CN114814497A - Partial discharge detection method, device, equipment, system and storage medium - Google Patents
Partial discharge detection method, device, equipment, system and storage medium Download PDFInfo
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Abstract
The application relates to a partial discharge detection method, a partial discharge detection device, a partial discharge detection system and a storage medium, wherein the partial discharge detection method is applied to the detection system, the detection system comprises a broadband voltage sensor, power equipment and detection equipment, and the broadband voltage sensor of the detection equipment is arranged in the external space of the power equipment of the detection equipment; a coupling capacitor is formed between the detection equipment broadband voltage sensor and a high-voltage bus of detection equipment power equipment, a conductive path is formed between the detection equipment coupling capacitor and the detection equipment broadband voltage sensor, the broadband voltage sensor comprises a low-voltage arm capacitor, and the capacitance value of the low-voltage arm capacitor is located in a preset interval range. The detection equipment acquires the voltage signal of the high-voltage bus acquired by the broadband voltage sensor by using the conductive path, and the voltage signal is used as a partial discharge signal of the power equipment.
Description
Technical Field
The present application relates to the field of power system technologies, and in particular, to a method, an apparatus, a device, a system, and a storage medium for detecting partial discharge.
Background
With the development of power systems and the improvement of voltage levels, partial discharge has become one of the main causes of insulation degradation of power equipment, and the quality of the insulation condition of the power equipment directly affects the safe operation of the power system, so the detection and evaluation of the partial discharge become important means for detecting the insulation condition of the power equipment.
Currently, Ultra High Frequency (UHF) detection methods detect electromagnetic wave signals, which are excited when a power device is partially discharged, by using a UHF sensor, and further analyze the signals to determine a fault type, a fault distance, and the like. Because the metal casing of the power equipment has a strong shielding effect on electromagnetic waves, the UHF sensor can have good anti-interference performance and high sensitivity only by being placed inside the power equipment, but most power transformers do not reserve an installation space for the UHF sensor, and the UHF sensor needs to be installed in an external space of the power equipment, so that the sensitivity of the UHF sensor is low.
Disclosure of Invention
In view of the above, it is desirable to provide a partial discharge detection method, device, apparatus, system, and storage medium capable of improving the partial discharge sensor.
In a first aspect, the present application provides a partial discharge detection method, applied to a detection system, where the detection system includes a broadband voltage sensor, an electrical device, and a detection device, where the broadband voltage sensor is disposed in an external space of the electrical device; a coupling capacitor is formed between the broadband voltage sensor and a high-voltage bus of the power equipment, and a conductive path is formed between the coupling capacitor and the broadband voltage sensor; the broadband voltage sensor comprises a low-voltage arm capacitor, and the capacitance value of the low-voltage arm capacitor is located in a preset interval range; the method comprises the following steps:
the detection equipment acquires a voltage signal of a high-voltage bus of the power equipment, which is acquired by the broadband voltage sensor, by using the conductive path;
the detection device takes the voltage signal as a partial discharge signal of the power device.
In one embodiment, the broadband voltage sensor comprises an induction plate and a low-voltage arm resistor;
the first end of the low-voltage arm capacitor is connected with the first end of the low-voltage arm resistor and the induction pole plate, and the second end of the low-voltage arm capacitor is grounded with the second end of the low-voltage arm resistor.
In one embodiment, the product of the capacitance value of the low-voltage arm capacitor and the resistance value of the low-voltage arm resistor is inversely related to the low-frequency cutoff frequency of the broadband voltage sensor.
In one embodiment, the capacitance value of the low-voltage arm capacitance is inversely related to the sensitivity of the broadband voltage sensor;
the area of the induction polar plate is positively correlated with the size of the coupling capacitor.
In one embodiment, the distance between the sensing plate and the high-voltage bus bar is positively correlated to the size of the coupling capacitor.
In a second aspect, the present application further provides a partial discharge detection method apparatus, which is disposed in a detection device of a detection system, where the detection system includes a broadband voltage sensor, the detection device, and an electrical device, and the broadband voltage sensor is disposed in an external space of the electrical device; a coupling capacitor is formed between the broadband voltage sensor and a high-voltage bus of the power equipment, and a conductive path is formed between the coupling capacitor and the broadband voltage sensor; the broadband voltage sensor comprises a low-voltage arm capacitor, and the capacitance value of the low-voltage arm capacitor is located in a preset interval range; the device comprises:
the acquisition module is used for acquiring voltage signals of a high-voltage bus of the power equipment, which are acquired by the broadband voltage sensor, by using the conductive path;
a determination module to use the voltage signal as a partial discharge signal of the power device.
