CN112858854A - Passive composite ultrasonic partial discharge sensor and monitoring system - Google Patents
Passive composite ultrasonic partial discharge sensor and monitoring system Download PDFInfo
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- CN112858854A CN112858854A CN202110176268.0A CN202110176268A CN112858854A CN 112858854 A CN112858854 A CN 112858854A CN 202110176268 A CN202110176268 A CN 202110176268A CN 112858854 A CN112858854 A CN 112858854A
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- 238000012360 testing method Methods 0.000 claims description 8
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0096—Radiation pyrometry, e.g. infrared or optical thermometry for measuring wires, electrical contacts or electronic systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
Abstract
The invention provides a passive composite ultrasonic partial discharge sensor and a monitoring system, which are arranged on equipment to be tested in a high-voltage transmission line network; the ultrasonic partial discharge acquisition module is connected with the MCU control module; the induction closed coil is electrically connected with the power transmission line and used for inducing an electromagnetic change signal generated by the current of the high-voltage power transmission line; one end of the power supply module is electrically connected with the induction closed coil, and the other end of the power supply module is electrically connected with the MCU control module and used for supplying power to the MCU control module; the ultrasonic partial discharge acquisition module is used for generating a first voltage signal and sending the first voltage signal to the MCU control module when the equipment to be tested has a partial discharge phenomenon, so that the MCU control module sends the first voltage signal to the background monitoring system, and the background monitoring system diagnoses the partial discharge phenomenon of the equipment to be tested according to the first voltage signal. The invention has the characteristics of small volume, convenient power taking and the like.
Description
Technical Field
The invention relates to an ultrasonic partial discharge sensor, in particular to a passive composite ultrasonic partial discharge sensor and a monitoring system.
Background
At present, there are various methods for detecting a partial discharge phenomenon of a device, such as a pulse current method, a TEV method, a UHF method, an ultrasonic method, a light detection method, an infrared measurement method, and the like, wherein the UHF method and the ultrasonic method are suitable for on-line detection. The ultrasonic method is not electrically connected with the equipment to be tested and is not interfered by the electromagnetic interference generated by a transformer substation, so that the ultrasonic method is commonly used for detecting the partial discharge phenomenon of the equipment. However, in the existing ultrasonic detection method, an active battery is used for supplying power, a battery space is usually required to be reserved in detection equipment for installing a battery, and since the detected equipment is generally equipment in the field such as a power transmission line, an insulator and the like in a high-voltage power transmission line network, when the battery is dead, a maintainer is required to take down the detection equipment to replace the battery, so that the maintenance cost is increased; meanwhile, because the detection equipment needs to reserve the battery space, the volume of the detection equipment is large, and the detection equipment is inconvenient to install. Meanwhile, the volume of the device is large, so that the device is difficult to be applied to partial discharge detection of high-low voltage equipment, such as equipment with small space, such as a switch cabinet, a bus, a circuit breaker, a power transmission line terminal and the like.
Disclosure of Invention
In order to overcome the disadvantages of the prior art, an object of the present invention is to provide a passive composite ultrasonic sensor, which can solve the problems of the prior art, such as a large number of parts, high maintenance cost, and large volume of a partial discharge phenomenon diagnosis device.
The second objective of the present invention is to provide a monitoring system for a passive composite ultrasonic sensor, which can solve the problems of the prior art, such as many parts, high maintenance cost, large volume, etc., of the partial discharge diagnostic equipment.
One of the purposes of the invention is realized by adopting the following technical scheme:
a passive composite ultrasonic partial discharge sensor is arranged on equipment to be tested in a high-voltage transmission line network; the passive composite ultrasonic partial discharge sensor comprises a power module, an ultrasonic partial discharge acquisition module, an induction closed coil and an MCU (microprogrammed control unit) control module; the induction closed coil is electrically connected with a transmission line in the high-voltage transmission line network and used for inducing an electromagnetic change signal generated by the current of the high-voltage transmission line; one end of the power supply module is electrically connected with the induction closed coil, and the other end of the power supply module is electrically connected with the MCU control module and used for generating a power supply signal according to electromagnetic change and providing a power supply for the MCU control module; the ultrasonic wave partial discharge acquisition module is electrically connected with the MCU control module and used for generating a first voltage signal and sending the first voltage signal to the MCU control module when the equipment to be tested has a partial discharge phenomenon, so that the MCU control module sends the first voltage signal to the background monitoring system, and the background monitoring system diagnoses the partial discharge phenomenon of the equipment to be tested according to the first voltage signal.
Further, the passive composite ultrasonic partial discharge sensor comprises an equipment shell and a silicon rubber binding band; one end of the silicon rubber binding band is fixedly connected with one side of the equipment shell, the other end of the silicon rubber binding band is movably connected with the other side of the equipment shell, and the equipment shell is bound on the equipment to be tested through the silicon rubber binding band and is in direct contact with the equipment to be tested; the power module, the ultrasonic partial discharge acquisition module and the MCU control module are all arranged inside the equipment shell.
