CN108896797B - Insulator flashover back surface current measuring device and control method thereof - Google Patents
Insulator flashover back surface current measuring device and control method thereof Download PDFInfo
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- CN108896797B CN108896797B CN201810600377.9A CN201810600377A CN108896797B CN 108896797 B CN108896797 B CN 108896797B CN 201810600377 A CN201810600377 A CN 201810600377A CN 108896797 B CN108896797 B CN 108896797B
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- 238000000034 method Methods 0.000 title claims abstract description 35
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 39
- 230000033001 locomotion Effects 0.000 claims abstract description 23
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 239000012530 fluid Substances 0.000 claims abstract description 6
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- 229910001369 Brass Inorganic materials 0.000 claims description 15
- 239000010951 brass Substances 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 239000004677 Nylon Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
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- 239000012535 impurity Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention belongs to the field of high-voltage direct current flashover measurement, and particularly relates to a device for measuring surface current after insulator flashover and a control method thereof, wherein the device comprises the following components: the basin-type insulator, the high-voltage lead-in end, the equalizing ring, the metal tank body, the electrode group, the ammeter connecting fluid, the ammeter, the motion guide rod and the ground wire; the method comprises the following steps: 1) Forming a booster circuit of the insulator sample 8 to be tested; 2) Performing a constant-speed boosting process until the insulator sample to be tested enters a flashover process; 3) After the flashover process is completed, a measuring loop is formed; 4) And monitoring the surface current of the insulator sample to be tested after flashover in real time and accurately. The invention can isolate the ammeter in the boosting process and the flashover occurrence process, and prevent the ammeter from being damaged or inaccurate in reading caused by the instant large current generated in the measuring loop when flashover occurs.
Description
Technical Field
The invention belongs to the field of high-voltage direct current flashover measurement, and particularly relates to a device for measuring surface current after insulator flashover and a control method thereof.
Background
Due to the popularization of the high-voltage direct-current transmission line, the basin-type insulator and the pillar insulator in the gas-insulated closed switch equipment are used as main isolation and support components, and the basin-type insulator and the pillar insulator act together with insulating gas to ensure the safe and reliable operation of the equipment. However, the occurrence of a flashover along the surface caused by the existence of a gas-solid interface poses a great threat to the safety of the equipment, and more serious charge accumulation under the action of a direct current electric field can pose more serious challenges, wherein the insulating material belongs to an insulating medium which cannot be recovered, and the damage to the insulating material caused by the surface discharge can cause insulation failure. It is necessary to study the problem of flashover along the surface of the insulator under the action of dc voltage.
The current of pA class can not be measured by the common ammeter in the prior art, but only the precise ammeter can measure the current after flashover, but when flashover happens, a great amount of current is generated at the moment that the insulator is broken down by the surface to form a circuit, so that the accuracy of the measuring instrument is influenced, even the measuring instrument can not work normally, and permanent damage is caused.
Disclosure of Invention
The present invention provides a device for measuring a surface current after an insulator flashover, which is characterized by comprising: the basin-type insulator, the high-voltage lead-in end, the equalizing ring, the metal tank body, the electrode group, the ammeter connecting fluid, the ammeter, the motion guide rod and the ground wire;
a hole is formed in the middle of the basin-type insulator, and an internal thread is arranged on the hole;
the basin-type insulator is arranged above the metal tank body, is connected and sealed with the metal tank body through bolts, nuts and sealing rings, and has an axis coincident with the central axis of the metal tank body;
the high-voltage lead-in end is a metal cylinder, the upper end of the high-voltage lead-in end is provided with external threads which are matched with the internal threads of the holes of the basin-type insulator, and the lower end of the high-voltage lead-in end is provided with external threads;
the high-voltage introducing end is introduced from a hole of the basin-type insulator, the upper end of the high-voltage introducing end is in threaded connection with the hole and fixed, and the central axis of fluid of the high-voltage introducing end coincides with the central axis of the basin-type insulator;
the upper end of the high-voltage introduction end is connected with an external boost circuit;
the upper end of the equalizing ring is provided with an internal thread which is adapted to the external thread at the lower end of the high-pressure introducing end;
the upper end of the equalizing ring is in threaded connection with the lower end of the high-pressure introducing end and is fixed; the lower end of the equalizing ring is a circular plane;
the electrode group is internally provided with an insulator sample to be tested;
the electrode group moves upwards and is separated from the ammeter connecting electrode to be contacted with the equalizing ring, so that the electrode group, the high-voltage introducing end and the external boosting circuit form a boosting circuit of an insulator sample to be tested;
the electrode group moves downwards and is separated from the equalizing ring and contacted with the ammeter connecting electrode, so that the electrode group and the ammeter form a measuring loop;
the motion guide rod is provided with external threads at the upper end of a long cylinder and is connected with the electrode group; the lower end of the electrode group penetrates through the bottom of the metal tank body and can drive the electrode group to move up and down;
the ammeter connecting electrode is a metal cuboid;
the left end of the ammeter connecting electrode is welded at three fifths of the height of the outer wall of the metal tank body, and the right end of the ammeter connecting electrode corresponds to the electrode group; the left end of the current meter is connected with the current meter;
the ammeter is connected with a ground wire.
