CN104360252B - A kind of variable connector cabinet acoustoelectric signal harvester and method - Google Patents
A kind of variable connector cabinet acoustoelectric signal harvester and method Download PDFInfo
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Abstract
A kind of variable connector cabinet acoustoelectric signal harvester and method, including paired sensor assembly, pair signals conditioning module, master control collection analysis circuit module, power supply unit, backstage, first substrate and second substrate；Pair signals conditioning module is fixed on the first substrate, and master control collection analysis circuit module, power supply unit are fixed on second substrate；The local discharge signal of sensor assembly switch cubicle delivers to pair signals conditioning module, the signal that pair signals conditioning module will be received is filtered, amplifies, carry out A/D conversions after peak detection process, signal after conversion is sent to master control collection analysis circuit module, data operation treatment is carried out by master control collection analysis circuit module, local discharge characteristic data are extracted, and Monitoring Data is uploaded to backstage, meanwhile, realize that LCD screen shows on the spot by way of extension with reference to master control collection analysis circuit module；Solve the problems, such as that switchgear discharge examination is inconvenient, workload is big, Monitoring Data cannot be realized remotely checking.
Description
Technical field
The present invention relates to signal detection apparatus and method, the more particularly to signal supervisory instrument and method of switchgear.
Background technology
According to two groups of ASSOCIATE STATISTICSs, one group of statistical result showed, during 1989~1997 years and 2004,40.5kV with
In the fault type of lower voltage class switchgear, insulation failure accounts for 30%~53% with current-carrying failure (containing obstacle)；
And another group of statistical result showed, during 1992~2002 years, in switchgear fault type, insulation failure and current-carrying
The ratio of failure has been up to 66%.Insulation failure and current-carrying failure in above-mentioned two groups of ASSOCIATE STATISTICS results, with electric discharge
Phenomenon is closely related.
At present in the institute of switchgear is faulty, the failure for having up to 44% can be by Partial Discharge Detecting Technology
Detect, wherein, 85% destructive malfunction is all relevant with partial discharge phenomenon, therefore, medium voltage switchgear equipment is implemented
Discharge examination or monitoring can substantially reduce the probability of malfunction of controller switching equipment.
It is used to mainly there are the means that medium voltage switchgear equipment implements discharge examination or monitoring handheld instrument and portable at present
Formula instrument patrols and examines test, but these modes have engendered that cabinet external noise is big, ultrasonic wave cannot spirit in actual applications
It is quick detection good airproof performance switch cubicle and by switch cubicle position limitation (such as the back side cannot be detected), person works amount increase greatly
Plus the problems such as；
In addition, although TEV sensors and ultrasonic sensor are embedded in switch cabinet bus cabin, breaker at present
In cabin, cable tank room, but the result and data of its monitoring are also that display device on cabinet is shown, are still needed to existing
Field is checked that due to that cannot carry out data upload, therefore inconvenient operations staff directly checks data in Central Control Room or remotely.
The content of the invention
It is an object of the invention to provide a kind of variable connector cabinet acoustoelectric signal harvester and method, solve at present to switch
Equipment discharge examination is inconvenient, workload is big, Monitoring Data cannot realize the long-range problem checked.
To solve the above problems, a kind of variable connector cabinet acoustoelectric signal harvester that the present invention is provided, including sensor
Module, master control collection analysis circuit module, power supply unit, backstage；Sensor assembly is by TEV sensors and ultrasonic sensor group
Into；Sensor assembly is embedded in switch cubicle；Power supply unit is used to provide power supply；Backstage is used to for Monitoring Data to carry out electric discharge width
Value, the displaying of historical data curve；Additionally, also including pair signals conditioning module；Pair signals conditioning module is by TEV signal conditions
Circuit module, ultrasonic signal conditioning circuit module, two AD conversion module compositions；The signal output part and TEV of TEV sensors
The electrical connection of signal conditioning circuit module by signal input, TEV signal conditioning circuit module by signal output ends and an AD conversion mould
Block signal input is electrically connected；The signal output part of ultrasonic sensor and the signal input of ultrasonic signal conditioning circuit module
End electrical connection, ultrasonic signal conditioning circuit module signal output part is electrically connected with another AD conversion module signal input part；
The signal input part of two AD conversion modules with master control collection analysis circuit module is electrically connected；Master control collection analysis circuit module
Communication interface be connected with backstage.
TEV signal conditioning circuits module includes TEV signaling multilevels filter circuit, TEV signals logarithmic amplifying circuit, TEV letters
Number peak-detector circuit；Wherein, TEV signaling multilevels filter circuit is used to filter the signal beyond 3-100MHz；TEV signaling multilevels
Filter circuit is processed the analog signal of TEV sensor feed-ins, limits its bandwidth, reduce external environment condition electromagnetic interference and
Improve the sensitivity of Partial Discharge Detection；TEV signals logarithmic amplifying circuit is used to carry out non-linear putting to transient earth voltage signal
Greatly, the signal to violent electric discharge phenomena carries out volitional check amplitude；TEV signal peaks detecting circuit is used for short to the duration
Local discharge signal to ps grades is processed, and extracts the amplitude signal mostly important to Partial Discharge Detection；TEV signal peaks
The setting of detecting circuit sample rate is not less than 1MHz.
Ultrasonic signal conditioning circuit module includes ultrasonic signal pre-amplification circuit, ultrasonic signal bandpass filtering electricity
Road, ultrasonic signal logarithmic amplification electricity, ultrasonic signal peak-detector circuit；Wherein ultrasonic signal pre-amplification circuit is responsible for
Small-signal for ultrasonic sensor to be exported is amplified, and improves the antijamming capability of signal；Ultrasonic signal band logical
The a width of 20kHz to 100kHz of band of filter circuit；Ultrasonic signal bandwidth-limited circuit is responsible for entering one to input ultrasonic signal
Step frequency-selecting, is disturbed with the background audio signals for suppressing spuious；Output after bandpass filter frequency-selecting be used for logarithmic amplification, detection and
Analog-to-digital conversion；Ultrasonic signal logarithmic amplifying circuit is used to carry out non-linear amplification to ultrasonic signal, existing to violent electric discharge
The signal of elephant carries out volitional check amplitude；The part that ultrasonic signal peak-detector circuit is used to be as short as the duration ps grades is put
Electric signal is processed, and extracts the amplitude signal mostly important to Partial Discharge Detection；Ultrasonic signal peak-detector circuit is adopted
The setting of sample rate is not less than 1MHz.
TEV signal conditioning circuit modules are covered by radome；The signal input part of TEV signal conditioning circuit modules is through BNC
Interface connects the signal output part of TEV sensors；
Ultrasonic signal conditioning circuit module is covered by radome；The signal input part of ultrasonic signal conditioning circuit module
The signal output part of ultrasonic sensor is connected through another bnc interface；
Two signal output parts of AD conversion module are electrically connected with FPC, and FPC through winding displacement and master control collection analysis electricity
The signal input part electrical connection of road module.
Pair signals conditioning module is fixed on the first substrate through the first contact pin connector；
Master control collection analysis circuit module, power supply unit are each attached on second substrate；
Master control collection analysis circuit module includes mainboard, expansion interface, 485 interfaces and minimum system plate；Mainboard is arranged on
On second substrate；Expansion interface and 485 interfaces are drawn by mainboard；Minimum system plate is arranged on mainboard, and through contact pin connector
It is connected with mainboard；The signal input part of minimum system plate is connected through winding displacement with FPC.
After minimum system plate is received from the switch cubicle discharge signal after the treatment of pair signals conditioning module, to therein temporary
State ground voltage signal and ultrasonic signal extract local discharge characteristic data, and eventually through the RS485 interfaces that mainboard is drawn with
Monitoring Data is uploaded Modbus agreements the backstage for supporting the agreement.
LCD display is connected with expansion interface, realizes that LCD screen shows on the spot.
Power supply unit is protected by radome；The output end of power supply unit draws the second contact pin connector, the connection of the second contact pin
Device is connected through solder joint with the power input lead of master control collection analysis circuit module；The power input of power supply unit is drawn another
One group of second contact pin connector, the contact pin connector of group second is connected through another group of solder joint with power interface.
TEV signaling multilevel filter circuits are：The input of TEV signaling multilevel filter circuits is sequentially connected in series between output end
Access electric capacity C5, resistance R8, inductance L1With inductance L2；In TEV signaling multilevel filter circuit inputs and electric capacity C5Between select a knot
Point, the node respectively with diode D1Positive pole, diode D2Negative pole connection；Diode D1Negative pole and+5V voltages it is indirectly
Enter resistance R1；Diode D1With resistance R1Between select a node, resistance R is accessed between the node and earth terminal3, resistance R2And electricity
Hold C2With resistance R after series connection3It is in parallel；Resistance R1A node is selected and+5V voltages between, electric capacity is accessed between the node and earth terminal
C1；Diode D2Positive pole and -5V voltages between access resistance R4；Diode D2With resistance R4Between select a node, in the node
Resistance R is accessed and earth terminal between6, resistance R5With electric capacity C4With resistance R after series connection6It is in parallel；Resistance R4One is selected and -5V voltages between
Node, accesses electric capacity C between the node and earth terminal3；In electric capacity C5With resistance R8Between select a node, the node and earth terminal
Between access resistance R7；In resistance R8With inductance L1Between select a node, it is in parallel between the node and earth terminal to access resistance R9、
Electric capacity C6, electric capacity C7；In inductance L1With inductance L2Between select a node, it is in parallel between the node and earth terminal to access electric capacity C8, electricity
Hold C9；In inductance L2A node is selected and the output end of TEV signaling multilevel filter circuits between, it is in parallel between the node and earth terminal
Access electric capacity C10, electric capacity C11, resistance R10；
TEV signal logarithmic amplifying circuits are：TEV signal logarithmic amplifying circuit inputs and logafier AD8310's
Electric capacity C is accessed between INHI pins12, electric capacity C12A node is selected between INHI pins, is accessed between the node and earth terminal
Resistance R11；Electric capacity C is accessed between the INLO pins and earth terminal of logafier AD831015；Logafier AD8310's
Resistance R is accessed between INHI pins and INLO pins13；The COMM pins ground connection of logafier AD8310；Logafier
Electric capacity C is accessed between the BFIN pins and earth terminal of AD831014；Access resistance is sequentially connected in series between+5V voltages and earth terminal
R12, electric capacity C13；Resistance R12With electric capacity C13Between select a node to connect ENBL pins, the Vpos of logafier AD8310 simultaneously
Pin；Electric capacity C is accessed between the OFLT pins and earth terminal of logafier AD831016；The Vout of logafier AD8310
Pin extraction wire as TEV signal logarithmic amplifying circuits signal output part；
TEV signal peak detecting circuits are：The pin 3 of operational amplifier A D8066 is used as signal input part；Operation amplifier
Resistance R is accessed between the pin 8 and+5V voltages of device AD806614；In the pin 8 and resistance R of operational amplifier A D806614Between
A node is selected, electric capacity C is accessed between the node and earth terminal17；The pin 4 of operational amplifier A D8066 is with -5V voltages indirectly
Enter resistance R16；Electric capacity C is accessed between the pin 4 and earth terminal of operational amplifier A D806618；The pipe of operational amplifier A D8066
The difference connecting resistance of pin 2 R15One end, diode D3Negative pole, resistance R15Another termination -5V voltages, diode D3Positive pole connect
The pin 1 of operational amplifier A D8066；The pin 1 of operational amplifier A D8066 meets diode D4Positive pole, diode D4Negative pole
Connect the pin 5 of operational amplifier A D8056；In diode D4Negative pole and the pin 5 of operational amplifier A D8056 between select a knot
Point, accesses electric capacity C between the node and earth terminal19, resistance R is accessed between the node and -5V17；Operational amplifier A D8056's
Pin 4 and pin 8 are in high-impedance state；The adapter pin 7 of pin 6 of operational amplifier A D8056；The pipe of operational amplifier A D8056
The extraction wire of pin 7, as the signal output part of TEV signal peak detecting circuits.
Ultrasonic signal pre-amplification circuit is：The signal input part and first instrument of ultrasonic signal pre-amplification circuit
Electric capacity C is accessed between the pin 3 of amplifier INA12821；Between the pin 2 and earth point of first instrument amplifier INA128 successively
Series connection accesses electric capacity C20、R18；Access resistance R is sequentially connected in series between the pin 2 and pin 3 of first instrument amplifier INA12819、
Resistance R20；In resistance R19With resistance R20Between select a node be grounded；The pin 1 and pin 8 of first instrument amplifier INA128 it
Between access resistance R21；Access resistance R is sequentially connected in series between+5V voltages and earth terminal22, electric capacity C22；In resistance R22With electric capacity C22
Between select a node to be connected with the pin 7 of first instrument amplifier INA128；Access is sequentially connected in series between -5V voltages and earth terminal
Resistance R23, electric capacity C23；Resistance R23With electric capacity C23Between select a node and the pin 4 of first instrument amplifier INA128 to connect；The
Electric capacity C is accessed between the pin 6 of one instrument amplifier INA128 and the pin 3 of second instrument amplifier INA12824；In the second instrument
The pin 3 and electric capacity C of table amplifier INA12824Between select a node, resistance R is accessed between the node and earth terminal24；Second
The pin 2 of instrument amplifier INA128 pin 7, first instrument amplifier INA128 successively with first instrument amplifier INA128
Pin 5, second instrument amplifier INA128 pin 5 connect after be grounded；The pin 1 and pipe of second instrument amplifier INA128
Resistance R is accessed between pin 826；Access resistance R is sequentially connected in series between+5V voltages and earth terminal25, electric capacity C25；In resistance R25And electricity
Hold C25Between select a node to be connected with the pin 7 of second instrument amplifier INA128；It is sequentially connected in series between -5V voltages and earth terminal
Access resistance R27, electric capacity C26；Resistance R27With electric capacity C26Between select a node and the pin 4 of second instrument amplifier INA128 to connect
Connect；Access is sequentially connected in series between the pin 6 of second instrument amplifier INA128 and the pin 2 of Voltage Feedback dual amplifier AD8058
Electric capacity C27, resistance R28, electric capacity C30；In resistance R28With electric capacity C30Between select a node, between the node and earth terminal access electricity
Resistance R29, while being sequentially connected in series access electric capacity C between the pin 2 of the node and Voltage Feedback dual amplifier AD805829, resistance R31；
Electric capacity C29With resistance R31Between select a node, the node is connected with the pin 1 of Voltage Feedback dual amplifier AD8058；Voltage is anti-
Resistance R is accessed between the pin 3 and earth terminal of feedback dual amplifier AD805830；Access is sequentially connected in series between+5V voltages and earth terminal
Resistance R32, electric capacity C31；In resistance R32With electric capacity C31Between select a node to connect with the pin 8 of Voltage Feedback dual amplifier AD8058
Connect；Access resistance R is sequentially connected in series between -5V voltages and earth terminal33, electric capacity C28；In resistance R33With electric capacity C28Between select a node
Pin 4 with Voltage Feedback dual amplifier AD8058 is connected；The pin 1 of Voltage Feedback dual amplifier AD8058 is drawn a wire and is made
It is the signal output part of ultrasonic signal pre-amplification circuit；
Ultrasonic signal bandwidth-limited circuit is：The signal input part of ultrasonic signal bandwidth-limited circuit and output end according to
Secondary series connection accesses electric capacity C32, inductance L3；In electric capacity C32With inductance L3Between select a node, between the node and earth terminal access electricity
Resistance R34；In inductance L3A node is selected and output end between, resistance R is accessed between the node and earth terminal35；
Ultrasonic signal logarithmic amplifying circuit is：Ultrasonic signal logarithmic amplifying circuit input and logafier
Access resistance R is sequentially connected in series between the INHI pins of AD831036, electric capacity C33；In resistance R36With electric capacity C33Between select a node,
Electric capacity C is accessed between the node and earth terminal34；Electricity is accessed between the INHI pins and INLO pins of logafier AD8310
Resistance R38；Electric capacity C is accessed between the INLO pins and earth terminal of logafier AD831038；The COMM of logafier AD8310
Pin is grounded；Electric capacity C is accessed between the BFIN pins and earth terminal of logafier AD831036；Between+5V voltages and earth terminal
It is sequentially connected in series access resistance R37, electric capacity C35；Resistance R37With electric capacity C35Between select a node to connect logafier AD8310 simultaneously
ENBL pins, Vpos pins；Electric capacity C is accessed between the OFLT pins and earth terminal of logafier AD831037；Logarithmic amplification
The Vout pins and signal output part of device AD8310 are sequentially connected in series access resistance R39, electric capacity C40；In resistance R39With electric capacity C40Between
A node is selected, electric capacity C is accessed between the node and earth terminal39；In electric capacity C40A node is selected and signal output part between, the knot
Point accesses resistance R with earth terminal40；
Ultrasonic signal peak-detector circuit is：The pin 3 of first voltage feedback dual amplifier AD8058 is defeated as signal
Enter end；Resistance R is accessed between the pin 8 and+5V voltages of first voltage feedback dual amplifier AD805841；In first voltage feedback
The pin 8 and resistance R of dual amplifier AD805841Between select a node, electric capacity C is accessed between the node and earth terminal41；First
Resistance R is accessed between the pin 4 and -5V voltages of Voltage Feedback dual amplifier AD805843；First voltage feeds back dual amplifier
Electric capacity C is accessed between the pin 4 and earth terminal of AD805842；The pin 2 of first voltage feedback dual amplifier AD8058 connects electricity respectively
Resistance R42One end, diode D6Negative pole, resistance R42Another termination -5V voltages, diode D6Positive pole to connect first voltage anti-
The pin 1 of feedback dual amplifier AD8058；The pin 1 of first voltage feedback dual amplifier AD8058 meets diode D5Positive pole, two
Pole pipe D5Negative pole connect the pin 5 of second voltage feedback dual amplifier AD8058；Resistance R44It is connected in parallel on diode D5Two ends；
Diode D5Negative pole and the pin 5 of second voltage feedback dual amplifier AD8058 between select a node, the node and earth terminal
Between in parallel access electric capacity C43With resistance R46, and resistance R is accessed between the node and -5V voltages45；Second voltage feedback is double
The pin 4 and pin 8 of amplifier AD8058 are in high-impedance state；The pin 6 of second voltage feedback dual amplifier AD8058 is taken over
Pin 7；The extraction wire of pin 7 of second voltage feedback dual amplifier AD8058, as the letter of ultrasonic signal peak-detector circuit
Number output end.
