CN209946304U - Ultrasonic remote measurement partial discharge detection device - Google Patents
Ultrasonic remote measurement partial discharge detection device Download PDFInfo
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- CN209946304U CN209946304U CN201920278166.8U CN201920278166U CN209946304U CN 209946304 U CN209946304 U CN 209946304U CN 201920278166 U CN201920278166 U CN 201920278166U CN 209946304 U CN209946304 U CN 209946304U
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Abstract
The utility model relates to the technical field of detection, in particular to an ultrasonic remote measuring partial discharge detection device; the detection device includes: the signal processing device is connected with the signal output end of the wave condenser; the wave condenser comprises a wave condenser body and an ultrasonic sensor; the wave gathering device body is horn-shaped, and the ultrasonic sensor is arranged in the center of the interior of the wave gathering device body; the signal processing equipment comprises a shell and a signal processing system arranged in the shell; the signal processing equipment comprises a shell and a signal processing system arranged in the shell; the signal processing system is used for amplifying and collecting signals detected by the ultrasonic sensor and comprises a power supply unit, an amplifying unit and a signal collecting unit; the amplifying unit comprises a pre-amplifying circuit, a filter circuit and a gain amplifying circuit which are connected in sequence. The utility model discloses a non-contact measurement mode, the circuit need not the outage, measures convenient and fast, and it is high to detect the accuracy.
Description
Technical Field
The utility model relates to a detect technical field, especially relate to a detection device is put in ultrasonic wave telemetering measurement office.
Background
The partial discharge is a discharge phenomenon that when the field intensity generated by the external voltage in the electrical equipment is enough to discharge in the insulation partial area, but a fixed discharge channel is not formed in the discharge area, and the discharge is limited by further causing the insulation partial short circuit between the conductors without forming a conductive channel; each time of partial discharge has some influence on an insulating medium, and strong partial discharge can quickly reduce the insulating strength, which is an important factor for causing the insulation damage of high-voltage power equipment; when partial discharge occurs in insulation, the insulation service life is influenced, and when the partial discharge exceeds a certain degree, the equipment is required to be withdrawn from operation for maintenance or replacement;
when the 10kV distribution network line is mostly an insulated line, most of the insulated faults are concealed faults, and an insulator is broken down, a patrol worker is difficult to judge by naked eyes, a pole is usually required to be climbed and power cut operation is required in the actual detection process, the measurement time is long, the live-line detection workload of the large-area distribution network line is huge, the conventional detection means is difficult to realize, a large amount of manpower and material resources are required to be consumed, the line is required to be powered off, and the reliability of distribution network power supply is greatly influenced; furthermore, because the ultrasonic energy generated by the partial discharge is very low, attenuation, reflection and absorption can also occur in the transmission process, and the signal received by the sensor is very weak; the wave collector adopted in the prior art converges ultrasonic signals, but the area is small, the diameter is usually 16cm, and the effect of obviously improving the detection accuracy is not achieved;
in view of the above, it is an urgent need in the art to provide an ultrasonic telemetry partial discharge detection apparatus to overcome the above-mentioned drawbacks.
Disclosure of Invention
The utility model aims at providing a detection device is put in ultrasonic wave telemetering measurement office adopts non-contact measurement mode, and the circuit need not the outage, measures convenient and fast, and it is high to detect the accuracy.
For solving the above technical problem, the technical scheme of the utility model is that: an ultrasonic telemetry partial discharge detection apparatus, the detection apparatus comprising: the signal processing device is connected with the signal output end of the wave condenser;
the wave condenser comprises a wave condenser body and an ultrasonic sensor; the wave gathering device body is horn-shaped, and the ultrasonic sensor is arranged in the center of the interior of the wave gathering device body; the inner reflecting surface of the wave condenser body is a paraboloid, the paraboloid is used for condensing remote partial discharge ultrasonic signals to the ultrasonic sensor, and the diameter of the paraboloid is larger than 65 cm;
the signal processing equipment comprises a shell and a signal processing system arranged in the shell; the signal processing system is used for amplifying and collecting signals detected by the ultrasonic sensor and comprises a power supply unit, an amplifying unit and a signal collecting unit; the signal input end of the power supply unit is externally connected with 220V alternating current, and the signal output end of the power supply unit is connected with the power supply ends of the amplification unit and the signal acquisition unit; the signal input end of the amplification unit is connected to the signal output end of the ultrasonic sensor, the signal output end of the amplification unit is connected to the signal input end of the signal acquisition unit, and the signal output end of the signal acquisition unit is connected to an additional upper computer; the amplifying unit comprises a pre-amplifying circuit, a filter circuit and a gain amplifying circuit which are connected in sequence.
