CN112379232A - High-frequency partial discharge sensing circuit, device and high-frequency partial discharge detection system - Google Patents
High-frequency partial discharge sensing circuit, device and high-frequency partial discharge detection system Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
Abstract
The invention relates to a high-frequency partial discharge sensing circuit, a device and a high-frequency partial discharge detection system. The first end of the isolation unit is connected with the second end of the first capacitor, when the isolation unit is used, the first end of the first capacitor is connected with the power equipment to be tested, and the second end of the isolation unit is connected with the partial discharge detection unit. The isolation unit is used for isolating the power frequency signal and the high-frequency partial discharge signal which pass through the first capacitor, so that the partial discharge detection unit detects the high-frequency partial discharge signal of the power equipment to be detected. According to the high-frequency partial discharge sensing circuit, the power frequency signal and the high-frequency partial discharge signal are isolated through the isolation unit, so that when the partial discharge detection unit is used for detecting the partial discharge signal, the interference of the power frequency signal is avoided, and the accuracy of detecting the high-frequency partial discharge signal can be improved.
Description
Technical Field
The invention relates to the technical field of power equipment detection, in particular to a high-frequency partial discharge sensing circuit, a high-frequency partial discharge sensing device and a high-frequency partial discharge detection system.
Background
Through detecting the partial discharge signal of power equipment to analysis partial discharge development trend can judge whether there is the ageing speed of local defect and medium in the power equipment to even the maintenance personal intervenes, prevent the huge loss that destructive discharge caused, have important meaning to the steady operation of guarantee power equipment.
In the conventional technology, a high-voltage live display device is adopted to detect the live condition of power equipment, however, a capacitive coupling sensor in the high-voltage live display device is mainly used for detecting a power frequency voltage signal of the power equipment, and the high-voltage live display device is used for detecting a partial discharge signal inaccurately.
Disclosure of Invention
In view of the above, it is necessary to provide a high frequency partial discharge sensing circuit, a device and a high frequency partial discharge detection system.
In one aspect, an embodiment of the present application provides a high frequency partial discharge sensing circuit, including:
the first end of the first capacitor is used for being connected with the power equipment to be tested;
the first end of the isolation unit is connected with the second end of the first capacitor, the second end of the isolation unit is used for being connected with the partial discharge detection unit, and the isolation unit is used for isolating a power frequency signal and a high-frequency partial discharge signal passing through the first capacitor so that the partial discharge detection unit detects the high-frequency partial discharge signal of the power equipment to be detected.
In one embodiment, the isolation unit includes:
the first end of the second capacitor is connected with the second end of the first capacitor, and the second end of the second capacitor is used for being connected with the partial discharge detection unit;
and the first end of the inductor is connected with the first end of the second capacitor, and the second end of the inductor is used for grounding.
In one embodiment, the method further comprises the following steps:
and the protection unit is connected with the isolation unit in parallel and is used for protecting the high-frequency partial discharge sensing circuit.
In one embodiment, the protection unit includes:
the first end of the transient diode is connected with the first end of the isolation unit, and the second end of the transient diode is used for grounding;
the voltage dependent resistor is connected with the transient diode in parallel and used for shunting;
and the gas discharge tube is connected with the piezoresistor in parallel and used for discharging current to the ground.
In another aspect, an embodiment of the present application provides a high frequency partial discharge sensing apparatus, including:
a housing provided with an accommodating chamber;
the first nut is arranged at the first end of the shell and used for being connected with the power equipment to be tested;
the second nut is arranged at the second end of the shell and used for grounding the high-frequency partial discharge sensing device;
the circuit board is arranged in the accommodating cavity;
the high-frequency partial discharge sensing circuit provided in the above embodiment;
the first capacitor of the high-frequency partial discharge sensing circuit is arranged in the accommodating cavity and arranged between the first nut and the second nut, and the isolation unit is welded on the circuit board.
In one embodiment, the method further comprises the following steps:
and the radio frequency terminal is connected with the high-frequency partial discharge sensing circuit and is used for connecting the high-frequency partial discharge sensing device with the partial discharge detection unit.
In one embodiment, the radio frequency terminal is an SMA radio frequency terminal.
In one embodiment, the shell is made by epoxy resin pouring.