To solve the above problems, the present invention provides a kind of variable connector cabinet acoustoelectric signal acquisition method, comprises the following steps：
Step S1：Sensor assembly receives part in partial discharge of switchgear signal, i.e. TEV sensors search switch cabinet
Transient earth voltage signal；Local ultrasonic signal in ultrasonic sensor search switch cabinet；
Step S2：Pair signals conditioning module receives the signal detected from sensor assembly, i.e.,：
TEV signal conditioning circuits module receives the transient earth voltage signal detected from TEV sensors, and does following place
Reason：
Step S21：TEV signaling multilevels filter circuit is filtered treatment to the signal for receiving, filter 3-100MHz with
Outer signal, and the signal after treatment is transmitted to TEV signal logarithmic amplifying circuits；
Step S22：TEV signals logarithmic amplifying circuit carries out non-linear amplification to transient earth voltage signal, and by after amplification
Signal be transmitted to TEV signal peak detecting circuits；
Step S23：The local discharge signal that TEV signal peaks detecting circuit is as short as ps grades to the duration is processed,
The amplitude signal mostly important to Partial Discharge Detection is extracted, the signal after treatment is transmitted to master control collection point after being changed through A/D
Analysis circuit module；
Ultrasonic signal conditioning circuit module receives the ultrasonic signal detected from ultrasonic sensor, and does as follows
Treatment：
Step S21 '：Be amplified for the small-signal that ultrasonic sensor is exported by ultrasonic signal pre-amplification circuit,
And the signal after treatment is reached into ultrasonic signal bandwidth-limited circuit；
Step S22 '：Ultrasonic signal bandwidth-limited circuit suppresses spuious to the input further frequency-selecting of ultrasonic signal
Background audio signals are disturbed, and the signal after treatment is reached into ultrasonic signal logarithmic amplifying circuit；
Step S23 '：Ultrasonic signal logarithmic amplifying circuit carries out non-linear amplification to ultrasonic signal, and by after amplification
Signal reach ultrasonic signal peak-detector circuit；
Step S24 '：Ultrasonic signal peak-detector circuit is as short as at ps grades of local discharge signal to the duration
Reason, extracts the amplitude signal mostly important to Partial Discharge Detection, and the signal after treatment is transmitted to master control after being changed through A/D and gathered
Analysis circuit module；
Step S3：It is special that master control collection analysis circuit module extracts shelf depreciation to transient earth voltage signal and ultrasonic signal
Levy data, and after Monitoring Data is uploaded with Modbus agreements eventually through the RS485 interfaces that mainboard is drawn supports the agreement
Platform；
Step S4：Backstage carries out the displaying such as electric discharge amplitude, historical data curve.
The variable connector cabinet acoustoelectric signal harvester and method provided using the present invention, are applied to detection multichannel and opened
The local discharge signal of cabinet is closed, pair signals conditioning module and master control collection analysis circuit module that this programme is used are passed to TEV
The acoustoelectric signal that sensor and ultrasonic sensor are detected is processed, and upload the data to correlation according to Modbus stipulations
The monitoring backstage of support, entering to be about to Monitoring Data by backstage carries out electric discharge amplitude, the displaying of historical data curve, enters for operating personnel
Line number is it is investigated that see；Additionally, the present apparatus can realize that LCD screen shows on the spot by the extended mode of master control collection analysis circuit module,
Data are checked at realization scene；Based on above procedure, the variable connector cabinet acoustoelectric signal harvester that the present invention is provided solves mesh
Preceding switching devices discharge examination is inconvenient, workload is big, Monitoring Data cannot realize the long-range problem checked；And form a set of
Complete comprehensive on-line monitoring apparatus, have the advantages that low cost, simple to operate, the integrated, high degree of automation of monitoring；In this dress
In putting, the factors such as switch cabinet structure is compact are fully taken into account, the present apparatus design generally individual substrate and each module assembled form chi
Very little compact variable connector cabinet acoustoelectric signal harvester；The present apparatus may be selected to be installed in the instrument cabin room of switch cubicle, pass through
Used cooperatively with TEV sensors installed in different cabins, ultrasonic sensor, it is possible to achieve a large amount of switch cubicles are locally put
The monitoring of electricity；
Variable connector cabinet acoustoelectric signal harvester and method are described further below in conjunction with the accompanying drawings.
Brief description of the drawings
Fig. 1 is the schematic diagram of variable connector cabinet acoustoelectric signal harvester of the invention；
Fig. 2 is the structure connection top view of pair signals conditioning module and master control collection analysis circuit module in the present invention；
Fig. 3 is the left view of the structure of pair signals conditioning module in the present invention；
Fig. 4 is the circuit diagram of TEV signal conditioning circuit modules in the present invention；
Fig. 5 is the circuit diagram of ultrasonic signal conditioning circuit module in the present invention
Specific embodiment
As shown in figure 1, the present embodiment includes paired sensor assembly 1, pair signals conditioning module 2, master control collection analysis
Circuit module 3, power supply unit 4, backstage 5；The present embodiment uses three sensor assemblies, 1, three pair signals conditioning modules 2,
The work corresponding with pair signals conditioning module 2 of one sensor assembly 1；Sensor assembly 1 puts the part in switch cubicle
Electric signal delivers to pair signals conditioning module 2, and the signal that pair signals conditioning module 2 will be received is filtered, amplifies, peak value
A/D conversions are carried out after detection process, the signal after conversion is sent to master control collection analysis circuit module 3, by master control collection analysis electricity
Road module 3 carries out data operation treatment, extracts local discharge characteristic data, and Monitoring Data is uploaded into backstage 5, while master control
Collection analysis circuit module 3 realizes that LCD screen shows on the spot by way of extension；
As shown in Fig. 2 with reference to Fig. 3, the present embodiment also includes first substrate 6 and second substrate 7, pair signals conditioning module
2 are arranged on first substrate 6；Master control collection analysis circuit module 3 and power supply unit 4 are each attached on second substrate 7；Sensing
Device module 1 is embedded in (not shown) in switch cubicle；The signal output part of pair signals conditioning module 2 is adopted through winding displacement with master control
The signal input part connection of set analysis circuit module 3；Pair signals conditioning module 2, master control collection analysis circuit module 3 are by powering
Unit 4 is powered.
The following is the detailed description to each module：
Sensor assembly 1 is made up of TEV sensors 11 and ultrasonic sensor 12；The present embodiment uses three sensor dies
Block 1 (in other actual conditions, can be according to specific needs using multiple to Signal-regulated kinase 2)；Three sensor assemblies 1,
Be embedded in switch cabinet bus cabin, breaker cabin respectively, in cable tank room, for receiving partial discharge of switchgear signal.
Pair signals conditioning module 2 is by TEV signal conditioning circuits module 21, ultrasonic signal conditioning circuit module 22, two
Individual AD conversion module 23 is constituted；Three pair signals conditioning modules 2 are fixed on first substrate 6 side by side through the first contact pin connector 26
On；TEV signal conditioning circuits module 21 and ultrasonic signal conditioning circuit module 22 cover with radome 24, reduce noise
And electromagnetic interference；The signal input part of TEV signal conditioning circuits module 21 and ultrasonic signal conditioning circuit module 22 is connected to
Bnc interface 25；
Detectable signal is transmitted to TEV signal conditioning circuits module 21 by TEV sensors 11 through bnc interface 25；TEV signal conditions
Circuit module 21 output termination be connected with the signal input part of an AD conversion 23, the signal output part of the AD conversion 23 and
FPC 27 electrical connection；After being processed through TEV signal conditioning circuits module 21 by the signal of the feed-in of TEV sensors 11, carry out AD and turn
Change, the signal after conversion is sent to master control collection analysis circuit module 3 through FPC 27；
Detectable signal is transmitted to ultrasonic signal conditioning circuit module 22 by ultrasonic sensor 12 through bnc interface 25；Ultrasound
The output termination of ripple signal conditioning circuit module 22 is connected with the signal input part of another AD conversion 23, the letter of the AD conversion 23
Number output end is electrically connected with FPC 27；By the signal of the feed-in of ultrasonic sensor 12 through ultrasonic signal conditioning circuit module 22
After treatment, it is AD converted, the signal after conversion is sent to master control collection analysis circuit module 3 through FPC 27.
Master control collection analysis circuit module 3 includes mainboard 31, expansion interface 32,485 interfaces 33 and minimum system plate 34；It is main
Plate 31 is arranged on second substrate 7；
The interface 33 of expansion interface 32 and 485 is drawn by mainboard 31；Minimum system plate 34 is arranged on mainboard 31, and through contact pin
Connector is connected with mainboard 31；Whole master control collection analysis circuit module 3 is using the module discrete with extension of minimum system plate 34
Change design；The signal input part of minimum system plate 34 is through respective FPC 27 company of winding displacement and three pair signals conditioning modules 2
Connect；Minimum system plate 34 receives the switch cubicle discharge signal after being processed from three pair signals conditioning modules 2, for transient state ground
Voltage signal and the local discharge information extracting method of ultrasonic signal feature design extract local discharge characteristic data, and finally lead to
Cross the RS485 interfaces 33 of the extraction of mainboard 31 and Monitoring Data upload is supported that the backstage 5 of the agreement is discharged with Modbus agreements
The displaying such as amplitude, historical data curve, remotely data are checked to facilitate；At the same time, LCD screen is realized also by expansion interface 32
Show on the spot；
Power supply unit 4 is arranged on second substrate 7；The excitation output end of power supply unit 4 draws the second contact pin connector 43,
Second contact pin connector 43 is connected through solder joint 42 with the excitation input lead of master control collection analysis circuit module 3；Power supply unit 4
Power input draw another group of the second contact pin connector 43, this group of contact pin connector is through another group of solder joint 42 and power interface
41 connections；Radome is increased to power supply unit 4 using totally-enclosed encapsulation technology, it is ensured that the reduction system of power supply unit 4 receives extraneous ring
The interference in border.
Retouched the following is the circuit layout to TEV signal conditioning circuits module 21 and ultrasonic signal conditioning circuit module 22
State：
As shown in figure 4, TEV signal conditioning circuits module 21 includes TEV signaling multilevels filter circuit 211, TEV signal logarithms
Amplifying circuit 212, TEV signal peaks detecting circuit 213；Wherein, the output termination TEV letters of TEV signaling multilevels filter circuit 211
The input of number logarithmic amplifying circuit 212；The output termination TEV signal peak detecting circuits of TEV signals logarithmic amplifying circuit 212
Input 213；The following is to TEV signaling multilevels filter circuit 211, the and of TEV signals logarithmic amplifying circuit 212 in the present embodiment
The description of the function, Butut of TEV signal peaks detecting circuit 213：
TEV signaling multilevels filter circuit 211 is used to process the analog signal of TEV sensor feed-ins, limits its band
Width, to reduce the electromagnetic interference of external environment condition to greatest extent and improve the sensitivity of Partial Discharge Detection, filters 3-100MHz
Signal in addition；TEV signaling multilevels filter circuit 211 is：The input of TEV signaling multilevels filter circuit 211 to output end it
Between be sequentially connected in series access electric capacity C5, resistance R8, inductance L1With inductance L2；In the input of TEV signaling multilevels filter circuit 211 and electricity
Hold C5Between select a node, the node respectively with diode D1Positive pole, diode D2Negative pole connection；Diode D1Negative pole
Resistance R is accessed and+5V voltages between1；Diode D1With resistance R1Between select a node, between the node and earth terminal access
Resistance R3, resistance R2With electric capacity C2With resistance R after series connection3It is in parallel；Resistance R1A node is selected and+5V voltages between, the node with connect
Electric capacity C is accessed between ground terminal1；Diode D2Positive pole and -5V voltages between access resistance R4；Diode D2With resistance R4Between select
One node, accesses resistance R between the node and earth terminal6, resistance R5With electric capacity C4With resistance R after series connection6It is in parallel；Resistance R4
A node is selected and -5V voltages between, electric capacity C is accessed between the node and earth terminal3；In electric capacity C5With resistance R8Between select a knot
Point, accesses resistance R between the node and earth terminal7；In resistance R8With inductance L1Between select a node, the node and earth terminal it
Between in parallel access resistance R9, electric capacity C6, electric capacity C7；In inductance L1With inductance L2Between select a node, between the node and earth terminal
Parallel connection accesses electric capacity C8, electric capacity C9；In inductance L2A node is selected and the output end of TEV signaling multilevels filter circuit 211 between, should
It is in parallel between node and earth terminal to access electric capacity C10, electric capacity C11, resistance R10；
TEV signals logarithmic amplifying circuit 212 is used to carry out non-linear amplification to transient earth voltage signal, simultaneously for big letter
Number there is the gain of very little again, the electric peace that volitional check signal amplitude ensures device loop is capable of for violent electric discharge phenomena
Entirely；TEV signals logarithmic amplifying circuit 212 is：The input of TEV signals logarithmic amplifying circuit 212 and logafier AD8310's
Electric capacity C is accessed between INHI pins12, electric capacity C12A node is selected between INHI pins, is accessed between the node and earth terminal
Resistance R11；Electric capacity C is accessed between the INLO pins and earth terminal of logafier AD831015；Logafier AD8310's
Resistance R is accessed between INHI pins and INLO pins13；The COMM pins ground connection of logafier AD8310；Logafier
Electric capacity C is accessed between the BFIN pins and earth terminal of AD831014；Access resistance is sequentially connected in series between+5V voltages and earth terminal
R12, electric capacity C13；Resistance R12With electric capacity C13Between select a node to connect ENBL pins, the Vpos of logafier AD8310 simultaneously
Pin；Electric capacity C is accessed between the OFLT pins and earth terminal of logafier AD831016；The Vout of logafier AD8310
Pin extraction wire as TEV signals logarithmic amplifying circuit 212 signal output part；
TEV signal peaks detecting circuit 213 is mainly used in being as short as at ps grades of local discharge signal the duration
Reason, extract the amplitude signal mostly important to Partial Discharge Detection, therefore the sample rate of TEV signal peaks detecting circuit 213 sets
Surely it is not less than 1MHz；TEV signal peaks detecting circuit 213 is：The pin 3 of operational amplifier A D8066 is used as signal input part；
Resistance R is accessed between the pin 8 and+5V voltages of operational amplifier A D806614；In the pin 8 and electricity of operational amplifier A D8066
Resistance R14Between select a node, electric capacity C is accessed between the node and earth terminal17；The pin 4 of operational amplifier A D8066 and -5V electricity
Resistance R is accessed between pressure16；Electric capacity C is accessed between the pin 4 and earth terminal of operational amplifier A D806618；Operational amplifier
The difference connecting resistance of pin 2 R of AD806615One end, diode D3Negative pole, resistance R15Another termination -5V voltages, diode
D3Positive pole connect the pin 1 of operational amplifier A D8066；The pin 1 of operational amplifier A D8066 meets diode D4Positive pole, two poles
Pipe D4Negative pole connect the pin 5 of operational amplifier A D8056；In diode D4Negative pole and operational amplifier A D8056 pin 5
Between select a node, electric capacity C is accessed between the node and earth terminal19, resistance R is accessed between the node and -5V17；Operation amplifier
The pin 4 and pin 8 of device AD8056 are in high-impedance state；The adapter pin 7 of pin 6 of operational amplifier A D8056；Operational amplifier
The extraction wire of pin 7 of AD8056, as the signal output part of TEV signal peaks detecting circuit 213.
