CN205211513U - Grid type resistor and resistance card thereof - Google Patents
Grid type resistor and resistance card thereof Download PDFInfo
- Publication number
- CN205211513U CN205211513U CN201520894510.8U CN201520894510U CN205211513U CN 205211513 U CN205211513 U CN 205211513U CN 201520894510 U CN201520894510 U CN 201520894510U CN 205211513 U CN205211513 U CN 205211513U
- Authority
- CN
- China
- Prior art keywords
- resistor
- resistor disc
- grid type
- width
- resistance card
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000005611 electricity Effects 0.000 claims description 5
- 239000004020 conductor Substances 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 13
- 239000006185 dispersion Substances 0.000 abstract description 9
- 230000007935 neutral effect Effects 0.000 description 7
- 238000009413 insulation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000012946 outsourcing Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000012932 thermodynamic analysis Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Landscapes
- Details Of Resistors (AREA)
Abstract
The utility model relates to a grid type resistor and resistance card thereof, grid type resistor, fix respectively on the fixed plate of both sides including bracing piece, bracing piece both ends, at least a set of resistance card is worn to be equipped with in the interval on the bracing piece, the resistance card about along the direction extend, be equipped with two at least grooves along upper and lower direction is spaced apart on the resistance card, the notch opposite direction in two adjacent grooves, the width of rebate in every groove is greater than groove bottom width. The utility model discloses a resistor passes through the heat radiating area of grid design increase resistor, has reduced the temperature rise in short -term of resistor, has improved the intensity and the heat dispersion of resistor, utilizes the special narrow groove structure in the wide end of mouth on the resistance card further to provide heat dispersion.
Description
Technical field
The utility model relates to a kind of grid type resistor and resistor disc thereof.
Background technology
Along with the fast development of China's economy, urban power distribution network adopts ring network power supply on the one hand, multiple feed mode; Urban power distribution network starts to adopt based on cable in a large number on the other hand, and overhead transmission line is auxiliary powering mode; The extensive use of some new electric equipments simultaneously, earthing mode originally starts to occur some defects.Adopt the electrical network of isolated neutral or grounding through arc mode, the amplitude of its arc grounding over-voltage and ferro-resonance over-voltage is higher, and the duration is long, serious threat is caused to device security, the electric equipment that particularly insulation level is lower, after ground fault occurs, allow to operate with failure in 2h, system, under power-frequency voltage rising condition, easily causes the aging of electric equipment and cable insulation, and punctures or flashover in the weak part of insulation.Thus cause phase fault, expansion accident scope.
Therefore effectively eliminate arc grounding over-voltage and can improve reliability that power distribution network powers, fail safe and economy greatly.For the single phase ground fault of power distribution network, although failure line selection and faulty indication can improve power distribution network reliability of operation to a certain extent, but in view of various conventional microcomputer small-current earthing ubiquity route selection in current power distribution network is inaccurate and the excessive problem causing line over-voltage and ferro resonance of earth current, neutral resistor earthing mode starts to be paid attention to gradually.
Neutral point resistor coordinates with backstage zero sequence protection device monitors neutral ground electric current, and when earth current is greater than zero sequence protection device setting current value, just think this circuit ground connection, system optionally will excise earth fault line at short notice.
Neutral point adopts the electrical network of resistance-grounded system mode, and when there is single phase ground fault, grounding resistor will produce very large heat in a short period of time, and temperature sharply rises, and this proposes very high requirement to the heat dispersion of resistor and bulk strength.China resistor starting evening, exists as too high in temperature rise, heat dispersion is poor, shortcomings such as intensity temperature influence large grade, seriously constrains domestic power grid security and upgrading.In addition, import resistor expensive, serve delayed.In view of above various reasons, extremely urgent to the Improvement work of resistor.
The resistor of prior art Nakamura Ataru grid type, if application number is 201020200351.The Chinese patent document " New grid type resistor " of 4, disclose one group of resistor structure, comprise support bar, support bar two ends are separately fixed on the fixed head of both sides, on support bar, interval is equipped with one group of resistor disc, each resistor disc as shown in Figure 1, resistor disc extends in left-right direction, spaced apart along the vertical direction multiple groove on resistor disc; The notch direction of adjacent two grooves is contrary.
The structural design of this resistor disc considers radiating effect, but still has larger gap apart from demand.
Utility model content
The purpose of this utility model is to provide one group of grid type resistor, in order to solve the not good problem of prior art heat dispersion.Additionally provide a kind of resistor disc simultaneously.
For achieving the above object, the utility model provides a kind of grid type resistor, one comprises support bar, support bar two ends are separately fixed on the fixed head of both sides, on support bar, interval is equipped with at least one group of resistor disc, described resistor disc extends in left-right direction, spaced apartly along the vertical direction on resistor disc is provided with at least two grooves; The notch direction of adjacent two grooves is contrary; The width of rebate of each groove is greater than slot bottom width.
Described each groove is made up of a pair flap between two pairs of parallel side plates and two pairs of parallel side plates, and described side plate is identical with flap width.
Described bottom land dorsal part is pan head shape.
In described one group of resistor disc, a middle resistor disc to be conducted electricity with the fixed head of side by bonding conductor and is connected.
The utility model additionally provides a kind of resistor disc, and resistor disc extends in left-right direction, spaced apartly along the vertical direction on resistor disc is provided with at least two grooves; The notch direction of adjacent two grooves is contrary; The width of rebate of each groove is greater than slot bottom width.
Described each groove is made up of a pair flap between two pairs of parallel side plates and two pairs of parallel side plates, and described side plate is identical with flap width.
Described bottom land dorsal part is pan head shape.
Resistor of the present utility model increases the area of dissipation of resistor by grid design, reduce the temperature rise in short-term of resistor, improve intensity and the heat dispersion of resistor, the groove structure utilizing the special mouth wide end on resistor disc narrow further provides heat dispersion.
Resistor disc in the middle of adopting is connected to fixed head, eliminates floating potential, enhances the compressive resistance of resistor, avoid partial discharge.
Accompanying drawing explanation
Fig. 1 is the resistor disc structure chart of prior art;
Fig. 2 is resistor disc structure chart of the present utility model;
Fig. 3 is that tap mode schematic diagram extracted out by resistor of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in more detail.
R&D process of the present utility model comprises: (1) utilizes finite element analysis software ANSYS to set up rasterizing resistor disc model to carry out thermodynamic analysis and electrodynamic analysis, draw thermal field and the distribution map of the electric field of resistor disc.(2) according to thermodynamic analysis results, the resistor disc cut mode optimized is adopted, design grid resistor disc.(3) often will organize extraction tap in the middle of resistance to be connected with resistor outsourcing fixed side, create equipotential.(4) energizing test verifies heat dispersion and the insulation property of resistor disc.
The utility model patent is for easily cohering under current conventional resistor high temperature, flexural deformation, even ruptures and the novel substitute products of one developed.The utility model patent takes full advantage of the relation between the sectional area of band, shape, maximum operation (service) temperature, by designing resistor rasterizing, successfully solve that existing resistor meets that high temperature easily coheres, flexural deformation, the defect that even ruptures, improve the safety and reliability that resistor runs.In addition, the utility model patent adopts often organizes the mode that tap extracted out by resistor disc, eliminates floating potential, enhances the compressive resistance of resistor, avoid partial discharge.
Concrete, as shown in Figure 2,3, a kind of grid is without the resistor of floating potential, and comprise support bar 1, support bar 1 two ends are separately fixed on the fixed head 2 of both sides, on support bar 1, interval is equipped with at least one group of resistor disc 3.Same as the prior art, resistor disc can be one or more groups, and resistor disc can form the structure of serial or parallel connection.
The heat dissipation capacity of resistor disc is directly proportional to its efficiently radiates heat area.Therefore, resistor disc adopts grid design to be conducive to cross-ventilation, increases the effective heat exchange area of resistor disc, the temperature rise in short-term of resistor disc is reduced, can improve the useful life of resistor.Grid design and outer encapsulating radiating mode thereof change the structural design of general resistor, and avoid resistor Yin Wendu too high and cause intensity to reduce, this improves the intensity of resistor to a certain extent.
As shown in Figure 2, each resistor disc extends in left-right direction, and the hole 6 at two ends is the perforation of support bar, spaced apartly along the vertical direction on resistor disc is provided with multiple groove 4; The notch direction of adjacent two grooves is contrary; The width of rebate of each groove is greater than slot bottom width.Each groove is made up of a pair flap 43 between two pairs of parallel side plates, 41,42 and two pairs of parallel side plates.Side plate 41,42 is identical with the width of flap 43.Bottom land dorsal part 44 is pan head shape.
Based on this design, can maximized expansion heat dissipation channel, optimize radiating effect further, but also take into account resistor disc intensity and Electric Field Distribution.
As shown in Figure 3, resistor adopts resistor disc to extract the mode of tap out, and namely in one group of resistor disc, middle resistor disc is conducted electricity with a fixed head 2 by bonding conductor 5 and is connected.Centre refers to the resistor disc of middle part or near middle.
During resistance grounded system generation single phase ground fault, resistor will bear high voltage, and some areas will accumulate a large amount of electric charge, easily cause floating potential, can produce partial discharge, affect equipment safety operation when floating potential is larger.Resistor adopts resistor disc to extract the mode of tap out, often will organize extraction tap in the middle of resistance and be connected with resistor outsourcing fixed side, excess charge of having released, create equipotential, thus eliminate floating potential, enhance the compressive resistance of resistor, not easily leak electricity.
During resistance grounded system generation single phase ground fault, resistor will bear high voltage, and some areas will accumulate a large amount of electric charge, easily cause floating potential, can produce partial discharge, affect equipment safety operation when floating potential is larger.Resistor adopts resistor disc to extract the mode of tap out, often will organize extraction tap in the middle of resistance and be connected with resistor outsourcing fixed side, excess charge of having released, create equipotential, thus eliminate floating potential, enhance the compressive resistance of resistor, not easily leak electricity.
By finite element analysis software ANSYS simulation analysis and energizing test, adopt the resistor of grid design, temperature rise is in short-term no more than 700 DEG C, and resistor oxygenation efficiency is low, and under high temperature, resistor remains intact.The mode of tap extracted out by resistor disc, makes the overall Electric Field Distribution of resistor even, suddenlys change without field intensity.
According to above design, and through verification experimental verification, the neutral point grounding resistor heat dispersion adopting grid design and resistor disc to extract point connection technology out is given prominence to, excellent insulating property, operation stability is high, and the advantages such as it is lower to have cost, good looking appearance, for the all-round popularization of distribution network system Neutral Grounding through Resistance in Electrical technology creates condition.
As other execution modes, if do not consider the impact of floating potential, resistor disc also can not be adopted to extract the mode of tap out.
In addition, key of the present utility model is the shape of resistor disc, and the design that the key of its shape is narrow at the bottom of slot opening, according to this key Design, can also form other resistor disc structures being different from above embodiment.
Be presented above the embodiment that the utility model relates to, but the utility model is not limited to described execution mode.Under the thinking that the utility model provides; the mode easily expected to those skilled in the art is adopted to convert the technological means in above-described embodiment, replace, revise; and the effect played utility model object that is substantially identical with the relevant art means in the utility model, that realize is also substantially identical; the technical scheme of such formation is carried out fine setting to above-described embodiment and is formed, and this technical scheme still falls in protection range of the present utility model.
Claims (7)
1. a grid type resistor, comprise support bar, support bar two ends are separately fixed on the fixed head of both sides, on support bar, interval is equipped with at least one group of resistor disc, and described resistor disc extends in left-right direction, spaced apartly along the vertical direction on resistor disc is provided with at least two grooves; It is characterized in that, the notch direction of adjacent two grooves is contrary; The width of rebate of each groove is greater than slot bottom width.
2. a kind of grid type resistor according to claim 1, is characterized in that, described each groove is made up of a pair flap between two pairs of parallel side plates and two pairs of parallel side plates, and described side plate is identical with flap width.
3. a kind of grid type resistor according to claim 2, is characterized in that, described bottom land dorsal part is pan head shape.
4. a kind of grid type resistor according to claim 1 or 2 or 3, is characterized in that, in described one group of resistor disc, a middle resistor disc to be conducted electricity with the fixed head of side by bonding conductor and is connected.
5. a resistor disc, is characterized in that, resistor disc extends in left-right direction, spaced apartly along the vertical direction on resistor disc is provided with at least two grooves; The notch direction of adjacent two grooves is contrary; The width of rebate of each groove is greater than slot bottom width.
6. a kind of resistor disc according to claim 5, is characterized in that, described each groove is made up of the flap between two pairs of parallel side plates and two pairs of parallel side plates, and described side plate is identical with flap width.
7. a kind of resistor disc according to claim 6, is characterized in that, described bottom land dorsal part is pan head shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520894510.8U CN205211513U (en) | 2015-11-11 | 2015-11-11 | Grid type resistor and resistance card thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520894510.8U CN205211513U (en) | 2015-11-11 | 2015-11-11 | Grid type resistor and resistance card thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205211513U true CN205211513U (en) | 2016-05-04 |
Family
ID=55849214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520894510.8U Active CN205211513U (en) | 2015-11-11 | 2015-11-11 | Grid type resistor and resistance card thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205211513U (en) |
-
2015
- 2015-11-11 CN CN201520894510.8U patent/CN205211513U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104124783A (en) | Electricity fetching device based on electric transmission line aerial thunder prevention ground wires | |
| CN203367955U (en) | Low voltage power cable isolation device | |
| CN201699161U (en) | Contact-type ground bar | |
| CN204588434U (en) | Circuit is charged upgrades device for hoisting for the two division of a kind of high voltage power transmission | |
| CN201430401Y (en) | Position-changing and connection system for tower and ground wires | |
| CN101612894A (en) | Electric locomotive pantograph arc blowout device | |
| CN205211513U (en) | Grid type resistor and resistance card thereof | |
| CN202840439U (en) | Double ground wire connecting system | |
| CN206650184U (en) | A kind of single-core cable sheath ground structure | |
| CN201732672U (en) | Harmonic elimination type voltage transformer | |
| Wang et al. | The electric energy loss in overhead ground wires of 110kV six-circuit transmission line on the same tower | |
| CN203553867U (en) | Simple tower lightning arrester | |
| CN203103038U (en) | High-resistance neutral grounding resistance device | |
| CN203813320U (en) | Tool for live exchange of 220 kV narrow base tower strain insulator string | |
| CN202796818U (en) | Direct water-cooling type quick fuse | |
| CN102510163A (en) | High-current wind power outlet box structure | |
| CN102780176B (en) | Method for reducing insulation overhead ground wire induction voltage of alternating current transmission line | |
| CN202601858U (en) | Lightning-proof gap type grounding device | |
| Bi et al. | Study on lightning withstand level and induced voltage after insulation reconstruction of overhead ground wire | |
| CN205070439U (en) | A blend switch for low pressure capacitance compensation cabinet | |
| CN103825223A (en) | Tool and working method for live change of 220KV narrow base tower strain insulator string | |
| WO2014044048A1 (en) | Two-terminal direct current bipolar power transmission system of neutral point disperse grounding type | |
| CN210577325U (en) | Simple and convenient installation device of outdoor zero sequence current transformer | |
| CN203631987U (en) | Lightning-protection device for insulator through employing rotating shaft for double-adjustment of parallel gap | |
| CN203165629U (en) | Iron core for magnetically-controlled reactor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |