CN110853851A - High-voltage non-inductive resistor and direct-current voltage measuring device - Google Patents
High-voltage non-inductive resistor and direct-current voltage measuring device Download PDFInfo
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- CN110853851A CN110853851A CN201810953355.0A CN201810953355A CN110853851A CN 110853851 A CN110853851 A CN 110853851A CN 201810953355 A CN201810953355 A CN 201810953355A CN 110853851 A CN110853851 A CN 110853851A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/02—Housing; Enclosing; Embedding; Filling the housing or enclosure
- H01C1/024—Housing; Enclosing; Embedding; Filling the housing or enclosure the housing or enclosure being hermetically sealed
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- 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
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Abstract
The application discloses high-pressure noninductive resistance and direct current voltage measuring device, wherein, high-pressure noninductive resistance includes: an inner insulating tube; the inner insulating tube is sleeved in the outer insulating tube, and two ends of the outer insulating tube and the inner insulating tube are both closed; at least a pair of resistor string groups are positioned between the inner insulating tube and the outer insulating tube, each pair of resistor string groups respectively comprise two resistor strings which are opposite in spiral direction and symmetrically arranged relative to the plane passing through the axis of the inner insulating tube, and the resistor string groups form a tube net-shaped circuit structure. Because the two resistor strings of each pair of resistor string groups are opposite in spiral direction and symmetrically arranged, the resistors form a pipe network circuit structure, theoretically, the inductance value is zero, and the electric field intensity on the surface of the high-voltage non-inductive resistor is greatly reduced when the high-voltage non-inductive resistor runs.
Description
Technical Field
The invention relates to the technical field of electrical elements, in particular to a high-voltage non-inductive resistor. The invention also relates to a direct-current voltage measuring device comprising the high-voltage non-inductive resistor.
Background
The non-inductive resistor is a resistor with zero inductance value, and the conventional non-inductive resistor mainly comprises a non-inductive resistor with a positive and negative spiral structure and a wire-wound non-inductive resistor.
The non-inductive resistor of the positive and negative spiral structure is formed by connecting the positive spiral resistor string and the negative spiral resistor string in series, a formed electromagnetic field is only partially offset, but the inductance of the resistor still exists, if one resistor string is damaged, the whole resistor fails, and the non-inductive resistor is easy to generate corona under high voltage.
The winding non-inductive resistor has high requirement on the manufacturing process, the electric field structure of the resistor is complex, the electric field intensity is high, and corona is easy to generate under high voltage.
In some electrical appliances sensitive to inductance and electric field, such as a direct current voltage measuring device, when the electrical appliances operate, corona discharge occurs when the electric field intensity on the surface of a high-voltage resistor of a high-voltage arm is too large, leakage current occurs, and the measurement accuracy is affected. The high-voltage resistor for the high-voltage arm must be a non-inductive resistor, and if the inductance of the high-voltage resistor is too large, the response characteristic of the product is affected, and the high-voltage resistor or other electronic devices are damaged when high voltage is impacted.
In summary, how to reduce the inductance of the non-inductive resistor and the electric field strength during operation becomes a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention is directed to a high voltage non-inductive resistor to reduce the inductance and the electric field strength during operation.
Another objective of the present invention is to provide a dc voltage measuring device including the high voltage non-inductive resistor, so as to improve the measurement accuracy and protect the dc voltage measuring device from damage.
In order to achieve the purpose, the invention provides the following technical scheme:
a high voltage non-inductive resistor comprising:
an inner insulating tube;
the inner insulating tube is sleeved in the outer insulating tube, and two ends of the outer insulating tube and two ends of the inner insulating tube are both closed;
the pair of resistor string groups are positioned between the inner insulating tube and the outer insulating tube, each pair of resistor string groups respectively comprise two resistor strings which are opposite in spiral direction and symmetrically arranged relative to a plane passing through the axis of the inner insulating tube, and the resistor string groups form a tube mesh circuit structure.
Preferably, in the high-voltage non-inductive resistor, the intersection of the resistor strings is electrically shorted.
Preferably, in the high-voltage non-inductive resistor, the resistance and the pitch of the two resistor strings of each pair of the resistor string sets are the same.
Preferably, in the above high-voltage non-inductive resistor, the high-voltage non-inductive resistor further includes an insulating fixing frame, the insulating fixing frame is installed on the inner insulating tube and/or the outer insulating tube, the resistor string group is supported and fixed on the insulating fixing frame, and the resistor string group is suspended between the inner insulating tube and the outer insulating tube.
