CN207232366U - A kind of transformer high-frequency test instrument sensitivity and the inspection circuit of the linearity - Google Patents
A kind of transformer high-frequency test instrument sensitivity and the inspection circuit of the linearity Download PDFInfo
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- CN207232366U CN207232366U CN201721047911.5U CN201721047911U CN207232366U CN 207232366 U CN207232366 U CN 207232366U CN 201721047911 U CN201721047911 U CN 201721047911U CN 207232366 U CN207232366 U CN 207232366U
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Abstract
The utility model belongs to status of electric power detection and fault diagnosis technology field, more particularly to a kind of transformer high-frequency test instrument sensitivity and the inspection circuit of the linearity, steep-sided pulse signal generator, injection capacitance, high frequency sensors, tested high-frequency test instrument are specifically included；The steep-sided pulse signal generator is connected in series with injection capacitance, high frequency sensors, and the output terminal for being tested high-frequency test instrument and high frequency sensors connects.The utility model creatively by steep-sided pulse signal generator injected pulse signal and by high-frequency test instrument detect its response of high frequency sensors and realize detection the sensitivity of high-frequency test instrument and the linearity purpose, the problem for being difficult to examine shelf depreciation high-frequency test instrument key technical index has thoroughly been captured, has promoted the lean management for improving Transformer's Condition Monitoring equipment quality horizontal.
Description
Technical field
The utility model belongs to status of electric power detection and fault diagnosis technology field, and in particular to a kind of transformer is high
The sensitivity of frequency test equipment and the inspection circuit of the linearity.
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.
Shelf depreciation process can produce steep-sided pulse, gaseous products, ultrasonic wave, electromagnetic radiation, light, hot-spot and energy
, therefore, there is pulse current method, gas chromatography, ultrasonic Detection Method, Electromagnetic Wave Detection method, light detection in loss etc.
A variety of detection methods such as method.Pulse current method is to obtain effective detection partial discharge of transformer side of International Electrotechnical Commission's accreditation
One of method.This method detects bottom shielding of bushing ground wire, earthing of casing line, iron core grounding line by detecting impedance, and then grasps
The pulse current situation caused by shelf depreciation, the characteristic parameter of detection include Apparent discharge magnitude, discharge time, discharge phase
Deng.But existing it is based on pulse current method（High frequency）The quality of tester is uneven, and there are sensitivity and the linearity not to reach
The situation of engineer application basic demand.Wherein, sensitivity refers to that tester detects local discharge signal in the case of steady operation
The ratio that output quantity change changes input quantity, and the linearity refers to tester output quantity with input quantity to be kept by ideal situation
Proportionate relationship（Linear relationship）Actual metrics curve.It can be seen that the sensitivity of instrument for measuring partial discharge and the linearity determine detection
The field application of instrument is horizontal and leakage alarm whether occurs during transformer belt electro-detection or alerts by mistake.The situation is
The application effect of Partial Discharge Detecting Technology is restricted, so product control monitoring device and detecting instrument have been set about by each power grid enterprises
Sensitivity, the linearity, if CHINA SOUTHERN POWER company is in 13 ＂ equipment condition monitorings assessment centers of ＂ propulsion programme of work（South
Square (2016) No. 23 texts of grid equipment）In be distinctly claimed in the detection platform for building instrument for measuring partial discharge's device, and carry out device
Performance test works.
In consideration of it, it is necessary to develop, using set of high frequency partial discharge tester sensitivity and the inspection of linearity electricity
Road, product control examine whether the key technical index of high frequency partial discharge tester reaches the requirement of technical specification.
The content of the invention
To solve the above-mentioned problems, the utility model provides a kind of transformer high-frequency test instrument sensitivity and the linearity
Inspection circuit, concrete technical scheme is as follows：
The inspection circuit of a kind of transformer high-frequency test instrument sensitivity and the linearity includes steep-sided pulse signal generator, note
Enter capacitance, high frequency sensors, tested high-frequency test instrument；The steep-sided pulse signal generator and injection capacitance, high frequency sensors
It is connected in series, the output terminal for being tested high-frequency test instrument and high frequency sensors connects.
