CN105277907B - A kind of site assessment system of partial discharge sensor - Google Patents
A kind of site assessment system of partial discharge sensor Download PDFInfo
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- CN105277907B CN105277907B CN201510638447.6A CN201510638447A CN105277907B CN 105277907 B CN105277907 B CN 105277907B CN 201510638447 A CN201510638447 A CN 201510638447A CN 105277907 B CN105277907 B CN 105277907B
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Abstract
The invention discloses a kind of site assessment systems of partial discharge sensor, including signal generating module, substation's GIS device, signal acquisition module, safety detection module, radio receiving transmitting module and data processing server；Signal generating module is connected with substation GIS device, signal generating module generates superfrequency pulse signal to substation's GIS device injected pulse signal, and the occurrence frequency and amplitude of superfrequency pulse signal send out instruction control by data processing server by radio receiving transmitting module；The present invention can simulate different local discharge signal models by signal generating module, by injecting inside GIS, signal is received by extra-high video sensor, the model signals of judgement result and signal generating module are compared, assess the performance of GIS built-in sensors, it can realize and built-in sensor safe sex chromosome mosaicism is detected, the result of detection is wirelessly sent to data processing server end.
Description
Technical field
A kind of a kind of device of technical field of power systems, and in particular to site assessment system of partial discharge sensor.
Background technology
GIS is common important equipment in electric system, and the portions GIS pass through there are will produce shelf depreciation when insulation defect
It can effectively judge the detection of shelf depreciation the state of insulation of switchgear, effectively detect shelf depreciation to ensuring out GIS
Safe and stable operation be of great significance.
The partial discharge phenomenon generated due to insulation defect inside GIS includes mainly the electric discharge of corona defect, void defects
Electric discharge, the electric discharge of suspension electrode defect and particle defects four types of electric discharge, partial discharge pulse's wave have with power frequency supply phase
Strong correlation, such as：The partial discharge pulse of corona defect electric discharge mostly occurs on power frequency supply negative half period；Air gap lacks
Flash-over characteristic when voltage forward or backwards is born at sunken both ends is more consistent, therefore the positive-negative half-cycle of its partial discharge pulse distribution
Symmetrical and correlation is strong；Suspension electrode defect between high-pressure side and earth shield, and be both not attached to, therefore its is positive and negative
Also number that is more symmetrical and occurring is more rare for the partial discharge pulse of half cycle；Particle defects electric discharge with the bounce of particle and
Electric discharge is generated, partial discharge pulse's number is rare and the generation moment is uncorrelated to operating frequency phase.
At present inside GIS in the detection method of local discharge signal, superfrequency method is that current realization GIS partial discharge is online
The method of practical is compared in monitoring.Superfrequency method is to receive the discharge excited 300MHz to 3GHz in part using sensor
Electromagnetic wave monitors shelf depreciation.The monitoring range of superfrequency method is wider, and number of sensors is less when on-line monitoring, shelf depreciation
On-line checking and positioning are quick and convenient.Superfrequency method can not be replaced since it has in terms of switchgear partial discharge monitoring
The advantage in generation has become the main means of the live Partial Discharge Detection of GIS operations in recent years.
Therefore the performance of built-in extra-high video sensor plays deciding factor for testing result.Have on the market at present a large amount of
Local discharge detection device, including handhold portable detection device and on-Line Monitor Device etc..It is electric caused by shelf depreciation
Magnetic vibration will produce electromagnetic wave, and in solid and gas and gas medium, very abundant electromagnetism baud can occur for partial discharge pulse's wave
High fdrequency component, the electricity of the 300MHz to 3GHz excited when superfrequency Partial Discharge Detection equipment is by monitoring shelf depreciation in GIS
Magnetic wave judges the seriousness of GIS built-in electrical insulation defect failures.But for the qualification of GIS built-in sensors, lack inspection
Survey means.
Invention content
The purpose of the present invention is be to overcome the deficiencies of existing technologies and the true four kinds of typical cases of simulation can be generated by providing
Local discharge signal, superfrequency part discharge signal acquisition module pass through detect local discharge signal occur module generate part
Discharge signal shows testing result, is compared in model signals, to assess the performance of built-in sensors.