Preferably, in the high-voltage non-inductive resistor, a mounting hole is formed in a tube wall of the inner insulating tube, one end of the insulating fixing frame is an annular supporting end used for penetrating through the resistor string, and the other end of the insulating fixing frame is an inserting fixing end used for being inserted and fixed in the mounting hole.
Preferably, in the high-voltage non-inductive resistor, the inserting fixed end is a tapered end, and the middle part of the insulating fixing frame is thinner than the two ends of the insulating fixing frame.
Preferably, in the high-voltage non-inductive resistor, both ends of the inner insulating tube and the outer insulating tube are sealed by flanges.
Preferably, in the high-voltage non-inductive resistor, the flange is provided with an annular groove and a thread structure, two ends of the inner insulating tube are in fit connection with the annular groove, and two ends of the outer insulating tube are in thread connection with the thread structure.
Preferably, in the high-voltage non-inductive resistor, the two ends of the inner insulating tube and the annular groove and the two ends of the outer insulating tube and the thread structure are further fixed by insulating glue.
Preferably, in the high-voltage non-inductive resistor, the two end connectors of the resistor string are led out of the flange and are mounted on the flange through terminals.
Preferably, in the high-voltage non-inductive resistor, each resistor string is formed by serially connecting a plurality of metal film resistors with the same resistance value; or each resistor string is formed by connecting a plurality of metal film resistors with different resistance values in series to form the high-voltage non-inductive resistor with nonlinear voltage drop.
Preferably, in the high-voltage non-inductive resistor, the intersection of the resistor strings is electrically shorted by welding.
Preferably, in the high-voltage non-inductive resistor, heat dissipation holes are formed in the pipe walls of the inner insulating pipe and the outer insulating pipe.
The invention also provides a direct current voltage measuring device which comprises the non-inductive resistor, wherein the non-inductive resistor is the high-voltage non-inductive resistor.
Compared with the prior art, the invention has the beneficial effects that:
the high-voltage non-inductive resistor provided by the invention comprises an inner insulating tube, an outer insulating tube and at least one pair of resistor string groups, wherein the resistor string groups are positioned between the inner insulating tube and the outer insulating tube, and each pair of resistor string groups respectively comprise two resistor string groups which have opposite spiral directions and are symmetrically arranged relative to a plane passing through the axis of the inner insulating tube to form a tube network circuit structure. Because the two resistor strings of each pair of resistor string groups are opposite in spiral direction and are symmetrically arranged relative to the plane passing through the axis of the inner insulating tube, the resistors form a tube network circuit structure, theoretically, the inductance value is zero, the electric field intensity on the surface of the high-voltage non-inductive resistor is greatly reduced when the high-voltage non-inductive resistor runs, the corona voltage of the resistors is greatly improved, and the phenomenon that the electric field intensity on the surface of the resistors is too high to generate corona when the high-voltage resistor runs is avoided, so that current leakage occurs. The inductance and the electric field strength during operation are reduced.
The direct-current voltage measuring device provided by the invention adopts the high-voltage non-inductive resistor, and the inductance of the high-voltage non-inductive resistor is greatly reduced, and the electric field intensity during operation is reduced, so that the measuring precision is improved, and the device is protected from being damaged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a high-voltage non-inductive resistor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a high-voltage non-inductive resistor according to an embodiment of the present invention when a resistor string is fixed by an insulating fixing frame.
Wherein, 1 is an upper flange, 2 is a lead wire, 3 is a joint, 4 is a screw, 5 is an outer insulating tube, 6 is an inner insulating tube, 7 is a lower flange, 8 is an insulating fixing frame, 9 is a resistor string group, 91 is a left spiral resistor string, 92 is a right spiral resistor string, 10 is a solder ball, and 11 is a heat dissipation hole.
Detailed Description
The core of the invention is to provide a high-voltage non-inductive resistor, which reduces the inductance and the electric field intensity during operation.
The invention also provides a direct-current voltage measuring device comprising the high-voltage non-inductive resistor, which improves the measurement precision and protects the direct-current voltage measuring device from being damaged.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 1, an embodiment of the present invention provides a high voltage non-inductive resistor, which includes an inner insulating tube 6, an outer insulating tube 5, and at least one pair of resistor string sets 9; wherein, the inner insulating tube 6 is sleeved in the outer insulating tube 5, and both ends of the outer insulating tube 5 and the inner insulating tube 6 are closed; the resistor string group 9 is located between the inner insulating tube 6 and the outer insulating tube 5, each pair of resistor string groups 9 respectively comprises two resistor strings which are opposite in spiral direction and symmetrically arranged relative to a plane passing through the axis of the inner insulating tube 6, specifically a left spiral resistor string 91 and a right spiral resistor string 92, and the resistor string groups 9 form a tube mesh circuit structure.
