CN2315718Y

CN2315718Y - Star-delta conversion energy saving device for single chip machine controlled oil pumping motor

Info

Publication number: CN2315718Y
Application number: CN 97233784
Authority: CN
Inventors: 杨学军
Original assignee: GUDAO OIL PRODN PLANT SHENGLI PETROLEUM ADMINISTRATION
Current assignee: GUDAO OIL PRODN PLANT SHENGLI PETROLEUM ADMINISTRATION
Priority date: 1997-06-29
Filing date: 1997-06-29
Publication date: 1999-04-21
Anticipated expiration: 2007-06-29

Abstract

The utility model discloses a star-delta conversion energy-saving device for an oil pumping motor controlled by a single chip machine, which belongs to the technical field of control and adjustment of a motor. The utility model is composed of the single chip machine, a data program memory, a keyboard, a display, a fault display circuit, a star-delta display circuit, a current detection circuit, a star-delta control circuit for the oil pumping motor, and a main loop of the oil pumping motor, wherein the current detection circuit is connected with an input terminal of the single chip machine, and the star-delta control circuit of the oil pumping motor is connected with an output terminal of the single chip machine. The utility model can automatically detect the actual power of the oil pumping motor and compare the actual power with the rated power, and can automatically convert the star-delta connection mode to make the rated power match with the actual power. Thereby, the electricity is greatly saved and the motor is protected.

Description

Single-chip Controlling oil pumping motor star angle conversion energy-conserving device

The utility model relates to the control or the adjusting of motor.Particularly, be a kind of by Single-chip Controlling oil pumping motor star angle conversion energy-conserving device.

At present, oil field oil pumping motor control cubicle has several, the start and stop that can only control oil pumping motor that have, and what have can control the motor start and stop, and the function of protection motor is arranged again, and what have also has certain electricity-saving function concurrently.For example: " motor protection starts and battery saving arrangement " (patent No. 89216386.0); its major function is control motor start and stop and protection motor; also because the contactor coil in the oil pumping motor major loop is adopted the dc low-voltage power supply; the copper loss and the iron loss of contactor have been reduced; simultaneously in major loop, add building-out capacitor again, so certain power savings is also arranged.Again for example: " the anti-flicker economize on electricity of motor restarting automatic control cabinet " (patent No. 92211257.6).Its main purpose is to solve at thunderstorm season, when after electrical network is struck by lightning dead electricity, sending a telegram here again, and oil pumping motor restarting difficulty, A.C. contactor is switched on and the problem of wasting electric energy for a long time.These two existing patented technologies all do not go to solve the economize on electricity problem from oil pumping motor itself, and its power savings is not remarkable.In the oil pumping motor actual motion of oil field, since the variation of load, the phenomenon of often appearance " big horse control dolly ".When its actual operating power during less than its rated power, power factor is just handed over very lowly, and power factor is low more, and waste of energy is also just big more, and power factor is on average about 0.45.Because oil field oil pumping motor power consumption is too big, so its economize on electricity problem is also just more important.Another shortcoming of the control cubicle that has is to have used magnetic starter in the oil pumping motor major loop, opens at motor, the stopping time can produce the control arc, not only can quicken to burn out its main contacts, even can cause the motor open-phase running, and motor is burnt.

The purpose of this utility model is the above-mentioned shortcoming that overcomes prior art, and a kind of unusual intelligentized Single-chip Controlling oil pumping motor star angle conversion energy-conserving device is provided.Its major function is to save a large amount of electric energy, and another function is to prolong oil pumping motor major loop useful life and protect oil pumping motor normally to move.

Above-mentioned purpose is realized by following technical proposals: this device is made up of single-chip microcomputer (1), data program memory (2), keyboard and display (3), fault demonstration and star angle display circuit (4), current detection circuit (5), oil pumping motor star angle control circuit (6), oil pumping motor major loop (7).The input of single-chip microcomputer (1) and current detection circuit (5) join, and the output of single-chip microcomputer (1) and oil pumping motor star angle control circuit (6) join.Star angle control circuit (6) is controlled oil pumping motor major loop (7) by auxiliary relay, realizes the conversion of oil pumping motor star corner connection line.Single-chip microcomputer (1) shows with data program memory (2), keyboard and display (3), fault respectively by data and address bus and star angle display circuit (4) joins.

Oil pumping motor star angle control circuit (6) in this device, by not gate and or the interlock circuit formed of door, automatic and manual change-over switch, two bidirectional triode thyristors, two auxiliary relays, a start button and a stop button form.Two outputs of interlock circuit are connected with two bidirectional triode thyristor control utmost points respectively.The normally-closed contact of two auxiliary relays connects in the mode of interlocking each other.Opening, stop button is connected in the manual control branch road.This circuit is with exchanging 220 volts as power supply.