Technical solution of the present invention is as follows：
A kind of site assessment system of partial discharge sensor (local discharge sensor), including signal generating module, substation
GIS device, signal acquisition module, safety detection module, radio receiving transmitting module and data processing server 6；
Signal generating module is connected with substation GIS device, and signal generating module generates superfrequency pulse signal
(300MHz-3GHz) to substation's GIS device injected pulse signal, the occurrence frequency and amplitude of superfrequency pulse signal are by data
Processing server sends out instruction control by radio receiving transmitting module；
Extra-high video sensor (300MHz-3GHz) built in substation's GIS device is evaluation object；
Signal acquisition module is used to acquire the ultrahigh-frequency signal for receiving substation's GIS device, and collection result is by wirelessly receiving
Hair module is sent to data processing server；
Safety detection module is used to assess the security performance of built-in extra-high video sensor, including test ground resistance, electricity
The characterisitic parameters such as appearance, with superfrequency sensor safe performance built in assessment, if injury can be generated to operating personnel.
Radio receiving transmitting module, for carrying out channel radio with signal generating module, signal acquisition module, safety inspection module
News send order and receive data result, logical by wireless or USB between radio receiving transmitting module and data processing server
News.
Data processing server, for controlling signal generating module and display assessment result.
Signal generating module generates shelf depreciation type signal (four kinds of shelf depreciation type signals：Corona discharge signal, gas
Gap discharge signal, suspension electrode discharge signal and particulate electric discharge signal), and exported by interface, it can be to Partial Discharge Detection
Equipment carries out the application such as verifying.Signal generating module 1 is based on light and carries out power frequency synchronously simulating partial discharge signal generator, adopts
Light strong and weak signals are obtained with photodiode, to obtain power supply power frequency locking phase, the multicycle signal of generation can be with electricity
Source voltage-phase precise synchronization, convenient for doing availability deciding to Partial Discharge Detection equipment.
General signal source can only use the repetition rate of therein equipment, such as the 50Hz period incidences letter of setting
Number, i.e., output signal is synchronous with the holding of the signal of 50Hz.But since the frequency of network voltage is not accurate 50Hz, generally exist
It waves between 49Hz~51Hz, therefore the signal generating module of the present invention, the analog signal of generation, which can be mended precisely, grabs synchronous letter
Number phase, ensure repeatedly to generate synchronized relation with 50Hz between signal.
Signal generating module include the first wireless transceiver circuit, synchronous trigger circuit, signal generating circuit, keyboard button and
Output interface；First wireless transceiver circuit, synchronous trigger circuit, signal generating circuit and output interface are linked in sequence successively, key
Disk button is connected with signal generating circuit.
Output interface is N-type, BNC SMA heads.
Signal acquisition module includes detecting circuit, and detecting circuit includes the first detector diode D1, the second detector diode
D2, first resistor R1, second resistance R2, the first capacitance C1, the second capacitance C2 and third capacitance C3；Second resistance R2, the second electricity
Hold C2 series connection after be connected between power supply and ground wire, the first detector diode D1, the second detector diode D2 be connected in series with after with
Second capacitance C2 is in parallel, and first resistor R1 is in parallel with the second capacitance C2, one end connection ultrahigh-frequency signal input of the first capacitance C1
End, the other end are connected between the anode of the cathode of the first detector diode D1, the second detector diode D2, third capacitance C3's
One end connects the cathode of the second detector diode D2, and the other end is that peak holding detects signal output end.
Safety detection module includes partial discharge sensor safe detection circuit, partial discharge sensor safe detection circuit packet
Wireless transceiver circuit, 555 timely checking circuits, display and push-button unit and interface circuit are included, wireless transceiver circuit shows and presses
Key unit, interface circuit are connected with 555 timely checking circuits.
555 timely checking circuits include multi-resonant oscillating circuit, and multi-resonant oscillating circuit includes 555 timers, first resistor
R11, second resistance R12, the first capacitance C11, the second capacitance C12, the first relay K1 and the second relay K2；First resistor
R11 is connected to the reset terminal and discharge end of 555 timers, and reset terminal connects power end, relay K1, second resistance R12 series connection
Be connected to after connection between the discharge end and triggering end of 555 timers, triggering end, threshold value end are connected, the first capacitance C11, after
Electric appliance K2 is connected to after being connected in series between the triggering end and ground terminal of 555 timers, and the second capacitance C12 is connected to 555 timings
Between the control voltage end and ground terminal of device.