In another aspect, an embodiment of the present application further provides a high-frequency partial discharge detection system, including:
the high-frequency partial discharge sensing device provided in the above embodiment;
and the partial discharge detection unit is connected with the high-frequency partial discharge sensing circuit and used for detecting a high-frequency partial discharge signal of the power equipment to be detected.
In one embodiment, the partial discharge detection unit is connected with the high-frequency partial discharge sensing device through a radio frequency cable.
The application provides a high-frequency partial discharge sensing circuit, a device and a high-frequency partial discharge detection system. The first end of the first capacitor is used for being connected with the power equipment to be tested, the second end of the first capacitor is connected with the first end of the isolation unit, and the second end of the isolation unit is used for being connected with the partial discharge detection unit. The isolation unit is used for isolating a power frequency signal and a high-frequency partial discharge signal which pass through the first capacitor, so that the partial discharge detection unit detects the high-frequency partial discharge signal of the power equipment to be detected. In this application, keep apart power frequency signal and high frequency partial discharge signal through isolation unit for when using partial discharge detecting element to detect the high frequency partial discharge signal of the electrical equipment that awaits measuring, can not receive power frequency signal's interference, thereby can improve the accuracy to high frequency partial discharge signal detection.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the description of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a high-frequency partial discharge sensing circuit according to an embodiment of the present application;
fig. 2 is an equivalent circuit diagram for detecting a high-frequency partial discharge signal of an electrical device under test by using a pulse current method according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a high frequency partial discharge sensing circuit according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a high frequency partial discharge sensing circuit according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a high frequency partial discharge sensing circuit according to an embodiment of the present application;
FIG. 6 is a schematic structural diagram of a high-frequency partial discharge sensing device according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a high-frequency partial discharge detection system according to an embodiment of the present application.
Description of reference numerals:
10. a high frequency partial discharge sensing circuit; 11. power equipment to be tested; 20. a partial discharge detection unit; 30. a high frequency partial discharge sensing device; 31. a housing; 32. a first nut; 33. a second nut; 34. a circuit board; 35. an accommodating chamber; 36. a radio frequency terminal; 40. a high frequency partial discharge detection system; 100. a first capacitor; 200. an isolation unit; 210. a second capacitor; 220. an inductance; 300. a protection unit; 310. a transient diode; 320. a voltage dependent resistor; 330. a gas discharge tube.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
The following describes the technical solutions of the present application and how to solve the technical problems with the technical solutions of the present application in detail with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
The high-frequency partial discharge sensing circuit provided by the application can be applied to a partial discharge detection unit for detecting power equipment by adopting a pulse current method. The high-frequency partial discharge sensing circuit transmits a high-frequency partial discharge signal generated when the partial discharge phenomenon occurs to the power equipment to be detected to the partial discharge detection unit, so that the high-frequency partial discharge signal of the power equipment to be detected can be detected.
Referring to fig. 1, an embodiment of the present application provides a high frequency partial discharge sensing circuit 10 including a first capacitor 100 and an isolation unit 200. The first capacitor 100 includes a first terminal and a second terminal. The isolation unit 200 includes a first end and a second end. A first end of the first capacitor 100 is used for connecting with the power device 11 to be tested. A first terminal of the isolation unit 200 is connected to a second terminal of the first capacitor 100. In use, the second terminal of the isolation unit 200 is connected to the partial discharge detection unit 20. The isolation unit 200 is configured to isolate the power frequency signal and the high-frequency partial discharge signal passing through the first capacitor 100, so that the partial discharge detection unit 20 detects the high-frequency partial discharge signal of the power device 11 to be detected.
In use, a first end of the first capacitor 100 is connected to the power device under test 11. When the partial discharge phenomenon occurs in the power equipment 11 to be measured, the power frequency signal and the high-frequency partial discharge signal of the power equipment 11 to be measured pass through the first capacitor 100. Wherein, the power frequency signal refers to a related current or voltage signal with a conventional frequency of 50 Hz; the high-frequency partial discharge signal is a current or voltage signal generated when the power device 11 under test generates a partial discharge phenomenon. The first capacitor 100 may be a coupling capacitor, which is a coupling manner generated due to the existence of distributed capacitors, and through the coupling capacitor, the strong current system and the weak current system can be capacitively coupled and isolated, so as to provide a high-frequency signal path and prevent low-frequency current from entering the weak current system. Meanwhile, the coupling capacitor can also extract power frequency signals. In other words, when the power device 11 to be tested generates a partial discharge signal, and a low-frequency signal, a power-frequency signal, and a high-frequency partial discharge signal generated by the power device 11 to be tested pass through the first capacitor 100, the first capacitor 100 may block the low-frequency signal, that is, only the power-frequency signal and the high-frequency partial discharge signal that enter the isolation unit 200 through the first capacitor 100. The present embodiment does not limit the specific type, value, and the like of the first capacitor 100, as long as the function thereof can be realized.
After receiving the power frequency signal and the high-frequency partial discharge signal through the first capacitor 100, the isolation unit 200 can isolate the power frequency signal from the high-frequency partial discharge signal, so that the high-frequency partial discharge signal is transmitted to the partial discharge detection unit 20 through the second end of the isolation unit 200. The partial discharge detection unit 20 can acquire the partial discharge condition of the power device under test 11 by detecting the high-frequency partial discharge signal. The present embodiment does not set any limitation to the specific structure of the isolation unit 200 as long as the function thereof can be achieved. The partial discharge detection unit 20 may obtain the partial discharge condition of the power device 11 to be measured by detecting a current value of the received high-frequency partial discharge signal, and may also obtain the partial discharge condition of the power device 11 to be measured by detecting a voltage value of the received high-frequency partial discharge signal. The partial discharge detection unit 20 may be a current sensor or a voltage sensor, and the present embodiment does not limit the kind, structure, and the like of the partial discharge detection unit 20 as long as the function thereof can be achieved.
The high-frequency partial discharge sensing circuit 10 provided by the present embodiment operates as follows:
in use, a first end of the first capacitor 100 in the high frequency partial discharge sensing circuit 10 is connected to the power device 11 to be measured, and a second end of the isolation unit 200 in the high frequency partial discharge sensing circuit 10 is connected to the partial discharge detection unit 20. When the power device 11 to be tested has a partial discharge phenomenon, the first capacitor blocks the low-frequency signal of the power device 11 to be tested, and the power frequency signal and the high-frequency partial discharge signal are transmitted to the isolation unit 200 through the first capacitor 100. The isolation unit 200 isolates the power frequency signal, so that the high frequency partial discharge signal can be transmitted to the partial discharge detection unit 20 through the second end of the isolation unit 200. By detecting the high-frequency partial discharge signal by the partial discharge detection unit 20, the partial discharge condition of the power device 11 to be measured can be acquired.
The high frequency partial discharge sensing circuit 10 provided by the present embodiment includes a first capacitor 100 and an isolation unit 200. The second end of the first capacitor 100 is connected to the first end of the isolation unit 200, and when in use, the first end of the first capacitor 100 is connected to the power device 11 to be tested, and the second end of the isolation unit 200 is connected to the partial discharge detection unit 20. The isolation unit 200 is configured to isolate the power frequency signal and the high-frequency partial discharge signal passing through the first capacitor 100, so that the partial discharge detection unit 20 detects the high-frequency partial discharge signal of the power device to be detected. The high-frequency partial discharge sensing circuit 10 that this embodiment provided passes through isolation unit 200 and keeps apart power frequency signal and high-frequency partial discharge signal, make when using partial discharge detecting element 20 to detect the high-frequency partial discharge signal of electrical equipment 11 that awaits measuring, can not receive power frequency signal's interference, thereby can improve the accuracy that detects high-frequency partial discharge signal, and then make the staff can be according to the partial discharge condition of electrical equipment 11 that awaits measuring, in time carry out corresponding processing, can prevent the huge loss that destructive partial discharge caused. In addition, the high-frequency partial discharge sensing circuit 10 provided by the present embodiment has a simple structure and is easy to implement.
In a specific embodiment, the analytical model for partial discharge detection using the pulsed current method can be represented by a capacitance model as shown in fig. 2. Wherein, the capacitor CgIndicating the internal capacitance, C, of the insulation defect of the electrical equipment to be tested when partial discharge occursbRepresenting the capacitance of the insulator, capacitance C, in the electrical equipment under test in series with the defective capacitancemIndicating the capacitance of other insulators, capacitance C, in the power equipment to be testedcA first capacitance 100 in the high frequency partial discharge sensing circuit 10 is shown and Z represents the impedance in the partial discharge detection unit 20. S represents an AC power supply, a capacitor CiRepresenting the calibration capacitance and F the calibration pulse generator.
