CN113030199A - Epoxy glue impregnated paper sleeve simulated wetting test device and method - Google Patents
Epoxy glue impregnated paper sleeve simulated wetting test device and method Download PDFInfo
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- CN113030199A CN113030199A CN202110401018.2A CN202110401018A CN113030199A CN 113030199 A CN113030199 A CN 113030199A CN 202110401018 A CN202110401018 A CN 202110401018A CN 113030199 A CN113030199 A CN 113030199A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
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- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
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- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
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- G01R27/2694—Measuring dielectric loss, e.g. loss angle, loss factor or power factor
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- 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
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Abstract
The invention discloses a device and a method for simulating a damp test of an epoxy glue impregnated paper sleeve, wherein the device comprises a hollow composite insulator, and cover plates at two ends of the hollow composite insulator can be detached; the tested bushing capacitor core is supported and placed inside the hollow composite insulator by adopting an insulator; one end of a conducting rod of the tested bushing capacitor core is connected with a cover plate at the end part of the hollow composite insulator, so that voltage applied from the outside can be applied to the tested bushing capacitor core; the terminal block is provided with a plurality of mutually insulated conductive connecting terminals and is used for leading out a measured signal of a capacitor core end screen of the tested bushing and a grounding shielding wire from the inside of the sealed hollow composite insulator so as to be connected with insulation parameter testing equipment; an air charging interface, a vacuumizing interface and a moisture measuring interface are arranged on the hollow composite insulator. The invention can measure and analyze various insulation parameters of the tested bushing capacitor core, and master the damp degree and damp characteristic parameters of the bushing core under different trace moisture conditions.
Description
Technical Field
The invention relates to the field of electrical equipment test detection in the field of electricians, in particular to a device and a method for simulating a damp test of an epoxy glue impregnated paper sleeve.
Background
The high-voltage bushing is used for leading a current-carrying conductor into or out of a metal box body or a wall body of a valve hall of equipment with different electric potentials in power transmission and transformation engineering, so that full voltage and full current are led in or out, the high-voltage bushing plays roles of insulation and mechanical support, and is comprehensively influenced by various aspects such as voltage, current, tension, vibration, wind power, atmospheric pollution and the like, factors such as current collection, heat, force, environment and the like act into a whole, the operation condition is extremely harsh, the operation reliability is directly related to the operation safety of a large power grid, and the high-voltage bushing is one of key equipment for ensuring the.
The epoxy resin impregnated paper condenser type sleeve (also called dry type sleeve) taking the cured epoxy resin impregnated insulating paper as main insulation is widely applied to power grid construction due to the characteristics of excellent and stable electrical performance, explosion prevention, flame retardance, small volume, light weight and the like. At present, the epoxy glue impregnated paper condenser type bushing is mainly used for a converter transformer valve side bushing and a direct current wall bushing, and the typical structure of the bushing is shown in figure 1. The glue-impregnated paper capacitor core is connected with the hollow composite insulator through a flange, and SF6 gas with certain pressure is filled in an air cavity between the capacitor core and the hollow composite insulator to serve as auxiliary insulation of the sleeve. One end of a current-carrying guide rod inside the capacitor core is connected with an extension guide rod positioned in the hollow composite insulator, and the extension guide rod is connected with a wiring terminal at the top of the sleeve. The core tail is generally in the transformer oil, and the current-carrying rod tail terminal is used for connecting with a transformer winding. In order to uniform the electric field, a top grading ring is generally installed at the top of the sleeve, and a tail grading ring is installed at the tail of the sleeve.
Because the insulating paper and the epoxy resin have certain water absorption, the epoxy impregnated paper sleeve capacitor core body is easier to absorb moisture in the manufacturing, transportation and operation processes. Meanwhile, due to poor sealing between the hollow composite insulator of the bushing and the capacitor core of the bushing, moisture can enter the bushing. The insulating property of the sleeve pipe is changed due to the damp, and the normal operation of the sleeve pipe is influenced. At present, no effective test detection method and corresponding test device for the faults or defects caused by the sleeve pipe being affected with moisture exist.
