CN110057816A - The appraisal procedure of insulating materials senile experiment device based on electro thermal coupling field - Google Patents
The appraisal procedure of insulating materials senile experiment device based on electro thermal coupling field Download PDFInfo
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- CN110057816A CN110057816A CN201910211597.7A CN201910211597A CN110057816A CN 110057816 A CN110057816 A CN 110057816A CN 201910211597 A CN201910211597 A CN 201910211597A CN 110057816 A CN110057816 A CN 110057816A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/20—Preparation of articles or specimens to facilitate testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N2021/8472—Investigation of composite materials
Abstract
The present invention discloses a kind of appraisal procedure of insulating materials senile experiment device based on electro thermal coupling field, high voltage DC power cable is effectively assessed with insulating materials state of insulation using the method for tree length, includes the following steps: that step 1) prepares the EP rubbers test sample based on needle to board electrode；Step 2) is tested using electro thermal coupling field test device；Step 3) observes electrical tree aging process situation inside sample under electric branch observation device；Step 4) is calculated using the virtual ruler of ScreenRuler.Experimental temperature is controllable and accurate, effectively simulates the actual operating mode of actual motion mesohigh insulation DC electric cable.
Description
Technical field
The invention belongs to high-tension apparatus field, in particular to a kind of insulating materials senile experiment dress based on electro thermal coupling field
The appraisal procedure set.
Background technique
It is also higher and higher to power transmission requirement with the fast development of power industry industry and the expansion of power grid scale,
Cable is widely used in the transmission and distribution networks such as urban network reconstruction, submarine cable power transmission.In recent years, EP rubbers
Due to its excellent mechanical performance and electric property, and it is widely used in prefabricated type cable accessory as interior insulation material.
However the structure of cable accessory is sufficiently complex, during insulating materials preparation or cable accessory extrusion moulding inevitably
The defects of being mixed into impurity, forming air gap, bubble and burr.National grid to the statistical result showed of cable system failure cause,
The factor that external force is destroyed is excluded, 70% cable system failure is derived from the decline of cable accessory dielectric level.Therefore, cable is improved
The insulating reliability of attachment is for ensureing that cable system safe operation is of crucial importance.
Currently, electrical tree aging process has become an important factor for influencing cable accessory insulating reliability.Cable accessory is in life
Producing under the action of the defect introduced in manufacture and transport installation process applies electric field outside can cause internal field to concentrate, and easily cause
It ionizes and polymer is caused to decompose, gradually develop and grow dendritic discharge channel to insulating layer depths along direction of an electric field,
Eventually lead to the complete or incomplete breakdown of polymer.
Flexible DC transmission with Traditional DC transmission of electricity compared to many advantages, be highly suitable for renewable energy it is grid-connected,
The fields such as distributed generation grid-connected, island power supply, urban distribution network power supply and Asynchronous Communication Power System Interconnection, and flexible DC transmission system
Switch element in system causes to generate a large amount of pulse voltage in system, this allows for direct current cables and is bearing voltage rating, behaviour
While making overvoltage, Lightning Over-voltage, it is also subjected to the impact of a large amount of repetition pulse voltages.Therefore, the presence of pulse voltage
Whether will affect state of insulation and insulation ag(e)ing is accelerated to become urgent problem to be solved in direct current cables technology.
Under declared working condition, cross-inked polyethylene power cable and its attachment longtime running under 70 DEG C or so of environment temperature,
When cable overload, running temperature can achieve about 90 DEG C, and when short trouble occurs for cable, running temperature can be high
Up to 250 DEG C；When cable institute on-load increases and decreases, the environment of an alternating temperature can be generated, so that insulating materials work exists
More under rugged environment.Therefore, under the conditions of research temperature change and under pulse voltage effect, the ageing state of insulating materials
Appraisal procedure has very important significance.
Summary of the invention
It is an object of the invention to overcome problems of the prior art, a kind of insulation based on electro thermal coupling field is provided
The appraisal procedure of material aging experimental provision provides DC stacked harmonic voltage assessment under electric branch observation device and low temperature environment
Method, so as to use the method for measurement tree length to high-temperature superconductor DC voltage cable insulating materials degree of aging
Effectively assessed.
The appraisal procedure of insulating materials senile experiment device based on electro thermal coupling field, using the method pair of tree length
High voltage DC power cable is effectively assessed with insulating materials state of insulation, is included the following steps:
Step 1) prepares the EP rubbers test sample based on needle to board electrode, and sample preparation of the present invention is using based on needle-plate
The electrical tree aging process sample 2 of electrode system, pin electrode 15 connect high voltage, and ground electrode 7 is grounded, and sample is placed on plate electrode.For
It is clearer to observe that electric branch image, sample are fixed between two panels transparent glass sheet.
