CN2443472Y - Energy-saving transformer for pumping unit - Google Patents

Energy-saving transformer for pumping unit Download PDF

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CN2443472Y
CN2443472Y CN 00257903 CN00257903U CN2443472Y CN 2443472 Y CN2443472 Y CN 2443472Y CN 00257903 CN00257903 CN 00257903 CN 00257903 U CN00257903 U CN 00257903U CN 2443472 Y CN2443472 Y CN 2443472Y
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phase
control circuit
branch road
switch
contactor
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CN 00257903
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Chinese (zh)
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郝伟
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Abstract

The utility model relates to an energy-saving transformer for oil pumping machines, which is used for the oil production. The utility model comprises a capacity regulating transformer (TB) which is composed of a three-phase primary winding with a middle tap, a three-phase secondary winding, and an iron core [1], a three-phase dual change-over switch (TK) which is used for the capacity regulation to the capacity regulating transformer (TB), and a controlling part which is composed of a controller power supply transformer (KB), a controller [2], and a driving motor (KD) for controlling the change-over switch. The utility model solves the problem that the prior art can not carry out the automatic capacity regulation on load according to the load change and has the advantages of favorable effect of energy saving, and reliable performance. The utility model is used for oil pumping devices by utilizing the electric energy of motors for supply and control.