In a third aspect, the present application further provides a detection apparatus, including a memory and a processor, where the memory stores a computer program, and the processor implements the following steps when executing the computer program:
the detection equipment acquires a voltage signal of a high-voltage bus of the power equipment, which is acquired by the broadband voltage sensor, by using the conductive path;
the detection device takes the voltage signal as a partial discharge signal of the power device.
In a fourth aspect, the present application further provides a detection system, which includes a broadband voltage sensor, an electrical device, and the detection device according to the foregoing embodiments.
In a fifth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of:
the detection equipment acquires a voltage signal of a high-voltage bus of the power equipment, which is acquired by the broadband voltage sensor, by using the conductive path;
the detection device takes the voltage signal as a partial discharge signal of the power device.
In a sixth aspect, the present application further provides a computer program product comprising a computer program that when executed by a processor performs the steps of:
the detection equipment acquires a voltage signal of a high-voltage bus of the power equipment, which is acquired by the broadband voltage sensor, by using the conductive path;
the detection device takes the voltage signal as a partial discharge signal of the power device.
The partial discharge detection method, the partial discharge detection device, the detection equipment, the detection system and the storage medium are applied to a detection system, the detection system of the detection equipment comprises a broadband voltage sensor, electric equipment and detection equipment, and the broadband voltage sensor of the detection equipment is arranged in an external space of the electric equipment of the detection equipment; a coupling capacitor is formed between the detection equipment broadband voltage sensor and a high-voltage bus of detection equipment power equipment, a conductive path is formed between the detection equipment coupling capacitor and the detection equipment broadband voltage sensor, the broadband voltage sensor comprises a low-voltage arm capacitor, and the capacitance value of the low-voltage arm capacitor is located in a preset interval range. The method comprises the steps that the broadband voltage sensor is placed near the high-voltage bus, the partial discharge signal of the power equipment can be detected only by obtaining the voltage signal on the high-voltage bus of the power equipment, and the problem of low sensitivity caused by the fact that the ultrahigh-frequency sensor is placed in the outer space of the power equipment is solved as long as the low-voltage arm capacitor is located in a preset interval range. And the method has no requirement of high broadband of the ultrahigh frequency sensor on the detection equipment, thereby reducing the use cost.
Drawings
FIG. 1 is a diagram of an exemplary embodiment of a partial discharge detection method;
FIG. 2 is a schematic flow chart of a partial discharge detection method according to an embodiment;
FIG. 3 is a schematic diagram of a three-capacitor equivalent model of partial discharge in one embodiment;
FIG. 4 is a schematic diagram illustrating the variation of the gap voltage during gap discharge in one embodiment;
FIG. 5 is a schematic diagram illustrating the variation of the gap voltage during gap discharge in another embodiment;
FIG. 6 is a diagram of a low frequency equivalent circuit of the broadband voltage sensor in one embodiment;
FIG. 7 is a schematic illustration of a partial discharge test platform according to an embodiment;
FIG. 8 is a graph showing the results of a partial discharge test in one embodiment;
FIG. 9 is a partial discharge energy spectrum according to an embodiment;
FIG. 10 is a block diagram showing the structure of a partial discharge detection apparatus according to an embodiment;
FIG. 11 is an internal block diagram of a detection device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The partial discharge detection method provided by the embodiment of the application can be applied to the application environment shown in fig. 1. The application environment comprises power equipment (a high-voltage bus led out by the power equipment), a broadband voltage sensor (a low-voltage arm) and detection equipment (a digital oscilloscope), wherein the broadband voltage sensor (the low-voltage arm) is connected with the detection equipment (the digital oscilloscope) through a coaxial cable (a dotted frame part in the figure), and the detection of the partial discharge of the power equipment is realized by acquiring a voltage signal on the high-voltage bus collected by the broadband voltage sensor (the low-voltage arm).
The detection of the partial discharge is based on various phenomena caused by the partial discharge, and the state of the partial discharge is represented by a physical quantity capable of expressing the phenomena. In addition to the transfer of electric charge and the loss of electric energy, electric pulses, electromagnetic radiation, ultrasound, light and the generation of new products are also generated during the partial discharge of the electrical equipment, which causes local overheating. Accordingly, various detection methods such as an electric pulse detection method, an ultrasonic detection method, a photometric method, a chemical detection method, and an infrared detection method have appeared.
