CN106330054A - Voltage-regulating and energy-saving dragging device for beam-pumping unit - Google Patents
Voltage-regulating and energy-saving dragging device for beam-pumping unit Download PDFInfo
- Publication number
- CN106330054A CN106330054A CN201610889002.XA CN201610889002A CN106330054A CN 106330054 A CN106330054 A CN 106330054A CN 201610889002 A CN201610889002 A CN 201610889002A CN 106330054 A CN106330054 A CN 106330054A
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- motor
- voltage
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- actuator
- saving
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor And Converter Starters (AREA)
Abstract
The invention discloses a voltage-regulating and energy-saving dragging device for beam-pumping unit and relates to the field of motor dragging. The dragging device comprises a main control unit which can detect the working current and voltage of the motor in the voltage-regulating and energy-saving dragging device in real time, the main control unit can calculate the working current and voltage of the motor to send the starting/stopping control order of the dragging device and regulating order of the working voltage of the motor, the dragging device further comprises a detection unit which can detect the working current value and voltage value of the motor in the main control voltage-regulating and energy-saving dragging device, a voltage regulating unit for regulating the sine wave with 380V-167.5V of working voltage of motor winding, and a motor for controlling the starting/stopping of dragging device. The energy-saving dragging device capable of regulating working voltage of the motor automatically according to the loading, and then regulating the output power can solve the problems of low energy efficiency and power waste of common Y-series motor and matched common control equipment used by oilfield beam-pumping unit.
Description
Technical field
The present invention relates to motor drag field, a kind of pressure regulating energy-saving for beam pumping unit drags dress
Put.
Background technology
On oil field, the oil pumper of application is mostly beam pumping unit at present, and is equipped with counterweight block.For
Can start smoothly and complete pumping operation, when matching actuator, it is necessary to match by maximum load, otherwise can not normally rise
Take out.After starting properly functioning time, due to the particularity of beam pumping unit load, cause load factor to be substantially reduced, load factor is low
To 10%～30%, produce " low load with strong power " phenomenon, and this phenomenon generally exists.Owing to load factor is low, motor is made comprehensively to imitate
Rate is low, and loss is big, and power factor is low, power factor between 0.2～0.4, line loss to be increased.The walking beam that oil field is conventional
Formula oil pumper adapted is Y280-8 motor, rated power 37KW, rated current 78.2A, and reality normally acts the electricity that works after taking out
Stream is only between 25～40A.As can be seen here, above-mentioned conventional actuator efficiency is low, and loss is big, so can waste valuable energy
Source.
Now with the actuator solving " low load with strong power " with SCR AC pressure regulation.But because of SCR AC pressure regulation
Output voltage adjust be by change the angle of flow, voltage the lowest output waveform unfilled corner is the biggest.Produce serious wave distortion, thus
It not positive wave string, the serious output reducing motor.Though detecting that voltage can be reduced to about 160V, but contrast energy-saving effect being not
Substantially, and a large amount of harmonic injection electrical network can be produced, cause serious harmonic pollution.
Summary of the invention
In view of this, the present invention provides a kind of pressure regulating energy-saving actuator for beam pumping unit, can be according to load
Size automatically adjust motor operating voltage, and then adjust the energy-saving actuator of output, to solve oil field beam type
Conventional y series motor and supporting conventional controlling apparatus efficiency that oil pumper uses are low, the problem that a large amount of electric energy are wasted.
Described a kind of pressure regulating energy-saving actuator for beam pumping unit includes:
Main control unit, detects operating current and the voltage of motor in pressure regulating energy-saving actuator in real time, calculates the work of described motor
Make electric current and voltage, be used for sending the adjustment instruction of the control instruction of actuator start-stop and motor operating voltage；
Detector unit, is connected with main control unit, the working current value of motor and magnitude of voltage in pressure regulating energy-saving actuator
Detect；
Voltage-adjusting unit, is connected with described main control unit, the operating voltage range for making motor winding be 380V～
The sine wave of 167.5V；
Motor, is connected with described voltage-adjusting unit, for controlling the start-stop of actuator.
Preferably, described a kind of pressure regulating energy-saving actuator for beam pumping unit also includes:
Man-machine interaction unit, carries out visualization display for the current value described detector unit being detected and magnitude of voltage, and
For described main control unit being controlled the input of order.
Preferably, described voltage-adjusting unit includes:
Three-phase transformer, armature winding has tap, and for changing the running voltage of motor, and the capacity of required transformator is institute
Control the 8% of power of motor；
Electromagnetic actuator, the instruction sent according to described control unit, for controlling the armature winding of described three-phase transformer
Different taps are respectively connected to three phase mains and first and last terminates into three phase mains or N line, and control motor winding and be connected into angle-type scheme
Or star-star connection, and control the connecting and disconnecting of motor simultaneously.
Preferably, described motor is y series motor.
Preferably, in the secondary winding coil of described three-phase transformer is serially connected in the winding loop of described motor.
Preferably, described three-phase transformer is that the connection method using Same Name of Ends different with different name end changes voltage-phase.
Preferably, the tap number of described three-phase transformer armature winding is 2, and 2 lead-out wires are drawn in each tap.
Preferably, described electromagnetic actuator controls the armature winding difference tap of described three-phase transformer by catalyst
It is respectively connected to three phase mains and first and last terminates into three phase mains or N line, and control motor winding and be connected into angle-type scheme or star connects
Line, and control the connecting and disconnecting of motor simultaneously.
There is advantages that
The present invention, in load factor as little as 10%～30%, will not produce " low load with strong power " phenomenon；Solve motor overall efficiency low, damage
Consumption is big, and the problem that power factor is low, meanwhile, can obtain the operating voltage range of motor winding be 380V～167.5V just
String ripple, sinusoidal wave undistorted；Ensure that motor is operated in Gao overall efficiency district, thus realize motor optimum energy-saving effect；And
Harmonic injection electrical network will not be produced, it is to avoid harmonic pollution.
Accompanying drawing explanation
By below with reference to the accompanying drawing description to the embodiment of the present invention, above-mentioned and other purpose of the present invention, feature and
Advantage is apparent, in legend:
Fig. 1 is the system schematic block diagram of the embodiment of the present invention；
Fig. 2 is the major loop electrical schematic diagram of the embodiment of the present invention.
Detailed description of the invention
Below based on example, present invention is described, but what deserves to be explained is, the present invention is not limited to these and implements
Example.In below the details of the present invention being described, detailed describe some specific detail sections.But, for the most detailed
The part described, those skilled in the art are appreciated that the present invention the most completely.
Additionally, it should be understood by one skilled in the art that provided accompanying drawing is simply for the explanation purpose of the present invention, spy
Seeking peace advantage, accompanying drawing is not actual being drawn to scale.
Meanwhile, unless the context clearly requires otherwise, otherwise " including ", " comprising " in entire disclosure and claims etc.
Similar word should be construed to the implication that comprises rather than exclusive or exhaustive implication；It is to say, be " including but not limited to "
Implication.
Fig. 1 is the system schematic block diagram of the embodiment of the present invention.As it is shown in figure 1, a kind of pressure regulation for beam pumping unit
Energy-saving actuator, including main control unit 1, detector unit 2, voltage-adjusting unit 3, motor 4, man-machine interaction unit 5 and power supply
Unit 6, power subsystem 6 is that main control unit 1, detector unit 2, voltage-adjusting unit 3, motor 4 and man-machine interaction unit 5 supply
Electricity.