555 timely checking circuits include measuring the capacitance of resistance value and measurement core end over the ground of core end over the ground, tool
Body includes the following steps：
S1 measures the resistance of core end over the ground, specifically includes following steps,
S101 disconnects the first relay K1, the core end of partial discharge sensor is connected to the discharge end of 555 timers, office
The shell end for putting sensor is connected to triggering end, and the resistance value measured between discharge end and triggering end is to measure the electricity of core end over the ground
Hinder the resistance value of RX；
555 timely checking circuit of S102,555 timers monostable circuit generates impulse waveform：Power on, power Vcc
By RX pairs of the first capacitance C11 charging of the resistance of first resistor R11 and core end over the ground, Uc1 is the electricity at the first both ends capacitance C11
Pressure value, as Uc1 ＜ 1/3Vcc, the oscillator output level Vo=1 inside 555 timers, the discharge tube inside 555 timers
Cut-off；When Uc1 is charged to >=2/3Vcc after, the oscillator output level Vo inside 555 timers is turned into 0, at this time discharge tube
Conducting, makes discharge end be grounded, the first capacitance C11 is discharged over the ground by the resistance RX of core end over the ground, and Uc1 is made to decline；When under Uc1
Drop to≤1/3Vcc after, the oscillator output level Vo inside 555 timers is turned into 1, and discharge tube cut-off makes discharge end not connect
Ground, power Vcc again charge to the first capacitance C11 by the resistance RX of first resistor and core end over the ground, make Uc1 from 1/3Vcc
It is raised to 2/3Vcc, the trigger inside 555 timers is overturn；
S103 repeats step S102, and the oscillating impulse waveform of consecutive variations is obtained in output end vo；The pulse of oscillating impulse
The low duration t of widthPL=0.693*RX*C1 is determined by capacitance C11 discharge times；The pulse width of oscillating impulse
High level lasting time tPH=0.693* (R1+RX) * C1, are determined, pulse period T=t by the capacitance C11 charging timePL+tPH；
S104 reads the low and high level of the output end of 555 timers, obtains output pulse frequency f, calculate core end pair
The resistance value RX on ground；
S2 measures the capacitance of core end over the ground, specifically includes following steps,
S201 disconnects the second relay K2, the core end of partial discharge sensor is connected to the triggering end of 555 timers, office
It is to measure core end direct-to-ground capacitance to put the capacitance that the cage connection of sensor measures between ground terminal, triggering end and ground terminal
The capacitance of CX；
S202,555 timely checking circuits generate impulse waveform：Power on, power Vcc passes through first resistor R11 and
Two resistance R12 charge to core end direct-to-ground capacitance CX, and Ucx is the voltage value at the core end both ends direct-to-ground capacitance CX, as Ucx ＜ 1/
When 3Vcc, the oscillator output level Vo=1 inside 555 timers, discharge tube cut-off；When Ucx is charged to >=2/3Vcc after,
Oscillator output Vo inside 555 timers is turned into 0, and discharge tube conducting makes discharge end (DIS) be grounded, and core end is electric over the ground
Hold CX to discharge over the ground by second resistance R12, Ucx is made to decline；When Ucx drops to≤1/3Vcc after, shaking inside 555 timers
It swings device output level Vo and is turned into 1, discharge tube cut-off keeps discharge end earth-free, power Vcc passes through first resistor R11 and second
Resistance R12 charges to capacitance CX, so that Ucx is risen to 2/3Vcc from 1/3Vcc, the trigger inside 555 timers is overturn；
S203 repeats step S202, the oscillating impulse waveform of consecutive variations is obtained in output end；The pulse of oscillating impulse is wide
The low duration t of degreePL=0.693*R12*CX is determined by core end direct-to-ground capacitance CX discharge times；
The high level lasting time t of the pulse width of oscillating impulsePH=0.693* (R11+R12) * CX, over the ground by core end
The charging time decision of capacitance CX, pulse period T=tPL+tPH；
S204, the output end low and high level for reading 555 timers obtain output pulse frequency f, calculate core end over the ground
Capacitance CX capacitance；
Radio receiving transmitting module is Zigbee module, integrated enhanced 8051CPU and ZigBee radio receiving transmitting modules, relative to
The scheme of traditional CPU+ radio transmitting and receiving chips reduces peripheral hardware quantity, reduces system cost, in addition has different operation moulds
Formula, standby current is only 1uA under Sleep Timer Running patterns so that it especially adapt to super low-power consumption requirement be
It unites, the conversion time between operational mode is short to further ensure low energy expenditure.
Compared with prior art, advantageous effect of the present invention includes：
The present invention discloses a kind of site assessment system of partial discharge sensor, can be simulated by signal generating module different
Local discharge signal model receives signal by extra-high video sensor, is adopted by signal acquisition module by injecting inside GIS
Monitor set judges that the model signals of result and signal generating module are compared, it can be estimated that the performance of GIS built-in sensors；
In addition safety detection module, which can be realized, is detected built-in sensor safe sex chromosome mosaicism, the result of detection is passed through wireless
Mode be sent to data processing server end.
Description of the drawings
Fig. 1 is a kind of site assessment system structure diagram of partial discharge sensor of the present invention；
Fig. 2 is signal generating module structural schematic diagram；
Fig. 3 is signal acquisition module circuit diagram；
Fig. 4 is partial discharge sensor safe detection circuit structural schematic diagram；
Fig. 5 is multi-resonant oscillating circuit circuit diagram；
Fig. 6 is the circuit diagram of the resistance measurement circuit of core end over the ground；
Fig. 7 is the circuit diagram of the capacitance measurement circuit of core end over the ground.
Specific implementation mode
The present invention is further described below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of site assessment system of partial discharge sensor, including signal generating module 1, substation GIS are set
Standby 2, signal acquisition module 3, safety detection module 4, radio receiving transmitting module 5 and data processing server 6.
Signal generating module 1 is connected with substation GIS device 2, and signal generating module 1 generates superfrequency pulse signal
(300MHz-3GHz) to substation's GIS device injected pulse signal, the occurrence frequency and amplitude of superfrequency pulse signal are by data
Processing server 6 sends out instruction control by radio receiving transmitting module 5；
Extra-high video sensor (300MHz-3GHz) built in substation's GIS device 2 is evaluation object；
Signal acquisition module 3 is used to acquire the ultrahigh-frequency signal for receiving substation's GIS device 2, and collection result passes through wireless
Transceiver module 5 is sent to data processing server 6；
Safety detection module 4 is used to assess the security performance of built-in extra-high video sensor, including test ground resistance, electricity
The characterisitic parameters such as appearance, with superfrequency sensor safe performance built in assessment, if injury can be generated to operating personnel.
Radio receiving transmitting module 5, for being carried out wirelessly with signal generating module 1, signal acquisition module 3, safety inspection module 4
Communication sends order and receives data result, passes through wireless or USB between radio receiving transmitting module 5 and data processing server 6
Communication.
Data processing server 6, for controlling signal generating module 1 and display assessment result.
Signal generating module 1 generates shelf depreciation type signal (four kinds of shelf depreciation type signals：Corona discharge signal,
Bubble-discharge signal, suspension electrode discharge signal and particulate electric discharge signal), and exported by interface, shelf depreciation can be examined
Measurement equipment carries out the application such as verifying.Signal generating module 1 is based on light and carries out power frequency synchronously simulating partial discharge signal generator,
Light strong and weak signals are obtained using photodiode, to obtain power supply power frequency locking phase, the multicycle signal of generation can be with
Supply voltage phase precise synchronization, convenient for doing availability deciding to Partial Discharge Detection equipment.
General signal source can only use the repetition rate of therein equipment, such as the 50Hz period incidences letter of setting
Number, i.e., output signal is synchronous with the holding of the signal of 50Hz.But since the frequency of network voltage is not accurate 50Hz, generally exist
It waves between 49Hz~51Hz, therefore the signal generating module of the present invention, the analog signal of generation, which can be mended precisely, grabs synchronous letter
Number phase, ensure repeatedly to generate synchronized relation with 50Hz between signal.
As shown in Fig. 2, signal generating module 1 includes the first wireless transceiver circuit 101, synchronous trigger circuit 102, signal hair
Raw circuit 103, keyboard button 104 and output interface 105；First wireless transceiver circuit 101, synchronous trigger circuit 102, signal hair
Raw circuit 103 and output interface 105 are linked in sequence successively, and keyboard button 104 is connected with signal generating circuit 103.
Output interface 105 is N-type, BNC SMA heads.
Signal acquisition module 3 includes detecting circuit, as shown in figure 3, detecting circuit includes the first detector diode D1, second
Detector diode D2, first resistor R1, second resistance R2, the first capacitance C1, the second capacitance C2 and third capacitance C3；Second resistance
It is connected between power supply and ground wire after R2, the second capacitance C2 series connection, the first detector diode D1, the second detector diode D2 series connection
In parallel with the second capacitance C2 after connection, first resistor R1 is in parallel with the second capacitance C2, and one end of the first capacitance C1 connects superfrequency
Signal input part, the other end are connected between the anode of the cathode of the first detector diode D1, the second detector diode D2, third
One end of capacitance C3 connects the cathode of the second detector diode D2, and the other end is that peak holding detects signal output end.
As shown in figure 4, safety detection module 4 includes partial discharge sensor safe detection circuit, partial discharge sensor safe
Property detection circuit includes wireless transceiver circuit a, 555 timely checking circuit b, display and push-button unit c and interface circuit d, wirelessly
Transmission circuit a, display and push-button unit c, interface circuit d are connected with 555 timely checking circuit b.
555 timely checking circuit b include multi-resonant oscillating circuit, as shown in figure 5, multi-resonant oscillating circuit include 555 timers,
First resistor R11, second resistance R12, the first capacitance C11, the second capacitance C12, the first relay K1 and the second relay K2；The
One resistance R11 is connected to the reset terminal RST and discharge end DIS of 555 timers, reset terminal RST connection power end VCC, relay
K1, second resistance R12 are connected to after being connected in series between the discharge end DIS of 555 timers and triggering end TRI, triggering end TRI,
Threshold value end THR is connected, and the first capacitance C11, relay K2 are connected to the triggering end TRI of 555 timers and connect after being connected in series with
Between ground terminal GND, the second capacitance C12 is connected between the control voltage end CON of 555 timers and ground terminal GND.Second capacitance
C12 is definite value capacitance, is 100nF.
555 timely checking circuits include measuring the capacitance of resistance value and measurement core end over the ground of core end over the ground, tool
Body includes the following steps：
S1 measures the resistance of core end over the ground, specifically includes following steps,
The core end of partial discharge sensor is connected to 555 timers by S101 as shown in fig. 6, disconnecting the first relay K1
The shell end of discharge end DIS, partial discharge sensor are connected to triggering end TRI, the resistance measured between discharge end DIS and triggering end TRI
The resistance value of resistance RX of the value for measurement core end over the ground；
S102,555 timely checking circuits generate impulse waveform：Power on, power Vcc passes through first resistor R11 and line
RX pairs of the first capacitance C11 charging of the resistance of core end over the ground, Uc1 is the voltage value at the first both ends capacitance C11, as Uc1 ＜ 1/3Vcc
When, the oscillator output level Vo=1 inside 555 timers, the discharge tube cut-off inside 555 timers；When Uc1 is charged to >=
After 2/3Vcc, the oscillator output level Vo inside 555 timers is turned into 0, and discharge tube is connected at this time, and discharge end DIS is made to connect
Ground, the first capacitance C11 are discharged over the ground by the resistance RX of core end over the ground, and Uc1 is made to decline；When Uc1 drops to≤1/3Vcc after,
Oscillator output level Vo inside 555 timers is turned into 1, and discharge tube cut-off keeps discharge end DIS earth-free, and power Vcc is logical
The resistance RX of first resistor and core end over the ground is crossed again to the first capacitance C11 chargings, and Uc1 is made to rise to 2/3Vcc from 1/3Vcc,
Trigger inside 555 timers is overturn；
S103 repeats step S102, and the oscillating impulse waveform of consecutive variations is obtained in output end vo；The pulse of oscillating impulse
The low duration t of widthPL=0.693*RX*C1 is determined by capacitance C11 discharge times；The pulse width of oscillating impulse
High level lasting time tPH=0.693* (R1+RX) * C1, are determined, pulse period T=t by the capacitance C11 charging timePL+tPH；
S104 reads the low and high level of the output end OUT of 555 timers, obtains output pulse frequency f, calculate core
The resistance value RX of end over the ground；
S2 measures the capacitance of core end over the ground, specifically includes following steps,
The core end of partial discharge sensor is connected to 555 timers by S201 as shown in fig. 7, disconnecting the second relay K2
Triggering end TRI, the capacitance that the cage connection of partial discharge sensor measures between ground terminal GND, triggering end TRI and ground terminal GND
Value is to measure the capacitance of core end direct-to-ground capacitance CX；
S202,555 timer monostable circuit, 555 timely checking circuit generate impulse waveform：Power on, power Vcc
It is charged to core end direct-to-ground capacitance CX by first resistor R11 and second resistance R12, Ucx is the core end both ends direct-to-ground capacitance CX
Voltage value, as Ucx ＜ 1/3Vcc, the oscillator output level Vo=1 inside 555 timers, discharge tube cut-off；Work as Ucx
Be charged to >=2/3Vcc after, oscillator inside 555 timers output Vo is turned into 0, and discharge tube conducting makes discharge end DIS connect
Ground, core end direct-to-ground capacitance CX are discharged over the ground by second resistance R12, and Ucx is made to decline；When Ucx drops to≤1/3Vcc after,
Oscillator output level Vo inside 555 timers is turned into 1, and discharge tube cut-off keeps discharge end DIS earth-free, and power Vcc is logical
It crosses first resistor R11 and second resistance R12 to charge to capacitance CX, Ucx is made to rise to 2/3Vcc from 1/3Vcc, in 555 timers
The trigger in portion is overturn；
S203 repeats step S202, the oscillating impulse waveform of consecutive variations is obtained in output end OUT；The arteries and veins of oscillating impulse
Rush the low duration t of widthPL=0.693*R12*CX is determined by core end direct-to-ground capacitance CX discharge times；
The high level lasting time t of the pulse width of oscillating impulsePH=0.693* (R11+R12) * CX, over the ground by core end
The charging time decision of capacitance CX, pulse period T=tPL+tPH；
S204, the output end OUT low and high levels for reading 555 timers obtain output pulse frequency f, calculate core end pair
The capacitance of the capacitance CX on ground；
Radio receiving transmitting module is Zigbee module, integrated enhanced 8051CPU and ZigBee radio receiving transmitting modules, relative to
The scheme of traditional CPU+ radio transmitting and receiving chips reduces peripheral hardware quantity, reduces system cost, in addition has different operation moulds
Formula, standby current is only 1uA under Sleep Timer Running patterns so that it especially adapt to super low-power consumption requirement be
It unites, the conversion time between operational mode is short to further ensure low energy expenditure.
The above is only a preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (9)
1. a kind of site assessment system of partial discharge sensor, which is characterized in that set including signal generating module (1), substation GIS
Standby (2), signal acquisition module (3), safety detection module (4), radio receiving transmitting module (5) and data processing server (6)；
The signal generating module (1) is connected with substation's GIS device (2), and signal generating module (1) generates superfrequency pulse
Signal is to substation's GIS device injected pulse signal, and the occurrence frequency and amplitude of the superfrequency pulse signal are by data processing
Server (6) sends out instruction control by radio receiving transmitting module (5)；
Extra-high video sensor built in substation's GIS device (2) is evaluation object；
The signal acquisition module (3) is used to acquire the ultrahigh-frequency signal for receiving substation's GIS device (2), and collection result passes through
Radio receiving transmitting module (5) is sent to data processing server (6)；
The safety detection module (4) is used to assess the security performance of built-in extra-high video sensor；
The radio receiving transmitting module (5), for examining module (4) with signal generating module (1), signal acquisition module (3), safety
It communicates wirelessly；
The data processing server (6), for controlling signal generating module (1) and display assessment result；
The signal generating module (1) generates shelf depreciation type signal, and is exported by interface, to Partial Discharge Detection equipment
It is verified；
Signal generating module 1 is based on light and carries out power frequency synchronously simulating partial discharge signal generator, is obtained using photodiode
Light strong and weak signals are taken, power supply power frequency locking phase is obtained.
