Submersible motor non-sensor temperature on-line monitoring device based on DC injection concept and monitoring method thereof

A technology of submersible motor and direct current injection, which is applied in the direction of thermometers, measuring devices, and electric devices using electric/magnetic components that are directly sensitive to heat

Inactive Publication Date: 2011-05-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to further solve the problem of real-time monitoring of the temperature of the submersible motor in the 2km-3km oil well on the basis of the existing sensorless temperature monitoring device for th

Method used

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  • Submersible motor non-sensor temperature on-line monitoring device based on DC injection concept and monitoring method thereof
  • Submersible motor non-sensor temperature on-line monitoring device based on DC injection concept and monitoring method thereof
  • Submersible motor non-sensor temperature on-line monitoring device based on DC injection concept and monitoring method thereof

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specific Embodiment approach 1

[0015] Specific implementation mode one: combine figure 1 Describe this embodiment, this embodiment is the submersible motor sensorless temperature on-line monitoring device based on DC injection idea, it includes sampling resistance R ext , field effect transistor MOSFET, field effect transistor driver 1, sampling resistance voltage transformer PT1, submersible motor stator phase current transformer CT, signal conditioning circuit 2 and control circuit 3; There is a sampling resistor R in series ext , and the sampling resistor R ext A sampling resistance voltage transformer PT1 and a field effect transistor MOSFET are connected in parallel at both ends of the two ends, and a current transformer CT is also arranged on one phase in the connection between the three-phase power supply and the motor, and the current signal output terminal of the current transformer CT and the sampling The voltage signal output terminal of the resistance voltage transformer PT1 is respectively co...

specific Embodiment approach 2

[0018] Specific implementation mode two: combination figure 1 Describe this embodiment. The difference between this embodiment and the specific embodiment is that it also includes a motor input voltage transformer PT2 for measuring the line voltage input by the motor. The motor input voltage transformer PT2 is connected in series between the three-phase power supply and the motor. Motor input for one phase in the wiring. Other compositions and connection methods are the same as those in Embodiment 1.

specific Embodiment approach 3

[0019] Specific implementation mode three: combination figure 1 This embodiment is described. The difference between this embodiment and the first or second embodiment is that it also includes a liquid crystal display circuit 5 , and the data signal output end of the control circuit 3 is connected to the data signal input end of the liquid crystal display circuit 5 . Other compositions and connection modes are the same as those in Embodiment 1 or 2. It is used to display the stator current waveform diagram monitored in the DC injection mode of the submersible motor, and express it in a more intuitive form.

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Abstract

The invention discloses a submersible motor non-sensor temperature on-line monitoring device based on a DC injection concept and a monitoring method thereof, and relates to the technology of non-sensor thermometry. The invention aims to further solve the problem of real-time temperature monitoring of a submersible motor in a 2km-3km oilwell on the basis of a conventional submersible motor non-sensor temperature monitoring device. A sampling resistor is connected in series with a wire connecting a three-phase power source and a motor at one phase, the sampling resistor is connected in parallel with a sampling resistor voltage transformer and a field-effect transistor, and an current transformer is arranged at the phase of the wire connecting the three-phase power source and the motor; a control circuit controls the switch of the field-effect transistor through a field-effect transistor driver, values of stator phase current and sampling resistor voltage are collected instantaneously through the current transformer and the sampling resistor voltage transformer and transmitted back to the control circuit through a signal conditioning circuit, and the control circuit calculates direct component Ias.dc and Vsw.dc; and the motor stator temperature which is the monitoring temperature obtained eventually is calculated. The invention belongs to the non-sensor monitoring technology applied to submersible motor real-time temperature monitoring.

Description

technical field [0001] The invention relates to a sensorless temperature measurement technology of a submersible motor working in an underground 2km-3km oil well. Background technique [0002] The sensorless temperature monitoring device for submersible motors can meet the needs of major oilfields in the late stage of exploitation. Due to the negative effects of high temperature and high pressure brought about by deep oil recovery on the working state of submersible motors, it can overcome the high cost or performance of existing submersible motor temperature measurement devices. Due to the limited shortage, real-time monitoring of the temperature of the submersible motor in the 2km-3km underground oil well ensures that the submersible electric pump unit operates under good working conditions, significantly reduces the pump inspection cycle of the oil well, and greatly improves the working efficiency of the oil field. to significant economic benefits. [0003] In order to o...

Claims

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Application Information

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IPC IPC(8): G01K7/22
Inventor 王立国徐殿国夏禹郝宏海张凤娜任翔李临春吕琳琳
Owner HARBIN INST OF TECH
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