Three-in-one sensor of switch cabinet

Abstract

The utility model relates to the technical field of signal acquisition, in particular to a three-in-one sensor for a switch cabinet, which comprises an ultrasonic partial discharge signal analog front end for assisting in direct acquisition of air ultrasonic partial discharge signals, a transient earth voltage partial discharge signal analog front end for converting high-frequency signals into low-frequency signals, a temperature acquisition module and a master control module, the main control module is provided with a switching module and an acquisition module. According to the utility model, a series of work such as direct acquisition of air ultrasonic partial discharge signals, conversion of transient ground voltage partial discharge signals from high-frequency signals to low-frequency signals, acquisition of the transient ground voltage partial discharge signals after detection, temperature information acquisition and the like can be realized, the number of components and the dependence on high-performance hardware are reduced, wiring is convenient, space occupation is reduced, and the cost is reduced. And meanwhile, the ultrasonic partial discharge signal simulation front end, the transient earth voltage partial discharge signal simulation front end and the temperature acquisition module are controlled to work through the switching module, so that coordination work of all parts is facilitated, dormancy of all parts can be controlled, and energy consumption is reduced.

Description

Technical Field

[0001] This utility model relates to the field of signal acquisition technology, specifically to a three-in-one sensor for switch cabinets. Background Technology

[0002] Switchgear is a crucial electrical device in power systems used for distributing, controlling, and protecting electrical energy. It consists of various types of switching devices, protection devices, measuring instruments, and other auxiliary equipment, used to connect, disconnect, regulate, and protect power lines. To collect information from switchgear, multiple sensors are typically deployed to acquire various signals. Currently, the signals that need to be collected are generally air ultrasonic partial discharge signals, transient ground voltage partial discharge signals, and temperature information, thereby improving the monitoring capabilities of the switchgear. However, in practice, connecting so many sensors not only occupies a large amount of space but also increases wiring complexity. Furthermore, since the frequency distribution of transient ground voltage ranges from 3 to 100 MHz, while the sampling rate of a typical MCU's built-in ADC is generally 1 to 2 MHz, it is impossible to directly acquire the transient ground voltage partial discharge signal. An external high-speed ADC and high-speed processing module are required to acquire the transient ground voltage partial discharge signal, leading to increased costs. Utility Model Content

[0003] The technical problem to be solved by this utility model is that the existing signal acquisition method of switch cabinet requires a large number of sensors, which occupies a lot of space and increases the difficulty of wiring.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a three-in-one sensor for switchgear, comprising an ultrasonic partial discharge signal simulation front-end for assisting in the direct acquisition of air ultrasonic partial discharge signals, a transient ground voltage partial discharge signal simulation front-end for converting high-frequency signals into low-frequency signals, a temperature acquisition module, and a main control module. The main control module is provided with a switching module and an acquisition module. The main control module is connected to the control terminals of the ultrasonic partial discharge signal simulation front-end, the transient ground voltage partial discharge signal simulation front-end, and the temperature acquisition module through the switching module, and controls the operation of the ultrasonic partial discharge signal simulation front-end, the transient ground voltage partial discharge signal simulation front-end, and the temperature acquisition module. The main control module is connected to the signal output terminals of the ultrasonic partial discharge signal simulation front-end, the transient ground voltage partial discharge signal simulation front-end, and the temperature acquisition module through the acquisition module.

[0005] When this utility model is in operation, it can directly sample air ultrasonic partial discharge signals, convert transient ground voltage partial discharge signals from high-frequency signals to low-frequency signals, collect transient ground voltage partial discharge signals after detection, and collect temperature information, etc. It has a high degree of automation, reduces the number of components and dependence on high-performance hardware, facilitates wiring and reduces space occupation. At the same time, the switching module controls the operation of the ultrasonic partial discharge signal simulation front end, the transient ground voltage partial discharge signal simulation front end and the temperature acquisition module, which facilitates the coordinated operation of each part and can also control the sleep of each part to reduce energy consumption. It has a wide range of applications and good versatility.

[0006] Preferably, the transient ground voltage partial discharge signal analog front end includes an interface P1 for connecting the corresponding transient ground voltage capacitively coupled antenna, operational amplifiers U1 and U2, a driver chip U3, a multiplexer chip U4, diodes D1 and D2, resistors R1, R2, R3, R4, R5, R6, R7, R8, R10, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24, and capacitors C13, C15, C17, C18, C19, and C2. 0. Capacitors C25 and C106 are connected to the signal terminal of interface P1, which is connected to the first terminal of capacitor C14 and grounded through capacitor C16. The ground terminal of interface P1 is grounded. The second terminal of capacitor C14 is connected to the first terminal of diode D2 through the control module and grounded through resistor R9. The first terminal of diode D2 is connected to the first terminal of resistor R1 and the first terminal of capacitor C13. The second terminal of resistor R1 is connected to the second terminal of capacitor C13 and grounded through resistor R8 and capacitor C17 respectively. The second terminal of resistor R1 is connected to the non-inverting input terminal of operational amplifier U1 through resistor R2 and capacitor C15 arranged in parallel. The inverting input terminal of operational amplifier U1 is connected to the operational amplifier through resistor R12. The output terminal of operational amplifier U1 is connected to the ground via resistor R7 and connected to the non-inverting input terminal of operational amplifier U2 via resistor R3. The inverting input terminal of operational amplifier U2 is grounded via resistor R22 and connected to the output terminal of operational amplifier U2 via a parallel resistor R13 and capacitor C20. The inverting input terminal of operational amplifier U2 is connected to the COM port of multiplexer chip U4. The CH0 port of multiplexer chip U4 is connected to the output terminal of operational amplifier U2. The CH1 port of multiplexer chip U4 is connected to the output terminal of operational amplifier U2 via resistor R21. The CH2 port of multiplexer chip U4 is connected to the operational amplifier via resistors R20 and R21. The output terminal of amplifier U2 is connected to the CH3 port of multiplexer chip U4, which is connected to the output terminal of operational amplifier U2 through resistors R19, R20, and R21, and grounded through resistor R18. The output terminal of operational amplifier U2 is grounded through resistor R10 and connected to the +IN port of driver chip U3 through resistor R4. The +IN port of driver chip U3 is connected to the -OUT port of driver chip U3 through resistor R5. The -OUT port of driver chip U3 is connected to the pulse trigger port of the main control module through resistor R6 and connected to the first end of resistor R11. The second end of resistor R11 is connected to the differential negative input terminal of the acquisition module and grounded through capacitor C18 and diode D3 respectively.The +OUT port of the driver chip U3 is connected to the -IN port of the driver chip U3 through resistor R17 and to the first end of resistor R16. The second end of resistor R16 is connected to the differential positive input terminal of the acquisition module and grounded through capacitor C19 and diode D4. The -IN port of the driver chip U3 is grounded through resistors R15 and R14. The VOCM port of the driver chip U3 is connected to the first end of resistor R24 ​​and grounded through capacitor C25 and resistor R23. The second end of resistor R24 ​​is connected to the common-mode voltage terminal of the acquisition module and grounded through capacitor C106.

[0007] When this utility model is in operation, the transient ground voltage partial discharge signal analog front end can realize a series of operations such as high-precision signal amplification, gain control and filtering. It is suitable for high-precision signal processing of transient ground voltage partial discharge signals, and can detect high-frequency signals. This makes it convenient for the main control module to collect the detected data, thereby avoiding dependence on high-performance hardware, reducing usage costs and improving economic efficiency while ensuring acquisition accuracy.

[0008] Preferably, the transient ground voltage partial discharge signal analog front end further includes several first filtering modules. The positive power supply terminal of the operational amplifier U1, the negative power supply terminal of the operational amplifier U1, the positive power supply terminal of the operational amplifier U2, the negative power supply terminal of the operational amplifier U2, the +V port of the driver chip U3, and the V- port of the driver chip U3 are all connected to the corresponding power supply through their respective first filtering modules.

[0009] Preferably, the first filtering module includes an inductor L2, a capacitor C1, a capacitor C2, and a capacitor C3. The first end of the inductor L2 is connected to the positive power supply terminal of the operational amplifier U1, the negative power supply terminal of the operational amplifier U1, the positive power supply terminal of the operational amplifier U2, the negative power supply terminal of the operational amplifier U2, the +V port of the driver chip U3, or the V- port of the driver chip U3, and is grounded through the capacitors C1 and C2 respectively. The second end of the inductor L2 is connected to the power supply and is grounded through the capacitor C3.