Further, the power module comprises a CT power taking module and a voltage stabilizing module; the input end of the CT power taking module is electrically connected with the induction closed coil, and the output end of the CT power taking module is electrically connected with the MCU control module through the voltage stabilizing module; and the CT power taking module is used for forming a second voltage signal according to the electromagnetic change signal induced by the induction closed coil and stabilizing the second voltage signal through the voltage stabilizing module to form the power supply signal.
Further, the power supply module comprises a connection terminal A, a connection terminal K, a ground terminal GND, a capacitor CX1, a capacitor CV1, a diode D1, a diode D3, an energy storage capacitor EC2, a voltage regulator tube D4 and a resistor R7; the connecting terminal A and the connecting terminal K are respectively electrically connected with two ends of the induction closed coil, and a second voltage signal is formed between the connecting terminal A and the connecting terminal K through the induction closed coil; the capacitor CX1, the capacitor CV1, the diode D1 and the diode D3 form a full-wave rectifying circuit, and the full-wave rectifying circuit is electrically connected with the anode of the energy storage capacitor EC2 and is used for rectifying the second voltage signal and storing energy through the energy storage capacitor EC 2; the ground terminal GND is grounded; the energy storage capacitor EC2 outputs a power supply VCC outwards through a resistor R7; the negative electrode of the energy storage capacitor EC2 is grounded; resistor R7 is also connected to ground through a voltage regulator D4.
Further, the ultrasonic partial discharge acquisition module comprises an MEMS microphone U1, a pre-amplification circuit and a post-amplification circuit; the preamplifier circuit comprises a capacitor C1, an operational amplifier U3, a capacitor C3, a resistor R1, a resistor R30, a resistor R17 and a resistor R24; the post-stage amplifying circuit comprises an operational amplifier U8, a capacitor C2, a capacitor C4, a capacitor C5, a capacitor C28, a resistor R20, a resistor R26, a resistor R28, a resistor R29, a resistor R30 and a resistor R31;
the grounding end GND and the drain output end OUT of the MEMS microphone U1 are sequentially connected with the negative input end of the operational amplifier U3 through the capacitor C1 and the resistor R24, the power supply end VDD is electrically connected with the MCU control module, and the power supply end VDD is further grounded through the capacitor C34;
the positive input end of the operational amplifier U3 is electrically connected with the MCU control module through a resistor R1 and is grounded through a resistor R30; the power supply anode of the operational amplifier U3 is grounded through a capacitor C3 and is electrically connected with the MCU control module; the negative power supply of the operational amplifier U3 is grounded;
the output end OUT of the operational amplifier U3 is electrically connected with the negative input end of the operational amplifier U8 sequentially through the capacitor C2, the resistor R26 and the capacitor C5; the positive input end of the operational amplifier U8 is electrically connected with the MCU control module through a resistor R28 and is grounded through a resistor R31; the power supply anode of the operational amplifier U8 is grounded through a capacitor C4 and is electrically connected with the MCU control module; the output end OUT of the operational amplifier U8 is electrically connected with the MCU control module, is connected between the capacitor C5 and the negative input end of the operational amplifier U8 through a resistor R20, and is connected between the resistor R26 and the capacitor C5 through a capacitor C28; the capacitor C28 is also grounded through a resistor R30; the MEMS microphone U1 is configured to generate a first voltage signal according to an external ultrasonic signal, amplify the first voltage signal by a pre-stage amplification circuit and a post-stage amplification circuit, and output the amplified first voltage signal to the MCU control module through an output terminal OUT of the transport amplifier U8.
Further, the MCU control module comprises a chip U5; the port 9 of the chip U5 is electrically connected to the VDD terminal of the MEMS microphone U1, the positive input terminal of the operational amplifier U3 through the resistor R1, and the positive input terminal of the operational amplifier U8 through the resistor R28, respectively; the MCU control module controls the working states of the MEMS microphone U1, the operational amplifier U3 and the operational amplifier U8 through a port 9 of a chip U5, starts the work of the ultrasonic partial discharge acquisition module and controls the ultrasonic partial discharge acquisition module to acquire a first voltage signal; the port 11 of the chip U5 is electrically connected to the output end OUT of the operational amplifier U8 of the ultrasonic partial discharge acquisition module, and is configured to obtain a first voltage signal acquired by the ultrasonic partial discharge acquisition module.
Furthermore, the passive composite ultrasonic partial discharge sensor comprises an equipment temperature acquisition module, wherein the equipment temperature acquisition module is electrically connected with the MCU control module and is used for detecting the temperature of the equipment to be detected and sending a generated temperature signal to the MCU control module, so that the MCU control module sends the temperature signal to the background control system; the MCU control module is also used for controlling the ultrasonic partial discharge acquisition module to start and receiving a first voltage signal sent by the ultrasonic partial discharge acquisition module when the temperature of the equipment to be detected is judged to be greater than a threshold value according to the temperature signal; the equipment temperature acquisition module is an infrared temperature measuring device or a contact temperature measuring device.