Description

The used for oil extractor energy-economic transformer
The utility model relates to a kind of transformer, particularly a kind of used for oil extractor energy-economic transformer of gathering oil.
At present, the transformer that oil-field oil pumper uses all is the plain edition power transformer, it mainly is made of three-phase primary windings (high pressure winding), iron core and three-phase secondary winding (low pressure winding), the input termination power line of its three-phase primary windings, the output termination load that three-phase is secondary group is the used for oil extractor driving motor.Because the number of turn separately of the elementary secondary winding of this transformer is changeless, just makes its rated capacity immobilize.When electric current normally normally moves and the motor of oil pumper starts with load 6 times of rated current, and starting torque is also bigger, this is generally 2～3 times of pumping-unit motor capacity with regard to the rated capacity that requires above-mentioned plain edition power transformer, and this numerical value immobilizes, therefore its weak point is, it can not change and automatic pondage value along with the motor load of oil pumper, occurs " phenomenon of low load with strong power ", thereby causes unnecessary waste of energy.
The purpose of this utility model is, a kind of used for oil extractor loaded capacity-regulated transformer that can regulate self capacity according to load variations automatically is provided.
In order to achieve the above object, the solution that the utility model is taked is, it comprises three-phase primary windings, iron core and three-phase secondary winding, the input of described three-phase primary windings connects three-phase ac power cord respectively, the output termination load of described secondary winding, be characterized in, respectively described three-phase just organize winding separately input and associated end between be provided with in order to change its primary tap of the number of turn separately, between its corresponding end of described three-phase secondary winding output separately, be provided with respectively in order to change its secondary winding tap of the number of turn separately.Turn ratio after the described three-phase primary windings and the three-phase secondary winding number of turn change, be same as the turn ratio that does not change preceding described three-phase primary windings and three-phase secondary winding, between each end of described three-phase primary windings and three-phase secondary winding and each tap, be provided with three-phase duplex diverter switch, described three-phase duplex diverter switch is being switched between each terminal head of described three-phase primary windings and the corresponding primary tap and between each terminal head of described three-phase secondary winding and corresponding secondary winding tap synchronously, with three-phase ac power cord that described three-phase primary windings input is connected on, also be parallel with by the controller power source transformer, controller and being used to is controlled the loop that the drive motors of described three-phase duplex diverter switch action is formed by connecting, between the power input of the output of described controller power source transformer secondary output winding and described controller, be provided with control switch.Above-mentioned three-phase primary windings is provided with the structure of primary tap, being equal to elementary winding is formed by elementary winding and elementary auxiliary winding serial connection, its serial connection point is the structure of above-mentioned tapping point, and the equivalent structure of described secondary winding tap is identical with said structure.When adopting said structure, the connected mode of three-phase primary windings is a Y connection etc., and the connected mode of three-phase secondary winding is Y connection, delta connection and Y 0Connection, promptly transformer primary and secondary winding connection method is Y/Y, Y/ △, Y/Y 0Deng.Above-mentioned controller power source transformer can be three-phase transformer, also can be single-phase transformer.