[0010] Preferably, the ultrasonic partial discharge signal analog front end includes an interface U8 for connecting to an air ultrasonic probe, an amplification chip U6, a switching chip U11, operational amplifiers U91 and U92, a diode D6, resistors R39, R40, R41, R43, R46, R47, R48, R49, R50, R51, R55, R56, R57, R58, R95, and R96, capacitors C46, ​​C47, C50, C51, C54, C56, and C113. The VIN+ port of amplifier chip U6 is connected to the first pin of interface U8 via resistor R43 and grounded via resistor R56. The VIN- port of amplifier chip U6 is connected to the second pin of interface U8 via resistor R49 and grounded via resistor R55. The RG1 port of amplifier chip U6 is connected to the COM port of switching chip U11 and to the RG2 port of amplifier chip U6 via resistor R96. The NC port of switching chip U11 is connected to the RG2 port of amplifier chip U6 via resistor R39. The NO port of switching chip U11 is connected to the RG2 port of amplifier chip U6 via resistor R95. The VOUT port of the amplifier chip U6 is connected to the first end of resistor R46. The second end of resistor R46 is connected to the inverting input of operational amplifier U91 through capacitor C50 and to the output of operational amplifier U91 through capacitor C46. The second end of resistor R46 is grounded through resistor R51. The inverting input of operational amplifier U91 is connected to the output of operational amplifier U91 through resistor R40. The output of operational amplifier U91 is connected to the first end of resistor R47. The second end of resistor R47 is connected to the inverting input of operational amplifier U92 through capacitor C51 and to the first end of resistor R47 through capacitor C47. The second end of resistor R47 is grounded through resistor R50, connected to the output of operational amplifier U92. The negative power supply terminal of operational amplifier U91 is connected to the non-inverting input terminal of operational amplifier U92 through resistor R58. The inverting input terminal of operational amplifier U92 is connected to the output terminal of operational amplifier U92 through resistor R41. The non-inverting input terminal of operational amplifier U92 is grounded through capacitor C113 and resistor R57. The output terminal of operational amplifier U92 is connected to the first end of resistor R48. The second segment of resistor R48 is connected to the acquisition module and grounded through capacitor C54 and diode D6.

[0011] When this utility model is in operation, the ultrasonic partial discharge signal analog front end can realize a series of functions such as buffering and preliminary amplification of the input signal, filtering, high-precision amplification of the signal, and output of the ultrasonic partial discharge signal. It can ensure high gain and low noise, so that the signal can maintain good linearity and stability. At the same time, it is suitable for large dynamic range and high resolution acquisition work, with strong stability and reliability.

[0012] Preferably, the ultrasonic partial discharge signal simulation front end further includes several second filter circuits. The V- port of the amplifier chip U6, the V+ port of the amplifier chip U6, the positive power supply terminal of the operational amplifier U91, and the negative power supply terminal of the operational amplifier U92 are all connected to the corresponding power supply through their respective second filter modules.

[0013] Preferably, the second filtering module includes an inductor L8, a capacitor C43, a capacitor C44, and a capacitor C45. The first end of the inductor L8 is connected to the V- port of the amplifier chip U6, the V+ port of the amplifier chip U6, the positive power supply terminal of the operational amplifier U91, or the negative power supply terminal of the operational amplifier U92, and is grounded through the capacitors C44 and C45 respectively. The second end of the inductor L8 is connected to the power supply and is grounded through the capacitor C43.

[0014] The beneficial technical effects of this utility model include:

[0015] 1. This utility model can realize a series of tasks such as direct sampling of air ultrasonic partial discharge signals, conversion of transient ground voltage partial discharge signals from high-frequency signals to low-frequency signals, acquisition of transient ground voltage partial discharge signals after detection, and acquisition of temperature information. It has a high degree of automation, reduces the number of components and dependence on high-performance hardware, facilitates wiring and reduces space occupation. At the same time, the switching module controls the operation of the ultrasonic partial discharge signal simulation front end, the transient ground voltage partial discharge signal simulation front end and the temperature acquisition module, which facilitates the coordinated operation of each part and can also control the sleep of each part to reduce energy consumption. It has a wide range of applications and good versatility.

[0016] 2. This utility model adopts a transient ground voltage partial discharge signal analog front end, which can realize a series of operations such as high-precision signal amplification, gain control and filtering. It is suitable for high-precision signal processing of transient ground voltage partial discharge signals, and can detect high-frequency signals. This makes it convenient for the main control module to collect the detected data, thereby avoiding dependence on high-performance hardware, reducing the cost of use, improving economic efficiency and ensuring the accuracy of acquisition.

