CN203706826U - Integrated resonance eliminator capable of limiting current and voltage at one time - Google Patents
Integrated resonance eliminator capable of limiting current and voltage at one time Download PDFInfo
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- CN203706826U CN203706826U CN201420062241.4U CN201420062241U CN203706826U CN 203706826 U CN203706826 U CN 203706826U CN 201420062241 U CN201420062241 U CN 201420062241U CN 203706826 U CN203706826 U CN 203706826U
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Abstract
The utility model relates to an integrated resonance eliminator capable of limiting current and voltage at one time. The integrated resonance eliminator is used for eliminating ferromagnetic resonance caused by an electromagnetic voltage transformer in a 6-35kv neutral-point ungrounded AC power system. The integrated resonance eliminator comprises a base, a lower-end electrode, an upper-end electrode and an insulating jacket. A nonlinear current and voltage limiting element is arranged in an inner cavity of the insulating jacket and formed by connecting a nonlinear current limiting element PTC and a nonlinear voltage limiting element VDR in parallel. Quartz sand is arranged between the nonlinear current and voltage limiting element and the insulating jacket to serve as a heat-dissipation filling layer. A current sensor is arranged in the base. The integrated resonance eliminator can effectively restrain resonance overvoltage with various frequencies and voltage transformer over-current with various frequencies, and therefore the situation that a voltage transformer and a high-voltage fuse are burned down is avoided. Moreover, the integrated resonance eliminator is high in heat dissipation speed and large in heat capacity, thereby being capable of meeting the protection requirements of long lines and high-capacity loads. Besides, by the adoption of the fully-sealed structure, the integrated resonance eliminator is stable in performance and convenient to monitor, and therefore the application range of the integrated resonance eliminator is wider.
Description
Technical field
The utility model relates to the comprehensive resonance eliminator of current limiting pressure-limiting one time, the ferro resonance causing because of electromagnetic potential transformer for eliminating 6～35kV isolated neutral electrical network, and can protect it to avoid the damage causing because of overvoltage or overcurrent.
Background technology
In service at 6～35KV electric system of neutral-piont earth free, due to a variety of causes, can produce resonance overvoltage, as various resonance overvoltages such as parametric resonance overvoltage, ferro-resonance over-voltage, linear resonance overvoltage, more than the amplitude of these resonance overvoltages can reach twice rated voltage, ageing of insulation or the damage of electrical network electric equipment are punctured, even blast; After instrument transformer electromagnetism is saturated, can produce huge overcurrent, its value can exceed the decades of times of rated exciting current, and 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.
The method of conventional limited resonance overvoltage mainly contains at the connect dissipative cell of a larger capacity of the secondary open delta winding terminal of voltage transformer, and the method for employing arc suppression coil etc., adopt first method simpler, but harmonic elimination effect is poor, the accident of burning voltage transformer and high-tension fuse still happens occasionally.Adopting second method is mainly the electric arc overvoltage problem that solves single phase intermittent ground connection, although the inhibition of resonance is had certain effect, not ideal enough, and very complicated, cost is very high.For 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 adopting is mainly the resistance of carborundum or zinc oxide material, as Chinese patent CN85200956U discloses a kind of syntony absorber for high-voltage transformer; Or the nonlinear resistance that is mutually cascaded of silicon-carbide varistor and Zinc oxide linear resistance.As Chinese patent CN 201845648 U disclose a kind of resonance eliminator, formed by current-limiting resistance and Current Limiting Diodes.Although 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, pressure limiting and current limliting be dissatisfactory shortcoming all, and radiating effect is poor, and the phenomenon that high-tension fuse burns still happens occasionally.Present domestic a kind of resonance eliminator all being formed by the znr of high-potential gracient of also producing, the resonance eliminator non linear coefficient of this structure is still relatively less, and because electric potential gradient is high, energy capacity is less, as the time slightly length will occur self damage, even blast, exist inherently safe problem, useful life is short, and it can not Real-Time Monitoring through-current capacity.
Summary of the invention
For above-mentioned problems of the prior art, the purpose of this utility model is to provide a kind of comprehensive resonance eliminator, not only realizes current limiting pressure-limiting defencive function, and is built-in with transducer and is convenient to Real-Time Monitoring through-current capacity.This resonance eliminator is simple in structure, safe and reliable, long service life.
The technical scheme that the utility model is taked for realizing its object:, a comprehensive resonance eliminator of current limiting pressure-limiting, comprise army cap, base, lower end electrode, upper end electrode and insulating coating, described insulating coating inner chamber arranges non-linear current limiting pressure-limiting element, described non-linear current limiting pressure-limiting element is by non-linear current limiting element (english abbreviation PTC) and non-linear pressure limiting element (english abbreviation VDR) formation in parallel, quartz sand is set as filling heat dissipating layer between described non-linear current limiting pressure-limiting element and insulating coating, in described base, establishes current sensor; The turnover Limited Current scope of described non-linear current limiting element (PTC) is 100mA-200mA; The direct current 1mA reference voltage of described non-linear pressure limiting element (VDR) is 6-35KV; In described base, current sensor is housed, described current sensor is connected with described non-linear current limiting pressure-limiting element.
Described insulating coating adopts epoxy tube and rubber full skirt to make, and between insulating coating bottom and base, establishes sealing gasket.
Described upper end electrode is copper electrode, and its top is connected and installed with army cap.
Described non-linear current limiting pressure-limiting element top is provided with seal cover and upper end electrode successively.The upper end electrode upper portion insulating overcoat top cover labyrinth that is arranged with suitable for reading, top cover labyrinth outside is provided with and the link electrode that army cap is connected.The utility model, owing to adopting large capacity current-limiting pressure limiting element, by the physical characteristic of himself, can well suppress overcurrent and resonance overvoltage by powerful damping in the time that resonance occurs, thereby realizes protection voltage transformer and high-tension fuse.
The utility model has following advantage compared with existing various harmonic elimination apparatus:
(1) the utility model adopts the non-linear current limiting element PTC of large capacity and the large non-linear pressure limiting element of capacity VDR composition, under normal running (operation) conditions, one time resonance eliminator presents zero resistance, does not change the operating condition of voltage transformer, can not exert an influence to the certainty of measurement of instrument transformer.While there is PT ferro resonance, one time resonance eliminator is realized quick harmonic elimination because presenting fast high resistant; And the resonance overvoltage of various frequencies is produced to inhibitory action.
(2) can effectively eliminate the caused all ferro resonances of non-linear exciter characteristic due to voltage transformer in 6～35kv isolated neutral AC system; and under a kind of transmission line length, all can effectively be limited in the overcurrent that flows through voltage transformer while there is interrupted arc ground connection on transmission line, protection voltage transformer is not damaged.
(3) radiating condition is good, and thermal capacity is large, and self blast damage accident can not occur in the time that transmission line length is greater than 100km yet.
(4) can realize multifrequency quick harmonic elimination continuously, resonance overvoltage amplitude is larger, and the harmonic elimination time is shorter;
(5) simple in structure, volume is small and exquisite, easy for installation, reliable.
Brief description of the drawings
Below in conjunction with accompanying drawing, the utility model is described further.
Fig. 1 is the utility model structural representation;
fig. 2 is the utility model electrical block diagram.
Embodiment
Referring to Fig. 1, the utility model comprises insulating coating 5, upper end electrode 2b and lower end electrode 2a, and insulating coating 5 is fixedly mounted on sealing gasket base 6, at insulating coating 5 inner chambers, non-linear current limiting pressure-limiting element 3 is installed.Non-linear current limiting pressure-limiting element 3 is the non-linear current limiting pressure-limiting element of large capacity, adopts non-linear current limiting element PTC31 and non-linear pressure limiting element VDR32 formation in parallel.Gap location between non-linear current limiting pressure-limiting element 3 and insulating coating 5 fills up and tamps quartz sand 4 as heat dissipating layer.Non-linear current limiting pressure-limiting element 3 and quartz sand 4 tops install a upper end electrode 2b additional, then use army cap 1 is connected and fixed with upper end electrode 2b, and upper end electrode 2b adopts copper electrode.Current sensor 7 is placed in base 6.Insulating coating 5 adopts epoxy tube to make, and lays some layers of rubber full skirt 51, with reinforced insulation effect at the peripheral interval of epoxy tube.Between insulating coating 5 bottoms and base 6, establish sealing gasket.
Fig. 2 is the utility model electrical block diagram, non-linear current limiting element PTC31 and non-linear pressure limiting element VDR32 parallel connection, and lower end is connected with current sensor 7.The major parameter of non-linear current limiting element PTC31 type selecting: turnover Limited Current is within the scope of 100mA-200mA.Non-linear pressure limiting element VDR32 parameter is according to direct current 1mA reference voltage type selecting, the corresponding VDR parameter of the once comprehensive resonance eliminator direct current 1mA reference voltage 6-35KV of 6-35KV electric pressure.
The utility model is used in the ferro resonance of pressing instrument transformer to cause because of electromagnetic type in 6～35KV electric system of neutral-piont earth free, be applicable to 6～35kV electromagnetic potential transformer of various models, when use, this device is installed on the high pressure winding neutral point of voltage transformer pt.
The utility model is by being installed in series army cap and base between PT neutral point and ground, under normal operating condition, to be close to be 0 about Ω to resistance, and the zero-load impedance of a winding of PT is to more than minority megaohm, therefore can not exert an influence to the properties of PT, also can obviously not change the parameters of system simultaneously.Core sataration in the time that resonance occurs PT, one time winding exciting curent increases, and once comprehensive resonance eliminator resistance rapid growth, can give play to damping action preferably.And resonant energy is larger, once comprehensively the harmonic elimination time of resonance eliminator is shorter, more favourable to the insulation of equipment.
Aspect heat radiation; adopt the technology of quartz sand auxiliary heat dissipation; because of conductive coefficient and the thermal capacity of quartz sand all much bigger than air; quartz sand can not only oneself absorb heat greatly; but also can be with speed faster by unnecessary dissipation of heat to extraneous; the main design of rubber full skirt 51 makes radiating effect better, thereby meets compared with the requirement of macro-energy and the protection of long-term resonance overvoltage.In structure aspects, adopt hermetically sealed form.
Claims (3)
1. a comprehensive resonance eliminator of current limiting pressure-limiting, comprise army cap (1), base (6), lower end electrode (2a), upper end electrode (2b) and insulating coating (5), it is characterized in that: described insulating coating (5) inner chamber arranges non-linear current limiting pressure-limiting element (3), described non-linear current limiting pressure-limiting element is by non-linear current limiting element (31) and non-linear pressure limiting element (32) formation in parallel, quartz sand (4) is set as filling heat dissipating layer between described non-linear current limiting pressure-limiting element (3) and insulating coating (5), in described base (6), establish current sensor (7), the turnover Limited Current scope of described non-linear current limiting element (31) is 100mA-200mA, the direct current 1mA reference voltage of described non-linear pressure limiting element (32) is 6-35KV, described base is equipped with current sensor in (7), and described current sensor is connected with described non-linear current limiting pressure-limiting element.
2. a comprehensive resonance eliminator of current limiting pressure-limiting according to claim 1, it is characterized in that: described insulating coating (5) adopts epoxy tube to make, lay the rubber full skirt of some layers for dispelling the heat at the peripheral interval of described epoxy tube, between insulating coating (5) bottom and base (6), establish sealing gasket.
3. a comprehensive resonance eliminator of current limiting pressure-limiting according to claim 1, is characterized in that: described upper end electrode (2b) is copper electrode, and its top is connected and installed with army cap (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420062241.4U CN203706826U (en) | 2014-02-12 | 2014-02-12 | Integrated resonance eliminator capable of limiting current and voltage at one time |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420062241.4U CN203706826U (en) | 2014-02-12 | 2014-02-12 | Integrated resonance eliminator capable of limiting current and voltage at one time |
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| Publication Number | Publication Date |
|---|---|
| CN203706826U true CN203706826U (en) | 2014-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420062241.4U Expired - Fee Related CN203706826U (en) | 2014-02-12 | 2014-02-12 | Integrated resonance eliminator capable of limiting current and voltage at one time |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103824684A (en) * | 2014-02-12 | 2014-05-28 | 合肥多安自动化技术有限公司 | Comprehensive once current-limiting and voltage-limiting resonance eliminator |
| CN108169630A (en) * | 2018-03-08 | 2018-06-15 | 云南电网有限责任公司电力科学研究院 | A kind of device and method of neutral point ungrounded electric network resonance on-line monitoring |
| CN110768222A (en) * | 2019-10-24 | 2020-02-07 | 深圳供电局有限公司 | Voltage transformer resonance elimination device and protection equipment |
-
2014
- 2014-02-12 CN CN201420062241.4U patent/CN203706826U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103824684A (en) * | 2014-02-12 | 2014-05-28 | 合肥多安自动化技术有限公司 | Comprehensive once current-limiting and voltage-limiting resonance eliminator |
| CN108169630A (en) * | 2018-03-08 | 2018-06-15 | 云南电网有限责任公司电力科学研究院 | A kind of device and method of neutral point ungrounded electric network resonance on-line monitoring |
| CN108169630B (en) * | 2018-03-08 | 2023-10-20 | 云南电网有限责任公司电力科学研究院 | Device and method for on-line monitoring resonance of neutral point ungrounded power grid |
| CN110768222A (en) * | 2019-10-24 | 2020-02-07 | 深圳供电局有限公司 | Voltage transformer resonance elimination device and protection equipment |
| CN110768222B (en) * | 2019-10-24 | 2022-07-08 | 深圳供电局有限公司 | Voltage transformer resonance elimination device and protection equipment |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200324 Address after: 230088 Lighting Workshop of Hefei Suno Photoelectric Co., Ltd. 300 meters north of the junction of Changning Avenue and Huguang Road in Hefei High-tech Zone, Anhui Province Patentee after: Anhui Chunzhi Electromechanical Technology Co., Ltd Address before: High tech Zone, Hefei Road, Anhui, No. 221, 230088 Patentee before: HEFEI DUOAN AUTOMATION TECHNOLOGY Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140709 Termination date: 20210212 |
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| CF01 | Termination of patent right due to non-payment of annual fee |