CN209805718U - Detection and protection device of water injection variable frequency motor - Google Patents
Detection and protection device of water injection variable frequency motor Download PDFInfo
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- CN209805718U CN209805718U CN201920695426.1U CN201920695426U CN209805718U CN 209805718 U CN209805718 U CN 209805718U CN 201920695426 U CN201920695426 U CN 201920695426U CN 209805718 U CN209805718 U CN 209805718U
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Abstract
The utility model relates to a detection and protection device of a water injection variable frequency motor, which comprises a water injection motor, a frequency converter, a microcontroller, an analog signal detection circuit, a storage and real-time clock circuit, a communication circuit, a man-machine interaction circuit and an alarm circuit, wherein the frequency converter is connected with the water injection motor; the analog signal detection circuit consists of a current signal sampling circuit, a variable frequency motor temperature detection circuit and a water injection pipe network water pressure acquisition and conditioning circuit, wherein a Hall sensor of the current signal sampling circuit is connected in series at the three-phase input end of the water injection motor in a penetrating manner, a temperature sensor in the variable frequency motor temperature detection circuit is arranged on the water injection motor, and a water pressure sensor in the water injection pipe network water pressure acquisition and conditioning circuit is arranged in a water injection pipe network; the current signal sampling circuit, the variable frequency motor temperature detection circuit and the water injection pipe network water pressure acquisition and conditioning circuit are all connected with the microcontroller, and the frequency converter is connected with the microcontroller through a communication circuit. The utility model discloses can ensure water injection system operation safety and energy saving and consumption reduction.
Description
The technical field is as follows:
The utility model relates to a detect and protection device, concretely relates to water injection inverter motor's detection and protection device.
background art:
The water injection in the oil field production process is a necessary production link, and the oil field water injection plays an active role in improving the crude oil recovery rate and the oil extraction speed and promoting the high yield and stability of the oil field. However, as the development of oil fields enters a new period, and after the development of oil fields with high water content enters a development period, the water injection amount of the oil well is increased rapidly to keep the stable production of the oil fields as the water content of the oil layer is continuously increased, and the power consumption of water injection inevitably increases sharply as the water content of the oil layer is increased. The water injection system of the oil field in China has low efficiency, and the power consumption of the water injection system exceeds more than 35% of the power consumption of the whole oil field. Particularly, in the petrochemical industry, more than 90% of power is consumed by the alternating current motor, and a large amount of technical research and improvement are carried out on energy conservation and consumption reduction of water injection systems in various domestic oil fields. At present, in order to save energy, reduce consumption and reduce production cost, a domestic oil field water injection pump station generally adopts a high-pressure variable-frequency speed regulation device to control water injection quantity and pressure. In the oil field oil extraction and water injection production link, the frequency conversion water injection motor can work in a very severe environment, and the water injection motor always works at high power, full load and long time, so that the probability of various faults is higher than that of the motor working in the general environment by a plurality of degrees. However, it is not practical to continue using conventional motor protection devices at the site of oilfield flooding. The traditional variable frequency motor protection device is low in protection precision and large in action time error. The water injection task in the oil field water injection system is heavy, and high-pressure and high-power equipment is used. The problem of how to ensure the safe and efficient operation of the variable frequency motor provides a new subject for enterprises carrying out high-voltage variable frequency speed regulation transformation technology. According to incomplete statistics, about 2 thousands of motors which are burnt out every year in the production activities of various oil fields and petrochemical enterprises in China are burnt out, and economic losses are disastrous. The motor fault causes serious economic loss if the motor fault is light, and threatens the personal safety of workers if the motor fault is heavy. Therefore, the detection and protection research work of the high-voltage variable frequency motor in the variable frequency operation mode has important significance for ensuring the operation safety of the oil field water injection system, saving energy, reducing consumption and improving production efficiency and economic benefit.
The invention content is as follows:
The utility model aims at providing a water injection inverter motor's detection and protection device, this kind of water injection inverter motor's detection and protection device are used for solving the problem of ensureing inverter motor safe high-efficient operation.