[0017] 3. This utility model uses an ultrasonic partial discharge signal analog front end, which can realize a series of functions such as input signal buffering and preliminary amplification, filtering, high-precision signal amplification, and ultrasonic partial discharge signal output. It can ensure high gain and low noise, so that the signal can maintain good linearity and stability. It is also suitable for large dynamic range and high resolution acquisition work, with strong stability and reliability.

[0018] Other features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of a three-in-one sensor for switchgear.

[0021] Figure 2 Circuit structure for analog front-end of transient ground voltage partial discharge signal Figure 1 ;

[0022] Figure 3 Circuit structure for analog front-end of transient ground voltage partial discharge signal Figure 2 ;

[0023] Figure 4 Circuit structure for analog front-end of transient ground voltage partial discharge signal Figure 3 ;

[0024] Figure 5 Circuit structure for the analog front end of ultrasonic partial discharge signals Figure 1 ;

[0025] Figure 6 Circuit structure for the analog front end of ultrasonic partial discharge signals Figure 1 . Detailed Implementation

[0026] The technical solutions of the present utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present utility model.

[0027] In the following description, terms such as “inner,” “outer,” “upper,” “lower,” “left,” and “right” are used only to facilitate the description of the embodiments and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Please see Figure 1 This embodiment discloses a three-in-one sensor for switchgear, including an ultrasonic partial discharge signal simulation front-end 1 for assisting in the direct acquisition of air ultrasonic partial discharge signals, a transient ground voltage partial discharge signal simulation front-end 2 for converting high-frequency signals into low-frequency signals, a temperature acquisition module 423, and a main control module 4. The following is a detailed description in conjunction with the accompanying drawings.

[0029] Please see Figure 1 In this embodiment, the main control module 4 is provided with a switching module 41 and an acquisition module 42. The main control module 4 is connected to the control terminal of the ultrasonic partial discharge signal simulation front-end 1, the control terminal of the transient ground voltage partial discharge signal simulation front-end 2, and the control terminal of the temperature acquisition module 423 through the switching module 41, and controls the ultrasonic partial discharge signal simulation front-end 1, the transient ground voltage partial discharge signal simulation front-end 2, and the temperature acquisition module 423 to work. The main control module 4 is connected to the signal output terminal of the ultrasonic partial discharge signal simulation front-end 1, the signal output terminal of the transient ground voltage partial discharge signal simulation front-end 2, and the signal output terminal of the temperature acquisition module 423 through the acquisition module 42.

[0030] In operation, this embodiment can directly sample ultrasonic partial discharge signals from the air, convert transient ground voltage partial discharge signals from high-frequency signals to low-frequency signals, collect transient ground voltage partial discharge signals after detection, and collect temperature information, among other tasks. It has a high degree of automation, reduces the number of components and dependence on high-performance hardware, facilitates wiring, and reduces space occupation. At the same time, the switching module 41 controls the operation of the ultrasonic partial discharge signal simulation front end 1, the transient ground voltage partial discharge signal simulation front end 2, and the temperature acquisition module 423, which facilitates the coordinated operation of each part and can also control the sleep mode of each part to reduce energy consumption. It has a wide range of applications and good versatility.