Preparation for EP rubbers test sample, should be according to following procedure.The first step first weighs 40gEPDM particle, makes
EPDM particle is sufficiently melted with twin-roll machine, twin-roll machine temperature is set as 170 DEG C, and revolving speed is 25 circle per minute, in room temperature condition
Lower melting carries out blend sulfurized crosslinking 3 minutes, EPDM and bis 25 vulcanizing agent quality point using bis 25 vulcanizing agent after ten minutes
Number ratio is 100:1；Second step after being blended uniformly, uses tabletting machine 10 minutes under the conditions of 170 DEG C, pressure 24MPa
Afterwards, it is cooling to take out sample room temperature；Sample is cut into 40mm × 20mm × 4mm coupon using cutter by third step；4th
Step, sticks with a thickness of 100 μm of copper foil electrodes in sample bottom, just reaches electrical tree aging process requirement of experiment.Finally prepare
Sample is as shown in Figure 1.
Step 2) is tested using electro thermal coupling field test device, and electric branch experimental system setup is as shown in Figure 2.This reality
Experiment device can simulate a variety of different actual conditions, and for different actual conditions, experimental implementation is different, separately below
It introduces:
The first operating condition, as shown in Fig. 4-(a), to the cable of dry run at different temperatures；The first step places second
Third rubbery sample: after first checking that electric branch experimental system setup is normal, start to connect sample pin electrode and electric branch experimental system
Device high-voltage end；Second step sets target temperature in temperature controller, the temperature sensor real-time measurement being made of thermocouple
The temperature inside the box guarantees that insulating box internal temperature reaches requirement of experiment by temperature control system, when temperature reaches set temperature
When, then 5min is waited to reach target temperature with the temperature for guaranteeing material；Third step carries out pressurization experiment: opening the pulse power
While start timing；4th step takes out sample: after specified pressing time, closing power supply and takes out sample, be statically placed in room temperature ring
Border 20min, preparation are observed under electric branch observation device.
Second of operating condition, as shown in Fig. 4-(b), to simulate after power cable short circuit, short circuit current is generated huge
Cable operating temperature change dramatically caused by big fuel factor；The first step places EP rubbers sample: first checking electric branch experiment system
After bulk cargo is set normally, start to connect sample pin electrode and electric branch experimental system setup high-voltage end；Second step, in temperature controller
Middle setting target temperature, the temperature sensor real-time measurement the temperature inside the box being made of thermocouple, is guaranteed by temperature control system
Insulating box internal temperature reaches requirement of experiment, when temperature reaches set temperature, then waits 5min to guarantee the temperature of material
Degree reaches target temperature；Third step carries out pressurization experiment: starting timing while opening the pulse power, when arrival setting time
Afterwards, the pulse power is closed；4th step sets another temperature (Fig. 4-(b) broken line latter half), by thermoelectricity in temperature controller
The temperature sensor real-time measurement the temperature inside the box occasionally formed guarantees that insulating box internal temperature reaches experiment by temperature control system
It is required that when temperature reaches set temperature, then 5min is waited to reach target temperature with the temperature for guaranteeing material；5th step,
Repressurization: start timing while opening the pulse power；6th step takes out sample: after specified pressing time, closing power supply
Sample is taken out, room temperature environment 20min is statically placed in, preparation is observed under electric branch observation device.
The third operating condition, as shown in Fig. 4-(c), to the temporary of running temperature variation caused by the increase and decrease of dummycable load
State temperature-rise period；The first step places EP rubbers sample: after first checking that electric branch experimental system setup is normal, starting connection examination
Sample pin electrode and electric branch experimental system setup high-voltage end；Second step sets target temperature in temperature controller, by thermocouple
Temperature sensor real-time measurement the temperature inside the box of composition guarantees that insulating box internal temperature reaches experiment and wants by temperature control system
It asks；The pulse power is opened while starting heating device；Third step takes out sample: after reaching setting target temperature, closing electricity
Sample is taken out in source, is statically placed in room temperature environment 20min, and preparation is observed under electric branch observation device.
4th kind of operating condition, as shown in Fig. 4-(d), in the case where having starting electric branch in dummycable, load
Transient state temperature-rise period caused by increase and decrease influences the aging of subsequent insulating materials；The first step is placed EP rubbers sample: first being examined
Look into electric branch experimental system setup it is normal after, start to connect sample pin electrode and electric branch experimental system setup high-voltage end；Second
Step, sets target temperature, the temperature sensor real-time measurement the temperature inside the box being made of thermocouple passes through temperature in temperature controller
Degree control system guarantees that insulating box internal temperature reaches requirement of experiment, when temperature reaches set temperature, then waits 5min
To guarantee that the temperature of material reaches target temperature；Third step carries out pressurization experiment: start timing while opening the pulse power,
After reaching setting time, the pulse power is closed；4th step sets new target temperature, by thermocouple in temperature controller
Temperature sensor real-time measurement the temperature inside the box of composition guarantees that insulating box internal temperature reaches experiment and wants by temperature control system
It asks；The pulse power is opened while starting heating device；5th step takes out sample: after reaching setting target temperature, closing electricity
Sample is taken out in source, is statically placed in room temperature environment 20min, and preparation is observed under electric branch observation device.
