CN201845648U - Primary resonance eliminator - Google Patents
Primary resonance eliminator Download PDFInfo
- Publication number
- CN201845648U CN201845648U CN2010205174596U CN201020517459U CN201845648U CN 201845648 U CN201845648 U CN 201845648U CN 2010205174596 U CN2010205174596 U CN 2010205174596U CN 201020517459 U CN201020517459 U CN 201020517459U CN 201845648 U CN201845648 U CN 201845648U
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- resonance eliminator
- limiting element
- current
- insulating coating
- capacity
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Abstract
The utility model relates to a primary resonance eliminator, which is used for eliminating ferroresonance generated by electromagnetic voltage transformers in isolated-neutral alternating-current power systems of 6kV to 35kV. The primary resonance eliminator comprises a base (7), a lower electrode (3a), an upper electrode (3b) and an insulating sheath (6), a high-capacity current-limiting element (4) is arranged in the insulating sheath (6), and quartz sand (5) as a heat-dispersing layer is arranged between the high-capacity current-limiting element (4) and the insulating sheath (6). A current-limiting resistor and a current-limiting diode are connected in series to form the high-capacity current-limiting element (4). Adopting the high-capacity current-limiting element, the primary resonance eliminator can effectively inhibit the overvoltage and overcurrent of a voltage transformer, thus preventing the voltage transformer and a high-voltage fuse from being burnt out, the heat-dispersing speed is high, the thermal capacity is high, and the primary resonance eliminator meets the requirement on the protection of a long line and a high-capacity load. A full-sealed structure is adopted, the performance is table, and the application range is wider.
Description
Technical field
The utility model relates to an a kind of resonance eliminator, is used for eliminating the ferro resonance that 6～35kV isolated neutral electrical network causes because of electromagnetic potential transformer, and can protects it to avoid damaging.
Background technology
In service at 6～35kV electric system of neutral-piont earth free, 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, as Chinese patent 93220495.3 a kind of voltage transformer resonance eliminator is disclosed, 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, all dissatisfactory shortcoming of pressure limiting and current limliting, and radiating effect is poor, and the phenomenon that high-tension fuse burns still happens occasionally.Present domestic a kind of resonance eliminator of all forming of also producing by the znr 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 short.
Summary of the invention
At above-mentioned problems of the prior art, the purpose of this utility model is to provide an a kind of resonance eliminator of can capacity big, simple in structure, safe and reliable, long service life.
The utility model is the technical scheme that its purpose of realization is taked: a resonance eliminator, comprise base, lower end electrode, upper end electrode and insulating coating, big capacity current limiting element is set in the described insulating coating, quartz sand is set as heat dissipating layer between described big capacity current limiting element and the insulating coating.
Described big capacity current limiting element adopts current-limiting resistance to be connected in series with the current limliting diode and forms.
Be provided with sealing gasket between described insulating coating bottom and the base, big capacity current limiting element series connection is assembled in the insulating coating, gap location between big capacity current limiting element and the insulating coating is filled quartz sand, and big capacity current limiting element top is provided with seal cover and upper end electrode successively.The upper end electrode top insulating coating top cover labyrinth that is arranged with suitable for reading, the top cover labyrinth outside is provided with link electrode.The utility model by the physical characteristic of himself, can well suppress overcurrent and resonance overvoltage by powerful damping owing to adopt big capacity current limiting element when resonance takes place, thereby realizes protection voltage transformer and high-tension fuse.
The utility model has been compared following advantage with existing various harmonic elimination apparatus:
(1) the utility model adopts big capacity current limiting element to form, and under normal running (operation) conditions, one time resonance eliminator presents low-resistance, does not change the operating condition of voltage transformer, can not exert an influence to the certainty of measurement of instrument transformer.When the PT ferro resonance took place, one time resonance eliminator was realized quick harmonic elimination because of presenting high resistant fast;
(2) can eliminate effectively in 6～35kV isolated neutral AC system because caused all ferro resonances of non-linear exciter characteristic of voltage transformer; and under individual kind of transmission line length, all can be limited in the overcurrent that flows through voltage transformer when on the transmission line interrupted arc ground connection being taken place effectively, the protection voltage transformer is not damaged.
(3) radiating condition is good, and thermal capacity is big, in transmission line length self blast damage accident can not take place yet during greater than 100km.
(4) can realize continuously harmonic elimination fast, the resonance overvoltage amplitude is big more, and the harmonic elimination time is short more;
(5) simple in structure, volume is small and exquisite, and is easy for installation, reliable.
Description of drawings
Below in conjunction with accompanying drawing, the utility model is described further.
Fig. 1 is the utility model structural representation.
Embodiment
Referring to Fig. 1, the utility model comprises insulating coating 6 and lower end electrode 3a, and insulating coating 6 is fixedly mounted on the sealing gasket base 7, and big capacity current limiting element 4 is installed in insulating coating 6.Big capacity current limiting element 4 adopts current-limiting resistance to be connected in series with the current limliting diode and forms.Gap location between big capacity current limiting element 4 and insulating coating 6 fills up and tamps quartz sand 5 as heat dissipating layer.Big capacity current limiting element 4 and quartz sand 5 tops install a upper end electrode 3b additional, are connected with upper end electrode 3b with high-tension cable 1 again, at last the suitable for reading good seal of seal cover 2 with insulating coating 6 are got final product.Insulating coating 6 adopts epoxy tube or ceramic jacket to make, and establishes sealing gasket between insulating coating 6 bottoms and base 7.Described upper end electrode 3b is a copper electrode, and ambroin seal cover 2 is adopted in its top, and described upper end electrode 3b is electrically connected high-tension cable 1.Base 7 adopts aluminium bar to make.
The utility model is applicable to 6～35kV electromagnetic potential transformer of various models, the high-tension cable 1 that carries with this device during use draws the high pressure winding neutral point of voltage transformer receives this device, again earth connection is drawn on the installing hole of receiving base 7, tightly get final product with bolt.
This practicality is installed in series between PT neutral point and ground, and resistance is about 40k Ω under the normal operating condition, and the impedance of a winding of PT is a mega-ohms, therefore can every performance of PT not exerted an influence, and also can obviously not change the parameters of system simultaneously.Core sataration when resonance takes place PT, one time the winding exciting curent increases, and one time resonance eliminator resistance increases fast, can give play to damping action preferably.And resonant energy is big more, and the harmonic elimination time of a resonance eliminator is short more, and is more favourable to the insulation of equipment.
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.
Claims (5)
1. resonance eliminator, comprise base (7), lower end electrode (3a), upper end electrode (3b) and insulating coating (6), it is characterized in that being provided with in the described insulating coating (6) big capacity current limiting element (4), quartz sand (5) is set as heat dissipating layer between described big capacity current limiting element (4) and the insulating coating (6).
2. a resonance eliminator according to claim 1 is characterized in that described big capacity current limiting element (4) adopts current-limiting resistance to be connected in series with the current limliting diode and forms.
3. a resonance eliminator according to claim 1 is characterized in that described insulating coating (6) adopts epoxy tube or ceramic jacket to make, and establishes sealing gasket between insulating coating (6) bottom and base (7).
4. a resonance eliminator according to claim 1 is characterized in that described upper end electrode (3b) is copper electrode, and ambroin seal cover (2) is adopted in its top, and described upper end electrode (3b) is electrically connected high-tension cable (1).
5. a resonance eliminator according to claim 1 is characterized in that described base (7) adopts aluminium bar to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205174596U CN201845648U (en) | 2010-09-02 | 2010-09-02 | Primary resonance eliminator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205174596U CN201845648U (en) | 2010-09-02 | 2010-09-02 | Primary resonance eliminator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201845648U true CN201845648U (en) | 2011-05-25 |
Family
ID=44040533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205174596U Expired - Lifetime CN201845648U (en) | 2010-09-02 | 2010-09-02 | Primary resonance eliminator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201845648U (en) |
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 |
| CN108963997A (en) * | 2018-08-30 | 2018-12-07 | 北京中联太信科技有限公司 | TXDH type PT direct current decouples harmonic elimination module |
| 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 |
-
2010
- 2010-09-02 CN CN2010205174596U patent/CN201845648U/en not_active Expired - Lifetime
Cited By (4)
| 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 |
| CN108963997A (en) * | 2018-08-30 | 2018-12-07 | 北京中联太信科技有限公司 | TXDH type PT direct current decouples harmonic elimination module |
| 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 |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110525 |