The metal tank body is made of iron, the inner diameter of the metal tank body is 350mm, the height of the metal tank body is 300mm, and the maximum bearable pressure is 0.6MPa; the basin-type insulator is a 252kV direct-current basin-type insulator, and the basin-type insulator is made of epoxy resin.
The ammeter adopts a Keithley-6514 type electrometer.
The horizontal length of the ammeter connecting electrode is 200mm, and the ammeter connecting electrode is made of brass; the high-pressure introducing end and the motion guide rod of the equalizing ring are made of brass.
The parts of the ammeter connecting electrode except the contact part of the right end of the ammeter connecting electrode and the high-voltage electrode are coated with insulating layers; the insulating coating is made of polytetrafluoroethylene.
The electrode group includes: the insulator comprises a high-voltage electrode, an insulator sample to be tested, a low-voltage electrode, an insulator bracket and an insulator;
the high-voltage electrode is in a T shape, and the electrode group moves upwards, so that the upper surface of the straight area of the high-voltage electrode is contacted with the lower surface of the equalizing ring; the electrode group moves downwards, so that the lower surface of the straight area of the high-voltage electrode is contacted with the ammeter connecting electrode;
the lower I-shaped area of the high-voltage electrode is a vertical guide rod, the upper end of the vertical guide rod is welded with the central axis of the I-shaped area, and the lower end of the vertical guide rod is provided with an internal thread;
the upper end of the needle electrode is provided with an external thread which is matched with the internal thread of the high-voltage electrode;
the lower end of the needle electrode is a needle point;
the low-voltage electrode is made of brass, and the upper end of the low-voltage electrode contacts with the insulator sample to be tested; the lower end of the screw is cylindrical and is provided with external threads;
the high-voltage electrode and the low-voltage electrode are tightly connected with the insulator sample to be tested through an insulator bracket; the high-voltage electrode passes through the upper end of the insulator bracket; the low-voltage electrode passes through the lower end of the insulator bracket; the upper end and the lower end of the insulator bracket are respectively provided with an adjusting bolt for fixing the high-voltage electrode and the low-voltage electrode at any positions;
the upper end of the insulating part is provided with an internal thread which is matched with the external thread at the lower end of the low-voltage electrode; the lower end of the movable guide rod is provided with an internal thread which is matched with the external thread at the upper end of the movable guide rod and is in threaded connection with the movable guide rod.
The transverse length of the upper I-shaped area of the high-voltage electrode is one half of the diameter of the bottom of the metal tank body, and the high-voltage electrode is made of brass; the needle electrode is made of tungsten steel; the insulator bracket is made of an acrylic plate; the insulating piece is made of nylon.
The lower end of the needle electrode is a needle point, the curvature radius of the needle electrode is 0.8mm, and the needle electrode forms an included angle of 45 degrees with the insulator sample to be tested and is in close contact with the insulator sample to be tested.
The upper end of the low-voltage electrode is rectangular with round chamfers on the same side, a non-chamfer part of the low-voltage electrode contacts with the insulator sample to be tested, and a chamfer part of the low-voltage electrode is arranged in the gas of the metal tank body.
The control method of the insulator flashover back surface current measuring device adopts the insulator flashover back surface current measuring device and comprises the following steps:
step 1, the electrode group is controlled by the motion guide rod to move upwards, and then the electrode group is separated from the ammeter connecting electrode until the electrode group contacts with the equalizing ring, so that the electrode group, the high-voltage introducing end and the external boosting circuit form a boosting circuit of an insulator sample to be tested;
step 2, performing a uniform-speed boosting process on the insulator sample to be tested through a boosting loop until the insulator sample to be tested enters a flashover process;
step 3, after the flashover process is finished, the electrode group is controlled to move downwards by the movement guide rod and then is separated from the equalizing ring until the electrode group is contacted with the ammeter connecting electrode, so that the electrode group and the ammeter form a measuring loop;
and 4, accurately monitoring the surface current of the insulator sample to be tested after flashover in real time.
The invention has the beneficial effects that:
the invention provides a device for measuring the surface current after insulator flashover and a control method thereof, which can isolate an ammeter in the boosting process and the flashover occurrence process, and prevent the ammeter from being damaged or inaccurate in reading caused by instantaneous large current generated in a measuring loop when flashover occurs; after the flashover process is finished, carrying out real-time monitoring measurement on the surface current of the insulator sample to be tested;
the invention adopts the Keithley-6514 type electrometer, has flexible interface performance, has better current sensitivity, resolution and speed than other electrometer and ammeter, has the speed of 1200 readings/second, can accurately monitor the surface current value at each moment after flashover, and solves the problems that the surface current after flashover is very tiny and extremely difficult to accurately measure.
The method has the advantages of simple operation, accurate data, high safety and good practical value.
Drawings
Fig. 1 is a schematic structural diagram of a device for measuring a surface current after an insulator is flashover according to an embodiment of the present invention;
FIG. 2 is a schematic view of the structure of the electrode set contacting the ammeter connecting electrode according to the embodiment of the present invention;
fig. 3 is a schematic structural diagram of the needle electrode and the low voltage electrode according to an embodiment of the present invention.
In the figure: 1. basin-type insulator; 2. a high pressure introduction port; 3. equalizing rings; 4. a metal can; 5. a high voltage electrode; 6. the ammeter is connected with the electrode; 7. an ammeter; 8. an insulator sample to be tested; 9. an insulator support; 10. a low voltage electrode; 11. an insulating member; 12. a motion guide rod; 13. a ground wire; 14. a needle electrode; 15. and (5) adjusting a bolt.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides a device for measuring surface current after insulator flashover, as shown in fig. 1, comprising: the device comprises a basin-type insulator 1, a high-voltage lead-in end 2, a grading ring 3, a metal tank 4, an electrode group, an ammeter connecting electrode 6, an ammeter 7, a motion guide rod 12 and a ground wire 13;
the metal tank body 4 is used for isolating from the outside, is made of iron, has an inner diameter of 350mm and a height of 300mm, and can bear the maximum pressure of 0.6MPa;
the basin-type insulator 1 is a 252kV direct-current basin-type insulator 1, and the basin-type insulator is made of epoxy resin; the middle part of the hollow body is provided with a hole, and the hole is provided with internal threads; the basin-type insulator 1 is arranged above the metal tank body 4, is connected and sealed with the metal tank body 4 through bolts, nuts and sealing rings, and has an axis coincident with the central axis of the metal tank body 4;
the high-voltage introducing end 2 is a metal cylinder, is made of brass, is provided with external threads which are matched with the internal threads of the holes of the basin-type insulator 1 at the upper end, and is provided with external threads at the lower end; the high-voltage introducing end 2 is introduced from a hole of the basin-type insulator 1, the upper end of the high-voltage introducing end is in threaded connection with the hole and fixed, and the central axis of fluid of the high-voltage introducing end 2 coincides with the central axis of the basin-type insulator 1; the upper end of the high-voltage introduction end 2 is connected with an external boost circuit and is used for providing a boost function for the device;
the equalizing ring 3 is made of brass, and is provided with an internal thread at the upper end thereof, and is adapted to an external thread at the lower end of the high pressure introducing end 2; the upper end of the equalizing ring 3 is in threaded connection with and fixed with the lower end of the high-pressure introducing end 2; the lower end of the equalizing ring 3 is a circular plane; the equalizing ring 3 is used for preventing electrode tip discharge, and enlarging the contact area with the high-voltage electrode 5 of the electrode group, so that the device can operate more reliably;
the motion guide rod 12 is a long cylinder, and is made of brass, and is used for supporting and fixing the electrode group; the upper end of the electrode is provided with external threads which are connected with the electrode group; the lower end of the electrode group penetrates through the bottom of the metal tank body 4 and can drive the electrode group to move up and down, and the electrode group is connected with a motion control mechanism;
the motion control mechanism is controlled by an operator, and controls the electrode group to move up and down through the motion guide rod 12;