The automatic control equipment that above-mentioned controller preferably is made of control circuit of drive motors and secondary control circuit, control circuit of described drive motors is the three phase electric machine positive and reverse rotation control circuit that one group of main contacts by one group of main contacts of an A.C. contactor and another A.C. contactor constitutes, three phase electric machine is just changeing control circuit, monophase machine positive and reverse rotation control circuit or monophase machine are just changeing control circuit, described secondary control circuit is one and comprises described A.C. contactor, auxiliary relay, the control circuit that the time relay and the limit switch that described three-phase duplex diverter switch is carried out spacing control are formed by connecting at interior components and parts, the power input of a control circuit of described drive motors connects described control switch, and the power supply of described secondary control circuit is obtained from the power input of a control circuit of above-mentioned drive motors.Control circuit of above-mentioned drive motors promptly can be the three phase electric machine positive and reverse rotation control circuit, also can be the monophase machine control circuit.
When the used for oil extractor electric motor starting, one group of moving contact of described three-phase duplex diverter switch is connected on each primary tap of three-phase primary windings of the utility model transformer, its another group moving contact is connected in each secondary winding tap of described three-phase secondary winding, make the capacity of transformer bigger, thereby satisfied the requirement that used for oil extractor electric motor starting capacity is big, moment is big.After the used for oil extractor motor runs well, its desired volume is less, this moment is under the control of described controller, be used to control the drive motors running of above-mentioned three-phase duplex diverter switch action, drive above-mentioned three-phase duplex diverter switch action, make its two groups of moving contacts whiles (synchronously) automatically switch to each each end terminal and the three-phase secondary winding of above-mentioned three-phase primary windings, turn ratio between three-phase primary windings and the secondary winding is constant at this moment, but transformer capacity has reduced, thereby reach the purpose that the automatic capacity transfer of transformer when carrying is arranged, reduce transformer noload losses, avoided waste of electric energy.
For simple control structure, control circuit of above-mentioned drive motors preferably one group of main contacts by second A.C. contactor exchanges the one group of motor positive inversion control circuit that main contacts is formed by connecting that contacts with the 3rd, described secondary control circuit is by first branch road, second branch road, the 3rd branch road, the 4th branch road is formed in parallel, any two inputs in the power input of its two ends point in parallel and a control circuit of described drive motors are electrically connected, a switch of described first the manual duplex stop button of route switch, the parallel circuits that first normally opened contact of manual starting push-button switch and described first A.C. contactor constitutes, the branch circuit that second normally opened contact of first ac contactor coil and first auxiliary relay is in series, described second branch road is another switch by described manual duplex stop button switch, the described first auxiliary relay coil, the parallel circuits that the normally opened contact of first normally opened contact of above-mentioned first auxiliary relay and big capacity position limit switch constitutes, the branch circuit that the three is in series, described the 3rd branch road is by second ac contactor coil, the normally-closed contact of described first A.C. contactor, the branch circuit that the normally-closed contact of big capacity position limit switch is in series, the normally-closed contact of described parallel circuits of the 4th route and low capacity position limit switch is in series, described parallel circuits is formed in parallel by the 5th branch road and the 6th branch road, described the 5th branch road is the branch road that the on-delay closing contact by the 3rd ac contactor coil and the time relay is in series, and described the 6th branch road is the branch road that second normally opened contact by described time relay coil and described first A.C. contactor is in series.
In order to play better control action, above-mentioned secondary control circuit preferably also comprises a current detection circuit that is used to detect the load circuit size of current and controls described three-phase duplex diverter switch action.
