CN209264895U - Partial discharge of switchgear monitoring device - Google Patents

Abstract

The utility model discloses a kind of partial discharge of switchgear monitoring device, it include: monitoring unit include monitoring modular and detachable base, the monitoring modular includes sensor, the monitoring modular is connect by the detachable base with switchgear, the shelf depreciation situation of the monitoring modular real-time monitoring switchgear, wherein, the monitoring modular includes aluminium inner ring, stainless steel inner ring, aluminium inner ring armoured magnetic field interference, the stainless steel inner ring shields electric jamming, and control host shows the shelf depreciation situation of the switchgear of the real-time monitoring.By the above-mentioned means, not being not necessarily to shielding line line by the interference of external environment when can be realized monitoring switch cabinet shelf depreciation situation, ensureing that the data of the partial discharge of switchgear situation monitored are accurate.

Description

Partial discharge of switchgear monitoring device

Technical field

The utility model relates to technical field of electric power, more particularly to a kind of partial discharge of switchgear monitoring device.

Background technique

Longtime running or irregular operating due to electrical equipment, certain deterioration may occur for built-in electrical insulation, in height Under voltage and electric field environment, insulation performance will gradually decline, and will lead to shelf depreciation when serious, or even insulation breakdown and damage occurs Bad, once equipment is damaged, less serious case causes equipment fault to lose electric system, and severe one causes the even entire electricity of personnel's accident The collapse of net, occurrence of large-area have a power failure, it will bring huge economic loss to society.

It is electric system currently, having been widely used for 10kV, 35KV high-tension switch cabinet complete set of equipments in electric system In very important electrical equipment.Its reliability service is directly related to the power quality and power supply reliability of electric system. High-tension switch cabinet internal unit is numerous, and arrangement is more and more compacter, and insulation margin is smaller, especially in the sultryyer tide of summer air Electricity is climbed in wet south, equipment surface initiation.In long-term operational process, slowly by electricity, hot, chemical effect insulation There is aging or deterioration, causes electrical insulation strength to reduce, when electric field strength reaches disruptive field intensity, which just will appear Partial discharge phenomenon.Long-term shelf depreciation is damaged insulation degradation and is gradually expanded, and entire insulation breakdown or edge are in turn resulted in Face flashover, and then threaten to the safe operation of equipment, cause equipment to break down at runtime, so that system is caused to be stopped Electricity may cause the stop work and production of large area, caused by direct losses and indirect loss be huge.Obviously, to switchgear Carrying out Partial Discharge Detection can effectively find that the insulation defect of its internal early stage avoids it to take further measures Further development, improves the reliability of switchgear.

The scheme of currently used monitoring switch cabinet shelf depreciation, comprising: transient state ground potential method monitoring switch cabinet is locally put Electric scheme and supercritical ultrasonics technology monitoring switch cabinet shelf depreciation scheme.

One, transient state ground potential method monitoring switch cabinet shelf depreciation scheme

According to Maxwell's Theory of Electromagnetic Field, shelf depreciation can produce the electric field of variation, and the electric field of variation can evoke change The magnetic field of change, and changing magnetic field can induce electric field, the electric field of such alternation and magnetic field mutually excite and propagate outward just Form electromagnetic wave.For internal discharge, discharge electricity amount is mainly gathered at earth-shielded inner surface, therefore, if shielded layer It is that continuously then can not detect discharge signal in outside.But in fact, shielded layer usually washer junction, insulation position, The appearance of the positions such as cable insulation terminal is damaged and discontinuous, and the electromagnetic wave that such shelf depreciation generates will not be connected by shielded layer Continuous fractional transmission generates induced current to equipment surface, in equipment surface, and there are wave impedance for equipment surface, and then outside equipment Layer forms a TEV (Transient Earth Voltage, transient state ground potential).TEV method detection at present mostly uses capacitor coupling Detector is closed to detect the amplitude and discharge pulse frequency of shelf depreciation, for this method not as the means of quantitative measurment, two be to adopt Strength of discharge is indicated with opposite reading.This method is mainly used for comparative measurement, is detected by the longitudinal direction to individual equipment As a result it is analyzed, determines the variation tendency of its discharge activities, understand the insulation status of equipment, it can also be by identical conditions Lower same category of device carries out the lateral comparison of testing result, determines the sequencing of maintenance according to testing result, establishes for repair based on condition of component Determine solid foundation.The advantages of TEV detection method has: the electromagnetic signal communication process decaying of shelf depreciation is smaller, can be realized good Detection sensitivity: according to the decaying of electromagnetic pulse signal and the time difference, shelf depreciation positioning can be carried out；The detection of TEV sensor Effective frequency is high, frequency range is wide；It is more sensitive to the pace of change of pulse, proper media interior electric discharge, to electric discharge frequency Compose lower casing, terminal, insulator surface electric discharge it is insensitive.TEV method can carry out live detection to equipment, principle is simple, Installation and it is easy to operate, cost is relatively low, and can be monitored on-line, substantially increase the probability of discovering device insulation defect, To eliminate equipment deficiency and hidden danger in time, it is therefore widely used in the Partial Discharge Detection of high-tension switch cabinet.

Two, supercritical ultrasonics technology monitoring switch cabinet shelf depreciation scheme

When shelf depreciation occurs, in region of discharge, molecular motion is violent and mutually hits, and is macroscopically producing sound Wave, the usually sound wave by frequency greater than 20kHz are known as ultrasonic wave.Determined by the ultrasonic signal water that detection shelf depreciation generates The method of shelf depreciation is known as the ultrasonic Detection Method of shelf depreciation.It is below low that the noise of switchgear is concentrated mainly on 20kHz Within the scope of frequency, Partial Discharge Detection is carried out using supercritical ultrasonics technology, low-frequency disturbance range should be avoided and is to predominantly detect with high-frequency Object, but as the raising of frequency, sound wave also can be bigger in the decaying of communication process towel, be just unfavorable for the detection of signal and divide Analysis, therefore the frequency of ultrasonic wave Partial Discharge Detection is generally all tens of between hundreds of kHz.Typical ultrasonic sensor Centre frequency is typically secured on the shell for being detected switchgear, about near 40kHz using piezo-electric crystal as acoustic-electric Conversion elements.When it is internal discharges, the acoustic signals that shelf depreciation generates are transmitted to switchgear surface, are passed by ultrasonic wave Ultrasonic signal is converted to electric signal by sensor, and passes to acquisition system after being further amplified, to reach the mesh of detection shelf depreciation 's.Meanwhile ultrasonic signal has apparent directionality and is convenient for calculation delay, therefore can be by switchgear surface layout Multiple ultrasonic sensors, form detection and localization array, by calculate ultrasonic signal reach each sensor when ask difference, tie Spread speed of the chorus wave in switchgear can ask that position is accurately positioned to the sky at electric discharge position, so as to quick Debugging.

Referring to Figure 1, Fig. 1 is the structure of existing one embodiment of transient state ground potential method monitoring switch cabinet shelf depreciation device Schematic diagram.As shown in Figure 1, the transient state ground potential method monitoring switch cabinet shelf depreciation device includes transient state ground potential sensor, letter Number conditioning module and control host.The transient state ground potential method monitoring switch cabinet shelf depreciation device is needed in measurement by transient state Ground potential sensor is closely fixed on AIS (Air-Insulated Switchgear, cabinet use air insulation switchgear) and opens It closes in cabinet or GIS (Gas Insulated Switchgear, high-voltage switch gear cabinet equipment) switch cabinet equipment, transient state ground potential letter Number signal conditioning module can be input to by shielding line, transient state ground potential signal is sent to control after signal conditioning module is handled Host processed such as PC (personal computer, personal computer) machine or other display equipment are shown.

Fig. 2 is referred to, Fig. 2 is the structural representation of existing one embodiment of supercritical ultrasonics technology monitoring switch cabinet shelf depreciation device Figure.As shown in Fig. 2, the supercritical ultrasonics technology monitoring switch cabinet shelf depreciation device include ultrasonic sensor, signal conditioning module and Control host.In measurement, need closely for ultrasonic sensor to be fixed on GIS switchgear or GIS switch cabinet equipment On, ultrasonic signal can be input to signal conditioning module by shielding line, and ultrasonic signal is after signal conditioning module is handled Control host such as PC machine or other display equipment is sent to show.

Such as using the disadvantage of general method measurement ultrasonic wave shelf depreciation electricity and transient state ground potential shelf depreciation electricity at present Under: (1) at present in measurement ultrasonic wave shelf depreciation power mode since ultrasonic sensor be independently placed on switchgear outside, do not have Have by comprehensive shielding, therefore ultrasonic sensor is highly prone to some interference letters such as ambient noise and extraneous vibration signal Number influence, and it is exposed 1 meter or more of connecting line is up between sensor and signal conditioning module, even more become high frequency sense The source of noise is answered, these can all bring the error in measurement.

Currently used transient state ground potential method monitoring switch cabinet shelf depreciation scheme and supercritical ultrasonics technology monitoring switch cabinet part The shortcomings that discharge scheme, is as follows:

1, in existing transient state ground potential method monitoring switch cabinet shelf depreciation scheme, since ultrasonic sensor is independently put It sets outside switchgear, not by comprehensive shielding, therefore ultrasonic sensor is highly prone to external environmental interference as outside The influence of some interference signals such as boundary's noise or vibration signal, because the interference of external environment can bring the error in measurement.

2, in existing supercritical ultrasonics technology monitoring switch cabinet shelf depreciation scheme, the acquisition of transient state ground potential signal is usually adopted It is obtained with capacity coupled mode, collected transient state ground potential signal is very short, and very faint, general transient state ground potential The frequency highest of signal can achieve tens M, therefore the influence vulnerable to external environmental interference, if shielding has leakage, because outer The interference of boundary's environment can bring the error in measurement.

3, in existing transient state ground potential method monitoring switch cabinet shelf depreciation scheme and existing supercritical ultrasonics technology monitoring switch In cabinet shelf depreciation scheme, what is connected due to sensor and signal conditioning module is all shielding line, and shielding line is due to access times Increase and be easy breakage.

Utility model content

The purpose of this utility model is that proposing a kind of partial discharge of switchgear monitoring device, monitoring switch cabinet can be realized When shelf depreciation situation it is not necessarily to shielding line line, ensures the partial discharge of switchgear feelings monitored by the interference of external environment The data of condition are accurate.

One aspect according to the present utility model provides a kind of partial discharge of switchgear monitoring device, comprising:

Monitoring unit and control host, the monitoring unit control host machine wired or wireless connection with described；

The monitoring unit includes monitoring modular and detachable base, and the monitoring modular includes sensor, the monitoring Module is connect by the detachable base with switchgear, the shelf depreciation situation of the monitoring modular real-time monitoring switchgear, Wherein, the monitoring modular includes aluminium inner ring, stainless steel inner ring, the aluminium inner ring armoured magnetic field interference, the stainless steel Inner ring shields electric jamming, and the control host shows the shelf depreciation situation of the switchgear of the real-time monitoring.

Wherein, the monitoring modular, comprising:

Ultrasonic sensor, ultrasonic signal amplifier, low-pass filter, high-pass filter, analog-digital converter, digital signal Processor and network module；

The ultrasonic signal amplifier and the ultrasonic sensor, the low-pass filter, the Digital Signal Processing Device is respectively connected with, and the high-pass filter is respectively connected with the low-pass filter, the analog-digital converter, the number Signal processor is respectively connected with the ultrasonic signal amplifier, the analog-digital converter, the network module.

Wherein, the ultrasonic sensor is SR150N type ultrasonic sensor, and the ultrasonic signal amplifier is AD8065 type ultrasonic signal amplifier, the low-pass filter are 2 rank Butterworth LPFs, and the high-pass filter is 4 rank butterworth high pass filters, the analog-digital converter are AD9225 type analog-to-digital converter, and the digital signal processor is TMS320C28335 type digital signal processor, the network module are USR-C215b type wireless network modules.

Wherein, the monitoring modular, comprising:

Capacitive coupled sensors, signal amplification circuit, integral amplifier, filter, analog-digital converter, Digital Signal Processing Device and network module；

The signal amplification circuit and the capacitive coupled sensors, the integral amplifier, the Digital Signal Processing Device is respectively connected with, and the filter is respectively connected with the integral amplifier, the analog-digital converter, the digital signal Processor is respectively connected with the signal amplification circuit, the analog-digital converter, the network module.

Wherein, the signal amplification circuit is ADA4817 type signal amplification circuit, the integral amplifier be small drift and The high precision amplifier of temperature drift type, the filter are resistance-capacitance filters, and the analog-digital converter is AD9225 pattern number Converter, the digital signal processor are TMS320C28335 type digital signal processors, and the network module is USR- C215b type wireless network module.

It can be found that above scheme, monitoring modular may include aluminium inner ring, stainless steel inner ring, aluminium inner ring shielding Magnetic interference, the stainless steel inner ring shield electric jamming, which can be monitored in real time the shelf depreciation situation of switchgear, Not by the interference of external environment when can be realized monitoring switch cabinet shelf depreciation situation, it is not necessarily to shielding line line, guarantee monitors Partial discharge of switchgear situation data it is accurate.

Further, above scheme, monitoring modular can be connect with switchgear by detachable base, can be realized and pass through Detachable base is replaced, which can be placed on different switchgear products.

Detailed description of the invention

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor Under, it is also possible to obtain other drawings based on these drawings.

Fig. 1 is the structural schematic diagram of existing one embodiment of transient state ground potential method monitoring switch cabinet shelf depreciation device；

Fig. 2 is the structural schematic diagram of existing one embodiment of supercritical ultrasonics technology monitoring switch cabinet shelf depreciation device；

Fig. 3 is the structural schematic diagram of one embodiment of the utility model partial discharge of switchgear monitoring device；

Fig. 4 is an example schematic of the cross section structure of the utility model monitoring unit；

Fig. 5 is an example schematic of the cross-sectional structure of the utility model monitoring modular；

Fig. 6 is the structural schematic diagram of one embodiment of the utility model monitoring modular；

Fig. 7 is the structural schematic diagram of another embodiment of the utility model monitoring modular.

Specific embodiment

With reference to the accompanying drawings and examples, the utility model is described in further detail.It is emphasized that following Embodiment is merely to illustrate the utility model, but is not defined to the scope of the utility model.Likewise, following embodiment is only For the utility model section Example and not all embodiments, those of ordinary skill in the art are not making creative work Under the premise of all other embodiment obtained, fall within the protection scope of the utility model.

The utility model provides a kind of partial discharge of switchgear monitoring device, can be realized monitoring switch cabinet shelf depreciation feelings It is not necessarily to shielding line line by the interference of external environment when condition, ensures that the data of the partial discharge of switchgear situation monitored are quasi- Really.

Fig. 3 is referred to, Fig. 3 is the structural schematic diagram of one embodiment of the utility model partial discharge of switchgear monitoring device. In the present embodiment, which includes monitoring unit 31 and control host 32.

The monitoring unit 31 and the wired or wireless connection of control host 32.

The monitoring unit 31, including monitoring modular (not indicated in figure) and detachable base (not indicated in figure), the monitoring Module includes sensor (not indicating in figure), which is connect by the detachable base with switchgear, the monitoring modular The shelf depreciation situation of real-time monitoring switchgear；Wherein, the monitoring modular may include aluminium inner ring (not indicated in figure), it is stainless Steel inner ring (does not mark ticket) in figure, aluminium inner ring armoured magnetic field interference, the stainless steel inner ring shields electric jamming.

The control host 32, the shelf depreciation situation of the switchgear for showing the real-time monitoring.

In the present embodiment, the material of the detachable base can be made of ferromagnetic material, different switchgear products Using different pedestals, so that the monitoring unit 31 can be firmly adsorbed on tested switchgear product.

It in the present embodiment, can be in the 31 inside encapsulating epoxy glue of monitoring unit etc., to reinforce the monitoring unit 31 Fastness.Fig. 4 is referred to, Fig. 4 is an example schematic of the cross section structure of the utility model monitoring unit.As shown in figure 4, should Monitoring unit may include network interface, switch, indicator light etc..

In the present embodiment, since the sensor such as ultrasonic sensor or transient state ground potential sensor etc. receive all It is extremely weak signal, therefore the monitoring modular can be designed using double shield.Under normal circumstances, real-time monitoring disturbing factor master Will be from external electrical field and magnetic field, therefore double shield design should mainly be interfered to consider for electric and magnetic fields.Electromagnetic field The effect of shielding is related with a distance from shield etc. with material, thickness, wave frequency and interference source.To the screen of electric jamming It covers, generallys use high conductivity, the copper material of low magnetic permeability or aluminium as shielding material.The shielding in magnetic field will be selected not Easy magnetically saturated material, such as silicon steel, stainless steel；Therefore we, which have been wrapped up in monitoring modular such as aluminium and stainless steel, distinguishes To shield electric and magnetic fields interference.Fig. 5 is referred to, Fig. 5 is that one action of the cross-sectional structure of the utility model monitoring modular illustrates It is intended to.As shown in figure 5, the monitoring modular may include aluminium inner ring, stainless steel inner ring.

