CN110221186A - A kind of darkroom alternating-current voltage resistance test device and test method - Google Patents
A kind of darkroom alternating-current voltage resistance test device and test method Download PDFInfo
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- CN110221186A CN110221186A CN201910509894.XA CN201910509894A CN110221186A CN 110221186 A CN110221186 A CN 110221186A CN 201910509894 A CN201910509894 A CN 201910509894A CN 110221186 A CN110221186 A CN 110221186A
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- 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
Abstract
The present invention provides a kind of darkroom alternating-current voltage resistance test device and test method, and test console is equipped in operating room, and test console is equipped with display screen and controlling terminal；Laboratory is darkroom, and step-up transformer is equipped in laboratory, and the side of step-up transformer is equipped with test product workbench；One end of test product transmission belt is equipped with test product transmission vehicle；Room alternating-current voltage resistance test device carries out ac voltage withstanding test in dark situation, it is absorbed by the first high-definition camera and the second high-definition camera and is tested electrical component ac voltage withstanding test procedural image information in dark situation, and it is transferred to controlling terminal, it is shown by display screen, simultaneously, ac voltage withstanding test procedural image information is compared with pre-set image information in real time for controlling terminal, when occurring corona discharge status information or/and creeping discharge information in image information, issues warning note.The superiority and inferiority degree of test product can be intuitively judged, and prevents to cause after use connectivity to puncture and a possibility that thermal breakdown.
Description
Technical field
The present invention relates to ac voltage withstanding experimental technique field more particularly to a kind of darkroom alternating-current voltage resistance test device and tests
Method.
Background technique
Ac voltage withstanding test is the method for detecting insulation of electrical installation intensity, and ac voltage withstanding test belongs to preventive trial.
Ac voltage withstanding test voltage is higher than electrical equipment normal operating voltage, and after test passes through, electrical equipment has certain electrical peace
Full nargin, at present ac voltage withstanding test are to guarantee electrical equipment safe operation main means.
After some electrical equipments pass through ac voltage withstanding pass the test, occurs insulation slight crack in day-to-day operation so that the later period
Connectivity is caused to puncture, such case usually occurs to form thermal breakdown in insulator, transformer, arrester, mutual inductor etc..Into
Row analysis finds, since corona discharge, creeping discharge fail timely to obtain, to cause to exchange resistance to when carrying out ac voltage withstanding test
Pressure test is omitted, and brings great hidden danger for the use of later period electrical equipment.
Summary of the invention
In order to overcome the deficiencies in the prior art described above, the present invention provides a kind of darkroom alternating-current voltage resistance test device, comprising:
Operating room and laboratory；Automatic shield is equipped between operating room and laboratory；
Test console is equipped in operating room, test console is equipped with display screen and controlling terminal；
Laboratory is darkroom, and step-up transformer is equipped in laboratory, and the side of step-up transformer is equipped with test product workbench；Examination
Product workbench is equipped with test product transmission belt and pressure test position；One end of test product transmission belt is equipped with test product transmission vehicle；
The two sides of test product transmission belt are respectively equipped with the first high-definition camera and the second high-definition camera；
First high-definition camera and the second high-definition camera are communicated to connect with controlling terminal respectively, the first high-definition camera and
Second high-definition camera is respectively used to be tested electrical component ac voltage withstanding test procedural image information in intake dark situation, and transmits
To controlling terminal, shown by display screen, meanwhile, controlling terminal is in real time by ac voltage withstanding test procedural image information and default figure
As information is compared, when occurring corona discharge status information or/and creeping discharge information in image information, issues alarm and mention
Show.
Explanation is needed further exist for, close ac voltage withstanding test area is equipped with cigarette propagated sensation sensor at the top of laboratory；It is trying
Room side wall is tested equipped with exhaust fan；
Exhaust fan and cigarette propagated sensation sensor are communicated to connect with controlling terminal respectively；
Cigarette propagated sensation sensor is used to be perceived after unqualified tested electrical component breakdown generates smog by cigarette propagated sensation sensor, and
Information is transmitted to controlling terminal；
Controlling terminal controls exhaust fan starting, vapour discharge gas.