Step 3) observes electrical tree aging process situation inside sample, electric branch observation device structure under electric branch observation device
Such as Fig. 3.The first step places sample, debugs optical microscopy and CCD digital camera head.Optical microscopy of the invention is selected high
Multiplying power monotubular videomicroscopy, CCD digital camera head select 1X, and eyepiece multiple is 10X, electric branch image can be amplified 40 and arrived
400 times.Sample is placed on sheet glass, adjusting sample position is until can see that needle point.Cold light source position is adjusted, cold light is made
The light direct beam sample needle point that source issues, clearly to observe the internal situation of EP rubbers sample；Second step observes sample.It will
CCD digital camera head is connected with terminal, and the form of electric branch inside sample is observed by video software camera video recording great master, and
It photographs to record.It can start to assess insulation ag(e)ing through row using the method for tree length using the image of record.According to
Experiment discovery, it can be seen that the degree of aging of insulating materials is different under different condition under conditions of application voltage time is the same
Sample, therefore experimental result can mention for assessment EP rubbers insulation ag(e)ing degree under different temperature environments in Practical Project
For effectively instructing.The first step opens the picture of video software camera video recording great master's shooting；Second step operates virtual ruler,
At 0 scale of pin electrode tip align virtual ruler；Third step, operate virtual ruler removable graticule to electric branch extend it is farthest
End, reads the tree length that virtual ruler is shown；4th step, tree length is corresponding with the 300um length of calibration virtual
Ruler length is converted, and obtains the physical length of final electric branch.
Step 4) is calculated using the virtual ruler of ScreenRuler:
(1) picture of video software camera video recording great master's shooting is opened；
(2) virtual ruler is operated, at 0 scale of pin electrode tip align virtual ruler；
(3) distalmost end that the removable graticule of virtual ruler extends to electric branch is operated, the electric branch that virtual ruler is shown is read
Length；
(4) tree length virtual ruler length corresponding with the 300um length of calibration is converted, obtains final electricity tree
The physical length of branch, as shown in Figure 5.It can be seen that the picture of video software camera video recording great master's shooting can clearly be told
Electric branch pattern, ScreenRuler linear measure longimetry platform can accurately measure tree length.Therefore in different temperatures
Under environment, obvious using tree length characterization insulation ag(e)ing degree effect, the method for the results show tree length can
To become, the present invention is based on the appraisal procedures of the insulating materials aging of electro thermal coupling field.
Beneficial effect
1, needle to board electrode system simulates inevitable defect inside EP rubbers cable accessory.
2, present apparatus experimental temperature is controllable and accurate.
3, the actual operating mode of actual motion mesohigh insulation DC electric cable is effectively simulated.
Detailed description of the invention
Fig. 1 is experiment of the invention needle to board electrode system specimen figure.
Fig. 2 is the electric branch experimental system setup structure chart under the conditions of electro thermal coupling of the invention.
Fig. 3 is electric branch observation device structure chart of the invention.
Fig. 4 is some temperature change conditions that the present apparatus can be simulated:
It (a) can be with dummycable longtime running in certain stationary temperature environment；
(b) can be with dummycable under the conditions of suddenly-applied short circuit, the change dramatically situation of running temperature；
(c) during load increase and decrease can be simulated, the transient state temperature-rise period of running temperature variation；
(d) there can be initial electric branch with analog insulation material, load increase and decrease then occurs again leads to temperature change, to insulation
The influence of the subsequent electrical tree aging process of material.
Fig. 5 is the typical electrical branch form under condition of different temperatures:
(a) under conditions of 30 DEG C, pressurize 10min；
(b) under conditions of 60 DEG C, pressurize 10min；
(c) under conditions of 90 DEG C, pressurize 10min；
(d) under the conditions of 30 DEG C of -90 DEG C of persistently overheatings, pressurize 5min；
(e) under the conditions of 30 DEG C, pressurize 5min；
(f) under the conditions of 90 DEG C, pressurize 5min；
(g) under 2min30s-90 DEG C of pressurization 5min stable state temperature match curing conditions of 30 DEG C of pressurizations, pressurize 7min30s altogether；
(h) under the conditions of 30 DEG C, pressurize 7min30s；
(i) under the conditions of 90 DEG C, pressurize 7min30s.
Fig. 6 is to analyze result to the insulating materials electrical tree aging process under different temperatures using screenruler analysis platform
Example (respectively corresponds Fig. 5-(a), (b), (c)).
Fig. 7 is the device of the invention block diagram.
Appended drawing reference:
1- terminal, electric branch sample of the 2- based on needle plate electrode system, 3- cold light source, 4- optical microscopy, 5-CCD are digital
Camera, 6- low-tension bushing, 7- ground electrode, 8- transparency glass plate, 9- temperature sensor, 10- temperature controller, 11- heating dress
It sets, 12- insulating box, 13- current-limiting resistance, 14- bushing, 15- pin electrode.
Specific embodiment
Specific example is provided with reference to the accompanying drawing, further illustrates that the insulating materials of the invention based on electro thermal coupling field is old
Change test device and how method is realized.