In the present embodiment, which can receive ultrasonic signal caused by partial discharge of switchgear, acquisition The ultrasonic signal arrived can be realized by the circuit of some column to the amplification of signal, filtering and A/D (Analog-to-Digital Convert, analog-to-digital conversion) conversion, finally handled via DSP (Digital Signal Processing, Digital Signal Processing) Device carries out Fourier's calculating, obtains required partial discharge of switchgear amount.

Fig. 6 is referred to, Fig. 6 is the structural schematic diagram of one embodiment of the utility model monitoring modular.In the present embodiment, the prison Surveying module 60 includes ultrasonic sensor 61, ultrasonic signal amplifier 62, low-pass filter 63, high-pass filter 64, modulus turn Parallel operation 65, digital signal processor 66 and network module 67.

The ultrasonic signal amplifier 62 and the ultrasonic sensor 61, the low-pass filter 63, the digital signal processor 66 are respectively connected with.

The high-pass filter 64 is respectively connected with the low-pass filter 63, the analog-digital converter 65.

The digital signal processor 66 divides with the ultrasonic signal amplifier 62, the analog-digital converter 65, the network module 67 It is not connected.

Optionally, which can be SR150N type ultrasonic sensor.To the ultrasonic sensor 61 Specific product model, the utility model is not limited.

Optionally, which can be AD8065 type ultrasonic signal amplifier.The ultrasonic signal is put The specific product model of big device 62, the utility model are not limited.

Optionally, which can be 2 rank Butterworth LPFs, the 2 rank Butterworth low pass The cutoff frequency of wave device is 100KHz.To the specific product model of the low-pass filter 63, the utility model is not limited.

Optionally, which can be 4 rank butterworth high pass filters, 4 rank Butterworth high pass filter The cutoff frequency of wave device is 20KHz.To the specific product model of the high-pass filter 64, the utility model is not limited.

Optionally, which can be AD9225 type analog-to-digital converter.To the specific of the analog-digital converter 65 Product type, the utility model are not limited.

Optionally, which can be TMS320C28335 type digital signal processor.To the number The specific product model of signal processor 66, the utility model are not limited.

Optionally, which can be USR-C215b type wireless network module.To the tool of the network module 67 Body product type, the utility model are not limited.

In the present embodiment, under normal circumstances, the frequency of the ultrasonic signal as caused by partial discharge of switchgear is most For 20kHz-150kHz, wherein the frequency of most of discharge informations concentrates between 30kHz-70kHz, the ultrasonic sensor 61 can choose SR150N type ultrasonic sensor, and the detection bandwidth range of the ultrasonic sensor is 12kHz-220kHz, and The ultrasonic sensor is decayed very little in 20KHz-140KHz frequency range, meets very much demand.

In the present embodiment, which can be AD8065 type ultrasonic signal amplifier, the AD8065 Type ultrasonic signal amplifier is high-performance multistage amplifier circuit, and the series of amplifying circuit is carried out anti-by digital information processing system Feedback.As known from the above, the electric signal which obtains has the feature that amplitude is small, frequency is high, it is therefore necessary to select Select a high input impedance, high bandwidth and high-precision ultrasonic signal amplifier 62.The AD8065 type ultrasonic signal amplifier is A performance is outstanding and voltage feedback type amplifier easy to use, the AD8065 type ultrasonic signal amplifier can use ADI The proprietary technique of (Analog Devices, Inc., Ya De promise semiconductor company) company manufactures, and work noise is extremely low, input resistance It is anti-very high.The AD8065 type ultrasonic signal amplifier has 5V (volt) to the wide power voltage range of 24V, and single supply can be used Power supply, bandwidth are 145MHz (megahertz), are suitble to various applications.In addition, the AD8065 type ultrasonic signal amplifier is also arrived with rail Rail output, keeps its function more diversified.

In the present embodiment, the interference such as extraneous environmental noise and the external world due to the monitoring modular 60 vulnerable to external environment Ambient vibration signal etc., the purpose of filtering are exactly to filter out these interference signals, obtain the switchgear electric discharge less containing interference signal Signal.In the present embodiment, the low-pass filter 63 and the high-pass filter 64 can be used to eliminate the interference of external environment. In the present embodiment, which can be 2 rank Butterworth LPFs, the 2 rank Butterworth low pass wave The cutoff frequency of device can be 100KHz, which can be 4 rank butterworth high pass filters, 4 rank Bart The cutoff frequency of Butterworth high-pass filter can be 20KHz.Then filtered signal is sent into the analog-digital converter 65, is turned Change into meet 66 input requirements of digital signal processor digital signal be sent into the digital signal processor 66 carry out it is subsequent Processing.

In the present embodiment, the data acquisition of high speed and caching are the core circuit of the monitoring module 60, the analog-to-digital conversion Device 65 needs to carry out collected analog signal analog quantization, encodes, is then converted into digital quantity storage in the buffer, waits The reading of the digital signal processor 66.In the present embodiment, which can choose AD9225 type analog-to-digital conversion Device.The AD9225 type analog-to-digital converter sampling rate with higher, conversion accuracy 12, highest are converted to rate 25MHz, should It is integrated with high performance sampling in AD9225 type analog-to-digital converter and keeps amplifying circuit and reference power source.The AD9225 pattern number turns Parallel operation is configured with level Four difference flowing structure error correction circuit, to ensure that the high-speed data of 12 bit resolutions correctly samples.

In the present embodiment, which is the control centre of the monitoring modular 60, mainly to the modulus The signal that converter 65 samples carries out Digital Signal Processing and discharge capacity analysis and carries out some conventional peripheral control packets It includes and the network module 67 is driven to carry out network communication etc..In the present embodiment, which can choose TMS320C28335 type digital signal processor.The TMS320C28335 type digital signal processor is TI (Texas Instruments, Texas Instrument) company a TMS320C28X series high performance float-point digital signal processor.With this The previous fixed DSP of TMS320C28335 type digital signal processor is compared, high, at low cost, small power consumption, performance with precision The features such as high, peripheral hardware integrated level height, data and program amount of storage are greatly and analog-to-digital conversion is more accurate quick.The TMS320C28335 Type digital signal processor has the high speed processing ability of 150MHz, there is PWM (the Pulse Width on up to 18 tunnels Modulation, pulse width modulation) output, wherein there is the PWM that 6 tunnels are the distinctive higher precision of TI to export.The digital signal Processor 66 has benefited from its FPU Float Point Unit, and it is excessive without expending in processing decimal operation can quickly to write control algolithm Time and efforts, compared with former generation digital signal processor, average behavior improve 50%, and with fixed point C28x controller software It is compatible, to simplify software development, shorten the development cycle, reduces development cost.

In the present embodiment, which can choose the wireless WIFI (WIreless- of USR-C215b type FIdelity, Wireless Fidelity) module, baseband chip, radio-frequency receiving-transmitting list are integrated in the wireless WIFI module of USR-C215b type Member and power amplifier etc.；Low power operation mechanism built in WIFI module that the USR-C215b type is wireless, can effectively realize The low power operation of module；WIFI module that the USR-C215b type is wireless supports WIFI agreement and TCP/IP (Transmission Control Protocol/Internet Protocol, network communication protocol) agreement, it is only necessary to easy configuration can be realized The connection of UART (Universal Asynchronous Receiver/Transmitter, universal asynchronous receiving-transmitting transmitter) equipment Net function, the data that the digital signal processor 66 processing can be obtained in practice, is sent out by the network module 67 It is sent to the external control host.

Optionally, which can also include the first power supply module (not indicating in figure), first power supply module Lithium battery be can choose to be powered, which can persistently power 24 hours to the monitoring module 60 or more, It can recorde whole one day partial discharge of switchgear situation.In addition it not only may be implemented using power supply adaptor to the lithium battery Charging, is also used as the power supply for a long time to first power supply module 60.It in the present embodiment, can be to power supply electricity Road and the analog-digital converter 65 carry out full-shield processing respectively, can the effectively caused interference of shielded power supply adapter.

Fig. 7 is referred to, Fig. 7 is the structural schematic diagram of another embodiment of the utility model monitoring modular.It, should in the present embodiment Monitoring modular 70 includes capacitive coupled sensors 71, signal amplification circuit 72, integral amplifier 73, filter 74, analog-to-digital conversion Device 75, digital signal processor 76 and network module 77.

The signal amplification circuit 72 and the capacitive coupled sensors 71, the integral amplifier 73, the digital signal processor 76 are respectively connected with.

The filter 74 is respectively connected with the integral amplifier 73, the analog-digital converter 75.

The digital signal processor 76 and the signal amplification circuit 72, the analog-digital converter 75, the network module 77 are distinguished It is connected.

Optionally, which can be ADA4817 type signal amplification circuit.To the signal amplification circuit 72 Specific product model, the utility model is not limited.

Optionally, which can be the high precision amplifier of small drift and temperature drift type.The integral is amplified The specific product model of device 73, the utility model are not limited.

Optionally, which can be RC (Resistor-Capacitance, resistance-capacitance) filter.To this The specific product model of filter 74, the utility model are not limited.

In the present embodiment, the transient state ground potential TEV signal sensed due to the capacitive coupled sensors 71 is lower, It needs first to amplify processing to transient state ground potential TEV signal.The signal amplification circuit 72 can choose ADI company ADA4817 type signal amplification circuit, the ADA4817 type signal amplification circuit have such as 1.5pF (pico farad) input capacitance, low noise Sound, low maladjustment voltage and better suited bandwidth, so that before the ADA4817 type signal amplification circuit is very suitable to data acquisition End and broadband mutual conductance application.

In the present embodiment, since transient state ground potential TEV signal is very of short duration and is highly prone to interfere, the integral amplifier Amplified signal can be passed to integral element by 73, so that signal errors is eliminated, so the correct selection of the integral amplifier 73 is extremely closed It is important.Because the problems such as drift and temperature drift makes the output of the integral amplifier 73 progress into saturation state, to lose integral The integral action of device, therefore selected in Selecting operation amplifier the high precision amplifier of drift, temperature drift very little.

In the present embodiment, which is the signal allowed by within the scope of certain frequency, cuts down the frequency range Signal in addition.Since ideal amplitude-frequency characteristic filter is difficult to realize, which can choose the amplitude-frequency of RC filter The mode that characteristic is approached.And the amplitude-frequency characteristic of RC filter is inversely proportional with its phase-frequency characteristic, amplitude-frequency characteristic is better, and phase-frequency characteristic is just It is poorer.Order is higher simultaneously, and the accuracy of filter is higher, and the speed of amplitude-frequency characteristic decaying is faster, but order is higher, RC filtering The joint number of device network is more, and component parameters calculating is relatively cumbersome, and circuit debugging is also extremely difficult.The frequency band of the filter 74 Width can be 5-50MHz.

Capacitive coupled sensors 71, signal amplification circuit 72, integral amplifier 73, filter 74, analog-digital converter 75, number Word signal processor 76 and network module 77.

Ultrasonic sensor 61, ultrasonic signal amplifier 62, low-pass filter 63, high-pass filter 64, analog-digital converter 65, digital signal processor 66 and network module 67.

In the present embodiment, the analog-digital converter 75 is identical as the structure of the analog-digital converter 65, function and connection relationship, The digital signal processor 76 is identical with the structure, function and connection relationship of the digital signal processor 66, the network module 77 It is identical as the structure of the network module 67, function and connection relationship, thus herein not to the analog-digital converter 75, the digital signal at Reason device 76 and the network module 77 are repeated respectively, refer to the above corresponding explanation.

Optionally, which can also include the second power supply module (not indicating in figure), second power supply module It is identical as the structure of first power supply module, function and connection relationship, therefore second power supply module is not repeated herein, in detail Carefully refer to the above corresponding explanation.

It can be found that above scheme, monitoring modular may include aluminium inner ring, stainless steel inner ring, aluminium inner ring shielding Magnetic interference, the stainless steel inner ring shield electric jamming, which can be monitored in real time the shelf depreciation situation of switchgear, Not by the interference of external environment when can be realized monitoring switch cabinet shelf depreciation situation, it is not necessarily to shielding line line, guarantee monitors Partial discharge of switchgear situation data it is accurate.

Further, above scheme, monitoring modular can be connect with switchgear by detachable base, can be realized and pass through Detachable base is replaced, which can be placed on different switchgear products.

It should be noted that each unit module in the monitoring modular is all common unit module, the utility model Technical solution realize, do not need to do software program any improvement, hereby give notice that.

