CN113625139B - Universal insulating oil insulating strength test device and test method - Google Patents
Universal insulating oil insulating strength test device and test method Download PDFInfo
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- CN113625139B CN113625139B CN202110954579.5A CN202110954579A CN113625139B CN 113625139 B CN113625139 B CN 113625139B CN 202110954579 A CN202110954579 A CN 202110954579A CN 113625139 B CN113625139 B CN 113625139B
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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
- 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
Abstract
The invention provides a device and a method for testing the insulating strength of general insulating oil, which are characterized in that: the method comprises the following steps: the device comprises an electric-thermal insulation test cup, a vacuum, an adjustable high-voltage generator, a magnetic stirrer and a magnetic stirrer; the electric heating insulation test cup is used for containing insulation oil, and two electrodes are arranged in the cup; the vacuum comprises a test chamber and a vacuumizing assembly; the electric heating insulation test cup is arranged in the test cabin; the adjustable high-voltage generator is electrically connected with the electrode; the magnetic stirrer is positioned below the test chamber and used for controlling the stirring action of the magnetic stirrer with the insulating sleeve in the electric-thermal insulating test cup, has the characteristics of being suitable for various viscosities, relatively simple and direct, good comparability and high accuracy, and has remarkable advantages compared with the traditional insulating oil insulating strength test instrument.
Description
Technical Field
The invention relates to the technical field of electric insulating oil insulating strength test devices, in particular to a universal insulating oil insulating strength test device and a universal insulating oil insulating strength test method. The insulating strength test can be carried out on low-viscosity insulating oil and also can be carried out on high-viscosity insulating oil.
Background
The insulating oil needs to be used in a high-voltage and high-magnetic-field environment for a long time, and is required to have certain insulating strength, the strict requirements of different insulating strengths are respectively set according to different voltage grades and different equipment types, and the insulating strength test of the insulating oil is the most important test item in a plurality of test items and is a decisive index of the safe operation of the high-voltage oil-filled equipment of the electric power. The viscosity of the traditional insulation strength test device for the current insulating oil at 40 ℃ is not more than 350mm 2 The low-viscosity insulating oil/s has good adaptability, but a special specific test instrument can be used for carrying out an insulation strength test on high-viscosity insulating oil such as high-viscosity silicon insulating oil, polyisobutylene and the like after special treatment is carried out in advance, tests are often carried out by different treatment methods and different specific test instruments, the deviation is large, the comparability is not strong, the accuracy of a real test result is influenced, and a general test device capable of well integrating low-viscosity and high-viscosity insulating oil insulation strength tests does not exist at present.
The insulating oil is used in the high-voltage oil-filled equipment, mainly plays the roles of insulating, cooling, arc extinguishing and full infiltration of internal components of the oil-filled equipment so as to protect the safe operation of the high-voltage equipment, and the common low-viscosity insulating oil mainly comprises the following components: no. 10, no. 25 and No. 45 transformer oil is mainly applied to high-voltage equipment such as oil-filled main transformers, circuit breakers and the like; the high-viscosity insulating oil mainly comprises silicon insulating oil, polyisobutylene and the like, and is mainly used for high-voltage oil-filled cable terminals, capacitors and other equipment.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, the invention provides a universal insulating oil insulating strength test device and a test method, which are purposefully researched and explored according to the physical and chemical properties and the electrical performance characteristics of insulating oil with various viscosities, so that the test device which is suitable for various viscosities, has relatively simple and convenient performance, good comparability and high accuracy and the corresponding test method are researched, and the test device has obvious advantages compared with the traditional insulating oil insulating strength test instrument.
The insulating oil strength tester can be adjusted according to the physical and chemical properties and the electrical performance of insulating oil with different viscosities so as to meet the requirements of insulating strength tests of the insulating oil with different viscosities.
The invention specifically adopts the following technical scheme:
the utility model provides a general insulating oil dielectric strength test device which characterized in that includes: the device comprises an electric-thermal insulation test cup, a vacuum, an adjustable high-voltage generator, a magnetic stirrer and a magnetic stirrer;
the electric heating insulation test cup is used for containing insulation oil, and two electrodes are arranged in the cup; the electric heating insulation test cup can be heated after being electrified through an assembly provided with a heating wire, and the two electrodes are used for applying voltage after being electrified;
the vacuum comprises a test chamber and a vacuumizing assembly; the electric heating insulation test cup is arranged in the test cabin;
the adjustable high-voltage generator is electrically connected with the electrode;
the magnetic stirrer is positioned below the test chamber and used for controlling the stirring action of the magnetic stirrer with the insulating outer sleeve in the electric-heating insulating test cup.
Furthermore, the electric heating insulation test cup is made of ceramic or glass, and an electric heating wire is embedded in or embedded in the side wall of the electric heating insulation test cup; the two electrodes are oppositely arranged and have adjustable intervals and are respectively connected with one (thin) conducting rod.
Furthermore, the two conducting rods are respectively arranged on the conducting card seat and are provided with scales, the card seat part of the conducting card seat penetrates through and extends into the test chamber, and the other end of the conducting card seat is electrically connected with the adjustable high-voltage generator; and the test chamber is provided with an electric heating wire connecting terminal.
Furthermore, the vacuum pumping assembly adopts a piston vacuum pump structure and comprises a vacuum sensor arranged in the test chamber; wherein, the piston is driven by a variable frequency motor; and the upper part of the test chamber is provided with a chamber cover with a sealing ring.
Further, the adjustable high-voltage generator comprises an array type piezoelectric ceramic high-voltage generator, an array type microelectronic switch and a pressure-sensitive driver; the array type piezoelectric ceramic high-voltage generator comprises a plurality of piezoelectric ceramic high-voltage generators with different calibration values, and each piezoelectric ceramic high-voltage generator is electrically connected with an electrode after being connected with one of the array type microelectronic switches; the pressure-sensitive driver is used for driving the piezoelectric ceramic high-voltage generator.
Further, the electric heating insulation test cup also comprises a temperature sensor arranged in the electric heating insulation test cup and a controller; the temperature sensor, the vacuum sensor, the heating wires, the variable frequency motor, the magnetic stirrer and the adjustable high-voltage generator are respectively connected with the controller.
Furthermore, the controller adopts a PLC or a singlechip and is connected with a time relay.
And a test method according to the test device for the insulation strength of the universal insulating oil, which is characterized in that: when the low-viscosity insulating oil test is carried out, the heating and vacuumizing functions are not used, when the high-viscosity insulating oil test is carried out, the heating function is used for reducing the viscosity of the high-viscosity insulating oil, and the vacuumizing assembly is used for adjusting the vacuum degree in the test cabin and separating out free bubbles in the high-viscosity insulating oil. The fully-closed test chamber and the dynamic pressure adjustment avoid moisture absorption in the insulating oil test process.
Further, the method specifically comprises the following steps:
step A1: checking and adjusting the distance between the two electrodes;
step A2: placing a magnetic stirrer at the bottom of the electric heating insulation test cup;
step A3: pouring low-viscosity insulating oil to be detected into an electric heating insulating test cup, and immersing an electrode;
step A4: placing the electric heating insulation test cup into a test chamber, and electrically connecting the adjustable high-voltage generator with the electrode;
step A5: after standing for a specified time, starting an adjustable high-voltage generator, performing boosting output from the voltage value with the lowest insulation strength until breakdown occurs, and recording the breakdown voltage;
step A6: starting the magnetic stirrer for a given time;
step A7: and repeating the step A5-the step A6 to obtain a plurality of test values.
The method can also comprise the following steps:
step B1: checking and adjusting the distance between the two electrodes;
and step B2: placing a magnetic stirrer at the bottom of the electric heating insulation test cup;
and step B3: pouring high-viscosity insulating oil to be measured into an electric heating insulating test cup, and immersing an electrode;
and step B4: placing the electric heating insulation test cup into a test chamber, and electrically connecting the adjustable high-voltage generator with the electrode; electrically connecting the heating wire with a power supply;
and step B5: electrifying the heating wire to heat the insulating test cup to a set temperature and keep the temperature constant;
and step B6: starting to adjust the vacuum degree in the test chamber to a set value by adopting a vacuumizing assembly;
and step B7: selectively cooling to normal temperature and normal pressure according to test requirements, standing for a specified time, starting the adjustable high-voltage generator, performing boosting output from the voltage value with the lowest insulation strength until breakdown occurs, and recording the breakdown voltage;
and step B8: starting a magnetic stirrer for a given time;
step B9: and repeating the steps B5-B8 to obtain a plurality of test values.
Compared with the prior art, the invention and the optimized scheme thereof have the characteristics of suitability for various viscosities, relative simplicity, good comparability and high accuracy, and have remarkable advantages compared with the traditional insulating oil insulating strength testing instrument.
The method specifically comprises the following steps:
1) When the scheme of the miniature piezoelectric ceramic array high-voltage generator is used for insulating strength tests of various high-viscosity and low-viscosity insulating oils, the breakdown current is extremely small and only has microampere level, the insulating oil punctured by high voltage between high-voltage electrodes basically does not generate free carbon, the original electrical performance of the insulating oil cannot be damaged, and the accuracy and comparability of each insulating strength test are ensured. The traditional insulating oil insulation strength test device uses a voltage regulator to boost voltage, has large breakdown current (more than 10 mA), belongs to destructive tests, generates more free carbon between electrodes, and seriously influences the accuracy and comparability of a withstand voltage test particularly for high-viscosity insulating oil;
2) The designed dynamic balance vacuum can dynamically maintain the vacuum degree of the test chamber, can release free bubbles in the high-viscosity insulating oil, does not cause the insulating oil to bulge due to overlarge vacuum, and is particularly suitable for the insulating strength test of the high-viscosity insulating oil;
3) The designed electric heating insulation test cup is universal for constant-temperature control of high-viscosity insulating oil; the effect of the high-viscosity insulating oil test can be further improved.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic diagram 1 of the overall structure and the working principle of a general insulating oil insulation strength test device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram 2 of the overall structure and the working principle of the general insulating oil insulating strength testing device according to the embodiment of the invention;
FIG. 3 is a schematic view of a dynamic equilibrium vacuum apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an electrothermal insulation test cup according to an embodiment of the present invention (including a cross-sectional view (top) and a top view (bottom));
FIG. 5 is a schematic view of an embodiment of the invention showing a mica electric heating wire embedded between wall layers of an electric-thermal insulation test cup;
FIG. 6 is a schematic diagram of the structure and circuit of an array high voltage generator according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of the array high voltage generator boosting to 70kV electrode breakdown in accordance with an embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating the principle of generating high voltage by pressure sensing of array piezoelectric ceramics according to an embodiment of the present invention;
fig. 9 is a block diagram illustrating the working principle of a control module of the universal insulating oil dielectric strength testing apparatus according to the embodiment of the present invention.
In the figure, 1-test chamber; 2-sealing the hatch cover; 3-a vacuum sensor; 4-negative pole clamping seat; 5-an insulating sleeve; 6-magnetic stirrer; 7-array high voltage generator; 8-a piston cylinder; 9-a piston; 10-a connecting rod; 11-variable frequency drive motor; 12-electric heating insulation test cup; 13-negative pole thin conducting rod; 14-wrapping the magnetic stirring rod with an insulating sleeve; 15-a negative electrode; 16-a positive electrode; 17-insulating oil; 18-mica heating wires; 19-positive thin conducting rod; 20-microelectronic switches (thyristors); 21-piezoelectric ceramics; 22-piezoceramic cathode rare earth copper sheet; 23-positive pole clamping cassette.
