Electricity stealing prevention device for rod-pumped well

Abstract

The invention relates to the technical field of electrical engineering, in particular to a rod-pumped well electricity stealing prevention device which is characterized in that a direct current sequence changing module transmits the positive voltage and the negative voltage of direct current output by a rectifier module to two wire cores of a cable and randomly performs loop switching among all the wire cores of the cable; the core information corresponding to the switched positive and negative voltages is sent to the direct current inversion decryption module; and the direct current inversion decryption module is connected with the rod-pumped well through the frequency converter, and is used for connecting the wire core where the positive voltage and the negative voltage in the switched cable are located with the positive voltage direct current bus and the negative voltage direct current bus corresponding to the frequency converter according to the received wire core information. The problems that the electricity stealing phenomenon exists in the power transmission cable of an oil field rod-pumped well in the past, potential safety hazards are brought to production, meanwhile, economic losses are caused, an existing electricity stealing prevention mode is mainly found through equipment inspectors, manual cut-off is needed when the electricity stealing phenomenon occurs, delay exists, and electricity stealing cannot be fundamentally solved are solved.

Description

Technical Field

[0001] The invention relates to the technical field of electrical engineering, and in particular to an anti-theft electricity device for an oil pumping well. Background Art

[0002] In oilfield production, electric energy is an indispensable material resource. The act of using oilfield electricity to transmit electric energy without the permission and measurement of the oilfield is called the theft of oilfield electricity, or electricity theft for short. Electricity theft not only causes economic losses to the oilfield, but also brings safety hazards such as electric shock to production. The existing anti-electricity theft method is to capture the information of electricity theft on the power line, and then inform the manager to cut off the stolen resources to implement anti-electricity theft measures. It is an emergency anti-theft measure. Due to the certain time interval between discovery and arrival at the scene, and the limitations of investigation and punishment methods, it is impossible to effectively prevent the theft of electric resources immediately. After stopping the theft of electricity, repeated theft of electricity often occurs. This anti-electricity theft method belongs to management prevention means; most of the existing technical prevention methods use current limiting methods, but electricity thieves will destroy or increase simple current limiting measures. If the equipment that increases the current limiting measures is not stopped in time, the equipment will often burn. Summary of the invention

[0003] The present invention proposes an anti-electricity theft device for oil pumping wells to solve the problem of electricity theft in power transmission cables of oil field oil pumping wells in the past, which brings safety hazards to production and also causes economic losses. The existing anti-electricity theft method needs to be manually cut off when the electricity theft phenomenon is found, which has a delay and cannot fundamentally solve the problem of electricity theft, and increases the labor intensity.

[0004] According to one aspect of the present invention, there is provided an anti-theft power device for a pumping well, comprising: a rectifier module, a DC sequence conversion module and a DC inverter decryption module; The rectifier module is connected to the oil pumping well transformer, the DC sequence conversion module is connected to the rectifier module for converting the AC power output by the transformer into DC power, and is connected to the DC inverter decryption module through a cable; The DC sequence conversion module is used to transmit the positive and negative voltages of the DC power output by the rectifier module to two of the cores of the cable, and randomly switch the loop between all the cores, and at the same time, send the core information corresponding to the positive and negative voltages after switching to the DC inverter decryption module; The DC inverter decryption module is connected to the pumping well motor through a frequency converter. The DC inverter decryption module is used to connect the wire cores where the positive and negative voltages in the switched cable are located with the positive and negative voltage DC busbars corresponding to the frequency converter according to the received wire core information.

[0005] Preferably, the rectifier module is also used to boost the voltage output by the transformer to a predetermined voltage and then transmit it to the DC sequence conversion module; The frequency converter is used to convert the direct current transmitted through the cable into alternating current, and then transmit it to the motor of the pumping well after reducing the pressure to a predetermined pressure range.

[0006] Preferably, the DC sequence conversion module comprises: a first single chip microcomputer, a first control switch group and a wireless transmission module; The first single-chip microcomputer is connected to the first control switch group, the first control switch group is respectively connected to the positive and negative voltage output terminals of the transformer and to each wire core in the cable, and the first single-chip microcomputer is used to control the connection or disconnection of the line between the positive voltage output terminal and / or the negative voltage output terminal of the transformer and each wire core through the first control switch group; The first single-chip microcomputer is connected to the DC inverter decryption module via a wireless transmission module, and the first single-chip microcomputer is used to send information about the wire cores connected to the first control switch group to the DC inverter decryption module via the wireless transmission module each time a circuit is switched.

