CN211627432U - Electricity-heat joint ageing and gas decomposition test device - Google Patents
Electricity-heat joint ageing and gas decomposition test device Download PDFInfo
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- CN211627432U CN211627432U CN201921445541.XU CN201921445541U CN211627432U CN 211627432 U CN211627432 U CN 211627432U CN 201921445541 U CN201921445541 U CN 201921445541U CN 211627432 U CN211627432 U CN 211627432U
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Abstract
The utility model relates to a high voltage insulation detects the field, specifically is an ageing and gas decomposition test device of electricity-heat combination, including portable frame, portable frame is equipped with the universal wheel, installs the experimental cavity of decomposition that discharges in portable frame, installs the ageing device of electric heat through the experimental cavity of decomposition that discharges, the ageing device of electric heat is linked together and implements the detection with adopting gas and detecting element, the ageing device of electric heat adopts the high voltage circuit input, and subsidiary temperature heating and conduction equipment, insulating material test article are placed on the ageing device of electric heat to inject gaseous insulating medium and detect in the experimental cavity of decomposition that discharges. The utility model discloses arrange solid organic insulating material in gaseous environment in to the investigation under local high temperature, high field intensity, gaseous decomposition, material electric heat are diagnostic of failures such as joint ageing, realize the joint aassessment of insulating state for solving actual engineering problem.
Description
Technical Field
The utility model relates to a high voltage insulation detects the field, specifically is an ageing and gas decomposition test device of electricity-heat combination.
Background
SF6The gas insulated transmission system is an insulating gas widely applied to transmission lines, but the gas insulated transmission system faces a complex environment under actual operation conditions. When the equipment is in poor contact, magnetic saturation, overload and electricityWhen defects such as resistance loss and dielectric loss or overload faults occur, local overheating of gas insulation equipment can be caused, heat can be generated under the action of current and voltage, abnormal conditions such as current effect and voltage effect, short circuit and point discharge mainly exist, and then latent faults can occur. These latent faults will gradually turn into overheating faults, and in addition to the high field strength effect formed by the voltage in the transmission line, the insulation system will simultaneously bear the effects of high voltage and thermal faults, the physical environment is extremely complex, and the high voltage power equipment will undoubtedly be seriously affected. And a latent fault occurs.
If local overheating occurs in the vicinity of solid insulation material in a gas-insulated device, such as a basin insulator or a support insulator, the insulator is subjected to both high voltage and local high temperature overheating. The strong electric field formed by high voltage has certain promotion effect on the aging of the insulating material under local overheating, and the whole device is in a closed gas environment, so that the whole system is in a more complex multi-physical field. Therefore, the utility model relates to a decomposition device of gas-solid composite insulation system under the effect of electric heat combined aging probes the influence of discharge and local overheating to gas-solid insulation system, and the thermal characteristic of gas decomposition is especially important.
Therefore, it is important to develop a new theory and method capable of reflecting the overheating fault of the gas insulation equipment. These problems are still being explored at present. The utility model aims at the gas decomposition characteristic under the condition of relating to the solid insulating material, but has not been reported about the gas decomposition under the combined action of electric heat and particularly the decomposition characteristic in a gas-solid insulating system.
Meanwhile, the insulation and the discharge of the electric equipment are complex problems of multi-physical field coupling, and relate to a plurality of interdisciplines of electromagnetism, heat transfer, hydrodynamics and the like. Thus, SF6The gas insulation equipment has a relatively complex physical environment under the operation of actual working conditions. In order to master the influence change rule of the decomposition characteristic of gas under multiple physical fields, the utility model discloses to in the gas-solid insulation system, design gas decomposition test device under the combined action of electric heat. In addition, in the actual gas insulation equipment, a trace amount of moisture inevitably exists, so that the device detects the content of the moisture at the same time when in use so as to explore the influence of the moisture on the gas decomposition in the whole gas-solid insulation system. Based on this background, the utility model discloses to the many physics field effect under the electric heat combined action, the influence of many physics field to gas decomposition under the simulation operating condition.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an ageing and gaseous decomposition test device of electricity-heat combination, including portable frame 34, portable frame 34 is equipped with universal wheel 36, installs discharge decomposition test cavity 11 in portable frame 34, installs the electric heat ageing device through discharge decomposition test cavity 11, the electric heat ageing device is linked together and implements the detection with adopting gas and detecting element, the electric heat ageing device adopts the high voltage circuit input, and subsidiary temperature heating and conduction equipment, insulating material test article 7 is placed on the electric heat ageing device to inject gaseous insulating medium and detect in discharge decomposition test cavity 11.
The upper end of the movable rack 34 is attached with a cylinder type mounting rack, and the cylinder type mounting rack is used for mounting a polyformaldehyde insulation sleeve 1, a temperature and humidity sensor 30, a DN50 reserved opening 31 and a DN200 blind flange 32.
The electric heating aging device comprises a high-voltage electrode 2, a ground electrode 8, a heating pipe 3 and a temperature sensor 6, wherein the high-voltage electrode 2 is installed on a polyformaldehyde insulation sleeve 1, the ground electrode 8 is installed on a ground electrode supporting insulation column 9, the heating pipe 3 and the temperature sensor 6 are arranged between the high-voltage electrode 2 and the ground electrode 8, and a binding post 4 of the heating pipe on the heating pipe 3 and the temperature sensor 6 and a binding post 5 of the temperature sensor are connected with a digital display panel 22 of a temperature control system.
A digital display caliper 33 for displaying the height between the high-voltage electrode 2 and the ground electrode 8 is installed in the movable frame 34, and the height between the ground electrode and the high-voltage electrode is adjusted by an adjusting knob 23 arranged on the ground electrode supporting insulation column 9.
The discharge decomposition test cavity 11 is a sealed cavity, and is connected with a gas steel cylinder 15 through a conduit, and an air inlet ball valve 20 for controlling test gas is used as a control end.
The gas production and detection unit comprises a GC gas chromatograph 12, a micro-water meter 13 and a vacuum pump 14, wherein an inlet and outlet ball valve 16 of the gas chromatograph is controlled in a sampling pipeline, an inlet and outlet ball valve 17 of the micro-water meter is controlled in the sampling pipeline, an inlet and outlet ball valve 18 of the vacuum pump is controlled in the sampling pipeline, the GC gas chromatograph 12 is provided, the micro-water meter 13 and the branch control ball valve of the vacuum pump 14 are arranged on a four-way valve 21, and a main gas outlet needle valve 19 is arranged on a connecting pipeline of the discharge decomposition test cavity 11.
The high-voltage circuit input adopts a high-voltage alternating current power supply 24, the high-voltage alternating current power supply 24 is processed by a voltage regulator 25, a test transformer 26, a circuit protection resistor 27, a capacitive voltage divider 28 and a connection circuit of an input circuit protection resistor 29, and is connected with a high-voltage electrode 2 arranged on a polyformaldehyde insulation sleeve 1 through a lead.
The utility model has the advantages that: the utility model discloses gaseous decomposition characteristic under the many physics field of gas insulation high voltage power equipment under the true operating condition of simulation. The gas insulation device is used for solving the actual engineering problems and providing a theoretical basis for engineering technicians to detect gas and eliminate faults. The existing utility model mainly considers the decomposition characteristic of gas under the overheat fault. The utility model discloses arrange solid organic insulating material in gaseous environment in to the investigation under local high temperature, high field intensity, gaseous decomposition, material electric heat are diagnostic of failures such as joint ageing, realize the joint aassessment of insulating state for solving actual engineering problem. The concrete advantages are that:
(1) the method can be used for detecting the decomposition of various gases, has usability aiming at possible decomposition products of different gases and leaves a safety margin.
(2) The high-voltage electrode and the ground electrode can be conveniently replaced, the lower electrode can conveniently adjust the height of the ground electrode, and the height of the lower electrode can be adjusted by a labor-saving bolt by adopting a special structural process design, so that the good air tightness of the cavity can be maintained.
(3) Different insulating materials can be provided to detect the effect of different insulating materials on the gas decomposition components.
(4) The utility model relates to a decomposition device under the combined action of electric heat among the gas-solid insulating system. The combined aging design of gas-solid insulation adopts a special structural design scheme, so that high voltage and local overheating can simultaneously act on a solid insulating material and gas, and the change rule of the influence of the high voltage on the gas decomposition characteristic can be conveniently researched
Drawings
FIG. 1 is a schematic view of the appearance of an electric-thermal combined aging test chamber;
FIG. 2 is a schematic view of a defect setup;
FIG. 3 is a schematic view of a gas collecting and detecting unit in the electric thermal aging apparatus;
FIG. 4 is a schematic diagram of a high pressure input connection;
shown in the figure: a polyformaldehyde insulation sleeve 1, a high-voltage electrode 2, a heating pipe 3, a heating pipe binding post 4, a temperature sensor binding post 5, a temperature sensor 6, an insulation material test product 7, a ground electrode 8, a ground electrode supporting insulation column 9, a gas insulation medium 10, a discharge decomposition test cavity 11, a GC gas chromatograph 12, a micro-water instrument 13, a vacuum pump 14, a gas steel cylinder 15, an inlet and outlet ball valve 16 of the gas chromatograph in a sampling pipeline, an inlet and outlet ball valve 17 of the micro-water instrument in the sampling pipeline, an inlet and outlet ball valve 18 of the vacuum pump in the sampling pipeline, an outlet needle valve 19, an inlet ball valve 20, a four-way valve 21, a digital display panel 22, an adjusting knob 23, a high-voltage alternating current power supply 24, a voltage regulator 25, a test transformer 26, a protective resistor 27, a capacitive voltage divider 28, a protective resistor 29, a temperature and humidity sensor 30, digital display caliper 33, movable frame 34, observation window 35 and universal wheel 36.
Detailed Description
The technical solution of the present invention is further described by the following specific embodiments with reference to the accompanying drawings:
example 1
An electro-thermal combination aging and gas decomposition test apparatus as shown in fig. 1-4, the apparatus comprises four units, which are respectively: the device comprises a voltage input unit, an electric heating combined test/gas decomposition test unit, a gas inlet unit and a gas collection and detection unit, wherein the specific connection structure is as follows.
As shown in fig. 1, the four units all use a movable rack 34 as a mounting base frame, and a cylinder-type mounting rack is arranged at the upper end of the movable rack 34, on which a polyoxymethylene insulating sleeve 1, a temperature and humidity sensor 30, a DN50 reserved opening 31, a DN200 blind flange 32 and an observation window 36 are arranged. Polyformaldehyde insulation support 1 is voltage input unit installation sleeve pipe, and DN50 reserves mouth 31 and is the expansion mouth that other experiments detected, and DN200 blind flange 32 is the removable cover structure for place material etc. and observation window 36 is the equipment viewing aperture as the name implies.
As shown in fig. 4, the voltage input unit adopts a high-voltage ac power supply 24, and the high-voltage ac power supply 24 is processed by a connection circuit of a voltage regulator 25, a test transformer 26, a protection resistor 27 of a circuit, a capacitive voltage divider 28 and a protection resistor 29 of an input circuit, and is connected with the high-voltage electrode 2 mounted on the polyoxymethylene insulating sleeve 1 through a wire.
The combined electric heating test/gas decomposition test unit is installed in the discharge decomposition test chamber 11 as shown in fig. 1, 2 and 3. The high-voltage electrode type temperature control device specifically comprises a high-voltage electrode 2, a ground electrode 8, a heating pipe 3 and a temperature sensor 6, wherein the high-voltage electrode 2 is installed on a polyformaldehyde insulation sleeve 1, the ground electrode 8 is installed on a ground electrode supporting insulation column 9, the heating pipe 3 and the temperature sensor 6 are arranged between the high-voltage electrode 2 and the ground electrode 8, and a binding post 4 of the heating pipe on the heating pipe 3 and the temperature sensor 6 and a binding post 5 of the temperature sensor are connected with a digital display panel 22 of a temperature control system. Meanwhile, a digital display caliper 33 for displaying the height between the high-voltage electrode 2 and the ground electrode 8 is installed in the movable frame 34, and the height between the ground electrode and the high-voltage electrode is adjusted by an adjusting knob 23 arranged on the ground electrode supporting insulation column 9. The insulating material sample 7 is placed on the ground electrode 8, wrapped by the heating pipe 3 and filled with a gas insulating medium in the discharge decomposition test cavity 11 for detection.
The air intake unit is connected with SF6Or the novel insulating substitute gas is connected with a gas steel cylinder 15 through a conduit, and is filled into the discharge decomposition test cavity 11 by taking an air inlet ball valve 20 for controlling the test gas as a control end so as to carry out a gas discharge decomposition test.
The gas production and detection unit is shown in fig. 3, and comprises a GC gas chromatograph 12, a micro-water meter 13 and a vacuum pump 14, wherein an inlet and outlet ball valve 16 for controlling the gas chromatograph is arranged in a sampling pipeline, an inlet and outlet ball valve 17 for controlling the micro-water meter in the sampling pipeline and an inlet and outlet ball valve 18 for controlling the vacuum pump in the sampling pipeline are the GC gas chromatograph 12, and branch control ball valves of the micro-water meter 13 and the vacuum pump 14 are arranged on a four-way valve 21 and are connected with a main gas outlet needle valve 19 arranged on a connecting pipeline of the discharge decomposition test cavity 11.
The specific operation steps are as follows:
the test circuit is checked-to ensure that the test circuit capacitive divider and power supply are in an unpowered state.
And (3) cleaning the test cavity, namely cleaning the interior of the cavity by adopting absolute ethyl alcohol.
The gas discharge decomposition device has two gas inlets and outlets. One of which is a gas inlet 20 for feeding test gas into the apparatus. And the other is an air outlet 19 which is used for collecting, processing and further analyzing the gas after the overheating fault equipment is processed. Wherein the outlet of the outlet needle valve 19 is passed through a stainless steel needle valve to control the inlet and outlet of the gas. The needle valve 19 is followed by a four-way valve to control the gas to be introduced into the gas chromatograph 12 and the micro-water meter 13. Wherein the gas chromatography detects and analyzes the types and the content of the decomposed gas, and the micro-water meter is mainly used for detecting the content of micro-water in the cavity. And the vacuum pump 14 is used for exhausting tail gas in the gas pipeline in each test.
Setting a defect mode under the combined action of electric heating, namely adjusting the high-voltage electrode and the ground electrode to proper heights, taking an epoxy resin insulating piece as a test article, and placing the test article on the ground electrode. A custom-made annular heating tube was placed around the solid insulation to maintain a 5mm distance from the electrode. Meanwhile, the heating pipe is placed on the three pillars of the cavity body and used for fixing the position of the heating pipe. Meanwhile, a customized cylindrical temperature sensor is placed on the heating pipe, so that the side wall of the heating pipe is tightly attached to the heating pipe. The tip of the high-voltage electrode is contacted with the solid insulating part, so that high field intensity generated by voltage acts on the surface of the insulating part, and the insulating part is simultaneously subjected to the action of the high field intensity and local high temperature. After the defects are set, the flange cover of the cavity is closed, and the flange is screwed down by using an electric wrench, so that the sealing performance of the cavity is guaranteed.
And (3) gas washing, namely opening the gas inlet valve 20, filling gas of 1atm into the discharge test cavity, standing for 20 minutes, and opening the vacuum pump 14 to ensure that the cavity is in a vacuum state. The vacuum pump used by the utility model is a large-capacity rotary vane vacuum FXD-16, 4L/s, and the process is circulated for three times continuously to eliminate the influence of other gas impurities on decomposition. (1) SF is pumped by a high precision vacuum pump6The vacuum discharge device is used for vacuumizing, and the precision of the used vacuum pump is higher and can reach below 10 Pa. (2) Charging high-purity SF of 0.1MPa (1atm) into the overheating fault equipment6And (4) washing the gas, and standing for 12 hours until the gas is uniform in the tank body. Vacuumizing again to make the air pressure in the tank body below 30 Pa. The process is continued for 3 times to achieve the purpose of removing impurities from the tank body.
Filling gas-high purity SF of 0.4MPa (4atm) into the tank6Gas to simulate the gas pressure in an actual GIS. Standing for 12 hours, after the airflow in the tank body is stable, turning on the heater, setting different temperature faults, and respectively detecting the gas decomposition components and the change rule along with the time under the different temperature faults. The gas samples were collected and analyzed every hour. When setting the temperature, the starting temperature of the overheat fault was set to 200 ℃ with an interval of 20 ℃. The overheating fault temperature is gradually raised. And detecting at different temperatures, recording the content of the decomposition components, and drawing a changing curve rule. Among them, the gas chromatograph needs to use 99.999% of high-purity helium gas.
Preparation of gas chromatograph-the switch of the gas chromatograph was turned on in advance to preheat it for 2 hours before the experiment was performed.
The heating pipe is switched on to set a certain temperature in the digital display system, so that the heating pipe is in a continuous heating state, and the designed temperature control system can keep the temperature of the surface of the whole heating pipe at a constant temperature. The heating tube temperature was set to 300 ℃ for the initial test. The surface temperature of the heating tube can be kept at 300 +/-2 ℃.
And setting applied voltage, namely keeping the gas in the cavity in a basically stable state after heating for 30 min. The alternating current power supply is turned on to generate alternating current voltage, the alternating current voltage is boosted by the test transformer and passes through a protective resistor 27, and the generated high voltage acts on the high-voltage guide rod in the cavity, so that the action of generating high field intensity at the needle point directly acts on the solid insulating part and the gas. To this end, both solid and gaseous media are subjected to the dual action of high field strengths and local overheating. Samples were taken every 1 h.
Sampling and detecting, namely detecting the gas in the collection cavity in the cavities with different action times. In the test, the ball valve 18 and the vacuum pump 14 are firstly opened, the gas in the pipeline is evacuated, and the ball valve 18 on the pipeline is closed after vacuumizing for 5 min. And meanwhile, the needle valve 19 is opened, so that the gas in the cavity can be conveniently collected. The ball valves 16 and 17 are opened simultaneously. Wherein the ball valve 17 controls the circuit of the micro-water meter, and the ball valve 16 controls the circuit of the gas chromatograph. During sampling, the gas in the cavity is respectively led into a micro-water meter and a gas chromatograph, so that the micro-water content can be measured, and the product type and content of the decomposed gas can be detected. And detecting the collected sample in a gas chromatograph. And then starting the small vacuum pump for the gas in the pipeline to empty the gas remained after the last decomposition of the pipeline and prepare for the next test.
And (4) next step of testing, namely sampling the test process in the step one above every 1h at the beginning of the test respectively. The whole test is carried out for 10 hours of electric-heat combined aging, and gas is collected and detected for 10 times.
And (4) carrying out post-test treatment, namely treating the device after the test is finished. The voltage is removed, and the capacitor, the high-voltage insulator and the like are discharged by a discharge rod. And exhausting the gas in the cavity, and reducing the gas pressure in the tank body to be below 10Pa by turning on the vacuum pump. Then, air is introduced again to wash the cavity. Subsequently, the tank is brought to a normal pressure
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. An electricity-heat is united ageing and gas decomposition test device, includes portable frame, and portable frame is equipped with the universal wheel, its characterized in that: the device is characterized in that a discharge decomposition test cavity is installed in the movable rack, an electric heating aging device is installed in the discharge decomposition test cavity, the electric heating aging device is communicated with the gas production and detection unit and performs detection, the electric heating aging device adopts high-voltage circuit input and is additionally provided with temperature heating and conducting equipment, an insulating material sample is placed on the electric heating aging device, and a gas insulating medium is filled in the discharge decomposition test cavity for detection.
2. An electro-thermal combination weathering and gas decomposition test apparatus as claimed in claim 1, wherein: the portable frame upper end is attached with the cylinder mounting bracket, and the cylinder mounting bracket is used for installing polyformaldehyde insulation support, temperature and humidity sensor, DN50 reservation mouth, DN200 blind flange and observation window.
3. An electro-thermal combination weathering and gas decomposition test apparatus as claimed in claim 1, wherein: the electric heating aging device comprises a high-voltage electrode, a ground electrode, a heating pipe and a temperature sensor, wherein the high-voltage electrode is installed on a polyformaldehyde insulation sleeve, the ground electrode is installed on a ground electrode supporting insulation column, the heating pipe and the temperature sensor are arranged between the high-voltage electrode and the ground electrode, and a binding post of the heating pipe on the heating pipe and the temperature sensor and a binding post of the temperature sensor on the heating pipe and the temperature sensor are connected with a digital display panel of the temperature control system.
4. An electro-thermal combination weathering and gas decomposition test apparatus as claimed in claim 1, wherein: and a digital display caliper for displaying the height between the high-voltage electrode and the ground electrode is installed in the movable rack, and the height between the ground electrode and the high-voltage electrode is adjusted through an adjusting knob arranged on the ground electrode supporting insulating column.
5. An electro-thermal combination weathering and gas decomposition test apparatus as claimed in claim 1, wherein: the discharge decomposition test cavity is a sealed cavity, a gas steel cylinder is connected onto the sealed cavity through a guide pipe, and an air inlet ball valve for controlling test gas is used as a control end.
6. An electro-thermal combination weathering and gas decomposition test apparatus as claimed in claim 1, wherein: the gas production and detection unit comprises a GC gas chromatograph, a micro-water meter and a vacuum pump, wherein an inlet and outlet ball valve of the gas chromatograph is controlled in a sampling pipeline, an inlet and outlet ball valve of the micro-water meter is controlled in the sampling pipeline, an inlet and outlet ball valve of the vacuum pump is controlled in the sampling pipeline, the inlet and outlet ball valve of the vacuum pump is the GC gas chromatograph, and a branch control ball valve of the micro-water meter and the vacuum pump is arranged on a four-way valve and is provided with a total gas outlet needle valve on a connecting pipeline of.
7. An electro-thermal combination weathering and gas decomposition test apparatus as claimed in claim 1, wherein: the high-voltage circuit input adopts a high-voltage alternating current power supply, and the high-voltage alternating current power supply is processed by a voltage regulator, a test transformer, a protection resistor of the circuit, a capacitive voltage divider and a connecting circuit of the protection resistor of the input circuit and is connected with a high-voltage electrode arranged on a polyformaldehyde insulating sleeve through a wire.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921445541.XU CN211627432U (en) | 2019-09-02 | 2019-09-02 | Electricity-heat joint ageing and gas decomposition test device |
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| CN201921445541.XU CN211627432U (en) | 2019-09-02 | 2019-09-02 | Electricity-heat joint ageing and gas decomposition test device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568326A (en) * | 2019-09-02 | 2019-12-13 | 国网甘肃省电力公司电力科学研究院 | Electric-thermal combined aging and gas decomposition test device and application method |
| CN113504440A (en) * | 2021-07-08 | 2021-10-15 | 广东电网有限责任公司 | Environment-friendly gas insulation performance test device with controllable environment working condition |
-
2019
- 2019-09-02 CN CN201921445541.XU patent/CN211627432U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568326A (en) * | 2019-09-02 | 2019-12-13 | 国网甘肃省电力公司电力科学研究院 | Electric-thermal combined aging and gas decomposition test device and application method |
| CN110568326B (en) * | 2019-09-02 | 2022-10-11 | 国网甘肃省电力公司电力科学研究院 | Electric-thermal combined aging and gas decomposition test device and application method |
| CN113504440A (en) * | 2021-07-08 | 2021-10-15 | 广东电网有限责任公司 | Environment-friendly gas insulation performance test device with controllable environment working condition |
| CN113504440B (en) * | 2021-07-08 | 2023-07-04 | 广东电网有限责任公司 | Environment-friendly gas insulation performance test device with controllable environment working conditions |
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