CN111665420A - Ultrasonic partial discharge detection device and detection method thereof - Google Patents
Ultrasonic partial discharge detection device and detection method thereof Download PDFInfo
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Abstract
The invention discloses an ultrasonic partial discharge detection device and a detection method thereof. The failure of the power equipment is often accompanied by partial discharge, which gradually enlarges the deterioration damage of the insulation. The ultrasonic pulse detector comprises an ultrasonic sensor, an antenna, an alternating current power supply, a voltage divider, an alternating current pulse detector, a controller and an upper computer. The controller is in communication with the upper computer. The three ultrasonic sensors transmit ultrasonic signals to the controller. And an alternating current signal output by the alternating current power supply is transmitted to the controller. The three ultrasonic sensors are respectively arranged at three different positions on the tested electric equipment. The antenna is installed on the tested electric equipment. And the upper computer maps the ultrasonic signals to the alternating current signals to judge the type of the partial discharge fault. The invention takes the electromagnetic signal detected by the antenna as the starting time, and measures the time of the three ultrasonic sensors detecting the ultrasonic signal, thereby obtaining the distance between the local discharge source and the three ultrasonic sensors and greatly reducing the calculation difficulty of the system.
Description
Technical Field
The invention belongs to the technology of partial discharge detection of power equipment, and particularly relates to an ultrasonic partial discharge detection device and a fault positioning and diagnosis method thereof.
Background
Electrical equipment operates for a long time at high temperature, high voltage, and high load conditions, and the equipment may be damaged quickly. If the power equipment fault can be predicted and positioned, and the equipment is replaced and maintained, the economic loss caused by equipment shutdown is greatly reduced. The phenomenon of discharge is often accompanied when power equipment breaks down, the partial discharge generally cannot cause the penetrating breakdown of insulation, a penetrating channel cannot be formed immediately, but the long-term partial discharge gradually enlarges the deterioration damage of the insulation, and finally the whole insulation can be broken down or flashover along the surface. Therefore, online status monitoring and fault location, diagnosis of electrical equipment are very important.
Disclosure of Invention
The invention discloses an ultrasonic partial discharge detection device which comprises an ultrasonic sensor, an antenna, an alternating current power supply, a voltage divider, an alternating current pulse detector, a controller and an upper computer. The controller is in communication with the upper computer. The three ultrasonic sensors transmit ultrasonic signals to the controller. And an alternating current signal output by the alternating current power supply is processed by the voltage divider and the alternating current pulse detector and then transmitted to the controller. The three ultrasonic sensors are respectively arranged at three different positions on the tested electric equipment. The antenna is installed on the tested electric equipment. And the upper computer maps the ultrasonic signals to the alternating current signals to judge the type of the partial discharge fault. The time when the wireless signal generated by the partial discharge reaches the antenna is used as the time when the wireless signal generated by the partial discharge is sent out, so that the time length for transmitting the ultrasonic signal to the three ultrasonic sensors respectively is obtained.
Preferably, the ultrasonic partial discharge detection device of the invention further comprises a signal conditioning circuit. The signal conditioning circuit is disposed between the ultrasonic sensor and the controller. Ultrasonic signals detected by the three ultrasonic sensors are filtered and amplified by the three signal adjusting circuits respectively and then transmitted to the controller.
The signal conditioning circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a triode Q1 and an operational amplifier U1. One end of the capacitor C1 is connected with the output end of the corresponding ultrasonic sensor and one end of the capacitor C3, and the other end is connected with one end of the resistor R2, the resistor R6, the resistor R7 and the base electrode of the triode Q1. The other end of the resistor R6 is connected with one end of the resistor R1. The other end of the resistor R1 is connected with one end of the resistor R3 and the anode of an external power supply Vcc. The other end of the resistor R3 is connected to the collector of the transistor Q1 and one end of the capacitor C2. The other end of the capacitor C2 is connected with one end of the resistor R5 and one end of the resistor R8. The emitter of the transistor Q1 is connected with one end of the resistor R4 and one end of the capacitor C4. The other end of the resistor R8 is connected with one end of the resistor R9 and the inverting input end of the operational amplifier U1. The other end of the resistor R9 is connected with the output end of the operational amplifier U1 and one end of the capacitor C9. The positive input end of the operational amplifier U1 is connected with one end of the resistor R10 and one end of the resistor R11. The power supply end of the operational amplifier U1 is connected with the positive electrode of the external power supply, one end of the capacitor C5 and one end of the capacitor C6, and the ground wire ends are connected with the negative electrode of the external power supply, one end of the capacitor C7 and the negative electrode of the capacitor C8. The resistor R7, the resistor R2, the resistor R4, the resistor R5, the resistor R10, the resistor R11, the capacitor C3, the capacitor C5, the other end of the capacitor C7, the capacitor C4, the negative electrode of the capacitor C6 and the positive electrode of the capacitor C8 are all grounded. The output end of the operational amplifier U1 is the signal output end of the signal conditioning circuit 3 and is connected to the analog-to-digital conversion pin of the controller.