[0031] Please see Figure 2In specific implementation, the transient ground voltage partial discharge signal analog front-end 2 includes an interface P1 for connecting the corresponding transient ground voltage capacitively coupled antenna, operational amplifiers U1 and U2, a driver chip U3, a multiplexer chip U4, diodes D1 and D2, resistors R1, R2, R3, R4, R5, R6, R7, R8, R10, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24, and capacitors C13, C15, C17, and C18. Capacitors C19, C20, C25, and C106 are connected to the signal terminal of interface P1, which is connected to the first terminal of capacitor C14 and grounded through capacitor C16. The ground terminal of interface P1 is grounded. The second terminal of capacitor C14 is connected to the first terminal of diode D2 through the control module and grounded through resistor R9. The first terminal of diode D2 is connected to the first terminal of resistor R1 and the first terminal of capacitor C13. The second terminal of resistor R1 is connected to the second terminal of capacitor C13 and grounded through resistor R8 and capacitor C17 respectively. The second terminal of resistor R1 is connected to the non-inverting input terminal of operational amplifier U1 through resistor R2 and capacitor C15 arranged in parallel. The inverting input terminal of operational amplifier U1 is connected to the non-inverting input terminal of operational amplifier U1 through resistor R12. The output of operational amplifier U1 is connected to the ground via resistor R7 and connected to the non-inverting input of operational amplifier U2 via resistor R3. The inverting input of operational amplifier U2 is grounded via resistor R22 and connected to its output via a parallel resistor R13 and capacitor C20. The inverting input of operational amplifier U2 is connected to the COM port of multiplexer chip U4. The CH0 port of multiplexer chip U4 is connected to the output of operational amplifier U2. The CH1 port of multiplexer chip U4 is connected to the output of operational amplifier U2 via resistor R21. The CH2 port of multiplexer chip U4 is connected to the operational amplifier via resistors R20 and R21. The output of the multiplexer U2 is connected to the CH3 port of the multiplexer chip U4, which is connected to the output of the operational amplifier U2 through resistors R19, R20, and R21, and grounded through resistor R18. The output of the operational amplifier U2 is grounded through resistor R10 and connected to the +IN port of the driver chip U3 through resistor R4. The +IN port of the driver chip U3 is connected to the -OUT port of the driver chip U3 through resistor R5. The -OUT port of the driver chip U3 is connected to the pulse trigger port of the main control module 4 through resistor R6 and connected to the first end of resistor R11. The second end of resistor R11 is connected to the differential negative input of the acquisition module 42 and grounded through capacitor C18 and diode D3 respectively.The +OUT port of driver chip U3 is connected to the -IN port of driver chip U3 through resistor R17 and to the first end of resistor R16. The second end of resistor R16 is connected to the differential positive input terminal of acquisition module 42 and grounded through capacitor C19 and diode D4 respectively. The -IN port of driver chip U3 is grounded through resistors R15 and R14. The VOCM port of driver chip U3 is connected to the first end of resistor R24 ​​and grounded through capacitor C25 and resistor R23 respectively. The second end of resistor R24 ​​is connected to the common-mode voltage terminal of acquisition module 42 and grounded through capacitor C106.

[0032] In this embodiment, the transient ground voltage partial discharge signal analog front-end 2 can perform a series of operations such as high-precision signal amplification, gain control and filtering. It is suitable for high-precision signal processing of transient ground voltage partial discharge signals and can detect high-frequency signals. This makes it convenient for the main control module 4 to collect the detected data, thereby avoiding dependence on high-performance hardware. While reducing the cost of use and improving economic efficiency, it also ensures the accuracy of data acquisition.

[0033] Preferably, the transient ground voltage partial discharge signal analog front end 2 further includes several first filtering modules. The positive power supply terminal of operational amplifier U1, the negative power supply terminal of operational amplifier U1, the positive power supply terminal of operational amplifier U2, the negative power supply terminal of operational amplifier U2, the +V port of driver chip U3, and the V- port of driver chip U3 are all connected to the corresponding power supply through their respective first filtering modules.

[0034] In specific implementation, the first filtering module includes inductor L2, capacitor C1, capacitor C2 and capacitor C3. The first end of inductor L2 is connected to the positive power supply terminal of operational amplifier U1, the negative power supply terminal of operational amplifier U1, the positive power supply terminal of operational amplifier U2, the negative power supply terminal of operational amplifier U2, the +V port of driver chip U3 or the V- port of driver chip U3, and is grounded through capacitor C1 and capacitor C2 respectively. The second end of inductor L2 is connected to the power supply and grounded through capacitor C3.

