CN207232368U - A kind of inspection circuit of the extra-high video sensor effective height of partial discharge of transformer - Google Patents
A kind of inspection circuit of the extra-high video sensor effective height of partial discharge of transformer Download PDFInfo
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- CN207232368U CN207232368U CN201721048378.4U CN201721048378U CN207232368U CN 207232368 U CN207232368 U CN 207232368U CN 201721048378 U CN201721048378 U CN 201721048378U CN 207232368 U CN207232368 U CN 207232368U
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Abstract
It the utility model is related to status of electric power detection and fault diagnosis technology field, more particularly to a kind of inspection circuit of the extra-high video sensor effective height of partial discharge of transformer, pulse signal source, electromagnetic wave cell, oscillograph, Measurement ＆control computer, reference antenna, tested extra-high video sensor are specifically included；Pulse signal source is connected with electromagnetic wave cell and Measurement ＆control computer respectively, and oscillograph is connected with pulse signal source, Measurement ＆control computer, reference antenna and tested extra-high video sensor respectively, and exploration hole is set at the top of electromagnetic wave cell；Exploration hole is located at the top of gtem cell in the region of terminal 1/4 1/2；Reference antenna and tested extra-high video sensor are placed at the exploration hole of electromagnetic wave cell.The utility model broken away from can not product control examine extra-high video sensor effective height predicament, help to improve increment power equipment product control quality, the general level of the health and service efficiency, realize that the synthesis of risk, efficiency and cost is optimal.
Description
Technical field
It the utility model is related to status of electric power detection and fault diagnosis technology field, and in particular to a kind of transformer partial
The inspection circuit of the extra-high video sensor effective height of portion's electric discharge.
Background technology
The built-in electrical insulation of oil-immersed transformer uses oilpaper composite construction, may be summarized to be five kinds of insulation combination moulds substantially
Formula：Pure oil-gap insulation, solid insulation, covering or insulating layer, covering and interpolar partition plate, multilayer interpolar partition plate.Shelf depreciation
It is one of key character parameter for reflecting electric power transformer insulated performance, it is sign and the performance of electric power transformer insulated deterioration
Form, and be the reason for causing its insulation further to deteriorate.Shelf depreciation is acted on minor insulation inside power transformer
Electric field strength exceed the SI semi-insulation dielectric strength（Refer to the electric field strength that insulation is actually resistant to）, on minor insulation
The electric discharge phenomena of generation.Different types of electric discharge is produced respectively in above-mentioned five kinds of insulation combination patterns, such as：Bubble in oil electric discharge,
Bubble electric discharge, the electric discharge of metal suspension particle, metal tip electric discharge, suspended conductor electric discharge etc. in solid.So detection power transformer
Device shelf depreciation is it can be found that the insulation defect of its internal early stage, and by timely fault diagnosis and state evaluation, to take
Specific treatment measures, avoid its development.
The superfrequency detection method of intrusive mood is suitable for Partial Discharge in Power Transformer live detection and on-line monitoring, is to protect
Hinder power transformer equipment safety reliability service effective ways.Extra-high video sensor is important member in partial discharge detecting system
Part, its detection sensitivity determines that the safety and stability of detecting system confidence level and power transformer is horizontal, and detection sensor
Height equivlent then be even more superfrequency sensor performance important indicator.
Partial-discharge ultrahigh-frequency signal substantially belongs to pulse electromagnetic wave signal, and sensor internal exploring antenna substantially belongs to
Electric field type antenna, what can be sensed is the electric field component of electromagnetic wave.It is the key element for measuring shelf depreciation electromagnetic wave signal.For
Antenna can illustrate the ability of its transmitting or reception electromagnetic wave with effective length.Effective length is setting equivalent aerial and reality
Under conditions of field strength of the border antenna in given radiation direction is equal, equally distributed electric current is equal to actual antennas on equivalent aerial
During certain upper reference current, the length of equivalent aerial is known as actual antennas in direction reduction in the effective long of reference current at this time
Degree.
Partial-discharge ultrahigh-frequency sensor is based on coupler principle, couples transient pulse electromagnetism caused by shelf depreciation
Ripple, and exported after being translated into voltage signal.It is extra-high to keep pouring in in the incident electric fields environment of Partial Discharge in Power Transformer
The level of sensor exploring antenna output signal is bigger, is that antenna coupled electromagnetic wave signal capabilities are stronger, that is to say that sensor is put down
Equal effective height is higher.In conclusion sensor effective height reflects the size of the receiving ability of antenna, it is that characterization electric power becomes
The key index of the extra-high video sensor measurement performance of depressor.Further, since shelf depreciation electromagnetic wave signal limited duration, this
To being an impediment to examine extra-high video sensor effective height；And partial-discharge ultrahigh-frequency sensor engineer application effect can be caused not
It is good, or even false alarm occur, fail to report alert phenomenon.The situation, which has hindered, effectively applies Partial Discharge Detecting Technology, so
Each power grid enterprises have set about studying and using related check technologies, if CHINA SOUTHERN POWER company is in 13 ＂ equipment states of ＂
Monitoring and evaluation center promotes programme of work（(2016) No. 23 texts of south electric network equipment）In be distinctly claimed in build shelf depreciation survey
The detection platform of test instrument, and carry out device performance test job.