Further, the passive composite ultrasonic partial discharge sensor comprises a communication module, and the MCU control module is in communication connection with the background control system through the communication module; the communication module is a wireless transmission module, and the wireless transmission module comprises a chip U10 and an antenna ANT; the port 22 of the chip U10 is electrically connected with an antenna ANT through an inductor L2, and data acquired by the MCU control module are transmitted to a background control system through a 2.4G frequency band; the ports 16, 17, 18, 19, 8, 7 and 3 of the chip U10 are electrically connected with the ports 19, 20, 18, 21, 29, 30 and 6 of the chip U5 of the MCU control module, respectively.
Further, when the background control system detects that the local discharge phenomenon exists in the device to be tested, a control instruction is sent to the MCU control module, so that the MCU control module sets the acquisition frequency of the ultrasonic wave local discharge acquisition module according to the control instruction.
The second purpose of the invention is realized by adopting the following technical scheme:
a monitoring system of a passive composite ultrasonic partial discharge sensor comprises a background control system and one or more passive composite ultrasonic partial discharge sensors adopted according to one of the purposes of the invention; each passive composite ultrasonic partial discharge sensor is installed on the corresponding device to be tested and used for sending the acquired voltage signal and/or temperature signal to the background monitoring system, so that the background monitoring system diagnoses the partial discharge phenomenon of the device to be tested.
Compared with the prior art, the invention has the beneficial effects that:
the power supply of the active battery is replaced by adopting a passive power taking mode, so that the service life of the equipment is prolonged, and meanwhile, the battery accommodating space is eliminated, so that the equipment is smaller in size, and the equipment device is more miniaturized; meanwhile, the battery does not need to be replaced frequently, so that the maintenance cost is reduced; meanwhile, the invention adopts ultrasonic waves to realize the data acquisition of the partial discharge phenomenon of the equipment to be tested and uploads the acquired data to the background control system for diagnosis in a wireless mode, thereby realizing the on-line diagnosis of the partial discharge of the equipment to be tested. The invention also has the characteristics of convenient installation, simple operation and the like, and can be widely applied to various high-low voltage equipment.
Drawings
Fig. 1 is a block diagram of a passive composite ultrasonic partial discharge sensor according to the present invention;
fig. 2 is a schematic diagram of an installation of a passive composite ultrasonic partial discharge sensor and a device to be tested;
FIG. 3 is a schematic view of the device housing of FIG. 2;
FIG. 4 is a circuit diagram of an ultrasound partial discharge acquisition module;
FIG. 5 is a circuit diagram of a power module;
FIG. 6 is a circuit diagram of an infrared temperature sensor;
FIG. 7 is a circuit diagram of a wireless transmission module;
FIG. 8 is a circuit diagram of the MCU control module.
In the figure: 1. an equipment housing; 2. a device to be tested; 3. a silicon rubber bandage; 4. an induction closing coil; 5. and the equipment temperature acquisition module.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
As shown in fig. 1 to 8, a passive composite ultrasonic partial discharge sensor includes a power module, an ultrasonic partial discharge acquisition module, and an MCU control module.
The power module is a power supply device of the whole sensor, is electrically connected with the MCU control module and is used for supplying power to the whole device so as to ensure the normal work of each module in the device. Preferably, the power supply adopted in the embodiment is realized by adopting a passive power taking mode, so that the power supply of an active battery in the prior art is replaced, the service life of equipment is prolonged, meanwhile, the space for placing a battery device is reduced, and the size of the device is smaller.
That is, the power module includes a CT power taking module and a voltage stabilizing module. The CT power taking module is electrically connected with the power transmission line and used for generating a voltage signal by utilizing the magnetic field change generated by the current of the power transmission line and providing power for each module in the device after the voltage signal is processed by the voltage stabilizing module.
More preferably, as shown in fig. 5, the power module includes a connection terminal a, a connection terminal K, a ground terminal GND, a capacitor CX1, a capacitor CV1, a diode D1, a diode D3, an energy storage capacitor EC2, a voltage regulator tube D4, and a resistor R7.
Wherein, binding post A, binding post K respectively with the both ends electric connection of induction closed coil 4. Preferably, both ends of the induction closing coil 4 in this embodiment are electrically connected to the high voltage transmission line. Due to the electromagnetic induction change generated by the current on the high-voltage transmission line, a voltage signal can be formed between the wiring terminal A and the wiring terminal K, and the electromagnetic induction change is converted into the voltage signal. The present embodiment is directed to detecting partial discharge of equipment in a high-voltage power transmission line network, such as equipment of a high-voltage cable interface, a power transmission line, an insulator, and the like. Therefore, when the sensor of the present embodiment is installed on the device under test 2, the induction closed coil 4 is electrically connected to the power transmission line in the high voltage power transmission line network, so as to realize the passive power taking function.
The capacitor CX1, the capacitor CV1, the diode D1 and the diode D3 form a full-wave rectifying circuit. The full-wave rectifying circuit is electrically connected with the anode of the energy storage capacitor EC 2. When the induction closed coil 4 is connected to a high-voltage transmission line, the current of the transmission line generates electromagnetic change, so that a voltage signal is formed between the wiring terminal A and the wiring terminal K, and the voltage signal passes through the full-wave rectification circuit and then is stored by the energy storage capacitor EC 2. The energy storage capacitor EC2 outputs the power source VCC to the outside through the resistor R7, and outputs the power source VCC through the output terminal EOUT.
Preferably, the negative electrode of the energy storage capacitor EC2 is grounded. The resistor R7 is grounded through a voltage regulator tube D4, and the voltage regulator tube D4 is used for voltage regulation, so that the output voltage signal is in a stable state, and a rear-stage circuit is protected.
The embodiment realizes power supply by utilizing the electromagnetic induction formed by the current of the high-voltage cable or the power transmission line, thereby replacing the power supply of the existing active battery, greatly prolonging the service life of the equipment, and simultaneously reducing the space for placing the battery for the whole equipment.
Preferably, in this embodiment, a passive power taking mode is adopted, so that the ultrasonic partial discharge sensor device needs to be in direct contact with the device to be tested 2 and the power transmission line. Therefore, as shown in fig. 2 to 3, the present embodiment provides an ultrasonic partial discharge sensor including an apparatus case 1 and a silicone rubber band 3. Wherein, one end of the silicon rubber bandage 3 is fixedly connected with one side of the equipment shell 1, and the other end is movably connected with one side of the equipment shell 1. The device case 1 is bound to the outside of the device under test 2 by the silicone rubber band 3, so that the device under test 2 is in direct contact with the device case 1. Meanwhile, the induction closed coil 4 is also bound outside the device 2 to be tested, is electrically connected with the high-voltage transmission line in the high-voltage transmission line network, and is used for inducing an electromagnetic change signal caused by the current of the transmission line.
The ultrasonic partial discharge sensor module is arranged in the equipment shell 1, namely the power module, the ultrasonic partial discharge acquisition module and the MCU control module are arranged in the equipment shell 1. Meanwhile, one end of the induction closed coil 4 is electrically connected with the power supply module, and the other end of the induction closed coil is electrically connected with the power transmission line. The induction closing coil 4 can be arranged on the silicon rubber binding, and also can be arranged at other positions.
In the actual use process, the sensor is bound on the insulator or the transmission line, so that the partial discharge of the insulator or the transmission line can be detected. The device has small volume, convenient installation and convenient operation.
Preferably, the ultrasonic partial discharge acquisition module is electrically connected to the MCU control module, and is configured to acquire a voltage signal generated by an external ultrasonic signal and send the voltage signal to the MCU control module, so as to diagnose the partial discharge phenomenon of the device under test 2 according to the voltage signal.
Preferably, the ultrasonic partial discharge acquisition module of the present embodiment utilizes an ultrasonic signal to detect partial discharge. Specifically, the ultrasonic partial discharge acquisition module comprises an MEMS microphone, an operational amplifier and a signal conditioning circuit. The output end of the MEMS microphone is electrically connected with the operational amplifier, and the operational amplifier is electrically connected with the MCU control module through the signal conditioning circuit. Among them, the MEMS microphone is a piezoelectric effect sensor. When the device to be tested 2 has a partial discharge phenomenon, a corresponding ultrasonic signal can be generated, when the ultrasonic signal is transmitted to the MEMS microphone, the ultrasonic signal can be transmitted to the film silicon wafer of the MEMS microphone, because the change of the ultrasonic signal can change the capacitance on the film silicon wafer of the MEMS microphone to form a weak voltage signal, the weak voltage signal is amplified by the operational amplifier, and the signal conditioning circuit conditions the signal and then transmits the conditioned signal to the MCU control module, so that the partial discharge phenomenon of the device to be tested 2 can be detected according to the voltage signal.
More preferably, as shown in fig. 4, the ultrasonic partial discharge acquisition module includes a MEMS microphone U1, a pre-amplification circuit and a post-amplification circuit. And the MEMS microphone U1 is used for generating a voltage signal according to an external ultrasonic signal, amplifying the voltage signal by a front-stage amplification circuit and a rear-stage amplification circuit and outputting the amplified voltage signal to the MCU control module.
The pre-amplification circuit comprises a capacitor C1, an operational amplifier U3, a capacitor C3, a resistor R1, a resistor R30, a resistor R17 and a resistor R24. The capacitor C1, the operational amplifier U3, the capacitor C3, the resistor R1 and the resistor R30 form bias voltage, and the resistor R17 and the resistor R24 form a proportional amplification circuit.
The grounding end GND and the drain output end OUT of the MEMS microphone U1 are electrically connected with the negative input end of the operational amplifier U3 through the capacitor C1 and the resistor R24 in sequence, the power supply end VDD is electrically connected with the MCU control module, and the power supply end VDD is further grounded through the capacitor C34.
The positive input end of the operational amplifier U3 is electrically connected with the MCU control module through a resistor R1 and is grounded through a resistor R30. The power supply anode of the operational amplifier U3 is grounded through a capacitor C3 and is electrically connected with the MCU control module. The power supply cathode of the operational amplifier U3 is connected to ground.
A field effect transistor is arranged in the MEMS microphone U1, and a drain output pin OUT of the MEMS microphone U1 is connected to an inverting input terminal of the operational amplifier U3 through a capacitor C1. Because the collected signals are alternating current signals, the capacitor C1 has the function of isolating direct current and alternating current, the collected alternating current signals can be filtered, and the direct current signals are filtered. The positive input end of the operational amplifier U3 is also electrically connected with the MCU control module through a resistor R1. The operation control of the operational amplifier U3 can be realized through the MCU control module. Similarly, the VDD terminal of the MEMS microphone U1 is electrically connected to the MCU control module, and the MCU control module controls the operation of the MEMS microphone U1.
More preferably, the resistor R1 and the resistor R30 are used for providing a bias voltage for the operational amplifier U3, so that the integrity of the signal and the operation of the operational amplifier in a saturated conducting state are ensured. The output end of the operational amplifier U3 is connected to the resistor R24 through the resistor R17 to form a depth negative feedback and proportional amplification circuit, and the signal gain can be ensured to be stable through the depth negative feedback.
Preferably, the post-stage amplifying circuit comprises an operational amplifier U8, a capacitor C2, a capacitor C4, a capacitor C5, a capacitor C28, a resistor R20, a resistor R26, a resistor R28, a resistor R29, a resistor R30 and a resistor R31.
The output end OUT of the operational amplifier U3 is electrically connected with the negative input end of the operational amplifier U8 sequentially through the capacitor C2, the resistor R26 and the capacitor C5. The positive input end of the operational amplifier U8 is electrically connected with the MCU control module through a resistor R28 and is grounded through a resistor R31. The power supply anode of the operational amplifier U8 is grounded through a capacitor C4 and is electrically connected with the MCU control module. The output end of the operational amplifier U8 is electrically connected with the MCU control module, and is connected between the capacitor C5 and the negative input end of the operational amplifier U8 through a resistor R20, and is connected between the resistor R26 and the capacitor C5 through a capacitor C28. The capacitor C28 is also connected to ground through resistor R30.
The capacitor C4, the capacitor C5, the capacitor C2, the capacitor C28, the resistor R26, the resistor R29, the resistor R20, the resistor R28 and the resistor R31 form an infinite gain multi-path negative feedback active second-order band-pass filter, the filter is input from an inverting end, and the filter has the characteristics of small distortion, high precision, low element sensitivity requirement and the like.
The resistor R28 and the resistor R31 are connected with the positive input end of the operational amplifier U8, and provide bias direct-current voltage for the transport amplifier U8. The output end OUT of the operational amplifier U8 is electrically connected with the MCU control module and is used for outputting the amplified voltage signal to the MCU control module. The diagnosis of the partial discharge phenomenon of the device to be tested 2 can be realized according to the voltage signal.
The MEMS patch microphone with small volume is adopted, so that the device has the characteristics of smaller volume, smaller working current, wide measured frequency range and the like.
Preferably, as shown in fig. 8, the MCU control module includes a chip U5 and a peripheral circuit. The port 9 of the chip U5, the port 9 of the chip U5 are electrically connected to the VDD terminal of the MEMS microphone U1, the positive input terminal of the operational amplifier U3 through a resistor R1, and the positive input terminal of the operational amplifier U8 through a resistor R28, respectively; the MCU control module controls the working states of the MEMS microphone U1, the operational amplifier U3 and the operational amplifier U8 through a port 9 of the chip U5, starts the work of the ultrasonic partial discharge acquisition module and controls the ultrasonic partial discharge acquisition module to acquire voltage signals. For example, the MCU control module can be used for realizing flexible work of the ultrasonic partial discharge acquisition module, and the power consumption is saved. Similarly, the port VDD of the chip U5 is electrically connected to the output terminal of the power supply module, and supplies power to the MCU control module through the power supply module, thereby ensuring the operation of the MCU control module.
Preferably, the present embodiment further includes a device temperature acquisition module 5. The device temperature acquisition module 5 is installed on the device shell 1, is electrically connected with the MCU control module, and is used for detecting the temperature of the device to be detected 2 and sending the generated temperature signal to the MCU control module.