The utility model provides a technical scheme that its technical problem adopted is: the detection and protection device of the water injection variable frequency motor comprises a water injection motor, a frequency converter, a microcontroller PIC16F877A, an analog signal detection circuit, a storage and real-time clock circuit, a communication circuit, a man-machine interaction circuit and an alarm circuit, wherein the frequency converter is connected with the water injection motor; the analog signal detection circuit consists of a current signal sampling circuit, a variable frequency motor temperature detection circuit and a water injection pipe network water pressure acquisition and conditioning circuit, wherein the current signal sampling circuit is provided with a Hall sensor, the Hall sensor is connected in series with the three-phase input end of the water injection motor in a penetrating manner, the temperature sensor in the variable frequency motor temperature detection circuit is arranged on the water injection motor, and the water pressure sensor in the water injection pipe network water pressure acquisition and conditioning circuit is arranged in the water injection pipe network; the current signal sampling circuit, the variable frequency motor temperature detection circuit and the water injection pipe network water pressure acquisition and conditioning circuit are all connected with a microcontroller PIC16F877A, the frequency converter is connected with the microcontroller PIC16F877A through a communication circuit, and the storage and real-time clock circuit, the man-machine interaction circuit and the alarm circuit are all connected with the microcontroller PIC16F 877A; the man-machine interaction circuit comprises a keyboard circuit, a liquid crystal display circuit and a fault alarm circuit.
In the above-described aspect, the current signal sampling circuit is configured to: the water injection motor comprises a Hall sensor, a voltage follower circuit, a low-pass filter, an A/D conversion port of a microcontroller, a resistor R1 and a resistor C1, wherein the Hall sensor is connected with the voltage follower circuit in series in a penetrating mode and connected with the three-phase input end of the water injection motor, the Hall sensor converts three-phase current of the water injection motor into proportional 0-5V voltage signals, the voltage signals pass through the voltage follower circuit with high input impedance, the voltage follower circuit enhances driving capability and then enters the A/D conversion port of the microcontroller after low-pass filtering, the resistors R1 and C1 form a low-pass filter, diodes D1 and D2 play a role in voltage clamping and protect an A/D module of the microcontroller, when the V2 voltage is negative voltage, the D2 is conducted, the V2 voltage is clamped at 0V, when the V2 voltage is higher than 5V, the D1 is conducted, and the V2 voltage.
In the scheme, the temperature sensor adopts an WZP type Pt100 temperature sensor, the water pressure sensor adopts a PT500-20M-DC5V-0.5-M20-8M-503 water pressure sensor, and the storage and real-time clock circuit adopts 512 multiplied by 8 bit AT24C04 as a memory; PCF8583 is used as the system clock.
In the scheme, the communication circuit adopts MAX485 as a communication interface chip.
In the scheme, the liquid crystal display circuit adopts NH12864M type LCM.
the utility model discloses following beneficial effect has:
1. The utility model discloses to the sampling and the digitization of the powerful inverter motor's of high pressure electric current, motor temperature, water injection pipe network water pressure isoparametric, realize online diagnosis, detection and the control of inverter motor trouble, to ensureing that water injection system operation safety and energy saving and consumption reduction, improvement production efficiency and economic benefits all have the significance.
2. The utility model discloses have inverter motor operating current, winding temperature, water injection pipe network water pressure isoparametric time digital display function, can show these parameters in real time in the operation, make things convenient for getting rid of trouble.
3. The utility model discloses a man-machine dialogue module carries out parameter setting, and the parameter of fault record is deposited in singlechip built-in nonvolatile memoryThe anti-seismic device is safe and reliable, has anti-seismic performance due to power failure prevention, has extremely high stability, and is simple in design, low in cost and easy to operate.
Drawings
FIG. 1 is a schematic block diagram of a hardware circuit of a water injection variable frequency motor detection and protection system.
FIG. 2 is a PDIP-40 package diagram of PIC16F 877A.
Fig. 3 is a circuit diagram of the current signal sampling circuit of the present invention.