In Fig. 1, main control unit 1 detects operating current and the voltage of motor in pressure regulating energy-saving actuator in real time, calculates electricity
The operating current of machine 4 and voltage, be used for sending the adjustment instruction of the control instruction of actuator start-stop and motor 4 running voltage；
Detector unit 2 is connected with main control unit 1, and in pressure regulating energy-saving actuator, working current value and the magnitude of voltage of motor 4 enters
Row detection；Voltage-adjusting unit 3 is connected with main control unit 1, the operating voltage range for making motor winding be 380V～
The sine wave of 167.5V；Motor 4 is connected with voltage-adjusting unit 3, for controlling the start-stop of actuator；Man-machine interaction unit
5 carry out visualization display for current value detector unit 2 being detected and magnitude of voltage, and for main control unit 1 is carried out
The input of control command；Voltage-adjusting unit 3 includes at the beginning of three-phase transformer 32 and electromagnetic actuator 31, three-phase transformer 32
Level winding has tap, for changing the running voltage of motor；Electromagnetic actuator 31, the finger sent according to described control unit
Order, the armature winding difference tap for controlling described three-phase transformer is respectively connected to three phase mains and first and last terminates into three-phase electricity
Source or N line, and control motor winding and be connected into angle-type scheme or star-star connection, and control the connecting and disconnecting of motor simultaneously.
Wherein, the secondary low-voltage big electric current winding of three-phase transformer 32 is serially connected in the electric power loop of motor, by controlling
The different modes of connection of armature winding, can also can boost in blood pressure lowering, it is also possible to keep output voltage identical with input voltage, and i.e. zero
Pressure drop；Need according to difference simultaneously and change the mode of connection of motor 4 three-phase windings, can be angle scheme, it is also possible to be star
Shape wiring；So that the running voltage that motor winding obtains can have 11 kinds of different voltages between 380V～167.5V, it is ensured that Y
Serial motors is operated in Gao overall efficiency district, ensures that the running voltage that motor obtains is pure sine wave simultaneously.
Further, can arrange the parameters such as protection value according to concrete operating mode by man-machine interaction unit 5, main control unit 1 is also
There is the GPF (General Protection False functions such as phase shortage, overload, three-phase imbalance；The different changes of current transformer in detector unit 2 also can be set
Ratio, can the actuator of adaptive different capacity, little to several kilowatts, big to hundreds of kilowatt；The liter of three-phase transformer 32 output voltage
Or fall, the start-stop of motor 4 and the change of winding connection mode, all it is controlled by main control unit 1, specifically, master control
Unit 1 detects the change of current/voltage value according to detector unit 2 in manual command or work, after computing, sends corresponding
Instruction, controls the Guan Bi of catalyst in electromagnetic actuator 31 and reaches to control the start-stop of actuator and adjust the work electricity of motor
Pressure.
Fig. 2 is the major loop electrical schematic diagram of the embodiment of the present invention.As in figure 2 it is shown, and combine Fig. 1 and illustrate, TM1,
TM2 and TM3 is the three-phase transformer 32 in 3 Fig. 1；U, V, W are 3 phase lines of power subsystem 6, and N is the neutral conductor；Primary air is opened
Closing QF1 is the big electric current of transformer secondary level and the switch of KMY and KM Δ, and auxiliary air switch QF2 is the switch of KM1～KM6；
The side of catalyst KM1 three-phase contact meets 1a, 1b, 1c respectively, the N line of another side joint power subsystem 6；The side of catalyst KM2
Meeting 1a, 1b, 1c, opposite side meets U, V, W of power subsystem 6 respectively；Catalyst KM3 side meets 2a, 2b, 2c respectively, another side joint
U, V, W of power subsystem 6；Catalyst KM4 side meets 3a, 3b, 3c respectively, U, V, W of another side joint power subsystem 6；Catalyst
Side, KM5 three-phase contact meets 4a, 4b, 4c respectively, and offside meets the U of power subsystem 6, V, W respectively；Catalyst KM6 three-phase contact is divided
Do not meet 4a, 4b, 4c, the N line to side joint power subsystem 6；It is that a meets y, b and meets z that motor M winding and catalyst KM Δ concrete connects,
C meets x；And catalyst KMY side connects x, y, z respectively, and offside contact short-circuit line short circuit；Motor in motor M i.e. Fig. 1
4, motor M are y series motor.