[0035] Please see Figure 3In this embodiment, the ultrasonic partial discharge signal analog front-end 1 includes an interface U8 for connecting to an air ultrasonic probe, an amplification chip U6, a switching chip U11, an operational amplifier U91, an operational amplifier U92, a diode D6, resistors R39, R40, R41, R43, R46, R47, R48, R49, R50, R51, R55, R56, R57, R58, R95, R96, and capacitors C46, ​​C47, C50, C51, C54, and C56. The amplifier chip U6's VIN+ port is connected to the first pin of interface U8 via resistor R43 and grounded via resistor R56. The amplifier chip U6's VIN- port is connected to the second pin of interface U8 via resistor R49 and grounded via resistor R55. The amplifier chip U6's RG1 port is connected to the COM port of switching chip U11 and to the RG2 port of amplifier chip U6 via resistor R96. The switching chip U11's NC port is connected to the RG2 port of amplifier chip U6 via resistor R39. The switching chip U11's NO port is connected to the R11 port of amplifier chip U6 via resistor R95. The G2 port is connected. The VOUT port of amplifier chip U6 is connected to the first end of resistor R46. The second end of resistor R46 is connected to the inverting input of operational amplifier U91 through capacitor C50 and to the output of operational amplifier U91 through capacitor C46. The second end of resistor R46 is grounded through resistor R51. The inverting input of operational amplifier U91 is connected to the output of operational amplifier U91 through resistor R40. The output of operational amplifier U91 is connected to the first end of resistor R47. The second end of resistor R47 is connected to the inverting input of operational amplifier U92 through capacitor C51 and to the first end of resistor R47. C47 is connected to the output of operational amplifier U92. The second end of resistor R47 is grounded through resistor R50. The negative power supply terminal of operational amplifier U91 is connected to the non-inverting input terminal of operational amplifier U92 through resistor R58. The inverting input terminal of operational amplifier U92 is connected to the output terminal of operational amplifier U92 through resistor R41. The non-inverting input terminal of operational amplifier U92 is grounded through capacitor C113 and resistor R57. The output terminal of operational amplifier U92 is connected to the first end of resistor R48. The second end of resistor R48 is connected to acquisition module 42 and grounded through capacitor C54 and diode D6.

[0036] In this embodiment, the ultrasonic partial discharge signal analog front-end 1 can perform a series of operations such as buffering and preliminary amplification of the input signal, filtering, high-precision amplification of the signal, and output of the ultrasonic partial discharge signal. It can ensure high gain and low noise, so that the signal can maintain good linearity and stability. It is also suitable for large dynamic range and high resolution acquisition work, with strong stability and reliability.

[0037] Preferably, the ultrasonic partial discharge signal analog front end 1 further includes several second filter circuits. The V- port of the amplifier chip U6, the V+ port of the amplifier chip U6, the positive power supply terminal of the operational amplifier U91, and the negative power supply terminal of the operational amplifier U92 are all connected to the corresponding power supply through their respective second filter modules.

[0038] In specific implementation, the second filtering module includes inductor L8, capacitor C43, capacitor C44 and capacitor C45. The first end of inductor L8 is connected to the V- port of amplifier chip U6, the V+ port of amplifier chip U6, the positive power supply terminal of operational amplifier U91 or the negative power supply terminal of operational amplifier U92, and is grounded through capacitor C44 and capacitor C45 respectively. The second end of inductor L8 is connected to the power supply and grounded through capacitor C43.

[0039] During operation, the switchgear three-in-one sensor is activated. According to the configured interval, the ultrasonic partial discharge signal simulation front-end 1 is activated. The acquisition module 42 built into the main control module 4 directly acquires the ultrasonic partial discharge signal. After the acquisition is completed, the temperature acquisition module 423 is activated according to the configured interval to acquire temperature information. After the acquisition is completed, the transient ground voltage partial discharge signal simulation front-end 2 is activated according to the configured interval. The acquisition module 42 acquires the low-frequency signal after detection. Finally, the main control module 4 packages the three data items together and reports them to the background. Then, the switchgear three-in-one sensor enters sleep mode until the next wake-up, which can effectively reduce energy consumption and improve standby time.

[0040] The beneficial technical effects of this embodiment include: it can realize a series of tasks such as direct sampling of air ultrasonic partial discharge signals, conversion of transient ground voltage partial discharge signals from high-frequency signals to low-frequency signals, acquisition of transient ground voltage partial discharge signals after detection, and acquisition of temperature information. It has a high degree of automation, reduces the number of components and dependence on high-performance hardware, facilitates wiring and reduces space occupation. At the same time, the switching module controls the operation of the ultrasonic partial discharge signal simulation front end, the transient ground voltage partial discharge signal simulation front end and the temperature acquisition module, which facilitates the coordinated operation of each part and can also control the sleep of each part to reduce energy consumption. It has a wide range of applications and good versatility.