Disclosure of Invention
The invention provides a device and a method for simulating a moisture test of an epoxy glue impregnated paper sleeve, in order to simulate the moisture process of the epoxy glue impregnated paper sleeve and the change of the insulation performance after the epoxy glue impregnated paper sleeve is wetted.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides a epoxy soaks paper sleeve pipe simulation test device that wets, includes:
the cover plates at the two ends of the hollow composite insulator can be detached;
the tested bushing capacitor core is supported and placed inside the hollow composite insulator by adopting an insulator; one end of a conducting rod of the tested bushing capacitor core is connected with a cover plate at the end part of the hollow composite insulator, so that an externally applied voltage can be applied to the tested bushing capacitor core;
the terminal block is provided with a plurality of mutually insulated conductive connecting terminals and is used for leading out a measured signal of a capacitor core end screen of the tested bushing and a grounding shielding wire from the inside of the sealed hollow composite insulator so as to be connected with insulation parameter testing equipment;
an inflation interface is arranged on the hollow composite insulator and used for being connected with SF6The air source is connected;
a vacuumizing interface is arranged on the hollow composite insulator and is used for being connected with a vacuum pump,
and a moisture measuring interface is arranged on the hollow composite insulator and is used for being connected with a moisture tester.
Further, at the gas filling interface and SF6The pipeline connected with the air source is also connected with an injector, a valve and a pressure gauge.
Further, the air inflation interface, the vacuumizing interface and the moisture measurement interface are arranged on an end cover plate of the hollow composite insulator connected with the conducting rod of the tested bushing capacitor core.
Furthermore, a gas recovery interface is also arranged on an end cover plate connected with the conducting rod of the tested bushing capacitor core body of the hollow composite insulator and is used for being connected with a gas recovery device; the vacuumizing interface, the moisture measuring interface and the gas recycling interface are integrated into a multifunctional interface.
Furthermore, the end cover plate of the hollow composite insulator, which is not connected with the conducting rod of the tested bushing capacitor core, is directly grounded, and an observation window and a terminal strip are arranged on the end cover plate.
Furthermore, the observation window is made of organic glass and is fixed on the cover plate through a flange with a sealing ring; the terminal block is also fixed on the cover plate through a flange with a sealing ring.
Furthermore, the middle shielding ground of the tested bushing capacitor core is connected to a ground terminal on the terminal strip through a ground wire and is externally connected with the ground wire of the insulation parameter testing equipment, and an end screen measuring wire of the tested bushing capacitor core is connected to an end screen measuring terminal on the terminal strip through a conducting wire with an insulation sheath and is connected with a current signal wire corresponding to the bushing insulation parameter testing equipment;
further, a voltage output line of the insulation parameter testing equipment is connected with the end part of the hollow composite insulator which is not grounded.
Further, the hollow composite insulator is supported by an insulating post insulated from the ground.