Detailed Description
In order to make the features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail as follows:
as shown in fig. 1-9, the overall solution provided in this embodiment mainly includes an electric-thermal insulation test cup 12, a dynamic balance vacuum, an array high-voltage generator, a magnetic stirrer 6, a micro pressure-sensitive driver, and a control module.
As shown in fig. 4, the electric-thermal insulation test cup 12 may be in the form of a hemispherical or rectangular container, as required, the electric-thermal insulation test cup 12 is used for containing insulating oil for performing an insulation strength test, and is made of heatable insulating ceramic or heatable reinforced insulating glass, or other suitable heatable insulating materials, as shown in fig. 5, a mica heating wire 18 (or other suitable heating wires or heating plates) is embedded in an inner layer of a side wall of the electric-thermal insulation test cup, and a joint of the heating wire or the heating plate is led out through the side wall of the electric-thermal insulation test cup 12, so that the cup can be heated after being electrified, and a heating program is controlled by a control module. Two electrodes are installed in the electric heating insulation test cup 12, including a positive electrode 16 and a negative electrode 15, the electric heating insulation test cup 12 can be changed to be in opposite directions, the two electrodes can be used as a positive high-voltage electrode and a negative electrode respectively, the two electrodes are manufactured to be spherical, semicircular, circular plate-shaped and the like according to needs, the distance between the two electrodes can be adjusted to be 2.5mm according to needs, or can be adjusted to be other suitable distances, the two electrodes are connected by respective high-strength thin conductive rods (including a negative thin conductive rod 13 and a positive thin conductive rod 19) (because the high-voltage generator generates very small current in the embodiment, the thin conductive rods are used), the two thin conductive rods respectively penetrate through two ends of the electric heating insulation test cup 12, can be placed in a conductive clamping seat inside the dynamic balance vacuum, and are clamped by a negative clamping seat 4 and a positive clamping seat 23, the conductive rods are provided with scale adjustment, the distance between the two electrodes can be accurately adjusted, the positive high-voltage conductive rod inside the dynamic balance vacuum is electrically connected with the positive electrode of the array high-voltage generator 7 arranged at the lower part of the dynamic balance vacuum, the negative ground is electrically connected with the ground of the array high-voltage generator 7, and the negative electrode is wrapped by other exposed insulating sleeve 5.
The test cup is used for containing insulating oil with various viscosities, the magnetic stirring rod which is wrapped with the insulating sleeve and matched with the magnetic stirrer 6 is placed in the test cup when an insulating strength test is carried out, so that the insulating oil can be stirred, and the electrode, the conducting rod, the clamping base, the connector and other materials of the device are all made of high-quality brass, stainless steel or other suitable materials.
As shown in fig. 3, the dynamic equilibrium vacuum employed in the present embodiment includes: the test chamber comprises a test chamber 1, a negative clamping base 4, a positive clamping base 23, a vacuum sensor 3, a piston cylinder 8, a variable frequency driving motor 11 and the like, wherein the test chamber 1 is connected with the piston cylinder 8, and the pull-pull action of a piston 9 in the piston cylinder 8 provides a vacuum negative pressure environment required by a test for the test chamber 1; the center of the upper part of the test chamber 1 is provided with a chamber cover with a locking seal, so that the sealed chamber cover 2 can be simply opened to release pressure, and the electric heating insulation test cup 12 is tightly covered and sealed after being installed; vacuum sensor 3 is still installed on test chamber 1 upper portion, and test chamber 1 internally mounted has just, the tight cassette of negative pole clamp, just, the tight cassette of negative pole clamp is used for accepting the thin conducting rod of electrode that presss from both sides tight electric heat insulation test cup respectively, and the electrically conductive cassette electric connection of positive high pressure of dynamic balance vacuum ware is installed in the positive pole of dynamic balance vacuum ware lower part array high voltage generator 7, and negative pole clamp cassette electric connection is in the negative pole of array high voltage generator 7, negative pole ground connection. Two heating power line wiring terminals of the electric heating insulation test cup 12 are arranged on the side surface of the test chamber 1 so as to provide power connection for heating the electric heating insulation test cup 12 placed in the test chamber 1; a magnetic stirrer 6 is arranged at the outer side of the bottom of the test chamber 1 and used for driving a magnetic stirring rod 14 with an insulating outer sleeve in an electric-thermal insulating test cup 12 in an air-isolated manner; the piston 9 is driven by a variable frequency motor through a connecting rod 10, the variable frequency motor is controlled by a control module according to a preset programmed program, and the vacuum sensor 3 is used for monitoring the vacuum degree in the test chamber 1.
As shown in fig. 6, the array high voltage generator 7 employed in the present embodiment includes: the array micro piezoelectric ceramic 21 (or other high voltage and low current high voltage generators capable of realizing the high voltage and low current) for the series lattice, the array micro electronic switch 20 for the control loop, the micro pressure-sensitive driver (which can adopt the piezoelectric ceramic driver), and the like, so as to output the accurate 1kV level difference incremental voltage value by the accurate pressure-sensitive piezoelectric ceramic 21, the control loop of the array high voltage generator 7, the integrated block for packaging the integrated circuit for the array micro electronic switch 20, the micro electronic switch can be a thyristor or other circuit micro switch, the positive electrode and the negative electrode of the array high voltage generator 7 are respectively electrically connected with the positive clamping base and the negative clamping base of the test chamber, the negative electrode is grounded, the control loop of the array high voltage generator 7 is electrically connected with the control module, according to different requirements, the number of the array lattices and the voltage incremental amplitude are different, the array high voltage generator can boost from 0kV, each voltage is incrementally increased by 1kV until 70kV (or other required maximum voltage value), or directly boost from 1kV lower than the required minimum insulation strength voltage value, each voltage is incrementally increased by 1kV until 70kV, and a preferred scheme of the lattice is: starting from the voltage of 39kV, each lattice voltage is increased by 1kV and is up to 70kV, the array high-voltage generator 7 is controlled by the control module to increase the lattice voltages one by one according to the interval time (in the embodiment, the lattice voltage is increased by 2kV every second, namely, the lattice voltage is increased by 2kV every second) until the insulating oil is broken down, and the reached lattice voltage is the insulating strength value. Because the output current of the micro piezoelectric ceramic 21 is very small and is only microampere level (the structure and the principle are shown in figure 8, and the micro piezoelectric ceramic comprises the structures such as the piezoelectric ceramic anode copper sheet 22 and the like), compared with the output current of a high-voltage generator of a traditional insulating oil insulation strength test device (more than 10 milliamperes), the micro piezoelectric ceramic insulation strength test device has very low energy when insulating oil is subjected to high-voltage breakdown, basically does not generate free carbon, cannot damage the electrical performance of the insulating oil, can effectively ensure the accuracy and comparability of a voltage withstand test, and is particularly suitable for the voltage withstand test of high-viscosity insulating oil.
As shown in fig. 9, in this embodiment, in order to implement automatic control, the control module may be a single chip or a PLC, which is provided with or connected to a time relay, and automatically controls the test of the universal insulating oil insulation strength testing apparatus according to a preset programmed program, the respective output ends of the vacuum sensor 3 and the temperature sensor for monitoring the temperature in the electric-thermal insulation testing cup 12 are respectively and electrically connected to the input end of the control module, the output end of the control module is respectively and electrically connected to the piezoelectric ceramic 21 of the array high-voltage generator 7, the micro pressure-sensitive driver and the micro-electronic switch of the array high-voltage generator, and the dynamic balance vacuum piston device variable frequency driving motor 11, the electric-thermal insulation testing cup mica heater strip, the magnetic stirrer 6, etc., and the universal control program of the control module includes the following contents:
1. selecting an insulation strength test mode according to the viscosity of the insulating oil to be tested, wherein when the viscosity of the insulating oil to be tested is low, the heating and vacuumizing functions are not applicable, and when the viscosity of the insulating oil to be tested is high, the automatic heating and vacuumizing functions are started;
2. controlling a standing time program before the first pressure resistance test;
3. the dot matrix voltage of the array high-voltage generator is controlled to be increased one by one according to the interval time (the control module is set according to the pressure sensing pressure programming according to each voltage grade in advance, the miniature pressure sensing driver is automatically controlled to apply pressure to the piezoelectric ceramics, the pressure sensing piezoelectric ceramics output accurate 1kV grade difference incremental voltage values), and the program is stopped instantly when the insulating oil is punctured;
4. repeat the test procedure of step 35 times (or N times) as required;
5. interval standing time program after each voltage withstand breakdown test;
6. during a high-viscosity oil test, automatically controlling a piston device of a drawing dynamic balance vacuum according to the monitoring data of a vacuum sensor to maintain a vacuum degree program of a test chamber;
7. and automatically controlling the heating temperature program of the electric heating insulation test cup.
Based on the design of the above general insulating oil dielectric strength test apparatus, the test method provided in this embodiment is specifically as follows:
1. low viscosity insulating oil dielectric strength test
1.1, checking and adjusting the distance between two electrodes 15 and 16 of an electric heating insulation test cup 12 to be 2.5mm (or other required distance);
1.2 carefully placing a clean magnetic rod 14 wrapped with an insulating sleeve at the bottom of an electric heating insulating test cup 12;
1.3, pouring low-viscosity insulating oil 17 into the electric-heating insulating test cup 12 according to requirements, and immersing the electrodes 15 and 16;
1.4 opening a hatch cover 2 of a dynamic balance vacuum test chamber 1, carefully placing an electric heating insulation test cup 12 filled with low-viscosity insulation oil on electrode clamping seats 4 and 23 in the test chamber 1 for clamping;
1.5 covering a cabin cover 2 of the dynamic balance vacuum test cabin and tightly fastening and sealing;
1.6 starting a control module to perform an automatic program control test;
1.7 standing for 5 minutes or after a specific time, automatically starting the array high-voltage generator 7, starting boosting according to a 2kV dot matrix per second from 39kV (or from 0 kV);
1.8, continuously boosting, when the instant that the insulating oil 17 is punctured is reached, automatically controlling and closing the array high-voltage generator 7 by the control module, and simultaneously recording a breakdown voltage value, wherein the breakdown voltage value is the first insulation strength value of the insulating oil 17;
1.9, automatically starting the magnetic stirrer 6, wrapping an insulating sleeve magnetic rod 14 inside and outside the electric heating insulating test cup 12, starting stirring, and stopping stirring a possible trace of free carbon between the electrodes 15 and 16 to avoid influencing the next insulating strength test;
and (3) after standing for at least 2 minutes at 1.10, continuing the pressure resistance test according to the steps of 1.7-1.9, repeating the insulation strength test for 5 times (or N times), and calculating a test value according to requirements, namely the insulation strength value of the low-viscosity insulating oil.
2. High viscosity insulating oil dielectric strength test
2.1, checking and adjusting the distance between the high- voltage electrodes 15 and 16 of the electric heating insulation test cup 12 to be 2.5mm (or other required distances);
2.2 carefully placing the clean magnetic rod 14 wrapped with the insulating sleeve into the bottom of the electric heating insulating test cup 12;
2.3 pouring high-viscosity insulating oil 17 into the electric-heating insulating test cup 12 according to requirements, and immersing the electrodes 15 and 16;
2.4 opening a hatch cover 2 of the dynamic balance vacuum test chamber 1, carefully placing an electric heating insulation test cup 12 filled with high-viscosity insulation oil 17 into a clamping seat of electrodes 4 and 23 in the test chamber 1 for clamping;
2.5 covering a dynamic balance vacuum test cabin cover 2 and tightly fastening and sealing;
2.6 opening a mica heating wire 18 embedded in the wall of the heating insulation test cup 12, and heating the insulation test cup 12 to a set temperature so as to reduce the viscosity of the high-viscosity insulating oil 17 in the cup;
2.7 heating the insulation test cup 12 to a set temperature and keeping the temperature constant;
2.8 starting a piston vacuum device, pulling a piston 9 in a piston cylinder 8 by a variable frequency driving motor 11 through a connecting rod 10, and starting vacuumizing the test chamber 1 until a vacuum setting value is reached so as to ensure that free bubbles in the high-viscosity insulating oil 17 are separated out;
2.9 when the vacuum sensor 3 of the test chamber 1 detects that the vacuum value exceeds the set value, the control module automatically controls the variable frequency driving motor 11, pushes the piston 9 through the connecting rod 10, and compresses in the piston cylinder 8 to reduce the vacuum degree of the test chamber and prevent the high-viscosity insulating oil 17 from being raised by negative pressure due to too high vacuum degree;
2.10 standing for 5 minutes, automatically starting the array high-voltage generator 7, starting to boost voltage according to a 2kV dot matrix per second from 39kV (or from 0 kV);
2.11, continuously boosting, when the high-viscosity insulating oil 17 is punctured, automatically controlling the array high-voltage generator 7 to be closed by the control module, and simultaneously recording a breakdown voltage value, wherein the breakdown voltage value is the first insulation strength value of the high-viscosity insulating oil 17;
2.12 automatically starting the magnetic stirrer 6, starting stirring by wrapping an insulating sleeve magnetic rod 14 inside and outside the electric heating insulating test cup 12, and stopping stirring a possible trace of free carbon between the electrodes 15 and 16 to avoid influencing the next insulating strength test;
2.13 standing for at least 2 minutes, continuing the insulation strength test according to the steps 2.10-2.12, repeating the insulation strength test for 5 times (or N times), calculating a test value according to requirements, namely the insulation strength value of the high-viscosity insulating oil 17, and heating and cooling to room temperature according to requirements for testing.
The present invention is not limited to the above preferred embodiments, and any other various types of apparatus and methods for testing the dielectric strength of insulating oil can be obtained from the teaching of the present invention.
Claims (9)
1. The utility model provides a general insulating oil dielectric strength test device which characterized in that includes: the device comprises an electric-thermal insulation test cup, a vacuum, an adjustable high-voltage generator, a magnetic stirrer and a magnetic stirrer;
the electric heating insulation test cup is used for containing insulation oil, and two electrodes are arranged in the cup;
the vacuum comprises a test chamber and a vacuumizing assembly; the electric heating insulation test cup is arranged in the test cabin;
the adjustable high-voltage generator is electrically connected with the electrode;
the magnetic stirrer is positioned below the test cabin and is used for controlling the stirring action of a magnetic stirrer with an insulating outer sleeve in the electric-heating insulating test cup;
when the low-viscosity insulating oil test is carried out, the heating and vacuumizing functions are not used, when the high-viscosity insulating oil test is carried out, the heating function is adopted for reducing the viscosity of the high-viscosity insulating oil, and the vacuumizing assembly is adopted for adjusting the vacuum degree in the test cabin and separating out free bubbles in the high-viscosity insulating oil.
2. The universal insulating oil dielectric strength test device according to claim 1, characterized in that: the electric heating insulation test cup is made of ceramic or glass, and an electric heating wire is embedded in or embedded in the side wall of the electric heating insulation test cup; the two electrodes are arranged oppositely and have adjustable distance, and the two electrodes are respectively connected with one conducting rod.