As shown in fig. 7, the present invention provide it is a kind of based on the insulating materials ageing tester of electro thermal coupling field mainly by reality
Experiment device, electric branch observation device, Pulased power supply unit and terminal 1 are constituted, and are provided with ScreenRuler long in the terminal 1
Measuring table, sample delta data in experimental provision described in the electric branch observation device observational record are spent, and data are transmitted
To terminal 1, ScreenRuler linear measure longimetry platform carries out tree length measurement in the terminal 1.
As shown in Fig. 2, the experimental provision is to manufacture different temperature environments, including insulating box 12, temperature sensor
9, temperature controller 10 and heating device 11 are provided with the electric branch sample 2 based on needle plate electrode system in the insulating box 12,
The electric branch sample 2 prepares electric branch sample using EP rubbers sample mould；The electricity tree based on needle to board electrode system
Branch 2 top of sample connects the pulse power voltage device by bushing 14 and current-limiting resistance 13, described based on needle-plate electricity
2 bottom of electric branch sample of electrode systems is grounded by low-tension bushing 6；The different temperatures environment is by temperature controller 10, temperature
Sensor 9 and heating device 11 manufacture, and the temperature controller 10 connects the heating device 11 by control circuit, described
Temperature sensor 9 is provided at the top of insulating box 12, the temperature sensor 9 is made of thermocouple, and the temperature sensor 9 is to believe
Number line connects the temperature controller 10, and the temperature controller 10 controls the heating power of the heating device 11；
As shown in figure 3, the electric branch observation device is mainly by optical microscopy (SDK-2000) 4, CCD digital camera head
5, cold light source 3 is constituted；The CCD digital camera head 5 is connected with the terminal 1, and by video software camera, video recording great master is seen
Inside test specimens electric branch whether generation, amplification factor selects 1X, and highest resolution is 1024pixels × 768pixels,
Three object lens multiples are respectively 4X, 10X, 40X, and eyepiece multiple is 10X；
The cold light source 3 is clearly to observe EP rubbers sample internal situation；
As shown in Fig. 2, the pulse voltage device is made of an impulse voltage generator；
ScreenRuler linear measure longimetry platform is operate in the software analysis platform in the terminal 1, is a kind of measurement screen
The virtual ruler of curtain, can arbitrarily adjust length, scale, transparency, and the destruction of polymer is described by measurement tree length
Degree.ScreenRuler linear measure longimetry platform operating procedure are as follows: the first step opens the video software camera video recording great master
The picture of shooting；Second step operates virtual ruler, at 0 scale of pin electrode tip align virtual ruler；Third step operates virtual ruler
The distalmost end that extends to electric branch of removable graticule, read the tree length that virtual ruler is shown；4th step is long by electric branch
It spends virtual ruler length corresponding with the 300um length of calibration to be converted, obtains the physical length of final electric branch.
The appraisal procedure of insulating materials ageing tester based on electro thermal coupling field, using the method pair of tree length
High voltage direct current cable is effectively assessed with insulating materials state of insulation, is included the following steps:
Step 1) prepares the EP rubbers test sample based on needle to board electrode, and sample preparation of the present invention is using based on needle-plate
The electrical tree aging process sample 2 of electrode system, pin electrode 15 connect high voltage, and ground electrode 7 is grounded, and sample is placed on plate electrode.For
It is clearer to observe that electric branch image, sample are fixed between two panels transparent glass sheet.
Preparation for EP rubbers test sample, should be according to following procedure.The first step first weighs 40gEPDM particle, makes
EPDM particle is sufficiently melted with twin-roll machine, twin-roll machine temperature is set as 170 DEG C, and revolving speed is 25 circle per minute, in room temperature condition
Lower melting carries out blend sulfurized crosslinking 3 minutes, EPDM and bis 25 vulcanizing agent quality point using bis 25 vulcanizing agent after ten minutes
Number ratio is 100:1；Second step after being blended uniformly, uses tabletting machine 10 minutes under the conditions of 170 DEG C, pressure 24MPa
Afterwards, it is cooling to take out sample room temperature；Sample is cut into 40mm × 20mm × 4mm coupon using cutter by third step；4th
Step, sticks with a thickness of 100 μm of copper foil electrodes in sample bottom, just reaches electrical tree aging process requirement of experiment.Finally prepare
Sample is as shown in Figure 1.
Step 2) is tested using electro thermal coupling field test device, and electric branch experimental system setup is as shown in Figure 2.This reality
Experiment device can simulate a variety of different actual conditions, and for different actual conditions, experimental implementation is different, separately below
It introduces:
The first operating condition, as shown in Fig. 4-(a), to the cable of dry run at different temperatures；The first step places second
Third rubbery sample: after first checking that electric branch experimental system setup is normal, start to connect sample pin electrode and electric branch experimental system
Device high-voltage end；Second step sets target temperature in temperature controller, the temperature sensor real-time measurement being made of thermocouple
The temperature inside the box guarantees that insulating box internal temperature reaches requirement of experiment by temperature control system, when temperature reaches set temperature
When, then 5min is waited to reach target temperature with the temperature for guaranteeing material；Third step carries out pressurization experiment: opening the pulse power
While start timing；4th step takes out sample: after specified pressing time, closing power supply and takes out sample, be statically placed in room temperature ring
Border 20min, preparation are observed under electric branch observation device.
Second of operating condition, as shown in Fig. 4-(b), to simulate after power cable short circuit, short circuit current is generated huge
Cable operating temperature change dramatically caused by big fuel factor；The first step places EP rubbers sample: first checking electric branch experiment system
After bulk cargo is set normally, start to connect sample pin electrode and electric branch experimental system setup high-voltage end；Second step, in temperature controller
Middle setting target temperature, the temperature sensor real-time measurement the temperature inside the box being made of thermocouple, is guaranteed by temperature control system
Insulating box internal temperature reaches requirement of experiment, when temperature reaches set temperature, then waits 5min to guarantee the temperature of material
Degree reaches target temperature；Third step carries out pressurization experiment: starting timing while opening the pulse power, when arrival setting time
Afterwards, the pulse power is closed；4th step sets another temperature (Fig. 4-(b) broken line latter half), by thermoelectricity in temperature controller
The temperature sensor real-time measurement the temperature inside the box occasionally formed guarantees that insulating box internal temperature reaches experiment by temperature control system
It is required that when temperature reaches set temperature, then 5min is waited to reach target temperature with the temperature for guaranteeing material；5th step,
Repressurization: start timing while opening the pulse power；6th step takes out sample: after specified pressing time, closing power supply
Sample is taken out, room temperature environment 20min is statically placed in, preparation is observed under electric branch observation device.
The third operating condition, as shown in Fig. 4-(c), to the temporary of running temperature variation caused by the increase and decrease of dummycable load
State temperature-rise period；The first step places EP rubbers sample: after first checking that electric branch experimental system setup is normal, starting connection examination
Sample pin electrode and electric branch experimental system setup high-voltage end；Second step sets target temperature in temperature controller, by thermocouple
Temperature sensor real-time measurement the temperature inside the box of composition guarantees that insulating box internal temperature reaches experiment and wants by temperature control system
It asks；The pulse power is opened while starting heating device；Third step takes out sample: after reaching setting target temperature, closing electricity
Sample is taken out in source, is statically placed in room temperature environment 20min, and preparation is observed under electric branch observation device.
4th kind of operating condition, as shown in Fig. 4-(d), in the case where having starting electric branch in dummycable, load
Transient state temperature-rise period caused by increase and decrease influences the aging of subsequent insulating materials；The first step is placed EP rubbers sample: first being examined
Look into electric branch experimental system setup it is normal after, start to connect sample pin electrode and electric branch experimental system setup high-voltage end；Second
Step, sets target temperature, the temperature sensor real-time measurement the temperature inside the box being made of thermocouple passes through temperature in temperature controller
Degree control system guarantees that insulating box internal temperature reaches requirement of experiment, when temperature reaches set temperature, then waits 5min
To guarantee that the temperature of material reaches target temperature；Third step carries out pressurization experiment: start timing while opening the pulse power,
After reaching setting time, the pulse power is closed；4th step sets new target temperature, by thermocouple in temperature controller
Temperature sensor real-time measurement the temperature inside the box of composition guarantees that insulating box internal temperature reaches experiment and wants by temperature control system
It asks；The pulse power is opened while starting heating device；5th step takes out sample: after reaching setting target temperature, closing electricity
Sample is taken out in source, is statically placed in room temperature environment 20min, and preparation is observed under electric branch observation device.
Step 3) observes electrical tree aging process situation inside sample, electric branch observation device structure under electric branch observation device
Such as Fig. 3.The first step places sample, debugs optical microscopy and CCD digital camera head.Optical microscopy of the invention is selected high
Multiplying power monotubular videomicroscopy, CCD digital camera head select 1X, and eyepiece multiple is 10X, electric branch image can be amplified 40 and arrived
400 times.Sample is placed on sheet glass, adjusting sample position is until can see that needle point.Cold light source position is adjusted, cold light is made
The light direct beam sample needle point that source issues, clearly to observe the internal situation of EP rubbers sample；Second step observes sample.It will
CCD digital camera head is connected with terminal, and the form of electric branch inside sample is observed by video software camera video recording great master, and
It photographs to record.It can start to assess insulation ag(e)ing through row using the method for tree length using the image of record.According to
Experiment discovery, it can be seen that the degree of aging of insulating materials is different under different condition under conditions of application voltage time is the same
Sample, therefore experimental result can mention for assessment EP rubbers insulation ag(e)ing degree under different temperature environments in Practical Project
For effectively instructing.The first step opens the picture of video software camera video recording great master's shooting；Second step operates virtual ruler,
At 0 scale of pin electrode tip align virtual ruler；Third step, operate virtual ruler removable graticule to electric branch extend it is farthest
End, reads the tree length that virtual ruler is shown；4th step, tree length is corresponding with the 300um length of calibration virtual
Ruler length is converted, and obtains the physical length of final electric branch.