In consideration of it, being necessary to develop, the detection circuit using set of extra-high video sensor effective height, product control is examined special
The key technical index such as the average effective height of high frequency sensors.
The content of the invention
To solve the above-mentioned problems, it is effectively high to provide a kind of extra-high video sensor of partial discharge of transformer for the utility model
The inspection circuit of degree, concrete technical scheme are as follows：
A kind of inspection circuit of the extra-high video sensor effective height of partial discharge of transformer includes pulse signal source, electromagnetic wave
Cell, oscillograph, Measurement ＆control computer, reference antenna, tested extra-high video sensor；The pulse signal source is small with electromagnetic wave respectively
Room is connected with Measurement ＆control computer, the oscillograph respectively with pulse signal source, Measurement ＆control computer, reference antenna and tested extra-high
Video sensor connects, and exploration hole is set at the top of the electromagnetic wave cell；The exploration hole is located at the top of gtem cell close to terminal
In the region of 1/4-1/2；The reference antenna and tested extra-high video sensor are placed at the exploration hole of electromagnetic wave cell.
Further, the voltage signal magnitude of the pulse signal source output is no more than 200 volts, and output impedance is 50 Europe
Nurse；The voltage waveform of output is Double exponential pulse waveform.
Further, the frequency range of the electromagnetic wave cell is no more than 2.2 girz, and input impedance is 50 ohm, standing wave
Coefficient is less than 1.5.
Further, the analog bandwidth of the oscillograph is no more than 4 girz, and it is per second that sampling rate is no more than 25 girz.
Further, the reference antenna uses monopole probes, the monopole probes receive the frequency range of signal for 0.3 to
3 girz.
Further, the radius of the monopole probes is 1 to 1.5 millimeter, is highly 20 to 30 millimeters.
The utility model broken away from can not product control examine extra-high video sensor effective height predicament, help to improve increasing
Power equipment product control quality, the general level of the health and service efficiency are measured, realizes that the synthesis of risk, efficiency and cost is optimal.
Brief description of the drawings
Fig. 1 is the structure diagram of the utility model；
Fig. 2 is the structure diagram of the pulse signal source of the utility model.
Embodiment
In order to be better understood from the utility model, the utility model is made with specific embodiment below in conjunction with the accompanying drawings further
Explanation：
As shown in Figure 1, a kind of inspection circuit of the extra-high video sensor effective height of partial discharge of transformer is believed including pulse
Number source, electromagnetic wave cell, oscillograph, Measurement ＆control computer, reference antenna, be tested extra-high video sensor；Set at the top of electromagnetic wave cell
Put exploration hole；Reference antenna and tested extra-high video sensor are placed at the exploration hole of electromagnetic wave cell；Exploration hole is located at GTEM
Close to the place of terminal 1/3 at the top of cell, a diameter of 220 millimeters of exploration hole, field strength is the most uniform herein.
Pulse signal source is connected with Measurement ＆control computer, the output frequency and amplitude in Measurement ＆control computer control wave source,
Pulse signal source is connected with electromagnetic wave cell so that pulse signal source is to electromagnetic wave cell injected pulse signal, in electromagnetic wave cell
Middle formation electromagnetic field.
Oscillograph has 6 road signal transmission passages, and the first via signal transmission channel of oscillograph passes through coaxial cable and ginseng
Examine antenna connection, the signal that is detected so as to oscilloscope display reference antenna at exploration hole and by the signal transmission to observing and controlling meter
Calculation machine analyzes and processes, and the second road signal transmission channel of oscillograph is connected by coaxial cable with being tested extra-high video sensor, with
Just oscilloscope display is tested the signal that extra-high video sensor detects at exploration hole, and by the signal transmission to Measurement ＆control computer
Analyzing and processing, the 3rd road signal transmission passage of oscillograph are connected connection with pulse signal source by coaxial cable, in order to provide
Lock-out pulse, the 4th road signal transmission passage of oscillograph are connected by coaxial cable with Measurement ＆control computer so that synchronism output is examined
The signal measured.
The voltage signal magnitude of pulse signal source output is no more than 200 volts, and it is 0.2 volt to adjust step-length, output impedance
For 50 ohm；The voltage waveform of output is Double exponential pulse waveform.
As shown in Fig. 2, pulse signal source includes AC/DC converting units, programmable logic controller (PLC) unit, add circuit list
Member, ac high-voltage generation circuit unit, current rectifying and wave filtering circuit unit, shaping circuit unit, CMOS output interface units, AC/DC
Converting unit is connected with Measurement ＆control computer, add circuit unit respectively；Programmable logic controller (PLC) unit is calculated with observing and controlling respectively
Machine, the connection of add circuit unit, add circuit unit are connected with ac high-voltage generation circuit unit, shaping circuit unit respectively,
Shaping circuit unit is connected with CMOS output interface units, and CMOS output interface units are connected with oscillograph；Ac high-voltage produces
Circuit unit is connected with current rectifying and wave filtering circuit, and current rectifying and wave filtering circuit unit is connected with electromagnetic wave cell；Programmable logic controller (PLC)
Receive, perform the instruction of Measurement ＆control computer, and control the work of a whole set of pulse signal source, such as control AC/DC converting units, add
Method circuit unit realizes that outer synchronous and amplitude adjusting, control are realized and produce rectangular pulse signal etc., and Measurement ＆control computer passes through
PLC controls pulse signal source produces rectangular pulse signal；Add operation is carried out by add circuit unit,
And with one signal with same period of OPA603 electric current amplifiers synchronism output, realize and export lasting outer lock-out pulse letter
Number；Ac high-voltage generation circuit is based on NE555 multi-resonants oscillator and 3DK35E photoelectrical couplers are realized and control outer lock-out pulse
Signal level rises, modulates and exports；Pulse letter of the current rectifying and wave filtering circuit unit based on SG1524 pulse-modulator output smoothings
Number to electromagnetic wave cell, original outer synchronization pulse is shaped as without trembling by shaping circuit unit based on 74HC132 triggers
Dynamic steady-state signal, and for tester's observation, the pulse of adjusting output after CMOS output interface units are exported to oscillograph
Signal.
The frequency range of electromagnetic wave cell is no more than 2.2 girz, and input impedance is 50 ohm, and standing-wave ratio is less than 1.5,
Close to 1.The analog bandwidth of oscillograph is no more than 4 girz, and it is per second that sampling rate is no more than 25 girz.Reference antenna uses
Monopole probes, the frequency range that monopole probes receive signal is 0.3 to 3 girz.The radius of monopole probes is 1.3 millimeters, high
Spend for 25 millimeters.
During work, pulse signal source is controlled and adjusted by Measurement ＆control computer to the pulse signal that electromagnetic wave cell exports,
And required pulse electromagnetic field is established in electromagnetic wave cell, the reference antenna at exploration hole detects and to receive electromagnetic wave small
The characteristic information of office work frequency band and electric field, and by the signal transmission detected to oscillograph, pass through oscillograph
The signals such as corresponding pulse number, voltage responsive signal UMr, electric discharge amplitude, frequency are obtained, and measured signal is transmitted to observing and controlling
Computer carries out calculating analysis with being tested the voltage responsive signal UMs of extra-high video sensor, judges superfrequency according to analysis result
Whether the effective height technical indicator of sensor reaches the index of engineering design and meets the requirement of field application.
The laboratory ambient temperature of the utility model is 15 to 35 degrees Celsius, and relative humidity is 25% to 75%, atmospheric pressure
It is 86 to 106 kPas.
The operation principle of the utility model is further described below：
（1）Pulse signal source is connected with electromagnetic wave cell, Measurement ＆control computer respectively, by pulse signal source to electromagnetic wave
Chamber input voltage amplitude is 20 volts of calibration pulse signal, and it is lucky to establish covering 0.3 to 1.5 in electromagnetic wave chamber
Simulation partial discharge pulse electromagnetic field in the range of hertz band；
（2）Reference antenna is placed at the exploration hole of electromagnetic wave cell, and reference antenna is connected with oscillograph, will shown
Ripple device is connected with Measurement ＆control computer, pulse signal source respectively, and reference antenna at this time is obtained by oscillograph and Measurement ＆control computer
Voltage responsive signal Umr；
（3）Tested extra-high video sensor is placed at the exploration hole of electromagnetic wave cell, and extra-high video sensor will be tested
It is connected with oscillograph, is tested the voltage responsive signal Ums of extra-high video sensor at this time by oscillograph and Measurement ＆control computer；
（4）Using the effective height Href of known reference antenna, then be tested the effective height Hsens of extra-high video sensor=
(UMs/UMr) × Href calculates the effective height of tested antenna；
（5）The output frequency of pulse signal source is adjusted in the frequency range of 0.3 to 1.5 girz, obtains different frequency
The effective height curve of extra-high video sensor is tested down, and then obtains being tested the average effective height of extra-high video sensor；
（6）Inspection technology index, by analytical control as a result, judging whether the effective height for being tested extra-high video sensor is full
The requirement of sufficient technical specification, and write product control and examine record.
The utility model is not limited to above-described embodiment, and the foregoing is merely the preferable of the utility model
Case study on implementation, is not intended to limit the utility model, and that is made where within the spirit and principles of the present invention is any
Modifications, equivalent substitutions and improvements etc., should be included within the scope of protection of this utility model.
Claims (6)
- A kind of 1. inspection circuit of the extra-high video sensor effective height of partial discharge of transformer, it is characterised in that：Believe including pulse Number source, electromagnetic wave cell, oscillograph, Measurement ＆control computer, reference antenna, be tested extra-high video sensor；The pulse signal source point Be not connected with electromagnetic wave cell and Measurement ＆control computer, the oscillograph respectively with pulse signal source, Measurement ＆control computer, reference antenna And tested extra-high video sensor connection, the electromagnetic wave cell top set exploration hole；The exploration hole is located at gtem cell Top is in the region of terminal 1/4-1/2；The reference antenna and tested extra-high video sensor are placed on electromagnetic wave cell At exploration hole.
- 2. a kind of inspection circuit of the extra-high video sensor effective height of partial discharge of transformer according to claim 1, its It is characterized in that：The voltage signal magnitude of the pulse signal source output is no more than 200 volts, and output impedance is 50 ohm；Output Voltage waveform be Double exponential pulse waveform.
- 3. a kind of inspection circuit of the extra-high video sensor effective height of partial discharge of transformer according to claim 1, its It is characterized in that：The frequency range of the electromagnetic wave cell is no more than 2.2 girz, and input impedance is 50 ohm, and standing-wave ratio is small In 1.5.
- 4. a kind of inspection circuit of the extra-high video sensor effective height of partial discharge of transformer according to claim 1, its It is characterized in that：The analog bandwidth of the oscillograph is no more than 4 girz, and it is per second that sampling rate is no more than 25 girz.
- 5. a kind of inspection circuit of the extra-high video sensor effective height of partial discharge of transformer according to claim 1, its It is characterized in that：The reference antenna uses monopole probes, and the frequency range that the monopole probes receive signal is 0.3 to 3 gigahertz (GHZ) Hereby.
- 6. a kind of inspection circuit of the extra-high video sensor effective height of partial discharge of transformer according to claim 5, its It is characterized in that：The radius of the monopole probes is 1 to 1.5 millimeter, is highly 20 to 30 millimeters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721048378.4U CN207232368U (en) | 2017-08-21 | 2017-08-21 | A kind of inspection circuit of the extra-high video sensor effective height of partial discharge of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721048378.4U CN207232368U (en) | 2017-08-21 | 2017-08-21 | A kind of inspection circuit of the extra-high video sensor effective height of partial discharge of transformer |
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| CN201721048378.4U Active CN207232368U (en) | 2017-08-21 | 2017-08-21 | A kind of inspection circuit of the extra-high video sensor effective height of partial discharge of transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109298368A (en) * | 2018-11-24 | 2019-02-01 | 国网山东省电力公司电力科学研究院 | A kind of partial-discharge ultrahigh-frequency sensor height equivlent compensation measuring system and method |
| CN110531298A (en) * | 2019-09-26 | 2019-12-03 | 国网电力科学研究院武汉南瑞有限责任公司 | Ultra high-frequency partial discharge sensor performance improvement detection method and system |
-
2017
- 2017-08-21 CN CN201721048378.4U patent/CN207232368U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109298368A (en) * | 2018-11-24 | 2019-02-01 | 国网山东省电力公司电力科学研究院 | A kind of partial-discharge ultrahigh-frequency sensor height equivlent compensation measuring system and method |
| CN109298368B (en) * | 2018-11-24 | 2020-09-04 | 国网山东省电力公司电力科学研究院 | Equivalent height compensation measurement system and method for partial discharge ultrahigh frequency sensor |
| CN110531298A (en) * | 2019-09-26 | 2019-12-03 | 国网电力科学研究院武汉南瑞有限责任公司 | Ultra high-frequency partial discharge sensor performance improvement detection method and system |
| CN110531298B (en) * | 2019-09-26 | 2021-10-08 | 国网电力科学研究院武汉南瑞有限责任公司 | Detection method and system for performance improvement of ultrahigh frequency partial discharge sensor |
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