When the device under test 2 has partial discharge, the device under test 2 is heated. The partial discharge of equipment can influence the work of equipment when reaching the certain degree, consequently, this embodiment realizes gathering the temperature of equipment 2 to be tested through setting up equipment temperature acquisition module 5, comes the diagnosis of comprehensive judgement equipment 2 to be tested's partial discharge phenomenon through the monitoring to equipment 2 to be tested's temperature.
Meanwhile, in order to save system energy consumption, the present embodiment further controls the operation of the ultrasonic partial discharge acquisition module through the temperature change of the device to be measured 2. Specifically, when the temperature acquired by the MCU control module through the device temperature acquisition module 5 is greater than a preset value, the MCU control module controls the ultrasonic partial discharge acquisition module to start up to acquire a voltage signal. For example, the port 9 of the chip U5 of the MCU control module controls the VDD port of the MEMS microphone U1, the positive input terminal of the operational amplifier U3, and the positive input terminal of the operational amplifier U8 to wake up the operations of the MEMS microphone, the operational amplifier U3, and the transport amplifier U8, thereby acquiring the voltage signal. Meanwhile, a port 11(SADC0) of a chip U5 of the MCU control module is electrically connected to an output terminal OUT of an operational amplifier U8 of the ultrasonic partial discharge acquisition module, so as to obtain a voltage signal acquired by the ultrasonic partial discharge acquisition module.
Preferably, the device temperature acquisition module 5 is implemented by an infrared temperature measuring device or a contact temperature measuring device. Specifically, as shown in fig. 6, when the infrared temperature measuring device is the infrared temperature measuring sensor S1, the VDD port of the infrared temperature measuring sensor S1 is grounded through the capacitor C10, the TSDA port and the TSCL port are electrically connected to the port 28 and the port 27 of the MCU, respectively, and the GND port is grounded; when the temperature of the device to be tested 2 detected by the infrared temperature measuring sensor S1 exceeds the preset value, the MCU control module controls the start of the MEMS microphone, the operational amplifier U3, and the operational amplifier U8 through the port 9, and then starts the collection of the ultrasonic partial discharge collection module for the first voltage signal.
Preferably, the present embodiment further includes a communication module. The MCU control module is in communication connection with the background control system through the communication module. The invention can realize the online diagnosis of the partial discharge phenomenon of the equipment to be tested 2 and is convenient for users to use. As shown in fig. 7, the communication module is a wireless transmission module, and includes a chip U10 and a peripheral circuit.
The port 22 of the chip U10 is electrically connected with the antenna ANT through the inductor L2, and transmits data acquired by the MCU control module to the background control system through the 2.4G frequency band.
The ports 16, 17, 18, 19, 8, 7 and 3 of the chip U10 are electrically connected with the ports 19, 20, 18, 21, 29, 30 and 6 of the chip U5 of the MCU control module, respectively.
Preferably, when the background control system detects the partial discharge phenomenon of the device 2 to be tested, the background control system restores the voltage signal to diagnose the partial discharge phenomenon and measure the temperature of the device. The diagnosis of the partial discharge phenomenon can be obtained by using a fast fourier transform algorithm, which is well known to those skilled in the art, and the present invention is not specifically described.
And when the partial discharge phenomenon exists, adjusting the acquisition frequency according to the amplitude of the partial discharge. That is, when the background control system determines that the partial discharge phenomenon exists, the background control system sends a control instruction to the MCU control module, and adjusts the acquisition frequency of the MCU control module for acquiring data from the ultrasonic wave acquisition module and the device temperature acquisition module 5.
The passive CT power supply mode is adopted to replace the active battery power supply mode in the prior art, so that the maintenance cost is reduced, and the service life of equipment is prolonged; meanwhile, the invention has small volume and can be suitable for online diagnosis of various high-low voltage equipment, such as switch cabinets, buses, circuit breakers, power transmission line terminals and the like. The ultrasonic partial discharge acquisition module has the advantages that signal amplification and a filter circuit are improved, so that fewer product devices are produced, adverse effects of a sensor due to a thermal effect are reduced, the cost is reduced, signal acquisition and gain are more temperature-dependent, noise waves are less, and a detection result is more accurate. The invention also controls the flexible work of the ultrasonic partial discharge acquisition module and the acquisition frequency of partial discharge detection data by increasing the temperature detection of the equipment and controlling the temperature of the equipment, thereby saving the energy consumption of the system and realizing the timely detection. The invention can also upload the collected data to a remote background monitoring system in a wireless way, and breaks the inconvenience and rapidness brought by the traditional manual meter reading.
