CN1873858A - New type current transformer in high voltage - Google Patents
New type current transformer in high voltage Download PDFInfo
- Publication number
- CN1873858A CN1873858A CN 200510073323 CN200510073323A CN1873858A CN 1873858 A CN1873858 A CN 1873858A CN 200510073323 CN200510073323 CN 200510073323 CN 200510073323 A CN200510073323 A CN 200510073323A CN 1873858 A CN1873858 A CN 1873858A
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- baffle
- current transformer
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- high voltage
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- 238000009413 insulation Methods 0.000 claims abstract description 68
- 238000009422 external insulation Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 239000004020 conductor Substances 0.000 claims description 3
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- 238000009434 installation Methods 0.000 abstract description 2
- 239000011810 insulating material Substances 0.000 description 9
- 239000007787 solid Substances 0.000 description 6
- 230000001052 transient effect Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000003921 oil Substances 0.000 description 3
- 239000002674 ointment Substances 0.000 description 3
- 230000010412 perfusion Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- -1 or electroceramics Polymers 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 206010002820 Antisocial behaviour Diseases 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The new type current transformer in high voltage is composed of inverse vertical type current transformer with no primal diversion body and primal diversion body with independent main insulation. The main insulation is fixed on center hole of the inverse vertical type current transformer, and its insulated external electrode is connected to electrode in high voltage in the inverse vertical type current transformer electrically. The main insulations of primal diversion body and inverse vertical type current transformer can be in structures: capacitance type, stress cone type, gas filled type, or integral cast type. Features are: raised safety of operation, lowered cost of products, convenience for installation and transportation.
Description
Technical field:
The present invention relates to a kind of new type current transformer in high voltage, be used for the current transformation under the high voltage environment, for measuring and the protection use, this invention is applicable to high pressure (mainly being more than 110kV reaches), especially 500kV and above current transformer.
Background technology:
At present, 110kV and above current transformer on the international market, dry insulation condenser type commonly, oil-impregnated paper insulation capacitance type structure and inflatable structure.When electric pressure improved, its volume weight etc. were according to geometric growth, and technology difficulty also significantly increases.
The current transformer of oil-impregnated paper insulation capacitance type structure is used very extensive, but because electric power system does not have the trend of oiling, be to be in to treat obsolete product at present, the product of its 35kV and following electric pressure is substituted by dry insulation condenser type product and epoxy integral cast formula product etc.And the product of its 66kV～220kV electric pressure is also gradually by dry insulation condenser type product with fill SF
6The gas type product substitutes.Gas-filled type instrument transformer market-share growth is also very fast in the product of 330kV and above electric pressure.
Fill SF
6The application of gas type instrument transformer is very wide, but it still exists danger such as blast, contaminated environment.The user is also more and more prudent to its a large amount of uses in recent years.
Second applicant complies with the electric Power Reform needs at the novel dry type electric capacity shape current transformer of investment research in 1997 exploitation, and the user also welcomes very much, and it is typical U type structure, and secondary coil places the bottom side of U type structure.When electric pressure improves, need to become geometric progression to increase with material, technology difficulty also increases very fast, if to such an extent as to the structure and the technology of 110kV, 220kV product are simply amplified, when being used to make 330kV, 500kV current transformer, its security reliability falls under suspicion, if introduce to the market rashly, is the extreme irresponsibility to the user.
The current transformer Main Insulation Structure of Electric mode of present 110kV and above electric pressure mainly contains two kinds: 1, on baffle, or on the transition zone outside baffle, make condenser type main insulation, a baffle is introduced the ground connection position, and secondary coil is set in the ground connection position in the main insulation outside of a baffle.2, another kind is inverted, and it is that secondary coil is placed the high-pressure side, and measuring lead wire causes the ground connection position in conduit, the isolation of will insulating reliably of secondary coil, measuring lead wire etc. and high pressure position.
The current transformer of these two kinds of structures all is to bring up to 220kV and when above, technological requirement, product height, product cost etc. all can increase considerably, and not only cause difficulty to transportation, also make the security reliability of product be affected in electric pressure.
The chain insulation that also has a kind of there be limited evidence currently of to adopt, once in 63kV and following electric pressure, adopted, this structure is wrapping part insulation on the secondary coil of ring-type, baffle of coiling on secondary coil then, wrapping remains main insulation on baffle again, and structure presents the figure of eight.This type structure is owing to complex process, and reasons such as Electric Field Distribution more complicated are seldom seen on market at present.