Preferably, the ultrasonic partial discharge detection device of the invention further comprises an electromagnetic pulse detector. And the wireless signal detected by the antenna is processed by the electromagnetic pulse detector and then transmitted to the controller.
Preferably, the controller adopts a single chip microcomputer. The upper computer adopts a computer.
The detection method of the ultrasonic partial discharge detection device comprises a fault positioning method and a fault detection method.
The fault positioning method comprises the following specific steps:
step one, establishing a space rectangular coordinate system, and respectively acquiring coordinate values (x) of three ultrasonic sensors in the space rectangular coordinate system1，y1，z1)、(x2，y2，z2)、(x3，y3，z3)。
Step two, when partial discharge occurs at a certain position in the tested electric equipment, the partial discharge part simultaneously emits electromagnetic signals and ultrasonic signals; and taking the moment when the antenna receives the electromagnetic signal generated by the partial discharge as the ultrasonic emission moment, and starting timing.
Respectively recording the time when the three ultrasonic sensors detect that the ultrasonic signals are generated by the partial discharge, and combining the ultrasonic emission time to obtain the time length t required for transmitting the ultrasonic waves emitted by the partial discharge part to the three ultrasonic sensors1、t2、t3。
And step four, establishing an equation set containing the position coordinates (x, y, z) of the partial discharge part as shown in the formula (1).
(x-x1)2+(y-y1)2+(z-z1)2＝(t1×vs)2
(x-x2)2+(y-y2)2+(z-z2)2＝(t2×vs)2(1)
(x-x3)2+(y-y3)2+(z-z3)2＝(t3×vs)2
In the formula (1), vsIs the ultrasonic wave propagation velocity.
And (3) solving the formula (1) to obtain the position coordinates (x, y, z) of the partial discharge part.
The fault detection method comprises the following specific steps:
step one, carrying out a plurality of groups of calibration tests on the power equipment with different partial discharge fault types, wherein each fault type tests M groups, and M is more than or equal to 10. The process of performing a calibration test on equipment with partial discharge faults is as follows:
1-1, boosting the voltage of the power equipment to enable the tested power equipment to generate partial discharge.
1-2. ultrasonic signal V generated by detecting partial discharge by ultrasonic sensor1(t); AC power supply, voltage divider, AC pulse detector generate an AC signal V2(t) to the controller.
1-3, converting the ultrasonic signal and the alternating current signal into a digital signal through a controller and transmitting the digital signal to an upper computer 10.
1-4, the upper computer maps the ultrasonic signals to alternating current signals to generate a phase-resolved partial discharge diagram; and calibrating the type of the partial discharge fault according to the phase resolution partial discharge diagram of each power device.
Step two, detecting the tested electric equipment, and detecting an ultrasonic signal generated by the partial discharge of the tested electric equipment by using an ultrasonic sensor when the tested electric equipment generates the partial discharge; the AC power source, the voltage divider, and the AC pulse detector generate an AC signal to the controller.
And step three, the controller converts the ultrasonic signals and the alternating current signals into digital signals and transmits the digital signals to an upper computer.
Mapping the ultrasonic partial discharge signal to an alternating current signal by the upper computer to generate a phase-resolved partial discharge diagram; and (4) according to the obtained phase resolution partial discharge diagram, and combining the calibration result in the step one, determining the type of the partial discharge fault of the tested power equipment.
Preferably, the types of partial discharge failure include partial discharge due to oxidation of the element, partial discharge due to deformation of the element, partial discharge due to abrasion of the element, and partial discharge due to the presence of impurities in the element.
Preferably, the process calibrated in the first step of the fault detection method is as follows: calculating an average curve from the curves in the M phase-resolved partial discharge graphs of the same group of power equipment; after that, the average curve is used as a standard curve for evaluating the type of the fault. So that each fault type corresponds to a standard curve.