According to above scheme, gather ripples ware body outside and be equipped with the handle, make things convenient for the handheld orientation that reaches transform ripples ware body of gathering of operating personnel, convenient operation is swift.
According to the scheme, the signal receiving distance of the ultrasonic sensor is more than 25 meters; and the remote receiving of ultrasonic signals during non-contact measurement is realized.
According to the scheme, the power supply unit comprises a switching power supply, a first voltage conversion circuit and a second voltage conversion circuit; the input end of the switching power supply is externally connected with 220V alternating current and is used for converting the 220V alternating current into +24V direct current, the signal input end of the first voltage conversion circuit is connected with the signal output end of the switching power supply and is used for converting the +24V direct current into +5V direct current, and the signal input end of the second voltage conversion circuit is connected with the signal output end of the first voltage conversion circuit and is used for converting the +5V direct current into-5V direct current.
According to the scheme, the pre-amplification circuit comprises an operational amplifier U1 and an external resistor Rg connected to the operational amplifier U1; the model of the operational amplifier U1 is AD620, and the input end of the operational amplifier U1 is connected with the signal output end of the ultrasonic sensor; the positive power supply end of the operational amplifier U1 is connected to the signal output end of the first voltage conversion circuit, and the negative power supply end of the operational amplifier U1 is connected to the signal output end of the second voltage conversion circuit; the external resistance Rg is connected to operational amplifier U1's external resistance link, and the magnification of preamplification circuit is: g is 49.9k omega/Rg + 1.
According to the scheme, the filter circuit is a voltage-controlled voltage source second-order high-pass filter circuit and comprises an operational amplifier U2, filter capacitors C8 and C9 and load resistors R3 and R4; the input end of a filter capacitor C8 is connected with the output end of an operational amplifier U1, the output end of a filter capacitor C8 is connected with the output end of the operational amplifier U2 after being connected with a load resistor R3 in series, the input end of the filter capacitor C9 is connected with the output end of a filter capacitor C8, the output end of the filter capacitor C9 is connected with the load resistor R4 in series and then grounded, and the homodromous input end of an operational amplifier U2 is connected with the output end of the filter capacitor C9; the inverting input end and the output end of the operational amplifier U2 are connected to form a buffer; the positive power supply terminal of the operational amplifier U2 is connected to the signal output terminal of the first voltage conversion circuit, and the negative power supply terminal of the operational amplifier U2 is connected to the signal output terminal of the second voltage conversion circuit.
According to the scheme, the gain amplification circuit comprises an operational amplifier U3, a first voltage-dividing resistor R7 and a second voltage-dividing resistor R8; the model of the operational amplifier U3 is AD603, the first voltage-dividing resistor R7 and the second voltage-dividing resistor R8 are connected in series, the middle joint of the first voltage-dividing resistor R7 and the second voltage-dividing resistor R8 is connected with the positive-phase input end of the gain control voltage of the AD603, the other end of the first voltage-dividing resistor R7 is connected with the output end of the first voltage conversion circuit, and the other end of the second voltage-dividing resistor R8 is grounded; the operational amplifier input end of the operational amplifier U3 is connected to the signal output end of the operational amplifier U2; a load resistor R10 is connected between the feedback network connecting end of the operational amplifier U3 and the operational amplifier output end; the positive power supply end of the operational amplifier U3 is connected to the signal output end of the first voltage conversion circuit, and the negative power supply end of the operational amplifier U3 is connected to the signal output end of the second voltage conversion circuit; and the operational amplifier output end of the operational amplifier U3 is connected to the signal acquisition unit.
According to the scheme, the signal acquisition unit is a data acquisition card, and the model number of the signal acquisition card is AD 6021; the acquisition precision is high.
The utility model discloses following beneficial effect has:
the ultrasonic signal generated by partial discharge is detected by the ultrasonic sensor, the horn-shaped wave collector body is additionally arranged on the ultrasonic sensor, the internal reflection surface of the wave collector body is a paraboloid, and the paraboloid is used for collecting the ultrasonic signal generated by partial discharge of a remote insulator to the ultrasonic sensor; the diameter of the paraboloid is more than 65 cm; the larger the paraboloid area is, dispersed ultrasonic waves emitted by the insulator partial discharge can be captured better, and the intensity of ultrasonic signals is improved, so that the accuracy of the partial discharge test intensity is improved; the ultrasonic signal generated by the partial discharge can be detected under the condition of long distance, so that the abnormal detection of the partial discharge is realized; the utility model adopts a non-contact measuring mode, when detecting, the line is not required to be cut off, the operator is not required to climb the pole or take safety measures, the pole climbing time can be saved, the partial discharge abnormity of the distribution network overhead line insulator can be conveniently and rapidly measured, the time and the labor are saved, and the detection accuracy is high; the requirement for the operation and the first-aid repair of the power equipment is met, the working efficiency of operation and maintenance personnel is improved, the power failure time caused by equipment defects is reduced, and the management level and the engineering quality of a power grid enterprise are improved;
secondly, the amplifying unit of the utility model adopts the pre-amplifying circuit, the filter circuit and the gain amplifying circuit which are connected in sequence, so that the impedance matching of the front and the rear circuits is ensured while the amplification is carried out, and the undistorted signal is ensured; the filter circuit performs noise suppression, so that the energy of the signal is concentrated in the optimal detection frequency band, and the detection accuracy is further improved.
Drawings
Fig. 1 is a schematic view of the overall structure of an embodiment of the present invention;
FIG. 2 is a block diagram of a signal processing system according to the present embodiment;
FIG. 3 is a block diagram showing the structure of an amplifying unit according to the present embodiment;
fig. 4 is a circuit diagram of a first voltage converting circuit in the power supply unit of the present invention;
fig. 5 is a circuit diagram of a second voltage converting circuit in the power supply unit of the present invention;
fig. 6 is a circuit diagram of a middle preamplifier circuit according to the present invention;
fig. 7 is a circuit diagram of the filter circuit of the present invention;
fig. 8 is a circuit diagram of the middle gain amplifier circuit of the present invention;
fig. 9 is a schematic view of the operation of the present invention.
Reference numerals: 1. a wave condenser; 101. a wave condenser body; 102. an ultrasonic sensor; 103. a handle; 2. a signal processing device; 201. a housing; 202. a signal processing system; 3. an upper computer; 4. an insulator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 9, the present invention relates to an ultrasonic remote measurement partial discharge detection device, which includes a wave condenser 1 and a signal processing device 2 connected to a signal output end of the wave condenser 1; the wave condenser 1 comprises a wave condenser body 101 and an ultrasonic sensor 102; the wave collector body 101 is horn-shaped, and the ultrasonic sensor 102 is arranged in the center of the interior of the wave collector body 101; the signal processing device 2 comprises a shell 201 and a signal processing system 202 arranged in the shell 201; the signal input end of the signal processing system 202 is connected to the signal output end of the ultrasonic sensor 102, and the signal output end of the signal processing system 202 is connected to the upper computer 3.
Referring to fig. 1, the inner reflecting surface of the wave collector body 101 is a paraboloid, which is used for collecting the far ultrasonic signal to the ultrasonic sensor 102; the diameter of the paraboloid is larger than 65cm, and after the wave condenser body 101 is adopted, the intensity of the ultrasonic signal is increased by at least 16 times; a handle 103 is arranged on the outer side of the wave collector body 101; the signal receiving distance of the ultrasonic sensor 102 is greater than 25 meters, in this embodiment, the ultrasonic sensor 102 is an air ultrasonic sensor 102 manufactured by Nanjing Zhi De electric technology Limited, and has the model number ZD-AA04M, and the center frequency of the sensor is 40 kHz. Ultrasonic signals generated by partial discharge of the insulator 4 and detected by the ultrasonic sensor 102 are transmitted to the signal processing equipment 2 for data processing and then uploaded to another upper computer 3 for displaying detection results.
Referring to fig. 2, the signal processing system 202 includes an amplifying unit, a signal collecting unit, and a power supply unit; the signal input end of the power supply unit is externally connected with 220V alternating current, and the signal output end of the power supply unit is connected with the power supply ends of the amplification unit and the signal acquisition unit to provide working voltage for the amplification unit and the signal acquisition unit; the signal input end of the amplifying unit is connected to the signal output end of the ultrasonic sensor 102 to amplify the detected weak ultrasonic signal, the signal output end of the amplifying unit is connected to the signal input end of the signal acquisition unit, and the signal output end of the signal acquisition unit is connected to the upper computer 3; the signal acquisition unit acquires the amplified ultrasonic signals and uploads the acquired ultrasonic signals to an additional upper computer 3 to obtain a detection result.
Referring to fig. 2, 4 and 5, the power supply unit satisfies different power supply requirements for normal operation of different components in the circuit, and includes a switching power supply, a first voltage conversion circuit and a second voltage conversion circuit, wherein the input terminal of the switching power supply is externally connected with 220V ac power for converting the 220V ac power into +24V dc power, the signal input terminal of the first voltage conversion circuit is connected to the signal output terminal of the switching power supply for converting the +24V dc power into +5V dc power, and the signal input terminal of the second voltage conversion circuit is connected to the signal output terminal of the first voltage conversion circuit for converting the +5V dc power into-5V dc power.
In this implementation, the switching power supply adopts a switching power supply with a model number of NES-35-24; the first voltage conversion circuit comprises a UA78M05 chip, wherein +24V voltage converted by a switching power supply is input to an input end Vin of the UA78M05 chip, an output end Vout outputs +5V voltage, the input end Vin of the UA78M05 chip is connected in series with a capacitor C15 and then grounded, the capacitor C15 is also connected in parallel with a capacitor E1, the output end Vout of the UA78M05 chip is connected in series with a capacitor C16 and then grounded, the capacitor C16 is also connected in parallel with a capacitor E2, and the ground end of the UA78M05 chip is grounded; the capacitors C15, C16, E1 and E2 are used for filtering, so that the anti-interference characteristic of the circuit is enhanced; the second voltage conversion circuit comprises a TPS60400 chip and 3 filter capacitors C17, C18 and C18, wherein C17, C18 and C18 are all 1 muF, the TPS60400 chip is used for inverting input voltage, 2 pins of an input end of the TPS60400 chip are connected with an output end Vout of a UA78M05 chip to obtain +5V voltage, 1 pin of an output end of the TPS60400 chip outputs-5V voltage, 4 pins of a grounding end of the TPS60400 chip are grounded, 2 pins of the input end are grounded after being connected with the filter capacitor C17 in series, 1 pin of the output end is grounded after being connected with the filter capacitor C18 in series, and a filter capacitor C19 is arranged between 3 pins and 5 pins.
Referring to fig. 3, 6, 7 and 8, the amplifying unit includes a pre-amplifying circuit, a filter circuit and a gain amplifying circuit.