Fig. 4 is the utility model discloses well inverter motor temperature-detecting circuit diagram.
fig. 5 is a circuit diagram of water pressure collection and conditioning of the water injection pipe network of the present invention.
Figure 6 is the storage and real time clock circuit of the present invention.
Fig. 7 is a communication circuit of the present invention.
Fig. 8 is a man-machine interaction circuit of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings:
With reference to fig. 1 and 2, the detection and protection device for the water injection variable frequency motor comprises a water injection motor, a frequency converter, a microcontroller PIC16F877A, an analog signal detection circuit, a storage and real-time clock circuit, a communication circuit, a man-machine interaction circuit and an alarm circuit, wherein the frequency converter is connected with the water injection motor; the analog signal detection circuit consists of a current signal sampling circuit, a variable frequency motor temperature detection circuit and a water injection pipe network water pressure acquisition and conditioning circuit, wherein the current signal sampling circuit is provided with a Hall sensor, the Hall sensor is connected in series with the three-phase input end of the water injection motor in a penetrating manner, the temperature sensor in the variable frequency motor temperature detection circuit is arranged on the water injection motor, and the water pressure sensor in the water injection pipe network water pressure acquisition and conditioning circuit is arranged in the water injection pipe network; the current signal sampling circuit, the variable frequency motor temperature detection circuit and the water injection pipe network water pressure acquisition and conditioning circuit are all connected with a microcontroller PIC16F877A, the frequency converter is connected with the microcontroller PIC16F877A through a communication circuit, and the storage and real-time clock circuit, the man-machine interaction circuit and the alarm circuit are all connected with the microcontroller PIC16F 877A; the man-machine interaction circuit comprises a keyboard circuit, a liquid crystal display circuit and a fault alarm circuit.
The microcontroller PIC16F877A is used as a core component, an analog-digital converter in the PIC16F877A is used for sampling and digitizing parameters such as phase current of a high-voltage high-power variable-frequency motor, motor winding temperature, water pressure of a water injection pipe network and the like, and when symmetric faults such as overload, locked rotor, three-phase short circuit, motor over-temperature and the like and asymmetric faults such as phase failure, interphase short circuit, grounding and the like occur, the microcontroller controls a buzzer to give an alarm, displays and stores fault information, and therefore protection of the variable-frequency motor is reliably and effectively implemented according to different fault properties.
1. A microcontroller.
The microcontroller module is the core of the motor detection and protector and is mainly responsible for the core control tasks of acquisition, A/D conversion, data processing, data storage, alarm display, communication with a frequency converter and the like of various signals for measuring whether the motor works normally.
The utility model adopts a PIC16F877A single chip microcomputer with higher cost performance. Some of the pins are described as follows:
①the reset input, programmable voltage input or high voltage test mode control pin, when used as a reset input, is an Active Low action.
OSC1/CLKI oscillator input/external clock source input pin. OSC2/CLKO an oscillation output pin that should be connected to an external crystal/crystal oscillator in oscillation mode and that outputs a clock signal CLKOUT divided by four at the frequency of OSC1 in RC mode.
VSSA power ground pin; vDD: a power input pin.
RA0 ~ RA3, RA5, RE0 ~ RA3 are 8 mode input channels of PIC16F877A singlechip built-in A \ D converter, the utility model discloses use these 8 pins as the input channel of motor end three-phase current, motor stator winding temperature, water injection pipe network pressure signal, RA4 is as the warning circuit output pin of this system.
RB0 ~ RB3 is used as key input pins of the system, and RB4 ~ RB7, RC0 ~ RC1 and RD0 ~ RD7 are used for connecting the liquid crystal display.
Sixthly, the RC3, the RC6 and the RC7 are control pins for RS485 communication transmission/connection; RC4 and RC5 are read-write control pins of an external clock circuit and a storage circuit.
2. an analog signal detection circuit.
The analog signal acquisition circuit is used for acquiring working state signals of the motor, and comprises a sampling and conditioning circuit (see figure 5) for signals such as motor phase current, motor stator winding temperature, water pressure of a water injection pipe network and the like.