Three-phase transformer TM1, three-phase transformer TM2 and three-phase transformer TM3 boosting or reduced output voltage are by catalyst
The different opening and closings of KM1, catalyst KM2, catalyst KM3, catalyst KM4, catalyst KM5 and catalyst KM6 have been combined.
Under any state, 6 catalysts of connection transformer part have 2 and 2 catalysts must be had simultaneously to work；And
When starting every time, catalyst KM1 and catalyst KM6 must be closed at, i.e. voltage does not rise and do not drops guarantee motor M full voltage starting.
Change motor M winding connection mode be by catalyst KM △ and two catalysts of catalyst KMY and motor M three-phase around
Group is constituted, but for the special operation condition of oil pumper, must assure that motor winding is connected into angle scheme, it is ensured that motor during start every time
M full voltage starting.
Further, motor winding obtains running voltage 380V～11 kinds of changes of 167.5V are to be done by procedure below
Arrive.During power transmission, catalyst KM1 and catalyst KM6 Guan Bi, now transformer secondary output is output as zero, is similar to current transformer
Secondary short circuit；As now made catalyst KM Δ close by start button, motor M winding by angle scheme full voltage starting and works
(380 ± 0V)；After operating steadily, current signal that controller detects according to the current transformer in detector unit 2 and motor M
Virtual voltage judges to reduce voltage, makes catalyst KM1 disconnect, catalyst KM △, catalyst KM6 and catalyst KM2 Guan Bi；This
Time motor M every phase winding running voltage be about 350V(380-17.5V) (hereinafter referred to as electric moter voltage)；Catalyst KM △,
Catalyst KM6, catalyst KM3 Guan Bi electric moter voltage is about 320V(380-2*17.5V)；Catalyst KM △, catalyst KM6
Close with catalyst KM4, electric moter voltage about 290V(380-3*17.5)；When catalyst KM △ disconnects and catalyst KM6 disconnection,
When catalyst KMY, catalyst KM1 and catalyst KM3 Guan Bi, electric moter voltage 272.5V(220+3*17.5V)；Catalyst KMY, connect
Tentaculum KM1, catalyst KM4 close, electric moter voltage 255V(220+2*17.5V)；Catalyst KMY, catalyst KM1 and catalyst
During KM5 Guan Bi, electric moter voltage 237.5V(220+17.5V)；When catalyst KMY, catalyst KM1 and catalyst KM6 close, electricity
Dynamo-electric pressure 220V(220 ± 0V)；Catalyst KMY, catalyst KM6 and catalyst KM2 close electric moter voltage 202.5V(220-
17.5V)；When catalyst KMY, catalyst KM6 and catalyst KM3 close, electric moter voltage 185V(220-2*17.5V)；Work as contact
When device KMY, catalyst KM6 and catalyst KM4 Guan Bi, electric moter voltage 167.5V(220-3*17.5V).Main control unit 1 is in work
In automatically according to the current value detected and magnitude of voltage, automatically select between above 11 kinds of voltages according to loading condition through computing
Optimum operating voltage, it is ensured that motor M is operated in maximum energy-saving state.