Step 4) is calculated using the virtual ruler of ScreenRuler:
(1) picture of video software camera video recording great master's shooting is opened；
(2) virtual ruler is operated, at 0 scale of pin electrode tip align virtual ruler；
(3) distalmost end that the removable graticule of virtual ruler extends to electric branch is operated, the electric branch that virtual ruler is shown is read
Length；
(4) tree length virtual ruler length corresponding with the 300um length of calibration is converted, obtains final electricity tree
The physical length of branch, as shown in Figure 5.It can be seen that the picture of video software camera video recording great master's shooting can clearly be told
Electric branch pattern, ScreenRuler linear measure longimetry platform can accurately measure tree length.Therefore in different temperatures
Under environment, obvious using tree length characterization insulation ag(e)ing degree effect, the method for the results show tree length can
To become, the present invention is based on the appraisal procedures of the insulating materials aging of electro thermal coupling field.5min reaches liquid with the temperature for guaranteeing material
Nitrogen temperature；Third step carries out pressurization experiment: the method for first adding DC voltage voltage to add harmonic voltage again is taken, with the speed of 1kV/s
Rate is forced into specified DC voltage voltage value, adds harmonic voltage again after waiting 5min, is equally forced into finger with the rate of 1kV/s
Determine harmonic voltage numerical value, such sample has just been applied specified compound field voltage, as shown in Figure 4；4th step takes out sample:
After specified pressing time, closes power supply and take out sample, be statically placed in room temperature environment 20min, prepare under electric branch observation device
It is observed.
Step 3) observes electrical tree aging process situation inside sample, electric branch observation device structure under electric branch observation device
Such as Fig. 3.The first step places sample, debugs optical microscopy and CCD digital camera head.Optical microscopy of the invention is selected high
Multiplying power monotubular videomicroscopy, CCD digital camera head select 1X, and eyepiece multiple is 10X, electric branch image can be amplified 40 and arrived
400 times.Sample is placed on sheet glass, adjusting sample position is until can see that needle point.Cold light source position is adjusted, cold light is made
The light direct beam sample needle point that source issues, clearly to observe the internal situation of epoxy specimens；Second step observes sample.It will
CCD digital camera head is connected with terminal, and the form of electric branch inside sample is observed by video software camera video recording great master, and
It photographs to record.It can start to assess insulation ag(e)ing through row using the method for tree length using the image of record.According to
Experiment discovery, it can be seen that the degree of aging of insulating materials is different under different condition under conditions of application voltage time is the same
Sample, therefore experimental result can be assessment epoxy resin insulation ag(e)ing degree under the disturbance of harmonic wave overvoltage in Practical Project
Effectively guidance is provided.The first step opens the picture of video software camera video recording great master's shooting；Second step, operation are virtual
Ruler, at 0 scale of pin electrode tip align virtual ruler；Third step operates what the removable graticule of virtual ruler extended to electric branch
Distalmost end reads the tree length that virtual ruler is shown；4th step, by tree length void corresponding with the 2mm length of calibration
Quasi- ruler length is converted, and obtains the physical length of final electric branch.
Step 4) is calculated using the virtual ruler of ScreenRuler:
(1) picture of video software camera video recording great master's shooting is opened；
(2) virtual ruler is operated, at 0 scale of pin electrode tip align virtual ruler；
(3) distalmost end that the removable graticule of virtual ruler extends to electric branch is operated, the electric branch that virtual ruler is shown is read
Length；
(4) tree length virtual ruler length corresponding with the 2mm length of calibration is converted, obtains final electric branch
Physical length, as shown in Figure 5.It can be seen that the picture of video software camera video recording great master's shooting can clearly tell electricity
Branch pattern, ScreenRuler linear measure longimetry platform can accurately measure tree length.Therefore in different composite electricity
It is obvious using tree length characterization insulation ag(e)ing degree effect under swaging formula, different harmonic voltage frequencies, the results show
The method of tree length can be as the present invention is based on the assessments of the superconducting insulation material aging of DC stacked harmonic wave Composite Field
Method.
Claims (6)
1. the appraisal procedure of the insulating materials senile experiment device based on electro thermal coupling field, which is characterized in that long using electric branch
The method of degree effectively assesses high voltage DC power cable with insulating materials state of insulation, includes the following steps:
Step 1) prepares the EP rubbers test sample based on needle to board electrode；
Step 2) is tested using electro thermal coupling field test device；
Step 3) observes electrical tree aging process situation inside sample under electric branch observation device；
Step 4) is calculated using the virtual ruler of ScreenRuler:
(1) picture of video software camera video recording great master's shooting is opened；
(2) virtual ruler is operated, at 0 scale of pin electrode tip align virtual ruler；
(3) distalmost end that the removable graticule of virtual ruler extends to electric branch is operated, the tree length that virtual ruler is shown is read；
(4) tree length virtual ruler length corresponding with the 300um length of calibration is converted, obtains final electric branch
Physical length.
2. the appraisal procedure of the insulating materials senile experiment device according to claim 1 based on electro thermal coupling field, special
Sign is that the step 1) uses the electrical tree aging process sample based on needle to board electrode system, and pin electrode connects high voltage, ground electrode
Ground connection, sample are placed on plate electrode.
3. the appraisal procedure of the insulating materials senile experiment device according to claim 1 based on electro thermal coupling field, special
Sign is, the step 2) specifically: to the cable of dry run at different temperatures；
The first step places EP rubbers sample: after first checking that electric branch experimental system setup is normal, starting to connect sample pin electrode
With electric branch experimental system setup high-voltage end；
Second step sets target temperature in temperature controller, warm in the temperature sensor real-time measurement case be made of thermocouple
Degree guarantees that insulating box internal temperature reaches requirement of experiment by temperature control system, when temperature reaches set temperature, then
5min is waited to reach target temperature with the temperature for guaranteeing material；
Third step carries out pressurization experiment: starting timing while opening the pulse power；
4th step takes out sample: after specified pressing time, closes power supply and takes out sample, be statically placed in room temperature environment 20min, it is quasi-
It is standby to be observed under electric branch observation device.
4. the appraisal procedure of the insulating materials senile experiment device according to claim 1 based on electro thermal coupling field, special
Sign is, the step 2) specifically: to simulate after power cable short circuit, the huge fuel factor that short circuit current generates is led
The cable operating temperature change dramatically of cause；
The first step places EP rubbers sample: after first checking that electric branch experimental system setup is normal, starting to connect sample pin electrode
With electric branch experimental system setup high-voltage end；
Second step sets target temperature in temperature controller, warm in the temperature sensor real-time measurement case be made of thermocouple
Degree guarantees that insulating box internal temperature reaches requirement of experiment by temperature control system, when temperature reaches set temperature, then
5min is waited to reach target temperature with the temperature for guaranteeing material；
Third step carries out pressurization experiment: starting timing while opening the pulse power, after reaching setting time, closes pulse
Power supply；
4th step sets another temperature in temperature controller, warm in the temperature sensor real-time measurement case be made of thermocouple
Degree guarantees that insulating box internal temperature reaches requirement of experiment by temperature control system, when temperature reaches set temperature, then
5min is waited to reach target temperature with the temperature for guaranteeing material；
Repressurization: 5th step starts timing while opening the pulse power；
6th step takes out sample: after specified pressing time, closes power supply and takes out sample, be statically placed in room temperature environment 20min, it is quasi-
It is standby to be observed under electric branch observation device.
5. the appraisal procedure of the insulating materials senile experiment device according to claim 1 based on electro thermal coupling field, special
Sign is, the step 2) specifically: the transient state to running temperature variation caused by the increase and decrease of dummycable load heated up
Journey；
The first step places EP rubbers sample: after first checking that electric branch experimental system setup is normal, starting to connect sample pin electrode
With electric branch experimental system setup high-voltage end；
Second step sets target temperature in temperature controller, warm in the temperature sensor real-time measurement case be made of thermocouple
Degree guarantees that insulating box internal temperature reaches requirement of experiment by temperature control system；Pulse is opened while starting heating device
Power supply；
Third step takes out sample: after reaching setting target temperature, closing power supply and takes out sample, be statically placed in room temperature environment
20min, preparation are observed under electric branch observation device.
6. the appraisal procedure of the insulating materials senile experiment device according to claim 1 based on electro thermal coupling field, special
Sign is, the step 2) specifically: in the case where having starting electric branch in dummycable, caused by the increase and decrease of load
Transient state temperature-rise period the aging of subsequent insulating materials is influenced；
The first step places EP rubbers sample: after first checking that electric branch experimental system setup is normal, starting to connect sample pin electrode
With electric branch experimental system setup high-voltage end；
Second step sets target temperature in temperature controller, warm in the temperature sensor real-time measurement case be made of thermocouple
Degree guarantees that insulating box internal temperature reaches requirement of experiment by temperature control system, when temperature reaches set temperature, then
5min is waited to reach target temperature with the temperature for guaranteeing material；
Third step carries out pressurization experiment: starting timing while opening the pulse power, after reaching setting time, closes pulse
Power supply；
4th step sets new target temperature in temperature controller, the temperature sensor real-time measurement case being made of thermocouple
Interior temperature guarantees that insulating box internal temperature reaches requirement of experiment by temperature control system；It is opened while starting heating device
The pulse power；
5th step takes out sample: after reaching setting target temperature, closing power supply and takes out sample, be statically placed in room temperature environment
20min, preparation are observed under electric branch observation device.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157856A (en) * | 2020-01-03 | 2020-05-15 | 天津大学 | Insulating electric branch growth characteristic testing arrangement under magnetic field environment |
| CN111505472A (en) * | 2020-05-12 | 2020-08-07 | 全球能源互联网研究院有限公司 | Preparation method of thermoplastic insulation sample for electrical tree degradation experiment |
| CN111830369A (en) * | 2020-01-10 | 2020-10-27 | 天津大学 | Insulation aging evaluation method based on temperature gradient and composite voltage |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1133701B1 (en) * | 1998-11-23 | 2005-06-22 | Harry E. Orton | Method for diagnosing insulation degradation in underground cable |
| CN106054037A (en) * | 2016-06-13 | 2016-10-26 | 哈尔滨理工大学 | Electrical tree observation device with heating and partial discharge monitoring functions |
| CN106199194A (en) * | 2016-07-11 | 2016-12-07 | 太原理工大学 | A kind of mine cable insulation EP rubbers surface electricity trace state feature extracting method |
| CN106501277A (en) * | 2016-11-02 | 2017-03-15 | 华北电力大学（保定） | The alterating and direct current branch microscopic observation system of synchronzed press temperature-controllable and method |
| CN106970307A (en) * | 2017-04-28 | 2017-07-21 | 天津大学 | A kind of test device and method of high-voltage direct-current cable accessory electric branch characteristic |
| CN107064754A (en) * | 2017-03-28 | 2017-08-18 | 国网上海市电力公司 | A kind of variable pulse voltage triggers the device of epoxy resin insulation material electric branch |
| CN107573598A (en) * | 2017-08-23 | 2018-01-12 | 天津大学 | High-voltage direct-current cable accessory insulation matching method for improving based on mixed nanometer |
| CN108020763A (en) * | 2017-12-14 | 2018-05-11 | 长沙理工大学 | A kind of monitoring method of direct current submarine cable early stage electricity tree defect |
| CN108387827A (en) * | 2018-04-23 | 2018-08-10 | 天津大学 | A kind of electric branch characteristic test device under industrial frequency superimposed harmonic voltage and method |
| CN109188215A (en) * | 2018-08-22 | 2019-01-11 | 西南交通大学 | A kind of EP rubbers cable terminal insulation layer difference degradation failure analogy method |
-
2019
- 2019-03-20 CN CN201910211597.7A patent/CN110057816A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1133701B1 (en) * | 1998-11-23 | 2005-06-22 | Harry E. Orton | Method for diagnosing insulation degradation in underground cable |
| CN106054037A (en) * | 2016-06-13 | 2016-10-26 | 哈尔滨理工大学 | Electrical tree observation device with heating and partial discharge monitoring functions |
| CN106199194A (en) * | 2016-07-11 | 2016-12-07 | 太原理工大学 | A kind of mine cable insulation EP rubbers surface electricity trace state feature extracting method |
| CN106501277A (en) * | 2016-11-02 | 2017-03-15 | 华北电力大学（保定） | The alterating and direct current branch microscopic observation system of synchronzed press temperature-controllable and method |
| CN107064754A (en) * | 2017-03-28 | 2017-08-18 | 国网上海市电力公司 | A kind of variable pulse voltage triggers the device of epoxy resin insulation material electric branch |
| CN106970307A (en) * | 2017-04-28 | 2017-07-21 | 天津大学 | A kind of test device and method of high-voltage direct-current cable accessory electric branch characteristic |
| CN107573598A (en) * | 2017-08-23 | 2018-01-12 | 天津大学 | High-voltage direct-current cable accessory insulation matching method for improving based on mixed nanometer |
| CN108020763A (en) * | 2017-12-14 | 2018-05-11 | 长沙理工大学 | A kind of monitoring method of direct current submarine cable early stage electricity tree defect |
| CN108387827A (en) * | 2018-04-23 | 2018-08-10 | 天津大学 | A kind of electric branch characteristic test device under industrial frequency superimposed harmonic voltage and method |
| CN109188215A (en) * | 2018-08-22 | 2019-01-11 | 西南交通大学 | A kind of EP rubbers cable terminal insulation layer difference degradation failure analogy method |
Non-Patent Citations (3)
| Title |
|---|
| L. W. ZHU: "Effect of High Temperature on Electrical Effect of High Temperature on Electrical Treeing of Polypropylene with Repetitive Pulse Voltage", 《IEEE XPLORE》 * |
| 程志平: "《高等院校"十三五"规划教材 网页设计与制作》", 31 August 2017, 重庆大学出版社 * |
| 苏金刚: "多场耦合作用硅橡胶电树枝产生机理研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157856A (en) * | 2020-01-03 | 2020-05-15 | 天津大学 | Insulating electric branch growth characteristic testing arrangement under magnetic field environment |
| CN111830369A (en) * | 2020-01-10 | 2020-10-27 | 天津大学 | Insulation aging evaluation method based on temperature gradient and composite voltage |
| CN111505472A (en) * | 2020-05-12 | 2020-08-07 | 全球能源互联网研究院有限公司 | Preparation method of thermoplastic insulation sample for electrical tree degradation experiment |
| CN111505472B (en) * | 2020-05-12 | 2022-06-10 | 全球能源互联网研究院有限公司 | Preparation method of thermoplastic insulation sample for electrical tree degradation experiment |
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Application publication date: 20190726 |