In the high-voltage non-inductive resistor provided by the invention, the resistor string group 9 is positioned between the inner insulating tube 6 and the outer insulating tube 5, so that the high-voltage non-inductive resistor is high in electrical insulating property and good in radial voltage resistance. Because the two resistor strings of each pair of resistor string groups 9 are opposite in spiral direction and are symmetrically arranged relative to the plane passing through the axis of the inner insulating tube 6, the resistors are in a tube network circuit structure, theoretically, the inductance value is zero, when the high-voltage non-inductive resistor runs, the voltage distribution is uniform, the axial pressure resistance is high, the electric field intensity on the surface of the resistor can be greatly reduced, the corona voltage of the resistor is greatly improved, and the phenomenon that when the high-voltage runs, the electric field intensity on the surface of the resistor is too high to generate corona and the current leakage occurs is avoided. The inductance and the electric field strength during operation are reduced.
When a plurality of pairs of resistor string sets 9 are provided, the plurality of pairs of resistor string sets 9 are uniformly arranged along the circumferential direction, and every two adjacent pairs of resistor string sets 9 are staggered by the same angle.
In this embodiment, the electrical short circuit of crossing department of each resistor string makes the structural stability of pipe network circuit structure reinforcing, is difficult to take place to warp, has stabilized voltage distribution. Of course, the resistor string may not be electrically shorted.
Further, in the present embodiment, the two resistor strings of each pair of resistor string sets 9 have the same resistance value and the same pitch, that is, the left-handed resistor string 91 and the right-handed resistor string 92 have the same resistance value and the same pitch. Therefore, the inductances of each pair of resistor string groups 9 can be mutually offset, when the resistors are electrified, the voltage distribution is more uniform, the potential is uniformly reduced, and the surface electric field intensity is smaller. Of course, different resistance values can be selected according to needs, the voltage drop trend of the high-voltage non-inductive resistor is changed, and the high-voltage non-inductive resistor with nonlinear voltage drop is designed.
As shown in fig. 1 and fig. 2, in this embodiment, the high-voltage non-inductive resistor further includes an insulating fixing frame 8, the insulating fixing frame 8 is installed on the inner insulating tube 6 and/or the outer insulating tube 5, the insulating fixing frame 8 is located between the inner insulating tube 6 and the outer insulating tube 5, the resistor string group 9 is supported and fixed on the insulating fixing frame 8, and the resistor string group 9 is suspended between the inner insulating tube 6 and the outer insulating tube 5. The resistor string group 9 is supported between the inner insulating tube 6 and the outer insulating tube 5 in a suspending way through the insulating fixing frame 5, so that the resistor string group 9 is separated from the insulating tube, and therefore the resistor string group 9 cannot be in contact with the insulating tube, and the leakage current is further reduced.
As shown in fig. 2, the insulating fixing frame 8 is optimized, in this embodiment, a mounting hole is provided on a pipe wall of the inner insulating pipe 6, one end of the insulating fixing frame 8 is an annular supporting end for passing through and supporting the resistor string, and the other end is an inserting fixing end for inserting and fixing in the mounting hole. Preferably, the intersection of each resistor string is supported and fixed by an insulating fixing frame 8. Of course, the insulating fixing frame 8 may also be adhered to the inner insulating tube 6 and/or the outer insulating tube 5, or the insulating fixing frame 8 and the inner insulating tube 6 and/or the outer insulating tube 5 are integrated.
Further, in this embodiment, the inserting fixing end is a tapered end, the middle portion of the insulating fixing frame 8 is thinner than the two ends of the insulating fixing frame 8, and the tapered end cannot exit after being inserted into the mounting hole, so that the inserting fixing firmness is improved.
As shown in fig. 1, in the present embodiment, both ends of the inner insulating tube 6 and the outer insulating tube 5 are closed by flanges. Specifically, the flange includes an upper flange 1 and a lower flange 7, which are closed at the upper and lower ends of the insulating tube, respectively.
Preferably, in this embodiment, the flange is provided with an annular groove and a thread structure, two ends of the inner insulating pipe 6 are in fit connection with the annular groove, and two ends of the outer insulating pipe 5 are in threaded connection with the thread structure. Specifically, an internal thread is provided on the flange, and an external thread is provided at both ends of the outer insulating tube 5.
Furthermore, the two ends of the inner insulating pipe 6 and the annular groove and the two ends of the outer insulating pipe 5 and the thread structure are fixed by insulating glue. The insulating adhesive is preferably epoxy resin adhesive, and the epoxy resin adhesive has the advantages of good insulativity, high bonding strength, high temperature resistance and corrosion resistance. The sealing performance of the flange and the insulating pipe is further improved by the adhesive bonding and fixing of the insulating glue.
Of course, the insulating pipe and the flange can be inserted and connected in an interference manner, so long as the sealing of the flange and the insulating pipe can be realized.
In this embodiment, through flange shielding resistance string both ends lead wire 2, each resistance string's lead wire 2 can be caught on, screws up, then reuse soldering tin welding, ensures that mechanical connection is reliable, and electrical connection is reliable, and lead wire 2 department is the lax state, and whole high pressure noninductive resistance utensil mechanical strength is high, can resist impact and vibration. The welding spot is spherical, and the electric field distribution at the welding position is improved. After the resistor string, the inner insulating pipe 6, the outer insulating pipe 5 and the flange are installed, the connectors 3 at two ends of the resistor string are led out from the middle of the flange and are connected with the terminal, and the terminal is fixed in the installation groove of the flange through the screw 4, so that reliable connection in the mechanical and electrical aspects is achieved. The terminals are preferably O-shaped terminals.
In this embodiment, each resistor string is formed by serially connecting a plurality of metal film resistors with the same resistance. Because the metal film resistor has high structural strength, and a proper metal film resistor can be selected according to the withstand voltage requirement, the resistance value requirement and the power requirement of the high-voltage non-inductive resistor, the occupied space of the metal film resistor is small, and the volume of the high-voltage non-inductive resistor is reduced.
Of course, each resistor string can be formed by connecting metal film resistors with different resistance values in series according to needs, the voltage drop trend of the high-voltage resistor is changed, and the high-voltage noninductive resistor with nonlinear voltage drop is designed.
In the present embodiment, the intersections of the resistor strings are electrically shorted by welding. The probability of wire breakage is reduced, and the reliability of mechanical connection and the reliability of electrical connection are ensured. The solder ball 10 is used as the welding point, so that the electric field distribution at the welding position is improved, and the voltage is uniform. Of course, the resistor string intersections can also be connected by a screw contact.
In this embodiment, the heat dissipation holes 11 have been opened on the pipe walls of the inner insulating pipe 6 and the outer insulating pipe 5, and since the high-voltage non-inductive resistor is powered on, heat can be generated, and by setting the heat dissipation holes 11, heat dissipation is accelerated, and the resistor is prevented from being damaged due to thermal stress generated by heat concentration. Meanwhile, the inside of the insulating gas can be filled, and the insulating property is further improved.
Based on the high-voltage non-inductive resistor described in any of the above embodiments, an embodiment of the present invention further provides a dc voltage measuring apparatus, including a non-inductive resistor, where the non-inductive resistor is the high-voltage non-inductive resistor described in any of the above embodiments, and the high-voltage non-inductive resistor is installed in a high-voltage arm of the dc voltage measuring apparatus.
The direct-current voltage measuring device adopts the high-voltage non-inductive resistor, the inductance of the high-voltage non-inductive resistor is greatly reduced, and the electric field intensity in operation is reduced, so that the measuring precision is improved, and the device is protected from being damaged.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (14)
1. A high voltage non-inductive resistor, comprising:
an inner insulating tube (6);
the outer insulating tube (5), the inner insulating tube (6) is sleeved in the outer insulating tube (5), and two ends of the outer insulating tube (5) and the inner insulating tube (6) are closed;
at least one pair of resistor string groups (9) is positioned between the inner insulating tube (6) and the outer insulating tube (5), each pair of resistor string groups (9) comprises two resistor strings which are opposite in spiral direction and symmetrically arranged relative to a plane passing through the axis of the inner insulating tube (6), and the resistor string groups (9) form a tube network circuit structure.
2. The high-voltage noninductive resistor of claim 1, wherein each resistor string intersection is electrically shorted.
3. The high-voltage noninductive resistor according to claim 1, characterized in that the resistance and pitch of the two resistor strings of each pair of resistor string sets (9) are the same.
4. The high-voltage noninductive resistor according to claim 1, further comprising an insulating fixing frame (8), wherein the insulating fixing frame (8) is mounted on the inner insulating tube (6) and/or the outer insulating tube (5), the resistor string set (9) is supported and fixed on the insulating fixing frame (8), and the resistor string set (9) is suspended between the inner insulating tube (6) and the outer insulating tube (5).
5. The high-voltage noninductive resistor as recited in claim 4, wherein the wall of the inner insulating tube (6) is provided with a mounting hole, one end of the insulating fixing frame (8) is an annular supporting end for passing through the resistor string, and the other end is a fixed end for being inserted and fixed in the mounting hole.
6. The high-voltage noninductive resistor of claim 5, wherein the plug-in fixed end is a tapered end, and the middle part of the insulating fixed frame (8) is thinner than the two ends of the insulating fixed frame (8).
7. The high-voltage noninductive resistor of claim 1, characterized in that both ends of the inner insulating tube (6) and the outer insulating tube (5) are closed by flanges.
8. The high-voltage noninductive resistor as recited in claim 7, characterized in that the flange is provided with an annular groove and a thread structure, the two ends of the inner insulating tube (6) are connected with the annular groove in a matching manner, and the two ends of the outer insulating tube (5) are connected with the thread structure in a threaded manner.
9. The high-voltage noninductive resistor as recited in claim 8, characterized in that the two ends of the inner insulating tube (6) and the annular groove and the two ends of the outer insulating tube (5) and the thread structure are fixed by insulating glue.
10. The high-voltage noninductive resistor of claim 7, wherein the two end connectors of the resistor string are led out of the flange and are mounted on the flange through terminals.
11. The high-voltage noninductive resistor of any one of claims 1-10, wherein each resistor string is formed by serially connecting a plurality of metal film resistors with the same resistance value; or each resistor string is formed by connecting a plurality of metal film resistors with different resistance values in series to form the high-voltage non-inductive resistor with nonlinear voltage drop.
12. The high-voltage noninductive resistor of claim 2, wherein each resistor string intersection is electrically shorted by welding.
13. The high-voltage noninductive resistor of any one of claims 1-10, wherein the walls of the inner insulating tube (6) and the outer insulating tube (5) are provided with heat dissipation holes (11).
14. A dc voltage measuring device comprising a non-inductive resistor, wherein the non-inductive resistor is a high voltage non-inductive resistor according to any one of claims 1 to 13.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810953355.0A CN110853851A (en) | 2018-08-21 | 2018-08-21 | High-voltage non-inductive resistor and direct-current voltage measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810953355.0A CN110853851A (en) | 2018-08-21 | 2018-08-21 | High-voltage non-inductive resistor and direct-current voltage measuring device |
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| CN110853851A true CN110853851A (en) | 2020-02-28 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57113402U (en) * | 1980-12-29 | 1982-07-13 | ||
| KR20110072633A (en) * | 2009-12-23 | 2011-06-29 | 주식회사 효성 | Water cooling type winding resistor |
| CN202394613U (en) * | 2011-12-30 | 2012-08-22 | 上海申世电气有限公司 | Non-inductive brake resistor |
| CN107123495A (en) * | 2017-05-27 | 2017-09-01 | 广东福德电子有限公司 | Heat radiating type is noninductive wire wound resistor |
| CN206628333U (en) * | 2017-02-21 | 2017-11-10 | 广东东科投资集团有限公司 | A kind of wirewound resistor with the ageing-resistant radiating skeleton of high insulation |
| CN206849603U (en) * | 2017-06-12 | 2018-01-05 | 山东安高电气设备有限公司 | A kind of noninductive braking resistor |
-
2018
- 2018-08-21 CN CN201810953355.0A patent/CN110853851A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57113402U (en) * | 1980-12-29 | 1982-07-13 | ||
| KR20110072633A (en) * | 2009-12-23 | 2011-06-29 | 주식회사 효성 | Water cooling type winding resistor |
| CN202394613U (en) * | 2011-12-30 | 2012-08-22 | 上海申世电气有限公司 | Non-inductive brake resistor |
| CN206628333U (en) * | 2017-02-21 | 2017-11-10 | 广东东科投资集团有限公司 | A kind of wirewound resistor with the ageing-resistant radiating skeleton of high insulation |
| CN107123495A (en) * | 2017-05-27 | 2017-09-01 | 广东福德电子有限公司 | Heat radiating type is noninductive wire wound resistor |
| CN206849603U (en) * | 2017-06-12 | 2018-01-05 | 山东安高电气设备有限公司 | A kind of noninductive braking resistor |
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Application publication date: 20200228 |