As shown in figure 5, ultrasonic signal conditioning circuit module 22 includes ultrasonic signal pre-amplification circuit 221, ultrasound
Ripple signal bandwidth-limited circuit 222, ultrasonic signal logarithmic amplification electricity 223, ultrasonic signal peak-detector circuit 224；Wherein
The input of the output termination ultrasonic signal of ultrasonic signal pre-amplification circuit 221 bandwidth-limited circuit 222；Ultrasonic signal band
The input of the output termination ultrasonic signal of bandpass filter circuit 222 logarithmic amplifying circuit 223；Ultrasonic signal logarithmic amplifying circuit
The input of 223 output termination ultrasonic signal peak-detector circuit 224；The following is to being put before ultrasonic signal in the present embodiment
Big circuit 221, ultrasonic signal bandwidth-limited circuit 222, the inspection of ultrasonic signal logarithmic amplification electricity 223, ultrasonic signal peak value
The description of the function, Butut of wave circuit 224：
Ultrasonic signal pre-amplification circuit 221 is responsible for being amplified the small-signal that ultrasonic sensor 12 is exported,
To improve the antijamming capability of signal；Ultrasonic signal pre-amplification circuit 221 is：Ultrasonic signal pre-amplification circuit 221
Signal input part and the pin 3 of first instrument amplifier INA128 between access electric capacity C21；First instrument amplifier INA128
Pin 2 and earth point between be sequentially connected in series access electric capacity C20、R18；The pin 2 and pin 3 of first instrument amplifier INA128
Between be sequentially connected in series access resistance R19, resistance R20；In resistance R19With resistance R20Between select a node be grounded；First instrument amplifies
Resistance R is accessed between the pin 1 and pin 8 of device INA12821；Access resistance R is sequentially connected in series between+5V voltages and earth terminal22、
Electric capacity C22；In resistance R22With electric capacity C22Between select a node to be connected with the pin 7 of first instrument amplifier INA128；- 5V voltages
Access resistance R is sequentially connected in series and earth terminal between23, electric capacity C23；Resistance R23With electric capacity C23Between select a node and first instrument to put
The pin 4 of big device INA128 is connected；The pin 6 of first instrument amplifier INA128 and the pin of second instrument amplifier INA128
Electric capacity C is accessed between 324；In the pin 3 and electric capacity C of second instrument amplifier INA12824Between select a node, the node and connect
Resistance R is accessed between ground terminal24；The pin 2 of second instrument amplifier INA128 successively with the pipe of first instrument amplifier INA128
Pin 7, the pin 5 of first instrument amplifier INA128, the pin 5 of second instrument amplifier INA128 are grounded after connecting；Second instrument
Resistance R is accessed between the pin 1 and pin 8 of table amplifier INA12826；Access electricity is sequentially connected in series between+5V voltages and earth terminal
Resistance R25, electric capacity C25；In resistance R25With electric capacity C25Between select a node to be connected with the pin 7 of second instrument amplifier INA128；-
Access resistance R is sequentially connected in series between 5V voltages and earth terminal27, electric capacity C26；Resistance R27With electric capacity C26Between select a node and second
The pin 4 of instrument amplifier INA128 is connected；The pin 6 and Voltage Feedback dual amplifier of second instrument amplifier INA128
Access electric capacity C is sequentially connected in series between the pin 2 of AD805827, resistance R28, electric capacity C30；In resistance R28With electric capacity C30Between select one
Node, accesses resistance R between the node and earth terminal29, while the pin 2 of the node and Voltage Feedback dual amplifier AD8058 it
Between be sequentially connected in series access electric capacity C29, resistance R31；Electric capacity C29With resistance R31Between select a node, the node and Voltage Feedback are double to be put
The pin 1 of big device AD8058 connects；Resistance R is accessed between the pin 3 and earth terminal of Voltage Feedback dual amplifier AD805830；+ 5V electricity
Access resistance R is sequentially connected in series between pressure and earth terminal32, electric capacity C31；In resistance R32With electric capacity C31Between select a node anti-with voltage
The pin 8 of feedback dual amplifier AD8058 is connected；Access resistance R is sequentially connected in series between -5V voltages and earth terminal33, electric capacity C28；
Resistance R33With electric capacity C28Between select a node to be connected with the pin 4 of Voltage Feedback dual amplifier AD8058；Voltage Feedback is double to be amplified
The pin 1 of device AD8058 draws signal output part of the wire as ultrasonic signal pre-amplification circuit 221；
Ultrasonic signal bandwidth-limited circuit 222 is responsible for the input further frequency-selecting of ultrasonic signal, to suppress spuious
Background audio signals are disturbed；Output after bandpass filter frequency-selecting is used for logarithmic amplification, detection and analog-to-digital conversion；For switch cubicle
For, ultrasonic signal produced by shelf depreciation is usually no more than 100kHz, therefore is designed as 20k's to 100k during bandpass filtering
Bandwidth；Ultrasonic signal bandwidth-limited circuit 222 is：The signal input part of ultrasonic signal bandwidth-limited circuit 222 and output
End is sequentially connected in series access electric capacity C32, inductance L3；In electric capacity C32With inductance L3Between select a node, the node and earth terminal it is indirectly
Enter resistance R34；In inductance L3A node is selected and output end between, resistance R is accessed between the node and earth terminal35；
Ultrasonic signal logarithmic amplifying circuit 223 is used to carry out non-linear amplification to ultrasonic signal, simultaneously for big letter
Number there is the gain of very little again, the electric peace that volitional check signal amplitude ensures device loop is capable of for violent electric discharge phenomena
Entirely；It is sequentially connected in series between the input of ultrasonic signal logarithmic amplifying circuit 223 and the INHI pins of logafier AD8310 and is connect
Enter resistance R36, electric capacity C33；In resistance R36With electric capacity C33Between select a node, access electric capacity between the node and earth terminal
C34；Resistance R is accessed between the INHI pins and INLO pins of logafier AD831038；The INLO of logafier AD8310
Electric capacity C is accessed between pin and earth terminal38；The COMM pins ground connection of logafier AD8310；Logafier AD8310's
Electric capacity C is accessed between BFIN pins and earth terminal36；Access resistance R is sequentially connected in series between+5V voltages and earth terminal37, electric capacity C35；
Resistance R37With electric capacity C35Between select a node to connect ENBL pins, the Vpos pins of logafier AD8310 simultaneously；Logarithm is put
Electric capacity C is accessed between the OFLT pins and earth terminal of big device AD831037；The Vout pins and signal of logafier AD8310 are defeated
Go out end and be sequentially connected in series access resistance R39, electric capacity C40；In resistance R39With electric capacity C40Between select a node, the node and earth terminal it
Between access electric capacity C39；In electric capacity C40A node is selected and signal output part between, the node accesses resistance R with earth terminal40；
The local discharge signal that ultrasonic signal peak-detector circuit 224 is mainly used in being as short as the duration ps grades is carried out
Treatment, extracts the amplitude signal mostly important to Partial Discharge Detection, therefore the setting of peak-detector circuit sample rate is not less than
1MHz；Ultrasonic signal peak-detector circuit 224 is：The pin 3 of first voltage feedback dual amplifier AD8058 is defeated as signal
Enter end；Resistance R is accessed between the pin 8 and+5V voltages of first voltage feedback dual amplifier AD805841；In first voltage feedback
The pin 8 and resistance R of dual amplifier AD805841Between select a node, electric capacity C is accessed between the node and earth terminal41；First
Resistance R is accessed between the pin 4 and -5V voltages of Voltage Feedback dual amplifier AD805843；First voltage feeds back dual amplifier
Electric capacity C is accessed between the pin 4 and earth terminal of AD805842；The pin 2 of first voltage feedback dual amplifier AD8058 connects electricity respectively
Resistance R42One end, diode D6Negative pole, resistance R42Another termination -5V voltages, diode D36Positive pole to connect first voltage anti-
The pin 1 of feedback dual amplifier AD8058；The pin 1 of first voltage feedback dual amplifier AD8058 meets diode D5Positive pole, two
Pole pipe D5Negative pole connect the pin 5 of second voltage feedback dual amplifier AD8058；Resistance R44It is connected in parallel on diode D5Two ends；
Diode D5Negative pole and the pin 5 of second voltage feedback dual amplifier AD8058 between select a node, the node and earth terminal
Between in parallel access electric capacity C43With resistance R46, and resistance R is accessed between the node and -5V voltages45；Second voltage feedback is double
The pin 4 and pin 8 of amplifier AD8058 are in high-impedance state；The pin 6 of second voltage feedback dual amplifier AD8058 is taken over
Pin 7；The extraction wire of pin 7 of second voltage feedback dual amplifier AD8058, as ultrasonic signal peak-detector circuit 224
Signal output part.
The course of work of the present embodiment is comprised the following steps：
Step S1：Sensor assembly 1 receives office in partial discharge of switchgear signal, i.e. the search switch cabinet of TEV sensors 11
The transient earth voltage signal in portion；Local ultrasonic signal in the search switch cabinet of ultrasonic sensor 12；
Step S2：Pair signals conditioning module 2 receives the signal detected from sensor assembly 1, i.e.,：
TEV signal conditioning circuits module 21 receives the transient earth voltage signal detected from TEV sensors 11, and do as
Lower treatment：
Step S21：211 pairs of signals for receiving of TEV signaling multilevels filter circuit are filtered treatment, filter 3-100MHz
Signal in addition, and the signal after treatment is transmitted to TEV signals logarithmic amplifying circuit 212；
Step S22：TEV signals logarithmic amplifying circuit 212 carries out non-linear amplification to transient earth voltage signal, and will amplify
Signal afterwards is transmitted to TEV signal peaks detecting circuit 213；
Step S23：TEV signal peaks detecting circuit 213 is as short as at ps grades of local discharge signal to the duration
Reason, extracts the amplitude signal mostly important to Partial Discharge Detection, and the signal after treatment is transmitted to master control after being changed through A/D and gathered
Analysis circuit module 3；
Ultrasonic signal conditioning circuit module 22 receives the ultrasonic signal detected from ultrasonic sensor 12, and does
Following treatment：
Step S21 '：The small-signal that ultrasonic signal pre-amplification circuit 221 exports ultrasonic sensor 12 is carried out
Amplify, and the signal after treatment is reached into ultrasonic signal bandwidth-limited circuit 222；
Step S22 '：The 222 pairs of input further frequency-selectings of ultrasonic signal of ultrasonic signal bandwidth-limited circuit, suppress spuious
Background audio signals interference, and the signal after treatment is reached into ultrasonic signal logarithmic amplifying circuit 223；
Step S23 '：Ultrasonic signal logarithmic amplifying circuit 223 carries out non-linear amplification to ultrasonic signal, and will amplify
Signal afterwards reaches ultrasonic signal peak-detector circuit 224；
Step S24 '：The local discharge signal that ultrasonic signal peak-detector circuit 224 is as short as ps grades to the duration enters
Row treatment, extracts the amplitude signal mostly important to Partial Discharge Detection, and the signal after treatment is transmitted to master control after being changed through A/D
Collection analysis circuit module 3；
Step S3：Master control collection analysis circuit module 3 extracts shelf depreciation to transient earth voltage signal and ultrasonic signal
Characteristic, and Monitoring Data is uploaded by the support association with Modbus agreements eventually through the RS485 interfaces 33 that mainboard 31 is drawn
The backstage 5 of view；
Step S4：Backstage 5 carries out the displaying such as electric discharge amplitude, historical data curve.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to model of the invention
Enclose and be defined, on the premise of design spirit of the present invention is not departed from, those of ordinary skill in the art are to technical side of the invention
Various modifications and improvement that case is made, all should fall into the protection domain of claims of the present invention determination.
Claims (8)
1. a kind of variable connector cabinet acoustoelectric signal harvester, including sensor assembly (1), master control collection analysis circuit module
(3), power supply unit (4), backstage (5)；Sensor assembly (1) is made up of TEV sensors (11) and ultrasonic sensor (12)；Pass
Sensor module (1) is embedded in switch cubicle；Power supply unit (4) is for providing power supply；Backstage (5) is for Monitoring Data to be put
Electric amplitude, the displaying of historical data curve；Characterized in that,
Also include pair signals conditioning module (2)；Pair signals conditioning module (2) is by TEV signal conditioning circuits module (21), super
Acoustic signals conditioning circuit module (22), two AD conversion module (23) compositions；The signal output part of TEV sensors (11) with
TEV signal conditioning circuits module (21) signal input part is electrically connected, TEV signal conditioning circuits module (21) signal output part and
Individual AD conversion module (23) signal input part electrical connection；The signal output part of ultrasonic sensor (12) is nursed one's health with ultrasonic signal
The signal input part electrical connection of circuit module (22), ultrasonic signal conditioning circuit module (22) signal output part and another AD
Modular converter (23) signal input part is electrically connected；Two AD conversion modules (23) with master control collection analysis circuit module (3)
Signal input part is electrically connected；The communication interface of master control collection analysis circuit module (3) is connected with backstage (5)；
The ultrasonic signal conditioning circuit module (22) includes ultrasonic signal pre-amplification circuit (221), ultrasonic signal
Bandwidth-limited circuit (222), ultrasonic signal logarithmic amplifying circuit (223), ultrasonic signal peak-detector circuit (224)；Its
Middle ultrasonic signal pre-amplification circuit (221) is responsible for being put the small-signal that ultrasonic sensor (12) is exported
Greatly, the antijamming capability of signal is improved；The a width of 20kHz to 100kHz of band of ultrasonic signal bandwidth-limited circuit (222)；Ultrasound
Ripple signal bandwidth-limited circuit (222) is responsible for, to the input further frequency-selecting of ultrasonic signal, believing with the background audio for suppressing spuious
Number interference；Output after bandpass filter frequency-selecting is used for logarithmic amplification, detection and analog-to-digital conversion；Ultrasonic signal logarithmic amplification electricity
For carrying out non-linear amplification to ultrasonic signal, the signal to violent electric discharge phenomena carries out volitional check amplitude on road (223)；
Ultrasonic signal peak-detector circuit (224) is processed for being as short as ps grades of local discharge signal to the duration, is extracted
The amplitude signal mostly important to Partial Discharge Detection；The setting of ultrasonic signal peak-detector circuit (224) sample rate is not low
In 1MHz；
The ultrasonic signal pre-amplification circuit (221) is：The signal input part of ultrasonic signal pre-amplification circuit (221)
Electric capacity C is accessed and the pin 3 of first instrument amplifier INA128 between21；The pin 2 of first instrument amplifier INA128 and ground connection
Access electric capacity C is sequentially connected in series between point20、R18；It is sequentially connected in series between the pin 2 and pin 3 of first instrument amplifier INA128 and is connect
Enter resistance R19, resistance R20；In resistance R19With resistance R20Between select a node be grounded；The pin 1 of first instrument amplifier INA128
Resistance R is accessed and pin 8 between21；Access resistance R is sequentially connected in series between+5V voltages and earth terminal22, electric capacity C22；In resistance R22
With electric capacity C22Between select a node to be connected with the pin 7 of first instrument amplifier INA128；Between -5V voltages and earth terminal successively
Series connection accesses resistance R23, electric capacity C23；Resistance R23With electric capacity C23Between select the pin of a node and first instrument amplifier INA128
4 connections；Electric capacity C is accessed between the pin 6 of first instrument amplifier INA128 and the pin 3 of second instrument amplifier INA12824；
In the pin 3 and electric capacity C of second instrument amplifier INA12824Between select a node, access resistance between the node and earth terminal
R24；The pin 2 of second instrument amplifier INA128 amplifies with the pin 7, first instrument of first instrument amplifier INA128 successively
The pin 5 of device INA128, the pin 5 of second instrument amplifier INA128 are grounded after connecting；Second instrument amplifier INA128's
Resistance R is accessed between pin 1 and pin 826；Access resistance R is sequentially connected in series between+5V voltages and earth terminal25, electric capacity C25；In electricity
Resistance R25With electric capacity C25Between select a node to be connected with the pin 7 of second instrument amplifier INA128；- 5V voltages and earth terminal it
Between be sequentially connected in series access resistance R27, electric capacity C26；Resistance R27With electric capacity C26Between select a node and second instrument amplifier INA128
Pin 4 connect；Between the pin 6 of second instrument amplifier INA128 and the pin 2 of Voltage Feedback dual amplifier AD8058 according to
Secondary series connection accesses electric capacity C27, resistance R28, electric capacity C30；In resistance R28With electric capacity C30Between select a node, the node and earth terminal