Further, according to three-phase transformer TM1, three-phase transformer TM2 and three-phase transformer TM3 Same Name of Ends, different name
Hold different connection methods can change voltage-phase, and then change the running voltage of motor M.Specifically, because becoming three-phase transformer
32 secondary low-voltage big electric current winding coil is serially connected in motor M winding loop, if primary and secondary Same Name of Ends is all through switchgear
Connect with the phase line of power supply, then output voltage relatively supply voltage reduces three-phase transformer 32 secondary voltage output valve；Otherwise
Output voltage relatively input supply voltage increases three-phase transformer 32 secondary voltage output voltage values.At motor M angle in the present invention
During shape connection, but motor M voltage supply voltage (380 ± 0V), i.e. and transformer secondary output is output as zero；17.5 can also be reducedV、2*17.5V、3*17.5V, i.e. 350V, 320V, 290V.If still needing to blood pressure lowering, motor M winding need to change star into and connect
Line, but the running voltage of the simple star connection every phase winding of motor M is 380/V i.e. 220V, but now catalyst KMY, contact
Device KM1 and catalyst KM3 Guan Bi, motor M winding voltage is 272.5V (220+3*17.5V)；In like manner catalyst KMY, catalyst
KM1 and catalyst KM4 Guan Bi, motor M winding voltage 255V(220+2*17.5V)；Catalyst KMY, catalyst KM1 and KM5 close
Closing, motor M winding voltage is 237.5V(220+17.5V)；Catalyst KMY, catalyst KM6 and catalyst KM1 Guan Bi, motor M
Winding voltage is 220V(220 ± 0V)；According in like manner catalyst KMY, catalyst KM6 and catalyst KM2 Guan Bi, motor M winding electricity
Pressure 202.5V(220-17.5V)；Catalyst KMY, catalyst KM6 and catalyst KM3 Guan Bi, motor M winding voltage 185V(220-
2*17.5)；Catalyst KMY, catalyst KM6 and catalyst KM4 Guan Bi, motor M winding voltage 167.5V(220-3*17.5V),
Amount to 11 pressure regulation gears.
Pressure regulation base level potential difference value Vjc and transformer tapping number Cts, pressure regulation gear number Dws can be according to following methods meter
Calculate: Dws=3* (Cts+1)+2；(note Dws, Cts should be positive integer), i.e. 8 gears of 1 tap of transformator；2 taps 11
Gear；14 gears during 3 taps.Basic voltage level difference Vjc=(380-220)/[Cts+2+ (Cts+1) *];Concrete number
Value is convenient it is contemplated that suitably round up for transformer winding, if basic voltage level difference is 17.5V, and two taps, i.e. Cts=
2, Vjc=17.5V, and motor M concrete blood pressure lowering value when dihedral connection should be*17.5=30V。
Being calculated as follows of required transformator rated capacity, base level potential difference value is multiplied by divided by phase voltage (220V) again to be controlled
Motor M power number.If motor M power 37KW, the differential 17.5V of basic voltage, therefore required transformer capacity S=17.5/220*37=
3KW, transformer capacity S/ power of motor=3/37=0.081, therefore the capacity of required transformator is controlled power of motor
8%。
Embodiment described above only expresses embodiments of the present invention, and it describes more concrete and detailed, but can not
Therefore it is construed as limiting the scope of the patent.It should be pointed out that, to those skilled in the art, not
On the premise of departing from the present invention, it is also possible to making some deformation, equal replacement, improvement etc., these broadly fall into the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (8)
1. the pressure regulating energy-saving actuator for beam pumping unit, it is characterised in that including:
Main control unit, detects operating current and the voltage of motor in pressure regulating energy-saving actuator in real time, calculates the work of described motor
Make electric current and voltage, be used for sending the adjustment instruction of the control instruction of actuator start-stop and motor operating voltage；
Detector unit, is connected with main control unit, the working current value of motor and magnitude of voltage in pressure regulating energy-saving actuator
Detect；
Voltage-adjusting unit, is connected with described main control unit, the operating voltage range for making motor winding be 380V～
The sine wave of 167.5V；
Motor, is connected with described voltage-adjusting unit, for controlling the start-stop of actuator.
A kind of pressure regulating energy-saving actuator for beam pumping unit the most according to claim 1, it is characterised in that also
Including:
Man-machine interaction unit, carries out visualization display for the current value described detector unit being detected and magnitude of voltage, and
For described main control unit being controlled the input of order.
A kind of pressure regulating energy-saving actuator for beam pumping unit the most according to claim 1, it is characterised in that institute
State voltage-adjusting unit to include:
Three-phase transformer, armature winding has tap, and for changing the running voltage of motor, and the capacity of required transformator is institute
Control the 8% of power of motor；
Electromagnetic actuator, the instruction sent according to described control unit, for controlling the armature winding of described three-phase transformer
Different taps are respectively connected to three phase mains and first and last terminates into three phase mains or N line, and control motor winding and be connected into angle-type scheme
Or star-star connection, and control the connecting and disconnecting of motor simultaneously.