The pulse current method has many advantages compared with a non-electrical measurement method, and is widely popularized and applied, but the pulse current method has low measurement frequency, narrow frequency band, less information content and weaker anti-interference capability, so that an ultrahigh frequency detection method capable of effectively solving the problems is rapidly developed in recent years. The theoretical basis of the ultrahigh frequency method is that electromagnetic waves are excited when power equipment is in partial discharge, the frequency of the electromagnetic waves can reach GHz level at most, and electromagnetic signals with the frequency can be received by the antenna sensor, so that the signals are further analyzed, and the fault type, the fault distance and the like are judged. The ultrahigh frequency method has the measuring frequency up to GHz, which is far higher than the frequency of interference signals in the environment where the electrical equipment is located under the ordinary condition, so that low-frequency interference noise under the conventional condition can be well avoided. However, the metal casing of the power equipment has a strong shielding effect on the ultrahigh frequency electromagnetic waves, so that the ultrahigh frequency sensor has good anti-interference performance and high sensitivity only by being placed inside the equipment, most of the power equipment does not reserve an installation space for the ultrahigh frequency sensor, and the ultrahigh frequency sensor needs to be installed in an external space of the power equipment, so that the sensitivity of the ultrahigh frequency sensor is low. In addition, the ultrahigh frequency sensor has high manufacturing requirements and needs high-bandwidth sampling equipment, so that the use cost of the ultrahigh frequency sensor is high. Therefore, the present application provides a partial discharge detection method, device, apparatus, system, and storage medium that can effectively solve the problems of low sensitivity and high cost of the uhf sensor.
In an embodiment, as shown in fig. 2, a partial discharge detection method is provided, which is applied to a detection system, where the detection system includes a broadband voltage sensor, a power device, and a detection device, the broadband voltage sensor is disposed in an external space of the power device, a coupling capacitor is formed between the broadband voltage sensor and a high-voltage bus of the power device, a conductive path is formed between the coupling capacitor and the broadband voltage sensor, the broadband voltage sensor includes a low-voltage arm capacitor, and a capacitance value of the low-voltage arm capacitor is located in a preset interval range, which is exemplified by applying the method to the detection device in fig. 1, and includes the following steps:
s201, the detection device acquires voltage signals of a high-voltage bus of the power equipment, which are acquired by the broadband voltage sensor, by using the conductive path.
Optionally, the detection device may be an oscilloscope, or may be a computer device equipped with an acquisition card, or the like.
The preset interval may be 20-30 picofarads, 40-50 picofarads, etc., which is not limited in the embodiment of the present application, and preferably, the preset interval may be 25-35 picofarads.
In this embodiment, a broadband voltage sensor is disposed in an external space of an electrical device, the broadband voltage sensor is disposed at a position of a sufficient insulation distance of a high-voltage bus led out from the electrical device, the broadband voltage sensor couples signals on the high-voltage bus, a coupling capacitor is formed between the broadband voltage sensor and the high-voltage bus, a conductive path is formed between the coupling capacitor and the broadband voltage sensor, the broadband voltage sensor and a detection device are connected by a coaxial cable, and the detection device obtains a high-frequency voltage signal of the high-voltage bus of the electrical device collected by the broadband voltage sensor by using the conductive path.
And S202, the detection device takes the high-frequency voltage signal as a partial discharge signal of the power device.