The signals output by the partial discharge ultrasonic sensor 102 are generally weak, so that the amplification circuit is required to have the characteristics of high gain and low noise, and the pre-amplification circuit comprises an operational amplifier U1 and an external resistor Rg connected to the operational amplifier U1; the model of the operational amplifier U1 is AD 620; the pre-amplifier circuit in the implementation adopts AD620 as the pre-amplifier, and has simple circuit connection, low noise and high sensitivity; referring to fig. 6, in this embodiment, two input terminals, pin 2 and pin 3, of an operational amplifier U1, i.e., an AD620, are ac-coupled by using non-polar capacitors C1 and C2, respectively, and in order to reduce low-frequency interference in the environment, for example, power frequency interference of 50Hz, two coupling capacitors C1 and C2, respectively, and two load resistors R1 and R2 with one end grounded form a high-pass filter. Pins 7 and 4 of the AD620 chip are respectively a positive power supply port and a negative power supply port, a positive power supply end of the operational amplifier U1 is connected to a signal output end of the first voltage conversion circuit, and a negative power supply end of the operational amplifier U1 is connected to a signal output end of the second voltage conversion circuit; in order to prevent noise of the power supply end from being coupled into the operational amplifier U1, the negative power end 4 pin is connected with the ceramic chip capacitor C3 in series and then grounded, the two ends of the ceramic chip capacitor C3 are connected with the electrolytic capacitor C4 in parallel, the positive power end 7 pin is connected with the ceramic chip capacitor C5 in series and then grounded, and the two ends of the ceramic chip capacitor C5 are connected with the electrolytic capacitor C6 in parallel; the pin 5 is a reference pin, and in order to ensure that the chip can normally work, the pin 5 is grounded; the external resistor Rg is connected between the external resistor connecting end of the operational amplifier U1, namely the pin 1 and the pin 8, and the amplification factor of the pre-amplification circuit is as follows: g is 49.9k omega/Rg + 1; in this embodiment, the resistance of Rg is 5.1k Ω, G is 49.9k Ω/Rg +1 is 10, and the AD620 amplifies the voltage signal of the ultrasonic sensor 102 by 10 times.
In the field partial discharge detection, the filter circuit further filters mechanical vibration noise or interference of other noises in the environment, and a useful signal is reserved; referring to fig. 7, the filter circuit in this embodiment is a voltage-controlled voltage source second-order high-pass filter circuit, and includes an operational amplifier U2, filter capacitors C8 and C9, and load resistors R3 and R4; the input end of a filter capacitor C8 is connected with the output end of an operational amplifier U1, the output end of a filter capacitor C8 is connected with the output end of the operational amplifier U2 after being connected with a load resistor R3 in series, the input end of the filter capacitor C9 is connected with the output end of a filter capacitor C8, the output end of the filter capacitor C9 is connected with the load resistor R4 in series and then grounded, and the pin 3 of the homodromous input end of the operational amplifier U2 is connected with the output end of the filter capacitor C9; the inverting input end 2 pin of the operational amplifier U2 is connected with the output end 1 to form a buffer; the positive power supply end 8 of the operational amplifier U2 is connected to the signal output end of the first voltage conversion circuit to obtain +5V voltage, and the negative power supply end 4 pin of the operational amplifier U2 is connected to the signal output end of the second voltage conversion circuit to obtain-5V voltage.
The ultrasonic wave is a sound wave with the vibration frequency higher than 20kHz, the cut-off frequency of the high-pass filtering is required to be 20kHz, the cut-off frequency f is 1/(2 pi RC), for the convenience of calculation, C8-C9-C, R3-R4-R, C8-220 pF are taken, and R3-36 k omega is obtained by the formula.
The gain amplification circuit is used for further amplifying the voltage signal after noise filtering; referring to fig. 8, the gain amplifying circuit includes an operational amplifier U3, a first voltage dividing resistor R7, and a second voltage dividing resistor R8; the model of the operational amplifier U3 is AD603, the first divider resistor R7 and the second divider resistor R8 are connected in series, the middle joint of the first divider resistor R7 and the second divider resistor R8 is connected with the pin 1 of the positive phase input end of the gain control voltage of the AD603, the other end of the first divider resistor R7 is connected with the output end of the first voltage conversion circuit, the other end of the second divider resistor R8 is grounded, and the pin 2 of the negative phase input end of the gain control voltage of the AD603 is grounded; an operational amplifier input end 3 pin of the operational amplifier U3 is connected with a capacitor C10 in series and then connected with a signal output end of the operational amplifier U2, and the operational amplifier U3 is input in an alternating current coupling mode; a load resistor R10 is connected between a feedback network connecting end 5 pin of the operational amplifier U3 and the operational amplifier output end 7; a positive power supply end 8 pin of the operational amplifier U3 is connected to a signal output end of the first voltage conversion circuit, and a negative power supply end 6 pin of the operational amplifier U3 is connected to a signal output end of the second voltage conversion circuit; in order to prevent noise of a power supply end from being coupled into an operational amplifier U3, a negative power supply end pin 6 is connected with a ceramic chip capacitor C12 in series and then is grounded, two ends of the ceramic chip capacitor C12 are connected with an electrolytic capacitor C11 in parallel, a positive power supply end pin 8 is connected with a ceramic chip capacitor C14 in series and then is grounded, two ends of a ceramic chip capacitor C14 are connected with an electrolytic capacitor C13 in parallel, and the ceramic chip capacitor and the electrolytic capacitor are grounded and decoupled in parallel, so that the system stability is improved; and the pin 7 of the operational amplifier output end of the operational amplifier U3 is connected to the signal acquisition unit.