[0007] Preferably, the randomly switching loops among all the cores comprises: When switching the circuit, the positive voltage output terminal or the negative voltage output terminal of the transformer is first randomly connected to any non-energized core in the cable core. After a first predetermined time, the original connected core before switching is disconnected from the positive voltage output terminal or the negative voltage output terminal of the transformer.

[0008] Preferably, the DC inverter decryption module includes: a second single-chip microcomputer and a second control switch group; The second single-chip computer is connected to the second control switch group, and the second control switch group is respectively connected to each core in the cable and the positive and negative voltage DC busbars of the inverter; The second single-chip microcomputer is connected to the DC sequence conversion module. The second single-chip microcomputer is used to control the connection of the cores where the positive and negative voltages in the cable are located with the positive and negative voltage DC bus corresponding to the inverter through the second control switch group when it receives the core information and after a second predetermined time.

[0009] Preferably, the step of connecting the wire cores where the positive and negative voltages are located in the switched cable to the positive and negative voltage DC busbars corresponding to the frequency converter comprises: When the second single-chip microcomputer receives the core information, and after a second predetermined time, the cores where the positive and negative voltages are located in the control cable are connected to the positive and negative voltage DC bus corresponding to the inverter through the second switch group control cable, and after a third predetermined time, the original connection core before switching is disconnected from the positive voltage DC bus or the negative voltage DC bus of the inverter.

[0010] Preferably, before performing the circuit switching, it is checked whether the core to be switched is grounded or short-circuited. If so, the circuit is not switched to the core.

[0011] Preferably, it also includes a current comparison module; The current comparison module is connected to the transformer and the frequency converter respectively, and is used to count the total current output by the transformer and the total current received by the frequency converter, and calculate the difference between the two; If it is determined that the difference is greater than a predetermined percentage of the total current output by the transformer, the alarm module is controlled to sound an alarm.

[0012] Preferably, the signal transmission distance of the wireless transmission module is less than or equal to 200 meters.

[0013] Preferably, it also includes: an anti-theft box; The transformer low-voltage side and the DC sequence conversion module are located in the anti-theft box. A wireless password lock is provided at the door of the anti-theft box. An alarm device connected to the wireless password lock is provided inside the anti-theft box.

[0014] The present invention has at least the following beneficial effects: The present invention proposes an anti-electricity theft device for oil pumping wells. By setting a DC sequence-changing module, the current in the cable is randomly and alternately changed in the cable core, thereby preventing electricity thieves from fixing bypass lines in the power circuit and stealing DC electricity. This fundamentally solves the possibility of electricity being used for civilian purposes, ensures that the electricity used for production is not affected, and solves the problem of electricity theft from a technical level. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings herein are incorporated into and constitute a part of the specification. These drawings illustrate embodiments consistent with the present invention and, together with the specification, are used to explain the technical solutions of the present invention.

[0016] Figure 1 A schematic diagram showing the equipment connection of an anti-theft electricity device for a pumping well according to an embodiment of the present invention; Figure 2 A circuit diagram of an anti-theft electricity device for a pumping well according to an embodiment of the present invention is shown. Implementation

[0017] Various exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0018] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0019] The term "and / or" herein is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the term "at least one" herein represents any combination of at least two of any one or more of a plurality of. For example, including at least one of A, B, and C can represent including any one or more elements selected from the set consisting of A, B, and C.

[0020] In addition, in order to better illustrate the present invention, numerous specific details are provided in the following specific embodiments. It should be understood by those skilled in the art that the present invention can be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present invention.

