CN2430812Y - Automatic power saving controller for oil pump motor - Google Patents

Abstract

The utility model relates to an automatic power saving controller for motors of oil pumping machines. A reactive-load compensator composed of three single-phase capacitors C are connected in parallel on a motor winding, and an automatic starting device formed by that a screw fuse RL and a self-locking button N are connected in series, a soft starting device formed by that AC contactors CJY and CJdelta and a time relay JS1 are connected in parallel, and a transnormal tracking regulation device formed by that current relays I1, I2 are connected in series are arranged on a motor control circuit. The principle that when an oil puming machine changes regularly, the controller doesn't track, when the oil puming machine changes not in regular, the controller tracks is utilized to achieve the purpose of comprehensive power saving. The utility model has the advantages of simple structure, complete function, convenient operation, convenient maintenance and low price and is an ideal starting control power saving device for motors of oil pumping machines.

Description

The automatic electricity-saving controller of motor of oil extractor

The utility model relates to the automatic electricity-saving controller of motor of a kind of motor automatic electricity-saving controller, particularly oil-field oil pumper.Belong to motor starting control field.

At present the oil pumper that generally adopts of oil field for the oil well ordinary production with it the motor of adapted generally all be greater than more than a times of normal power demand according to the selected rated power of starting conditions, motor has just caused the waste of the energy and has caused the reduction of device efficiency when underloading or no-load running like this, so solving the motor of oil extractor economize on electricity also is a big problem of present field operations, the oil field is adopted Y-△ switching controller, thyristor voltage regulation controller mostly now, and the microcomputerized control motor is finished the motor power saving function.But because oil-field oil pumper spreads all over the open country, mining area, long and the dispersion of distribution line, the induction-motor load rate is low, and load factor is on average less than 30% usually, and the load current cycle variation is between 30%～60%, and this can not solve comprehensive economize on electricity problem with regard to making above motor controller.

The purpose of this utility model is to provide a kind of can overcome the incomplete electricity-saving controller of above-mentioned economize on electricity, be a kind of oil field with the automatic electricity-saving controller of motor of oil extractor, mainly be can the load of motor be detected at any time, controller was not followed the tracks of and tracking during irregular variations when the oil pumper rule was changed, and accomplished comprehensive economize on electricity.

The technical solution of the utility model is achieved in that the automatic electricity-saving controller of motor of oil extractor is by current transformer, thermal relay, and A.C. contactor, the time relay, current relay, capacitor, control button and casing are formed.Wherein on motor windings, be parallel with the reactive-load compensator that constitutes by three single-phase electricity container C; And on the Electric Machine Control circuit, be provided with the automatic starting gear that is composed in series by plug fuse RL and self-locking button N and by A.C. contactor CJY and CJ △ and time relay JS ₁The soft starter device that composes in parallel reaches by current relay I ₁With I ₂The extraordinary rule that is composed in series is followed the tracks of adjusting device.

When the well array circuit have a power failure for some reason again recover to send electricity after, by predefined order from the circuit near-end to far-end actuating motor one by one, avoid impacting with the protection distribution equipment.Soft start function is that the needs decision according to the static torque of oil pumper is directly operation or Y-△ soft start Y or △ operation again of Y starting.Super rule tracker can desirable tracking motor load select motor when extraordinary rule changes automatically and reasonably Y delta connection mode to guarantee the safety electricity-saving operation of motor.Reactive-load compensator can move the reactive power of drawing from electrical network by the reasonable compensation empty load of motor, to reduce the active loss of electrical network.

Good effect of the present utility model is to provide a kind of oil field with the automatic electricity-saving controller of motor of oil extractor, and controller is not followed the tracks of and tracking during irregular variations when utilizing the oil pumper rule to change, and accomplishes comprehensive economize on electricity.This controller function is complete, and adaptability is strong, and is simple in structure, maintains easily, cheap.

Fig. 1 is the utility model structural representation.

Fig. 2, the 3rd, the utility model electrical schematic diagram.