Referring to fig. 3, the current signal sampling circuit is formed by connecting a hall sensor in series at the input end of three phases of the motor in a penetrating manner, the hall current sensor converts the actual three-phase current of the motor into a proportional 0-5V voltage signal, the voltage signal passes through a voltage follower circuit with high input impedance, the driving capability is enhanced, and the voltage signal enters an a/D conversion port of the micro-controller after low-pass filtering. The resistors R1 and C1 form a low-pass filter, the diodes D1 and D2 play a role in voltage clamping, an A/D module of the microcontroller is protected, D2 is conducted when the voltage of V2 is negative voltage, the voltage at V2 is clamped at 0V, when the voltage of V2 is higher than 5V, D1 is conducted, and the voltage at V2 is clamped at 5V.
Referring to fig. 4, in the temperature detection circuit of the variable frequency motor, in order to reduce the nonlinear characteristic that the resistance value of the Pt100 platinum resistor changes with the temperature and improve the temperature measurement accuracy, the nonlinear compensation of the low temperature constant current source is adopted, and the voltage output and the resistance present an ideal linear relationship by the constant current source driving and the signal conditioning.
3. Memory and clock circuits.
Referring to fig. 6, the storage circuit is used to store fault history information at a certain depth and save system parameters (such as rated voltage, rated current, etc.), protection parameters, etc.; the clock circuit is mainly used for recording the time when a certain fault occurs, the running time of the motor and the like, and provides scientific reference for the regular maintenance of the equipment. Selecting a compound having I2The AT24C04 with 512 x 8 bits of the C interface serves as memory. Is selected to be also I2PCF8583 of the C interface is used as a system clock, and the clock circuit has the characteristics of simple peripheral circuit, low power consumption and the like; meanwhile, in order to ensure the real-time performance and the continuity of the system work when the clock circuit is powered down, a trickle charging loop of 3.6V/60mAh direct current charging is specially designed to be used as a backup power supply of the clock circuit.
4. A communication circuit.
The microcontroller is in serial communication with the RS-485 bus of the frequency converter, and the microcontroller controls the high-voltage frequency converter, includingThe frequency converter performs the operations of parameter setting, frequency setting, starting, stopping and the like. Microcontroller and converter interface circuit. The utility model discloses use DHCECTOL-DI series high-voltage high-power converter, this converter has RS485 bus communication interface. Therefore, the water injection variable frequency motor detection and protection system adopts MAX485 as a communication interface chip (refer to fig. 7), and selects a twisted pair as a signal transmission line to realize the communication between the microcontroller and the frequency converter. 6N137 is used for electric isolation, interference prevention and communication speed and quality improvement. The RC6 is a data receiving end of USART, the RC7 port is a data transmitting end of USART, and the RC5 port is a control end. If RC5 outputs low, pins 2 and 3 of MAX485 are low,The single chip microcomputer receives data effectively; if RC5 outputs high level, 2 and 3 pins of MAX485 are high level, DE is effective, and the single chip microcomputer sends data. The interface circuit design fully considers various interferences of an electronic circuit and matching of circuit characteristic impedance, an absorption loop formed by two voltage-stabilizing tubes is used for protecting a transmission end, and a 120 ohm resistor is added at the tail end of a transmission line of the system for impedance matching so as to inhibit long line reflection and absorb noise.
5. And a man-machine interaction circuit.
Referring to fig. 8, the human-computer interaction circuit includes a keyboard circuit, a liquid crystal display circuit, and a malfunction alarm circuit. The man-machine interaction circuit can be used for setting values of parameters such as motor phase current, motor temperature and water pressure of a water injection pipe network, checking each electric parameter data and the working state of the motor, and allowing a worker to completely control the frequency converter from a panel, wherein the operations comprise parameter setting, starting, stopping and the like; the liquid crystal display circuit displays information such as set values, modified values, real-time values and fault states of all parameters according to key selection, and therefore interaction between field workers and the protection device is facilitated. The fault alarm circuit plays a role in alarming and prompting when a fault occurs.