Because the utility model has adopted said structure, when used for oil extractor electric motor starting and normal operation, three-phase duplex diverter switch is under the control of controller and respective drive motor, switching synchronously between each end of three-phase primary windings and the respective taps and between each end of three-phase secondary winding and the respective taps simultaneously, thereby reach the purpose that transformer is had pondage when carrying, make it that larger capacity can be provided when electric motor starting, capacity can fall automatically after motor runs well, thereby reduced no-load loss, therefore, it has transformer capacity and can regulate automatically, effectively save electric power energy, advantage easy to use.
Below in conjunction with accompanying drawing the utility model is further described.
Fig. 1 is an overall electrical structure schematic diagram of the present utility model;
Fig. 2 is the schematic diagram of a control circuit of drive motors of controller part of the present utility model shown in Figure 1;
Fig. 3 is the electrical schematic diagram of the secondary control circuit of controller part of the present utility model shown in Figure 1;
Fig. 4 is the electrical schematic diagram of second kind of circuit structure of secondary control circuit of the present utility model.
In schematic diagram shown in Figure 1, the utility model comprises three-phase primary windings L A, L B, L C, iron core 1 and three-phase time group winding L a, L b, L c, described three-phase primary windings L A, L B, L CInput m 0, n 0, p 0Connect three-phase ac power cord respectively, described secondary winding L a, L b, L cOutput q 0, s 0, t 0Connect load, wherein, just organize winding L at described three-phase respectively A, L B, L CInput m separately 0, n 0, p 0With associated end m 2, n 2, p 2Between be provided with in order to change its primary tap m of the number of turn separately 1, n 1, p 1, respectively at described three-phase secondary winding L a, L b, L cOutput q separately 0, s 0, t 0Its corresponding terminal q 2, s 2, t 2Between be provided with in order to change its secondary winding tap q of the number of turn separately 1, s 1, t 1Described three-phase primary windings L A, L B, L CWith three-phase secondary winding L a, L b, L cTurn ratio after the number of turn changes is same as and does not change described three-phase primary windings L before the number of turn A, L B, L CWith three-phase secondary winding L a, L b, L cTurn ratio, at described three-phase primary windings L A, L B, L CEach end and three-phase secondary winding L a, L b, L cBetween each end and each tap, be provided with three-phase duplex diverter switch TK, described three-phase duplex diverter switch TK is at described three-phase primary windings L A, L B, L CEach terminal m 2, n 2, p 2With corresponding primary tap m 1, n 1, p 1Between and at described three-phase secondary winding L a, L b, L cEach terminal q 2, s 2, t 2With corresponding secondary winding tap q 1, s 1, t 1Between switch synchronously, with described three-phase primary windings L A, L B, L COn the three-phase ac power cord that input is connected, also be parallel with by controller power source transformer KB, controller 2 and be used to control the loop that the drive motors KD of described three-phase duplex diverter switch TK action is formed by connecting, between the power input of the output of described controller power source transformer KB secondary winding and described controller 2, be provided with control switch ZK 1In Fig. 1, three output q of three-phase secondary winding 0, s 0, t 0One group of (3) main contacts CJ through control switch ZK, the first A.C. contactor CJ -0Meet used for oil extractor motor CD with thermal relay RJ.
Above-mentioned controller 2 is the automatic control equipments that are made of control circuit of drive motors and secondary control circuit 4, control circuit of described drive motors is the three phase electric machine positive and reverse rotation control circuit that one group of main contacts by one group of main contacts of an A.C. contactor and another A.C. contactor constitutes, three phase electric machine is just changeing control circuit, monophase machine positive and reverse rotation control circuit or monophase machine are just changeing control circuit, described secondary control circuit is one and comprises described A.C. contactor, auxiliary relay, the control circuit that the time relay and the limit switch that described three-phase duplex diverter switch is carried out spacing control are formed by connecting at interior components and parts, the power input of a control