Before the high-frequency partial discharge sensing circuit 10 is used, an alternating current power supply S and a calibration capacitor C can be usediAnd the calibration pulse generator F simulates the partial discharge phenomenon of the power equipment to be measured, and calibrates the high-frequency partial discharge sensing circuit 10, so that the high-frequency partial discharge sensing circuit is more accurate in actual measurement.
When partial discharge occurs inside the electrical equipment 11 to be tested, the capacitor CgThe electric charges at the two ends can be neutralized, and the capacitor C can be causedbAn equivalent charge jump occurs and a high-frequency pulse current to the outside of the power device under test 11 is formed. When the high-frequency pulse current is transmitted to the partial discharge detection unit 20 through the high-frequency partial discharge sensing circuit 10, the partial discharge detection unit 20 can obtain the partial discharge condition of the power device 11 to be detected by detecting the voltage at the two ends of the impedance ZThe method is described. Meanwhile, the partial discharge detection unit 20 may also directly detect the current transmitted to the partial discharge detection unit 20 to infer the partial discharge condition of the power device 11 to be tested.
Referring to fig. 3, in one embodiment, the isolation unit 200 includes a second capacitor 210 and an inductor 220, the second capacitor 210 includes a first terminal and a second terminal, and the inductor 220 includes a first terminal and a second terminal. A first terminal of the second capacitor 210 is connected to a second terminal of the first capacitor 100. In use, a second terminal of the second capacitor 210 is connected to the partial discharge detection unit 20. A first terminal of the inductor 220 is connected to a first terminal of the second capacitor 210, and a second terminal of the inductor 220 is connected to ground. The second capacitor 220 may pass high frequencies and block low frequencies, i.e. high frequency signals may pass through the second capacitor 220 and low frequency signals may be blocked by the second capacitor 220. The power frequency signal is 50Hz and belongs to a low frequency signal, and then the power frequency signal and the high frequency partial discharge signal passing through the second end of the first capacitor 100 are blocked by the second capacitor 210, so that the signal transmitted to the partial discharge detection unit 20 through the second end of the second capacitor 210 only includes the high frequency partial discharge signal. The partial discharge detection unit 20 may obtain the partial discharge condition of the power device 11 under test according to the received high-frequency partial discharge signal. The inductor 220 may pass low frequency and block high frequency, i.e., low frequency signals may pass through the inductor 220, and high frequency signals may be blocked by the inductor 220. After the power frequency signal and the high frequency partial discharge signal passing through the second end of the first capacitor 100 pass through the inductor 220, the high frequency partial discharge signal is blocked, so that the power frequency signal flows into the ground through the second end of the inductor 220. The specific values of the second capacitor 210 and the inductor 220 are not limited in this embodiment, as long as the functions thereof can be realized. In this embodiment, the signal transmitted to the partial discharge detection unit 20 may only include a high-frequency partial discharge signal through the second capacitor 210, so that the partial discharge detection unit 20 is not interfered by the power frequency signal when detecting the partial discharge of the power device 11 to be detected, thereby improving the detection accuracy. The power frequency signal flows into the ground through the inductor 220, so that the safety problem caused by the power frequency signal is avoided.
In one embodiment, the power frequency signal passing through the inductor 220 may be received for other uses, thereby reducing energy waste.
Referring to fig. 4, in one embodiment, the high frequency partial discharge sensing circuit 10 further includes a protection unit 300. The protection unit 300 is connected in parallel with the isolation unit 200 for protecting the high frequency partial discharge sensing circuit 10. When the power device 11 to be tested is interfered by the external transient overvoltage, the protection unit 300 can prevent the electronic devices in the high-frequency partial discharge sensing circuit 10 from being seriously damaged due to the external transient overvoltage interference, so that the practicability and reliability of the high-frequency partial discharge sensing circuit 10 can be improved. The external transient overvoltage interference mainly comprises: operating overvoltage due to on-off inductive load or on-off high-power load, and line fault; lightning surge due to natural phenomena such as lightning. The protection unit 300 may be a resistor capable of dividing the instantaneous overvoltage, or other electronic components, and the present embodiment does not limit the structure of the protection unit 300, as long as the function thereof can be achieved. In a specific embodiment, the protection unit 300 can also prevent the transient overvoltage from damaging the partial discharge detection unit 20.