The process of acquiring the partial discharge fault type currently occurring in the tested power equipment in the fourth step of the fault detection method specifically comprises the following steps: and (4) respectively subtracting the curve in the phase resolution local discharge diagram and each standard curve obtained in the step one, and taking absolute values to obtain a plurality of difference curves. And taking the fault type partial discharge fault type corresponding to the difference curve with the maximum peak value (namely the maximum value) in each difference curve as the current partial discharge fault type of the tested electric equipment.
The invention has the beneficial effects that:
1. according to the invention, the time when the antenna detects the electromagnetic signal is taken as the starting time, and the time when the three ultrasonic sensors detect the ultrasonic signal is measured, so that the distances between the local discharge source and the three ultrasonic sensors are obtained, the positioning of the local discharge is realized, and the calculation difficulty of the system is greatly reduced.
2. The invention overcomes the error caused by the propagation time of the ultrasonic signal by using the antenna, maps the partial discharge signal onto the voltage waveform, generates the phase-resolved partial discharge diagram, and can diagnose and identify the partial discharge fault type.
Drawings
FIG. 1 is a system block diagram of the present invention;
fig. 2 is a circuit schematic of the signal conditioning circuit of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, an ultrasonic partial discharge detection apparatus includes an ultrasonic sensor 1, an antenna 2, a signal conditioning circuit 3, an electromagnetic pulse detector 4, an ac power supply 5, a voltage divider 6, an ac pulse detector 7, a controller 8, a communication module 9, and an upper computer 10. The controller 8 adopts a single chip microcomputer and has an analog-digital conversion function. The upper computer 10 is a computer. Ultrasonic signals detected by the three ultrasonic sensors 1 are filtered and amplified by the three signal adjusting circuits 3 respectively and then transmitted to the controller 8. The wireless signal detected by the antenna 2 is processed by the electromagnetic pulse detector 4 and then transmitted to the controller 8. An alternating current signal output by the alternating current power supply 5 is processed by the voltage divider 6 and the alternating current pulse detector 7 and then transmitted to the controller 8. The controller 8 is connected with the upper computer 10 through a communication module 9.
The three ultrasonic sensors 1 are respectively installed at three different positions on the tested electric equipment and used for detecting sound wave signals generated by partial discharge, converting the sound waves into voltage signals and processing the signals through the signal adjusting circuit 3. The antenna 2 is installed on the tested electric equipment and used for detecting electromagnetic wave signals generated by partial discharge of the equipment, timing is started after the antenna 2 receives the electromagnetic signals, and the time required by the three ultrasonic sensors 1 for detecting the ultrasonic signals is measured, so that the distances between a partial discharge source and the three ultrasonic sensors 1 are obtained, and the position coordinates of the partial discharge are determined. The propagation speed of the electromagnetic wave is about six orders of magnitude higher than that of the ultrasonic wave, after partial discharge occurs, the electromagnetic wave is detected first, and obvious errors cannot be caused by neglecting the transmission time of the electromagnetic wave.
As shown in fig. 2, the signal conditioning circuit 3 is used for amplifying and filtering signals, and includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a transistor Q1, and an operational amplifier U1. One end of the capacitor C1 is connected with the output end of the ultrasonic sensor 1 and one end of the capacitor C3, and the other end is connected with one end of the resistor R2, the resistor R6, the resistor R7 and the base electrode of the triode Q1. The other end of the resistor R6 is connected with one end of the resistor R1. The other end of the resistor R1 is connected with one end of the resistor R3 and the anode of an external power supply Vcc. The other end of the resistor R3 is connected to the collector of the transistor Q1 and one end of the capacitor C2. The other end of the capacitor C2 is connected with one end of the resistor R5 and one end of the resistor R8. The emitter of the transistor Q1 is connected with one end of the resistor R4 and one end of the capacitor C4. The other end of the resistor R8 is connected with one end of the resistor R9 and the inverting input end of the operational amplifier U1. The other end of the resistor R9 is connected with the output end of the operational amplifier U1 and one end of the capacitor C9. The positive input end of the operational amplifier U1 is connected with one end of the resistor R10 and one end of the resistor R11. The power supply end of the operational amplifier U1 is connected with the positive electrode of the external power supply Vcc, one end of the capacitor C5 and one end of the capacitor C6, and the ground terminals are all connected with the negative electrode of the external power supply Vcc, one end of the capacitor C7 and the negative electrode of the capacitor C8. The resistor R7, the resistor R2, the resistor R4, the resistor R5, the resistor R10, the resistor R11, the capacitor C3, the capacitor C5, the other end of the capacitor C7, the capacitor C4, the negative electrode of the capacitor C6 and the positive electrode of the capacitor C8 are all grounded. The output terminal of the operational amplifier U1 is the signal output terminal Vout of the signal conditioning circuit 3, and is connected to the analog-to-digital conversion pin of the controller 8.