circuit of described drive motors connects described control switch, and the power supply of described secondary control circuit is obtained from the power input of a control circuit of above-mentioned drive motors.In schematic diagram shown in Figure 2 and schematic diagram shown in Figure 3, control circuit 3 of above-mentioned drive motors be one by the second A.C. contactor CJ 2One group of main contacts CJ 2-1Contact CJ with the 3rd interchange 1One group of main contacts CJ 1-1The motor positive inversion control circuit that is formed by connecting, described secondary control circuit 4 is formed in parallel by first branch road 5, second branch road 6, the 3rd branch road 7, the 4th branch road 8, the power input a of its two ends point in parallel M, a N and a control circuit 3 of described drive motors 1, b 1, c 1In any two inputs be electrically connected, described first branch road 5 is by the first normally opened contact CJ of a switch, manual starting push-button switch QA and the described first A.C. contactor CJ of manual duplex stop button switch TA -1The parallel circuits, the first ac contactor coil CJ and first intermediate relay ZJ that constitute 1The second normally opened contact ZJ 1-2The branch circuit that is in series, described second branch road 6 are by another switch of described manual duplex stop button switch TA, the described first auxiliary relay coil ZJ 1, above-mentioned first intermediate relay ZJ 1The first normally opened contact ZJ 1-1Normally opened contact XK with big capacity position limit switch 1-1The parallel circuits that constitutes, the branch circuit that the three is in series, described the 3rd branch road 7 is by the second ac contactor coil CJ 2, the described first A.C. contactor CJ normally-closed contact CJ -2, big capacity position limit switch normally-closed contact XK 1-2The branch circuit that is in series, described the 4th branch road 8 is by the normally-closed contact XK of a parallel circuits and low capacity position limit switch 2Be in series, described parallel circuits is formed in parallel by the 5th branch road 9 and the 6th branch road 10, and described the 5th branch road 9 is by the 3rd ac contactor coil CJ 1On-delay closing contact SJ with time relay sj -1The branch road that is in series, described the 6th branch road 10 are second normally opened contact CJ by described time relay coil SJ and the described first A.C. contactor CJ -3The branch road that is in series.In Fig. 4, two some M, N in parallel of secondary control circuit 4 are connected on two input a of Fig. 1 middle controller 2 respectively 1, c 1On.Above-mentioned controller power source transformer KB is a three-phase transformer in Fig. 1.In Fig. 1, Fig. 2 and Fig. 3, when power supply (～10KV) connect after, above-mentioned by three-phase primary windings L A, L B, L C, iron core 1 and three-phase secondary winding L a, L b, L cCapacitance-adjustable transformer TB that constitutes and controller power source become device KB charged excitation simultaneously, and one group of moving contact of three-phase ganged switch TK meets L A, L B, L CPrimary tap m 1, n 1, p 1On, its another group moving contact meets L simultaneously a, L b, L cSecondary winding tap q 1, s 1, t 1On, promptly big capacity position, at this moment, the normally opened contact XK of big capacity position limit switch 1-1Closure, its normally-closed contact XK 1-2Disconnect intermediate relay ZJ 1Charged work, its normally opened contact ZJ 1-1, ZJ 1-2All closed, this moment, the no-load loss of capacitance-adjustable transformer TB was rated value.Can be when the needs oil pumper is worked with control switch ZK, ZK 1(herein being air switch) closure is pressed manual starting button QA, and the then charged work of the first A.C. contactor CJ makes one group main contacts CJ -0Closure, its first normally opened contact CJ -1With the second normally opened contact CJ -3Closure, its normally-closed contact CJ -2Disconnect the charged work of time relay sj.Used for oil extractor motor CD starting this moment.Through prefabricated time set, treat that used for oil extractor motor CD starting process is finished and entered normal operation after, the on-delay closing contact SJ of above-mentioned SJ -1Closure makes the 3rd A.C. contactor CJ 1Charged work, one group main contacts CJ 1-1Closure, then drive motors KD forward rotation (just changeing) drives TK and switches to transformer low capacity position, and promptly one of TK group of moving contact is connected on above-mentioned L A, L B, L CEach terminal m 2, n 2, p 2On, its another group moving contact is