Oil pumping motor major loop (7) in this device, by merely hit six normally opened contacts of a relay of six bidirectional triode thyristors and two, and compositions such as protection electric capacity, current-limiting resistance.Wherein there are three bidirectional triode thyristors and oil pumping motor three phase windings to connect into the star-like mode of connection; Other three bidirectional triode thyristors and oil pumping motor three phase windings connect into the angle-type scheme mode.Wherein three normally opened contacts of merely hitting a relay are being controlled the controllable silicon that three stars connect mode; Other 1 three normally opened contacts of merely hitting a relay are being controlled the controllable silicon of three corner connection modes.

Theoretical foundation of the present utility model is that China Machine Press publishes " Factory Electricity Supply " and points out that when motor was operated in rated load, stator winding was made the angle type and connected, and when motor load is reduced to 50% when following, can change star-like connection into.Because the oil pumping motor of oil field more than 95%, when 380 volts of rated voltages, stator winding adopts angle type connected mode, so after this device is implemented by technique scheme, when the actual load of oil pumping motor be higher than its rated load 50% the time, it is constant to make motor main circuit be in the corner connection state; When the actual load of oil pumping motor be lower than its rated load 50% the time, can make motor main circuit convert star automatically to and connect state by the corner connection state, also just equal to have reduced the rated load value of motor, motor rated load and actual load after star is connect are complementary, can improve the power factor of motor like this, reach the purpose of a large amount of economize on electricitys.Because every mouthful of oil well situation difference, power savings is also had any different, and the economize on electricity scope is 10 to 40%, and this is that prior art institute is inaccessible.Also, no longer produce the arcing phenomenon, can increase the service life more than the twice, and can protect oil pumping motor normally to move effectively because motor main circuit has replaced magnetic starter with bidirectional triode thyristor.Owing to be provided with automatic, manual change-over switch, when automatics breaks down, can be switched to manual state, can not have influence on the oil well ordinary production.

Accompanying drawing 1 is the whole block diagram that constitutes of the present utility model.

Accompanying drawing 2 is circuit theory diagrams of the present utility model.

In conjunction with the accompanying drawings embodiment of the present utility model is described below:

Fig. 1, in 2, single-chip microcomputer (1) is selected the MCS series of products for use, it not only has logic determines and formula computing function, also have advantages such as fast reaction and controllability are good, and house dog can be set in its software, the program fleet that causes for the various interference in the program operation process carries out forced resetting, effectively avoid the further expansion of fault, data program memory (2) adopts EPROM, EEPROM, chips such as RAM, particularly eeprom chip can charged erasable program, and program and data can not lost under the dead electricity situation, are present more satisfactory storage chips.It is managing chip that keyboard and display (3) adopt programmable 8279 chips, is used for supervisory keyboard and display, thereby has saved the time of coming supervisory keyboard and display to take with single-chip microcomputer greatly, has improved the operating efficiency of single-chip microcomputer.It is managing chip that fault demonstration and star angle display circuit (4) have adopted programmable 8255A chip, can make 8 parallel-by-bit output interfaces of single-chip microcomputer expand to three by one, and output function is further strengthened.Current detection circuit (5) is made up of current transformer CT and power pack A/V, and current transformer is selected LM-0.5 for use, and power pack is selected FS4 for use.Star angle control circuit (6) is by four not gates and two or an interlock circuit that constitutes (not gate selects 7407 for use), automatically and manual change-over switch HK, two bidirectional triode thyristor KS1, KS2, two merely hit relay ZJ1, ZJ2, a start button QA and a stop button TA form.Two merely hit a relay normally-closed contact in star angle control circuit (6) each other the interlocking.Open, stop button and be connected in the manual control branch road, this circuit is to exchange 220 volts as power supply.Owing to use bidirectional triode thyristor as isolated component between the triggering level of single-chip microcomputer output and the auxiliary relay, make light current and forceful electric power effective isolation, improved the antijamming capability of control device.Above-mentioned interlock circuit mainly be for prevent when single-chip microcomputer output pin P1.0, when P1.1 is high level, two actuatings of relay in the angle control circuit in making (6) cause six bidirectional triode thyristor KS3 to the KS8 false triggering in the oil pumping motor major loop (7) and cause the oil pumping motor phase fault.Oil pumping motor major loop (7) is by six bidirectional triode thyristor KS3 to KS8 and two merely hit a relay ZJ1, ZJ2 normally opened contact, and capacitor C 1, resistance R 1, R2 are formed.Bidirectional triode thyristor KS3, KS4, KS5 are one group, constitute oil pumping motor major loop angle-type scheme, and its trigger voltage is controlled by three normally opened contacts of intermediate relay ZJ 1.Bidirectional triode thyristor KS6, KS7, KS8 are another group, constitute the star-like wiring of oil pumping motor major loop, and its trigger voltage is controlled by three normally opened contacts of intermediate relay ZJ 2.

The course of work of this device is: when recording oil pumping motor work by current transformer CT, the current analog amount of two-phase wherein, respectively through a1, a2 and c1, c2 pin, give power pack A/V, make its current analog amount convert voltage analog to, voltage analog is given P1.2 to the P1.5 pin of single-chip microcomputer more respectively, in single-chip microcomputer voltage analog is converted into digital quantity, and handles calculating.Actual power when single-chip microcomputer calculates machine operation and the rated power of motor compare.Actual power when the oil pumping motor corner connection is worked less than its rated power 50% the time, the P1.1 pin of single-chip microcomputer just sends the triggering level signal that the motor star is connect, after carrying out interlocking by not gate and OR circuit, go to trigger the bidirectional triode thyristor KS2 conducting in the oil pumping motor machine star angle control loop (6), make the coil of intermediate relay ZJ 2 charged, three normally opened contact adhesives of the intermediate relay ZJ 2 in the motor main circuit (7), bidirectional triode thyristor KS6, KS7, the KS8 conducting that is triggered, change the work wiring of oil pumping motor, make it become star-like wiring.For same motor, the rated power of star-like wiring is 0.578 times of angle-type scheme rated power.After motor changed star into and connects, its rated power promptly was complementary with real work power, has improved the power factor of motor greatly, has saved electric energy in a large number.When oil pumping motor is operated in star and connects, the rated power that if current detection circuit detects the real work power of oil pumping motor when connecing greater than star, the P1.0 pin of single-chip microcomputer just sends the triggering level signal that makes the motor corner connection, after carrying out interlocking by not gate and OR circuit, go to trigger the bidirectional triode thyristor KS1 conducting in the oil pumping motor star angle control loop (6), intermediate relay ZJ 1 coil is got, three normally opened contact adhesives of the intermediate relay ZJ 1 in the motor main circuit (7), bidirectional triode thyristor KS3, KS4, the KS5 conducting that is triggered, change the work wiring of oil pumping motor, make it hand over and be angle-type scheme, improve the rated power of motor, the rated power and the real work power of motor are complementary, avoid the motor overload operation.It more than is this automatic conversion work process in device star angle.

Oil pumping motor in the course of the work; if faults such as short circuit, overcurrent, the phase failure, unsymmetrical currents, single-chip microcomputer can make its P1.0, P1.1 pin level signal be zero, cuts off the working power of oil pumping motor; protect oil pumping motor, removed to show failure condition by the 8255A chip simultaneously.

In the oil pumping motor star angle control loop (6), HK is automatic and and manual control transformation switch.The HK plate is during to automated location, and this device is operated in automatic control state, can make oil pumping motor change its star corner connection line automatically according to the size of real work power, thereby change its rated power, and rated power and real work power are complementary, and reaches purpose of saving.When automatic control is partly broken down, to manual position, oil pumping motor is worked on the HK plate, oil well remains in operation.When the automatic control partial fault disposes, be transformed into normal operation under the automatic control mode again.

Claims

1, a kind of Single-chip Controlling oil pumping motor star angle conversion energy-conserving device, it is characterized in that by single-chip microcomputer (1), data program memory (2), keyboard and display (3), fault shows and star angle display circuit (4), current detection circuit (5), oil pumping motor star angle control circuit (6) and oil pumping motor major loop (7) are formed, the input of single-chip microcomputer (1) and current detection circuit (5) join, the output of single-chip microcomputer (1) and oil pumping motor star angle control circuit (6) join, star angle control circuit (6) is controlled oil pumping motor major loop (7) by auxiliary relay, realize the conversion of oil pumping motor star corner connection line, single-chip microcomputer (1) by data and address bus respectively with data program memory (2), keyboard and display (3), fault shows and star angle display circuit (4) joins.

2, Single-chip Controlling oil pumping motor star according to claim 1 angle conversion energy-conserving device, it is characterized in that oil pumping motor star angle control circuit (6), by not gate and or the interlock circuit formed of door, automatic and manual change-over switch, two bidirectional triode thyristors, two auxiliary relays, a start button and a stop button form, two outputs of interlock circuit extremely link to each other with the control of two bidirectional triode thyristors respectively, the normally-closed contact of two auxiliary relays connects with interlock mode, opens, stops button and be connected in the manual control branch road.

3; Single-chip Controlling oil pumping motor star according to claim 1 angle conversion energy-conserving device; it is characterized in that oil pumping motor major loop (7); by six bidirectional triode thyristors and two auxiliary relays and protection electric capacity; compositions such as current-limiting resistance; wherein there are three bidirectional triode thyristors and oil pumping motor three phase windings to connect into the star-like mode of connection; other three bidirectional triode thyristors and oil pumping motor three phase windings connect into the angle-type scheme mode; three normally opened contacts of one of them auxiliary relay are being controlled the controllable silicon that three stars connect mode, and three normally opened contacts of another one auxiliary relay are being controlled the controllable silicon of three corner connection modes.