Referring to fig. 5, in one embodiment, the protection unit 300 includes a transient diode 310, a voltage dependent resistor 320, and a gas discharge tube 330.
The transient diode 310 is a high performance protection device in the form of a diode that includes a first terminal and a second terminal. When the transient diode 310 receives a surge through the first capacitor 100, it changes the high impedance between its two ends to a low impedance, and absorbs up to several kilowatts of surge power to make the voltage clamp across the transient diode 310 be at a predetermined value, so that it is possible to prevent the surge from damaging the isolation unit 200 and the partial discharge detection unit 20. The transient diode 310 may be classified into a unipolar device and a bipolar device according to polarity, and may be classified into a general device and a dedicated device according to usage. The present embodiment does not limit the kind of the transient diode 310 as long as the function thereof can be achieved.
A voltage dependent resistor 320 is connected in parallel with the transient diode 310 for shunting. The varistor 320 is a resistor device having a nonlinear current-voltage characteristic, and includes a first terminal and a second terminal. A first terminal of the varistor 320 is connected to a first terminal of the transient diode 310 and a second terminal of the varistor 320 is connected to a second terminal of the transient diode 310. By utilizing the nonlinear characteristic of the voltage dependent resistor 320, when the power device 11 under test has an instantaneous overvoltage and an overvoltage occurs between two ends of the voltage dependent resistor 320, the voltage dependent resistor 320 can clamp the voltage at a relatively fixed voltage value and absorb the excessive current to protect the isolation unit 200 and the partial discharge detection unit 20. The material of the piezoresistor 320 can be a semiconductor, and the embodiment does not limit the material, value, and the like of the piezoresistor 320, as long as the function thereof can be achieved.
A gas discharge tube 330 is connected in parallel with the varistor 320 for discharging current to ground. The gas discharge tube 330 is hermetically sealed with ceramic, and has two metal electrodes with gaps filled with inert gas. Two metal electrodes are respectively used as the first end and the second end of the gas discharge tube 330, and are respectively connected with the first end and the second end of the pressure sensitive resistor 320. When instantaneous overvoltage exists in the power device 11 to be tested, and the voltage at the two ends of the gas discharge tube 330 reaches the voltage to make the gas in the gas discharge tube 330 break down, the gas discharge tube 330 starts to discharge, the current is discharged to the ground, and the high resistance is changed into low resistance, so that the voltage at the two ends of the gas discharge tube 300 does not exceed the breakdown voltage. The present embodiment does not impose any limitation on the structure of the gas discharge tube 330 as long as the function thereof can be achieved.
The specific working process of protecting the high-frequency partial discharge sensing circuit by using the protection unit 300 provided in the above embodiment is as follows:
when a surge such as lightning enters the protection unit 300 through the first capacitor 100, the transient diode 310 is first turned on, and an instantaneous overvoltage generated by the lightning surge can be fixed at a certain value; when the surge current is large, the voltage dependent resistor 320 is started to discharge a certain surge current, so that the voltage at the two ends of the voltage dependent resistor 320 is increased until the breakdown voltage of the gas discharge tube 330 is reached, the gas discharge tube 330 is conducted, discharge is started, and the current is discharged to the ground. In this embodiment, the varistor 320 and the gas discharge tube 330 are used in parallel, and the varistor 320 is used to respond to the wave head of the transient overvoltage, and then the residual voltage of the varistor 320 is used to conduct the gas discharge tube 330, so as to discharge the current to the ground. The protection unit 300 has no problem of generating follow current, can solve the problem of discharge time delay of the gas discharge tube 300, and has higher practicability and reliability.
Referring to fig. 6, an embodiment of the present application provides a high-frequency partial discharge sensing device 30 including a housing 31, a first nut 32, a second nut 33, and a circuit board 34. The housing 31 is provided with an accommodation chamber 35. The volume of the accommodating chamber 35 may be set according to the size and number of the devices disposed in the accommodating chamber 35, and the embodiment is not limited thereto. The structure of the shell 31 may be a rectangular parallelepiped, or a cylinder or other irregular three-dimensional structure. The material of the housing 31 may be hard plastic or stainless steel with an insulating layer. The present embodiment does not set any limit to the shape, material, size, and the like of the housing 31 as long as the function thereof can be achieved. In one particular embodiment, the housing 31 takes the shape and specifications of a standard post insulator.
In one embodiment, the housing 31 is made by epoxy casting. The epoxy resin is a generic name of a polymer having two or more epoxy groups in a molecule. The epoxy resin has good electrical insulation performance and flexibility of the using process, and can be prepared into paint, casting material and the like. The case 31 formed by casting epoxy resin has better insulation, so that the safety of users can be improved.
The first nut 32 is disposed at a first end of the housing 31 and is used for connecting with the power device 11 to be tested. The first nut 32 is embedded in the first end of the housing 31, and when in use, the high-frequency partial discharge sensing device 30 is connected to the power device 11 to be tested by using a screw corresponding to the first nut 32. A plurality of first nuts 32 with different sizes may be embedded in the first end of the housing 31, so that the high-frequency partial discharge sensing device 30 may be applied to the power device 11 to be tested corresponding to the plurality of first nuts 32 with different sizes. In other words, if different nuts are provided for different electric devices 11 to be tested, the high-frequency partial discharge sensing apparatus 30 using the first nuts 32 having different sizes can be applied to a plurality of electric devices 11 to be tested, which can improve the practicability of the high-frequency partial discharge sensing apparatus 30.
A second nut 33 is provided at a second end of the housing 31 for grounding the high frequency partial discharge sensing device 30. The second nut 33 is embedded in the second end of the shell 31, and when the high-frequency partial discharge sensing device 30 is used, the high-frequency partial discharge sensing device is connected with grounding equipment by using a screw corresponding to the second nut 33, so that grounding of the high-frequency partial discharge sensing device 30 is realized, and the safety of using the high-frequency partial discharge sensing device 30 is improved. The grounding device can be a grounding device in the power device to be tested, and can also be a grounding device reset by a worker. The second nut 33 and the first nut 32 may be the same or different, and the detailed description of the second nut 33 may refer to the description of the first nut 32, which is not repeated herein.
The circuit board 34 is disposed in the accommodating cavity 35, and the circuit board 34 may also be referred to as a printed circuit board, which is a provider of connection of electronic components. The isolation unit 200 in the high-frequency partial discharge sensing circuit 10 is soldered to the circuit board 34, and the electrical connection of each electronic component in the isolation unit 200 is realized. The first capacitor 100 in the high-frequency partial discharge sensing circuit 10 is disposed in the accommodating cavity 35, a first end of the first capacitor 100 is connected to the power device 11 to be tested through the first nut 32, and a second end of the first capacitor 100 is electrically connected to the isolating unit 300 welded to the circuit board 34. For the specific description of the high-frequency partial discharge sensing circuit 10, reference is made to the description in the above embodiments, and the description is omitted here.
With continued reference to fig. 6, in one embodiment, the high frequency partial discharge sensing device 30 further includes an rf terminal 36. The rf terminal 36 is connected to the high frequency partial discharge sensing circuit 10 for connecting the high frequency partial discharge sensing device 30 to the partial discharge detecting unit 20. In the present embodiment, the use of the rf terminal 36 can facilitate the connection of the partial discharge detection unit 20 of the high frequency partial discharge sensor 30. The rf terminal 36 may be a B-type rf terminal or an N-type rf terminal. The present embodiment does not set any limit to the kind of the rf terminal 26 as long as the function thereof can be achieved.
In one embodiment, the rf terminal 36 is an SMA rf terminal. The SMA radio frequency terminal is a microwave high-frequency connector, which can improve the good standing-wave ratio, has small reflection to the transmitted signal, and can effectively transmit the high-frequency partial discharge signal, thereby improving the accuracy of the detection of the partial discharge detection unit 20.
Referring to fig. 7, an embodiment of the present application further provides a high-frequency partial discharge detection system 40, which includes the high-frequency partial discharge sensing device 30 and the partial discharge detection unit 40 provided in the above embodiments. The partial discharge detection unit 40 is connected to the high-frequency partial discharge sensing circuit 10, and is configured to detect a high-frequency partial discharge signal of the power device under test. For specific description of the high-frequency partial discharge sensing device 30 and the partial discharge detection unit 40, reference may be made to the description in the above embodiments, and details are not repeated here. Since the high-frequency partial discharge detection system 40 includes the high-frequency partial discharge sensing device 30, all the structures and advantages of the high-frequency partial discharge sensing device 30 are provided, and will not be described in detail herein.
In one embodiment, the partial discharge detection unit 20 and the high frequency partial discharge sensing device 30 are connected by a radio frequency cable. That is, the partial discharge detection unit 20 is connected to the second terminal of the second capacitor 210 in the high frequency partial discharge sensing circuit 20 in the high frequency partial discharge sensing device 30. The radio frequency cable is a cable for transmitting electromagnetic energy in a radio frequency range, can transmit a wider frequency band, and has higher defense degree on external interference. The radio frequency cable is connected with the partial discharge detection unit 20, so that the influence of environmental electromagnetic noise on the high-frequency partial discharge signal transmitted to the partial discharge detection unit 20 through the second capacitor can be reduced, and the accuracy of detecting the partial discharge signal of the power equipment to be detected can be improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within 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 invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A high frequency partial discharge sensing circuit, comprising:
the first end of the first capacitor is used for being connected with the power equipment to be tested;
the isolation unit, the first end of isolation unit with the second end of first electric capacity is connected, the second end of isolation unit is used for being connected with the partial discharge detecting element, the isolation unit is used for keeping apart the power frequency signal and the high frequency partial discharge signal that pass through first electric capacity, so that the partial discharge detecting element detects the electrical equipment that awaits measuring the high frequency partial discharge signal.
2. The circuit of claim 1, wherein the isolation unit comprises:
a first end of the second capacitor is connected with a second end of the first capacitor, and a second end of the second capacitor is used for being connected with the partial discharge detection unit;
and the first end of the inductor is connected with the first end of the second capacitor, and the second end of the inductor is used for grounding.
3. The circuit of claim 1, further comprising:
and the protection unit is connected with the isolation unit in parallel and is used for protecting the high-frequency partial discharge sensing circuit.
4. The circuit of claim 3, wherein the protection unit comprises:
a transient diode, a first end of the transient diode being connected to the first end of the isolation unit, and a second end of the transient diode being used for grounding;
the piezoresistor is connected with the transient diode in parallel and used for shunting;
and the gas discharge tube is connected with the piezoresistor in parallel and used for discharging current to the ground.
5. A high frequency partial discharge sensing device, comprising:
a housing provided with an accommodating chamber;
the first nut is arranged at the first end of the shell and used for being connected with the power equipment to be tested;
the second nut is arranged at the second end of the shell and used for grounding the high-frequency partial discharge sensing device;
the circuit board is arranged in the accommodating cavity;
the high frequency partial discharge sensing circuit according to any one of claims 1 to 4;
the first capacitor of the high-frequency partial discharge sensing circuit is arranged in the accommodating cavity and between the first nut and the second nut, and the isolation unit is welded on the circuit board.
6. The apparatus of claim 5, further comprising:
and the radio frequency terminal is connected with the high-frequency partial discharge sensing circuit and is used for connecting the high-frequency partial discharge sensing device with the partial discharge detection unit.
7. The apparatus of claim 6, wherein the radio frequency terminal is an SMA radio frequency terminal.
8. The device of claim 5, wherein the housing is formed by epoxy casting.
9. A high frequency partial discharge detection system, comprising:
a high frequency partial discharge sensing apparatus according to any one of claims 5 to 8;
and the partial discharge detection unit is connected with the high-frequency partial discharge sensing circuit and is used for detecting a high-frequency partial discharge signal of the power equipment to be detected.
10. The system of claim 9, wherein the partial discharge detection unit and the high frequency partial discharge sensing device are connected by a radio frequency cable.
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| CN202011267552.0A CN112379232A (en) | 2020-11-13 | 2020-11-13 | High-frequency partial discharge sensing circuit, device and high-frequency partial discharge detection system |
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