Preferably, based on the passive composite ultrasonic sensor provided in the above embodiment, the present invention further provides a monitoring system of the passive composite ultrasonic sensor, including a background control system and one or more passive composite ultrasonic partial discharge sensors. Each passive composite ultrasonic partial discharge sensor is mounted on the corresponding device to be tested 2 and used for sending the acquired voltage signal and/or temperature signal to the background monitoring system, so that the background monitoring system diagnoses the partial discharge phenomenon of the device to be tested 2. That is, the present invention can perform online diagnosis of partial discharge phenomenon for a plurality of devices under test 2 at the same time.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. A passive composite ultrasonic partial discharge sensor is arranged on equipment to be tested in a high-voltage transmission line network; the passive composite ultrasonic partial discharge sensor is characterized by comprising a power module, an ultrasonic partial discharge acquisition module, an induction closed coil and an MCU (microprogrammed control unit) control module; the induction closed coil is electrically connected with a transmission line in the high-voltage transmission line network and used for inducing an electromagnetic change signal generated by the current of the high-voltage transmission line; one end of the power supply module is electrically connected with the induction closed coil, and the other end of the power supply module is electrically connected with the MCU control module and used for generating a power supply signal according to electromagnetic change and providing a power supply for the MCU control module; the ultrasonic wave partial discharge acquisition module is electrically connected with the MCU control module and used for generating a first voltage signal and sending the first voltage signal to the MCU control module when the equipment to be tested has a partial discharge phenomenon, so that the MCU control module sends the first voltage signal to the background monitoring system, and the background monitoring system diagnoses the partial discharge phenomenon of the equipment to be tested according to the first voltage signal.
2. The passive composite ultrasonic partial discharge sensor according to claim 1, wherein the passive composite ultrasonic partial discharge sensor comprises an equipment housing and a silicon rubber band; one end of the silicon rubber binding band is fixedly connected with one side of the equipment shell, the other end of the silicon rubber binding band is movably connected with the other side of the equipment shell, and the equipment shell is bound on the equipment to be tested through the silicon rubber binding band and is in direct contact with the equipment to be tested; the power module, the ultrasonic partial discharge acquisition module and the MCU control module are all arranged inside the equipment shell.
3. The passive composite ultrasonic partial discharge sensor according to claim 1, wherein the power module comprises a CT power-taking module and a voltage-stabilizing module; the input end of the CT power taking module is electrically connected with the induction closed coil, and the output end of the CT power taking module is electrically connected with the MCU control module through the voltage stabilizing module; and the CT power taking module is used for forming a second voltage signal according to the electromagnetic change signal induced by the induction closed coil and stabilizing the second voltage signal through the voltage stabilizing module to form the power supply signal.
4. The passive composite ultrasonic partial discharge sensor according to claim 3, wherein the power module comprises a connection terminal A, a connection terminal K, a ground terminal GND, a capacitor CX1, a capacitor CV1, a diode D1, a diode D3, an energy storage capacitor EC2, a voltage regulator tube D4 and a resistor R7; the connecting terminal A and the connecting terminal K are respectively electrically connected with two ends of the induction closed coil, and a second voltage signal is formed between the connecting terminal A and the connecting terminal K through the induction closed coil; the capacitor CX1, the capacitor CV1, the diode D1 and the diode D3 form a full-wave rectifying circuit, and the full-wave rectifying circuit is electrically connected with the anode of the energy storage capacitor EC2 and is used for rectifying the second voltage signal and storing energy through the energy storage capacitor EC 2; the ground terminal GND is grounded; the energy storage capacitor EC2 outputs a power supply VCC outwards through a resistor R7; the negative electrode of the energy storage capacitor EC2 is grounded; resistor R7 is also connected to ground through a voltage regulator D4.
5. The passive composite ultrasonic partial discharge sensor according to claim 1, wherein the ultrasonic partial discharge acquisition module comprises a MEMS microphone U1, a pre-amplification circuit and a post-amplification circuit; the preamplifier circuit comprises a capacitor C1, an operational amplifier U3, a capacitor C3, a resistor R1, a resistor R30, a resistor R17 and a resistor R24; the post-stage amplifying circuit comprises an operational amplifier U8, a capacitor C2, a capacitor C4, a capacitor C5, a capacitor C28, a resistor R20, a resistor R26, a resistor R28, a resistor R29, a resistor R30 and a resistor R31;
the grounding end GND and the drain output end OUT of the MEMS microphone U1 are sequentially connected with the negative input end of the operational amplifier U3 through the capacitor C1 and the resistor R24, the power supply end VDD is electrically connected with the MCU control module, and the power supply end VDD is further grounded through the capacitor C34;
the positive input end of the operational amplifier U3 is electrically connected with the MCU control module through a resistor R1 and is grounded through a resistor R30; the power supply anode of the operational amplifier U3 is grounded through a capacitor C3 and is electrically connected with the MCU control module; the negative power supply of the operational amplifier U3 is grounded;
the output end OUT of the operational amplifier U3 is electrically connected with the negative input end of the operational amplifier U8 sequentially through the capacitor C2, the resistor R26 and the capacitor C5; the positive input end of the operational amplifier U8 is electrically connected with the MCU control module through a resistor R28 and is grounded through a resistor R31; the power supply anode of the operational amplifier U8 is grounded through a capacitor C4 and is electrically connected with the MCU control module; the output end OUT of the operational amplifier U8 is electrically connected with the MCU control module, is connected between the capacitor C5 and the negative input end of the operational amplifier U8 through a resistor R20, and is connected between the resistor R26 and the capacitor C5 through a capacitor C28; the capacitor C28 is also grounded through a resistor R30; the MEMS microphone U1 is configured to generate a first voltage signal according to an external ultrasonic signal, amplify the first voltage signal by a pre-stage amplification circuit and a post-stage amplification circuit, and output the amplified first voltage signal to the MCU control module through an output terminal OUT of the transport amplifier U8.