Gain control voltage V of gain amplifying circuitG＝VCC*R8/(R7+R8)＝4.55V，VGEffective in-0.5V to +0.5V, greater than +0.5V is recorded as +0.5V, and at 30MHz bandwidth, the gain is AG＝40VGThe +20 + 40 × 0.5+ 40dB, and the gain amplifier circuit amplifies the voltage signal output from the filter circuit by a factor of 40.
The amplifying unit amplifies the partial discharge voltage signal detected by the ultrasonic sensor 102, improves the anti-interference capability, and ensures the detection capability of the signal.
The voltage signal amplified by the amplifying unit is input to a signal acquisition unit, and the signal acquisition unit is connected to an upper computer 3 and displays the partial discharge detection result of the voltage signal through the upper computer 3; in this embodiment, the signal acquisition unit is a data acquisition card manufactured by beijing bino measurement and control technology ltd, the model of the data acquisition card is AD6021, and the acquisition precision is high.
Referring to fig. 9, fig. 9 is a schematic diagram of this embodiment ultrasonic remote measurement partial discharge detection device during operation, operating personnel will gather ripples ware body 101 towards insulator 4 partial discharge test points, gather ripples ware body 101 and assemble the ultrasonic signal that the partial discharge produced to ultrasonic sensor 102, ultrasonic sensor 102 shows the partial discharge testing result through host computer 3 after the ultrasonic signal that detects is enlargied through signal processing equipment 2, need not to step on the pole operation, can singlely measure at the shaft tower bottom, need not to step on the pole or take safety measure, and measure convenient and fast, time saving and labor saving.
The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and it is not to be understood that the specific embodiments of the present invention are limited to these descriptions. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (8)
1. An ultrasonic telemetry partial discharge detection device, the detection device comprising: the signal processing device comprises a wave condenser (1) and a signal processing device (2) connected to the signal output end of the wave condenser (1);
the wave condenser (1) comprises a wave condenser body (101) and an ultrasonic sensor (102); the wave collector body (101) is horn-shaped, and the ultrasonic sensor (102) is arranged in the center of the interior of the wave collector body (101); the inner reflecting surface of the wave collector body (101) is a paraboloid, the paraboloid is used for collecting remote partial discharge ultrasonic signals to the ultrasonic sensor (102), and the diameter of the paraboloid is more than 65 cm;
the signal processing device (2) comprises a shell (201) and a signal processing system (202) arranged in the shell (201); the signal processing system (202) is used for amplifying and collecting signals detected by the ultrasonic sensor (102), and the signal processing system (202) comprises a power supply unit, an amplifying unit and a signal collecting unit; the signal input end of the power supply unit is externally connected with 220V alternating current, and the signal output end of the power supply unit is connected with the power supply ends of the amplification unit and the signal acquisition unit; the signal input end of the amplification unit is connected to the signal output end of the ultrasonic sensor (102), the signal output end of the amplification unit is connected to the signal input end of the signal acquisition unit, and the signal output end of the signal acquisition unit is connected to an additional upper computer (3); the amplifying unit comprises a pre-amplifying circuit, a filter circuit and a gain amplifying circuit which are connected in sequence.
2. The ultrasonic telemetry partial discharge detection device of claim 1, wherein: the outer side of the wave collector body (101) is provided with a handle (103).
3. The ultrasonic telemetry partial discharge detection device of claim 1, wherein: the signal receiving distance of the ultrasonic sensor (102) is more than 25 meters.
4. The ultrasonic telemetry partial discharge detection device of claim 1, wherein: the power supply unit comprises a switching power supply, a first voltage conversion circuit and a second voltage conversion circuit; the input end of the switching power supply is externally connected with 220V alternating current and is used for converting the 220V alternating current into +24V direct current, the signal input end of the first voltage conversion circuit is connected with the signal output end of the switching power supply and is used for converting the +24V direct current into +5V direct current, and the signal input end of the second voltage conversion circuit is connected with the signal output end of the first voltage conversion circuit and is used for converting the +5V direct current into-5V direct current.
5. The ultrasonic telemetry partial discharge detection device of claim 4, wherein: the pre-amplification circuit comprises an operational amplifier U1 and an external resistor Rg connected to the operational amplifier U1; the model of the operational amplifier U1 is AD620, and the input end of the operational amplifier U1 is connected with the signal output end of the ultrasonic sensor (102); the positive power supply end of the operational amplifier U1 is connected to the signal output end of the first voltage conversion circuit, and the negative power supply end of the operational amplifier U1 is connected to the signal output end of the second voltage conversion circuit; the external resistance Rg is connected to operational amplifier U1's external resistance link, and the magnification of preamplification circuit is: g is 49.9k omega/Rg + 1.
6. The ultrasonic telemetry partial discharge detection device of claim 5, wherein: the filter circuit is a voltage-controlled voltage source second-order high-pass filter circuit and comprises an operational amplifier U2, filter capacitors C8 and C9 and load resistors R3 and R4; the input end of a filter capacitor C8 is connected with the output end of an operational amplifier U1, the output end of a filter capacitor C8 is connected with the output end of the operational amplifier U2 after being connected with a load resistor R3 in series, the input end of the filter capacitor C9 is connected with the output end of a filter capacitor C8, the output end of the filter capacitor C9 is connected with the load resistor R4 in series and then grounded, and the homodromous input end of an operational amplifier U2 is connected with the output end of the filter capacitor C9; the inverting input end and the output end of the operational amplifier U2 are connected to form a buffer; the positive power supply terminal of the operational amplifier U2 is connected to the signal output terminal of the first voltage conversion circuit, and the negative power supply terminal of the operational amplifier U2 is connected to the signal output terminal of the second voltage conversion circuit.
7. The ultrasonic telemetry partial discharge detection device of claim 6, wherein: the gain amplification circuit comprises an operational amplifier U3, a first voltage-dividing resistor R7 and a second voltage-dividing resistor R8; the model of the operational amplifier U3 is AD603, the first voltage-dividing resistor R7 and the second voltage-dividing resistor R8 are connected in series, the middle joint of the first voltage-dividing resistor R7 and the second voltage-dividing resistor R8 is connected with the positive-phase input end of the gain control voltage of the AD603, the other end of the first voltage-dividing resistor R7 is connected with the output end of the first voltage conversion circuit, and the other end of the second voltage-dividing resistor R8 is grounded; the operational amplifier input end of the operational amplifier U3 is connected to the signal output end of the operational amplifier U2; a load resistor R10 is connected between the feedback network connecting end of the operational amplifier U3 and the operational amplifier output end; the positive power supply end of the operational amplifier U3 is connected to the signal output end of the first voltage conversion circuit, and the negative power supply end of the operational amplifier U3 is connected to the signal output end of the second voltage conversion circuit; and the operational amplifier output end of the operational amplifier U3 is connected to the signal acquisition unit.
8. The ultrasonic telemetry partial discharge detection device of claim 1, wherein: the signal acquisition unit is a data acquisition card and has the model number AD 6021.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920278166.8U CN209946304U (en) | 2019-03-05 | 2019-03-05 | Ultrasonic remote measurement partial discharge detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920278166.8U CN209946304U (en) | 2019-03-05 | 2019-03-05 | Ultrasonic remote measurement partial discharge detection device |
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| CN209946304U true CN209946304U (en) | 2020-01-14 |
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| CN201920278166.8U Active CN209946304U (en) | 2019-03-05 | 2019-03-05 | Ultrasonic remote measurement partial discharge detection device |
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