Somebodys in 2004 made a kind of high-tension current inductor of tandem formula, its principle be adopt 2 independently the condenser type current transformer combine up and down, the secondary coil of its middle and upper part instrument transformer has only one, the high-pressure side equipotential of end screen, shell and the bottom current transformer of its condenser type insulation, in addition behind the secondary output lead coiling multiturn of top instrument transformer as a baffle of bottom current transformer, the secondary coil of bottom instrument transformer is made according to system requirements.This type instrument transformer structure is very novel, but does not have practicality.
This tandem formula high-tension current inductor, at first, the secondary coil output capacity of this electromagnetic transformer is very little, generally all can not meet consumers' demand, if use or acceptable as laboratory; Secondly,, require mostly to have TPY level transient state coil for the instrument transformer of 220kV and above electric pressure, or other TP level transient state coil, and this tandem formula high-tension current inductor possibly can't be realized the requirement of transient protection.This cascade type instrument transformer is because there is the saturated problem of transient state in the secondary coil of top instrument transformer under short-circuit condition; its output drives the secondary coil of bottom instrument transformer more then; therefore its transient protection requires and may realize, or realizes that difficulty is very big.Air gaps is unshakable in one's determination makes if the secondary coil of its top instrument transformer adopts, perhaps can realize the linearity output of top secondary coil, but its output capacity is very little, under it drives, the secondary output capacity that the bottom instrument transformer is measured coil is littler, and the transient state coil of bottom instrument transformer can't be realized in the same old way.
Summary of the invention:
The invention provides a kind of new type current transformer in high voltage, overcome the defective of above-mentioned various structure high-tension current inductors, and be to realize easily, technological requirement is not high yet, make simple, security reliability is also high, if after adopting special processing, and also can normal transport for 330kV and above product.
New type current transformer in high voltage of the present invention, do not have the inverted type current transformer of a baffle and have an independent baffle that insulate to form by one, it does not have the inverted type current transformer of a baffle to be in lower position, its bottom is an earth potential, a baffle that has independent insulation passes the centre bore of inverted instrument transformer and is positioned at upper position, a baffle that has independent insulation is fixed in the centre bore of inverted type current transformer, and its insulating outer layer electrode forms conductor with the high-field electrode of inverted instrument transformer and is connected.
This new type current transformer in high voltage, its baffle has independently main insulation, external insulation.
This new type current transformer in high voltage, its both sides insulation arm that has a baffle of independent insulation is that 0 degree is to 150 degree with the angle of horizontal direction respectively.
This new type current transformer in high voltage, its insulation arm top, baffle both sides can not connect, and has the connecting box of a baffle of multiturn to connect by the connection of insulation connecting plate or by interior.
This new type current transformer in high voltage, the main insulation of its baffle directly are produced on the baffle or are produced on the outer transition zone of baffle.
This new type current transformer in high voltage, the main insulation of its baffle are condenser type, gas-filled type, stress cone type or integral cast formula.
This new type current transformer in high voltage, it does not have the inverted type current transformer high-pressure side of a baffle to have the centre bore that can pass a baffle that has insulation.
This new type current transformer in high voltage, its main insulation that does not have the inverted type current transformer of a baffle is condenser type, gas-filled type, stress cone type or integral cast formula.
This new type current transformer in high voltage, it is not have the main insulation of inverted type current transformer of a baffle and the main insulation of a baffle to seal respectively, or adopts same sealing system.
The present invention is that the secondary coil with a high-tension current inductor removes, and utilizes its ground connection position to be fixed in the high-pressure side centre bore of another inverted type current transformer (removing its baffle), forms new current transformer.
New type current transformer in high voltage is equivalent to the current transformer series operation of two low voltage grades, reduce product cost greatly, technology difficulty also reduces significantly, if when design, the baffle that consideration has its top insulation serves as that axle rotates with bottom inverted transformer high voltage side centre bore axis, when transportation, a baffle is gone to towards the below to reduce height, and when actual installation, it is resetted and can normally move.In addition, if the inverted transformer high voltage side center-hole diameter in bottom is enough big, two parts also can separately transport up and down.
The main insulation of the baffle in indication of the present invention top and the Main Insulation Structure of Electric of bottom inverted type current transformer can adopt condenser type, gas-filled type, stress cone type or integral cast formula respectively, and possible alternate manner.What enumerate in the description of drawings only is part-structure.
Description of drawings:
Fig. 1 is the several with reference to form of a baffle insulation system of the present invention.
Fig. 2 is the several with reference to form of inverted type current transformer of the present invention.