6. The passive composite ultrasonic partial discharge sensor according to claim 5, wherein the MCU control module comprises a chip U5; the port 9 of the chip U5 is electrically connected to the VDD terminal of the MEMS microphone U1, the positive input terminal of the operational amplifier U3 through the resistor R1, and the positive input terminal of the operational amplifier U8 through the resistor R28, respectively; the MCU control module controls the working states of the MEMS microphone U1, the operational amplifier U3 and the operational amplifier U8 through a port 9 of a chip U5, starts the work of the ultrasonic partial discharge acquisition module and controls the ultrasonic partial discharge acquisition module to acquire a first voltage signal; the port 11 of the chip U5 is electrically connected to the output end OUT of the operational amplifier U8 of the ultrasonic partial discharge acquisition module, and is configured to obtain a first voltage signal acquired by the ultrasonic partial discharge acquisition module.
7. The passive composite ultrasonic partial discharge sensor according to claim 6, wherein the passive composite ultrasonic partial discharge sensor comprises an equipment temperature acquisition module, the equipment temperature acquisition module is electrically connected with the MCU control module and is used for detecting the temperature of the equipment to be detected and sending a generated temperature signal to the MCU control module, so that the MCU control module sends the temperature signal to the background control system; the MCU control module is also used for controlling the ultrasonic partial discharge acquisition module to start and receiving a first voltage signal sent by the ultrasonic partial discharge acquisition module when the temperature of the equipment to be detected is judged to be greater than a threshold value according to the temperature signal; the equipment temperature acquisition module is an infrared temperature measuring device or a contact temperature measuring device.
8. The passive composite ultrasonic partial discharge sensor according to claim 7, wherein the passive composite ultrasonic partial discharge sensor comprises a communication module, and the MCU control module is in communication connection with a background control system through the communication module; the communication module is a wireless transmission module, and the wireless transmission module comprises a chip U10 and an antenna ANT; the port 22 of the chip U10 is electrically connected with an antenna ANT through an inductor L2, and data acquired by the MCU control module are transmitted to a background control system through a 2.4G frequency band; the ports 16, 17, 18, 19, 8, 7 and 3 of the chip U10 are electrically connected with the ports 19, 20, 18, 21, 29, 30 and 6 of the chip U5 of the MCU control module, respectively.
9. The passive composite ultrasonic partial discharge sensor according to claim 1, wherein when the background control system detects that the device under test has a partial discharge phenomenon, the background control system sends a control instruction to the MCU control module, so that the MCU control module sets the acquisition frequency of the ultrasonic partial discharge acquisition module according to the control instruction.
10. A monitoring system for a passive composite ultrasonic partial discharge sensor, comprising a background control system and one or more passive composite ultrasonic partial discharge sensors according to any one of claims 1 to 9; each passive composite ultrasonic partial discharge sensor is installed on the corresponding device to be tested and used for sending the acquired voltage signal and/or temperature signal to the background monitoring system, so that the background monitoring system diagnoses the partial discharge phenomenon of the device to be tested.
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| CN202110176268.0A CN112858854A (en) | 2021-02-06 | 2021-02-06 | Passive composite ultrasonic partial discharge sensor and monitoring system |
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| CN202110176268.0A CN112858854A (en) | 2021-02-06 | 2021-02-06 | Passive composite ultrasonic partial discharge sensor and monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114256983A (en) * | 2021-12-28 | 2022-03-29 | 福建中电合创电力科技有限公司 | Monitoring circuit is put in intelligence office |
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- 2021-02-06 CN CN202110176268.0A patent/CN112858854A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114256983A (en) * | 2021-12-28 | 2022-03-29 | 福建中电合创电力科技有限公司 | Monitoring circuit is put in intelligence office |
| CN114256983B (en) * | 2021-12-28 | 2024-02-23 | 福建中电合创电力科技有限公司 | Intelligent partial discharge monitoring circuit |
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