Further, the signal output cable of the steep-sided pulse signal generator is connected in series with injection capacitance；The signal
Output cable punching accesses high frequency sensors.
Further, the steep-sided pulse signal generator is using 81110 serial pulse signal generators.
Further, the injection capacitance is the ceramic condenser that capacity is 100 pico farads.
Further, the high frequency sensors are the hollow circular High Frequency Current Sensors based on Rogowski coil.
The utility model provides the inspection circuit of a kind of transformer high-frequency test instrument sensitivity and the linearity.Its technology
Advantage is：1）Creatively detection high-frequency test instrument sensitivity is realized by detecting the response condition of high frequency sensors
And the purpose of the linearity, the problem for being difficult to examine shelf depreciation high-frequency test instrument key technical index has thoroughly been captured, has been promoted
The lean management for improving Transformer's Condition Monitoring equipment quality is horizontal.2）Guarantee shelf depreciation high frequency measuring instrument is successfully built
The product control verifying bench of device, has effectively prevented and has carried out the Transformer's Condition Monitoring time-frequency unfavorable phenomenon that now alarm, leakage alert by mistake,
The synthesis for having reached risk, efficiency and cost at one stroke is optimal.
Brief description of the drawings
Fig. 1 is the structure diagram of the utility model；
Wherein, 1- steep-sided pulses signal generator, 2- injection capacitances, 3- high frequency sensors, 4- are tested high-frequency test instrument.
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 transformer high-frequency test instrument sensitivity and the linearity include steep-sided pulse signal generator 1,
Inject capacitance 2, high frequency sensors 3, tested high-frequency test instrument 4；The signal output cable of steep-sided pulse signal generator 1 and injection
Capacitance 2 is connected in series, and signal output cable punching access high frequency sensors 3, are tested high-frequency test instrument 4 and high frequency sensors 3
Output terminal connection.
For steep-sided pulse signal generator 1 using the pulse signal generator of 81110 series, its reference frequency output is 100,000
Hertz is to 120 megahertzs, and output impedance is 50 ohm, and die-away time was not less than for 200 nanoseconds, and rising edge of a pulse was not more than for 5 nanoseconds.
Injection capacitance is the ceramic condenser that capacity is 100 pico farads.High frequency sensors are the hollow circular high frequency electrics based on Rogowski coil
Sensor.
The laboratory ambient temperature of the utility model is 15 to 35 degrees Celsius, and relative humidity is 25% to 75%, atmospheric pressure
Power is 86 to 106 kPas.
The operation principle of the utility model is described further below：
（1）The signal output cable connection of steep-sided pulse signal generator 1 is injected into capacitance 2 and passes through high frequency sensors 3；Quilt
3 signal output part of the signal transmission passage access high frequency sensors of high-frequency test instrument 4 is surveyed, and acquisition pulse electric current is believed
Number；
（2）Examining the process of sensitivity is：1 voltage pulse output signal of steep-sided pulse signal generator, pass through injection
Capacitance 2Pulse current is produced in circuit is examined afterwards, simulation apparent charge amount isLocal discharge signal, whereinAnd surveyed pulsed current signal is shown by tested high-frequency test instrument 4.Basis for estimation is to work asFor 50
During skin storehouse, being tested high-frequency test instrument 4 should be with not less than 2:1 signal-to-noise ratio shows local discharge signal, and signal-to-noise ratio and quilt
It is proportional to survey the sensitivity of high-frequency test instrument 4, and signal-to-noise ratio is higher, the sensitivity for being tested high-frequency test instrument 4 is higher.It is described
Signal-to-noise ratio for local discharge signal amplitude and pulse voltage signal amplitude ratio；
（3）Examining the process of the linearity is：The ascending pulse voltage signal for adjusting steep-sided pulse signal generator 1 and producingOutput voltage amplitude, by injecting capacitance 2Pulse current is produced in circuit is examined afterwards, simulates apparent charge amount
ForLocal discharge signal, record apparent charge amountWhen changing from 50 to 5000 skin storehouses, 4 institute of high-frequency test instrument is tested
The output voltage amplitude of the local discharge signal detected,
If the output voltage amplitude of the local discharge signal shown by tested high-frequency test instrument 4 is linear graduation value,
Such as the linearity error of tested high-frequency test instrument 4 is then calculated as follows in units of millivolt in output voltage amplitude：
；
If the output voltage amplitude of the local discharge signal shown by tested high-frequency test instrument 4 is logarithmic scale value,
Such as the linearity error of tested high-frequency test instrument 4 is then calculated as follows in units of dB in output voltage amplitude：
；
（4）When the steep-sided pulse signal for applying constant amplitude, frequencyWhen, judge the tested high-frequency test instrument 4 recorded
Transient response value says whether the sensitivity of statement, linearity error are consistent with bid response material or product description, and then
Judge whether test equipment is qualified.Such as most I surveys partial discharge quantity and is not more than 30 skin storehouses, when the dynamic of local discharge signal
When scope reaches 40dB, the linear degree error of institute is not more than 10%.
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 (5)
1. a kind of transformer high-frequency test instrument sensitivity and the inspection circuit of the linearity, it is characterised in that：Believe including steep-sided pulse
Number generator, injection capacitance, high frequency sensors, tested high-frequency test instrument；The steep-sided pulse signal generator with injection capacitance,
High frequency sensors are connected in series, and the output terminal for being tested high-frequency test instrument and high frequency sensors connects.
2. a kind of transformer high-frequency test instrument sensitivity according to claim 1 and the inspection circuit of the linearity, it is special
Sign is：The signal output cable of the steep-sided pulse signal generator is connected in series with injection capacitance；The signal output cable
Punching accesses high frequency sensors.
3. a kind of transformer high-frequency test instrument sensitivity according to claim 1 and the inspection circuit of the linearity, it is special
Sign is：The steep-sided pulse signal generator is using 81110 serial pulse signal generators.
4. a kind of transformer high-frequency test instrument sensitivity according to claim 1 and the inspection circuit of the linearity, it is special
Sign is：The injection capacitance is the ceramic condenser that capacity is 100 pico farads.
5. a kind of transformer high-frequency test instrument sensitivity according to claim 1 and the inspection circuit of the linearity, it is special
Sign is：The high frequency sensors are the hollow circular High Frequency Current Sensors based on Rogowski coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721047911.5U CN207232366U (en) | 2017-08-21 | 2017-08-21 | A kind of transformer high-frequency test instrument sensitivity and the inspection circuit of the linearity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721047911.5U CN207232366U (en) | 2017-08-21 | 2017-08-21 | A kind of transformer high-frequency test instrument sensitivity and the inspection circuit of the linearity |
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| Publication Number | Publication Date |
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| CN207232366U true CN207232366U (en) | 2018-04-13 |
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| CN201721047911.5U Active CN207232366U (en) | 2017-08-21 | 2017-08-21 | A kind of transformer high-frequency test instrument sensitivity and the inspection circuit of the linearity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112305324A (en) * | 2020-10-28 | 2021-02-02 | 中国人民解放军军事科学院防化研究院 | Measuring method and sensor for high-frequency pulse electric field |
| CN113311291A (en) * | 2021-05-28 | 2021-08-27 | 国网江苏省电力有限公司无锡供电分公司 | Partial discharge detection sensitivity testing device and method for long-section high-voltage cable |
-
2017
- 2017-08-21 CN CN201721047911.5U patent/CN207232366U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112305324A (en) * | 2020-10-28 | 2021-02-02 | 中国人民解放军军事科学院防化研究院 | Measuring method and sensor for high-frequency pulse electric field |
| CN112305324B (en) * | 2020-10-28 | 2023-10-20 | 中国人民解放军军事科学院防化研究院 | Measurement method of high-frequency pulse electric field and sensor |
| CN113311291A (en) * | 2021-05-28 | 2021-08-27 | 国网江苏省电力有限公司无锡供电分公司 | Partial discharge detection sensitivity testing device and method for long-section high-voltage cable |
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