A kind of pressure regulating energy-saving actuator for beam pumping unit the most according to claim 1, it is characterised in that institute
Stating motor is y series motor.
A kind of pressure regulating energy-saving actuator for beam pumping unit the most according to claim 3, it is characterised in that institute
The secondary winding coil stating three-phase transformer is serially connected in the winding loop of described motor.
A kind of pressure regulating energy-saving actuator for beam pumping unit the most according to claim 3, it is characterised in that institute
Stating three-phase transformer is that the connection method using Same Name of Ends different with different name end changes voltage-phase.
A kind of pressure regulating energy-saving actuator for beam pumping unit the most according to claim 3, it is characterised in that institute
The tap number stating three-phase transformer armature winding is 2, and 2 lead-out wires are drawn in each tap.
A kind of pressure regulating energy-saving actuator for beam pumping unit the most according to claim 3, it is characterised in that institute
State the armature winding difference tap that electromagnetic actuator controls described three-phase transformer by catalyst and be respectively connected to three phase mains
And first and last terminates into three phase mains or N line, and control motor winding and be connected into angle-type scheme or star-star connection, and control motor simultaneously
Connecting and disconnecting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610889002.XA CN106330054A (en) | 2016-10-12 | 2016-10-12 | Voltage-regulating and energy-saving dragging device for beam-pumping unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610889002.XA CN106330054A (en) | 2016-10-12 | 2016-10-12 | Voltage-regulating and energy-saving dragging device for beam-pumping unit |
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| Publication Number | Publication Date |
|---|---|
| CN106330054A true CN106330054A (en) | 2017-01-11 |
Family
ID=57821299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610889002.XA Pending CN106330054A (en) | 2016-10-12 | 2016-10-12 | Voltage-regulating and energy-saving dragging device for beam-pumping unit |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11164559A (en) * | 1997-11-28 | 1999-06-18 | Toshiba Corp | Ac voltage adjusting apparatus |
| CN201113876Y (en) * | 2007-09-29 | 2008-09-10 | 孙晓飞 | Oil pumping machine dedicated multi- power integral energy-saving actuator |
| CN201504223U (en) * | 2009-06-09 | 2010-06-09 | 黄中明 | Multi-power energy-saving motor for oil pumping unit |
| CN201639534U (en) * | 2010-05-12 | 2010-11-17 | 哈尔滨东大方正电力有限公司 | Voltage control and electricity-stealing preventing device of pumping unit motor |
| CN201956965U (en) * | 2011-04-15 | 2011-08-31 | 梁霄 | Voltage adjusting energy-saving dragging device used by oil field pumping unit |
| CN201956964U (en) * | 2011-03-03 | 2011-08-31 | 东北石油大学 | Energy-saving controller for combined pumping unit in oilfield |
-
2016
- 2016-10-12 CN CN201610889002.XA patent/CN106330054A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11164559A (en) * | 1997-11-28 | 1999-06-18 | Toshiba Corp | Ac voltage adjusting apparatus |
| CN201113876Y (en) * | 2007-09-29 | 2008-09-10 | 孙晓飞 | Oil pumping machine dedicated multi- power integral energy-saving actuator |
| CN201504223U (en) * | 2009-06-09 | 2010-06-09 | 黄中明 | Multi-power energy-saving motor for oil pumping unit |
| CN201639534U (en) * | 2010-05-12 | 2010-11-17 | 哈尔滨东大方正电力有限公司 | Voltage control and electricity-stealing preventing device of pumping unit motor |
| CN201956964U (en) * | 2011-03-03 | 2011-08-31 | 东北石油大学 | Energy-saving controller for combined pumping unit in oilfield |
| CN201956965U (en) * | 2011-04-15 | 2011-08-31 | 梁霄 | Voltage adjusting energy-saving dragging device used by oil field pumping unit |
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