CN113049930A - Electric discharge device and discharge method for direct-current withstand voltage test - Google Patents
Electric discharge device and discharge method for direct-current withstand voltage test Download PDFInfo
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- CN113049930A CN113049930A CN202110297563.1A CN202110297563A CN113049930A CN 113049930 A CN113049930 A CN 113049930A CN 202110297563 A CN202110297563 A CN 202110297563A CN 113049930 A CN113049930 A CN 113049930A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/16—Construction of testing vessels; Electrodes therefor
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Abstract
An electric discharge device and a discharge method for a direct-current withstand voltage test comprise an insulating shell (9), wherein a discharge working cavity is arranged in the insulating shell (9); one end of the insulating shell (9) is provided with a discharge joint, the other end of the insulating shell (9) is provided with a driving device, the driving device is used for driving the discharge resistor (3) to reciprocate, and the discharge resistor (3) and the direct grounding discharge contact (2) are both grounded; the discharge resistor (3) is used for being indirectly conducted with the discharge joint, and the direct grounding discharge contact (2) is used for being directly conducted with the discharge joint. Compared with the traditional discharge device, the buffer type discharge mode is formed in the whole discharge process, and the phenomenon that a large current generates a strong electric arc to cause personal casualty accidents is avoided.
Description
Technical Field
The invention belongs to the field of direct-current withstand voltage test devices, and particularly relates to an electric discharge device and a discharge method for a direct-current withstand voltage test.
Background
Large-scale power equipment such as a generator, a high-voltage power cable and the like has large capacitance to ground, after a direct-current withstand voltage test is completed, the voltage cannot be immediately reduced to 0, and a special discharging rod needs to be used for discharging tested equipment so as to guarantee the safety of personnel and equipment. In the current practice of power production, a manual discharge mode is adopted, so that the danger is high. Due to the technical development, the generator set enters the era of 100 million and ten million, the capacity to the ground is larger, and the discharge time of the traditional manual discharge mode needs more than 10 minutes; due to the characteristic that the capacitor voltage cannot suddenly change, when direct-current withstand voltage equipment suddenly loses control or personnel mistakenly enters a test interval during a direct-current withstand voltage test, large electric arcs are generated during direct grounding, and the safety of discharging personnel is threatened.
The existing discharge devices, such as the "high-voltage test auxiliary discharge device" disclosed in chinese patent document CN201911018613.7 and the "a safe intelligent discharge device" disclosed in CN201720148183.0, do not disclose a technical solution for slowing down the discharge current.
Disclosure of Invention
In view of the technical problems in the background art, the electric discharge device and the electric discharge method for the direct-current withstand voltage test provided by the invention form a buffer type discharge mode in the whole discharge process compared with the traditional discharge device, and avoid the human casualty accident caused by strong electric arc generated by large current.
In order to solve the technical problems, the invention adopts the following technical scheme to realize:
an electric discharge device for a direct-current withstand voltage test comprises an insulating shell, wherein a discharge working cavity is arranged in the insulating shell; one end of the insulating shell is provided with a discharge joint, one end of the discharge joint is positioned in the discharge working cavity, the other end of the discharge joint is positioned in the insulating shell, the other end of the insulating shell is provided with a driving device, the driving device is used for driving the discharge resistor to reciprocate, and the discharge resistor and the direct grounding discharge contact are both grounded; the discharge resistor is used for being indirectly conducted with the discharge joint, and the direct grounding discharge contact is used for being directly conducted with the discharge joint.
In a preferred scheme, the discharge joint is a metal voltage-sharing ball, the top end of the discharge resistor is of a pointed structure, the discharge resistor is in hard connection with the direct grounding discharge contact, and the distance between the discharge resistor and the metal voltage-sharing ball is smaller than that between the direct grounding discharge contact and the metal voltage-sharing ball.
In a preferred embodiment, the resistance of the discharge resistor is not less than 2 megohms.
In the preferred scheme, the discharge resistor is provided with a grounding connector, the grounding connector is in hard connection with the direct grounding discharge contact, and the grounding connector is connected with the ground through a grounding conduction device.
In a preferred embodiment, the ground conduction device includes a soft ground wire, one end of the soft ground wire is connected to the ground connector, and the other end of the soft ground wire is grounded.
In a preferred embodiment, the ground conduction device includes a soft ground wire and a hard ground wire, the bottom end of the hard ground wire is grounded, and the top end of the hard ground wire is connected to the ground connector through the soft ground wire.
In a preferred scheme, the grounding conduction device comprises two hard ground wires, the two hard ground wires are connected through a carbon brush, one hard ground wire is grounded, and the other two hard ground wires are connected with a grounding connector.
In a preferred scheme, the grounding conduction device comprises a soft ground wire, the soft ground wire is wound on a winding wheel, the winding wheel is connected with a support rod through a plurality of springs, the support rod is connected with an upright post, and the upright post is used for grounding; one end of the soft ground wire is connected with the grounding connector, and the other end of the soft ground wire is connected and fixed on the winding wheel rotating drum; the winding wheel rotary drum, the clockwork spring, the supporting rod and the stand column are all conductors.
In a preferred scheme, the driving device comprises an electric push rod and a motor control device, the electric push rod is positioned in the insulating shell, and a telescopic rod of the electric push rod is an insulating rod. The motor control device is used for driving the telescopic rod of the electric push rod to quickly rise or slowly rise.
In a preferred scheme, the insulating shell is of a transparent structure.
In a preferred embodiment, the discharging method of the electric discharge device for the dc withstand voltage test includes the steps of:
s1: before the test, the upper end of the metal pressure equalizing ball is connected with the test side of the direct current pressure-resistant device, and the electric push rod is contracted to the lowest position;
s2: when the test is finished, the discharge operation is performed: operating the discharge resistor to rise by the motor control device; the tip of the discharge resistor gradually approaches the metal voltage-sharing ball, and the electric charge of the tested equipment breaks through air through the metal voltage-sharing ball and is conducted with the tip of the discharge resistor to release the electric charge, so that primary discharge is formed;
along with the reduction of the residual voltage of the tested equipment and the increase of the discharge resistor, the direct grounding discharge contact is in contact with the metal voltage-equalizing ball, the residual voltage of the tested equipment is conducted to the ground through the direct grounding discharge contact, and secondary discharge is formed;
s3: when the test device breaks down at high voltage or people mistakenly enter a test area, the motor control device drives the telescopic rod of the electric push rod to quickly rise, the direct grounding discharge contact is quickly contacted with the metal voltage-sharing ball, and the voltage of a tested product is quickly reduced to zero potential;
s4: and when the test normal discharge is finished, the direct grounding discharge contact is used as a test loop metallic grounding device.
This patent can reach following beneficial effect:
1. when discharging, the motor control device is pressed down to make the tip of the discharging resistor approach the metal voltage-sharing ball gradually, so as to break down air and release electric charge, thus forming a discharge. Along with the reduction of the residual voltage of the tested equipment and the increase of the discharge resistor, the direct grounding discharge contact is in contact with the metal voltage-sharing ball, the residual voltage of the tested equipment is conducted to the ground through the direct grounding discharge contact, and secondary discharge is formed. The discharge resistor is a current-limiting resistor not less than 2 megaohms, so that the discharge current can be reduced in one-time discharge, and the current is prevented from being rapidly released at one time; and after the direct grounding discharge contact is contacted with the metal voltage-equalizing ball, the residual voltage of the test equipment is continuously released until the discharge is finished. Compared with the traditional discharge device, the buffer type discharge mode is formed in the whole discharge process, and the phenomenon that a large current generates a strong electric arc to cause personal casualty accidents is avoided.
2. Soft ground wire can be accomodate to the rolling wheel, and telescopic link when electric putter rises, and the rolling wheel can rotate thereupon, and telescopic link when electric putter descends, and clockwork spring reaction force is down, and the rolling wheel resets, and soft ground wire can be accomodate. The working mode of the winding wheel can avoid knotting of the soft ground wire, collision of the soft ground wire with other equipment and frequent replacement of vulnerable parts.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic view of the present invention in example 1;
FIG. 2 is a schematic view of the present invention in example 2;
FIG. 3 is a schematic view of the present invention in embodiment 3;
FIG. 4 is a schematic view of the present invention in example 4;
FIG. 5 is a schematic view of a wind-up wheel according to the present invention in embodiment 4;
FIG. 6 is a state diagram of the discharge resistance before testing in accordance with the present invention;
FIG. 7 is a state diagram of the discharge resistance during discharge (air between the discharge resistance and the metal voltage-sharing ball is broken down) of the present invention
FIG. 8 is a diagram of the direct discharge state of the present invention.
In the figure: 1-metal pressure equalizing balls; 2-direct grounding of the discharge contacts; 3-a discharge resistor; 4, an electric push rod; 5-motor control line; 6-motor control means; 7-a ground conduction means; 71-soft ground; 72-hard ground; 73-carbon brush; 74-a winding wheel; 75-a support bar; 76-upright post; 8-a ground connection; 9-an insulating housing; 10-the device under test; 11-DC high voltage generator.
Detailed Description
Example 1:
a preferred scheme is as shown in fig. 1, an electric discharge device and a discharge method for a direct current withstand voltage test comprise an insulating shell 9, wherein a discharge working cavity is arranged in the insulating shell 9; one end of the insulating shell 9 is provided with a discharge joint, the other end of the insulating shell 9 is provided with a driving device, the driving device is used for driving the discharge resistor 3 to reciprocate, and the discharge resistor 3 and the direct grounding discharge contact 2 are both grounded; the discharge resistor 3 is used for being indirectly conducted with the discharge joint, and the direct grounding discharge contact 2 is used for being directly conducted with the discharge joint.
The discharge joint is a metal voltage-sharing ball 1, the top end of the discharge resistor 3 is of a pointed structure, the discharge resistor 3 is in hard connection with the direct grounding discharge contact 2, and the distance between the discharge resistor 3 and the metal voltage-sharing ball 1 is smaller than that between the direct grounding discharge contact 2 and the metal voltage-sharing ball 1. When the discharge resistor 3 moves upwards, the discharge resistor 3 first generates point discharge with the metal voltage-sharing ball 1, and the direct grounding discharge contact 2 is contacted with the metal voltage-sharing ball 1 again along with the continuous rising of the discharge resistor 3.
The metal pressure equalizing ball 1 is a smooth stainless steel hollow ball with the radius of 20 mm and the wall thickness of 1 mm; the direct grounding discharge contact 2 is composed of a 6-square-millimeter hard copper wire and a solid copper ball with the radius of 3 mm;
the resistance of the discharge resistor 3 is not less than 2 megaohms.
The discharge resistor 3 is provided with a grounding connector 8, the grounding connector 8 is hard connected with the direct grounding discharge contact 2, and the grounding connector 8 is connected with the ground through a grounding conduction device 7.
The grounding conduction device 7 comprises a soft ground wire 71, one end of the soft ground wire 71 is connected with the grounding connector 8, and the other end of the soft ground wire 71 is grounded. The ground cord 71 is preferably a flexible copper wire with an insulating sheath.
The driving device comprises an electric push rod 4 and a motor control device 6, the electric push rod 4 is positioned in an insulating shell 9, and a telescopic rod of the electric push rod 4 is an insulating rod. The stroke of the electric push rod 4 can be 300 mm, the motor control device 6 is an operator of the electric push rod 4, and the operator comprises an ascending button, a descending button and a quick discharging button, namely a quick ascending button.
The insulating housing 9 is of a transparent construction. The size of the insulating shell 9 is a transparent insulating cylinder with the diameter of 300 mm, the height of 900 mm and the wall thickness of 4 mm;
the working principle is as follows:
as shown in fig. 6-8, in the test, the upper end of the metal voltage-sharing ball 1 of the discharge device is connected to the test side of the dc voltage withstand device, and the electric push rod 4 is retracted to the lowest position. As shown in fig. 1, the device under test 10 is equivalent to a capacitor.
When discharging, the motor control device 6 'rise' button is pressed, the tip of the discharge resistor 3 gradually approaches the metal voltage-sharing ball 1, air is punctured, electric charge is released, and primary discharge is formed. As the residual voltage of the device under test 10 decreases and the discharge resistor 3 increases, the direct grounding discharge contact 2 contacts the metal voltage equalizing ball 1, and the residual voltage of the device under test 10 is conducted to the ground through the direct grounding discharge contact 2, so that secondary discharge is formed. The discharge resistor 3 is a current-limiting resistor not less than 2 megaohms, so that the discharge current can be reduced in one-time discharge, and the current can be prevented from being rapidly released at one time; after the direct grounding discharge contact 2 is contacted with the metal voltage-equalizing ball 1, the residual voltage is continuously released by the test equipment 10 until the discharge is finished. Compared with the traditional discharge device, the buffer type discharge mode is formed in the whole discharge process, and the phenomenon that a large current generates a strong electric arc to cause personal casualty accidents is avoided.
In addition, the 'ascending' button and the 'descending' button in the motor control device 6 are slow gears of the electric push rod, and the quick discharging button in the motor control device 6 is a quick gear of ascending, so that the direct grounding discharging contact 2 can be quickly contacted with the metal pressure equalizing ball 1. The function is as follows: when the test device breaks down under high voltage or a person mistakenly enters a test area, the test person presses a quick grounding button of the discharge device, a telescopic rod of the electric push rod quickly rises, the direct grounding discharge contact 2 is quickly contacted with the metal voltage-equalizing ball 1, and the voltage of a tested product is quickly reduced to zero potential; and secondly, after the discharge is finished normally after the test, the direct grounding discharge contact 2 is used as a test loop metallic grounding device.
Example 2:
on the basis of embodiment 1, another form of the ground conduction device 7 is:
preferably, as shown in fig. 2, the ground conduction device 7 includes a soft ground line 71 and a hard ground line 72, the bottom end of the hard ground line 72 is grounded, and the top end of the hard ground line 72 is connected to the ground connector 8 through the soft ground line 71. In this embodiment, the hard ground wire 72 is disposed, and the copper bar is selected as the hard ground wire 72, so as to avoid the knotting problem caused by the overlong soft ground wire 71.
Example 3:
on the basis of the embodiment 1-2, the grounding conduction device 7 has another form:
as shown in fig. 3, the ground conduction device 7 includes two hard ground wires 72, the two hard ground wires 72 are connected through a carbon brush 73, one hard ground wire 72 is grounded, and the other two hard ground wires 72 are connected to the ground connector 8. The two hard ground wires 72 in this embodiment are connected in a sliding manner, so that the soft copper wires can be prevented from knotting or colliding with the electric push rod 4.
Example 4:
on the basis of embodiments 1 to 3, another form of the ground conduction device 7 is:
as shown in fig. 4-5, the ground conduction device 7 includes a soft ground wire 71, the soft ground wire 71 is wound on a winding wheel 74, the winding wheel 74 is connected to a support rod 75 through a plurality of springs, the support rod 75 is connected to an upright post 76, and the upright post 76 is used for grounding; one end of the soft ground wire 71 is connected with the grounding connector 8, and the other end of the soft ground wire 71 is connected and fixed on the rotating drum of the winding wheel 74; the winding wheel 74 drum, the spiral spring, the supporting rod 75 and the upright post 76 are all conductors.
In embodiment 3, the carbon brush is a consumable and needs to be replaced frequently, the winding wheel 74 in this embodiment can store the soft ground wire 71, when the telescopic rod of the electric push rod ascends, the winding wheel 74 rotates along with the carbon brush, and when the telescopic rod of the electric push rod descends, the winding wheel 74 resets under the reaction force of the spiral spring, and the soft ground wire 71 is stored. The working mode of the winding wheel 74 can avoid knotting of the soft ground wire 71, collision of the soft ground wire 71 with other equipment and frequent replacement of wearing parts. In addition, the soft ground line 71 can be prevented from being electrically connected to the driving device due to the damage of the insulating layer.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention is defined by the claims, and equivalents including technical features described in the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
Claims (10)
1. The utility model provides a direct current withstand voltage test electric discharge device which characterized in that: comprises an insulating shell (9), wherein a discharge working cavity is arranged in the insulating shell (9); one end of the insulating shell (9) is provided with a discharge joint, one end of the discharge joint is positioned in the discharge working cavity, the other end of the discharge joint is positioned in the insulating shell (9), the other end of the insulating shell (9) is provided with a driving device, the driving device is used for driving the discharge resistor (3) to reciprocate, and the discharge resistor (3) and the direct grounding discharge contact (2) are both arranged in a grounding manner; the discharge resistor (3) is used for being indirectly conducted with the discharge joint, and the direct grounding discharge contact (2) is used for being directly conducted with the discharge joint.
2. The electric discharge apparatus for dc withstand voltage test according to claim 1, characterized in that: the discharge joint is a metal voltage-sharing ball (1), the top end of the discharge resistor (3) is of a pointed structure, the discharge resistor (3) is in hard connection with the direct grounding discharge contact (2), and the distance between the discharge resistor (3) and the metal voltage-sharing ball (1) is smaller than the distance between the direct grounding discharge contact (2) and the metal voltage-sharing ball (1).
3. The direct current withstand voltage test electrodynamic discharge apparatus according to claim 1 or 2, characterized in that: the resistance of the discharge resistor (3) is not less than 2 megaohms.
4. The electric discharge apparatus for dc withstand voltage test according to claim 2, characterized in that: the discharge resistor (3) is provided with a grounding connector (8), the grounding connector (8) is in hard connection with the direct grounding discharge contact (2), and the grounding connector (8) is connected with the ground through a grounding conduction device (7).
5. The direct current withstand voltage test electrodynamic discharge apparatus according to claim 4, characterized in that: the grounding conduction device (7) comprises a soft ground wire (71), one end of the soft ground wire (71) is connected with the grounding connector (8), and the other end of the soft ground wire (71) is grounded.
6. The direct current withstand voltage test electrodynamic discharge apparatus according to claim 4, characterized in that: the grounding conduction device (7) comprises a soft ground wire (71) and a hard ground wire (72), the bottom end of the hard ground wire (72) is grounded, and the top end of the hard ground wire (72) is connected with the grounding connector (8) through the soft ground wire (71).
7. The direct current withstand voltage test electrodynamic discharge apparatus according to claim 4, characterized in that: the grounding conduction device (7) comprises two hard ground wires (72), the two hard ground wires (72) are connected through a carbon brush (73), one hard ground wire (72) is grounded, and the other two hard ground wires (72) are connected with the grounding connector (8).
8. The direct current withstand voltage test electrodynamic discharge apparatus according to claim 4, characterized in that: the grounding conduction device (7) comprises a soft ground wire (71), the soft ground wire (71) is wound on a winding wheel (74), the winding wheel (74) is connected with a support rod (75) through a plurality of spiral springs, the support rod (75) is connected with an upright post (76), and the upright post (76) is used for grounding; one end of the soft ground wire (71) is connected with the grounding connector (8), and the other end of the soft ground wire (71) is connected and fixed on the rotating drum of the winding wheel (74); the winding wheel (74) rotating drum, the spiral spring, the supporting rod (75) and the upright post (76) are all conductors.
9. The electric discharge apparatus for dc withstand voltage test according to claim 1, characterized in that: the driving device comprises an electric push rod (4) and a motor control device (6), the electric push rod (4) is positioned in the insulating shell (9), and a telescopic rod of the electric push rod (4) is an insulating rod; the insulating shell (9) is of a transparent structure; the motor control device (6) is used for driving the telescopic rod of the electric push rod (4) to quickly rise or slowly rise.
10. The discharging method of a dc withstand voltage test electromotive discharging device according to any one of claims 1 to 9, characterized by comprising the steps of:
s1: before the test, the upper end of the metal pressure equalizing ball (1) is connected with the test side of the direct current pressure-resistant device, and the electric push rod (4) is contracted to the lowest position;
s2: when the test is finished, the discharge operation is performed: operating the discharge resistor (3) to rise by the motor control device (6); the tip of the discharge resistor (3) gradually approaches the metal voltage-sharing ball (1), and the electric charge of the tested equipment breaks through the air through the metal voltage-sharing ball (1) and is conducted with the tip of the discharge resistor (3) to release the electric charge, so that primary discharge is formed;
along with the reduction of the residual voltage of the tested equipment (10) and the rise of the discharge resistor (3), the direct grounding discharge contact (2) is in contact with the metal voltage-equalizing ball (1), the residual voltage of the tested equipment (10) is conducted to the ground through the direct grounding discharge contact (2), and secondary discharge is formed;
s3: when the test device breaks down or people mistakenly enter a test area under high voltage, the motor control device (6) drives the telescopic rod of the electric push rod to quickly rise, the direct grounding discharge contact (2) is quickly contacted with the metal voltage-equalizing ball (1), and the voltage of a tested product is quickly reduced to zero potential;
s4: when the test normal discharge is completed, the direct grounding discharge contact (2) is used as a test loop metallic grounding device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110297563.1A CN113049930A (en) | 2021-03-19 | 2021-03-19 | Electric discharge device and discharge method for direct-current withstand voltage test |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110297563.1A CN113049930A (en) | 2021-03-19 | 2021-03-19 | Electric discharge device and discharge method for direct-current withstand voltage test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116559607A (en) * | 2023-05-25 | 2023-08-08 | 华能澜沧江水电股份有限公司 | Discharge device and discharge method |
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| CN210894576U (en) * | 2019-08-07 | 2020-06-30 | 苏州工业园区海沃科技有限公司 | Climbing device of discharging trolley for direct-current high-voltage test |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106374341A (en) * | 2016-08-31 | 2017-02-01 | 兴盛电器股份有限公司 | Automatic discharging rod of high-voltage switch cabinet withstand voltage test-bed |
| CN106816732A (en) * | 2017-02-20 | 2017-06-09 | 国家电网公司 | A kind of safe and intelligent electric discharge device |
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