CN208953649U - A kind of high pressure oilpaper frequency domain measurement instrument based on Spectral Analysis Method - Google Patents
A kind of high pressure oilpaper frequency domain measurement instrument based on Spectral Analysis Method Download PDFInfo
- Publication number
- CN208953649U CN208953649U CN201821560431.3U CN201821560431U CN208953649U CN 208953649 U CN208953649 U CN 208953649U CN 201821560431 U CN201821560431 U CN 201821560431U CN 208953649 U CN208953649 U CN 208953649U
- Authority
- CN
- China
- Prior art keywords
- feet
- controller
- chip
- resistance
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000005259 measurement Methods 0.000 title claims abstract description 22
- 238000010183 spectrum analysis Methods 0.000 title claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 11
- 239000000523 sample Substances 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 5
- 230000006870 function Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 abstract description 35
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000004817 gas chromatography Methods 0.000 abstract description 3
- 238000009659 non-destructive testing Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 31
- 230000032683 aging Effects 0.000 description 17
- 230000010287 polarization Effects 0.000 description 14
- 230000008569 process Effects 0.000 description 10
- 239000003921 oil Substances 0.000 description 9
- 239000000047 product Substances 0.000 description 9
- 230000005684 electric field Effects 0.000 description 7
- 230000004044 response Effects 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 230000000875 corresponding effect Effects 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000028161 membrane depolarization Effects 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- 239000000123 paper Substances 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000003989 dielectric material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005316 response function Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 240000005561 Musa balbisiana Species 0.000 description 1
- 235000018290 Musa x paradisiaca Nutrition 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000003708 edge detection Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000001453 impedance spectrum Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model provides a kind of high pressure oilpaper frequency domain measurement instrument based on Spectral Analysis Method, including data processing module, data transmission module, data memory module, temperature detecting module, voltage acquisition module and alternating voltage output module, frequency conversion alternating voltage is applied outside the utility model, its virtual value is fixed as 200V, far below the working voltage of high voltage electric equipment.Therefore, which will not damage the insulation of tested electrical equipment, compared to traditional the methods of gas-chromatography, without coring, hang cover, i.e., will not damage to original insulation, can be truly realized non-destructive testing.
Description
Technical field
The utility model relates to a kind of high pressure oilpaper frequency domain measurement instrument based on Spectral Analysis Method.
Background technique
Power grid scale constantly expands, and has ten hundreds of electrical equipments now and comes into operation, these electrical equipments it is exhausted
Edge intensity is the key that guarantee that can power grid safe and reliable operation.Nowadays, there is substantial portion of electrical equipment using oilpaper
The insulation system of insulation detects these reliability of structures by instant, convenient means, device for the reliable fortune of power grid
Row is particularly significant.
Currently, traditional Insulation monitoring mode has: the detection of insulation resistance, the detection of dielectric loss angle tangent, part are put
Electro-detection, the detection means of non-electric parameter have oil colours gas phase analysis.These traditional approach are very mature, practical in current engineering
In have been widely used.But since there are variety of problems, such as: suspended core is needed, cover is taken inherently and can damage the behaviour of insulation system
Make, and vulnerable to the influence of external noise interference.Domestic and foreign scholars propose, the Insulation monitoring means based on dielectric response method.
Electrical analysis is carried out to insulation system by establishing Debye model.
Frequency domain analysis is method known to most widely used and numerous researchers in dielectric spectrum field,
Principle is measured sample as capacitor, is obtained its polarization response under AC field excitation, can be passed through difference
The dot frequency or frequency sweep of driving frequency measure.To obtain between complex dielectric permittivity and dielectric loss angle and measurement frequency
Functional relation.Dielectric response information in addition to obtaining dielectric under single-frequency, can also be by transformer insulated medium
Both ends apply the ac-excited voltage of various frequencies to obtain more state of insulation information.This method can calculate different frequencies
Rate isolation material dielectric loss reason, complex capacitance and complex dielectric constant, above-mentioned data have closely with transformer insulated situation
Association, is assessed so as to the ageing state to insulation system.Since polarization current, depolarization current due to applying polarization outside
Voltage is several hectovolts, will not be damaged to the insulation of several hundred kilovolts of high voltage electric equipment easily.
Utility model content
It is lossless the technical problem to be solved by the utility model is to provide a kind of based on Spectral Analysis Method, electrically set
The measurement instrument of standby Insulation monitoring.The instrument can not take cover, suspended core, destroy on the basis of former insulation system and realize nothing
The Insulation monitoring of damage, using the supplement as detection methods such as traditional oily gas-chromatographies, to judge the insulation degree of equipment.
The utility model provides a kind of high pressure oilpaper frequency domain measurement instrument based on Spectral Analysis Method, including at data
It manages module, data transmission module, data memory module, temperature detecting module, voltage acquisition module and alternating voltage and exports mould
Block.
Data processing module is made of controller U1 (DP8421A) and clock signal pio chip U4 (74LS161), control
56 feet of device U1 connect U4；
Data transmission module is made of USB data transmission chip J1 (AT43301), resistance R1-R6, data memory module by
Storage chip U3 (M68AW031AL_SO28), resistance R7, resistance R8 are constituted, 36 foot phases of 1 foot and controller U1 of chip J1
Even, 4, the 7 feet ground connection of chip J1,3 feet of chip J1 are connected by R1 with 15 feet of chip U3, and 2 feet of chip J1 pass through resistance
R2 is connected with 13 feet of chip U3, and 5 feet of chip J1 are connected by R4 with 66 feet of controller U1, and 6 feet of chip J1 pass through electricity
Resistance R3 is connected with 4 feet of controller U1, and 9 feet of chip J1 are connected by resistance R5 with 65 feet of controller U1,8 feet of chip J1
It is connected by resistance R6 with 64 feet of controller U1, the shell of chip J1 is connected with the USB line of extraneous engineering machine；Chip U3's
16 feet are connected by resistance R7 with 8 feet of controller U1, and 17 feet of chip U3 are connected by resistance R8 with 9 feet of controller U1；
Temperature detecting module is made of temperature sensor U7A (WRNK-187), and 1 foot of temperature sensor U7A is through resistance R9
It is connect with 41 feet of controller U1,2 feet of temperature sensor U7A are connect through resistance R10 with 40 feet of controller U1, temperature sensing
4 feet of device U7A are connect through resistance R11 with 39 feet of controller U1, and 5 feet of temperature sensor U7A are through resistance R12 and controller U1
The connection of 38 feet, 6 feet of temperature sensor U7A are connected with the temp probe in the external world, to obtain temperature information.
Alternating voltage output module carries out control output, control unit U2 by control unit U2 (MP3221) and voltage source V1
1 foot connect with 63 feet of controller U1,3 feet of control unit U2 are connected with 62 feet of controller U1,2 feet of control unit U2
Output control alternating source.
Voltage acquisition module is made of control unit U5 (TI-BQ76PL455A-Q), control unit U6A (4001BD),
In, 1 foot of control unit U6A (4001BD) is connected with 45 feet of controller U1, and 2 feet of control unit U6A are with controller U1's
44 feet are connected, and 3 feet of control unit U6A are connected with control unit U5, the CH1 interface outside the output termination of control unit U5.
48,50 feet of controller U1 are connected with indicator light X1, and wherein 50 feet of controller U1 are connected to capacitor C1, play examination
Test the instruction function of state.
Spectral Analysis Method is based on multiple capacitor theory.Spectral Analysis Method is that a kind of lossless, frequency domain dielectric response is exhausted
Edge detection method is the emphasis of current domestic and foreign scholars' research.Specific method is to apply the alternation that an angular frequency is ω to test product
Electric field, main operational principle are the alternating voltages for controlling voltage source offer different frequency by multi-functional cable by industrial personal computer, and
It is applied on product to be tested, while the voltmeter by being arranged in termination box and ammeter measurement are applied on test product at this time
Voltage and resulting electric current, and the two corresponding data are passed back industrial personal computer by multi-functional cable, by installation
The calculating of software in industrial personal computer obtains a series of numerical value such as Dielectric loss tangent tan δ, sample telegram in reply appearance.
In the alternation external electric field that angular frequency is ω, dielectric complex dielectric permittivity composes ε (ω)=ε ' (ω)-j ε " (ω).
It is regarded as caused by various Polarization Mechanisms.When applying electric field E (t) at the both ends of dielectric substance, can occur in material
Polarization process, dielectric displacement amount D (t) are positively correlated with E (t), and the ratio of the two is ε0, the dielectric constant in vacuum is represented, respectively
Potential shift to same sex dielectric substance includes the polarization of material, and there are following relationships between them:
D (t)=ε0E(t)+P(t) (1)
In formula, t indicates to apply electric field duration on the dielectric material.