2. a kind of site assessment system of partial discharge sensor according to claim 1, which is characterized in that
The signal generating module (1) includes the first wireless transceiver circuit (101), synchronous trigger circuit (102), signal generation electricity
Road (103), keyboard button (104) and output interface (105)；First wireless transceiver circuit (101), synchronous trigger circuit
(102), signal generating circuit (103) and output interface (105) are linked in sequence successively, and electricity occurs for keyboard button (104) and signal
Road (103) is connected.
3. a kind of site assessment system of partial discharge sensor according to claim 2, which is characterized in that
The output interface (105) is N-type, BNC SMA heads.
4. a kind of site assessment system of partial discharge sensor according to claim 1, which is characterized in that
The signal acquisition module (3) includes detecting circuit, and the detecting circuit includes the first detector diode D1, the second detection
Diode D2, first resistor R1, second resistance R2, the first capacitance C1, the second capacitance C2 and third capacitance C3；The second resistance
It is connected between power supply and ground wire after R2, the second capacitance C2 series connection, the first detector diode D1, the second detector diode D2
In parallel with the second capacitance C2 after being connected in series with, the first resistor R1 is in parallel with the second capacitance C2, and one end of the first capacitance C1 connects
Ultrahigh-frequency signal input terminal is connect, the other end is connected to the anode of the cathode of the first detector diode D1, the second detector diode D2
Between, one end of third capacitance C3 connects the cathode of the second detector diode D2, and the other end is that peak holding detects signal output
End.
5. a kind of site assessment system of partial discharge sensor according to claim 1, which is characterized in that
The safety detection module (4) includes partial discharge sensor safe detection circuit, partial discharge sensor safe detection electricity
Road includes wireless transceiver circuit (a), 555 timely checking circuits (b), display and push-button unit (c) and interface circuit (d), described
Wireless transceiver circuit (a), display and push-button unit (c), interface circuit (d) are connected with 555 timely checking circuit (b)
It connects.
6. a kind of site assessment system of partial discharge sensor according to claim 5, which is characterized in that
555 timely checking circuit (b) includes multi-resonant oscillating circuit, and the multi-resonant oscillating circuit includes 555 timers, first
Resistance R11, second resistance R12, the first capacitance C11, the second capacitance C12, the first relay K1 and the second relay K2；First electricity
Resistance R11 is connected to the reset terminal (RST) and discharge end (DIS) of 555 timers, and reset terminal (RST) connects power end (VCC), institute
State relay K1, second resistance R12 be connected to after being connected in series with 555 timers discharge end (DIS) and triggering end (TRI) it
Between, the triggering end (TRI), threshold value end (THR) are connected, and the first capacitance C11, relay K2 are connected to after being connected in series with
Between the triggering end (TRI) and ground terminal (GND) of 555 timers, the second capacitance C12 is connected to the control of 555 timers
Between voltage end (CON) and ground terminal (GND).
7. a kind of site assessment system of partial discharge sensor according to claim 6, which is characterized in that
555 timely checking circuit (b) includes measuring the capacitance of resistance value and measurement core end over the ground of core end over the ground,
Specifically include following steps：
S1 measures the resistance of core end over the ground, specifically includes following steps,
S101 disconnects the first relay K1, the core end of partial discharge sensor is connected to the discharge end (DIS) of 555 timers, office
The shell end for putting sensor is connected to triggering end (TRI), and the resistance value measured between discharge end (DIS) and triggering end (TRI) is to survey
Measure the resistance value of the resistance RX of core end over the ground；
S102,555 timely checking circuits generate impulse waveform：Power on, power Vcc passes through first resistor R11 and core end
RX pairs of the first capacitance C11 charging of resistance over the ground, Uc1 is the voltage value at the first both ends capacitance C11, as Uc1 ＜ 1/3Vcc,
Oscillator output level Vo=1 inside 555 timers, the discharge tube cut-off inside 555 timers；When Uc1 is charged to >=2/
After 3Vcc, the oscillator output level Vo inside 555 timers is turned into 0, and discharge tube is connected at this time, and discharge end (DIS) is made to connect
Ground, the first capacitance C11 are discharged over the ground by the resistance RX of core end over the ground, and Uc1 is made to decline；When Uc1 drops to≤1/3Vcc after,
Oscillator output level Vo inside 555 timers is turned into 1, and discharge tube cut-off keeps discharge end (DIS) earth-free, power Vcc
By the resistance RX of first resistor and core end over the ground again to the first capacitance C11 chargings, Uc1 is made to rise to 2/ from 1/3Vcc
3Vcc, the trigger inside 555 timers are overturn；
S103 repeats step S102, and the oscillating impulse waveform of consecutive variations is obtained in output end vo；The pulse width of oscillating impulse
Low duration tPL=0.693*RX*C11 is determined by capacitance C11 discharge times；The height of the pulse width of oscillating impulse
Level duration tPH=0.693* (R1+RX) * C11, are determined, pulse period T=t by the capacitance C11 charging timePL+tPH；
S104 reads the low and high level of the output end (OUT) of 555 timers, obtains output pulse frequency f, calculate core end
Resistance value RX over the ground；
S2 measures the capacitance of core end over the ground, specifically includes following steps,
S201 disconnects the second relay K2, the core end of partial discharge sensor is connected to the triggering end (TRI) of 555 timers, office
It is to survey to put the capacitance that the cage connection of sensor measures between ground terminal (GND), triggering end (TRI) and ground terminal (GND)
Measure the capacitance of core end direct-to-ground capacitance CX；
S202,555 timer monostable circuit, 555 timely checking circuit generate impulse waveform：Power on, power Vcc passes through
First resistor R11 and second resistance R12 charges to core end direct-to-ground capacitance CX, and Ucx is the electricity at the core end both ends direct-to-ground capacitance CX
Pressure value, as Ucx ＜ 1/3Vcc, the oscillator output level Vo=1 inside 555 timers, discharge tube cut-off；When Ucx charges
After to >=2/3Vcc, the oscillator output Vo inside 555 timers is turned into 0, and discharge tube conducting makes discharge end (DIS) be grounded,
Core end direct-to-ground capacitance CX is discharged over the ground by second resistance R12, and Ucx is made to decline；When Ucx drops to≤1/3Vcc after, 555 is fixed
When device inside oscillator output level Vo be turned into 1, discharge tube cut-off keeps discharge end (DIS) earth-free, power Vcc passes through
First resistor R11 and second resistance R12 charges to capacitance CX, and Ucx is made to rise to 2/3Vcc from 1/3Vcc, inside 555 timers
Trigger overturn；
S203 repeats step S202, the oscillating impulse waveform of consecutive variations is obtained in output end (OUT)；The pulse of oscillating impulse
The low duration t of widthPL=0.693*R12*CX is determined by core end direct-to-ground capacitance CX discharge times；
The high level lasting time t of the pulse width of oscillating impulsePH=0.693* (R11+R12) * CX, by core end direct-to-ground capacitance
The charging time decision of CX, pulse period T=tPL+tPH；
S204, output end (OUT) low and high level for reading 555 timers obtain output pulse frequency f, calculate core end over the ground
Capacitance CX capacitance；
If R11=R12,
8. a kind of site assessment system of partial discharge sensor according to claim 1, which is characterized in that
The radio receiving transmitting module is Zigbee module.
9. a kind of site assessment system of partial discharge sensor according to claim 1, which is characterized in that
The shelf depreciation type signal that the signal generating module (1) generates includes corona discharge signal, bubble-discharge signal, hangs
Floating electrode discharge signal and particulate electric discharge signal.
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| CN109541414A (en) * | 2018-12-24 | 2019-03-29 | 南京海曼网络科技有限公司 | A kind of site assessment system of partial discharge sensor |
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| CN112394267B (en) * | 2020-12-04 | 2023-07-21 | 国家电网有限公司 | High-speed data acquisition board for cable partial discharge signals |
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