In the present embodiment, based on the analysis of the principle of partial discharge, the mechanism of partial discharge can be explained by a three-capacitor model, as shown in FIG. 3, where C is g Represents the air gap capacitance, C b Is an electrolyte capacitor, C, in series with an air-gap capacitor m To remove C b 、C g Capacitors other than those with intact insulation, typically C m >>C g >>C b . Due to air gap capacitance C g At a lower voltage U g The discharge is started at the time of (discharge voltage), so that the equivalent ground is used for the discharge gap g and the air-gap capacitor C g Expressed in parallel, the total capacitance of the resulting electrode is:
e.g. by adding an instantaneous value u to the electrodes t The alternating voltage of (2), then the air-gap capacitance C g Divided up instantaneous voltage value u g Can be expressed as:
as shown in fig. 4, the instantaneous voltage value u on the air-gap capacitance g Dependent on the ac voltage u t Continuously increasing as the instantaneous voltage value u g Reaches its discharge voltage U g Time, air gap capacitance C g Starting discharge, generating spark discharge in the air gap, and discharging the air gap capacitor C g Instantaneous voltage value u of g Sharply decreases while the dielectric capacitance C b Is charged by g. When the instantaneous voltage value u g Down to U r When the voltage is applied, the discharge is immediately extinguished, but the AC voltage u is applied t Also rising, air gap capacitance C g The voltage on the capacitor is charged into U g Air gap capacitance C g A second discharge is initiated. When the alternating voltage u t Continuously increased and reaches the peak value of the alternating voltage u t Reduced and distributed in the air gap capacitance C g The voltage on is correspondingly reduced when the alternating voltage u t Is already low to a certain extent, it will be lower than the electrolyte capacitance C b At the air gap capacitance C g Charged voltage during discharge, electrolyte capacitance C b To the air gap capacitance C g Reverse charging to make the air gap capacitance C g Instantaneous voltage value u of g to-U g Air gap capacitance C g Discharge begins to form again, and after the discharge, the air gap capacitance C g Voltage on to-U r The discharge is extinguished. With applied AC voltage u t Is continuously reduced, the air-gap capacitance C g The instantaneous voltage value on reaches-U again g When the discharge is started, the discharge is started again. Therefore, the partial discharge will occur repeatedly a plurality of times within one ac cycle.
For the amount of discharge charge and the discharge energy. Assuming air gap capacitance C g At the point of reaching U g Discharge is started at any time, and the air gap capacitance C g The voltage on the capacitor drops sharply to U r (office)Residual voltage on the air gap when partial discharge is extinguished), the power supply does not immediately replenish charge due to inductance on the loop, and so on, and then the voltage fluctuates (U) g -U r ) Time, via air gap capacitance C g Full capacitance of discharge
The discharge charge amount of (a) is:
wherein q is r Is a real discharge, but due to C g 、C b 、C m Etc. cannot be measured, therefore q r Nor can it be measured.
The air gap voltage variation (Ug-Ur) caused by air gap discharge is divided into C b And C m Above, if Δ U is given in C m The upper part, as shown in FIG. 5, C m The voltage above is lower than the supply voltage by Δ U, the supply charging will form a current pulse in the loop, and the following relationship:
in addition, the total capacitance between the electrodes is C when viewed from the power supply side a Then the product of the two can also be taken to represent the discharge charge q, i.e.:
q＝C a ΔU＝C b (U g -U r )
q is called the apparent discharge. It follows that the Δ U between the electrodes due to the air gap discharge is proportional to the apparent amount of discharge. If this Δ U can be measured, the purpose of measuring the partial discharge signal is achieved, and therefore, the voltage signal can be used as the partial discharge signal of the power equipment.
The partial discharge detection method is applied to a detection system, the detection equipment detection system comprises a broadband voltage sensor, electric equipment and detection equipment, and the broadband voltage sensor of the detection equipment is arranged in the external space of the electric equipment of the detection equipment; a coupling capacitor is formed between the detection equipment broadband voltage sensor and a high-voltage bus of detection equipment power equipment, a conductive path is formed between the detection equipment coupling capacitor and the detection equipment broadband voltage sensor, the broadband voltage sensor comprises a low-voltage arm capacitor, and the low-voltage arm capacitor is located in a preset interval range. The method comprises the steps that the broadband voltage sensor is placed near the high-voltage bus, the partial discharge signal of the power equipment can be detected only by obtaining the voltage signal on the high-voltage bus of the power equipment, and the problem of low sensitivity caused by the fact that the ultrahigh-frequency sensor is placed in the outer space of the power equipment is solved as long as the low-voltage arm capacitor is located in a preset interval range. And the method has no requirement of high broadband of the ultrahigh frequency sensor on the detection equipment, thereby reducing the use cost.
FIG. 6 is a low frequency equivalent circuit diagram of a broadband voltage sensor according to an embodiment, as shown in FIG. 6, the broadband voltage sensor includes a sensing plate, a low-arm capacitor, and a low-arm resistor; the first end of the low-voltage arm capacitor is connected with the first end of the low-voltage arm resistor and the induction polar plate, and the second end of the low-voltage arm capacitor and the second end of the low-voltage arm resistor are grounded.