Between access resistance R29, while being sequentially connected in series access electric capacity between the pin 2 of the node and Voltage Feedback dual amplifier AD8058
C29, resistance R31；Electric capacity C29With resistance R31Between select a node, the node connects with the pin 1 of Voltage Feedback dual amplifier AD8058
Connect；Resistance R is accessed between the pin 3 and earth terminal of Voltage Feedback dual amplifier AD805830；Between+5V voltages and earth terminal according to
Secondary series connection accesses resistance R32, electric capacity C31；In resistance R32With electric capacity C31Between select a node and Voltage Feedback dual amplifier AD8058
Pin 8 connect；Access resistance R is sequentially connected in series between -5V voltages and earth terminal33, electric capacity C28；In resistance R33With electric capacity C28It
Between select a node to be connected with the pin 4 of Voltage Feedback dual amplifier AD8058；The pin 1 of Voltage Feedback dual amplifier AD8058 draws
Go out signal output part of the wire as ultrasonic signal pre-amplification circuit (221)；
Ultrasonic signal bandwidth-limited circuit (222) is：The signal input part of ultrasonic signal bandwidth-limited circuit (222) with it is defeated
Go out end and be sequentially connected in series access electric capacity C32, inductance L3；In electric capacity C32With inductance L3Between select a node, between the node and earth terminal
Access resistance R34；In inductance L3A node is selected and output end between, resistance R is accessed between the node and earth terminal35；
Ultrasonic signal logarithmic amplifying circuit (223) is：Ultrasonic signal logarithmic amplifying circuit (223) input and logarithmic amplification
Access resistance R is sequentially connected in series between the INHI pins of device AD831036, electric capacity C33；In resistance R36With electric capacity C33Between select a knot
Point, accesses electric capacity C between the node and earth terminal34；The INHI pins and INLO pins of logafier AD8310 are indirectly
Enter resistance R38；Electric capacity C is accessed between the INLO pins and earth terminal of logafier AD831038；Logafier AD8310's
COMM pins are grounded；Electric capacity C is accessed between the BFIN pins and earth terminal of logafier AD831036；+ 5V voltages and earth terminal
Between be sequentially connected in series access resistance R37, electric capacity C35；Resistance R37With electric capacity C35Between select a node while connecting logafier
The ENBL pins of AD8310, Vpos pins；Electric capacity C is accessed between the OFLT pins and earth terminal of logafier AD831037；It is right
The Vout pins and signal output part of number amplifier AD8310 are sequentially connected in series access resistance R39, electric capacity C40；In resistance R39And electric capacity
C40Between select a node, electric capacity C is accessed between the node and earth terminal39；In electric capacity C40A knot is selected and signal output part between
Point, the node accesses resistance R with earth terminal40；
Ultrasonic signal peak-detector circuit (224) is：The pin 3 of first voltage feedback dual amplifier AD8058 is defeated as signal
Enter end；Resistance R is accessed between the pin 8 and+5V voltages of first voltage feedback dual amplifier AD805841；In first voltage feedback
The pin 8 and resistance R of dual amplifier AD805841Between select a node, electric capacity C is accessed between the node and earth terminal41；First
Resistance R is accessed between the pin 4 and -5V voltages of Voltage Feedback dual amplifier AD805843；First voltage feeds back dual amplifier
Electric capacity C is accessed between the pin 4 and earth terminal of AD805842；The pin 2 of first voltage feedback dual amplifier AD8058 connects electricity respectively
Resistance R42One end, diode D6Negative pole, resistance R42Another termination -5V voltages, diode D6Positive pole to connect first voltage anti-
The pin 1 of feedback dual amplifier AD8058；The pin 1 of first voltage feedback dual amplifier AD8058 meets diode D5Positive pole, two
Pole pipe D5Negative pole connect the pin 5 of second voltage feedback dual amplifier AD8058；Resistance R44It is connected in parallel on diode D5Two ends；
Diode D5Negative pole and the pin 5 of second voltage feedback dual amplifier AD8058 between select a node, the node and earth terminal
Between in parallel access electric capacity C43With resistance R46, and resistance R is accessed between the node and -5V voltages45；Second voltage feedback is double
The pin 4 and pin 8 of amplifier AD8058 are in high-impedance state；The pin 6 of second voltage feedback dual amplifier AD8058 is taken over
Pin 7；The extraction wire of pin 7 of second voltage feedback dual amplifier AD8058, as ultrasonic signal peak-detector circuit (224)
Signal output part.
2. variable connector cabinet acoustoelectric signal harvester according to claim 1, it is characterised in that the TEV signals are adjusted
Reason circuit module (21) includes TEV signaling multilevels filter circuit (211), TEV signals logarithmic amplifying circuit (212), TEV signal peaks
Value detecting circuit (213)；Wherein, TEV signaling multilevels filter circuit (211) is for filtering the signal beyond 3-100MHz；TEV believes
Number multistage filter circuit (211) is processed the analog signal of TEV sensor feed-ins, limits its bandwidth, reduces external environment condition
Electromagnetic interference and improve Partial Discharge Detection sensitivity；TEV signals logarithmic amplifying circuit (213) are for transient earth voltage
Signal carries out non-linear amplification, and the signal to violent electric discharge phenomena carries out volitional check amplitude；TEV signal peak detecting circuits
(213) processed for being as short as ps grades of local discharge signal to the duration, extracted mostly important to Partial Discharge Detection
Amplitude signal；The setting of TEV signal peaks detecting circuit (213) sample rate is not less than 1MHz.
3. variable connector cabinet acoustoelectric signal harvester according to claim 1 and 2, it is characterised in that
TEV signal conditioning circuits module (21) are covered by radome (24)；The signal input of TEV signal conditioning circuits module (21)
Hold the signal output part through bnc interface (25) connection TEV sensors (11)；
Ultrasonic signal conditioning circuit module (22) is covered by radome (24)；The letter of ultrasonic signal conditioning circuit module (22)
Number input through another bnc interface (25) connection ultrasonic sensor (12) signal output part；
Two signal output parts of AD conversion module (23) are electrically connected with FPC (27), and FPC (27) adopt through winding displacement with master control
The signal input part electrical connection of set analysis circuit module (3).
4. variable connector cabinet acoustoelectric signal harvester according to claim 3, it is characterised in that
Pair signals conditioning module (2) is fixed on first substrate (6) through the first contact pin connector (26)；
Master control collection analysis circuit module (3), power supply unit (4) are each attached on second substrate (7)；
Master control collection analysis circuit module (3) includes mainboard (31), expansion interface (32), 485 interfaces (33) and minimum system plate
(34)；Mainboard (31) is arranged on second substrate (7)；Expansion interface (32) and 485 interfaces (33) are drawn by mainboard (31)；It is minimum
System board (34) is arranged on mainboard (31), and is connected with mainboard (31) through contact pin connector；The signal of minimum system plate (34)
Input is connected through winding displacement with FPC (27).
5. variable connector cabinet acoustoelectric signal harvester according to claim 4, it is characterised in that minimum system plate (34)
After receiving from the switch cubicle discharge signal after pair signals conditioning module (2) treatment, to transient earth voltage signal therein and
Ultrasonic signal extract local discharge characteristic data, and eventually through mainboard (31) draw RS485 interfaces (33) with Modbus
Monitoring Data is uploaded agreement the backstage (5) for supporting the agreement, or data are reached into LCD by expansion interface (32) shows
Screen, carries out LCD screen and shows on the spot.
6. variable connector cabinet acoustoelectric signal harvester according to claim 1, it is characterised in that power supply unit (4) by
Radome is protected；The output end of power supply unit (4) draws the second contact pin connector (43), and the second contact pin connector (43) is through solder joint
(42) power input lead with master control collection analysis circuit module (3) is connected；The power input of power supply unit (4) is drawn
Another group of the second contact pin connector (43), the contact pin connector of group second connects through another group of solder joint (42) and power interface (41)
Connect.
7. variable connector cabinet acoustoelectric signal harvester according to claim 2, it is characterised in that
TEV signaling multilevels filter circuit (211) are：The input of TEV signaling multilevels filter circuit (211) between output end according to
Secondary series connection accesses electric capacity C5, resistance R8, inductance L1With inductance L2；In TEV signaling multilevels filter circuit (211) input and electric capacity C5
Between select a node, the node respectively with diode D1Positive pole, diode D2Negative pole connection；Diode D1Negative pole and+5V
Resistance R is accessed between voltage1；Diode D1With resistance R1Between select a node, access resistance between the node and earth terminal
R3, resistance R2With electric capacity C2With resistance R after series connection3It is in parallel；Resistance R1A node is selected and+5V voltages between, the node and earth terminal
Between access electric capacity C1；Diode D2Positive pole and -5V voltages between access resistance R4；Diode D2With resistance R4Between select a knot
Point, accesses resistance R between the node and earth terminal6, resistance R5With electric capacity C4With resistance R after series connection6It is in parallel；Resistance R4With -5V
A node is selected between voltage, electric capacity C is accessed between the node and earth terminal3；In electric capacity C5With resistance R8Between select a node, should
Resistance R is accessed between node and earth terminal7；In resistance R8With inductance L1Between select a node, it is in parallel between the node and earth terminal
Access resistance R9, electric capacity C6, electric capacity C7；In inductance L1With inductance L2Between select a node, between the node and earth terminal and couple
Enter electric capacity C8, electric capacity C9；In inductance L2A node is selected and the output end of TEV signaling multilevels filter circuit (211) between, the node
It is in parallel and earth terminal between to access electric capacity C10, electric capacity C11, resistance R10；
TEV signals logarithmic amplifying circuit (212) are：TEV signals logarithmic amplifying circuit (212) input and logafier
Electric capacity C is accessed between the INHI pins of AD831012, electric capacity C12A node is selected between INHI pins, in the node and earth terminal
Between access resistance R11；Electric capacity C is accessed between the INLO pins and earth terminal of logafier AD831015；Logafier
Resistance R is accessed between the INHI pins and INLO pins of AD831013；The COMM pins ground connection of logafier AD8310；Logarithm
Electric capacity C is accessed between the BFIN pins and earth terminal of amplifier AD831014；Access is sequentially connected in series between+5V voltages and earth terminal
Resistance R12, electric capacity C13；Resistance R12With electric capacity C13Between select a node connect simultaneously logafier AD8310 ENBL pins,
Vpos pins；Electric capacity C is accessed between the OFLT pins and earth terminal of logafier AD831016；Logafier AD8310's
Vout pins extraction wire as TEV signals logarithmic amplifying circuit (212) signal output part；
TEV signal peaks detecting circuit (213) are：The pin 3 of operational amplifier A D8066 is used as signal input part；Operation amplifier
Resistance R is accessed between the pin 8 and+5V voltages of device AD806614；In the pin 8 and resistance R of operational amplifier A D806614Between
A node is selected, electric capacity C is accessed between the node and earth terminal17；The pin 4 of operational amplifier A D8066 is with -5V voltages indirectly
Enter resistance R16；Electric capacity C is accessed between the pin 4 and earth terminal of operational amplifier A D806618；The pipe of operational amplifier A D8066
The difference connecting resistance of pin 2 R15One end, diode D3Negative pole, resistance R15Another termination -5V voltages, diode D3Positive pole connect
The pin 1 of operational amplifier A D8066；The pin 1 of operational amplifier A D8066 meets diode D4Positive pole, diode D4Negative pole
Connect the pin 5 of operational amplifier A D8056；In diode D4Negative pole and the pin 5 of operational amplifier A D8056 between select a knot
Point, accesses electric capacity C between the node and earth terminal19, resistance R is accessed between the node and -5V17；Operational amplifier A D8056's
Pin 4 and pin 8 are in high-impedance state；The adapter pin 7 of pin 6 of operational amplifier A D8056；The pipe of operational amplifier A D8056
The extraction wire of pin 7, as the signal output part of TEV signal peaks detecting circuit (213).
8. a kind of acquisition method of variable connector cabinet acoustoelectric signal harvester as claimed in claim 1, it is characterised in that bag
Include following steps：
Step S1：Sensor assembly (1) receives office in partial discharge of switchgear signal, i.e. TEV sensors (11) search switch cabinet
The transient earth voltage signal in portion；Local ultrasonic signal in ultrasonic sensor (12) search switch cabinet；
Step S2：Pair signals conditioning module (2) receives the signal detected from sensor assembly (1), i.e.,：
TEV signal conditioning circuits module (21) receive the transient earth voltage signal detected from TEV sensors (11), and do as
Lower treatment：
Step S21：TEV signaling multilevels filter circuit (211) are filtered treatment to the signal for receiving, filter 3-100MHz with
Outer signal, and the signal after treatment is transmitted to TEV signals logarithmic amplifying circuit (212)；
Step S22：TEV signals logarithmic amplifying circuit (212) carry out non-linear amplification to transient earth voltage signal, and by after amplification
Signal be transmitted to TEV signal peaks detecting circuit (213)；
Step S23：The local discharge signal that TEV signal peaks detecting circuit (213) are as short as ps grades to the duration is processed,
The amplitude signal mostly important to Partial Discharge Detection is extracted, the signal after treatment is transmitted to master control collection point after being changed through A/D
Analysis circuit module (3)；
Ultrasonic signal conditioning circuit module (22) receives the ultrasonic signal detected from ultrasonic sensor (12), and does
Following treatment：
Step S21 '：Ultrasonic signal pre-amplification circuit (221) carries out the small-signal that ultrasonic sensor (12) is exported
Amplify, and the signal after treatment is reached into ultrasonic signal bandwidth-limited circuit (222)；
Step S22 '：Ultrasonic signal bandwidth-limited circuit (222) suppresses spuious to the input further frequency-selecting of ultrasonic signal
Background audio signals are disturbed, and the signal after treatment is reached into ultrasonic signal logarithmic amplifying circuit (223)；
Step S23 '：Ultrasonic signal logarithmic amplifying circuit (223) carries out non-linear amplification to ultrasonic signal, and by after amplification
Signal reach ultrasonic signal peak-detector circuit (224)；
Step S24 '：The local discharge signal that ultrasonic signal peak-detector circuit (224) is as short as ps grades to the duration is carried out
Treatment, extracts the amplitude signal mostly important to Partial Discharge Detection, and the signal after treatment is transmitted to master control after being changed through A/D to be adopted
Set analysis circuit module (3)；
Step S3：It is special that master control collection analysis circuit module (3) extracts shelf depreciation to transient earth voltage signal and ultrasonic signal
Data are levied, and Monitoring Data is uploaded by support with Modbus agreements eventually through the RS485 interfaces (33) that mainboard (31) is drawn and be somebody's turn to do
The backstage (5) of agreement；
Step S4：Backstage (5) carries out electric discharge amplitude, the displaying of historical data curve.
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| CN201410727334.9A CN104360252B (en) | 2014-12-03 | 2014-12-03 | A kind of variable connector cabinet acoustoelectric signal harvester and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104865511A (en) * | 2015-06-23 | 2015-08-26 | 国家电网公司 | Partial discharge detection device |
| CN106788383B (en) * | 2016-11-16 | 2024-01-26 | 天津市盛丹电子技术发展有限公司 | Weak signal conditioning circuit of non-electric quantity sensor |
| CN106970306A (en) * | 2017-04-07 | 2017-07-21 | 亿科电气股份有限公司 | A kind of partial discharge of switchgear monitoring system and monitoring method |
| CN108333485A (en) * | 2018-01-25 | 2018-07-27 | 武汉国能测控有限公司 | A kind of partial discharge of switchgear monitoring system |
| CN108802579A (en) * | 2018-05-18 | 2018-11-13 | 苏州树云网络科技有限公司 | A kind of system for monitoring ring main unit on-line |
| CN110763959B (en) * | 2019-09-24 | 2022-02-22 | 武汉汉源既济电力有限公司 | High-voltage switch cabinet partial discharge detection method |
| CN112649395B (en) * | 2019-10-10 | 2024-03-08 | 漳州英特捷自动化科技有限公司 | Online near-infrared moisture meter |
| CN110687420A (en) * | 2019-11-15 | 2020-01-14 | 河南宏博测控技术有限公司 | Split type partial discharge detection device |
| CN111665420A (en) * | 2020-05-29 | 2020-09-15 | 杭州电子科技大学 | Ultrasonic partial discharge detection device and detection method thereof |
| CN112462214B (en) * | 2020-11-26 | 2023-01-20 | 云南电网有限责任公司电力科学研究院 | Intelligent sensing terminal for partial discharge |
| CN115078937A (en) * | 2022-08-15 | 2022-09-20 | 国网浙江省电力有限公司宁波供电公司 | Ultrasonic vibration fusion self-adaptive conditioning circuit and flexible module |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH01277774A (en) * | 1988-04-29 | 1989-11-08 | Tokyo Electric Power Co Inc:The | Detecting device of partial discharge |
| CN102692588A (en) * | 2012-06-08 | 2012-09-26 | 华北电力大学（保定） | Partial discharge detecting and positioning system and method of high-tension switch cabinet |
| CN103278751B (en) * | 2013-04-27 | 2014-11-19 | 国家电网公司 | Partial discharge comprehensive itinerant detector for high voltage electric power equipment |
| CN103529371B (en) * | 2013-11-01 | 2015-11-25 | 国网上海市电力公司 | A kind of intrusive mood controller switching equipment local discharge on-line monitoring device |
| CN203773013U (en) * | 2014-03-24 | 2014-08-13 | 三泰电力技术（南京）股份有限公司 | Partial discharging detector |
| CN204269766U (en) * | 2014-12-03 | 2015-04-15 | 国家电网公司 | A kind of multi-way switch cabinet acoustoelectric signal harvester |
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Address after: 100031 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing Co-patentee after: Electric Power Research Institute of State Grid Anhui Electric Power Company Patentee after: State Grid Corporation of China Co-patentee after: Red phase Limited by Share Ltd Address before: 100031 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing Co-patentee before: Electric Power Research Institute of State Grid Anhui Electric Power Company Patentee before: State Grid Corporation of China Co-patentee before: Xiamen Red Phase Instruments Inc. |
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