connected on above-mentioned L simultaneously a, L b, L cEach terminal q 2, s 2, t 2On, at this moment, TB is normally operation under the low capacity state, the normally-closed contact XK of low capacity position limit switch 2Disconnect CJ 1Outage, CJ 1-1Disconnect, drive motors KD stall, thus realizing that used for oil extractor motor CD starts to normal operation and capacitance-adjustable transformer TB is adjusted to the whole process of low capacity running status automatically by big capacity.In the handoff procedure of low capacity, TB has the instant cut-off phenomenon at big capacity, and this moment, oil pumper can be because its motion, the existence of inertia and be not subjected to the influence of circuit instant cut-off, still operate as normal incessantly.When needs manually stop oil pumper work, can press manual duplex shutdown switch (being hand push button), then CJ outage, ZJ 1Outage makes CJ -0Disconnect, motor CD quits work, meanwhile CJ -2Closed, ZJ 1-2Disconnect.Make press QA again can not actuating motor CD.At this moment, TK is in low capacity position, XK 1-1Disconnect XK 1-2Be in closure state, thereby make the second A.C. contactor CJ 2Charged work, one group main contacts CJ 2-1Closure, drive motors KD counter-rotating drives TK and oppositely switches, and switches back to big capacity position, at this moment XK 1-2Disconnect CJ 2Outage, CJ 2-1Disconnect drive motors KD stall, XK simultaneously 1-1Closure, intermediate relay ZJ 1Charged work, its first normally opened contact ZK 1-1Closure, self-locking, the second normally opened contact ZJ 1-2Closure is carried out interlocking.At this moment, could reset motor CD work by pressing QA.When the normal circuit in service of motor CD cut off the power supply, then the normally opened contact of each A.C. contactor and auxiliary relay disconnected, the normally-closed contact closure, and the main contacts of each A.C. contactor disconnects, and motor is in stop state, and this moment, above-mentioned TK was in the low capacity state.When circuit is sent a telegram here suddenly again, because XK 1-2Closure, CJ -2Closure makes CJ 2Charged work, one group main contacts CJ 2-1Closure, then drive motors KD counter-rotating makes TK switch to big capacity position, at this moment XK 1-2Disconnect CJ 2Outage, CJ 2-1Disconnect drive motors KD stall, XK simultaneously 1-1Closure, ZJ 1Charged work, its ZJ 1-1, ZJ 1-2Closure, just can reset motor CD work by pressing QA this moment, thereby prevented the appearance of misoperation effectively, improved security reliability of the present utility model.Certainly also above-mentioned secondary control circuit 4 can be designed to alternate manner, as putting M, N and a in two parallel connection 1, c 1Line be provided with fuse, or set up one and be used to detect the load circuit size of current, and control the current detection circuit that described three-phase duplex diverter switch TK moves, its circuit theory is known by those of ordinary skill, no longer describes in detail herein and also no longer provides diagram.In schematic diagram shown in Figure 4, secondary control circuit 4 is formed in parallel by above-mentioned first branch road 5, second branch road 6, the 3rd branch road 7 and the 4th branch road 8, above-mentioned each branch road is all same as shown in Figure 3, just the parallel circuits in the 4th branch road 8 by the 6th branch road 10, after changing the 5th branch road 12 and the 7th branch road 11 that increases newly be formed in parallel, element connected mode in the 5th branch road 12 after herein changing is identical with Fig. 3, just incites somebody to action SJ wherein -1Changed second intermediate relay ZJ into 2The second normally opened contact ZJ 2-2, the 7th branch road 11 is by second intermediate relay ZJ 2With above-mentioned SJ -1, second intermediate relay ZJ 2The first normally opened contact ZJ 2-1Both branch circuits of being in series of the parallel circuits that constitutes, the operation principle those of ordinary skill of the secondary control circuit 4 of this structure are appreciated that herein after with reference to Fig. 4 and no longer describe in detail.
When drive motors KD is monophase machine; KB should be single-phase transformer; control circuit 3 of drive motors also constitutes the monophase machine positive and reverse rotation control circuit by above-mentioned corresponding main contacts; this circuit is known by those of ordinary skill; no longer describe in detail herein; also no longer provide diagram, said structure also belongs to protection range of the present utility model.