In this embodiment, as shown in fig. 6, the low-voltage arm capacitor C L One end of the low-voltage arm resistor R is connected with the induction polar plate, the other end of the low-voltage arm resistor R is connected with the reference ground D One end of the same is connected with the induction polar plate, and the other end is connected with the reference ground (low-voltage arm resistor R) D In parallel with the low-voltage arm capacitor C L )。
Optionally, the low-voltage arm capacitor can be a patch capacitor, a plug-in capacitor, a ceramic dielectric capacitor, a polyester capacitor and the like, and the low-voltage arm capacitor welding mode, materials and the like are not limited in the application.
Optionally, the low-voltage arm resistor may be a chip resistor, a plug-in resistor, a winding resistor, a thin-film resistor, or the like, which is not limited in this application.
Further, a low-voltage arm capacitor C L May include multiple capacitors, low voltage arm resistor R D The broadband voltage sensor can comprise a plurality of resistors, a plurality of capacitors are connected in parallel, and a plurality of resistors are connected in parallel, so that the bandwidth of the broadband voltage sensor can be further improved.
In this embodiment, the broadband voltage sensor includes an induction pole plate, a low-voltage arm capacitor, and a low-voltage arm resistor; the first end of the low-voltage arm capacitor and the first end of the low-voltage arm resistor are connected with the induction pole plate, and the second end of the low-voltage arm capacitor and the second end of the low-voltage arm resistor are grounded.
In one embodiment, the area of the sensing plate is positively correlated with the size of the coupling capacitor, and the distance between the sensing plate and the high-voltage bus is positively correlated with the size of the coupling capacitor.
In this embodiment, the capacitance of the coupling capacitor formed between the sensing plate of the broadband voltage sensor and the high-voltage bus is much smaller than the capacitance of the low-voltage arm capacitor. The area of the induction polar plate is positively correlated with the size of the coupling capacitor, the larger the area of the induction polar plate is, the better the area of the induction polar plate is, and the larger the area of the induction polar plate can improve the sensitivity of the sensor.
In this embodiment, the distance between the sensing electrode plate and the high-voltage bus is determined by the voltage level, and the distance between the sensing electrode plate and the high-voltage bus is positively correlated to the size of the coupling capacitor. Therefore, the closer the distance between the sensing plate and the high-voltage bus bar, the better, the enough safe insulation distance is kept from the high-voltage bus bar.
In one embodiment, the capacitance value of the low-arm capacitor is inversely related to the sensitivity of the broadband voltage sensor, and the product of the capacitance value of the low-arm capacitor and the resistance value of the low-arm capacitor is inversely related to the low-frequency cutoff frequency of the broadband voltage sensor.
In this embodiment, because the voltage fluctuation Δ U has a high frequency and a small amplitude, if the voltage fluctuation Δ U generated by the partial discharge needs to be measured, the sensor needs to have a high sensitivity and to filter the interference of the power frequency voltage. As shown in FIG. 6, the capacitance of the coupling capacitor is much smaller than the low voltageThe capacitance value of the arm capacitor and the low-voltage arm resistor are far smaller than the internal resistance of the detection equipment (the internal resistance R of the oscilloscope) O ) Therefore, the calculation formula of the low-frequency cut-off frequency of the available broadband voltage sensor is as follows:
the sensitivity of the sensor is generally improved by reducing the capacitance C of the low-voltage arm L And the low-frequency cut-off frequency of the sensor needs to be increased to filter the interference of the power frequency voltage. From the above formula, C is reduced L And R D The product of (c) may increase the low frequency cutoff frequency of the sensor. In general, to obtain sufficiently high sensitivity, C L The value of (A) is generally several tens of picofarads, R D The value of (a) is typically several hundred ohms and the low frequency cut-off frequency of the sensor is typically around 100 kHz.
In the embodiment of the application, the capacitance value of the low-voltage arm capacitor is inversely related to the sensitivity of the broadband voltage sensor, the product result of the capacitance value of the low-voltage arm capacitor and the resistance value of the low-voltage arm resistor is limited in the method, the broadband voltage sensor can have a low frequency cut-off frequency which is high enough, the broadband voltage sensor is guaranteed to have high sensitivity, the interference of power frequency voltage can be filtered, and high-frequency components are reserved.