[0021] Figure 1 A schematic diagram showing the equipment connection of an anti-theft electricity device for a pumping well according to an embodiment of the present invention; Figure 2 FIG. 2 shows a circuit diagram of an anti-theft device for a pumping well according to an embodiment of the present invention. Figure 1 and 2 As shown, an anti-theft electricity device for a pumping well includes: a rectifier module, a DC sequence change module and a DC inverter decryption module; the rectifier module is connected to the pumping well transformer, the DC sequence change module is connected to the rectifier module for converting the AC power output by the transformer into DC power and is connected to the DC inverter decryption module through a cable; the DC sequence change module is used to transmit the positive and negative voltages of the DC power output by the rectifier module to two of the cores of the cable, and randomly switch the loop between all the cores, and at the same time, send the core information corresponding to the positive and negative voltages after switching to the DC inverter decryption module; the DC inverter decryption module is connected to the pumping well motor through a frequency converter, and the DC inverter decryption module is used to connect the cores where the positive and negative voltages are located in the cable after switching to the positive and negative voltage DC busbars corresponding to the frequency converter according to the received core information.

[0022] In the present invention, the rectifier module is also used to boost the voltage output by the transformer to a predetermined voltage and then transmit it to the DC sequence conversion module; the frequency converter is used to convert the DC power transmitted through the cable into AC power, and then reduce the voltage to a predetermined pressure range and transmit it to the pumping well motor.

[0023] In an embodiment of the present invention, the rectifier module may be a rectifier, and the rectifier module is connected to the transformer at the original power supply of the pumping well. The 380V AC output by the transformer is boosted to a predetermined voltage by the rectifier module, and then the predetermined voltage AC is converted into DC and transmitted to the DC sequence conversion module. The predetermined voltage may be 530V.

[0024] The number of wire cores in the power supply cable is at least three, such as A, B, and C; in the initial state, the positive and negative voltage output ends of the rectifier module are randomly connected to two of the wire cores in the cable, such as A and B wire cores, through the DC sequence conversion module, and the DC sequence conversion module transmits the positive and negative voltages output by the rectifier module to the A and B wire cores respectively. In the initial state, the DC inverter decryption module transmits the 530V DC power of the A and B wire cores of the cable to the corresponding positive and negative voltage DC busbars of the inverter. After the inverter converts the 530V DC power into AC power, it is reduced to a predetermined pressure range and then transmitted to the pumping well motor for power supply, wherein the predetermined voltage range is: 0~380V.

[0025] When the DC sequence conversion module switches the loop between the cores, the loop can be switched from the original A and B cores to the A and C cores or the B and C cores. When switching to the A and C cores, the positive and negative voltage information (core information) corresponding to the A and C cores must be sent to the DC inverter decryption module at the same time, such as the A core corresponding to the positive voltage and the C core corresponding to the negative voltage.

[0026] After receiving the line core information, the DC inverter decryption module switches the A and C line cores to connect to the corresponding inverter positive and negative voltage DC busbars, thereby achieving uninterrupted power supply. When the DC sequence conversion module switches the circuit, it can switch at a certain frequency (predetermined interval time) or at irregular interval time (random interval time).

[0027] In the present invention, the DC sequence conversion module includes: a first single-chip microcomputer, a first control switch group and a wireless transmission module; the first single-chip microcomputer is connected to the first control switch group, the first control switch group is respectively connected to the positive and negative voltage output ends of the transformer and respectively connected to each core in the cable, the first single-chip microcomputer is used to control the connection or disconnection of the line between the positive voltage output end and / or the negative voltage output end of the transformer and each core through the first control switch group; the first single-chip microcomputer is connected to the DC inverter decryption module through the wireless transmission module, and the first single-chip microcomputer is used to send information about the core connected to the first control switch group to the DC inverter decryption module through the wireless transmission module each time the circuit is switched.

[0028] In the embodiments of the present invention and Figure 2In the embodiment, when there are three cable cores, the first control switch group includes four switch elements, namely X1, X2, X3 and X4.

[0029] X1, X2, X3 and X4 are respectively connected to the first single-chip computer, among which X4 is respectively connected to the positive voltage output terminal of the rectifier module and one end of the A core in the cable; X3 is respectively connected to the negative voltage output terminal of the rectifier module and one end of the C core in the cable; one end of the B core in the cable core is connected to the positive voltage output terminal of the rectifier module through X1, and is connected to the negative voltage output terminal of the rectifier module through X2.

