CN109557439B - Oil paper insulation defect sleeve running condition simulation device - Google Patents

Oil paper insulation defect sleeve running condition simulation device Download PDF

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Publication number
CN109557439B
CN109557439B CN201811569120.8A CN201811569120A CN109557439B CN 109557439 B CN109557439 B CN 109557439B CN 201811569120 A CN201811569120 A CN 201811569120A CN 109557439 B CN109557439 B CN 109557439B
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cavity
capacitor core
electrode
cover plate
electrode clamping
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CN109557439A (en
Inventor
颜海俊
黎大健
张玉波
陈梁远
张磊
余长厅
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Electric Power Research Institute of Guangxi Power Grid Co Ltd
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Electric Power Research Institute of Guangxi Power Grid Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing 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

Abstract

The invention relates to a device for simulating the operation condition of an oil paper insulation defective sleeve, which is used for solving the problems that an effective technical simulation means is generally lacked when the insulation performance change influence is generated when different defects occur to a capacitor core in the oil paper insulation defective sleeve at present, and reliable evaluation analysis cannot be provided for the sleeve with defective operation based on a large number of tests. The device is easy to implement and construct, can meet the requirements of repeated operation and repeated measurement of the sleeve in the study of the insulation state of the defective sleeve, and provides great convenience for workers.

Description

Oil paper insulation defect sleeve running condition simulation device
Technical Field
The invention relates to the technical field of electric power safe operation, in particular to a device for simulating the operation condition of an oil paper insulation defective sleeve.
Background
The oil paper insulating sleeve is an important auxiliary safety device of a large-scale power transformer, plays a role in leading out high and low voltage leads from the inside of the transformer, and realizes the connection of the transformer and an external electrical network and the insulation of the leads to a transformer shell. The most common capacitive bushing in electrical networks is an oil-paper-insulated bushing, the main insulating component of which is an internal capacitor core. The oil paper insulating sleeve is complex in structure and compact in design, and can easily become the weakest link of a transformer insulating system under the conditions of improper installation and design, harsh operating environment and the like. Statistics shows that the proportion of the bushing faults in the faults caused by the transformer accessory defects is up to 35% -45%, and the oiled paper insulation bushing often has the defects caused by the reasons that the insulation of an internal capacitor core is affected with damp, aged, a manufacturing process, an insulation material is poor and the like, so that the insulation performance of the bushing is abnormal, such as insulation reduction, discharge and even insulation breakdown. At present, effective technical simulation means are still generally lacked for the influence of insulation performance change generated when different defects appear on a capacitor core inside an oil paper insulation sleeve, and reliable evaluation and analysis can not be provided for the sleeve with defect operation based on a large number of tests.
Disclosure of Invention
Aiming at the problems, the invention provides a device and a method for simulating the operation condition of an oil paper insulation defective sleeve, which are used for solving the problem that when different defects occur in a capacitor core inside the oil paper insulation defective sleeve, a large number of repeated high-simulation sleeve simulation tests can be carried out through the device.
The oil paper insulation defect sleeve pipe operation condition simulation device is a sleeve pipe operation condition simulation device based on inner and outer cavity structural design, and provides a research platform for operation simulation and state quantity detection for sleeve pipes with different defect types.
The method is realized by adopting the following technical scheme:
a device for simulating the operation condition of an oiled paper insulation defective sleeve comprises an inner cavity, an outer cavity, an electrode clamping groove and a capacitor core;
the inner cavity is arranged in the outer cavity, and the geometric center of the inner cavity is overlapped with that of the outer cavity;
the capacitor core is arranged in the inner cavity;
the electrode clamping grooves penetrate through the slotted holes on the two sides of the outer cavity and the inner cavity respectively and are in contact with the capacitor core, so that support is provided for the inner cavity and the capacitor core, and the inner cavity and the capacitor core are fixed;
the electrode clamping groove connects the outer cavity, the inner cavity and the capacitor core into a whole;
the capacitor core is electrically connected with the wiring terminal on the outer cavity through a top lead and the wiring terminal which penetrate through the inner cavity;
the capacitor core is electrically connected with the outer cavity through a bottom lead penetrating through the inner cavity and a binding post.
Preferably, the inner cavity is a sealed cavity and consists of an inner cavity wall and an inner cavity cover plate and is used for simulating a casing of the sleeve;
an oil valve is arranged on the wall of the inner cavity, and an air valve and a barometer are arranged on the cover plate of the inner cavity; the vacuum pumping and oil filling operations can be realized in the cavity of the inner cavity;
the two sides of the inner cavity wall are provided with electrode clamping groove slotted holes, and the electrode clamping grooves penetrate through the slotted holes;
the bottom of the inner cavity and the inner cavity cover plate are respectively provided with a binding post and are respectively and electrically connected with the capacitance core measuring electrode and the shielding electrode through leads;
the inner cavity wall and the inner cavity cover plate are both made of organic glass, and a sealing washer and a fastening screw are arranged at the contact part of the inner cavity cover plate and the inner cavity wall to seal the inner cavity.
Preferably, the outer cavity is a sealed cavity, consists of an outer cavity wall, a base and an outer cavity cover plate, and is used for manufacturing and simulating the change of the external operating environment of the sleeve;
the wall of the outer cavity is provided with an electric heating belt and a humidifying device; the base is provided with a thermocouple and a detachable bracket; the outer cavity cover plate is provided with a hygrometer, an air valve and an air pressure gauge; the wall of the outer cavity is provided with an electrode clamping groove slotted hole, and the electrode clamping groove penetrates through the slotted hole; the outer cavity cover plate is provided with a through metal screw, and the inner screw fixes the end part of a lead and is used for leading out the measuring end of the capacitor core; the metal base is directly connected with a lead led out from the bottom of the inner cavity and is used for grounding the capacitor core shielding electrode;
the outer cavity wall and the base are made of metal materials, the outer cavity cover plate is made of organic glass, and a sealing gasket and a fastening screw are arranged at the contact position of the outer cavity cover plate and the outer cavity wall to seal the outer cavity.
Preferably, the electrode clamping grooves are metal structure fixing pieces, are formed by lapping two electrode clamping grooves with different sizes, are used for fixing the inner cavity in the outer cavity, fixing the capacitor core in the inner cavity, and are electrically connected with the metal guide rod of the capacitor core to play a role in conducting current and voltage;
a circle of annular polytetrafluoroethylene cushion block is arranged at the contact position of the electrode clamping groove and the outer cavity wall and used for electrically isolating the electrode clamping groove from the metal outer cavity wall.
Preferably, the capacitor core is composed of a metal guide rod, an insulating layer and an annular conductive adhesive tape;
the metal guide rod is contacted with the electrode clamping groove on the inner cavity wall and is led out as a high-voltage electrode through the electrode clamping groove;
the insulating layer adopts insulating oil paper, and different insulating oil paper is replaced according to the defect type to be simulated; a circle of annular conductive adhesive tape is wound at the middle position of the surface of the outermost layer of the insulating layer and is used as a measuring electrode; two sides of the measuring electrode are respectively wound with a circle of annular conductive adhesive tape to be used as a shielding electrode; the metal guide rod and the conductive adhesive tapes in the middle and at two sides form a three-electrode measuring system which is used for carrying out test tests of various insulating state quantities of the sleeve;
the electrode clamping grooves and the metal guide rods of the capacitor core are made of oxygen-free copper materials, the diameter of the metal guide rods of the capacitor core is consistent with the inner diameter of the electrode clamping grooves in the inner cavity wall, and the outer diameter of the electrode clamping grooves in the inner cavity wall is consistent with the inner diameter of the electrode clamping grooves in the outer cavity wall;
preferably, the capacitor core needs to be placed in the inner cavity, vacuum oil injection is carried out, and operation condition simulation is carried out after the capacitor core stands for 72 hours.
The invention has the following characteristics and benefits:
1) the invention provides a simulation device for the operation working condition of an oil paper insulating sleeve with defect operation, and provides an adjustable working condition operation simulation and easily-measured state quantity detection research platform for sleeves with different defect types such as damp, aging, material quality problems, unreasonable structural design and the like;
2) the device adopts an inner cavity and outer cavity combined device structure, is easy to implement and construct, can approximately simulate the steady-state running environment of the casing by adjusting the temperature and humidity of the inner cavity and the outer cavity, and improves the accuracy of the research on the state quantity of the defective casing;
the capacitor core and the insulating oil filled in the inner cavity are easy to replace, and the inner cavity can be vacuumized, dried and cleaned, so that the requirements of repeated operation and repeated measurement of the sleeve during the state quantity detection research of the defective sleeve are met.
Drawings
FIG. 1 is a drawing of the overall design components of the apparatus of the present invention;
FIG. 2 is an isometric view of an electrode card slot of the present invention;
FIG. 3 is a schematic diagram of a capacitance core three-electrode measurement system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 3 in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The detailed description of the embodiments of the present invention generally described and illustrated in the figures herein is not intended to limit the scope of the claimed invention, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figure 1, the oil paper insulation defective sleeve operation condition simulation device is mainly implemented according to the following steps:
(1) structural design of the inventive device
The device comprises an inner cavity 100, an outer cavity 200, an electrode clamping groove 300, a capacitor core 400 and other main components. The inner cavity 100 is a sealed cavity and is used for simulating a casing of a sleeve, and the inside of the cavity can be subjected to vacuum pumping, inflation and oil filling; the outer cavity 200 is a sealed cavity and is used for simulating the change of the external environmental condition of the sleeve; the electrode slot 300 is used for connecting the capacitor core guide rod, fixing the capacitor core and the inner cavity, and leading out as a high-voltage end, and the three views are shown in fig. 2. The diameter of the guide rod of the capacitor core 400 is consistent with the inner diameter of the electrode clamping groove on the wall of the inner cavity, the outer diameter of the electrode clamping groove on the wall of the inner cavity is consistent with the inner diameter of the electrode clamping groove on the wall of the outer cavity, and the positions of the capacitor core and the inner cavity can be fixed.
The inner cavity 100 is composed of an inner cavity wall 101 and an inner cavity cover plate 102. The inner cavity wall and the inner cavity cover plate are both made of high-temperature-resistant organic glass, and a high-temperature-resistant sealing washer 103 and a fastening screw 104 are arranged at the contact part of the inner cavity cover plate and the inner cavity wall, so that the inner cavity body can be sealed. An oil valve 105 is arranged on the wall of the inner cavity, an air valve 106 is arranged on the cover plate of the inner cavity, and the air valve and the oil valve are matched with each other to realize the vacuum oil immersion of the capacitor core. The two sides of the inner cavity wall are provided with electrode clamping grooves 300. The bottom of the inner cavity and the inner cavity cover plate are respectively provided with a binding post 107 which is connected through a copper core wire 108 and used for leading out a measuring end of the capacitor core and a grounding wire. The inner cavity cover plate is provided with a barometer 109 which can monitor the inner air pressure of the inner cavity body in real time.
The outer chamber 200 is composed of an outer chamber wall 201, a base 202 and an outer chamber cover plate 203. The outer cavity wall and the base are made of metal materials, the outer cavity cover plate is made of high-temperature-resistant organic glass, a high-temperature-resistant sealing washer 204 is arranged at the contact position of the outer cavity cover plate and the outer cavity wall, and a fastening screw 205 is arranged to realize the sealing of the outer cavity. The base is provided with a removable bracket 206 to facilitate adjustment and movement of the position of the entire device. An electric heating belt 207 is arranged on the wall of the outer cavity, and a thermocouple 208 is arranged on the base and used for heating and monitoring the internal environment of the outer cavity. The outer cavity wall is provided with a humidifying device 209, and the outer cavity cover plate is provided with a hygrometer 210 for controlling and monitoring the humidity of the inner environment of the outer cavity. An air valve 211 and an air pressure gauge 212 are arranged on the outer cavity cover plate and are used for vacuumizing and controlling and monitoring the air pressure in the outer cavity. The outer cavity wall is provided with an electrode clamping groove 300 which is contacted with the electrode clamping groove on the inner cavity wall and is used for fixing the position of the inner cavity and leading out a high-voltage end. A ring-shaped polytetrafluoroethylene cushion block 213 is arranged at the contact position of the electrode clamping groove and the outer cavity wall and is used for electrically isolating the electrode clamping groove and the metal outer cavity wall. The outer cavity cover plate is provided with a through metal screw 214, the inner side of the outer cavity cover plate can fix the end part of a lead for leading out the measuring end of the capacitor core, and the metal base is directly connected with a grounding wire led out from the bottom of the inner cavity body and used for grounding a shielding electrode of the capacitor core.
The capacitor core 400 is composed 402 of a metal guide 401 and an insulating layer. The metal guide rod is in direct contact with the electrode clamping groove on the inner cavity wall to serve as a high-voltage electrode, a circle of annular conductive adhesive tape 403 is arranged in the middle of the outermost surface of the insulating layer to serve as a measuring electrode, and a circle of annular conductive adhesive tape 404 is arranged on each of two sides of the conductive adhesive tape in the middle to serve as a shielding electrode, as shown in fig. 3. The metal guide rod and the conductive adhesive tapes in the middle and on two sides form a three-electrode system which is used for measuring the leakage current in and on the surface of the insulating layer body of the capacitor core.
(2) Simulation of casing running conditions
The device can simulate the insulation defects of the sleeve by self-designing and putting the capacitor cores with different insulation defect types such as aging, moisture, poor quality of the insulation material, lack of structural design and the like according to the simulation scheme of various working conditions during the actual operation of the sleeve.
Before simulation operation, a capacitor core is placed in an inner cavity, a guide rod of the capacitor core is matched with an electrode clamping groove in the wall of the inner cavity, a cover plate of the inner cavity is covered and fastened, a vacuum pump is connected with an air valve on the cover plate of the inner cavity, the inner cavity is vacuumized, then the air valve is closed, an oil valve is connected with a container filled with dry insulating oil through a guide pipe, the oil valve is opened, the insulating oil is injected into the inner cavity through the air pressure difference between the inner cavity and the external environment, and standing is carried out for 72 hours, so that the vacuum oil immersion of the capacitor core is realized.
Secondly, the humidifying device connected with the outer cavity can change the internal environment humidity of the outer cavity, and the hygrometer is used for monitoring the internal environment humidity in real time, so that the change of the external environment humidity in the operation process of the sleeve can be simulated; the cavity can be integrally heated through the externally wound electric heating belt, and the temperature change in the outer cavity is monitored through the thermocouple, so that the external temperature change in the running process of the sleeve can be simulated; the air inflation or air exhaust treatment can be carried out on the outer cavity through the exhaust valve on the upper cover plate of the outer shell, so that the air pressure change of the sleeve running environments in different altitude areas can be simulated; the sealing degree of the inner cavity is adjusted by controlling the air valve on the upper cover plate of the inner cavity, so that the defect of the sealing property in the running process of the sleeve can be simulated.
After the setting of the external working condition environment is completed through the steps, voltage is integrally applied to the capacitor core and the filling oil in the inner cavity, and therefore the actual running state of the field casing equipment is simulated. The specific implementation steps are as follows: after two ends of a high-voltage guide rod (300 in figure 1) are short-circuited, the high-voltage guide rod is connected with an external high-voltage power supply output end to apply high voltage, the voltage grade is determined according to the test purpose and the insulation of a capacitor core selected in the test (such as 110kV, 220kV, 500kV and the like), and a 214 electrode in figure 1 simulates a flange of a solid sleeve to be grounded.
And keeping the capacitor core and the insulating oil in the inner cavity to continuously apply voltage for a period of time under the set environmental working condition of the outer cavity, thereby realizing laboratory simulation of the live-line operation of the oil-immersed capacitor bushing under various environmental conditions (temperature, humidity, air pressure and the like).
(3) Performing related insulation characteristic quantity test on defective sleeve
After the working condition simulation is finished, the relative insulation characteristic quantity test is carried out on the defective bushing, the test comprises dielectric loss, insulation resistance, partial discharge and power frequency withstand voltage as well as a time/frequency domain dielectric response measurement test, the wiring adopts the wiring mode shown in figure 3, when a three-electrode system is adopted to measure the internal current flowing through the insulation layer of the capacitor core, connecting the high voltage electrode with the voltage output end of the measuring equipment, connecting the measuring electrode with the current input end of the measuring equipment, grounding the shielding electrode, the surface leakage current flowing from the guide rod to the shielding electrode along the surface of the insulating layer can be shielded, the accurate measurement of the current in the insulating layer of the capacitor core can be realized, the wiring is suitable for the measurement test of main insulating dielectric loss, partial discharge, insulation resistance and power frequency withstand voltage in time/frequency domain dielectric response, after the wiring is finished, different measuring equipment is connected according to test requirements to obtain test data so as to achieve various test purposes.
(4) Drying and recycling of equipment
After the ambient humidity measurement is completed, the chamber needs to be dried for the next test. And opening the upper cover plate of the outer cavity, taking out the inner cavity, keeping the outer cavity in an open state, and supplying power to the heating belt. Setting the heating temperature of the heating belt to be 80 ℃, standing for 2h in a dry environment, and wiping the upper cover plate to be in a dry state after taking off if water drops are condensed on the inner side of the disassembled upper cover plate and the outer wall of the inner cavity after taking off the upper cover plate and the outer wall of the inner cavity. After the operation is finished, the device is placed into the inner cavity, and the outer cavity cover plate is covered, so that the device is in a sealed state.

Claims (5)

1. A device for simulating the operation condition of an oiled paper insulation defective sleeve is characterized by comprising an inner cavity, an outer cavity, an electrode clamping groove and a capacitor core;
the inner cavity is arranged in the outer cavity, and the geometric center of the inner cavity is overlapped with that of the outer cavity;
the capacitor core is arranged in the inner cavity;
the electrode clamping grooves penetrate through the slotted holes on the two sides of the outer cavity and the inner cavity respectively and are in contact with the capacitor core, so that support is provided for the inner cavity and the capacitor core, and the inner cavity and the capacitor core are fixed;
the electrode clamping groove connects the outer cavity, the inner cavity and the capacitor core into a whole;
the capacitor core is electrically connected with the wiring terminal on the outer cavity through a top lead and the wiring terminal which penetrate through the inner cavity;
the capacitor core is electrically connected with the outer cavity by a bottom lead penetrating through the inner cavity and a binding post;
the capacitor core consists of a metal guide rod, an insulating layer and an annular conductive adhesive tape;
the metal guide rod is contacted with the electrode clamping groove on the inner cavity wall and is led out as a high-voltage electrode through the electrode clamping groove;
the insulating layer adopts insulating oil paper, and different insulating oil paper is replaced according to the defect type to be simulated; a circle of annular conductive adhesive tape is wound at the middle position of the surface of the outermost layer of the insulating layer and is used as a measuring electrode; two sides of the measuring electrode are respectively wound with a circle of annular conductive adhesive tape to be used as a shielding electrode; the metal guide rod and the conductive adhesive tapes in the middle and at two sides form a three-electrode measuring system which is used for carrying out test tests of various insulating state quantities of the sleeve;
the electrode clamping grooves and the metal guide rods of the capacitor core are made of oxygen-free copper materials, the diameter of the metal guide rods of the capacitor core is consistent with the inner diameter of the electrode clamping grooves in the inner cavity wall, and the outer diameter of the electrode clamping grooves in the inner cavity wall is consistent with the inner diameter of the electrode clamping grooves in the outer cavity wall.
2. The apparatus of claim 1, wherein:
the inner cavity is a sealed cavity and consists of an inner cavity wall and an inner cavity cover plate and is used for simulating a casing of the sleeve;
an oil valve is arranged on the wall of the inner cavity, and an air valve and a barometer are arranged on the cover plate of the inner cavity; the vacuum pumping and oil filling operations can be realized in the cavity of the inner cavity;
the two sides of the inner cavity wall are provided with electrode clamping groove slotted holes, and the electrode clamping grooves penetrate through the slotted holes;
the bottom of the inner cavity and the inner cavity cover plate are respectively provided with a binding post and are respectively and electrically connected with the capacitance core measuring electrode and the shielding electrode through leads;
the inner cavity wall and the inner cavity cover plate are both made of organic glass, and a sealing washer and a fastening screw are arranged at the contact part of the inner cavity cover plate and the inner cavity wall to seal the inner cavity.
3. The apparatus of claim 1, wherein:
the outer cavity is a sealed cavity and consists of an outer cavity wall, a base and an outer cavity cover plate, and is used for manufacturing and simulating the change of the external operating environment of the sleeve;
the wall of the outer cavity is provided with an electric heating belt and a humidifying device; the base is provided with a thermocouple and a detachable bracket; the outer cavity cover plate is provided with a hygrometer, an air valve and an air pressure gauge; the wall of the outer cavity is provided with an electrode clamping groove slotted hole, and the electrode clamping groove penetrates through the slotted hole; the outer cavity cover plate is provided with a through metal screw, and the inner screw fixes the end part of a lead and is used for leading out the measuring end of the capacitor core; the metal base is directly connected with a lead led out from the bottom of the inner cavity and is used for grounding the capacitor core shielding electrode;
the outer cavity wall and the base are made of metal materials, the outer cavity cover plate is made of organic glass, and a sealing gasket and a fastening screw are arranged at the contact position of the outer cavity cover plate and the outer cavity wall to seal the outer cavity.
4. The apparatus of claim 1, wherein:
the electrode clamping grooves are metal structure fixing pieces, are formed by lapping two electrode clamping grooves with different sizes, are used for fixing the inner cavity in the outer cavity, fixing the capacitor core in the inner cavity and are electrically connected with the metal guide rod of the capacitor core, so that the function of conducting current and voltage is exerted;
a circle of annular polytetrafluoroethylene cushion block is arranged at the contact position of the electrode clamping groove and the outer cavity wall and used for electrically isolating the electrode clamping groove from the metal outer cavity wall.
5. The apparatus of claim 1, wherein:
the capacitor core needs to be placed in the inner cavity, vacuum oil injection is carried out, and operation condition simulation is carried out after the capacitor core stands for 72 hours.
CN201811569120.8A 2018-12-21 2018-12-21 Oil paper insulation defect sleeve running condition simulation device Active CN109557439B (en)

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