The current signal sampling circuit adopts a WBI222LY05-25 Hall sensor; the temperature detection circuit of the variable frequency motor adopts an WZP type Pt100 temperature sensor; the water pressure sensor selects PT500-20M-DC 5V-0.5-M20-8M-503. Liquid crystal display module NH12864M model LCM.
the utility model discloses to ensureing that water injection system operation safety and energy saving and consumption reduction, improvement production efficiency and economic benefits all have the significance, reasonable in design, the practicality is strong, has good spreading value, and the small investment, it is fast to take effect, will bring good economic benefits and social for production.
Claims (5)
1. The utility model provides a water injection inverter motor's detection and protection device which characterized in that: the detection and protection device of the water injection variable frequency motor comprises a water injection motor, a frequency converter, a microcontroller PIC16F877A, an analog signal detection circuit, a storage and real-time clock circuit, a communication circuit, a man-machine interaction circuit and an alarm circuit, wherein the frequency converter is connected with the water injection motor; the analog signal detection circuit consists of a current signal sampling circuit, a variable frequency motor temperature detection circuit and a water injection pipe network water pressure acquisition and conditioning circuit, wherein the current signal sampling circuit is provided with a Hall sensor, the Hall sensor is connected in series with the three-phase input end of the water injection motor in a penetrating manner, the temperature sensor in the variable frequency motor temperature detection circuit is arranged on the water injection motor, and the water pressure sensor in the water injection pipe network water pressure acquisition and conditioning circuit is arranged in the water injection pipe network; the current signal sampling circuit, the variable frequency motor temperature detection circuit and the water injection pipe network water pressure acquisition and conditioning circuit are all connected with a microcontroller PIC16F877A, the frequency converter is connected with the microcontroller PIC16F877A through a communication circuit, and the storage and real-time clock circuit, the man-machine interaction circuit and the alarm circuit are all connected with the microcontroller PIC16F 877A; the man-machine interaction circuit comprises a keyboard circuit, a liquid crystal display circuit and a fault alarm circuit.
2. The detection and protection device of the water injection variable frequency motor as claimed in claim 1, wherein: the current signal sampling circuit is configured to: the Hall sensor is connected with a voltage following circuit which is connected with a low-pass filter, and the low-pass filter is connected with an A/D conversion port of the microcontroller.
3. The detection and protection device of the water injection variable frequency motor as claimed in claim 2, wherein: the temperature sensor adopts an WZP type Pt100 temperature sensor, the water pressure sensor adopts a PT500-20M-DC5V-0.5-M20-8M-503 water pressure sensor, and the storage and real-time clock circuit adopts 512 multiplied by 8 bit AT24C04 as a memory; PCF8583 is used as the system clock.
4. The detection and protection device of the water injection variable frequency motor as claimed in claim 3, wherein: the communication circuit adopts MAX485 as a communication interface chip.
5. The detection and protection device of the water injection variable frequency motor as claimed in claim 4, wherein: the liquid crystal display circuit adopts NH12864M type LCM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920695426.1U CN209805718U (en) | 2019-05-10 | 2019-05-10 | Detection and protection device of water injection variable frequency motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920695426.1U CN209805718U (en) | 2019-05-10 | 2019-05-10 | Detection and protection device of water injection variable frequency motor |
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| CN209805718U true CN209805718U (en) | 2019-12-17 |
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| CN201920695426.1U Expired - Fee Related CN209805718U (en) | 2019-05-10 | 2019-05-10 | Detection and protection device of water injection variable frequency motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111208852A (en) * | 2020-02-28 | 2020-05-29 | 安徽物迅科技有限公司 | Digital watering valve system |
-
2019
- 2019-05-10 CN CN201920695426.1U patent/CN209805718U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111208852A (en) * | 2020-02-28 | 2020-05-29 | 安徽物迅科技有限公司 | Digital watering valve system |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191217 Termination date: 20210510 |
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| CF01 | Termination of patent right due to non-payment of annual fee |