the ammeter connecting electrode 6 is a metal cuboid, the horizontal length is 200mm, and the ammeter connecting electrode is made of brass; the left end of the ammeter connecting electrode 6 is welded at three fifths of the height of the outer wall of the metal tank body 4, and the upper corner of the right end corresponds to the position of the high-voltage electrode 5, namely the contact part with the high-voltage electrode 5, and is used for contacting with the electrode group; the parts of the ammeter connecting electrode 6 except the contact part of the right end of the ammeter connecting electrode and the high-voltage electrode 5 are coated with insulating layers so as to prevent gas breakdown from occurring between the ammeter connecting electrode and the high-voltage electrode 5 in the boosting process and influence the experimental result; the left end of the current meter is connected with the ammeter 7;
the insulating coating is made of polytetrafluoroethylene;
the ammeter 7 is connected with a ground wire 13 and adopts a Keithley-6514 type electrometer;
the electrode group is internally provided with an insulator sample 8 to be tested;
the electrode group moves upwards and is separated from the ammeter connecting electrode 6 until contacting with the equalizing ring 3, as shown in fig. 1, so that the electrode group, the high-voltage introducing end 2 and an external boosting circuit form a boosting circuit of the insulator sample 8 to be tested, and the boosting circuit is used for carrying out a uniform-speed boosting process on the insulator sample 8 to be tested until the insulator sample 8 to be tested enters a flashover process;
the electrode group moves downwards and is separated from the equalizing ring 3 until contacting with the ammeter connecting electrode 6, as shown in fig. 2, so that the electrode group and the ammeter 7 form a measuring loop, and the surface current of the insulator sample 8 to be measured after flashover is monitored accurately in real time;
the electrode group includes: the high-voltage electrode 5, an insulator sample 8 to be tested, an insulator bracket 9, a high-voltage electrode 10, an insulator 11, a needle electrode 14 and an adjusting bolt 15;
the high-voltage electrode 5 is of a T shape, is made of brass, the transverse length of the upper part of the high-voltage electrode is one half of the diameter of the bottom of the metal tank body 4, and is made of brass; the electrode group moves upwards, so that the upper surface of the straight area of the high-voltage electrode 5 is contacted with the lower surface of the equalizing ring 3; the electrode group moves downwards, so that the lower surface of the straight area of the high-voltage electrode 5 is contacted with the ammeter connecting electrode 6;
the lower I-shaped area of the high-voltage electrode 5 is a vertical guide rod, the upper end of the vertical guide rod is welded with the central axis of the I-shaped area, and the lower end of the vertical guide rod is provided with an internal thread;
the needle electrode 14 is made of tungsten steel, and is provided with external threads at the upper end thereof, and is matched with the internal threads of the high-voltage electrode 5; the lower end of the needle electrode 14 is a needle point, the curvature radius of the needle electrode is 0.8mm, and the needle electrode forms an included angle of 45 degrees with the insulator sample 8 to be tested and is in close contact with the insulator sample 8 to be tested, as shown in fig. 3;
polishing, alcohol wiping and drying the insulator sample 8 to be tested to ensure that the surface of the insulator sample is smooth and free of impurities; the insulator sample 8 to be tested adopted in the embodiment is an epoxy resin composite material;
as shown in fig. 3, the low-voltage electrode 10 is made of brass, and the upper end of the low-voltage electrode contacts the insulator sample 8 to be tested; the lower end of the screw is cylindrical and is provided with external threads; the upper end of the low-voltage electrode 10 is rectangular with round chamfers on the same side, a non-chamfer part of the low-voltage electrode contacts the insulator sample 8 to be tested, and a chamfer part of the low-voltage electrode is arranged in the gas of the metal tank body 4 and is used for preventing tip discharge caused by overhigh local field intensity;
the high-voltage electrode 5 and the high-voltage electrode 10 are tightly connected with the insulator sample 8 to be tested through an insulator bracket 9; the high-voltage electrode 5 passes through the upper end of the insulator bracket 9; the low-voltage electrode 10 passes through the lower end of the insulator bracket 9;
the insulator bracket 9 is made of an acrylic plate; the upper end and the lower end of the insulator bracket 9 are respectively provided with an adjusting bolt 15 for fixing the high-voltage electrode 5 and the low-voltage electrode 10 at any position so as to realize the adjustment of the distance between the high-voltage electrode 5 and the low-voltage electrode 10, thereby controlling the contact tightness degree of the insulator and the high-voltage electrode 5 and the low-voltage electrode 10;
the insulating member 11 is made of nylon, and is used for isolating the low-voltage electrode 10 from the motion guide rod 12; an internal thread is arranged at the upper end of the insulating part 11 and is matched with an external thread at the lower end of the low-voltage electrode 10; the lower end of the motion guide rod 12 is provided with an internal thread which is matched with an external thread at the upper end of the motion guide rod 12 and is in threaded connection with the motion guide rod 12.
