhny, Vladimir region, CTCD 065 ES)containing the frequency controller and the control system. Frequency control allows you to adjust the rotational speed of the rotor of the electric motor. The control system allows you to set the operating modes and to control the operation of the frequency controller.

The closest analogue shown in figure 2, contains the input terminals of the water management system for the connection of three-phase electrical network, an automatic switch For controlling power to a frequency regulator of the Czech Republic and provides short circuit protection in the circuit of the Czech Republic. Included in the scheme, the controller Contr provides control of the frequency controller of the Czech Republic, as well as the control parameters such as voltage requirements the phase of the electrical network Uc and current of the power circuit frequency regulator. The controller Contr is designed for user interaction; output terminals Wyhk designed to connect a device with a step-up transformer and forth with three-phase asynchronous motor.

The disadvantage of the described method and device for its implementation is the inability to control motor failure frequency regulator or cannot run the motor using a frequency regulator, for example, when jamming of the rotor of the electric motor.

The purpose of the proposed technical solution is the ability to control three-phase asynchronous motor with frequency regulator or directly from the mains with saving control failure frequency regulator, or inability to run the motor using a frequency regulator, while the ease of implementation of this method in the device.

This goal is achieved by the introduction of additional control mode motor - direct start-up mode, directly from the electrical network.

In the device described mode is implemented by including additional circuit direct start-up, consisting of conductors that transmit electricity passing frequency, R is gulator and the mode switch to control three-phase asynchronous motor, which is set to either the control mode using a frequency regulator, or the direct start-up mode.

The method of control of an induction motor is illustrated in figure 3. In normal operation, when the switch control modes set the mode control motor using a frequency regulator. In this mode, the transmission of electricity to the electric motor is in circuit: three-phase electric network frequency controller 1, the step-up transformer voltage 2, three-phase asynchronous motor 3. When the emergency mode, for example, failure frequency regulator 1 or jamming of the rotor of the electric motor 3, by means of the mode switch control 4 set the mode of direct start-up from the mains. In this mode, the transmission of electricity to the electric motor is bypassing the frequency regulator circuit: three-phase electric network, which increases the voltage transformer 2, three-phase asynchronous motor 3.

The device for implementing the above-described method of controlling three-phase asynchronous electric motor control electric motor submersible pumps is illustrated in Figure 4.

The device has an input terminal 5 for connection of three-phase electrical network, the key 6, control is shining applying power to the frequency regulator 1; input filter 7, which serves to reduce the influence of the frequency regulator 1 on three-phase electrical network; an output filter 8 serves to protect three-phase induction motor 3 against high voltage surges that occur during operation of the frequency controller; circuit switch - key 4 which is used for switching control of three-phase asynchronous motor; key 9 controlled by the controller 10 and is designed to turn off the motor in case of emergency; output terminals 11, for connecting the device with a step-up transformer 2, designed to improve the electric motor voltage up to 2.5 kV, and then with three-phase asynchronous motor.

The device operates as follows.

In normal mode the switch 4 is set to "Frequency regulation", when this occurs, the circuit of the key 6. In this mode, the control motor is a frequency regulator. The controller sets the operation mode of the frequency controller controls the electric parameters - voltage three-phase electric network (Uc) and through current sensors current consumption of the motor (Ia), and manages the key 9.

Failure frequency regulator or cannot run the electric motor is El through the frequency control of the key 4 is set to "Direct start", when this occurs, the opening of the key 6 and the stop of the power supply frequency regulator. In this mode, the controller controls the electric parameters - voltage electrical network (Uc) and the current consumption of the motor (Ia), and also controls key 9.

1. The method of controlling three-phase asynchronous motor of a submersible pump, comprising a speed control of the motor in normal operation of the frequency controller, wherein when the emergency mode by the mode switch control set position "direct start", turn off the power supply frequency regulator and set the mode to direct starting of three-phase asynchronous electric motor from the electric network.

2. The control system of the motor of a submersible pump that contains the frequency controller, the key that controls the voltage supply to the frequency control of three-phase electric network, the step-up transformer supply voltage three-phase asynchronous electric motor, characterized in that the input key for switching control of three-phase asynchronous motor, which is in the normal mode of operation provides for the transmission of electricity through the circuit: three-phase electric network frequency controller that increases Transfo is motor voltage, three-phase asynchronous electric motor, and in emergency mode - in chains: three-phase electric network, the step-up transformer voltage, three-phase asynchronous motor, the controller for opening the key that controls the power to the frequency controller, and disconnect the three-phase asynchronous motor in emergency mode by key, designed to turn off the motor.



 

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