An ac power source 5, a voltage divider 6, an ac pulse detector 7 for providing an ac pulse signal to a controller 8 for mapping the ultrasonic signal to the applied voltage signal. The voltage divider 6 is used to reduce the applied voltage and feed it to the ac pulse detector 7. The ac phase detector is configured to detect the ac pulse signal and send it to the controller 8.
And the controller 8(ADC) is used for converting the sensor adjusting signal (converted from the ultrasonic signal) and the pulse signal (converted from the electromagnetic signal) into digital signals and transmitting the digital signals to the upper computer 10.
And the communication module 9 is used for sending the signals to the remote upper computer 10. The upper computer 10 is used for receiving and processing the ultrasonic partial discharge signals detected in real time, mapping the ultrasonic partial discharge signals onto voltage waveforms, and generating a phase-resolved partial discharge diagram, so that the type of the partial discharge fault is diagnosed and identified.
The detection method of the ultrasonic partial discharge detection device comprises a fault positioning method and a fault detection method.
The fault positioning method comprises the following specific steps:
step one, establishing a space rectangular coordinate system, and respectively acquiring coordinate values (x) of three ultrasonic sensors 1 in the space rectangular coordinate system1，y1，z1)、(x2，y2，z2)、(x3，y3，z3)。
Step two, when partial discharge occurs at a certain position in the tested electric equipment, the partial discharge part simultaneously emits electromagnetic signals and ultrasonic signals; the time counting is started with the time when the antenna 2 receives the electromagnetic signal generated by the partial discharge as the starting time.
Step three, respectively recording the time when the three ultrasonic sensors 1 detect that the ultrasonic signals are generated by the partial discharge, thereby obtaining the time length t required for transmitting the ultrasonic waves emitted by the partial discharge part to the three ultrasonic sensors 11、t2、t3。
And step four, establishing an equation set containing the position coordinates (x, y, z) of the partial discharge part as shown in the formula (1).
(x-x1)2+(y-y1)2+(z-z1)2＝(t1×vs)2
(x-x2)2+(y-y2)2+(z-z2)2＝(t2×vs)2(1)
(x-x3)2+(y-y3)2+(z-z3)2＝(t3×vs)2
In the formula (1), vsIs the ultrasonic wave propagation speed (i.e., the sound velocity).
And (3) solving the formula (1) to obtain the position coordinates (x, y, z) of the partial discharge part.
The fault detection method comprises the following specific steps:
step one, a plurality of groups of calibration tests are performed on the power equipment with different partial discharge fault types, wherein each fault type tests M groups, where M is 20 in this embodiment. The partial discharge failure types include partial discharge caused by oxidation of the element, partial discharge caused by deformation of the element, partial discharge caused by abrasion of the element, and partial discharge caused by the presence of impurities in the element. The process of performing a calibration test on equipment with partial discharge faults is as follows:
1-1, boosting the power equipment with different fault types through a high-voltage transformer to enable the power equipment to be tested to generate partial discharge.
1-2, after the antenna 2 receives an electromagnetic signal generated by partial discharge, detecting an ultrasonic signal generated by the partial discharge of equipment through the ultrasonic sensor 1, and performing signal regulation, namely amplification and filtering treatment on the ultrasonic signal through the signal regulating circuit 3; at the same time, the ac power supply 5, the voltage divider 6, and the ac pulse detector 7 generate an ac signal (specifically, a sinusoidal ac signal) to the controller 8.
1-3. transmitting the ultrasonic signal V1(t) and an alternating current signal V2(t) is converted into a digital signal by the controller 8(ADC) and transferred to the upper computer 10.
1-4, the upper computer 10 maps the ultrasonic partial discharge signals to alternating current signals output by an alternating current power supply 5, a voltage divider 6 and an alternating current pulse detector 7 to generate a phase-resolved partial discharge diagram; since the partial discharge fault type of each power device is known in advance, the partial discharge fault type of the power device can be calibrated through a phase-resolved partial discharge diagram.
The calibration process is as follows: calculating an average curve from the curves in the M phase-resolved partial discharge graphs of the same group of power equipment; after that, the average curve is used as a standard curve for evaluating the type of the fault. So that each fault type corresponds to a standard curve.
Secondly, the ultrasonic partial discharge detection device is installed on the tested electric equipment, when the tested electric equipment generates partial discharge, the antenna 2 receives an electromagnetic signal generated by the partial discharge, then the ultrasonic sensor 1 detects an ultrasonic signal generated by the partial discharge of the tested equipment, and the signal adjusting circuit 3 adjusts the ultrasonic signal, namely, the ultrasonic signal is amplified and filtered; at the same time, the ac power source 5, the voltage divider 6, and the ac pulse detector 7 generate an ac signal to the controller 8.
And step three, converting the adjusted ultrasonic signals and alternating current signals into digital signals through the controller 8(ADC) and transmitting the digital signals to the upper computer 10 through the communication unit.
Step four, the upper computer 10 maps the ultrasonic partial discharge signal to an alternating current signal to generate a phase-resolved partial discharge diagram; and (4) according to the obtained phase resolution partial discharge diagram, and combining the calibration result in the step one, determining the type of the partial discharge fault of the tested power equipment.
The specific process is as follows: and (4) respectively subtracting the curve in the phase resolution local discharge diagram and each standard curve obtained in the step one, and taking absolute values to obtain a plurality of difference curves. And taking the fault type partial discharge fault type corresponding to the difference curve with the maximum peak value (namely the maximum value) in each difference curve as the current partial discharge fault type of the tested electric equipment.
Claims (6)
1. An ultrasonic partial discharge detection device comprises an ultrasonic sensor, an alternating current power supply, a voltage divider, an alternating current pulse detector, a controller and an upper computer; the method is characterized in that: also includes an antenna; the controller is communicated with the upper computer; the three ultrasonic sensors transmit ultrasonic signals to the controller; an alternating current signal output by the alternating current power supply is processed by the voltage divider and the alternating current pulse detector and then transmitted to the controller; the three ultrasonic sensors are respectively arranged at three different positions on the tested power equipment; the antenna is arranged on the tested electric equipment; the upper computer maps the ultrasonic signals to the alternating current signals to judge the type of the partial discharge fault; the time when the wireless signal generated by the partial discharge reaches the antenna is used as the time when the wireless signal generated by the partial discharge is sent out, so that the time length for transmitting the ultrasonic signal to the three ultrasonic sensors respectively is obtained.
2. An ultrasonic partial discharge detection apparatus according to claim 1, characterized in that: also includes a signal conditioning circuit; the signal regulating circuit is arranged between the ultrasonic sensor and the controller; ultrasonic signals detected by the three ultrasonic sensors are filtered and amplified by the three signal regulating circuits respectively and then transmitted to the controller;
the signal conditioning circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a triode Q1 and an operational amplifier U1; one end of the capacitor C1 is connected with the output end of the corresponding ultrasonic sensor and one end of the capacitor C3, and the other end is connected with one end of the resistor R2, the resistor R6, the resistor R7 and the base electrode of the triode Q1; the other end of the resistor R6 is connected with one end of the resistor R1; the other end of the resistor R1 is connected with one end of the resistor R3 and the anode of an external power supply Vcc; the other end of the resistor R3 is connected with the collector of the triode Q1 and one end of the capacitor C2; the other end of the capacitor C2 is connected with one end of a resistor R5 and one end of a resistor R8; the emitter of the triode Q1 is connected with one end of a resistor R4 and one end of a capacitor C4; the other end of the resistor R8 is connected with one end of a resistor R9 and the inverting input end of the operational amplifier U1; the other end of the resistor R9 is connected with the output end of the operational amplifier U1 and one end of the capacitor C9; the positive input end of the operational amplifier U1 is connected with one end of the resistor R10 and one end of the resistor R11; the power supply end of the operational amplifier U1 is connected with the anode of an external power supply, one end of a capacitor C5 and one end of a capacitor C6, and the ground wire ends are connected with the cathode of the external power supply, one end of a capacitor C7 and the cathode of a capacitor C8; the resistor R7, the resistor R2, the resistor R4, the resistor R5, the resistor R10, the resistor R11, the capacitor C3, the capacitor C5, the other end of the capacitor C7, the capacitor C4, the negative electrode of the capacitor C6 and the positive electrode of the capacitor C8 are all grounded; the output end of the operational amplifier U1 is the signal output end of the signal conditioning circuit 3 and is connected to the analog-to-digital conversion pin of the controller.
3. An ultrasonic partial discharge detection apparatus according to claim 1, characterized in that: the device also comprises an electromagnetic pulse detector; the wireless signal detected by the antenna is processed by the electromagnetic pulse detector and then transmitted to the controller;
preferably, the controller adopts a singlechip; the upper computer adopts a computer.
4. The detecting method of the ultrasonic partial discharge detecting device according to claim 1, characterized in that: the method comprises a fault positioning method and a fault detection method;
the fault positioning method comprises the following specific steps:
step one, establishing a space rectangular coordinate system, and respectively acquiring coordinate values (x) of three ultrasonic sensors in the space rectangular coordinate system1，y1，z1)、(x2，y2，z2)、(x3，y3，z3)；
Step two, when partial discharge occurs at a certain position in the tested electric equipment, the partial discharge part simultaneously emits electromagnetic signals and ultrasonic signals; the time when the antenna receives the electromagnetic signal generated by the partial discharge is taken as the ultrasonic emission time, and timing is started;
respectively recording the time when the three ultrasonic sensors detect that the ultrasonic signals are generated by the partial discharge, and combining the ultrasonic emission time to obtain the time length t required for transmitting the ultrasonic waves emitted by the partial discharge part to the three ultrasonic sensors1、t2、t3；
Establishing an equation set containing position coordinates (x, y, z) of the partial discharge part as shown in the formula (1);
in the formula (1), vsIs the ultrasonic propagation velocity;
solving the formula (1) to obtain the position coordinates (x, y, z) of the partial discharge part;
the fault detection method comprises the following specific steps:
the method comprises the following steps that firstly, multiple groups of calibration tests are carried out on power equipment with different partial discharge fault types, wherein each fault type tests M groups, and M is more than or equal to 10; the process of performing a calibration test on equipment with partial discharge faults is as follows:
1-1, boosting the voltage of the power equipment to enable the power equipment to be tested to generate partial discharge;
1-2. ultrasonic signal V generated by detecting partial discharge by ultrasonic sensor1(t); AC power supply, voltage divider, AC pulse detector generate an AC signal V2(t) to a controller;
1-3, converting the ultrasonic signal and the alternating current signal into a digital signal through a controller and transmitting the digital signal to an upper computer 10;
1-4, the upper computer maps the ultrasonic signals to alternating current signals to generate a phase-resolved partial discharge diagram; calibrating the type of the partial discharge fault according to the phase resolution partial discharge diagram of each power device;
step two, detecting the tested electric equipment, and detecting an ultrasonic signal generated by the partial discharge of the tested electric equipment by using an ultrasonic sensor when the tested electric equipment generates the partial discharge; the alternating current power supply, the voltage divider and the alternating current pulse detector generate an alternating current signal to the controller;
thirdly, the controller converts the ultrasonic signals and the alternating current signals into digital signals and transmits the digital signals to an upper computer;
mapping the ultrasonic partial discharge signal to an alternating current signal by the upper computer to generate a phase-resolved partial discharge diagram; and (4) according to the obtained phase resolution partial discharge diagram, and combining the calibration result in the step one, determining the type of the partial discharge fault of the tested power equipment.
5. The detection method of the ultrasonic partial discharge detection device according to claim 4, characterized in that: the partial discharge failure types include partial discharge caused by oxidation of the element, partial discharge caused by deformation of the element, partial discharge caused by abrasion of the element, and partial discharge caused by the presence of impurities in the element.
6. The detection method of the ultrasonic partial discharge detection device according to claim 4, characterized in that: the calibration process in the first step of the fault detection method is as follows: calculating an average curve from the curves in the M phase-resolved partial discharge graphs of the same group of power equipment; then, taking the average curve as a standard curve for evaluating the fault type; so that each fault type corresponds to a standard curve;
the process of acquiring the partial discharge fault type currently occurring in the tested power equipment in the fourth step of the fault detection method specifically comprises the following steps: respectively subtracting the curves in the phase resolution local discharge diagram from the standard curves obtained in the step one, and taking absolute values to obtain a plurality of difference curves; and taking the fault type partial discharge fault type corresponding to the difference curve with the maximum peak value (namely the maximum value) in each difference curve as the current partial discharge fault type of the tested electric equipment.
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