In one embodiment, the partial discharge type can be determined by analyzing the measured partial discharge signal in time domain and frequency spectrum. The size of an induction polar plate of the broadband voltage sensor is 10cm multiplied by 10cm, the capacitance value of a low-voltage arm is 28pF, the resistance value of the low-voltage arm is 560 omega, the low-frequency cut-off frequency of the broadband voltage sensor is 101.5kHz, and a sample is 1mm of insulating oil paper. On the experimental platform shown in fig. 7, partial discharge signals under typical defects were measured by using a non-inductive resistor (pulse current method) and the broadband voltage sensor of the present application (i.e., the partial discharge sensor in fig. 7), respectively, wherein the experimental results under different electrodes are shown in fig. 8. In fig. 8, (a) is the results of the pin-plate electrode experiment, (b) is the results of the plate-plate electrode experiment, (c) is the results of the in-plane weak vertical component electrode experiment, and (d) is the results of the in-plane strong vertical component electrode experiment. Further, the partial discharge signal measured by using the non-inductive resistor (pulse current method) and the broadband voltage sensor of the present application (i.e. the partial discharge sensor in fig. 7) is subjected to spectrum analysis, the energy spectrum distribution is shown in fig. 9, where (a) is an energy spectrum distribution diagram (non-inductive resistance) of the needle-plate electrode, (b) is an energy spectrum distribution diagram (partial discharge sensor) of the needle-plate electrode, (c) is an energy spectrum distribution diagram (non-inductive resistance) of the plate-plate electrode, (d) is an energy spectrum distribution diagram (partial discharge sensor) of the plate-plate electrode, (e) is an energy spectrum distribution diagram (non-inductive resistance) of the weak vertical component along the plane, (f) is an energy spectrum distribution diagram (partial discharge sensor) of the weak vertical component along the plane, (g) is an energy spectrum distribution diagram (non-inductive resistance) of the strong vertical component along the plane, and (h) is an energy spectrum distribution diagram (partial discharge sensor) of the strong vertical component along the plane. It can be found that for different types of partial discharge, the energy is concentrated at lower frequency in the energy spectrum of the discharge signal measured by using the non-inductive resistor (pulse current method). The bandwidth of the broadband voltage sensor (partial discharge sensor) is higher, more information can be obtained, and a needle-plate electrode discharge signal has a larger high-frequency energy peak; the discharge energy of the plate-plate electrodes is concentrated at lower frequency; discharging along the surface weak vertical component electrode, and having a small amount of high-frequency energy; when the electrode discharges along the surface strong vertical component, the high-frequency energy is larger, and the frequency distribution is very wide.
According to (a), (c), (e) and (g) of the partial discharge energy spectrum shown in fig. 9, it can be seen that the energy spectrum density graphs of the gap-free pin plate, the gap-free pin plate and the along-the-plane pin plate discharge signal containing weak vertical components measured by the pulse current method are similar, the energy spectrum density is mainly concentrated between 10 MHz and 20MHz, and the energy density above 50MHz is low. The energy spectrum density of the discharge signal containing strong vertical components along the needle plate is mainly concentrated between 50MHz and 100MHz, and the energy density below 40MHz and above 100MHz is low.
Similarly, as can be seen from (b), (d), (f) and (h) in fig. 9, for the gap-free pin plate discharge, the energy of the signal measured by the partial discharge sensor is distributed in the range of 100-500 MHz, except that the density is higher in 100MHz, and the energy density is higher at some frequency points. For the plate discharge without the gap, the signal energy measured by the partial discharge sensor is mainly distributed similarly to the pulse current method and is mainly concentrated within 50 MHz. For the discharge signal along the surface pin plate containing strong vertical component, the distribution range of the energy of the partial discharge signal is similar to that of the discharge of the pin plate without oil gap, but compared with the discharge of the pin plate without oil gap, the energy distribution is more continuous, and the energy distribution ratio above 200MHz is higher. For the discharge signal along the surface needle plate containing weak vertical component, the energy is mainly distributed within 100MHz, and the energy density is lower at higher frequency and is only distributed at fewer frequency points.
It should be understood that, although the steps in the flowcharts related to the embodiments as described above are sequentially displayed as indicated by arrows, the steps are not necessarily performed sequentially as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in the flowcharts related to the embodiments described above may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the execution order of the steps or stages is not necessarily sequential, but may be rotated or alternated with other steps or at least a part of the steps or stages in other steps.
