CN2510966Y - Resonance eliminating device - Google Patents
Resonance eliminating device Download PDFInfo
- Publication number
- CN2510966Y CN2510966Y CN 01262405 CN01262405U CN2510966Y CN 2510966 Y CN2510966 Y CN 2510966Y CN 01262405 CN01262405 CN 01262405 CN 01262405 U CN01262405 U CN 01262405U CN 2510966 Y CN2510966 Y CN 2510966Y
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Abstract
The utility model relates to a resonance eliminating device used for eliminating the ferromagnetic resonance caused by a voltage mutual inductor in the 3 to 35KV neutral point earth-free AC power system. The utility model is characterized in that a zinc bloom pressure-sensitive power resistor is connected in series and stacked in an insulating coating; the arenaceous quartz is arranged in the gap between the zinc bloom pressure-sensitive power resistor and the insulating coating; the upper part of the zinc bloom pressure-sensitive power resistor is arranged in sequence with an airtight cover and an electrode. The utility model uses the zinc bloom pressure-sensitive power resistor in the low potential gradient and is very easy to match with the characteristic of the voltage mutual inductor. The non-linear coefficient is large, and the effects of the current limiting and the pressure-limiting are more obvious, so the burnout of the voltage mutual inductor and a high-voltage fuse is avoided. The speed of heat dissipation is quick, and the calorific capacity is large, so the protection requirement of the long line and the high capacity load is satisfied. The utility model adopts fully sealed structure and has stable performance. The utility model is no request for the using place, and the scope of application is extensive.
Description
Technical field
The utility model relates to a kind of in order to eliminate the resonance eliminator of the ferro resonance that causes because of voltage transformer in 3～35KV isolated neutral AC electric power systems.
Background technology
In service in 3～35KV isolated neutral power system, because a variety of causes, can produce resonance overvoltage, as various resonance overvoltages such as parametric resonance overvoltage, ferro-resonance over-voltage, linear resonance overvoltage, the amplitude of these resonance overvoltages can reach more than the twice rated voltage, make the ageing of insulation or the puncture of electrical network electric equipment, Explosion of on Arrester; Can produce huge overcurrent in the instrument transformer, its value even surpass tens of times of rated exciting current, the time one is long, and voltage transformer will be burnt, the accident of can blasting when serious, and its high-tension fuse can be burnt.
Mainly contain at the connect dissipative cell of a larger capacity of the secondary triangle winding terminal of voltage transformer in the method for traditional restriction resonance overvoltage, and the method for employing arc suppression coil etc., adopt first method simpler, but the harmonic elimination effect is relatively poor, and the accident of burning voltage transformer and high-tension fuse still happens occasionally.Adopting second method mainly is the electric arc overvoltage problem that solves single phase intermittent ground connection, though the inhibition of resonance is had certain effect, not ideal enough, and very complicated, cost is very high.At above-mentioned situation, people design at connect the over the ground product of a nonlinear resistance of a central point of voltage transformer, but the nonlinear resistance that is adopted mainly is a silicon-carbide varistor, discloses a kind of high voltage potential transformer resonance eliminator as Chinese patent 85200817.1; Or the nonlinear resistance that is cascaded mutually of silicon-carbide varistor and zinc oxide linear resistance, a kind of voltage transformer resonance eliminator is disclosed as Chinese patent 93220495.3, though above-mentioned resonance eliminator can solve the problem of resonance overvoltage to a certain extent, but it is little all to exist non linear coefficient, the all dissatisfactory shortcoming of pressure limiting and current limliting, the phenomenon that high-tension fuse burns out still happens occasionally.Present domestic a kind of resonance eliminator of all forming of also producing by the zinc-plated nonlinear resistance of the oxidation of high-potential gracient, the resonance eliminator non linear coefficient of this structure is still littler relatively, and because electric potential gradient height, the energy capacity is less, as the time slightly length self will take place damages, even blast, existing the inherently safe problem, useful life is shorter.In order to improve the self-radiating condition of resonance eliminator, leave louvre mostly on the coat, poorly sealed, what have does not even use overcoat, nonlinear resistance is directly exposed in air, because the water in air molecule is to the resistive element Effect on Performance, its life-span and fail safe are greatly diminished, be in operation the accident of making moist and exploding because of element once repeatedly takes place.
Summary of the invention
The utility model provides the resonance eliminator of a kind of electric potential gradient height, can capacity bigger, simple in structure, safe and reliable, long service life.
Its concrete technical solution is such:
Resonance eliminator, it is characterized in that comprising Zinc-oxide piezoresistor, insulating coating and electrode, the insulating coating bottom is provided with the sealing gasket base, the Zinc-oxide piezoresistor series connection is folded to be located in the insulating coating, gap location between Zinc-oxide piezoresistor and the insulating coating is provided with quartz sand, and Zinc-oxide piezoresistor top is provided with seal cover and electrode successively.
Zinc-oxide piezoresistor top also is provided with copper electrode and spring successively in the insulating coating, the copper electrode top insulating coating top cover labyrinth that is arranged with suitable for reading, and the top cover labyrinth outside is provided with link electrode.
Described quartz sand is 600～800 orders.
The utility model is about 0.8 because the non linear coefficient of the zinc oxide pressure-sensitive power resistor that adopts is bigger at 15mA and 300mA two point examination, can limit overcurrent and resonance overvoltage well, thereby realizes protection voltage transformer and high-tension fuse.Because the Zinc-oxide piezoresistor electric potential gradient that adopts is lower, so can be easy on the one hand to realize insulation coordination with voltage transformer, on the other hand can be by increasing the quantity of using, to reach the requirement of increase energy capacity, and this Zinc-oxide piezoresistor is a kind of high-power valve block, and unit volume can reach more than five to ten times of common high-potential gradient zinc oxide piezoresistive by capacity.Aspect heat radiation; adopt the technology of quartz sand auxiliary heat dissipation; because of the conductive coefficient and the thermal capacity of quartz sand all much bigger than air; quartz sand can not only oneself absorb heat greatly; go but also can unnecessary heat be dispersed in the air with fast speeds, thus satisfied requirement than macro-energy and the protection of long-term resonance overvoltage.In configuration aspects, adopt hermetically sealed form.Satisfied the service requirement of Zinc-oxide piezoresistor, guaranteed the stability of its superperformance, the field of employment is not required substantially, the scope of application is wider.
The utility model is simple in structure, and is cheap, and is non-maintaining product.
Description of drawings
Fig. 1 is the utility model structural representation.
Embodiment
Below in conjunction with accompanying drawing, the utility model is done to describe further.
This resonance eliminator comprises zinc oxide pressure-sensitive power resistor 1, insulating coating 2 and electrode.Insulating coating 2 is fixedly mounted on the sealing gasket base 6,1 series connection of zinc oxide pressure-sensitive power resistor is stacked in the insulating coating 2, gap location between zinc oxide pressure-sensitive power resistor 1 and the insulating coating 2 fills up and tamps quartz sand 3, quartz sand 3 is 600 orders, zinc oxide pressure-sensitive power resistor 1 and quartz sand 3 tops install a copper electrode 4 additional, holddown spring 5 is installed on the copper electrode 4, use the suitable for reading good seal of top cover labyrinth 7 with insulating coating 2 again, the outside that at last link electrode 8 is fixedly mounted on top cover labyrinth 7 gets final product.
Claims (3)
1, resonance eliminator, it is characterized in that comprising Zinc-oxide piezoresistor, insulating coating and electrode, the insulating coating bottom is provided with the sealing gasket base, the Zinc-oxide piezoresistor series connection is folded to be located in the insulating coating, gap location between Zinc-oxide piezoresistor and the insulating coating is provided with quartz sand, and Zinc-oxide piezoresistor top is provided with seal cover and electrode successively.
2, resonance eliminator according to claim 1 is characterized in that Zinc-oxide piezoresistor top also is provided with copper electrode and spring successively in the insulating coating, the copper electrode top insulating coating top cover labyrinth that is arranged with suitable for reading, and the top cover labyrinth outside is provided with link electrode.
3, resonance eliminator according to claim 1 is characterized in that described quartz sand is 600～800 orders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01262405 CN2510966Y (en) | 2001-08-24 | 2001-08-24 | Resonance eliminating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01262405 CN2510966Y (en) | 2001-08-24 | 2001-08-24 | Resonance eliminating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2510966Y true CN2510966Y (en) | 2002-09-11 |
Family
ID=33670146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01262405 Expired - Fee Related CN2510966Y (en) | 2001-08-24 | 2001-08-24 | Resonance eliminating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2510966Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100426425C (en) * | 2003-11-11 | 2008-10-15 | 郑琛 | Process for producing modified zinc oxide nonlinear resonance eliminator |
| CN104392815A (en) * | 2014-11-21 | 2015-03-04 | 国家电网公司 | Method for selecting and assembling valve plates of zinc oxide voltage dependent resistor |
-
2001
- 2001-08-24 CN CN 01262405 patent/CN2510966Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100426425C (en) * | 2003-11-11 | 2008-10-15 | 郑琛 | Process for producing modified zinc oxide nonlinear resonance eliminator |
| CN104392815A (en) * | 2014-11-21 | 2015-03-04 | 国家电网公司 | Method for selecting and assembling valve plates of zinc oxide voltage dependent resistor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |