CN2208110Y

CN2208110Y - Multi-functional protective controller for beam-pumping unit

Info

Publication number: CN2208110Y
Application number: CN 94229042
Authority: CN
Inventors: 张相文; 周永久
Original assignee: Liaohe Petroleum Exploration Bureau Xinglongtai Oil Production Plant
Current assignee: Liaohe Petroleum Exploration Bureau Xinglongtai Oil Production Plant
Priority date: 1994-06-30
Filing date: 1994-06-30
Publication date: 1995-09-20
Anticipated expiration: 2004-06-30

Abstract

The utility model relates to an integrated multi-functional protective controller for a beam-pumping unit used in an oil pumping well in the oilfield, which is provided with a power capacitor protection. A circuit part comprises a control circuit, a power capacitor fault monitoring protection circuit, a motor phase failure circuit, an overload fault monitoring protection circuit and a beam-pumping unit key parameter monitoring protection circuit. The utility model can be used for avoiding the damage of a power capacitor caused by frequently switching over and mechanical inertia effect after shutdown. The utility model can give an order and protection when phase failure, overload fault and change of key parameter of a motor occur. The utility model can give an order and quit running when the power capacitor fails or the volumetric capacity is decreased to be below a specific technical index. The utility model has the advantages of multiple functions, simple operation, safe operation, etc. The utility model is suitable for extensive use in a beam-pumping well.

Description

Multi-functional protective controller for beam-pumping unit

The utility model relates to a kind of integrated pumping unit multifunctional protection controller that is used for the charged power capacitor protection of oilfield pumping well.

At present, the mode of power capacitor unit local compensation is generally adopted in the compensation of reactive energy in the running of oil extractor in oil field.Because capacitor belongs to the energy switching equipment of inhaling, discharge; and pumping unit belongs to frequent operation and produce equipment than great machinery inertia; thereby excitation resonance potential, the electric current of the genus generating state that the machinery inertial effect produces in the capacitor inrush phenomenon, resonance potential and the stopping process that produce in frequent handoff procedure can cause the fusing of capacitor metallic thin film; insulate impaired puncture and electric control element of dielectric breakdown, motor damages.In addition, power capacitor adopts fus to carry out protections such as overcurrent, short trouble, and protection value error is big, protect untimelyly, thereby trouble duration is long, causes the capacitor damage.And, after capacitor lost efficacy or Capacity detracts, can not monitoredly find, easily cause empty the benefit and the medium power consumption.In addition, present pumping unit controller switching equipment function singleness can not be carried out Monitoring and Controlling to the key parameter outside electric, and its protection part and the separate separately setting of control section, thereby the cost of production height, and easy-maintaining not.

Task of the present utility model provides a kind of integrated pumping unit protection controller of charged power capacitor protection; the infringement that the machinery inertial effect causes after utilizing it can avoid power capacitor because of frequent switching and shutdown; in the motor generation phase failure, overload fault, indicate and protect when the pumping unit key parameter changes; when power capacitor generation overcurrent, short trouble, indicate and protect, when capacitor lost efficacy or the capacity impairment indicate when being lower than the regulation technical order also out of service.

The utility model is to realize like this.This device circuit partly comprises control circuit, the protection of power capacitor malfunction monitoring, the motor phase failure, overload fault monitoring and protecting and pumping unit key parameter monitoring and protecting four parts.Existing division is as follows:

Control circuit part is by the localpower circuit, control circuit and executive circuit are formed when playing machine.Wherein, in the localpower circuit, the elementary phase firewire of start-stop switch S 1 control transformer, rectification stable pressuring unit is supplied with localpower.Control circuit comprises that motor plays machine time control indicating member and capacitor plays machine time control unit during the machine of rising, motor rises in the machine time control indicating member, play one pair of switch S 2-1, one termination capacitor device C1 "+" end of machine form selector switch S2, C1 "-" termination power "-" end, another termination potentiometer of S2-1 R17 one end, another termination power "+" end of R17,555 ₁The time matrix input end 2,6 pin connect the serial connection point of R17 and S2-1, output terminal 3 pin connect "+" end of the machine light indication diode H1 that delayed time through resistance R 19, "-" termination power "-" end of H1, AND NOT gate element F7 imports termination 555 ₁3 pin, the input end of F7 output termination and gating element F4; Capacitor rises in the machine time control unit, "+" end of one pair of normal termination capacitor device C5 of making war of relay K 1, the other end connecting resistance R24 one end, "-" termination power "-" end of C5, another termination power "+" end of R24,555 ₂The time matrix input end 2,6 pin connect "+" end of C5, the input end of output termination AND NOT gate F8, the input end of the output termination of F8 and door F5.Comprise motor Monitoring and Controlling, pumping unit key parameter Monitoring and Controlling performance element and capacitor Monitoring and Controlling performance element in the executive circuit, in motor Monitoring and Controlling, the pumping unit key parameter Monitoring and Controlling performance element, the base stage of triode A1 by resistance R 20 connect with the door F4 input end, the also contact of the collector connecting relay K1 coil of A1 and diode V4 "+" end, the coil K1 the other end and V1 "-" hold and connect power supply "+" end, emitter connects power supply "-" end, one pair of switch of S2-2, one termination A1 emitter among the S2, another termination A1 collector electrode; In the capacitor Monitoring and Controlling performance element, the base stage of triode A2 by resistance R 21 connect with the door F5 output terminal, the also contact of collector connecting relay K2 coil and diode V5 "+" end, power supply "+" end is held and connect in "-" of the coil K2 the other end and V5, and emitter connects power supply "-" end.

Power capacitor malfunction monitoring protection part is made up of sampling, benchmark, comparison operation circuit and signal processing, indicating circuit.Wherein, sampling, benchmark, in the comparison operation circuit, sensor CTA, CTB one end also connects power supply "-" end, the other end respectively with rectifier cell V6, V7 "+" end links, V6, V7 "-" end is held with capacitor C 6 "+" respectively, resistance R 28 1 ends and capacitor C 7 "+" end, resistance R 27 1 ends link, C6, "-" end and the potentiometer R29 of C7, R30 one end also connects power supply "-" end, R28, R29 and R27, the R30 the other end meets operational amplifier N4 and N5 respectively, the signal voltage input end of N6 and N7, resistance R 31 and R34 one end also connect power supply "+" end, the other end respectively with resistance R 32, R33 one end serial connection, R32, the R33 the other end also connects power supply "-" end, N4 and N6 reference voltage input connect the serial connection point of R34 and R33, and the reference voltage input of N5 and N7 connects the serial connection point of R31 and R32.In signal processing, the indicating circuit, connect the output terminal of N4, N5, N6, N7 respectively with 4 input ends of door F6, the end of the output terminal connecting resistance R26 of F6, "-" end of another termination capacitor C 4 of R26 and the R input end of trigger RS4, "+" termination power "+" end of C4, e point in the S input end connection circuit of RS4, RS4's Output terminal is held by "-" that resistance R 22 meets capacitance operation tutorial light H7, and "+" that meet fault indicating lamp H6 by resistance R 23 holds, "+" termination power "+" end of H7, "-" termination power "-" end of H6; The Q output termination of RS4 and the input end of door F5.

Electrical fault monitoring and protecting part is made up of sampling, benchmark, comparison operation circuit and signal processing, indicating circuit.Wherein, sampling, benchmark, in the comparison operation circuit, sensor MTC2, MTC1, MTB1 one end also connects power supply "-" end, the MTC2 the other end and MTB2, MTA is connected in series successively, MTA, MTB1, the MTC1 the other end meets diode V1 respectively, V2, V3 "+" end, V1, V2, V3 "-" end is connecting resistance R2 respectively, R4, R6 one end, R2, R4, the R6 the other end respectively with resistance R 1, R3, R5 one end serial connection, R1, R3, the R5 the other end also connects power supply "-" end, operational amplifier N1, N2, three sampling voltage input ends of N3 meet R6 and R5 respectively, R4 and R3, the serial connection point of R2 and R1, resistance R 10 and resistance R 7 one ends also connect power supply "+" end, the other end respectively with potentiometer R9, resistance R 8 one ends serial connection, the R9 and the R8 the other end also connect power supply "-" end, N1, the N2 reference voltage input connects the serial connection point of R10 and R9, and the reference voltage input of N3 connects the serial connection point of R7 and R8.In the signal processing indicating circuit, 2 input ends of AND NOT gate F2 connect 2 output terminals of N1, N2 respectively, the output terminal of another input termination AND NOT gate F3 of F2, and the output terminal of the input termination N3 of F3, another input end connects trigger RS1's

Output terminal, e point in the S input end connection circuit of RS1, the output terminal of the R input termination N3 of RS1, the input end of the output termination AND NOT gate F1 of F2, the output terminal of F1 connects "-" end of capacitor C2 and the R input end of trigger RS2 by potentiometer R11, "+" termination power "+" end of C2, the serial connection point e of S input end connecting resistance R12 one end of RS2 and capacitor C3 "+" end, another termination power "+" end of R12, "-" end of "-" termination power of C4, RS2's

Output terminal connects "-" end of motor run indicator H2 by resistance R 16, connect "+" end of fault indicating lamp H3 by resistance R 15, "+" termination power "+" end of H2, "-" termination power "-" end of H3, the Q output termination of RS2 and the input end of gating element F4.

Pumping unit key parameter monitoring and protecting part is made up of signal processing, indicating circuit.Wherein, e point in the S input end connection circuit of trigger RS3, normal battle of SQ one end of R input termination external sensor SQ, another termination power "+" end of SQ, also can directly connect SQ high level signal output terminal, the Q output terminal of RS3 is held by "+" that resistance R 13 meets operation light emitting diode H4, connects "-" end of fault indicating lamp H5 by resistance R 14, "-" end of H4 and "+" end of H5 then connect "-" end and "+" end of power supply respectively, the input end of Q output termination F4.

Fig. 1 is an electrical schematic diagram of the present utility model.

Fig. 2 is motor, capacitor control electrical schematic diagram.

As follows below in conjunction with accompanying drawing to various function implementation procedures of the present utility model (being its working principle) division:

Manually, automatically play machine and pumping unit frequent operation and shut down the protection of inertial force harm electric capacity: the start stop switch S1 that closes will open machine form selector switch S2-1 and place manual position, this moment 555 ₁The time matrix input end 2,6 pin be high level, output terminal 3 pin output low levels are oppositely exported high level in the back through AND NOT gate F7, with door F4 output high level, triode A1 conducting work, relay K 1 has electric adhesive, its normally opened contact K1 closure is connected motor operation contactor K3, pumping unit work; Connect capacitor C5, resistance R 24 is charged to C5, when C5 voltage rises to 5V after 60 minutes, and trigger 555 ₂The output terminal 3 pin output low level of overturning immediately through the reverse back output high level of AND NOT gate F8, is exported high level with door F5, triode A2 conducting work, relay K 2 has electric adhesive, its normally opened contact K2 closure, connect power capacitor operation contactor K4, power capacitor work.Meanwhile, the R input end input high level of trigger RS2, RS4, S input end power on and keep high level after resistance R 12 is charged to capacitor C3 blink, and Q output terminal output high level guarantees A1, the work of A2 normally,

The output terminal output low level, H7 is bright for motor run indicator H2, capacitance operation tutorial light.S2-1 is placed automated location, and after motor grid power blackout in service restored electricity again, power supply charged to capacitor C1 by potentiometer, and 555 ₁The time matrix 2,6 pin input low levels, 3 pin output high level, H1 is bright for the machine tutorial light of delay time, after the RC time constant that reaches pre-setting, C1 powers on when pressing liter greater than 5V, 555 ₁Export the 3 pin output low level of overturning immediately, H1 goes out, and repeats above-mentioned manual machine process, pumping unit, power capacitor work.If monitored, object of protection breaks down, but the short time can continue to move, then the S2-2 switch is placed protection to withdraw from the position, this moment A2 emitter and collector short circuit, relay K 1 on-line operation, system puts into operation.

Capacitor malfunction monitoring protection: power capacitor running current signal is made the signal voltage that guarantees the normal operation of power capacitor through sensor CTA, CTB, rectifier cell V6, V7, resistance R 28, potentiometer R29, resistance R 27, potentiometer R30 conversion and preset, insert the sampling voltage input end of operational amplifier N4 and N5, N6 and N7; With resistance R 31 and R32 series connection dividing potential drop, insert the comparative voltage input end of N5, N7 as overcurrent, short trouble comparison signal; With resistance R 34 and R33 series connection dividing potential drop, as the comparative voltage input end of capacity impairment or the access of failure of removal comparison signal N4, N6.When power capacitor emerged in operation overcurrent, short trouble, when electric current surpasses the maximum current that allows, and condenser failure or capacity impairment, when offset current is lower than the regulation technical order, operational amplifier N4 and N5, N6 and N7 have an output low level at least, with door F6 output low level, delay time nearly 2 seconds through R26, C4 again, if fault can't be eliminated, then trigger RS4 triggers upset

Output terminal output high level, run indicator H7 goes out, and fault indicating lamp H6 is bright, Q output terminal output low level, with door F5 output low level, triode A2 ends relay K 2 dead electricity by conducting work change, its normal battle, K2 opened, operation contactor K4 dead electricity, and power capacitor is out of service.

The motor phase failure, overload fault protection: the voltage signal that the motor operating current signal converts to through sensor MTA, MTB1 and MTB2, MTC1 and MTC2, be converted to VDC through rectifier cell V1, V2, V3, resistance R 2 and R1, R4 and R3, R6 and R5 respectively, this voltage inserts the sampling voltage input end of operational amplifier N1, N2, N3 as sampling voltage, resistance R 7 and R8 serial connection dividing potential drop, its serial connection point inserts the reference voltage input of N3; Resistance R 10 and potentiometer R9 serial connection dividing potential drop, its serial connection point inserts the reference voltage input of N1, N2, and the setting of potentiometer R9 is corresponding with the normal running current value of motor.During motor emerged in operation open phase fault, N3 input end sampling voltage is less than reference potential, and output terminal is exported high level, AND NOT gate element F3 output low level; When overload fault occurring, N1, N2 input end have a sampling voltage at least greater than reference potential, the output terminal output low level, when having one to be low level in three input ends of AND NOT gate element F2, output terminal will be exported high level, AND NOT gate element F1 output terminal after the time-delay of potentiometer R11, capacitor C2 one specified time, output low level, trigger RS2 triggers upset

Output terminal output high level, run indicator H2 goes out, and fault indicating lamp H3 is bright; Q output terminal output low level, with gating element F4 output low level, triode A1 is become by conducting work and ends, relay K 1 dead electricity, its normally opened contact K2 opens, the K3 dead electricity, motor is out of service.

The protection of pumping unit key parameter and control: when key parameters such as the temperature of pumping unit and other relevant device, pressure, vibration, displacement reached the critical value that needs control, SQ was promptly closed relatively, and trigger RS3 triggers upset,

Output terminal output high level, run indicator H5 goes out, and H4 is bright for the parameter tutorial light; Q output terminal output low level, with door F4 output low level, triode A1 is ended by the conducting change, relay K 1 dead electricity, pumping unit is out of service, and whole system is deactivated.

The utility model is reasonable in design, and function is many, and is easy and simple to handle, safe and reliable to operation, utilizes it effectively to protect the work of motor of oil extractor, thereby guarantees the oil well ordinary production, is suitable for and applies.

Claims

1, a kind of pumping unit multifunctional protection controller, comprise the protection of control circuit, power capacitor malfunction monitoring, electrical fault monitoring and protecting and pumping unit key parameter monitoring and protecting four parts, it is characterized in that: the control circuit part is by the localpower circuit, control circuit and executive circuit are formed when playing machine; Power capacitor malfunction monitoring protection part is made up of sampling, benchmark, comparison operation circuit and signal processing, indicating circuit; Electrical fault monitoring and protecting part is made up of sampling, benchmark, comparison operation circuit and signal processing, indicating circuit; Pumping unit key parameter monitoring and protecting part is made up of signal processing, indicating circuit.

2, pumping unit multifunctional protection controller according to claim 1 is characterized in that: in the localpower circuit of control circuit part, and the elementary phase firewire of start-stop switch S 1 control transformer, rectification stable pressuring unit is supplied with localpower; Control circuit comprises that motor plays machine time control indicating member and capacitor plays machine time control unit during the machine of rising, motor rises in the machine time control indicating member, play one pair of switch S 2-1, one termination capacitor device C1 "+" end of machine form selector switch S2, C1 "-" termination power "-" end, another termination potentiometer of S2-1 R17 one end, another termination power "+" of R17,555 ₁The time matrix input end 2.6 pin connect the serial connection point of R17 and S2-1, output terminal 3 pin connect "+" end of the machine light indication diode H1 that delayed time through resistance R 19, "-" termination power "-" end of H1, AND NOT gate element F7 imports termination 555 ₁3 pin, the input end of F7 output termination and gating element F4; Capacitor rises in the machine time control unit, "+" end of one pair of normal termination capacitor device C5 of making war of relay K 1, the other end connecting resistance R24 one end, "-" termination power "-" end of C5, another termination power "+" end of R24,555 ₂The time matrix input end 2,6 pin connect "+" end of C5, the input end of output termination AND NOT gate F8, the input end of the output termination of F8 and door F5; Comprise motor Monitoring and Controlling, pumping unit key parameter Monitoring and Controlling performance element and capacitor Monitoring and Controlling performance element in the executive circuit, in motor Monitoring and Controlling, the pumping unit key parameter Monitoring and Controlling performance element, the base stage of triode A1 by resistance R 20 connect with the door F4 input end, the also contact of the collector connecting relay K1 coil of A1 and diode V4 "+" end, the coil K1 the other end and V1 "-" hold and connect power supply "+" end, emitter connects power supply "-" end, one pair of switch of S2-2, one termination A1 emitter among the S2, another termination A1 collector electrode; In the capacitor Monitoring and Controlling performance element, the base stage of triode A2 by resistance R 21 connect with the door F5 output terminal, the also contact of collector connecting relay K2 coil and diode V5 "+" end, power supply "+" end is held and connect in "-" of the coil K2 the other end and V5, and emitter connects power supply "-" end.

3, pumping unit multifunctional protection controller according to claim 1, it is characterized in that, the sampling of power capacitor malfunction monitoring protection part, benchmark, in the comparison operation circuit, sensor CTA, CTB one end also connects power supply "-" end, the other end respectively with rectifier cell V6, V7 "+" end links, V6, V7 "-" end is held with capacitor C 6 "+" respectively, resistance R 28 1 ends and capacitor C 7 "+" end, resistance R 27 1 ends link, C6, "-" end and the potentiometer R29 of C7, R30 one end also connects power supply "-" end, R28, R29 and R27, the R30 the other end meets operational amplifier N4 and N5 respectively, the signal voltage input end of N6 and N7, resistance R 31 and R34 one end also connect power supply "+" end, the other end respectively with resistance R 32, R33 one end serial connection, R32, the R33 the other end also connects power supply "-" end, N4 and N6 reference voltage input connect the serial connection point of R34 and R33, and the reference voltage input of N5 and N7 connects the serial connection point of R31 and R32; Signal processing, in the indicating circuit, meet N4 respectively with 4 input ends of door F6, N5, N6, the output terminal of N7, the end of the output terminal connecting resistance R26 of F6, "-" end of another termination capacitor C 4 of R26 and the R input end of trigger RS4, "+" termination power "+" end of C4, e point in the S input end connection circuit of RS4, the Q output terminal of RS4 connects "-" end of capacitance operation tutorial light H7 by resistance R 22, connect "+" end of fault indicating lamp H6 by resistance R 23, "+" termination power "+" end of H7, "-" termination power "-" end of H6, the Q output termination of RS4 and the input end of door F5.

4, pumping unit multifunctional protection controller according to claim 1, it is characterized in that, the sampling of electrical fault monitoring and protecting part, benchmark, in the comparison operation circuit, sensor MTC2, MTC1, MTB1 one end also connects power supply "-" end, the MTC2 the other end and MTB2, MTA is connected in series successively, MTA, MTB1, the MTC1 the other end meets diode V1 respectively, V2, V3 "+" end, V1, V2, V3 "-" end is connecting resistance R2 respectively, R4, R6 one end, R2, R4, the R6 the other end respectively with resistance R 1, R3, R5 one end serial connection, R1, R3, the R5 the other end also connects power supply "-" end, operational amplifier N1, N2, three sampling voltage input ends of N3 meet R6 and R5 respectively, R4 and R3, the serial connection point of R2 and R1, resistance R 10 and resistance R 7 one ends also connect power supply "+" end, the other end respectively with potentiometer R9, resistance R 8 one ends serial connection, the R9 and the R8 the other end also connect power supply "-" end, N1, the N2 reference voltage input connects the serial connection point of R10 and R9, and the reference voltage input of N3 connects the serial connection point of R7 and R8; In the signal processing indicating circuit, 2 input ends of AND NOT gate F2 connect 2 output terminals of N1, N2 respectively, the output terminal of another input termination AND NOT gate F3 of F2, and the output terminal of the input termination N3 of F3, another input end connects trigger RS1's

Output terminal, e point in the S input end connection circuit of RS1, the output terminal of the R input termination N3 of RS1, the input end of the output termination AND NOT gate F1 of F2, the output terminal of F1 connects "-" end of capacitor C2 and the R input end of trigger RS2 by potentiometer R11, "+" termination power "+" end of C2, the serial connection point e of S input end connecting resistance R12 one end of RS2 and capacitor C3 "+" end, another termination power "+" end of R12, "-" end of "-" termination power of C4, RS2's Output terminal connects "-" end of motor run indicator H2 by resistance R 16, connect "+" end of fault indicating lamp H3 by resistance R 15, "+" termination power "+" end of H2, "-" termination power "-" end of H3, the Q output termination of RS2 and the input end of gating element F4.

5, pumping unit multifunctional protection controller according to claim 1; it is characterized in that: in the signal processing of the monitoring of pumping unit key parameter, protection part, the indicating circuit; e point in the S input end connection circuit of trigger RS3; normal battle of SQ one end of R input termination external sensor SQ; another termination power "+" end of SQ; also can directly meet SQ high level signal output terminal, RS3's

Output terminal connects "+" end of operation light emitting diode H4 by resistance R 13, connect "-" end of fault indicating lamp H5 by resistance R 14, "-" end of H4 and "+" end of H5 then connect "-" end and "+" end of power supply respectively, the input end of Q output termination F4.