Based on the same inventive concept, the embodiment of the present application further provides a partial discharge detection apparatus for implementing the above-mentioned partial discharge detection method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so specific limitations in one or more embodiments of the partial discharge detection device provided below can be referred to the limitations of the partial discharge detection method in the foregoing, and details are not described here.
In one embodiment, as shown in fig. 10, there is provided a partial discharge detection apparatus, which is disposed in a detection device of a detection system, the detection system includes a broadband voltage sensor, the detection device, and an electric device, the broadband voltage sensor is disposed in an external space of the electric device; a coupling capacitor is formed between the broadband voltage sensor and a high-voltage bus of the power equipment, and a conductive path is formed between the coupling capacitor and the broadband voltage sensor; the broadband voltage sensor comprises a low-voltage arm capacitor, and the capacitance value of the low-voltage arm capacitor is located in a preset interval range; the detection device includes: an obtaining module 11 and a determining module 12, wherein:
the acquisition module 11 is configured to acquire a voltage signal of a high-voltage bus of the power equipment, which is acquired by the broadband voltage sensor, through the conductive path;
and the determining module 12 is used for taking the voltage signal as a partial discharge signal of the power equipment.
The modules in the partial discharge detection device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a detection device is provided, which may be a terminal, and the internal structure thereof may be as shown in fig. 11. The detection device comprises a processor, a memory, a communication interface, a display screen and an input device which are connected through a system bus. Wherein the processor of the detection device is configured to provide computational and control capabilities. The memory of the detection device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the detection device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a partial discharge detection method. The display screen of the detection device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the detection device can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the detection device, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 11 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, there is provided a detection apparatus comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the following steps when executing the computer program:
the detection equipment acquires a voltage signal of a high-voltage bus of the power equipment, which is acquired by a broadband voltage sensor, by using a conductive path;
the detection device takes the voltage signal as a partial discharge signal of the power device.
In one embodiment, the broadband voltage sensor comprises an induction plate, a low-voltage arm capacitor and a low-voltage arm resistor;
the first end of the low-voltage arm capacitor is connected with the first end of the low-voltage arm resistor and the induction polar plate, and the second end of the low-voltage arm capacitor and the second end of the low-voltage arm resistor are grounded.
In one embodiment, the product of the capacitance value of the low-arm capacitance and the resistance value of the low-arm resistance is inversely related to the low-frequency cutoff frequency of the broadband voltage sensor.
In one embodiment, the capacitance value of the low-arm capacitance is inversely related to the sensitivity of the broadband voltage sensor; the area of the induction polar plate is positively correlated with the size of the coupling capacitor.
In one embodiment, the distance between the sensing plate and the high voltage bus bar is positively correlated to the size of the coupling capacitor.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
the detection equipment acquires voltage signals of a high-voltage bus of the power equipment, which are acquired by the broadband voltage sensor, by using the conductive path;
the detection device takes the voltage signal as a partial discharge signal of the power device.
In one embodiment, a broadband voltage sensor includes an inductive plate, a low-arm capacitance, and a low-arm resistance;
the first end of the low-voltage arm capacitor is connected with the first end of the low-voltage arm resistor and the induction polar plate, and the second end of the low-voltage arm capacitor and the second end of the low-voltage arm resistor are grounded.
In one embodiment, the product of the capacitance value of the low-arm capacitance and the resistance value of the low-arm resistance is inversely related to the low-frequency cutoff frequency of the broadband voltage sensor.
In one embodiment, the capacitance value of the low-arm capacitance is inversely related to the sensitivity of the broadband voltage sensor; the area of the induction polar plate is positively correlated with the size of the coupling capacitor.
In one embodiment, the distance between the sensing plate and the high voltage bus bar is positively correlated to the size of the coupling capacitor.
In one embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, performs the steps of:
the detection equipment acquires voltage signals of a high-voltage bus of the power equipment, which are acquired by the broadband voltage sensor, by using the conductive path;
the detection device takes the voltage signal as a partial discharge signal of the power device.
In one embodiment, a broadband voltage sensor includes an inductive plate, a low-arm capacitance, and a low-arm resistance;
the first end of the low-voltage arm capacitor is connected with the first end of the low-voltage arm resistor and the induction polar plate, and the second end of the low-voltage arm capacitor and the second end of the low-voltage arm resistor are grounded.
In one embodiment, the product of the capacitance value of the low-arm capacitance and the resistance value of the low-arm resistance is inversely related to the low-frequency cutoff frequency of the broadband voltage sensor.
In one embodiment, the capacitance value of the low-arm capacitance is inversely related to the sensitivity of the broadband voltage sensor; the area of the induction polar plate is positively correlated with the size of the coupling capacitor.
In one embodiment, the distance between the sensing plate and the high voltage bus bar is positively correlated to the size of the coupling capacitor.
It should be noted that, the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, presented data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include a Read-Only Memory (ROM), a magnetic tape, a floppy disk, a flash Memory, an optical Memory, a high-density embedded nonvolatile Memory, a resistive Random Access Memory (ReRAM), a Magnetic Random Access Memory (MRAM), a Ferroelectric Random Access Memory (FRAM), a Phase Change Memory (PCM), a graphene Memory, and the like. Volatile Memory can include Random Access Memory (RAM), external cache Memory, and the like. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others. The databases referred to in various embodiments provided herein may include at least one of relational and non-relational databases. The non-relational database may include, but is not limited to, a block chain based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, quantum computing based data processing logic devices, etc., without limitation.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (10)
1. The partial discharge detection method is applied to a detection system, wherein the detection system comprises a broadband voltage sensor, electric equipment and detection equipment, and the broadband voltage sensor is arranged in an external space of the electric equipment; a coupling capacitor is formed between the broadband voltage sensor and a high-voltage bus of the power equipment, and a conductive path is formed between the coupling capacitor and the broadband voltage sensor; the broadband voltage sensor comprises a low-voltage arm capacitor, and the capacitance value of the low-voltage arm capacitor is located in a preset interval range; the method comprises the following steps:
the detection equipment acquires a voltage signal of a high-voltage bus of the power equipment, which is acquired by the broadband voltage sensor, by using the conductive path;
the detection device takes the voltage signal as a partial discharge signal of the power device.
2. The method of claim 1, wherein the broadband voltage sensor further comprises an inductive pad and a low-arm resistor;
the first end of the low-voltage arm capacitor is connected with the first end of the low-voltage arm resistor and the induction pole plate, and the second end of the low-voltage arm capacitor is grounded with the second end of the low-voltage arm resistor.
3. The method of claim 2, wherein a product of a capacitance value of the low-voltage arm capacitance and a resistance value of the low-voltage arm resistance is inversely related to a low-frequency cutoff frequency of the broadband voltage sensor.
4. The method of claim 2, wherein a capacitance value of the low-side arm capacitance is inversely related to a sensitivity of the broadband voltage sensor;
the area of the induction polar plate is positively correlated with the size of the coupling capacitor.
5. The method of claim 4, wherein a distance between the sensing plate and the high voltage bus bar is positively correlated to a magnitude of the coupling capacitance.
6. The partial discharge detection device is characterized by being arranged on detection equipment of a detection system, wherein the detection system comprises a broadband voltage sensor, the detection equipment and power equipment, and the broadband voltage sensor is arranged in an external space of the power equipment; a coupling capacitor is formed between the broadband voltage sensor and a high-voltage bus of the power equipment, and a conductive path is formed between the coupling capacitor and the broadband voltage sensor; the broadband voltage sensor comprises a low-voltage arm capacitor, and the capacitance value of the low-voltage arm capacitor is located in a preset interval range; the device comprises:
the acquisition module is used for acquiring the voltage signal of the high-voltage bus of the power equipment, which is acquired by the broadband voltage sensor, by using the conductive path;
a determination module to use the voltage signal as a partial discharge signal of the power device.
7. A detection device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor realizes the steps of the method according to any of claims 1-5 when executing the computer program.
8. A detection system comprising a broadband voltage sensor, a power device, and the detection device of claim 7.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
10. A computer program product comprising a computer program, characterized in that the computer program realizes the steps of the method of any one of claims 1-5 when executed by a processor.
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| CN117909911A (en) * | 2024-03-19 | 2024-04-19 | 江苏征途电气科技有限公司 | Electrical equipment partial discharge abnormality detection method based on artificial intelligence |
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| CN117909911A (en) * | 2024-03-19 | 2024-04-19 | 江苏征途电气科技有限公司 | Electrical equipment partial discharge abnormality detection method based on artificial intelligence |
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