Explanation is needed further exist for, manipulator is equipped in laboratory and rejected product disposes position；
Manipulator is connect with controlling terminal, and manipulator is used for the controlling terminal control when rejected product occurs in pressure test position
Manipulator processed grabs rejected product to rejected product and disposes position.
Explanation is needed further exist for, controlling terminal is also used to obtain the first pressure test figure by the first high-definition camera
Picture；The second pressure test image is obtained by the second high-definition camera；
The the first pressure test image temporal that will acquire is set as at the first time, will acquire the second pressure test image temporal
It was set as the second time；
Time interval is equipped with the second time at the first time；At the first time earlier than the second time；
First pressure test image is split according to default fractionation region, splits into multiple images block；
Each image block of first pressure test image is respectively corresponded and compare based on gray scale with preset image block；
The pixel of each image block is matched into average gray simultaneously, extracts and is compared with default average gray, such as
Fruit is more than gray scale average threshold, or then judges occur corona discharge status information in present image information more than gray threshold
Or/and creeping discharge information；
The second pressure test image is transferred simultaneously, the second pressure test image is split according to default fractionation region,
Split into multiple images block；
Each image block of second pressure test image is respectively corresponded and compare based on gray scale with preset image block；
The pixel of each image block is matched into average gray simultaneously, extracts and is compared with default average gray, such as
Fruit is more than gray scale average threshold, or is more than gray threshold, then proves occur corona discharge status information in present image information
Or/and creeping discharge information.
Explanation is needed further exist for, automatic shield is connected with rack gear, rack gear connection gear, and gear is connected by speed reducer
Driving motor；Driving motor is connect with controlling terminal, and controlling terminal is equipped with driving motor control port；
Test protective module is additionally provided on automatic shield, test protective module is connect with controlling terminal, tests protective module
For incuding the closed state of automatic shield.
Explanation is needed further exist for, Temperature Humidity Sensor, Temperature Humidity Sensor and control are additionally provided on laboratory's side wall
Terminal communication connection；Temperature Humidity Sensor is used to the test room temperature humidity of induction being transferred to controlling terminal, joins for testing crew
It examines.
Explanation is needed further exist for, is additionally provided with emergency lamp on laboratory's side wall；Emergency lamp is to test
Room is illuminated；Headlamp is equipped in operating room；
Operating room is equipped with operating room door；Laboratory is equipped with laboratory's door；
Operating room door and laboratory's door are respectively to be driven by electricity Rail Door.
Explanation is needed further exist for, step-up transformer receives the ac voltage withstanding that controlling terminal is sent and tests enabled instruction,
Using arch metal contact chip contact test specimen starting boosting thereon；
Step-up transformer is connected with ground line, by the electrical component of control line attended operation chamber interior, in operating room
The power supply of portion's electrical component.
The present invention also provides a kind of darkroom ac voltage withstanding test method, method includes:
Testing crew enters test room illumination lamp starting, and testing crew puts tested electrical component in test product transmission belt,
Subsequently into operating room, ac voltage withstanding test process is opened；
Controlling terminal controls driving motor operation, and automatic shield is isolated by operating room and laboratory；
The operation of test product transmission belt, when being tested operation of electric element to pressure test position, controlling terminal controls step-up transformer
It runs, the arch metal contact chip contact test specimen starting boosting on step-up transformer, after reaching predeterminated voltage, when persistently presetting
It is long；
Controlling terminal obtains video image information by the first high-definition camera and the second high-definition camera in real time, by with
Pre-set image information is compared, and when occurring corona discharge status information or/and creeping discharge information in image information, issues
Warning note；
The electrical component that do not test by ac voltage withstanding to rejected product is disposed by position by manipulator simultaneously.
Explanation is needed further exist for, after the detection of tested electrical component passes through, the operation of test product transmission belt makes next quilt
Survey electrical component is moved to pressure test position and is tested.