A simulation damp test method for an epoxy glue impregnated paper sleeve is carried out by the device, and comprises the following steps:
a step of installing a sleeve capacitor core body:
installing a tested epoxy glue impregnated paper sleeve capacitor core inside a hollow composite insulator, wherein during installation, the hollow composite insulator is supported by an insulating support, a metal cover plate at one end of the hollow composite insulator is disassembled, the sleeve capacitor core is placed inside the hollow composite insulator and is fixed and supported by an insulating part, a conducting rod of the tested sleeve capacitor core is connected with a metal part at the end part of the hollow composite insulator, which is not disassembled from the cover plate, and voltage applied outside can be guaranteed to act on the tested sleeve capacitor core; a shielding grounding wire in the middle of the sleeve capacitor core and a tail screen measuring wire of the sleeve capacitor core are led out from the mounting hole of the wiring terminal row; installing a sealing cover plate at the grounding end part of the hollow composite insulator, connecting a shielding grounding wire in the middle of the sleeve capacitor core with a grounding terminal on a terminal strip, connecting a tail screen measuring wire of the sleeve capacitor core with a tail screen measuring terminal, and fixing the terminal strip on the cover plate through screws after connection is finished;
vacuumizing, inflating and adjusting trace moisture in internal gas:
after the tested bushing capacitor core is installed, connecting a vacuum pump with a multifunctional interface of a testing device, starting the vacuum pump, and continuously vacuumizing the testing device until the internal air pressure of the device is lower than a set value; mixing SF6The gas cylinder is connected with an inflation interface through a gas pipe with a valve and a pressure gauge, and SF is obtained by opening the valve6Filling the gas into the test device until an expected test pressure value is reached;
firstly, recycling a gas part in the test device through a gas recycling device and reducing the internal gas pressure; when the gas is filled again, a certain amount of purified water is injected into the gas filling pipe by using the injector, and the water injection and the gas filling are carried out simultaneously, so that the combination of water and the gas is ensured, and the condensation of water in the test device is avoided; after the air pressure required by the test is recovered, the gas recovery device and the inflation pipeline are removed, and the test device is in a standing state; in the standing process, connecting a gas trace moisture tester with the multifunctional interface, and regularly monitoring the trace moisture content change in the test device; when the sleeve is required to be examined to be affected with moisture in different degrees, water can be injected again according to the method, the micro-water content in the device is determined, and the insulation parameters of the sleeve are measured;
measuring insulation parameters of the bushing after being damped:
after the test device is inflated and kept stand, firstly measuring the trace moisture content of gas in the device, and removing the trace moisture tester after trace moisture measurement is finished; the voltage output line of the insulation parameter testing equipment is connected with the high-voltage end of the testing device, the current testing line is connected with the end screen measuring terminal, the grounding line is connected with the grounding terminal, and the measured insulation parameters comprise insulation resistance, absorption ratio, capacitance, dielectric loss factor and frequency domain dielectric spectrum curve.
Compared with the prior art, the invention has the beneficial effects that:
the invention can measure and analyze various insulation parameters of the tested bushing capacitor core, thereby mastering the moisture degree and the moisture characteristic parameters of the bushing core under different trace moisture conditions.
Drawings
FIG. 1 is a schematic diagram of a typical structure of a conventional epoxy glue impregnated paper sleeve;
fig. 2 is a schematic overall structure diagram of a simulated moisture test device for an epoxy glue impregnated paper sleeve according to an embodiment of the present invention;
in the figure: 1. an insulating support; 2. a hollow composite insulator; 21. a cover plate; 210. an inflation interface; 211. a multifunctional interface; 212. an observation window; 213. a terminal block; 3. a tested bushing capacitor core; 31. a conductive rod; 32. shielding and grounding; 4. SF6 gas cylinders; 5. a valve; 6. a pressure gauge; 7. an injector; 8. insulation parameter testing equipment.
Detailed Description
Example (b):
in the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; the connection can be mechanical connection, electrical connection and signal connection; they may be connected directly or indirectly through intervening media, so to speak, as communicating between the two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
For the insulating properties change after simulation epoxy glue soaks paper sleeve pipe process and the moisture, this embodiment provides a simulation epoxy glue soaks paper sleeve pipe simulation test device that wets.
The overall structure of the test device is shown in fig. 2, in this embodiment, four insulating support columns 1 are used to support two ends of a large-diameter hollow composite insulator 2; the cover plates 21 at the two ends of the hollow composite insulator 2 can be detached; the tested bushing capacitor core 3 is supported by an insulator and placed inside the hollow composite insulator 2, one end of a conducting rod 31 inside the bushing capacitor core 3 is connected with a cover plate 21 at the end part of the hollow composite insulator, and the other end is suspended; the end cover plate 21 of the hollow composite insulator 2 connected with the sleeve capacitor core conducting rod 31 can be directly applied with high voltage, and the cover plate 21 is provided with a gas filling interface 210 and a multifunctional interface 211 with self-sealing functions.
Wherein, the gas charging interface 210 is used for charging SF into the hollow composite insulator6Gas, SF6The gas bottle 4 is connected with an inflation interface 210 through a gas pipe with a valve 5 and a pressure gauge 6, and a small amount of pure water can be slowly injected into the inflation pipe by adopting an injector 7 in order to adjust the content of trace moisture in the gas inside the test device.
The multifunctional interface 211 can be used as a vacuum pumping interface, a moisture measuring interface and a gas recovery interface; the multifunctional interface 211 is used for connecting a vacuum pump to vacuumize the test device, and after the vacuumization and the inflation are finished, the multifunctional interface can be connected with a trace moisture tester and measure the trace moisture content of the gas in the device; after the test is finished, the gas recovery device can be connected with the gas recovery device, and the whole or partial recovery of the gas in the test device is realized.
The end cover plate 21 of the hollow composite insulator 2, which is not connected to the bushing capacitor core conductive rod 31, is directly grounded, and an observation window 212 and a terminal block 213 are provided on the end cover plate 21. Wherein, the observation window 212 is made of organic glass and is fixed on the cover plate 21 through a flange with a sealing ring; the terminal block 213 is also fixed to the cover plate 21 by a flange with a sealing ring, and a plurality of mutually insulated conductive connecting terminals are arranged on the terminal block 213 of the terminal block for leading out a measured signal of a capacitive core end screen of the tested bushing and a grounding shielding wire from the inside of the sealed hollow composite insulator 2.
The central shielding ground 32 of the tested bushing capacitor core is connected to the ground terminal on the terminal block through a ground wire and externally connected with the ground wire of the insulation parameter testing device 8, and the end screen measuring wire of the tested bushing capacitor core is connected to the end screen measuring terminal on the terminal block through a conducting wire with an insulation sheath and connected with the corresponding current signal wire of the insulation parameter testing device 8. The voltage output line of the insulation parameter testing device 8 is connected with the end part of the hollow composite insulator 2 which is not grounded. The insulation parameter testing equipment comprises an insulation resistance tester, a dielectric loss factor tester, an insulation diagnostic instrument and the like, and can be used for measuring and analyzing various insulation parameters including insulation resistance, absorption ratio, capacitance, dielectric loss factor, frequency domain dielectric spectrum curve and the like in the damp process of the tested bushing capacitor core.
Correspondingly, the embodiment also provides a test method based on the test device, which specifically comprises the following steps:
1. tested bushing capacitor core installation
In order to simulate the operating environment of the epoxy glue impregnated paper bushing in the hollow composite insulator, the tested capacitor core of the epoxy glue impregnated paper bushing is installed in the large-diameter hollow composite insulator. During the installation, earlier adopt insulating support to support hollow composite insulator, dismantle hollow composite insulator one end metal cover plate, put into hollow composite insulator inside with the core and fix and support with the insulating part, the cover plate was not dismantled with hollow composite insulator to the bushing electric capacity core conducting rod of being tried is connected with the tip metalwork, guarantees that the external applied voltage can be used to the bushing electric capacity core of being tried. And the shielding grounding wire in the middle of the sleeve capacitor core and the end screen measuring wire of the sleeve capacitor core are led out from the mounting hole of the wiring terminal row. Installing a sealing cover plate at the grounding end part of the hollow composite insulator, connecting a shielding grounding wire in the middle of the core body with a grounding terminal on a terminal strip, connecting an end screen measuring wire of the sleeve capacitor core body with an end screen measuring terminal, and fixing a wiring terminal strip (with a sealing element) on the cover plate through screws after connection is finished.
2. Vacuumizing, aerating and regulating trace moisture in internal gas
After the tested bushing capacitor core is installed, the vacuum pump is connected with the multifunctional interface of the testing device, the vacuum pump is started, and the testing device is continuously vacuumized until the air pressure in the device is lower than 20 pa. An SF6 gas bottle is connected with an inflation interface through a gas pipe with a valve and a pressure gauge, and the valve is opened to fill SF6 gas into the test device until a preset test pressure value is reached.
In order to adjust the trace moisture content in the gas in the test device and simulate the damp of the bushing capacitor core, the gas in the test device is partially recycled and the internal gas pressure is reduced through the gas recycling device. When the gas is filled again, a certain amount of purified water is injected into the gas filling pipe by the injector, the water filling and the gas filling are carried out simultaneously, the injection speed is slow as much as possible, the water and the gas are fully combined, and the moisture is prevented from being condensed in the test device. And after the air pressure required by the test is recovered, removing the gas recovery device and the inflation pipeline, and enabling the test device to be in a standing state. In the standing process, the gas trace moisture tester can be connected with the multifunctional interface, and the trace moisture content change in the testing device is monitored periodically. When the sleeve is required to be examined to be wet in different degrees, water can be injected again according to the method, the micro-water content in the device is determined, and the insulation parameter of the sleeve is measured.
3. Insulation parameter measurement after sleeve pipe is affected with damp
After the test device is inflated and kept still, the content of the trace moisture in the gas in the test device is measured, and the trace moisture tester is removed after trace moisture measurement is finished. The sleeve insulation parameter testing equipment can be various instrument equipment, including an insulation resistance tester, a dielectric loss factor tester, an insulation diagnostic instrument and the like. A voltage output line of the insulation parameter testing equipment is connected with a high-voltage end of the testing device, a current testing line is connected with a tail screen measuring terminal, and a grounding line is connected with a grounding terminal. Insulation parameters that may be measured include insulation resistance, absorption ratio, capacitance, dielectric loss tangent, frequency domain dielectric spectrum curve, and the like.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (10)
1. The utility model provides a epoxy soaks paper sleeve pipe simulation test device that wets which characterized in that includes:
the cover plates at the two ends of the hollow composite insulator can be detached;
the tested bushing capacitor core is supported and placed inside the hollow composite insulator by adopting an insulator; one end of a conducting rod of the tested bushing capacitor core is connected with a cover plate at the end part of the hollow composite insulator, so that an externally applied voltage can be applied to the tested bushing capacitor core;
the terminal block is provided with a plurality of mutually insulated conductive connecting terminals and is used for leading out a measured signal of a capacitor core end screen of the bushing to be tested and a grounding shielding wire from the inside of the sealed hollow composite insulator so as to be connected with insulation parameter testing equipment;
an inflation interface is arranged on the hollow composite insulator and used for being connected with SF6The air source is connected;
a vacuumizing interface is arranged on the hollow composite insulator and is used for being connected with a vacuum pump;
and a moisture measuring interface is arranged on the hollow composite insulator and is used for being connected with a moisture tester.
2. The epoxy impregnated paper bushing simulated moisture test apparatus as claimed in claim 1, wherein said epoxy impregnated paper bushing simulated moisture test apparatus is characterized in thatInflation interface and SF6The pipeline connected with the air source is also connected with an injector, a valve and a pressure gauge.
3. The epoxy glue impregnated paper bushing simulated moisture test device as claimed in claim 1 or 2, wherein the air inflation interface, the vacuum pumping interface and the moisture measurement interface are arranged on an end cover plate of the hollow composite insulator connected with the conductive rod of the tested bushing capacitor core.
4. The simulated moisture test device for the epoxy glue impregnated paper bushing as claimed in claim 3, wherein a gas recovery interface is further arranged on the end cover plate of the hollow composite insulator connected with the conductive rod of the tested bushing capacitive core, and is used for connecting with a gas recovery device; the vacuumizing interface, the moisture measuring interface and the gas recycling interface are integrated into a multifunctional interface.
5. The simulated moisture test device for the epoxy impregnated paper bushing as claimed in claim 4, wherein the end cover plate of the hollow composite insulator not connected with the conductive rod of the tested bushing capacitor core is directly grounded, and the observation window and the terminal strip are arranged on the end cover plate.
6. The epoxy impregnated paper sleeve simulated moisture test device as claimed in claim 5, wherein the observation window is made of organic glass and is fixed on the cover plate through a flange with a sealing ring; the terminal block is also fixed on the cover plate through a flange with a sealing ring.
7. The epoxy glue impregnated paper bushing simulated moisture test device as claimed in claim 6, wherein the capacitor core middle shielding ground of the bushing to be tested is connected to the ground terminal on the terminal block through a ground wire and is externally connected with the ground wire of the insulation parameter test device, and the capacitor core end screen measuring wire of the bushing to be tested is connected to the end screen measuring terminal on the terminal block through a conducting wire with an insulation sheath and is connected with the corresponding current signal wire of the bushing insulation parameter test device.
8. The epoxy glue impregnated paper bushing simulated moisture test device as claimed in claim 1 or 7, wherein a voltage output line of the insulation parameter test equipment is connected with an end of the non-grounded hollow composite insulator.
9. The epoxy impregnated paper bushing simulated moisture test apparatus of claim 1 wherein said hollow composite insulator is supported by an insulating support post insulated from ground.
10. A simulated moisture test method for an epoxy impregnated paper sleeve, the method is carried out based on the device of claim 7, and the method comprises the following steps:
a step of installing a sleeve capacitor core body:
the method comprises the following steps that a tested sleeve capacitor core body is installed inside a hollow composite insulator, during installation, the hollow composite insulator is supported by an insulating support, a metal cover plate at one end of the hollow composite insulator is detached, the tested sleeve capacitor core body is placed inside the hollow composite insulator and is fixed and supported by an insulating part, a conducting rod of the tested sleeve capacitor core body is connected with a metal part at the end part of the hollow composite insulator, wherein the cover plate is not detached, and voltage applied outside can be applied to the tested sleeve capacitor core body; the middle shielding grounding wire of the tested sleeve capacitor core and the end screen measuring wire of the sleeve capacitor core are led out from the mounting hole of the wiring terminal row; installing a sealing cover plate at the grounding end part of the hollow composite insulator, connecting a shielding grounding wire in the middle of the tested bushing capacitor core with a grounding terminal on a terminal strip, connecting a tail screen measuring wire of the tested bushing capacitor core with a tail screen measuring terminal, and fixing a terminal strip on the cover plate through screws after connection is finished;
vacuumizing, inflating and adjusting trace moisture in internal gas:
after the tested bushing capacitor core is installed, the vacuum pump is connected with the multifunctional interface of the testing device, the vacuum pump is started, and the testing device is continuously vacuumized until the inside of the devicePartial air pressure is lower than a set value; mixing SF6The gas cylinder is connected with an inflation interface through a gas pipe with a valve and a pressure gauge, and SF is obtained by opening the valve6Filling the gas into the test device until an expected test pressure value is reached;
firstly, recycling a gas part in the test device through a gas recycling device and reducing the internal gas pressure; when the gas is filled again, pure water is injected into the gas filling pipe by the injector, and the water filling and the gas filling are carried out simultaneously, so that the combination of water and the gas is ensured, and the condensation of water in the test device is avoided; after the air pressure required by the test is recovered, the gas recovery device and the inflation pipeline are removed, and the test device is in a standing state; in the standing process, connecting a gas trace moisture tester with the multifunctional interface, and regularly monitoring the trace moisture content change in the test device; when the sleeve is required to be examined to be affected with moisture in different degrees, water can be injected again according to the method, the micro-water content in the device is determined, and the insulation parameters of the sleeve are measured;
measuring insulation parameters of the bushing after being damped:
after the test device is inflated and kept still, the content of trace moisture in gas in the device is measured firstly, and the moisture tester is removed after the trace moisture measurement is finished; the voltage output line of the insulation parameter testing equipment is connected with the high-voltage end of the testing device, the current testing line is connected with the end screen measuring terminal, the grounding line is connected with the grounding terminal, and the measured insulation parameters comprise insulation resistance, absorption ratio, capacitance, dielectric loss factor and frequency domain dielectric spectrum curve.
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| CN202110401018.2A CN113030199B (en) | 2021-04-14 | 2021-04-14 | Epoxy glue impregnated paper sleeve simulation damp test device and method |
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