It should be understood by those ordinary skilled in the art that: the discussion of any of the above embodiment is exemplary only, not It is intended to imply that the scope of the present disclosure (including claim) is limited to these examples；Under the thinking of the utility model, the above reality Applying can also be combined between the technical characteristic in example or different embodiments, and step can be realized with random order, and be deposited In many other variations of the different aspect of the utility model as described above, for simplicity, they are not provided in details.

In addition, to simplify explanation and discussing, and in order not to which the utility model indigestion can be made, in provided attached drawing In can show or can not show and connect with the well known power ground of integrated circuit (IC) chip and other components.In addition, Device can be shown in block diagram form, to avoid making the utility model indigestion, and this has also contemplated following facts, Details i.e. about the embodiment of these block diagram arrangements be height depend on will implement the utility model platform (that is, These details should be completely within the scope of the understanding of those skilled in the art).Elaborate detail (for example, circuit) with In the case where the exemplary embodiment for describing the utility model, it will be apparent to those skilled in the art that can be Without implementing the utility model in the case where these details or in the case that these details change.Therefore, this A little descriptions should be considered as illustrative rather than restrictive.

Although having been incorporated with specific embodiment of the utility model the utility model is described, before The description in face, many replacements of these embodiments, modifications and variations will be apparent for those of ordinary skills 's.For example, discussed embodiment can be used in other memory architectures (for example, dynamic ram (DRAM)).

The embodiments of the present invention are intended to cover fall into all such within the broad range of appended claims Replacement, modifications and variations.Therefore, within the spirit and principle of the utility model, any omission for being made, modification, equivalent Replacement, improvement etc., should be included within the scope of protection of this utility model.

Claims (5)

1. a kind of partial discharge of switchgear monitoring device characterized by comprising

Monitoring unit and control host, the monitoring unit control host machine wired or wireless connection with described；

The monitoring unit includes monitoring modular and detachable base, and the monitoring modular includes sensor, the monitoring modular It is connect by the detachable base with switchgear, the shelf depreciation situation of the monitoring modular real-time monitoring switchgear, wherein The monitoring modular includes aluminium inner ring, stainless steel inner ring, the aluminium inner ring armoured magnetic field interference, the stainless steel inner ring screen Electric jamming is covered, the control host shows the shelf depreciation situation of the switchgear of the real-time monitoring.

2. partial discharge of switchgear monitoring device as described in claim 1, which is characterized in that the monitoring modular, comprising:

Ultrasonic sensor, ultrasonic signal amplifier, low-pass filter, high-pass filter, analog-digital converter, Digital Signal Processing Device and network module；

The ultrasonic signal amplifier and the ultrasonic sensor, the low-pass filter, the digital signal processor point It is not connected, the high-pass filter is respectively connected with the low-pass filter, the analog-digital converter, the digital signal Processor is respectively connected with the ultrasonic signal amplifier, the analog-digital converter, the network module.

3. partial discharge of switchgear monitoring device as claimed in claim 2, which is characterized in that the ultrasonic sensor is SR150N type ultrasonic sensor, the ultrasonic signal amplifier are AD8065 type ultrasonic signal amplifier, the low-pass filtering Device is 2 rank Butterworth LPFs, and the high-pass filter is 4 rank butterworth high pass filters, the analog-to-digital conversion Device is AD9225 type analog-to-digital converter, and the digital signal processor is TMS320C28335 type digital signal processor, described Network module is USR-C215b type wireless network module.

4. partial discharge of switchgear monitoring device as described in claim 1, which is characterized in that the monitoring modular, comprising:

Capacitive coupled sensors, signal amplification circuit, integral amplifier, filter, analog-digital converter, digital signal processor and Network module；

The signal amplification circuit and the capacitive coupled sensors, the integral amplifier, the digital signal processor point It is not connected, the filter is respectively connected with the integral amplifier, the analog-digital converter, the Digital Signal Processing Device is respectively connected with the signal amplification circuit, the analog-digital converter, the network module.

5. partial discharge of switchgear monitoring device as claimed in claim 4, which is characterized in that the signal amplification circuit is ADA4817 type signal amplification circuit, the integral amplifier are the high precision amplifier of small drift and temperature drift type, the filter It is resistance-capacitance filter, the analog-digital converter is AD9225 type analog-to-digital converter, and the digital signal processor is TMS320C28335 type digital signal processor, the network module are USR-C215b type wireless network modules.