Below in conjunction with drawings and Examples the utility model is described further: in Fig. 1, Fig. 2, in the primary circuit, insert automatic switch 1 mains side by power line, insert current transformer 2 through automatic switch 1, insert thermal relay 4 through current transformer 2, from thermal relay 4 mains side incoming transport contactors 5 mains sides, from A.C. contactor 5 load side incoming transport contactors 6 load side, exchange contact 6 mains side short circuits.From automatic switch 1 load side joint power capacitor 3. Access node terminal 1,2,3; 6,4,5 connect motor.More than connect and compose primary circuit (major loop).Referring to Fig. 3, secondary circuit (control loop) is got the 220V power supply from automatic switch 1 load side A phase and 0 line, through plug fuse RL10, meets signal lamp DX8, through locking press button N9, meets time relay JS ₁11, through master switch L7, meet time relay JS ₂13, with current relay I ₁12, I ₂14, then through the time relay 11,13, A.C. contactor 5,6 auxiliary contacts are connected with the coil of A.C. contactor CJY6, CJ △ 5, constitute secondary circuit.

Be parallel with capacitor on the motor windings, mainly play motor and on electrical network, draw the compensating action of reactive power, thereby reduction active loss, control loop is obtained 220 volts of voltages from A phase and 0 line, through self-locking control button N, at this moment the on of proof control loop can press self-locking control button N when signal lamp DX shows energising through spiral fuse RL and signal lamp DX, time relay JS1 energising, time-delay contact is also connected simultaneously.At this moment just select y-△ tie lines start-up function automatically, can make the electric motor starting electric current reduce to 1.5 times by 5 times of quota electric current according to mechanical static torque needs.As the machinery of pumping is in the low torque state at prestart, can directly enter running status by Y type starting; Underloading brownout operation electricity-saving function according to the oil pumper light running, and is the characteristics that upper and lower stroke size of current periodic law changes, and this device has designed under the situation that normal rule changes and do not followed the tracks of levelling, and operates in optimum state.Have only under the situation that oil well condition changes, when the stroke electric current exceeds normal rule and changes up and down, device is just followed the tracks of and is entered another kind of optimum state, so both satisfied the requirement of underloading power-saving running, overcome the drawback of unnecessary frequent levelling when rule changes again, both prolonged the useful life of switchgear and motor, and power savings is better; And when electric power system have a power failure for some reason again recover to send electricity after, this device can make pumping-unit motor from the circuit near-end by predefined time sequencing by batch actuating motor, be not hit with the protection distribution equipment; When and go on foot motor and insert electrical network after, to absorb a large amount of ammeter electric current I o (generally accounting for the 25-40% of rated current) and almost irrelevant from electrical network with load variations, therefore having a strong impact on cos φ (cos φ≤0.2 when unloaded) thus cause the active power loss of electrical network, this loss is until charging point from motor, therefore, and characteristics of disperseing big at oilfield electric net are so compensate best results at the motor place.Because generally all through 4 transformations, circuit is long again for oilfield electric net, the economic equivalent of reactive power compensation generally gets 0.12.A large amount of experimental datas show that the meritorious power saving rate of motor of oil extractor self is at 10% o'clock, and always meritorious power saving rate can reach 15-20%, is 1.5-2 times of the own power savings of motor, and this is real power savings.

Claims (1)

1. automatic electricity-saving controller of motor of oil extractor, be by the air automatic switch, current transformer, thermal relay, A.C. contactor, time breaker, current relay, capacitor, control button and casing are formed, it is characterized in that: the reactive-load compensator that empty load of motor is carried out reactive power compensation that is parallel with on motor windings that three single-phase electricity container C form is provided with the automatic starting gear that is composed in series by plug fuse RL locking press button N and by A.C. contactor CJY and CJ △ and time relay JS on the Electric Machine Control circuit ₁The soft starter that composes in parallel reaches by current relay I ₁And I ₂The extraordinary rule that series connection constitutes is followed the tracks of adjusting device.

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