The control method of the insulator flashover back surface current measuring device adopts the insulator flashover back surface current measuring device and comprises the following steps:
step 1, the electrode group is controlled by the motion guide rod 12 to move upwards and then is separated from the ammeter connecting electrode 6 until contacting with the equalizing ring 3, so that the electrode group, the high voltage introducing end 2 and an external boosting circuit form a boosting circuit of the insulator sample 8 to be tested;
step 2, performing a uniform-speed boosting process on the insulator sample 8 to be tested through a boosting loop until the insulator sample 8 to be tested enters a flashover process;
step 3, after the flashover process is completed, the electrode group is controlled by the motion guide rod 12 to move downwards and then separated from the equalizing ring 3 until contacting with the ammeter connecting electrode 6, so that the electrode group and the ammeter 7 form a measuring loop;
and 4, accurately monitoring the surface current of the insulator sample 8 to be tested after flashover in real time.
The invention provides a device for measuring the surface current after insulator flashover and a control method thereof, which can isolate an ammeter in the boosting process and the flashover occurrence process, and prevent the ammeter from being damaged or inaccurate in reading caused by instantaneous large current generated in a measuring loop when flashover occurs; after the flashover process is completed, carrying out real-time monitoring measurement on the surface current of the insulator sample 8 to be tested;
the invention adopts the Keithley-6514 type electrometer, has flexible interface performance, has better current sensitivity, resolution and speed than other electrometer and ammeter, has the speed of 1200 readings/second, can accurately monitor the surface current value at each moment after flashover, and solves the problems that the surface current after flashover is very tiny and extremely difficult to accurately measure.
The method has the advantages of simple operation, accurate data, high safety and good practical value.
Claims (10)
1. A device for measuring surface current after insulator flashover, comprising: the basin-type insulator, the high-voltage lead-in end, the equalizing ring, the metal tank body, the electrode group, the ammeter connecting fluid, the ammeter, the motion guide rod and the ground wire;
a hole is formed in the middle of the basin-type insulator, and an internal thread is arranged on the hole;
the basin-type insulator is arranged above the metal tank body, is connected and sealed with the metal tank body through bolts, nuts and sealing rings, and has an axis coincident with the central axis of the metal tank body;
the high-voltage lead-in end is a metal cylinder, the upper end of the high-voltage lead-in end is provided with external threads which are matched with the internal threads of the holes of the basin-type insulator, and the lower end of the high-voltage lead-in end is provided with external threads;
the high-voltage introducing end is introduced from a hole of the basin-type insulator, the upper end of the high-voltage introducing end is in threaded connection with the hole and fixed, and the central axis of fluid of the high-voltage introducing end coincides with the central axis of the basin-type insulator;
the upper end of the high-voltage introduction end is connected with an external boost circuit;
the upper end of the equalizing ring is provided with an internal thread which is adapted to the external thread at the lower end of the high-pressure introducing end;
the upper end of the equalizing ring is in threaded connection with the lower end of the high-pressure introducing end and is fixed; the lower end of the equalizing ring is a circular plane;
the electrode group is internally provided with an insulator sample to be tested;
the electrode group moves upwards and is separated from the ammeter connecting electrode to be contacted with the equalizing ring, so that the electrode group, the high-voltage introducing end and the external boosting circuit form a boosting circuit of an insulator sample to be tested;
the electrode group moves downwards and is separated from the equalizing ring and contacted with the ammeter connecting electrode, so that the electrode group and the ammeter form a measuring loop;
the motion guide rod is provided with external threads at the upper end of a long cylinder and is connected with the electrode group; the lower end of the electrode group penetrates through the bottom of the metal tank body and can drive the electrode group to move up and down;
the ammeter connecting electrode is a metal cuboid;
the left end of the ammeter connecting electrode is welded at three fifths of the height of the outer wall of the metal tank body, and the right end of the ammeter connecting electrode corresponds to the electrode group; the left end of the current meter is connected with the current meter;
the ammeter is connected with a ground wire.
2. The device for measuring the surface current after insulator flashover according to claim 1, wherein the metal can body is made of iron, the inner diameter of the metal can body is 350mm, the height of the metal can body is 300mm, and the bearable maximum pressure is 0.6MPa; the basin-type insulator is a 252kV direct-current basin-type insulator, and the basin-type insulator is made of epoxy resin.
3. The post-flashover surface current measurement device according to claim 1, wherein the ammeter is a Keithley-6514 type electrometer.
4. The device for measuring the surface current after insulator flashover according to claim 1, wherein the horizontal length of the ammeter connecting electrode is 200mm, and the ammeter connecting electrode is made of brass; the high-pressure introducing end and the motion guide rod of the equalizing ring are made of brass.
5. The apparatus according to claim 1, wherein the ammeter connecting electrode is coated with an insulating layer except for a portion where a right end thereof contacts the high voltage electrode; the insulating coating is made of polytetrafluoroethylene.
6. The insulator post-flashover surface current measurement device according to claim 1, wherein the electrode set comprises: the insulator comprises a high-voltage electrode, an insulator sample to be tested, an insulator bracket, a low-voltage electrode, an insulator, a needle electrode and an adjusting bolt;
the high-voltage electrode is in a T shape, and the electrode group moves upwards, so that the upper surface of the straight area of the high-voltage electrode is contacted with the lower surface of the equalizing ring; the electrode group moves downwards, so that the lower surface of the straight area of the high-voltage electrode is contacted with the ammeter connecting electrode;
the lower I-shaped area of the high-voltage electrode is a vertical guide rod, the upper end of the vertical guide rod is welded with the central axis of the I-shaped area, and the lower end of the vertical guide rod is provided with an internal thread;
the upper end of the needle electrode is provided with an external thread which is matched with the internal thread of the high-voltage electrode;
the lower end of the needle electrode is a needle point;
the low-voltage electrode is made of brass, and the upper end of the low-voltage electrode contacts with the insulator sample to be tested; the lower end of the screw is cylindrical and is provided with external threads;
the high-voltage electrode and the low-voltage electrode are tightly connected with the insulator sample to be tested through an insulator bracket; the high-voltage electrode passes through the upper end of the insulator bracket; the low-voltage electrode passes through the lower end of the insulator bracket; the upper end and the lower end of the insulator bracket are respectively provided with an adjusting bolt for fixing the high-voltage electrode and the low-voltage electrode at any positions;
the upper end of the insulating part is provided with an internal thread which is matched with the external thread at the lower end of the low-voltage electrode; the lower end of the movable guide rod is provided with an internal thread which is matched with the external thread at the upper end of the movable guide rod and is in threaded connection with the movable guide rod.
7. The device for measuring the surface current after insulator flashover according to claim 6, wherein the transverse length of the upper I-shaped area of the high-voltage electrode is one half of the bottom diameter of the metal can body, and the upper I-shaped area is made of brass; the needle electrode is made of tungsten steel; the insulator bracket is made of an acrylic plate; the insulating piece is made of nylon.
8. The device for measuring the surface current after insulator flashover according to claim 6, wherein the lower end of the needle electrode is a needle tip, the curvature radius of the needle electrode is 0.8mm, and the needle electrode is in 45-degree included angle with the insulator sample to be measured and is in close contact with the insulator sample.
9. The apparatus according to claim 6, wherein the upper end of the low-voltage electrode is rectangular with rounded corners on the same side, the non-chamfered portion thereof contacts the insulator sample to be measured, and the chamfered portion thereof is placed in the gas of the metal can.
10. A control method of a post-flashover surface current measurement device for an insulator, characterized by adopting the post-flashover surface current measurement device for an insulator according to claim 1, comprising the steps of:
step 1, the electrode group is controlled by the motion guide rod to move upwards, and then the electrode group is separated from the ammeter connecting electrode until the electrode group contacts with the equalizing ring, so that the electrode group, the high-voltage introducing end and the external boosting circuit form a boosting circuit of an insulator sample to be tested;
step 2, performing a uniform-speed boosting process on the insulator sample to be tested through a boosting loop until the insulator sample to be tested enters a flashover process;
step 3, after the flashover process is finished, the electrode group is controlled to move downwards by the movement guide rod and then is separated from the equalizing ring until the electrode group is contacted with the ammeter connecting electrode, so that the electrode group and the ammeter form a measuring loop;
and 4, accurately monitoring the surface current of the insulator sample to be tested after flashover in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN116859201B (en) * | 2023-09-05 | 2023-11-17 | 武汉莱恩输变电设备股份有限公司 | Device and method for measuring and detecting surface charge quantity of high-voltage power transmission and transformation insulator |
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