CN201229847Y - Weak output capacitor type voltage mutual inductor - Google Patents
Weak output capacitor type voltage mutual inductor Download PDFInfo
- Publication number
- CN201229847Y CN201229847Y CNU2008200719999U CN200820071999U CN201229847Y CN 201229847 Y CN201229847 Y CN 201229847Y CN U2008200719999 U CNU2008200719999 U CN U2008200719999U CN 200820071999 U CN200820071999 U CN 200820071999U CN 201229847 Y CN201229847 Y CN 201229847Y
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- CN
- China
- Prior art keywords
- low
- voltage
- field electrode
- transformer
- capacitor
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- 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.)
- Expired - Lifetime
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- 239000003990 capacitor Substances 0.000 title claims abstract description 36
- 238000009413 insulation Methods 0.000 claims abstract description 10
- 229910052573 porcelain Inorganic materials 0.000 claims abstract description 10
- 238000004804 winding Methods 0.000 claims abstract description 8
- 238000010276 construction Methods 0.000 claims description 5
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229920006267 polyester film Polymers 0.000 claims description 3
- -1 polypropylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Transformers For Measuring Instruments (AREA)
Abstract
The utility model relates to a weak output capacitor voltage transformer which belongs to the field of capacitor voltage transformer. A bell-shaped high-voltage electrode is arranged at the upper part of a porcelain sleeve, and connected with the upper flange of the sleeve in an airtight way; the top of the high-voltage electrode is provided with an SF6 air pressure releaser; the lower flange of the sleeve is arranged on a transformer base to form an airtight structure; the transformer base is provided with a low-voltage electrode mast which is higher than the surface of the upper flange of the porcelain sleeve; the low-voltage electrode mast is fixedly connected with a cylindrical low-voltage electrode by an insulation washer; a compressed air capacitor is arranged between the high-voltage electrode and the low-voltage electrode; a low-voltage electrode lead goes through the low-voltage electrode mast and the transformer base, enters into a junction box through an airtight insulation jack panel, is connected with a grounded low voltage arm capacitor, a compensation reactor and a medium-voltage transformer; a secondary winding of the medium-voltage transformer is connected with a damper. The voltage transformer has the advantages of material saving, lower manufacturing cost and very good energy saving effect.
Description
Technical field
The utility model relates to capacitance type potential transformer, especially uses the weak output capacitance formula voltage transformer of compressed gas condenser, belongs to the electric power mutual-inductor technical field.
Background technology
110kV and above power network use capacitance type potential transformer in a large number at present.Capacitance type potential transformer is made up of voltage-dividing capacitor unit and electromagnetic unit, and the voltage-dividing capacitor unit comprises high-voltage arm coupling capacitor and low-voltage arm capacitor, and electromagnetic unit comprises compensation reactor, middle pressure transformer and damper.Standard GB/T4703-2001 regulation capacitance type potential transformer secondary rated voltage is
And 100V, secondary rated capacity recommendation is not less than 25VA, and the capacitance standard value of 110kV high-voltage arm coupling capacitor is 0.02 μ F, and 220kV is 0.01 μ F, and 330kV, 500kV, 750kV are 0.005 μ F.Capacitance type potential transformer not can with line capacitance and switch fracture capacitor resonance, overall cost is lower than electromagnetic potential transformer, is used widely at high pressure and supergrid.Along with the extensive use in power industry of electronic technology and digital technology, secondary device no longer obtains driving power from instrument transformer, and instrument transformer only uses as signal converter.So, secondary voltage reaches
And 100V, the capacitance type potential transformer that the secondary capacity reaches 300VA will cause the very big waste of the resource and the energy.The factory of some capacitance type potential transformers adopts the method that reduces high-voltage arm coupling capacitor capacitance and reduce the secondary rated voltage to economize on resources at present, but the high-voltage arm coupling capacitor of low capacity is subjected to the environment stray capacitance influences easily, and accuracy of instrument transformers is descended.
Summary of the invention
The utility model provides a kind of weak output capacitance formula voltage transformer, the purpose stray capacitance influences that controls environment when being to reduce the coupling capacitor capacitance, guarantee the accuracy of capacitance type potential transformer, this instrument transformer is not subjected to the environment stray capacitance influences, secondary voltage output can have been saved signal transformer directly as the input signal of secondary electron device line.
The technical scheme that its technical problem that solves the utility model adopts is: the high-field electrode of bell shape is installed in the top of porcelain bushing, is tightly connected with sleeve pipe upper flange shape, at the high-field electrode top SF is housed
6The gas pressure release, the sleeve pipe lower flange is installed on the instrument transformer base, also form airtight construction, the low-field electrode pillar is housed on the instrument transformer base, the low-field electrode pillar exceeds the porcelain bushing upper flange surface, by the fixedly connected cylindric low-field electrode of insulation cushion, between high-field electrode and low-field electrode, form compressed gas condenser, low-field electrode lead-in wire pass low-field electrode prop up lean on the instrument transformer base after enter terminal box by airtight insulation joint dish, be connected with the low-voltage arm capacitor of ground connection, also be connected with compensation reactor, be connected with middle pressure transformer, pressure transformer secondary winding is connected to damper in this.
The low-voltage arm capacitor is composed in parallel by the polyester film capacitor of positive temperature coefficient and the polypropylene screen capacitor of negative temperature coefficient, and the temperature coefficient after the combination is near the temperature coefficient that equals compressed gas condenser.
The utility model makes the following compressed gas condenser of electricity capacity 300pF replace coupling capacitor to make capacitance type potential transformer, simultaneously rated secondary voltage from
Be reduced to 100V
Wherein compressed gas condenser is the low-field electrode pillar of packing in high-intensity insulating sleeve, and cylindric low-field electrode is installed on pillar, and low-field electrode exceeds insulating sleeve and insulate with the low-field electrode pillar.The high-field electrode of bell shape is installed at insulating sleeve upper flange place, is formed gas capacitor with low-field electrode on the one hand, sealed the sleeve pipe top on the other hand and formed airtight construction.Sleeve pipe lower flange and low-field electrode pillar are installed on the base of instrument transformer, also form airtight construction.In insulating sleeve, charge into dry SF
6Gas, the pressure under the temperature remains within the normal range are 0.35MPa～0.4Mpa.The voltage of the voltage-dividing capacitor output of weak output capacitance formula voltage transformer is not more than 50V, can use the electromagnetic unit device that volume is little, capacity is low.
One of the beneficial effects of the utility model are to have saved a large amount of insulating material, metal material and the expensive capacitor core process equipment of making big capacity coupling capacitor and large power, electrically magnetic cell needs, have saved material, have reduced manufacturing cost.Two of beneficial effect is the fail safes that improved equipment, and compressed gas condenser has the self restoring insulation structure, and bearing still can safe operation behind the over-voltage breakdown.Consumed power hardly when three of beneficial effect is the operation of weak output capacitance formula voltage transformer has fabulous energy-saving effect.
Description of drawings
Fig. 1 is a cross-sectional view of the present utility model.
Among the figure: 1.SF
6Gas pressure release, 2. low-field electrode, 3. high-field electrode, 4. insulation cushion, 5. sleeve pipe upper flange, 6. porcelain bushing, 7. low-field electrode pillar, 8. low-field electrode goes between, 9. sleeve pipe lower flange, 10. low-voltage arm capacitor, 11. compensation reactor, 12. middle pressure transformer, 13. dampers, 14. instrument transformer bases.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
In Fig. 1, the high-field electrode 3 of bell shape is installed in the top of porcelain bushing 6, is tightly connected with sleeve pipe upper flange 5 shapes, at the high-field electrode top SF is housed
6Gas pressure release 1, the burst disk of pressure releaser made can be broken when gas pressure surpasses 0.8Mpa, discharge high-pressure gas, sleeve pipe lower flange 9 is installed on the instrument transformer base 14, also form airtight construction, low-field electrode pillar 7 is housed on the instrument transformer base, the low-field electrode pillar exceeds the porcelain bushing upper flange surface, fixing cylindric low-field electrode 2 by insulation cushion 4, between high-field electrode 3 and low-field electrode 2, form compressed gas condenser, under the shielding of high-field electrode, capacitance is not subjected to the external electromagnetic environmental impact.Low-field electrode lead-in wire 8 pass low-field electrode prop up lean on 7 and instrument transformer base 14 backs enter terminal box by airtight insulation joint dish, be connected with the low-voltage arm capacitor 10 of ground connection, the low-voltage arm capacitor is composed in parallel by the polyester film capacitor of positive temperature coefficient and the polypropylene screen capacitor of negative temperature coefficient, temperature coefficient after the combination is near the temperature coefficient that equals compressed gas condenser, the output of capacitor voltage divider secondary voltage is not more than 50V, receive middle pressure transformer 12 by compensation reactor 11, a secondary winding of middle pressure transformer is connected to damper 13, in order to eliminate contingent ferro resonance in the circuit, other secondary winding output of middle pressure transformer is measured and is used voltage signal, and rated value is
Be filled with dry SF in the porcelain bushing
6Pressure under the gas, normal temperature is 0.35MPa～0.4Mpa.
In the embodiment in figure 1, the rated primary voltage of capacitance type potential transformer is
The capacitance of the high-voltage arm capacitor of being made up of high-field electrode 3 and low-field electrode 2 is 168.17pF, and the capacitance of low-voltage arm capacitor 10 is 0.9246 μ F, and the capacitor voltage divider secondary voltage is output as 23.1V, is equivalent to 40V/
By a reactance value is 3442 Ω (50Hz), the reactor of winding band tap is received middle pressure transformer (12), quality factor q under the reactor 50Hz is not less than 40, the voltage ratio of middle pressure transformer is got 10:1, rated voltage 50V, the tap of a winding band, excitation impedance is not less than 100k Ω, the secondary rated voltage
In pressure transformer three secondary winding are arranged, one of them is connected to 13, one of dampers as the output of measurement and metrology voltage signal, another is as the output of protection voltage signal.The phase difference of capacitance type potential transformer is adjusted by conversion reactor tapping.Ratio difference is by a tapping adjustment of pressure transformer in the conversion.Can reach 0.2 grade of accuracy requirement in load resistance 10k Ω～100k Ω scope.
Claims (2)
1, a kind of weak output capacitance formula voltage transformer, it is characterized in that: the high-field electrode of bell shape is installed in the top of porcelain bushing, is tightly connected with sleeve pipe upper flange shape, at the high-field electrode top SF is housed
6The gas pressure release, the sleeve pipe lower flange is installed on the instrument transformer base, also form airtight construction, the low-field electrode pillar is housed on the instrument transformer base, the low-field electrode pillar exceeds the porcelain bushing upper flange surface, by the fixedly connected cylindric low-field electrode of insulation cushion, between high-field electrode and low-field electrode, form compressed gas condenser, low-field electrode lead-in wire pass low-field electrode prop up lean on the instrument transformer base after enter terminal box by airtight insulation joint dish, be connected with the low-voltage arm capacitor of ground connection, also be connected with compensation reactor, be connected with middle pressure transformer, pressure transformer secondary winding is connected to damper in this.
2, weak output capacitance formula voltage transformer according to claim 1, it is characterized in that: the low-voltage arm capacitor is composed in parallel by the polyester film capacitor of positive temperature coefficient and the polypropylene screen capacitor of negative temperature coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200719999U CN201229847Y (en) | 2008-06-18 | 2008-06-18 | Weak output capacitor type voltage mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200719999U CN201229847Y (en) | 2008-06-18 | 2008-06-18 | Weak output capacitor type voltage mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201229847Y true CN201229847Y (en) | 2009-04-29 |
Family
ID=40634789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200719999U Expired - Lifetime CN201229847Y (en) | 2008-06-18 | 2008-06-18 | Weak output capacitor type voltage mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201229847Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102479607A (en) * | 2010-11-27 | 2012-05-30 | 江苏思源赫兹互感器有限公司 | Dividing type electronic voltage transformer of single-phase capacitor |
| CN102479610A (en) * | 2010-11-26 | 2012-05-30 | 江苏思源赫兹互感器有限公司 | Combined electronic mutual inductor |
-
2008
- 2008-06-18 CN CNU2008200719999U patent/CN201229847Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102479610A (en) * | 2010-11-26 | 2012-05-30 | 江苏思源赫兹互感器有限公司 | Combined electronic mutual inductor |
| CN102479607A (en) * | 2010-11-27 | 2012-05-30 | 江苏思源赫兹互感器有限公司 | Dividing type electronic voltage transformer of single-phase capacitor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: JILIN PROV. POWER SCIENCE INST. CO., LTD. STATE EL Effective date: 20120824 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20120824 Address after: 130021 Jilin City, Changchun province people's street, No. 4433 Co-patentee after: Jilin Academy of Electric Power Science Patentee after: Electric Power Research Institute of Jilin Electric Power Company Co-patentee after: State Grid Corporation of China Address before: 130021 Jilin City, Changchun province people's street, No. 4433 Patentee before: Electric Power Research Institute of Jilin Electric Power Company |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090429 |