Claims (5)

1, a kind of used for oil extractor energy-economic transformer comprises three-phase primary windings (L A, L B, L C), iron core [1] and three-phase time group winding (L a, L b, L c), described three-phase primary windings (L A, L B, L C) input (m 0, n 0, p 0) connect three-phase ac power cord, described secondary winding (L respectively a, L b, L c) output (q 0, s 0, t 0) connect load, it is characterized in that, respectively at described three-phase primary windings (L A, L B, L C) separately input (m 0, n 0, p 0) and associated end (m 2, n 2, P 2) between be provided with in order to change its primary tap (m of the number of turn separately 1, n 1, p 1), respectively at described three-phase secondary winding (L a, L b, L c) separately output (q 0, s 0, t 0) its corresponding end (q 2, s 2, t 2) between be provided with in order to change its secondary winding tap (q of the number of turn separately 1, s 1, t 1), described three-phase primary windings (L A, L B, L C) and three-phase secondary winding (L a, L b, L c) turn ratio after the number of turn changes, be same as and do not change described three-phase primary windings (L before the number of turn A, L B, L C) and three-phase secondary winding (L a, L b, L c) turn ratio, at described three-phase primary windings (L A, L B, L C) each end and three-phase secondary winding (L a, L b, L c) between each terminal and each tap, being provided with three-phase duplex diverter switch (TK), described three-phase duplex diverter switch (TK) is at described three-phase primary windings (L A, L B, L C) each terminal head (m 2, n 2, p 2) and corresponding primary tap (m 1, n 1, p 1) between and at described three-phase secondary winding (L a, L b, L c) each terminal head (q 2, s 2, t 2) and corresponding secondary winding tap (q 1, s 1, t 1) between switch synchronously, with described three-phase primary windings (L A, L B, L C) on the three-phase ac power cord that is connected of input, also be parallel with by controller power source transformer (KB), controller [2] and be used to control the loop that the drive motors (KD) of described three-phase duplex diverter switch (TK) action is formed by connecting, between the power input of the output of described controller power source transformer (KB) secondary winding and described controller [2], be provided with control switch (ZK 1).
2, used for oil extractor energy-economic transformer according to claim 1 is characterized in that, described controller power source transformer (KB) is three-phase transformer or single-phase transformer.
3, used for oil extractor energy-economic transformer according to claim 1, it is characterized in that, described controller [2] is the automatic control equipment that is made of a control circuit of drive motors [3] and secondary control circuit [4], a control circuit of described drive motors [3] is the three phase electric machine positive and reverse rotation control circuit that one group of main contacts by one group of main contacts of an A.C. contactor and another A.C. contactor constitutes, three phase electric machine is just changeing control circuit, monophase machine positive and reverse rotation control circuit or monophase machine are just changeing control circuit, described secondary control circuit [4] is one and comprises described A.C. contactor, auxiliary relay, the time relay and described three-phase duplex diverter switch (TK) carried out the control circuit that the limit switch of spacing control is formed by connecting at interior components and parts, the power input of a control circuit of described drive motors [3] meets described control switch (ZK 1), the power supply of described secondary control circuit [4] is obtained from the power input of a control circuit of above-mentioned drive motors [3].
4, used for oil extractor energy-economic transformer according to claim 3 is characterized in that, a control circuit of described drive motors [3] be one by the second A.C. contactor (CJ 2) one group of main contacts (CJ 2-1) contact (CJ with the 3rd interchange 1) one group of main contacts (CJ 1-1) motor positive inversion control circuit that is formed by connecting, described secondary control circuit [4] is formed in parallel by first branch road [5], second branch road [6], the 3rd branch road [7], the 4th branch road [8], the power input (a of its two ends points in parallel (M, N) and a control circuit of described drive motors [3] 1, b 1, c 1) in any two inputs be electrically connected, described first branch road [5] is by a switch of manual duplex stop button switch (TA), manual starting push-button switch (QA) first normally opened contact (CJ with described first A.C. contactor (CJ) -1) parallel circuits, first ac contactor coil (CJ) and the first auxiliary relay (ZJ that constitute 1) the second normally opened contact (ZJ 1-2) branch circuit that is in series, described second branch road [6] is by another switch of described manual duplex stop button switch (TA), the described first auxiliary relay coil (ZJ 1), the above-mentioned first auxiliary relay (ZJ 1) the first normally opened contact (ZJ 1-1) with the normally opened contact (XK of big capacity position limit switch 1-1) parallel circuits that constitutes, the branch circuit that the three is in series, described the 3rd branch road [7] is by the second ac contactor coil (CJ 2), the normally-closed contact (CJ of described first A.C. contactor (CJ) -2), the normally-closed contact (XK of big capacity position limit switch 1-2) branch circuit that is in series, described the 4th branch road [8] is by the normally-closed contact (XK of a parallel circuits and low capacity position limit switch 2) be in series, described parallel circuits is formed in parallel by the 5th branch road [9] and the 6th branch road [10], and described the 5th branch road [9] is by the 3rd ac contactor coil (CJ 1) with the on-delay closing contact (SJ of the time relay (SJ) -1) branch road that is in series, described the 6th branch road [10] is by the second normally opened contact (CJ of described time relay coil (SJ) with described first A.C. contactor (CJ) -3) branch road that is in series.
5, used for oil extractor energy-economic transformer according to claim 3 is characterized in that, described secondary control circuit [4] also comprises a current detection circuit that is used to detect the load circuit size of current and controls described three-phase diverter switch (TK) action.
CN 00257903 2000-10-18 2000-10-18 Energy-saving transformer for pumping unit Expired - Fee Related CN2443472Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 00257903 CN2443472Y (en) 2000-10-18 2000-10-18 Energy-saving transformer for pumping unit

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Application Number Priority Date Filing Date Title
CN 00257903 CN2443472Y (en) 2000-10-18 2000-10-18 Energy-saving transformer for pumping unit

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Publication Number Publication Date
CN2443472Y true CN2443472Y (en) 2001-08-15

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CN 00257903 Expired - Fee Related CN2443472Y (en) 2000-10-18 2000-10-18 Energy-saving transformer for pumping unit

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4383546A1 (en) * 2022-12-05 2024-06-12 Huawei Digital Power Technologies Co., Ltd. Power supply apparatus, three-phase transformer circuit, and charging pile
EP4383545A1 (en) * 2022-12-05 2024-06-12 Huawei Digital Power Technologies Co., Ltd. Power supply apparatus, three-phase transformer circuit, and charging pile

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4383546A1 (en) * 2022-12-05 2024-06-12 Huawei Digital Power Technologies Co., Ltd. Power supply apparatus, three-phase transformer circuit, and charging pile
EP4383545A1 (en) * 2022-12-05 2024-06-12 Huawei Digital Power Technologies Co., Ltd. Power supply apparatus, three-phase transformer circuit, and charging pile

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