Dielectric response function f (t) indicates the excitation and polarity effect of electric field, the impulse response of dielectric material:
And
In field strength E (t) in each mode, dielectric response equation can pass through convolution with being associated between polarity effect P (t)
Mode is described:
In t0When, field strength E (t) can be attached in dielectric object, will occur what available conductive and displacement current indicated
Current density j (t):
In formula: σ0For the conductivity of dielectric material, S/m.
In frequency domain, polarizability χ (ω) is the Fourier transformation of dielectric response function:
In formula, χ (ω) is polarizability, Cm2/V。
Then the polarization P (ω) under frequency domain may be expressed as:
P (ω)=ε0χ(ω)E(ω) (6)
Current density in time domain is subjected to Fourier transformation, is obtained:
J (ω)=σ0E(ω)+iωD(ω) (7)
In conjunction with time domain dielectric displacement expression formula and frequency domain polarizability expression formula, obtain:
J (ω)={ σ0+iωε0[1+ χ ' (ω)-i χ " (ω)] } E (ω)={ σ0+ωε0χ”(ω)+iωε0[1+χ'
(ω)]}E(ω) (8)
Definition
D (ω)=ε0εr(ω) E (ω)=ε0[1+χ'(ω)-iχ”(ω)]E(ω) (9)
Then relative dielectric constant εrAre as follows:
εr(ω)=εr'(ω)-iεr" (ω)=1+ χ ' (ω)-i χ " (ω) (10)
Then Dielectric loss tangent tan δ tan δ may be expressed as:
The utility model solves its technical problem by following technical solution: a kind of high pressure oilpaper based on Spectral Analysis Method
Frequency domain measurement method, steps are as follows:
S1) data acquire: the alternating voltage by applying frequency variation to tested electrical equipment, the real part that record telegram in reply holds
With imaginary part, and Dielectric loss tangent tan δ is recorded on engineering machine；
S2) data processing: frequency and Dielectric loss tangent tan δ and dielectric displacement amount D (t) are handled, using quick Fu
In leaf algorithm it is converted, obtain Dielectric loss tangent curve and telegram in reply hold real part, imaginary part curve,
S3 real part, imaginary part curve) multilevel iudge: are held with the dielectric loss tangent curve of equipment under test original state and telegram in reply
As standard curve；Step S1 and S2 are repeated when overhaul of the equipments, resulting dielectric loss tangent curve, telegram in reply hold real part and imaginary part
Curve is test curve, by test curve compared with standard curve, with the state of insulation of this comparison equipment under test, if tested song
Line is lower than standard curve, then state of insulation is impaired, and equipment should be overhauled to be occurred with accident prevention.
It is f (ω) with standard curve, test curve is g (ω), is judged according to the following formula
lg[f(ω0)/g(ω0)]=σ (12)
State of insulation is good if σ≤2.23528,
State of insulation is poor if σ >=5.23434, should overhaul immediately.
ω is taken in formula0For 1000Hz.
Above-mentioned standard curve, should be different according to the model of equipment, and corresponding dielectric loss is obtained when just putting into operation
Tangent cutve and telegram in reply hold real part, imaginary part curve, using as standard curve.
Standard curve acquisition process is as follows: to the electrical equipment newly put into, after handover experiment terminates and qualification puts into operation,
Carry out the test of frequency domain node test.Voltage source is controlled by multi-functional cable, the alternating voltage of different frequency is provided, and be applied to
On product to be tested, at the same the voltage that is applied on test product at this time by the voltmeter that is arranged in termination box and ammeter measurement and
Resulting electric current, and the two corresponding data are passed back industrial personal computer by multi-functional cable, by calculating, obtain one
The numerical value such as serial dielectric loss angle tan δ, sample telegram in reply appearance, are depicted as curve record on engineering machine.
Test curve acquisition process is as follows: during operating maintenance afterwards, carrying out the frequency domain dielectric to electrical equipment
Test process, resulting test is compared with standard curve, in comparison procedure, if dielectric loss tangent cutve and telegram in reply hold in fact
Portion, imaginary part curve are much higher than reference curve, then should overhaul immediately, to avoid heavy losses.
Compared to existing Insulation monitoring technology, the utility model has the following beneficial effects:
1) the outer of the utility model applies frequency conversion alternating voltage, and virtual value is fixed as 200V, is far below high voltage electric equipment
Working voltage.Therefore, which will not damage the insulation of tested electrical equipment, compared to the side such as traditional gas-chromatography
Method without coring, hangs cover, i.e., will not damage to original insulation, can be truly realized non-destructive testing；
2) efficiency of overhaul of the equipments is greatly accelerated in 10 to 15 minutes the time required to the method single, needs 3 original
It was greatly shortened to 4 hours work repair times.Simultaneously as applying outside, frequency-changing AC piezoelectric voltage is not high, the requirement for equipment
It just without excessively high, while also ensuring the safety of operator, reduces the probability that accident occurs；
3) the dielectric insulation detection method relative to the polarization depolarization current method based on time domain, this instrument are based on frequency domain,
That is Spectral Analysis Method, as the supplement of time domain insulation detecting method, this law compensates for polarization depolarization current method not well
Foot can allow the staff at scene more accurately to judge the insulation situation of electrical equipment.
Detailed description of the invention
Fig. 1 is the module map of high pressure oilpaper frequency domain measurement instrument.
Fig. 2 is the circuit diagram of high pressure oilpaper frequency domain measurement instrument.
Fig. 3 is the Wiring port schematic diagram of high pressure oilpaper frequency domain measurement instrument.
Fig. 4 is certain transformer resulting dielectric loss tangent curve at the standard conditions；
Fig. 5 is the influence of dielectric loss angle tangent curve under condition of different temperatures；
Fig. 6 is that telegram in reply holds real part change curve under condition of different temperatures；
Fig. 7 is that telegram in reply holds imaginary part change curve under condition of different temperatures；
Fig. 8 is the change curve of the dielectric loss angle tangent of different degree of aging paper oil insulation samples；
Fig. 9 is that the telegram in reply of different degree of aging paper oil insulation samples holds real part change curve；
Figure 10 is that the telegram in reply of different degree of aging paper oil insulation samples holds imaginary part change curve；
Specific embodiment
The utility model is further described with reference to the accompanying drawing.
As depicted in figs. 1 and 2, the high pressure oilpaper frequency domain measurement instrument based on Spectral Analysis Method, including data processing mould
Block, data transmission module, data memory module, temperature detecting module, voltage acquisition module and alternating voltage output module.
Data processing module is made of controller U1 (DP8421A) and clock signal pio chip U4 (74LS161), control
56 feet of device U1 connect U4；
Data transmission module is made of USB data transmission chip J1 (AT43301), resistance R1-R6, data memory module by
Storage chip U3 (M68AW031AL_SO28), resistance R7, resistance R8 are constituted, 36 foot phases of 1 foot and controller U1 of chip J1
Even, 4, the 7 feet ground connection of chip J1,3 feet of chip J1 are connected by R1 with 15 feet of chip U3, and 2 feet of chip J1 pass through resistance
R2 is connected with 13 feet of chip U3, and 5 feet of chip J1 are connected by R4 with 66 feet of controller U1, and 6 feet of chip J1 pass through electricity
Resistance R3 is connected with 4 feet of controller U1, and 9 feet of chip J1 are connected by resistance R5 with 65 feet of controller U1,8 feet of chip J1
It is connected by resistance R6 with 64 feet of controller U1, the shell of chip J1 is connected with the USB line of extraneous engineering machine；Chip U3's
16 feet are connected by resistance R7 with 8 feet of controller U1, and 17 feet of chip U3 are connected by resistance R8 with 9 feet of controller U1；
Temperature detecting module is made of temperature sensor U7A (WRNK-187), and 1 foot of temperature sensor U7A is through resistance R9
It is connect with 41 feet of controller U1,2 feet of temperature sensor U7A are connect through resistance R10 with 40 feet of controller U1, temperature sensing
4 feet of device U7A are connect through resistance R11 with 39 feet of controller U1, and 5 feet of temperature sensor U7A are through resistance R12 and controller U1
The connection of 38 feet, 6 feet of temperature sensor U7A are connected with the temp probe in the external world, to obtain temperature information.
Alternating voltage output module carries out control output, control unit U2 by control unit U2 (MP3221) and voltage source V1
1 foot connect with 63 feet of controller U1,3 feet of control unit U2 are connected with 62 feet of controller U1,2 feet of control unit U2
Output control alternating source.
Voltage acquisition module is made of control unit U5 (TI-BQ76PL455A-Q), control unit U6A (4001BD),
In, 1 foot of control unit U6A (4001BD) is connected with 45 feet of controller U1, and 2 feet of control unit U6A are with controller U1's
44 feet are connected, and 3 feet of control unit U6A are connected with control unit U5, the CH1 interface outside the output termination of control unit U5.
48,50 feet of controller U1 are connected with indicator light X1, and wherein 50 feet of controller U1 are connected to capacitor C1, play examination
Test the instruction function of state.
Wherein data processing module is completed by controller U1 (DP8421A), realizes the number to polarization current, depolarization current
According to acquisition and processing.Data memory module is made of U3 (M68AW031AL_SO28).Data transmission module is by USB hub
(AT43301) it carries out transmitting the data of external USB mouth.Temperature detecting module selects U7A (WRNK-187) temperature sensor.It will
The temp probe of sensor is placed in below the power supply indicator of instrument front panel, carries out the temperature measurement of experimental situation, and is passed to
Engineering machine carries out data record.
Power supply VCC, VDD 5V.The value of resistance capacitance is respectively R1:10k Ω, R2:3k Ω, R3:5k Ω, R4:3k
Ω、 R5:3kΩ、R6:11kΩ、R7:1kΩ、R8:15kΩ、R9:12kΩ、R10:15kΩ、R11:7kΩ、R12:11.7k
Ω、C1:50pF)
High pressure oilpaper frequency domain measurement instrument set there are three input port (including two signal input parts of CH1, CH2
Mouth and the outside GND grounding ports), a power supply indicator POWER, an output to engineering machine port USB.Wherein use
P-wire (6m/20ft, 2.5mm with banana plug2) and the extension three that is used in order to avoid equipment under test electromagnetic pollution
Shaft cable (18m/60ft, 50 Ω) so carries out signal input.The earth cable of earth cable selection Band clamp.With engineering machine
Connection selection USB 2.0A/B line (1.8m).It is normal operating conditions when the bright orange green light of power supply indicator POWER, red is goes out
Existing malfunction.
High pressure oilpaper frequency domain measurement instrument can carry out in the following manner using.Electrical overhaul is carried out on substation and other places
When, by using three-core cable connection CH1 (CH2) and electrical equipment to be measured, using earth cable connection GND with transformer
Measurement instrument is connected by tank envelope with USB line with engineering PC machine.So apply frequency conversion voltage, sample frequency is by U1's
The frequency of 61,62 foot control BUCK-BOOST Transformer output voltages, from 0.1mHz~104Hz starts variation acquisition.
A kind of high pressure oilpaper frequency domain measurement instrument based on Spectral Analysis Method, step are as follows:
S1) data acquire: the alternating voltage by applying frequency variation to tested electrical equipment, the real part that record telegram in reply holds
With imaginary part, and Dielectric loss tangent tan δ is recorded on engineering machine；
S2) data processing: frequency and Dielectric loss tangent tan δ and dielectric displacement amount D (t) are handled, using quick Fu
In leaf algorithm it is converted, obtain Dielectric loss tangent curve and telegram in reply hold real part, imaginary part curve,
S3 real part, imaginary part curve) multilevel iudge: are held with the dielectric loss tangent curve of equipment under test original state and telegram in reply
As standard curve；Step S1 and S2 are repeated when overhaul of the equipments, resulting dielectric loss tangent curve, telegram in reply hold real part and imaginary part
Curve is test curve, by test curve compared with standard curve, with the state of insulation of this comparison equipment under test, if tested song
Line is lower than standard curve, then state of insulation is impaired, and equipment should be overhauled to be occurred with accident prevention.
It is f (ω) with standard curve, test curve is g (ω), is judged according to the following formula
lg[f(ω0)/g(ω0)]=σ
State of insulation is good if σ≤2.23528,
State of insulation is poor if σ >=5.23434, should overhaul immediately.
ω is taken in formula0For 1000Hz.
Above-mentioned standard curve, should be different according to the model of equipment, and corresponding dielectric loss is obtained when just putting into operation
Tangent cutve and telegram in reply hold real part, imaginary part curve, using as standard curve.It is additional when just putting into operation such as Fig. 4 for certain transformer
The resulting dielectric loss angle tangent electricity curve of alternating electric field and telegram in reply of 200V frequency variation hold real part, imaginary part curve.
Standard curve acquisition process is as follows: to the electrical equipment newly put into, after handover experiment terminates and qualification puts into operation,
Carry out the test of frequency domain node test.Voltage source is controlled by multi-functional cable, the alternating voltage of different frequency is provided, and be applied to
On product to be tested, at the same the voltage that is applied on test product at this time by the voltmeter that is arranged in termination box and ammeter measurement and
Resulting electric current, and the two corresponding data are passed back industrial personal computer by multi-functional cable, by calculating, obtain one
The numerical value such as serial dielectric loss angle tan δ, sample telegram in reply appearance, are depicted as curve record on engineering machine.
Test curve acquisition process is as follows: during operating maintenance afterwards, carrying out the frequency domain dielectric to electrical equipment
Test process, resulting test is compared with standard curve, in comparison procedure, if dielectric loss tangent cutve and telegram in reply hold in fact
Portion, imaginary part curve are much higher than reference curve, then should overhaul immediately, to avoid heavy losses.
The following are the test processes and result of certain simulated experiment.
As Fig. 5~Fig. 7 be temperature to the dielectric loss angle tangent curve of high pressure paper oil insulation sample and telegram in reply hold real part,
The influence of imaginary part change curve.
As shown in figure 5, the affecting laws that temperature holds the affecting laws that telegram in reply holds with moisture content to telegram in reply have many phases
Like place, telegram in reply holds real part 10-3~1Hz frequency range can increase with the rising of temperature, and 1~103Hz frequency range, temperature become
The influence changed to it is very faint；In full frequency band, imaginary part increases along with temperature and increase trend occurs；10-3~1Hz model
Inside is enclosed, dielectric loss increases as the temperature increases, and hardly happens variation in remaining frequency range.Temperature emulates FDS
The main reason for influence, is embodied in the following:
1) raising of temperature can cause the speed of hydrone and other conducting particles to increase, particle migration and conductivity indices
Increasing trend will be presented, furthermore equilibrium transfer speed also will increase, and polarity effect is caused gradually to strengthen；
2) strengthen ion warm-up movement state, furthermore the polarized state of improving clamping interlayer also increases in the fixed cycle and occurs
Probability；
3) it as temperature increases, is reduced the time required to establishing the polarization of interface interlayer, interfacial polarization intensity further increases.
Dielectric loss and telegram in reply to the difference aging 0 day, 10 days and 31 days of paper oil insulation sample, which hold, carries out simulation analysis, this
Secondary experiment replaces Heat Ageing using quick heat ageing, excludes external condition interference as far as possible under ideal conditions.It is hot old
The specific test procedure changed are as follows: new Wei Deman (Weidmann) insulating board and carat Ma with a thickness of 1.5mm of selection first
According to No. 25 mineral transformer oils are produced, cardboard is cut into the disk that several diameters are 180mm, and (all disks are cut out by same cardboard
Out, so that each disk material and thickness are consistent)；Then, vacuum dried cardboard is soaked in the vacuum of about 70Pa
Oil is put into cardboard insulated article in 1000mL glass flask, and No. 25 mineral transformer oils that 700mL is added seal again, set
Enter the high temperature constant temperature chamber that accuracy of temperature control is ± 1 DEG C and carries out acceleration heat ageing at 140 DEG C；It is in ageing time respectively
250h and 400h takes out cardboard test product, and number is respectively A1 and A2, and the new cardboard test product number without aging is A0.To A0 group into
Row aforesaid operations are only placed in 25 DEG C of constant temperature and are sealed without insulating box.Similarly, for A1 and A2 in heat ageing processing
Afterwards, it is placed on being sealed 5h under 25 DEG C of environment.That is, A0 is completely new oilpaper, A1 and A2 are equivalent to aging 31 days and after 50 days
Oilpaper.
Time domain polarization depolarization current curve matlab is iterated to calculate to obtain six branch parameters, to carry out frequency domain
Dielectric response analysis.Its dielectric and magnetic is as shown in Fig. 8~Figure 10.10-3~10-1In Hz range, real part will be along with frequency
The reduction occurred more by a small margin is increased, 10-3Within the scope of~10Hz, imaginary part will occur more bright along with frequency up to increasing
Aobvious reduction, but appearance real and imaginary parts of sending a telegram in reply hardly happen variation in remaining frequency range, this is because when electric field frequency is higher,
Dielectric polarization process is not easily formed.Pass through the FDS curve of observation analysis difference ageing state, it is to be understood that degree of aging and multiple
Relationship between capacitor real and imaginary parts: with the increase of degree of aging, telegram in reply appearance real part is increased more uniformly in full frequency band,
And it sends a telegram in reply and holds imaginary part only 10-3~10-1Hz frequency range has more apparent variation with the variation of degree of aging, 10-1~
103Without significant changes in Hz band limits, dielectric loss is as the increase of degree of aging is 10-3~10-1Hz frequency range slightly increases
Add.
By being tested above it is found that dielectric loss tangent curve and telegram in reply hold real part, imaginary part curve can be used for judging equipment
Dielectric properties, and when carrying out insulative dielectric test, it should detect temperature, and collection voltages frequency.
Above disclosed is only a kind of preferred embodiment of the utility model, certainly cannot be practical to limit with this
Novel interest field, those skilled in the art can understand all or part of the processes for realizing the above embodiment, and according to
Equivalent variations made by the utility model claims, still falls within the scope of the utility model.
Claims (4)
1. a kind of high pressure oilpaper frequency domain measurement instrument based on Spectral Analysis Method, it is characterized in that: including data processing module, number
According to transmission module, data memory module, temperature detecting module, voltage acquisition module and alternating voltage output module；
Data processing module is made of controller U1 and clock signal pio chip U4, and 56 feet of controller U1 connect U4；
Data transmission module is made of USB data transmission chip J1, resistance R1-R6, and data memory module is by storage chip U3, electricity
It hinders R7, resistance R8 to constitute, 1 foot of chip J1 is connected with 36 feet of controller U1,4, the 7 feet ground connection of chip J1,3 feet of chip J1
It is connected by R1 with 15 feet of chip U3,2 feet of chip J1 are connected by resistance R2 with 13 feet of chip U3,5 feet of chip J1
It is connected by R4 with 66 feet of controller U1,6 feet of chip J1 are connected by resistance R3 with 4 feet of controller U1, and the 9 of chip J1
Foot is connected by resistance R5 with 65 feet of controller U1, and 8 feet of chip J1 are connected by resistance R6 with 64 feet of controller U1, core
The shell of piece J1 is connected with the USB line of extraneous engineering machine；16 feet of chip U3 are connected by resistance R7 with 8 feet of controller U1,
17 feet of chip U3 are connected by resistance R8 with 9 feet of controller U1；
Temperature detecting module is made of temperature sensor U7A, and 1 foot of temperature sensor U7A is through the 41 of resistance R9 and controller U1
Foot connection, 2 feet of temperature sensor U7A are connect through resistance R10 with 40 feet of controller U1, and 4 feet of temperature sensor U7A are through electricity
Resistance R11 is connect with 39 feet of controller U1, and 5 feet of temperature sensor U7A are connect through resistance R12 with 38 feet of controller U1, temperature
6 feet for spending sensor U7A are connected with extraneous temp probe, to obtain temperature information；
Alternating voltage output module carries out control output by control pressure regulation unit U2 and voltage source V1,1 foot of control unit U2 with
63 feet of controller U1 connect, and 3 feet of control unit U2 are connected with 62 feet of controller U1, and 2 feet of control unit U2 export control
Alternating source processed；
Voltage acquisition module is made of voltage acquisition unit U5, control unit U6A, wherein 1 foot of control unit U6A and control
45 feet of device U1 are connected, and 2 feet of control unit U6A are connected with 44 feet of controller U1, and 3 feet of control unit U6A and control are single
First U5 is connected, the CH1 interface outside the output termination of control unit U5.
2. the high pressure oilpaper frequency domain measurement instrument according to claim 1 based on Spectral Analysis Method, it is characterized in that: control
48,50 feet of device U1 are connected with indicator light X1, and wherein 50 feet of controller U1 are connected to capacitor C1, play the instruction of trystate
Function.
3. the high pressure oilpaper frequency domain measurement instrument based on Spectral Analysis Method according to claim 1, it is characterized in that: controller
The model DP8421A of U1, the model 74LS161 of clock signal pio chip U4, the model of USB data transmission chip J1
The model WRNK-187 of the model M68AW031AL_SO28 of AT43301, storage chip U3, temperature sensor U7A.
4. the high pressure oilpaper frequency domain measurement instrument based on Spectral Analysis Method according to claim 1, it is characterized in that: control is adjusted
Press the model MP3221 of unit U2, the model TI-BQ76PL455A-Q of voltage acquisition unit U5, the type of control unit U6A
Number be 4001BD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821560431.3U CN208953649U (en) | 2018-09-25 | 2018-09-25 | A kind of high pressure oilpaper frequency domain measurement instrument based on Spectral Analysis Method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821560431.3U CN208953649U (en) | 2018-09-25 | 2018-09-25 | A kind of high pressure oilpaper frequency domain measurement instrument based on Spectral Analysis Method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208953649U true CN208953649U (en) | 2019-06-07 |
Family
ID=66739096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821560431.3U Active CN208953649U (en) | 2018-09-25 | 2018-09-25 | A kind of high pressure oilpaper frequency domain measurement instrument based on Spectral Analysis Method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208953649U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108896894A (en) * | 2018-09-25 | 2018-11-27 | 国网江西省电力有限公司南昌供电分公司 | A kind of high pressure oilpaper frequency domain measurement instrument and test method based on Spectral Analysis Method |
-
2018
- 2018-09-25 CN CN201821560431.3U patent/CN208953649U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108896894A (en) * | 2018-09-25 | 2018-11-27 | 国网江西省电力有限公司南昌供电分公司 | A kind of high pressure oilpaper frequency domain measurement instrument and test method based on Spectral Analysis Method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108896894A (en) | A kind of high pressure oilpaper frequency domain measurement instrument and test method based on Spectral Analysis Method | |
| CN103149452B (en) | Method for evaluating ageing state of paper oil insulation | |
| CN103105568B (en) | Aging and the local discharge integrated experimental provision of transformer oil paper insulated electrothermic associating | |
| CN106855605B (en) | Frequency domain test analysis system and method for evaluating overall aging life of cable | |
| CN103091611B (en) | Oiled paper insulation power equipment insulation aging state detecting method | |
| CN103954847A (en) | Testing device for oiled paper compound insulation frequency domain dielectric spectrum and conductivity test | |
| Urbani et al. | Using the recovery voltage method to evaluate aging in oil-paper insulation | |
| CN103308835A (en) | Method and device for detecting insulation aging state of oil-paper insulation electric power equipment | |
| CN105548732A (en) | System and method of measuring space charge characteristics in insulated material under short-time temperature rise | |
| CN103954896A (en) | Oiled paper insulation partial discharge inception voltage test system | |
| CN106054037A (en) | Electrical tree observation device with heating and partial discharge monitoring functions | |
| CN109358251A (en) | A kind of MOA arrester electrification synchronous measuring apparatus, testing instrument for electrified and charged test method | |
| CN103105566A (en) | Oil paper insulation electrical equipment aging state detection method based on universal relaxation law | |
| CN105116201B (en) | The measuring device and measuring method of return voltage parameter | |
| CN105866644A (en) | System for automatically collecting transformer oil paper insulation return voltage and testing method | |
| CN109142995B (en) | Oil paper insulation dielectric tester and method based on dielectric response method | |
| CN208953649U (en) | A kind of high pressure oilpaper frequency domain measurement instrument based on Spectral Analysis Method | |
| CN108459250A (en) | Shelf depreciation reaction signal detecting system under a kind of surge voltage | |
| CN107290399B (en) | Transformer water content measuring device based on PDC/FDS medium response method | |
| CN208568969U (en) | Paper oil insulation measurement instrument and synchronous measuring apparatus based on dielectric response method | |
| CN104101787A (en) | Portable low-voltage reactive compensation standard detection system and detection method | |
| CN106680351A (en) | On-line dynamic measurement device used for micro-water content in insulation oil paper | |
| CN111665285A (en) | Evaluation method of carbon fiber electrode performance for ocean electromagnetic method | |
| CN206235593U (en) | A kind of on-line dynamic measurement device for micro-water content in empire paper | |
| Joshi et al. | Dielectric diagnosis of EHV current transformer using frequency domain spectroscopy (FDS) & polarization and depolarization current (PDC) techniques |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |