CN112269090A - Aging and partial discharge testing device - Google Patents
Aging and partial discharge testing device Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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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
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Abstract
The invention discloses an aging and partial discharge testing device. Wherein, this ageing and partial discharge testing arrangement includes: the high-voltage generation module is used for generating a high-voltage power supply and providing the high-voltage power supply required by the test for the aging object to be tested; the temperature and humidity control module is used for controlling the temperature and the humidity required by the test of the aging object to be tested; and the partial discharge monitoring module is used for detecting partial discharge signals of the aging object to be tested under the temperature and humidity provided by the high-voltage power supply and the temperature and humidity control module provided by the high-voltage generation module so as to obtain an aging and partial discharge test result of the aging object to be tested. The invention solves the technical problems of low reliability caused by the fact that the aging and partial discharge test device in the related technology is implemented in a mode of matching a sensor with an oil bath or an electric heater.
Description
Technical Field
The invention relates to the technical field of insulation detection of high-voltage equipment, in particular to an aging and partial discharge testing device.
Background
The insulating polymer is widely applied to electrical equipment due to excellent mechanical property and electrical property, but is difficult to avoid the influence of factors such as electricity, heat, humidity and the like in the operation process, so that the performance of the polymer is deteriorated, and the normal operation of the whole power supply system is greatly threatened; in particular, with the increase of voltage class and the increase of transmission capacity, the requirements on the insulation performance of the polymer are higher. Therefore, on the basis of carrying out artificial accelerated aging in a laboratory, the aging characteristic of the polymer material is researched, and the method has important guiding significance for solving the operation fault of the power supply system. Partial discharge detection is commonly used for insulation detection and diagnosis of high-voltage equipment as a nondestructive detection technology. Compared with other detection quantities such as dielectric loss, insulation resistance and the like, the partial discharge data can reflect the insulation condition more accurately and effectively.
However, in the prior art, most aging test devices are generally designed in such a way that an oil bath or an electric heater matched sensor is used for controlling the aging temperature, so that the temperature control precision is low, the change speed is slow, and the aging mode is single; the space of a test area is generally small, the heat insulation effect is poor, the aging voltage level is not high, and most of the test areas are only suitable for aging of an insulation sample wafer; and online data monitoring cannot be realized. And actual high-voltage equipment operation operating mode is abominable, easily suffers cold and hot alternation, high humidity and high voltage effect, compares in traditional ageing, has greatly aggravated its insulation degradation speed.
Aiming at the problems that the aging and partial discharge test device in the related technology is implemented in a mode of matching a sensor through an oil bath or an electric heater, and the reliability is low, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides an aging and partial discharge testing device, which at least solves the technical problem that in the related technology, an aging and partial discharge testing device is implemented in a mode of an oil bath or an electric heater matched sensor, and the reliability is low.
According to an aspect of an embodiment of the present invention, there is provided an aging and partial discharge test apparatus, including: the high-voltage generation module is used for generating a high-voltage power supply and providing the high-voltage power supply required by the test for the aging object to be tested; the temperature and humidity control module is used for controlling the temperature and the humidity required by the test of the aging object to be tested; the partial discharge monitoring module is used for detecting the partial discharge signals of the high-voltage power supply, the temperature and the humidity provided by the temperature and humidity control module, which are provided by the high-voltage generation module, of the aging object to be tested so as to obtain the aging and partial discharge test results of the aging object to be tested.
Optionally, the high voltage generation module comprises: the power supply is used for providing a working power supply for the aging object to be detected; the voltage regulating platform and the transformer are connected with the power supply and used for regulating a working power supply provided by the power supply into a high-voltage power supply required by the aging object to be detected; and the high-voltage bushing is arranged at the top of the test box, so that the high-voltage power supply is applied to the object to be aged through the high-voltage bushing.
Optionally, the high voltage generation module comprises: and one end of the protection resistor is connected with the transformer, and the other end of the protection resistor is connected with the capacitive voltage divider and used for collecting a high-voltage power supply passing through the protection resistor.
Optionally, the resistance of the protection resistor is 10k Ω, and the voltage division ratio of the capacitive voltage divider is 1: 1000.
optionally, the temperature and humidity control module is arranged in the test box, the temperature adjusting range is-50 ℃ to 150 ℃, the temperature control precision is 0.5 ℃, the temperature rising speed is 3 ℃/min, and the temperature reducing speed is 1 ℃/min.
Optionally, the humidity control range of the temperature and humidity control module is 20% to 98%, and the humidity control precision is 3%.
Optionally, the partial discharge monitoring module includes: the partial discharge instrument detects a partial discharge signal of the aging object to be detected in a pulse current mode; and the terminal equipment is connected with the partial discharge instrument and used for displaying the partial discharge signal and processing the partial discharge signal so as to obtain the aging and partial discharge test result of the aging object to be tested.
Optionally, the detection time precision of the partial discharge instrument is 2ns, and the sampling rate is 64 MS/s.
Optionally, an insulating support with adjustable height is arranged in the test chamber and used for fixing the aging object to be tested.
Optionally, the burn-in and partial discharge testing apparatus has at least one of the following testing functions: constant temperature aging test, cold-hot cycle aging test, electrical aging test, wet-hot aging test, wet-electrical aging test, wet-cold-hot cycle aging test, electrical-hot aging test, electrical-cold-hot cycle aging test, electrical-wet-hot aging test, and electrical-wet-cold-hot cycle aging test.
In the embodiment of the invention, a high-voltage generation module is adopted for generating a high-voltage power supply and providing the high-voltage power supply required by the test for the aging object to be tested; the temperature and humidity control module is used for controlling the temperature and the humidity required by the test of the aging object to be tested; the aging and partial discharge testing device provided by the embodiment of the invention realizes the integration of the high-voltage generation module, the temperature and humidity control module and the partial discharge monitoring module together, thereby synchronously integrating the aging and partial discharge signal detection, and carrying out the real-time online monitoring of the aged sample partial discharge signal in the aging process, achieving the technical effect of improving the reliability of the aging and partial discharge test of an oil bath or an electric heating matched sensor, and further solving the problem that the aging and partial discharge testing device in the related technology is implemented in a way of an oil bath or an electric heater matched sensor, the reliability is lower.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of a burn-in and partial discharge test apparatus according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a burn-in and partial discharge test apparatus according to an embodiment of the present invention;
fig. 3 is a graph of PRPD under combined electrical-thermal cycle aging of an on-board high voltage cable terminal according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
According to an aspect of the embodiments of the present invention, there is provided an aging and partial discharge test apparatus, fig. 1 is a schematic diagram of an aging and partial discharge test apparatus according to an embodiment of the present invention, as shown in fig. 1, the aging and partial discharge test apparatus may include: the device comprises a high voltage generation module 11, a temperature and humidity control module 13 and a partial discharge monitoring module 15. The burn-in and partial discharge test apparatus is explained below.
And the high-voltage generation module 11 is used for generating a high-voltage power supply and providing the high-voltage power supply required by the test for the aging object to be tested.
In an alternative embodiment, the high voltage generation module comprises: the power supply is used for providing a working power supply for the aging object to be detected; the voltage regulating platform and the transformer are connected with the power supply and used for regulating a working power supply provided by the power supply into a high-voltage power supply required by an aging object to be measured; and the high-voltage bushing is arranged at the top of the test box, so that a high-voltage power supply is applied to the aging object to be tested through the high-voltage bushing.
Optionally, the transformer may be a partial discharge-free transformer.
The above-mentioned high voltage generation module, i.e., the high voltage platform, may include: the transformer Y without partial discharge can realize variable voltage of 0-150 kV; the voltage regulation precision is 0.01 kV; the protective resistor R is 10k omega; the voltage division ratio of the voltage division capacitor C is 1: 1000, parts by weight; the high-voltage bushing is arranged at the top of the test box, and the aging voltage is applied to the test object through the high-voltage bushing.
In an alternative embodiment, the high voltage generation module comprises: and one end of the protection resistor is connected with the transformer, and the other end of the protection resistor is connected with the capacitive voltage divider and used for collecting a high-voltage power supply passing through the protection resistor.
In an alternative embodiment, the protection resistor has a resistance of 10k Ω, and the voltage division ratio of the capacitive divider is 1: 1000.
therefore, in an embodiment of the present invention, the high voltage generation module may include: the device comprises a power supply, a transformer, a protective resistor, a digital voltage regulating platform, a voltage dividing capacitor and a high-voltage bushing. Wherein, the transformer without partial discharge can realize the voltage transformation of 0-150 kV; the voltage regulation precision is 0.01 kV; the protective resistor is 10k omega; the capacitance voltage division ratio is 1: 1000, parts by weight; the high-voltage bushing is arranged at the top of the test box, and the aging voltage is applied to the test object through the bushing.
And the temperature and humidity control module 13 is used for controlling the temperature and humidity required by the aging object to be tested during testing.
Optionally, in the embodiment of the present invention, the temperature and humidity control module is disposed in the test box, the temperature adjustment range is-50 ℃ to 150 ℃, the temperature control precision is 0.5 ℃, the temperature rise speed is 3 ℃/min, and the temperature drop speed is 1 ℃/min.
In an optional embodiment, the humidity control range of the temperature and humidity control module is 20% to 98%, and the humidity control precision is 3%.
Optionally, in the embodiment of the invention, the test box can realize the adjustable temperature of-50-150 ℃, and the temperature control precision is 0.5 ℃; the average heating rate is 3 ℃/min, and the cooling rate is 1 ℃/min; the controllable range of the humidity is 20% -98%, and the control precision is 3%. By setting the aging modes, the constant-temperature aging, the cold-hot cycle aging and the combined aging with humidity and voltage can be realized, and 10 aging modes are provided in total. Automatic aging can be realized through the aging time and the cycle number setting; the test box display screen can reflect the aging condition in real time.
And the partial discharge monitoring module 15 is configured to detect a partial discharge signal of the to-be-tested aging object at the temperature and humidity provided by the high-voltage power supply and the temperature and humidity control module provided by the high-voltage generation module, so as to obtain an aging and partial discharge test result of the to-be-tested aging object.
In this embodiment, the partial discharge monitoring section includes a partial discharge meter, PC. The partial discharge instrument is connected with the PC end, so that real-time online monitoring of partial discharge data can be realized, and partial discharge signals in the aging process can be synchronously detected.
It should be noted that the aging and partial discharge testing device can be applied to the aging research of rubber, plastic products and high-voltage equipment insulation and the on-line monitoring of partial discharge.
Therefore, in the embodiment of the invention, the high-voltage generation module can be used for generating the high-voltage power supply which is used for providing the high-voltage power supply required by the test for the aging object to be tested; then, controlling the temperature and the humidity required by testing the aging object to be tested by using a temperature and humidity control module; and the local discharge monitoring module is used for detecting the local discharge signals of the aging object to be detected under the temperature and humidity provided by the high-voltage power supply and the temperature and humidity control module provided by the high-voltage generation module to obtain the aging and partial discharge test result of the aging object to be detected, so that the high-voltage generation module, the temperature and humidity control module and the local discharge monitoring module are integrated together, the aging and partial discharge signal detection can be synchronously integrated, the purpose of real-time online monitoring of the aging sample partial discharge signal in the aging process is carried out, and the technical effect of improving the reliability of the aging and partial discharge test of the oil bath or electric heating matched sensor is achieved.
Therefore, the aging and partial discharge testing device provided by the embodiment of the invention solves the technical problem that the aging and partial discharge testing device in the related technology is implemented in a way of an oil bath or an electric heater matched sensor, and has lower reliability.
In an alternative embodiment, the partial discharge monitoring module comprises: the partial discharge instrument detects a partial discharge signal of an aging object to be detected in a pulse current mode; and the terminal equipment is connected with the partial discharge instrument and used for displaying the partial discharge signal and processing the partial discharge signal so as to obtain the aging and partial discharge test result of the aging object to be tested.
In an alternative embodiment, the detection time precision of the partial discharge instrument is 2ns, and the sampling rate is 64 MS/s.
In the embodiment, the partial discharge monitoring module consists of a partial discharge instrument and a PC, and a pulse current method is adopted to detect a partial discharge signal; the partial discharge instrument can realize real-time uninterrupted acquisition with 2ns time precision and 64MS/s sampling rate; the PC (namely, the terminal equipment) is connected with the partial discharge instrument, and the partial discharge data is displayed on the PC in real time.
In an alternative embodiment, a height-adjustable insulating support is arranged in the test chamber and used for fixing the aging object to be tested.
In addition, in the embodiment of the invention, the test box body is provided with a control panel with a display, and can be used for setting aging time, aging temperature, aging humidity, cycle times and buffer time after the set temperature is reached; the box body is provided with a glass window, so that the aging condition can be observed in real time.
Further, for the ageing of the inhomogeneous or longer sample of length of convenient size, open test box one side has two diameters 300mm, a diameter 50 mm's round hole, and the great round hole of ageing position accessible gets into the incasement, and the less round hole of earth connection line or other wire accessible inserts.
In an alternative embodiment, the burn-in and partial discharge test apparatus has at least one of the following test functions: constant temperature aging test, cold-hot cycle aging test, electrical aging test, wet-hot aging test, wet-electrical aging test, wet-cold-hot cycle aging test, electrical-hot aging test, electrical-cold-hot cycle aging test, electrical-wet-hot aging test, and electrical-wet-cold-hot cycle aging test.
Fig. 2 is a circuit diagram of an aging and partial discharge testing apparatus according to an embodiment of the present invention, as shown in fig. 2, 101 provides an operating power supply for a power supply to an aging object to be tested; 102 is a digital voltage regulating platform used for regulating a working power supply; 103, a transformer is connected with the digital voltage regulating platform 102 and is used for regulating a working power supply together; 104 is a protective resistor, and the resistance value of the protective resistor is 10k omega; 105 is a voltage-dividing capacitor for monitoring voltage; 106 is a high-voltage bushing which is arranged at the top of the test chamber, and aging voltage is applied to a test object through the high-voltage bushing; 107 is a programmable constant temperature and humidity test chamber; 108 are holes; 109 is an insulating bracket for fixing a test object; 110 is a partial discharge instrument, a pulse current method is adopted to detect partial discharge signals, and the partial discharge instrument can realize real-time uninterrupted acquisition with 2ns time precision and 64MS/s sampling rate; and 111, a terminal device (for example, a PC) is connected with the partial discharge instrument, so that partial discharge data can be displayed on the terminal device in real time.
Fig. 3 is a PRPD spectrogram under combined electrical-thermal cycle aging of a vehicle-mounted high-voltage cable terminal according to an embodiment of the present invention, and partial discharge and aging can be observed clearly and intuitively through fig. 3.
Therefore, in the embodiment of the invention, the aging and partial discharge testing device is controlled by the high-voltage platform, the test box and the partial discharge monitoring system; wherein, high-pressure platform includes: the transformer Y without partial discharge can realize variable voltage of 0-150 kV; the voltage regulation precision is 0.01 kV; the protective resistor R is 10k omega; the voltage division ratio of the voltage division capacitor C is 1: 1000, parts by weight; the high-voltage bushing is arranged at the top of the test box, and the aging voltage is applied to the test object through the high-voltage bushing. The test box can realize the adjustable temperature of-50 ℃ to 150 ℃, and the temperature control precision is 0.5 ℃; the average heating rate is 3 ℃/min, and the cooling rate is 1 ℃/min; the controllable range of the humidity is 20% -98%, and the control precision is 3%. Has the functions of constant temperature aging, cold and hot cycle aging, electric aging, wet-heat aging, wet-electric aging, wet-cold and hot cycle aging, electric-heat aging, electric-cold and hot cycle aging, electric-wet-heat aging and electric-wet-cold and hot cycle aging.
In addition, in the embodiment of the invention, the test box body is provided with a control panel with a display, and can be used for setting aging time, aging temperature, aging humidity, cycle times and buffer time after the set temperature is reached; the box body is provided with a glass window, so that the aging condition can be observed in real time.
Furthermore, in the embodiment of the invention, in order to facilitate the aging of the sample with uneven size or longer length, two circular holes with the diameter of 300mm and one circular hole with the diameter of 50mm are formed on one side of the box body of the test box, the aging part can enter the box through the larger circular hole, and a grounding wire or other wires can enter the box through the smaller circular hole.
Namely, in the embodiment of the invention, the temperature and humidity control part consists of a programmable constant temperature and humidity test box, a heat insulation plug and a fixed bracket. The inner space of the aging box is 1.2 x 1.5m, and a safety distance of 0.5m is reserved between the high-voltage end of the sleeve and the periphery of the box body; 2 round holes with the diameter of 300mm and the diameter of 50mm are formed in the side surface of the box body, and are matched with heat insulation plugs; and an insulating support with adjustable height is arranged in the box.
Therefore, with the aging and partial discharge testing device provided by the embodiment of the invention, an aging mode, an aging time, an aging temperature, an aging humidity or an aging cycle number and a buffer duration after reaching a preset temperature are set through the test box; adjusting the aging voltage required by the test object through a voltage adjusting table; the partial discharge instrument is calibrated, partial discharge data of an aging object are synchronously acquired through the partial discharge monitoring system and displayed on the PC terminal in real time, and the partial discharge instrument has the advantages of multiple aging functions, wide application range, simplicity and convenience in test operation, safety, reliability, obvious aging effect, accurate partial discharge detection data and the like: 1) can realize 10 aging modes such as constant temperature aging, cold-heat cycle aging, electric aging, wet-heat aging, electric-cold-heat cycle combined aging and the like, and has various aging functions; the aging temperature and voltage range is large, the control precision is high, and the heat insulation effect of the test box is good; 2) the aging space is large, and the aging device is suitable for the efficient aging of test objects with long length or uneven size such as high-voltage cables and insulators; the aging can be automatically controlled, and the aging condition can be observed in real time through the display screen; 3) the aging and partial discharge signal detection integrated function is achieved, and real-time online monitoring of partial discharge signals of an aging sample can be achieved.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An aging and partial discharge test device, comprising:
the high-voltage generation module is used for generating a high-voltage power supply and providing the high-voltage power supply required by the test for the aging object to be tested;
the temperature and humidity control module is used for controlling the temperature and the humidity required by the test of the aging object to be tested;
the partial discharge monitoring module is used for detecting the partial discharge signals of the high-voltage power supply, the temperature and the humidity provided by the temperature and humidity control module, which are provided by the high-voltage generation module, of the aging object to be tested so as to obtain the aging and partial discharge test results of the aging object to be tested.
2. The aging and partial discharge test device according to claim 1, wherein the high voltage generation module comprises:
the power supply is used for providing a working power supply for the aging object to be detected;
the voltage regulating platform and the transformer are connected with the power supply and used for regulating a working power supply provided by the power supply into a high-voltage power supply required by the aging object to be detected;
and the high-voltage bushing is arranged at the top of the test box, so that the high-voltage power supply is applied to the object to be aged through the high-voltage bushing.
3. The aging and partial discharge test device according to claim 2, wherein the high voltage generation module comprises: and one end of the protection resistor is connected with the transformer, and the other end of the protection resistor is connected with the capacitive voltage divider and used for collecting a high-voltage power supply passing through the protection resistor.
4. The aging and partial discharge testing device according to claim 3, wherein the protection resistor has a resistance of 10k Ω, and the voltage division ratio of the capacitive voltage divider is 1: 1000.
5. the aging and partial discharge testing device according to claim 1, wherein the temperature and humidity control module is disposed in the testing box, the temperature adjusting range is-50 ℃ to 150 ℃, the temperature control precision is 0.5 ℃, the temperature rising speed is 3 ℃/min, and the temperature falling speed is 1 ℃/min.
6. The aging and partial discharge testing device according to claim 1, wherein the humidity control module has a humidity control range of 20% to 98% and a humidity control accuracy of 3%.
7. The aging and partial discharge test device of claim 1, wherein the partial discharge monitoring module comprises:
the partial discharge instrument detects a partial discharge signal of the aging object to be detected in a pulse current mode;
and the terminal equipment is connected with the partial discharge instrument and used for displaying the partial discharge signal and processing the partial discharge signal so as to obtain the aging and partial discharge test result of the aging object to be tested.
8. The aging and partial discharge testing device of claim 7, wherein the partial discharge instrument has a detection time accuracy of 2ns and a sampling rate of 64 MS/s.
9. The aging and partial discharge test device according to claim 2, wherein a height-adjustable insulating support is disposed in the test chamber for fixing the aging object to be tested.
10. The burn-in and partial discharge test device according to any one of claims 1 to 9, wherein the burn-in and partial discharge test device has a test function of at least one of: constant temperature aging test, cold-hot cycle aging test, electrical aging test, wet-hot aging test, wet-electrical aging test, wet-cold-hot cycle aging test, electrical-hot aging test, electrical-cold-hot cycle aging test, electrical-wet-hot aging test, and electrical-wet-cold-hot cycle aging test.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113156288A (en) * | 2021-05-12 | 2021-07-23 | 西南交通大学 | Vehicle-mounted cable terminal partial discharge detection device and method thereof |
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