3. The universal insulating oil dielectric strength test device according to claim 2, characterized in that: the two conducting rods are respectively arranged on the conducting card holder and are provided with scales, the card holder part of the conducting card holder penetrates through and extends into the test chamber, and the other end of the conducting card holder is electrically connected with the adjustable high-voltage generator; and the test chamber is provided with an electric heating wire connecting terminal.
4. The universal insulating oil dielectric strength test device according to claim 2, characterized in that: the vacuum pumping assembly adopts a piston vacuum pump structure and comprises a vacuum sensor arranged in the test cabin; wherein, the piston is driven by a variable frequency motor; and the upper part of the test chamber is provided with a chamber cover with a sealing ring.
5. The universal insulating oil dielectric strength test device according to claim 1, characterized in that: the adjustable high-voltage generator comprises an array piezoelectric ceramic high-voltage generator, an array microelectronic switch and a pressure-sensitive driver; the array type piezoelectric ceramic high-voltage generator comprises a plurality of piezoelectric ceramic high-voltage generators with different calibration values, and each piezoelectric ceramic high-voltage generator is electrically connected with an electrode after being respectively connected with one of the array type microelectronic switches; the pressure-sensitive driver is used for driving the piezoelectric ceramic high-voltage generator.
6. The universal insulating oil dielectric strength test device according to claim 4, characterized in that: the electric heating insulation test cup also comprises a temperature sensor arranged in the electric heating insulation test cup and a controller; the temperature sensor, the vacuum sensor, the heating wire, the variable frequency motor, the magnetic stirrer and the adjustable high-voltage generator are respectively connected with the controller.
7. The universal insulating oil dielectric strength test device according to claim 6, characterized in that: the controller adopts a PLC or a singlechip and is connected with a time relay.
8. The universal insulating oil dielectric strength test apparatus according to any one of claims 1 to 7, wherein the test method comprises the steps of:
step A1: checking and adjusting the distance between the two electrodes;
step A2: putting a magnetic stirrer at the bottom of the electric heating insulation test cup;
step A3: pouring low-viscosity insulating oil to be detected into an electric heating insulating test cup, and immersing an electrode;
step A4: placing the electric heating insulation test cup into a test chamber, and electrically connecting the adjustable high-voltage generator with the electrode;
step A5: after standing for a specified time, starting an adjustable high-voltage generator, performing boosting output from the voltage value with the lowest insulation strength until breakdown occurs, and recording the breakdown voltage;
step A6: starting the magnetic stirrer for a given duration;
step A7: repeating the steps A5-A6 to obtain a plurality of test values.
9. The universal insulating oil dielectric strength test apparatus according to any one of claims 1 to 7, wherein the test method comprises the steps of:
step B1: checking and adjusting the distance between the two electrodes;
and step B2: putting a magnetic stirrer at the bottom of the electric heating insulation test cup;
and step B3: pouring high-viscosity insulating oil to be detected into an electric heating insulating test cup, and immersing the electrode;
and step B4: placing the electric heating insulation test cup into a test chamber, and electrically connecting the adjustable high-voltage generator with the electrode; electrically connecting the heating wire with a power supply;
and step B5: electrifying the electric heating wire to heat the electric heating insulation test cup to a set temperature and keep the temperature constant;
and step B6: starting a vacuumizing assembly to adjust the vacuum degree in the test chamber to a set value;
and step B7: selectively cooling the test device to normal temperature and normal pressure according to test requirements, standing for a specified time, starting the adjustable high-voltage generator, performing boosting output from the lowest insulation strength voltage value until breakdown occurs, and recording the breakdown voltage;
and step B8: starting the magnetic stirrer for a given duration;
and step B9: and (5) repeating the steps B5-B8 to obtain a plurality of test values.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110954579.5A CN113625139B (en) | 2021-08-19 | 2021-08-19 | Universal insulating oil insulating strength test device and test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110954579.5A CN113625139B (en) | 2021-08-19 | 2021-08-19 | Universal insulating oil insulating strength test device and test method |
Publications (2)
| Publication Number | Publication Date |
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