[0041] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A switchgear three-in-one sensor, characterized by: The utility model relates to an air ultrasonic partial discharge signal analog front end (1) for assisting air ultrasonic partial discharge signal direct acquisition, a transient voltage partial discharge signal analog front end (2) for converting high frequency signal into low frequency signal, a temperature acquisition module (42) (3) and a master control module (4), the master control module (4) is equipped with switching module (41) and acquisition module (42), the master control module (4) is connected with the control end of air ultrasonic partial discharge signal analog front end (1), the control end of transient voltage partial discharge signal analog front end (2) and the control end of temperature acquisition module (42) (3) respectively through switching module (41) and controls air ultrasonic partial discharge signal analog front end (1), transient voltage partial discharge signal analog front end (2) and temperature acquisition module (42) (3) work, the master control module (4) is connected with the signal output end of air ultrasonic partial discharge signal analog front end (1), the signal output end of transient voltage partial discharge signal analog front end (2) and the signal output end of temperature acquisition module (42) (3) respectively through acquisition module (42).

2. A switchgear three-in-one sensor according to claim 1, characterized in that: The transient ground voltage partial discharge signal analog front end (2) includes interface P1 for connecting corresponding transient ground voltage capacitive coupling antenna, operational amplifier U1, operational amplifier U2, drive chip U3, multiplexing chip U4, diode D1, diode D2, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, resistor R10, resistor R12, resistor R13, resistor R14, resistor R15, resistor R16, resistor R17, resistor R18, resistor R19, resistor R20, resistor R21, resistor R22, resistor R23, resistor R24, capacitor C13, capacitor C15, capacitor C17, capacitor C18, capacitor C19, capacitor C20, capacitor C25 and capacitor C106, the signal end of the interface P1 is connected with the first end of capacitor C14 and grounded through capacitor C16, the ground end of the interface P1 is grounded, the second end of the capacitor C14 is connected with the first end of diode D2 through a control module and grounded through resistor R9, the first end of the diode D2 is connected with the first end of resistor R1 and the first end of capacitor C13, the second end of the resistor R1 is connected with the second end of capacitor C13 and grounded through resistor R8 and capacitor C17 respectively, the second end of the resistor R1 is connected with the non-inverting input end of operational amplifier U1 through resistor R2 and capacitor C15 arranged in parallel, the inverting input end of the operational amplifier U1 is connected with the output end of operational amplifier U1 through resistor R12, the output end of the operational amplifier U1 is grounded through resistor R7 and connected with the non-inverting input end of operational amplifier U2 through resistor R3, the inverting input end of the operational amplifier U2 is grounded through resistor R22 and connected with the output end of operational amplifier U2 through resistor R13 and capacitor C20 arranged in parallel, the inverting input end of the operational amplifier U2 is connected with the COM port of multiplexing chip U4, the CH0 port of the multiplexing chip U4 is connected with the output end of operational amplifier U2, the CH1 port of the multiplexing chip U4 is connected with the output end of operational amplifier U2 through resistor R21, the CH2 port of the multiplexing chip U4 is connected with the output end of operational amplifier U2 through resistor R20 and resistor R21, the CH3 port of the multiplexing chip U4 is connected with the output end of operational amplifier U2 through resistor R19, resistor R20 and resistor R21 and grounded through resistor R18, the output end of the operational amplifier U2 is grounded through resistor R10 and connected with the +IN port of drive chip U3 through resistor R4, the +IN port of the drive chip U3 is connected with the -OUT port of drive chip U3 through resistor R5, the -OUT port of the drive chip U3 is connected with the pulse trigger port of the main control module (4) through resistor R6 and connected with the first end of resistor R11, the second end of the resistor R11 is connected with the differential negative input end of the acquisition module (42) and grounded through capacitor C18 and diode D3 respectively.The +OUT port of the drive chip U3 is connected with the -IN port of the drive chip U3 through the resistance R17 and is connected with the first end of the resistance R16, the second end of the resistance R16 is connected with the differential positive input end of the acquisition module (42) and is grounded through the capacitor C19 and the diode D4 respectively, the -IN port of the drive chip U3 is grounded through the resistance R15 and the resistance R14, the VOCM port of the drive chip U3 is connected with the first end of the resistance R24 and is grounded through the capacitor C25 and the resistance R23 respectively, the second end of the resistance R24 is connected with the common-mode voltage end of the acquisition module (42) and is grounded through the capacitor C106.

3. A switchgear three-in-one sensor according to claim 2, characterized in that: The transient voltage partial discharge signal analog front end (2) further includes a plurality of first filter modules, the positive power supply end of the operational amplifier U1, the negative power supply end of the operational amplifier U1, the positive power supply end of the operational amplifier U2, the negative power supply end of the operational amplifier U2, the +V port of the driving chip U3 and the V- port of the driving chip U3 are respectively connected with corresponding power supply through respective first filter modules.

4. The switchgear three-in-one sensor of claim 3, wherein: The first filter module includes an inductor L2, a capacitor C1, a capacitor C2 and a capacitor C3, the first end of the inductor L2 is connected with the positive power supply end of the operational amplifier U1, the negative power supply end of the operational amplifier U1, the positive power supply end of the operational amplifier U2, the negative power supply end of the operational amplifier U2, the +V port of the driving chip U3 or the V- port of the driving chip U3 and is grounded through the capacitor C1 and the capacitor C2 respectively, the second end of the inductor L2 is connected with power supply and grounded through the capacitor C3.

5. The switchgear three-in-one sensor of claim 1, wherein: The ultrasonic partial discharge signal analog front end (1) comprises an interface U8 for accessing an air ultrasonic probe, an amplification chip U6, a switching chip U11, an operational amplifier U91, an operational amplifier U92, a diode D6, resistors R39, R40, R41, R43, R46, R47, R48, R49, R50, R51, R55, R56, R57, R58, R95, R96, capacitors C46, C47, C50, C51, C54, C56 and C113, the VIN+ port of the amplification chip U6 is connected with the first pin of the interface U8 through the resistor R43 and grounded through the resistor R56, the VIN- port of the amplification chip U6 is connected with the second pin of the interface U8 through the resistor R49 and grounded through the resistor R55, the RG1 port of the amplification chip U6 is connected with the COM port of the switching chip U11 and the RG2 port of the amplification chip U6 through the resistor R96, the NC port of the switching chip U11 is connected with the RG2 port of the amplification chip U6 through the resistor R39, the NO port of the switching chip U11 is connected with the RG2 port of the amplification chip U6 through the resistor R95, the VOUT port of the amplification chip U6 is connected with the first end of the resistor R46, the second end of the resistor R46 is connected with the inverting input terminal of the operational amplifier U91 through the capacitor C50 and the output terminal of the operational amplifier U91 through the capacitor C46, the second end of the resistor R46 is grounded through the resistor R51, the inverting input terminal of the operational amplifier U91 is connected with the output terminal of the operational amplifier U91 through the resistor R40, the output terminal of the operational amplifier U91 is connected with the first end of the resistor R47, the second end of the resistor R47 is connected with the inverting input terminal of the operational amplifier U92 through the capacitor C51 and the output terminal of the operational amplifier U92 through the capacitor C47, the second end of the resistor R47 is grounded through the resistor R50, the negative power supply terminal of the operational amplifier U91 is connected with the non-inverting input terminal of the operational amplifier U92 through the resistor R58, the inverting input terminal of the operational amplifier U92 is connected with the output terminal of the operational amplifier U92 through the resistor R41, the non-inverting input terminal of the operational amplifier U92 is grounded through the capacitor C113 and the resistor R57 respectively, the output terminal of the operational amplifier U92 is connected with the first end of the resistor R48, the second end of the resistor R48 is connected with the acquisition module (42) and grounded through the capacitor C54 and the diode D6 respectively.

6. A switchgear three-in-one sensor according to claim 5, characterized in that: The ultrasonic partial discharge signal analog front end (1) further comprises several second filter circuits, the V- port of the amplification chip U6, the V+ port of the amplification chip U6, the positive power supply terminal of the operational amplifier U91 and the negative power supply terminal of the operational amplifier U92 are respectively connected with the corresponding power supply through the respective second filter modules.

7. A switchgear three-in-one sensor according to claim 6, characterized in that: The second filter module comprises an inductor L8, a capacitor C43, a capacitor C44 and a capacitor C45, a first end of the inductor L8 is connected with a V- port of an amplification chip U6, a V+ port of the amplification chip U6, a positive power supply end of an operational amplifier U91 or a negative power supply end of an operational amplifier U92 and is grounded through the capacitor C44 and the capacitor C45 respectively, and a second end of the inductor L8 is connected with a power supply and grounded through the capacitor C43.

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