As can be seen from the above technical solutions, the invention has the following advantages that
Darkroom alternating-current voltage resistance test device carries out ac voltage withstanding test in dark situation, passes through the first high-definition camera and
Two high-definition cameras, which absorb, is tested electrical component ac voltage withstanding test procedural image information in dark situation, and is transferred to control eventually
End, is shown by display screen, meanwhile, controlling terminal in real time by ac voltage withstanding test procedural image information and pre-set image information into
Row compares, and when occurring corona discharge status information or/and creeping discharge information in image information, issues warning note.It can be with
The superiority and inferiority degree of test product intuitively is judged, and prevents to cause after use connectivity to puncture and a possibility that thermal breakdown.
Device can also carry out piecemeal comparison to pressure test image, and it is resistance to improve exchange for pixel ratio equity various ways
Pressure test is to the judgment accuracy for corona discharge status information or/and creeping discharge information occur.Avoid due to corona discharge,
Creeping discharge fails timely to obtain, and ac voltage withstanding test is caused to omit, and brings pole for the use of later period electrical equipment
Big hidden danger.
Detailed description of the invention
In order to illustrate more clearly of technical solution of the present invention, attached drawing needed in description will be made below simple
Ground introduction, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ordinary skill
For personnel, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is darkroom alternating-current voltage resistance test device schematic diagram.
Specific embodiment
The present invention provides a kind of darkroom alternating-current voltage resistance test device, as shown in Figure 1, comprising: operating room 21 and laboratory 19；
Automatic shield 17 is equipped between operating room 21 and laboratory 19；
Test console 12 is equipped in operating room 21, test console 12 is equipped with display screen and controlling terminal；Test
Room 19 is darkroom, and step-up transformer 13 is equipped in laboratory 19, and the side of step-up transformer 13 is equipped with test product workbench 7；Test product
Workbench 7 is equipped with test product transmission belt 8 and pressure test position；One end of test product transmission belt 8 is equipped with test product transmission vehicle 16；Test product passes
The two sides of defeated band 8 are respectively equipped with the first high-definition camera 5 and the second high-definition camera 6；First high-definition camera 5 and the second high definition
Camera 6 is communicated to connect with controlling terminal respectively, and the first high-definition camera 5 and the second high-definition camera 6 are respectively used to intake secretly
It is tested electrical component ac voltage withstanding in environment and tests procedural image information, and is transferred to controlling terminal, is shown by display screen, together
When, ac voltage withstanding test procedural image information is compared with pre-set image information in real time for controlling terminal, when in image information
When there is corona discharge status information or/and creeping discharge information, warning note is issued.
Image alignments of the invention are specifically, controlling terminal is also used to obtain first by the first high-definition camera 5
Pressure test image；The second pressure test image is obtained by the second high-definition camera 6；
The the first pressure test image temporal that will acquire is set as at the first time, will acquire the second pressure test image temporal
It was set as the second time；
Time interval is equipped with the second time at the first time；At the first time earlier than the second time；By the first pressure test figure
As being split according to default fractionation region, multiple images block is split into；By each image block of the first pressure test image point
With preset image block Dui Ying compare based on gray scale；The pixel of each image block gray scale is matched simultaneously to be averaged
Value, extracts and compares with default average gray, if it exceeds gray scale average threshold, or then sentence more than gray threshold
There is corona discharge status information or/and creeping discharge information in disconnected present image information；
The second pressure test image is transferred simultaneously, the second pressure test image is split according to default fractionation region,
Split into multiple images block；Each image block of second pressure test image is respectively corresponded and is based on preset image block
Gray scale compares；The pixel of each image block matched into average gray simultaneously, extract with default average gray into
Row comparison, if it exceeds gray scale average threshold, or be more than gray threshold, then prove corona discharge occur in present image information
Status information or/and creeping discharge information.
Namely after comparing by the first pressure test image, occur occurring corona discharge shape in present image information
State information or/and creeping discharge information, then verified by the second pressure test image, and then improve the accurate of judgement
Property.And the operand of image judgement is reduced, the efficiency of pressure test image detection is improved, is avoided using artificial detection
Not in time, not accurate problem.The comparison of image block pixel may be implemented, the comparison of whole image information also may be implemented.
19 top of laboratory is equipped with cigarette propagated sensation sensor 9 close to ac voltage withstanding test area；It is equipped on 19 side wall of laboratory
Exhaust fan 11；Exhaust fan 11 and cigarette propagated sensation sensor 9 are communicated to connect with controlling terminal respectively；Cigarette propagated sensation sensor 9 is used for when unqualified
After tested electrical component breakdown generates smog, perceived by cigarette propagated sensation sensor 9, and transmit information to controlling terminal；Controlling terminal control
Exhaust fan 11 processed starts, vapour discharge gas.
It is equipped with manipulator 18 in laboratory 19 and rejected product disposes position；Manipulator 18 is connect with controlling terminal, manipulator
18 for when rejected product occurs in pressure test position, controlling terminal to control manipulator 18 and grabs rejected product to rejected product peace
Set.
Controlling terminal can be computer, and industrial personal computer etc. controlling terminal may be implemented in hardware, software, firmware or they
Any combination.The various features are module, and unit or assembly may be implemented together in integration logic device or separated work
For discrete but interoperable logical device or other hardware devices.In some cases, the various features of electronic circuit can
To be implemented as one or more integrated circuit device, such as IC chip or chipset.
It includes that one or more processors execute that controlling terminal, which is software and/or firmware by processing circuit, and such as one or more
A digital signal processor (DSP), general purpose microprocessor, application-specific integrated circuit ASICs, field programmable gate array
(FPGA) or other equivalents are integrated circuit or discrete logic.Therefore, term " processor, " is due to for this
It can refer to that any aforementioned structure or any other structure are more suitable for the technology as described herein realized when literary.In addition, one
In terms of a little, function described in the disclosure can be provided in software module and hardware module.
Automatic shield 17 is connected with rack gear, rack gear connection gear, and gear connects driving motor by speed reducer；Driving motor
It is connect with controlling terminal, controlling terminal is equipped with driving motor control port；It is additionally provided with test protective module on automatic shield 17, is tried
It tests protective module to connect with controlling terminal, test protective module is used to incude the closed state of automatic shield 17.When automatic shield
17 when being in off state, and makes mutually isolated between operating room 21 and laboratory 19, could open ac voltage withstanding test.Controlling test
The automatic locking of shield 17 is fail to open after the starting of platform 12.
Temperature Humidity Sensor 10 is additionally provided on 19 side wall of laboratory, Temperature Humidity Sensor 10 and controlling terminal communicate to connect；
Temperature Humidity Sensor 10 is used to the test room temperature humidity of induction being transferred to controlling terminal, refers to for testing crew.
Emergency lamp 4 is additionally provided on 19 side wall of laboratory；Emergency lamp 4 is to illuminate laboratory 19；Behaviour
Make to be equipped with headlamp 3 in room 21；Operating room 21 is equipped with operating room door 1；Laboratory 19 is equipped with laboratory's door 2；Operating room door 1 and examination
Testing room door 2 is respectively to be driven by electricity Rail Door.Rail Door is driven by electricity in the present invention can also be made based on the control of controlling terminal
Obtaining ac voltage withstanding test can be full-automatic operation.
Step-up transformer 13 receives the ac voltage withstanding that controlling terminal is sent and tests enabled instruction, using arch metal thereon
Contact chip contacts test specimen starting boosting；Step-up transformer 13 is connected with ground line 15, by 14 attended operation room 21 of control line
The electrical component in portion is powered for 21 electric elements inside of operating room.
The present invention also provides a kind of darkroom ac voltage withstanding test method, method includes:
Testing crew enters test room illumination lamp starting, and testing crew puts tested electrical component in test product transmission belt,
Subsequently into operating room, ac voltage withstanding test process is opened；
Controlling terminal controls driving motor operation, and automatic shield is isolated by operating room and laboratory；
The operation of test product transmission belt, when being tested operation of electric element to pressure test position, controlling terminal controls step-up transformer
It runs, the arch metal contact chip contact test specimen starting boosting on step-up transformer, after reaching predeterminated voltage, when persistently presetting
It is long；
Controlling terminal obtains video image information by the first high-definition camera and the second high-definition camera in real time, by with
Pre-set image information is compared, and when occurring corona discharge status information or/and creeping discharge information in image information, issues
Warning note；Here if perceived after the breakdown of unqualified tested electrical component generates smog by cigarette propagated sensation sensor 9, and to control
Terminal transmits information；Controlling terminal controls exhaust fan 11 and starts, vapour discharge gas.And testing crew can learn tested
The information of electrical component breakdown.
The electrical component that do not test by ac voltage withstanding to rejected product is disposed by position by manipulator simultaneously.
After the detection of tested electrical component passes through, the operation of test product transmission belt is moved to next tested electrical component resistance to
Pressure test position is tested.
Test console, step-up transformer, be equipped on test product workbench 25 square millimeters specification test ground line,
The safety of guarantee test operator and equipment.Corona discharge, creeping discharge reflection are obvious in dark situation, can intuitively make and sentence
The superiority and inferiority degree of disconnected test product, and prevent to cause after use connectivity to puncture and a possibility that thermal breakdown.Dark room test method is electricity
Gas on-line operation provides safely technical support.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of darkroom alternating-current voltage resistance test device characterized by comprising operating room (21) and laboratory (19)；Operating room
(21) automatic shield (17) are equipped between laboratory (19)；
Test console (12) are equipped in operating room (21), test console (12) is equipped with display screen and controlling terminal；
Laboratory (19) is darkroom, is equipped with step-up transformer (13) in laboratory (19), the side of step-up transformer (13) is equipped with
Test product workbench (7)；Test product workbench (7) is equipped with test product transmission belt (8) and pressure test position；The one of test product transmission belt (8)
End is equipped with test product transmission vehicle (16)；
The two sides of test product transmission belt (8) are respectively equipped with the first high-definition camera (5) and the second high-definition camera (6)；
First high-definition camera (5) and the second high-definition camera (6) are communicated to connect with controlling terminal respectively, the first high-definition camera
(5) and the second high-definition camera (6) is respectively used to be tested electrical component ac voltage withstanding test procedural image letter in intake dark situation
Breath, and it is transferred to controlling terminal, it is shown by display screen, meanwhile, controlling terminal is in real time by ac voltage withstanding test procedural image letter
Breath is compared with pre-set image information, when occurring corona discharge status information or/and creeping discharge information in image information,
Issue warning note.
2. darkroom alternating-current voltage resistance test device according to claim 1, which is characterized in that
Cigarette propagated sensation sensor (9) is equipped with close to ac voltage withstanding test area at the top of laboratory (19)；It is set on laboratory (19) side wall
There are exhaust fan (11)；
Exhaust fan (11) and cigarette propagated sensation sensor (9) are communicated to connect with controlling terminal respectively；
Cigarette propagated sensation sensor (9) is used to be perceived after unqualified tested electrical component breakdown generates smog by cigarette propagated sensation sensor (9),
And information is transmitted to controlling terminal；
Controlling terminal controls exhaust fan (11) starting, vapour discharge gas.
3. darkroom alternating-current voltage resistance test device according to claim 1 or 2, which is characterized in that
It is equipped with manipulator (18) in laboratory (19) and rejected product disposes position；
Manipulator (18) is connect with controlling terminal, and manipulator (18) is used for when rejected product occurs in pressure test position, and control is eventually
End control manipulator (18) grabs rejected product to rejected product and disposes position.
4. darkroom alternating-current voltage resistance test device according to claim 1 or 2, which is characterized in that
Controlling terminal is also used to obtain the first pressure test image by the first high-definition camera (5)；Pass through the second high-definition camera
Head (6) obtains the second pressure test image；
The the first pressure test image temporal that will acquire is set as at the first time, will acquire the setting of the second pressure test image temporal
For the second time；
Time interval is equipped with the second time at the first time；At the first time earlier than the second time；
First pressure test image is split according to default fractionation region, splits into multiple images block；
Each image block of first pressure test image is respectively corresponded and compare based on gray scale with preset image block；Simultaneously
The pixel of each image block is matched into average gray, extracts and is compared with default average gray, if super
Cross gray scale average threshold, or then judge more than gray threshold to occur in present image information corona discharge status information or/and
Creeping discharge information；
The second pressure test image is transferred simultaneously, the second pressure test image is split according to default fractionation region, is split
At multiple images block；
Each image block of second pressure test image is respectively corresponded and compare based on gray scale with preset image block；Simultaneously
The pixel of each image block is matched into average gray, extracts and is compared with default average gray, if super
Cross gray scale average threshold, or be more than gray threshold, then prove to occur in present image information corona discharge status information or/and
Creeping discharge information.
5. darkroom alternating-current voltage resistance test device according to claim 1 or 2, which is characterized in that
Automatic shield (17) is connected with rack gear, rack gear connection gear, and gear connects driving motor by speed reducer；Driving motor with
Controlling terminal connection, controlling terminal are equipped with driving motor control port；
Test protective module is additionally provided on automatic shield (17), test protective module is connect with controlling terminal, tests protective module
For incuding the closed state of automatic shield (17).
6. darkroom alternating-current voltage resistance test device according to claim 1 or 2, which is characterized in that
It is additionally provided with Temperature Humidity Sensor (10) on laboratory (19) side wall, Temperature Humidity Sensor (10) and controlling terminal communication link
It connects；Temperature Humidity Sensor (10) is used to the test room temperature humidity of induction being transferred to controlling terminal, refers to for testing crew.
7. darkroom alternating-current voltage resistance test device according to claim 1 or 2, which is characterized in that
Emergency lamp (4) are additionally provided on laboratory (19) side wall；Emergency lamp (4) is to shine laboratory (19)
It is bright；Headlamp (3) are equipped in operating room (21)；
Operating room (21) is equipped with operating room door (1)；Laboratory (19) is equipped with laboratory's door (2)；
Operating room door (1) and laboratory's door (2) are respectively to be driven by electricity Rail Door.
8. darkroom alternating-current voltage resistance test device according to claim 1 or 2, which is characterized in that
Step-up transformer (13) receives the ac voltage withstanding that controlling terminal is sent and tests enabled instruction, is connect using arch metal thereon
The starting boosting of contact pad test specimen；
Step-up transformer (13) is connected with ground line (15), passes through the internal electrical member in control line (14) attended operation room (21)
Part is powered for operating room (21) electric elements inside.
9. a kind of darkroom ac voltage withstanding test method, which is characterized in that method includes:
Testing crew enters test room illumination lamp starting, and testing crew puts tested electrical component in test product transmission belt, then
Into operating room, ac voltage withstanding test process is opened；
Controlling terminal controls driving motor operation, and automatic shield is isolated by operating room and laboratory；
The operation of test product transmission belt, when being tested operation of electric element to pressure test position, controlling terminal controls step-up transformer operation,
Arch metal contact chip contact test specimen starting boosting on step-up transformer, after reaching predeterminated voltage, continues preset duration；
Controlling terminal obtains video image information by the first high-definition camera and the second high-definition camera in real time, by with it is default
Image information is compared, and when occurring corona discharge status information or/and creeping discharge information in image information, issues alarm
Prompt；
The electrical component that do not test by ac voltage withstanding to rejected product is disposed by position by manipulator simultaneously.
10. ac voltage withstanding test method in darkroom according to claim 9, which is characterized in that method includes:
After the detection of tested electrical component passes through, the operation of test product transmission belt makes next tested electrical component be moved to pressure-resistant examination
Position is tested to be tested.
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| CN112881873A (en) * | 2021-01-13 | 2021-06-01 | 中车青岛四方机车车辆股份有限公司 | Pressure resistance test system and test method |
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| CN109164361A (en) * | 2018-09-21 | 2019-01-08 | 国网辽宁省电力有限公司沈阳供电公司 | It is a kind of based on the alternating-current voltage resistance test device used under extreme condition and method |
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| CN112881873A (en) * | 2021-01-13 | 2021-06-01 | 中车青岛四方机车车辆股份有限公司 | Pressure resistance test system and test method |
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