Fig. 3 is first kind of embodiment of the present invention (insulation of a baffle and the insulation of inverted instrument transformer seal respectively)
Fig. 4 is second kind of embodiment of the present invention (same sealing is adopted in the insulation of a baffle and the insulation of inverted instrument transformer)
Fig. 5 is the several with reference to form of a baffle profile of the present invention.
Fig. 6 is three kinds of top connected modes that a baffle of the present invention can adopt.
Fig. 7 is the travel position after reducing height that the embodiment of the invention can adopt.
Fig. 1 is the several with reference to form of a baffle insulation system of the present invention, and one time baffle adopts the U-shaped structure.
The capacitance type structure 2 that main insulation adopts among the A figure directly is wound on baffle 1, perhaps is wound on the stay pipe of a baffle 1 of parcel, and external insulation 3 can adopt silicon rubber, or electroceramics, or epoxy resin, perhaps other insulating material;
The stress cone type structure 2 that main insulation adopts among the B figure, directly be sleeved on the baffle 1 that has insulation, external insulation 3 can adopt silicon rubber, or electroceramics, or epoxy resin, perhaps other insulating material, this baffle 1 that has insulation also can directly adopt the cable that removes crust and outer semiconducting layer, and main insulation also can adopt the capacitance type structure in the cable termination in this structure;
Fig. 2 is the several with reference to form of inverted type current transformer of the present invention.
A figure main insulation is inflatable structure, its box body that secondary coil 1 is housed is fixed on the base by centre pipe 4, centre bore 3 diameters of high pressure box body 2 are bigger, and it is more better that both sides present bell mouth shape, high pressure box body 2 is fixed on the base by the sleeve pipe that has external insulation 5, and SF can be filled in the middle cavity position
6Gas, or other insulating gas, or insulating oil, or insulation ointment, or the solid insulating material of perfusion, or the materials such as solid insulating material of coiling;
B figure main insulation is suspension ring shape capacitance type structure, its box body that secondary coil 1 is housed is fixed on the base by centre pipe 4, centre bore 3 diameters of high pressure box body 2 are bigger, and it is more better that both sides present bell mouth shape, high pressure box body 2 is fixed on the base by the sleeve pipe that has external insulation 5, capacitance plate 6 is wound on centre pipe and the secondary coil box body, and SF can be filled in the middle cavity position
6Gas, or other insulating gas, or insulating oil, or insulation ointment, or the solid insulating material of perfusion, or the materials such as solid insulating material of coiling.
Fig. 3 is first kind of embodiment of the present invention (insulation of a baffle and the insulation of inverted instrument transformer seal respectively)
Baffle described in Fig. 1 and insulation thereof are completed, and the inverted type current transformer among Fig. 2 are completed, independently finish sealing separately after, formation is assembled together.
Be the centre bore that the A among Fig. 1 is passed B among Fig. 2 in the illustration, and secure fixation, simultaneously the insulating outer layer electrode of A carried out reliable conductor with the high-field electrode of B and be connected.
Fig. 4 is second kind of embodiment of the present invention (same sealing is adopted in the insulation of a baffle and the insulation of inverted instrument transformer)
Baffle described in Fig. 1 and insulation thereof are completed, and the inverted type current transformer among Fig. 2 is completed, after being assembled together, unify sealing again.
Be the centre bore that the C among Fig. 1 is passed A among Fig. 2 in the illustration, and secure fixation, finish sealing after, SF in middle cavity
6Gas, or other insulating material.
Fig. 5 is the several with reference to form of a baffle profile of the present invention.
A figure be its two arm by the variation of in-line to the U font, both arms can equate with the angle of horizontal axis, also can be unequal, its angle also can be greater than 90 degree;
B figure is similar to traditional porcelain overcoat oil-paper condenser type current transformer, and its insulation both arms are among insulator.
Fig. 6 is three kinds of top connected modes that a baffle of the present invention can adopt.
A figure is that baffle two arm top of expression can be without any connection, for example just can not do any connection during the in-line among the A in being in Fig. 5;
B figure is that mechanical fixation can directly be carried out with connecting plate in baffle two arm tops of expression, and the high-pressure section on its two arms top answers mutually insulated to isolate.
C figure is that mechanical fixation is carried out by terminal box in baffle two arm tops of expression, and can finish the operation of falling the circle of a winding in terminal box, and the high-pressure section on its two arms top answers mutually insulated to isolate.
Fig. 7 is the travel position after reducing height that the embodiment of the invention can adopt.
End view when the front view when A figure is transportation, B figure are transportation.Being exactly in when transportation, serves as that axle is rotated to shown position with the baffle in top with the line of symmetry of the centre bore of bottom inverted type current transformer, and the height of product can reduce greatly when transportation like this.After transporting the scene to, the baffle in top being resetted can the normal mounting operation again.
Certainly, also two parts can be transported respectively during transportation, assemble again after transporting the scene to.
Embodiment:
1, selected concrete frame mode is determined top and the bottom version separately, and we describe Figure 3 shows that example at this;
2, select a winding according to the requirement of rated current, answer the requirement of withstand voltage to determine its external diameter according to rated voltage and a winding simultaneously, just determine the internal diameter of bottom instrument transformer centre bore;
3, according to the requirement of secondary coil and the requirement of withstand voltage, determine the relevant size of the inverted instrument transformer in bottom etc.;
4, top and the bottom are carried out detailed calculated respectively, whether the voltage distribution is closed in the school reasonable, can adjust to reach the most rational insulation utilization relevant size simultaneously;
5, make and assemble, test;
6, when transportation, can transport respectively, assemble again after transporting the scene to, or adopt mode shown in Figure 7 to transport.
Claims (9)
1, new type current transformer in high voltage, do not have the inverted type current transformer of a baffle and have an independent baffle that insulate to form by one, it is characterized in that: do not have the inverted type current transformer of a baffle to be in lower position, its bottom is an earth potential, a baffle that has independent insulation passes the centre bore of inverted instrument transformer and is positioned at upper position, a baffle that has independent insulation is fixed in the centre bore of inverted type current transformer, and its insulating outer layer electrode forms conductor with the high-field electrode of inverted instrument transformer and is connected.
2, new type current transformer in high voltage according to claim 1 is characterized in that a baffle has independently main insulation, external insulation.
3, new type current transformer in high voltage according to claim 1, the both sides insulation arm that it is characterized in that having a baffle of independent insulation is that 0 degree is to 150 degree with the angle of horizontal direction respectively.
4, new type current transformer in high voltage according to claim 1 is characterized in that insulation arm top, baffle both sides can not connect, and has the connecting box of a baffle of multiturn to connect by the connection of insulation connecting plate or by interior.
5, new type current transformer in high voltage according to claim 1, the main insulation that it is characterized in that a baffle directly are produced on the baffle or are produced on the outer transition zone of baffle.
6, new type current transformer in high voltage according to claim 1, the main insulation that it is characterized in that a baffle is condenser type, gas-filled type, stress cone type or integral cast formula.
7, new type current transformer in high voltage according to claim 1 is characterized in that not having the inverted type current transformer high-pressure side of a baffle to have the centre bore that can pass a baffle that has insulation.
8, new type current transformer in high voltage according to claim 1, it is characterized in that not having the main insulation of the inverted type current transformer of a baffle is condenser type, gas-filled type, stress cone type or integral cast formula.
9, new type current transformer in high voltage according to claim 1 is characterized in that not having the main insulation of inverted type current transformer of a baffle and the main insulation of a baffle to seal respectively, or adopts same sealing system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510073323 CN1873858A (en) | 2005-06-02 | 2005-06-02 | New type current transformer in high voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510073323 CN1873858A (en) | 2005-06-02 | 2005-06-02 | New type current transformer in high voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1873858A true CN1873858A (en) | 2006-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510073323 Pending CN1873858A (en) | 2005-06-02 | 2005-06-02 | New type current transformer in high voltage |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104576007A (en) * | 2015-01-12 | 2015-04-29 | 广东电网有限责任公司电力科学研究院 | Flow-guide radiation combined transformer for high-voltage complete device |
| WO2016026409A1 (en) * | 2014-08-18 | 2016-02-25 | 中国电力科学研究院 | High-current synthesis circuit of electronic current transformer |
| CN109935461A (en) * | 2017-12-15 | 2019-06-25 | 大连北方互感器集团有限公司 | A kind of Combined type current transformer |
-
2005
- 2005-06-02 CN CN 200510073323 patent/CN1873858A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016026409A1 (en) * | 2014-08-18 | 2016-02-25 | 中国电力科学研究院 | High-current synthesis circuit of electronic current transformer |
| CN104576007A (en) * | 2015-01-12 | 2015-04-29 | 广东电网有限责任公司电力科学研究院 | Flow-guide radiation combined transformer for high-voltage complete device |
| CN109935461A (en) * | 2017-12-15 | 2019-06-25 | 大连北方互感器集团有限公司 | A kind of Combined type current transformer |
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Open date: 20061206 |