[0030] By controlling the closing or opening of the four switch elements, the positive and negative voltages output by the rectifier module can be controlled to be transmitted to any two lines in the cable. For example, if X4 and X3 are controlled to be closed and X2 and X1 are open, the positive voltage of the rectifier module is transmitted to the A core and the negative voltage is transmitted to the C core. When the first single-chip microcomputer controls the switching loop, if the loop is to be switched to the A and B cores, the first single-chip microcomputer controls X3 to be disconnected and controls X2 to be closed. At this time, the negative voltage output end of the rectifier module is connected to the B core, and the cores A and B form a loop. If the loop is to be switched to the B and C cores, the first single-chip microcomputer controls X4 to be disconnected and controls X1 to be closed. At this time, the positive voltage output end of the rectifier module is connected to the B core, and the cores B and C form a loop. If there are more than three cores, more switch elements need to be set accordingly to achieve loop switching.

[0031] When the first single-chip computer switches the circuit, or in advance, the line core information to be switched is sent to the DC inverter decryption module through the wireless transmission module.

[0032] In the present invention, the random circuit switching between all the cores includes: when performing the circuit switching, the positive voltage output terminal or the negative voltage output terminal of the transformer is first randomly connected to any non-energized core in the cable cores, and after a first predetermined time, the original connected core before the switching is disconnected from the positive voltage output terminal or the negative voltage output terminal of the transformer.

[0033] In the embodiment of the present invention, before the current loop switching, the core connected to the rectifier module is the core of the original loop, such as X1 and X2 are in the disconnected state, X3 and X4 are in the closed state, and the original connection loop is that the core A is connected to the positive voltage output end of the rectifier module, and the core C is connected to the negative voltage output end of the rectifier module; when the loop is switched, if the loop is to be switched to the cores A and B, the first single-chip microcomputer first controls X2 to be closed, that is, the negative voltage output end of the rectifier module is connected to the unpowered core B in the cable core, and after the first predetermined time, the first single-chip microcomputer controls X3 to be disconnected, that is, the connection between the negative voltage output end of the rectifier module and the original connection (loop) core is disconnected. Among them, the first predetermined time is 10~20s.

[0034] When switching the circuit, the circuit to be switched is connected first, so that current exists in the core, and then the line of the original connecting core is disconnected with a delay, so that the DC inverter decryption module can smoothly receive the current transmitted by the positive and negative cores, and prevent instantaneous power shaking when the positive and negative voltages are switched at the same time, which affects the continuous operation of the pumping well motor.

[0035] In the present invention, the DC inverter decryption module includes: a second single-chip microcomputer and a second control switch group; the second single-chip microcomputer is connected to the second control switch group, and the second control switch group is respectively connected to each core in the cable and the positive and negative voltage DC bus of the inverter; the second single-chip microcomputer is connected to the DC sequence conversion module, and the second single-chip microcomputer is used to control the core where the positive and negative voltages in the cable are located to be connected to the positive and negative voltage DC bus corresponding to the inverter through the second control switch group when it receives the core information and after a second predetermined time.

[0036] In the embodiment of the present invention, when there are three cable cores, the second control switch group includes four switch elements, namely Y1, Y2, Y3 and Y4.

[0037] Y1, Y2, Y3 and Y4 are respectively connected to the second single-chip computer, among which Y4 is respectively connected to the positive voltage DC bus of the inverter and the other end of the A core in the cable; Y3 is respectively connected to the negative voltage DC bus of the inverter and the other end of the C core in the cable; one end of the B core in the cable core is connected to the positive voltage DC bus of the inverter through Y1, and is connected to the negative voltage DC bus of the inverter through Y2.

[0038] By controlling the closing or opening of the four switching elements, the positive and negative voltages of any two cores can be controlled to be transmitted to the inverter. For example, if Y4 and Y3 are controlled to be closed and Y2 and Y1 are controlled to be open, the positive and negative voltages will be transmitted to the inverter by the A and C cores.

[0039] When the first single-chip microcomputer controls the switching loop, the switched core information is sent to the second single-chip microcomputer through the wireless transmission module, such as the core information is the positive voltage of the A core and the negative voltage of the B core; after the first single-chip microcomputer sends the core information, the positive and negative voltage output terminals of the rectifier module are controlled to be connected to the corresponding A core and B core; after the second single-chip microcomputer receives the core information, it counts and determines that after the second predetermined time, it controls Y3 to be disconnected and controls Y2 to be closed, so that the cores A and B form a loop and complete the loop switching. Among them, the second predetermined time is: 10s. The second predetermined time is used to make the switching, when one end of the core to be switched is connected to the rectifier module first, and the other end of the core is delayed for a predetermined second time before being connected to the inverter, so that the core to be switched can be charged first within the second predetermined time, to prevent surge voltage from occurring when both ends of the core are connected at the same time, and damage the inverter, so that the inverter can smoothly receive the current in the loop after switching.

[0040] At the next switch, if the loop is to be switched to the B and C cores, the first single-chip microcomputer sends the positive voltage of the B core and the negative voltage of the C core to the second single-chip microcomputer. After the second predetermined time, the second single-chip microcomputer controls Y4 to be disconnected and controls Y1 to be closed, and the cores B and C form a loop. If there are more than three cores, more switch elements need to be set accordingly to achieve loop switching.

[0041] When the present invention is implemented, the rectifier part, that is, the rectifier module in the original pumping well inverter drive can be transplanted to the transformer end, the inverter part is retained in the original distribution box, the DC part in the middle of the inverter is lengthened, and the cable core is connected to the DC line DC bus of the inverter through a switching element. After the DC power of the cable core is transmitted to the inverter, it is converted into AC power by the inverter module inside the inverter and then transmitted to the pumping well motor, thereby realizing the means of DC input, thereby achieving the purpose of saving use cost.

[0042] In the present invention, the connecting of the wire cores where the positive and negative voltages are located in the cable after switching to the positive and negative voltage DC bus corresponding to the frequency converter includes: when the second single-chip microcomputer receives the wire core information, the connection of the wire cores where the positive and negative voltages are located in the cable is controlled by the second switch group to be connected to the positive and negative voltage DC bus corresponding to the frequency converter, and after a third predetermined time, the original connection wire core before switching is disconnected from the positive voltage DC bus or the negative voltage DC bus of the frequency converter.

[0043] In an embodiment of the present invention, before the current loop switching is performed, the core connected to the inverter is the core of the original loop, such as Y1 and Y2 are in a disconnected state, Y3 and Y4 are in a closed state, and the original connection loop is that the core A is connected to the positive voltage DC bus of the inverter, and the core C is connected to the negative voltage DC bus of the inverter; then when the loop is switched, the second single-chip microcomputer receives the core information, and after a second predetermined time, if the loop is to be switched to the cores A and B, the second single-chip microcomputer first controls Y2 to be closed, that is, the negative voltage DC bus of the inverter is connected to the unenergized core B in the cable core, and then after a third predetermined time, the second single-chip microcomputer controls Y3 to be disconnected, that is, the connection between the negative voltage DC bus of the inverter and the original connection (loop) core is disconnected.

[0044] When switching the circuit, the circuit to be switched is connected first, so that current exists in the core, and then the line of the original connecting core is disconnected with a delay, so that the inverter can smoothly receive the current transmitted by the positive and negative cores through the DC inverter decryption module, preventing instantaneous power shaking when switching positive and negative voltages at the same time, affecting the continuous operation of the pumping well motor.

[0045] Through the DC sequence conversion module and the DC inverter decryption module, the core to be switched is connected first when switching the circuit. At this time, the positive voltage output end or the negative voltage output end of the rectifier module and the positive voltage DC bus or the negative voltage DC bus of the inverter are connected to the two cores at the same time. After a delay of 10s, the core connected before switching of the two cores connected at the same time is disconnected, thereby achieving the purpose of improving current stability.

[0046] In the present invention, before the circuit switching is performed, it is checked whether the core to be switched is grounded or short-circuited. If so, the circuit is not switched to the core.

[0047] In an embodiment of the present invention, a method for checking whether a core to be switched is grounded or short-circuited includes: connecting a first single-chip computer to a resistance tester, the resistance tester is connected to each core in a cable, and before switching, the first single-chip computer detects whether the insulation resistance of the core to be switched is greater than 0.5Ω through the resistance tester, and if so, it indicates that the core is grounded; the first single-chip computer detects whether the DC resistance of the core to be switched is greater than 1Ω through the resistance tester, and if so, it indicates that the core is short-circuited. If the cores constituting the loop before switching are A and C, and the cores A and C are to be switched to A and B during switching, it is necessary to first detect whether the core B is grounded or short-circuited through the resistance tester before switching. If so, the loop cannot be switched to the core B.

[0048] At the same time, the first single chip microcomputer will start timing after each line switching. If the next circuit switching is not performed within a first predetermined time, such as more than 3 hours, the alarm unit will be controlled to alarm.

[0049] The present invention also includes a current comparison module; the current comparison module is connected to the transformer and the inverter respectively, and the current comparison module is used to count the total current output by the transformer and the total current received by the inverter, and calculate the difference between the two; if it is determined that the difference is greater than a predetermined percentage of the total current output by the transformer, the alarm module is controlled to sound an alarm.

[0050] In the embodiment of the present invention, the predetermined percentage is: 10%. Under normal power supply conditions, the difference between the current output by the inverter and the current received by the inverter should not be less than 10% of the total output current. If it exceeds 10%, it means that there may be power theft or fault in the line, and the cable line needs to be checked.

[0051] In the present invention, the signal transmission distance of the wireless transmission module is less than or equal to 200 meters.

[0052] In the embodiment of the present invention, the wireless transmission module can adopt Zigbee communication technology, which is suitable for wireless communication technology at short distances and low rates, thereby limiting the DC inverter decryption module to be used in conjunction with the DC sequence conversion module at close range. Even if the DC inverter decryption module is stolen, the cable core loop switching information cannot be obtained at a long distance. Generally, the cable length between the transformer and the inverter at the power supply is about 100 meters. The use of a wireless transmission module with a transmission distance of 200 meters can fully meet the demand, and the data transmission speed is faster and more stable.

[0053] The present invention further comprises: an anti-theft box; the low-voltage side of the transformer and the DC sequence conversion module are located in the anti-theft box, a wireless password lock is provided at the door of the anti-theft box, and an alarm device connected to the wireless password lock is provided inside the anti-theft box.

[0054] In the embodiment of the present invention, the anti-theft box seals the low-voltage side of the transformer inside, and an alarm device is installed inside the box. When the box is forcibly opened without inputting an unlocking command through the network, an alarm can be triggered.

[0055] It can be understood that the above-mentioned various method embodiments mentioned in the present invention can be combined with each other to form a combined embodiment without violating the principle logic. Due to space limitations, the present invention will not go into details.

[0056] Those skilled in the art will appreciate that, in the above method of specific implementation, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of the steps should be determined by their functions and possible internal logic.

[0057] In view of the technical deficiencies of the original anti-theft, the present invention designs a DC disordered anti-theft device, which converts the AC power that can be directly used by civilians into DC power that is inconvenient for civilian use through a rectifier. To further prevent theft of electricity, the DC sequence-changing module inside the device allows the current in the cable to change its sequence randomly, further preventing the thieves from installing bypass lines in the power circuit and using DC, fundamentally solving the possibility of electricity being used by civilians, and at the same time, ensuring that the electricity used for production is not affected, solving the problem of electricity theft from a technical level.

[0058] The invention converts AC into disordered DC, so that if the power thief cannot crack the DC phase sequence, he will not be able to use the DC, which fundamentally ensures that the oil field can be used but not for civilian use. Now the invention has been tested and applied in the actual production of the injection and production team in the operation area, and has achieved remarkable results, with wide application and promotion value.

[0059] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An anti-theft electricity device for a pumping well, characterized in that: include: Rectification module, DC sequence conversion module and DC inverter decryption module; The rectifier module is connected to the oil pumping well transformer, the DC sequence conversion module is connected to the rectifier module for converting the AC power output by the transformer into DC power, and is connected to the DC inverter decryption module through a cable; The DC sequence conversion module is used to transmit the positive and negative voltages of the DC power output by the rectifier module to two of the cores of the cable, and randomly switch the loop between all the cores, and at the same time, send the core information corresponding to the positive and negative voltages after switching to the DC inverter decryption module; The DC inverter decryption module is connected to the pumping well motor through a frequency converter. The DC inverter decryption module is used to connect the wire cores where the positive and negative voltages in the switched cable are located with the positive and negative voltage DC busbars corresponding to the frequency converter according to the received wire core information.

2. The anti-theft electricity device for oil pumping wells according to claim 1 is characterized in that: The rectifier module is also used to boost the voltage output by the transformer to a predetermined voltage and then transmit it to the DC sequence conversion module; The frequency converter is used to convert the direct current transmitted through the cable into alternating current, and then transmit it to the motor of the pumping well after reducing the pressure to a predetermined pressure range.

3. The anti-theft electricity device for oil pumping wells according to claim 1 is characterized in that: The DC sequence conversion module includes: a first single chip microcomputer, a first control switch group and a wireless transmission module; The first single-chip microcomputer is connected to the first control switch group, the first control switch group is respectively connected to the positive and negative voltage output terminals of the transformer and to each wire core in the cable, and the first single-chip microcomputer is used to control the connection or disconnection of the line between the positive voltage output terminal and / or the negative voltage output terminal of the transformer and each wire core through the first control switch group; The first single-chip microcomputer is connected to the DC inverter decryption module via a wireless transmission module, and the first single-chip microcomputer is used to send information about the wire cores connected to the first control switch group to the DC inverter decryption module via the wireless transmission module each time a circuit is switched.

4. The anti-theft electricity device for oil pumping wells according to claim 1 is characterized in that: The randomly switching loops between all the cores comprises: When switching the circuit, the positive voltage output terminal or the negative voltage output terminal of the transformer is first randomly connected to any non-energized core in the cable core. After a first predetermined time, the original connected core before switching is disconnected from the positive voltage output terminal or the negative voltage output terminal of the transformer.

5. The anti-theft electricity device for oil pumping wells according to claim 1 is characterized in that: The DC inverter decryption module includes: a second single-chip microcomputer and a second control switch group; The second single-chip computer is connected to the second control switch group, and the second control switch group is respectively connected to each core in the cable and the positive and negative voltage DC busbars of the inverter; The second single-chip microcomputer is connected to the DC sequence conversion module. The second single-chip microcomputer is used to control the connection of the cores where the positive and negative voltages in the cable are located with the positive and negative voltage DC bus corresponding to the inverter through the second control switch group when it receives the core information and after a second predetermined time.

6. The anti-theft electricity device for oil pumping wells according to claim 5 is characterized in that: The connecting of the wire cores where the positive and negative voltages are located in the switched cable to the positive and negative voltage DC bus bars corresponding to the frequency converter comprises: When the second single-chip microcomputer receives the core information, and after a second predetermined time, the cores where the positive and negative voltages are located in the control cable are connected to the positive and negative voltage DC bus corresponding to the inverter through the second switch group control cable, and after a third predetermined time, the original connection core before switching is disconnected from the positive voltage DC bus or the negative voltage DC bus of the inverter.

7. The anti-theft electricity device for oil pumping wells according to claim 1 is characterized in that: Before the circuit switching is performed, it is checked whether the core to be switched is grounded or short-circuited. If so, the circuit is not switched to the core.

8. The anti-theft electricity device for oil pumping wells according to claim 1 is characterized in that: Also included is a current comparison module; The current comparison module is connected to the transformer and the frequency converter respectively, and is used to count the total current output by the transformer and the total current received by the frequency converter, and calculate the difference between the two; If it is determined that the difference is greater than a predetermined percentage of the total current output by the transformer, the alarm module is controlled to sound an alarm.

9. The anti-theft electricity device for oil pumping wells according to claim 3 is characterized in that: The signal transmission distance of the wireless transmission module is less than or equal to 200 meters.

10. The anti-theft electricity device for a pumping well according to any one of claims 1 to 9, characterized in that: Also includes: Anti-theft box; The transformer low-voltage side and the DC sequence conversion module are located in the anti-theft box. A wireless password lock is provided at the door of the anti-theft box. An alarm device connected to the wireless password lock is provided inside the anti-theft box.

Images