CN204347231U - A kind of butterfly bus ring for DC current transformer check system - Google Patents
A kind of butterfly bus ring for DC current transformer check system Download PDFInfo
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- CN204347231U CN204347231U CN201420748291.8U CN201420748291U CN204347231U CN 204347231 U CN204347231 U CN 204347231U CN 201420748291 U CN201420748291 U CN 201420748291U CN 204347231 U CN204347231 U CN 204347231U
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- landolsring
- bus ring
- input end
- current
- butterfly
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Abstract
The utility model discloses a kind of butterfly bus ring for DC current transformer check system, it comprise two identical and surround quadrilateral and the landolsring of symmetric offset spread in the same plane, described breach opens the same one end at two landolsring adjacent edges, and same one end of this adjacent edge is input end, the other end is output terminal; The input end of output termination second landolsring of the first landolsring, the input end of the first landolsring and the output terminal of the second landolsring are connected respectively on two terminals of DC current source output terminal.When the DC current that DC current source sends flows in this butterfly bus ring, the Accuracy of asymmetric external magnetic field to the comparator for direct current and tested DC current transformer that are arranged on center position of generation is very little.
Description
Technical field
The utility model relates to a kind of bus ring, particularly a kind of butterfly bus ring for DC current transformer check system.
Background technology
DC current check system is as the calibration equipment of various DC current transformer, in a lot of fields, as being widely used in trans-regional HVDC (High Voltage Direct Current) transmission system, non-ferrous metal electro-chemical systems, particle accelerator etc., its performance is subject to the great attention of power department.
Core component in DC current check system comprises bus, standard and DC current source.
Bus refers to the bonding conductor of voltage power distribution equipment at different levels in electric substation, and the bonding conductor of the electrical equipment such as transformer and corresponding power distribution equipment.When the two ends of bus are connected to the outflow of bus current end of DC current source output terminal and electric current flows on end, when forming ring-type circuit, this circuit is called bus ring.Because bus ring is usual in one plane, so be usually referred to as planar bus ring.
Standard is a High-accuracy direct current current comparator, more than high two grades of the tested DC current transformer of its ratio of precision (being usually better than 0.005%).
DC current source can send high stability, value from zero to the DC current of kilo-ampere, and it outputs to bus by outflow of bus current end, then flows into end along bus inflow current.
During verification, standard and tested DC current transformer are connected on a bus, both primary currents are equal, are the DC current along bus flowing.Check system can measure the two secondary current exported, and goes out the indexs such as the precision of tested DC current transformer according to this mathematic interpolation, completes verifying work.
Because the precision of standard and tested DC current transformer is all very high, its impact being subject to asymmetric external magnetic field is comparatively large, and the magnetic field that asymmetric external magnetic field main source produces for the bus section, busbar section (usually this section of bus being called loop line) turning back to DC current source.One of target of verifying work is exactly that the impact of the asymmetric external magnetic field making loop line produce as far as possible drops to minimum.The existing bus ring reducing the impact of asymmetric external magnetic field has cross type and two kinds, series parallel structure type, but for ensureing that it reduces the effect of external magnetic field impact, installation requirement is firmly accurate, and step is very loaded down with trivial details, therefore can only be used in laboratory, be difficult to use in the occasion such as field or industry spot (see document [1] M. Zhu and K. Xu. A calibrating device for large direct current instruments up to 320 kiloampere-turns [J]. IEEE Trans. Instrument. & Meas., 1998, 47 (2), 711-714, [2] Yuan Luming. electromagnetic measurement. Beijing: China Machine Press. 1980,276-293, [3] Shao Haiming. the research of national D.C. high-current measurement standard. China's metering, 2014 (3): 72-75).
Summary of the invention
Problem to be solved in the utility model, is just to provide a kind of butterfly bus ring for DC current transformer check system.When the electric current that DC current source sends runs in this bus ring, the asymmetric external magnetic field of generation is very little, therefore very little to the Accuracy of standard and tested DC current transformer; In addition, the installation steps of bus ring are comparatively simple, can meet the requirement of most of actual verifying work.
Solve the problems of the technologies described above, the technical solution adopted in the utility model is as follows:
A kind of butterfly bus ring for DC current transformer check system, it is characterized in that: comprise two identical and surround quadrilateral and the landolsring of symmetric offset spread in the same plane, described breach opens the same one end at two landolsring adjacent edges, and one end of this adjacent edge is input end, the other end is output terminal; The input end of output termination second landolsring of the first landolsring, the input end of the first landolsring and the output terminal of the second landolsring are connected respectively on two terminals of DC current source output terminal.
Preferably, two described landolsrings are parallel with near the bending edge of input end away from the bending edge of input end, both length ratios are between 0.9-1.1.
Preferably, the adjacent edge of two described landolsrings and the opposite side of this landolsring is isometric, equal 1 away from the bending edge of input end with near the bending edge length ratio of input end.
Preferably, the length of the adjacent edge of two described landolsrings and the opposite side of this breach bus ring is between 5m to 15m; Length away from the bending edge of input end is greater than 5m.
Beneficial effect: when DC current flows in this butterfly bus ring, cancel out each other in the magnetic field that loop line electric current produces, the large high attenuation of intensity of the asymmetric external magnetic field suffered by center position, it also reduces the impact of the precision of the standard and tested DC current transformer that are arranged on center position thereupon greatly; This bus ring installation steps are simple, can be used for the occasion of the actual verifications such as industry spot.
Accompanying drawing explanation
Fig. 1 is the practical circuit figure of a plane quadrilateral bus ring in the utility model butterfly bus ring;
Fig. 2 is a practical circuit figure of the utility model butterfly bus ring.
Embodiment
Below in conjunction with accompanying drawing and example, the utility model is described in further detail.
The utility model provides a kind of butterfly bus ring for DC current transformer check system, it is characterized in that: comprise two identical and surround quadrilateral and the landolsring of symmetric offset spread in the same plane, described breach opens the same one end at two landolsring adjacent edges, and one end of this adjacent edge is input end, the other end is output terminal; The input end of output termination second landolsring of the first landolsring, the input end of the first landolsring and the output terminal of the second landolsring are connected respectively on two terminals of DC current source output terminal.
Preferably, two described landolsrings are parallel with near the bending edge of input end away from the bending edge of input end, both length ratios are between 0.9-1.1.
Preferably, the adjacent edge of two described landolsrings and the opposite side of this landolsring is isometric, equal 1 away from the bending edge of input end with near the bending edge length ratio of input end.
Preferably, the length of the adjacent edge of two described landolsrings and the opposite side of this breach bus ring is between 5m to 15m; Length away from the bending edge of input end is greater than 5m.
The structure of a plane quadrilateral bus ring in butterfly bus ring provided by the utility model as shown in Figure 1.Described plane quadrilateral bus ring is composed in series by a, b, c, d tetra-sections of buses.Preferably, the lenth ratio of b and d is between 0.9 to 1.1.
As shown in Figure 2, two symmetric offset spread, plane quadrilateral bus ring in the same plane forms butterfly bus ring jointly.
The course of work of the butterfly bus ring for DC current transformer check system provided by the present invention is as follows:
The DC current I1 that DC current source output terminal exports, by stube cable p1, enters the a1 section of first plane quadrilateral bus ring, successively by a1, b1, c1, d1 section; Enter the a2 section of second plane quadrilateral bus ring subsequently, and successively by a2, b2, c2, d2 bus section, busbar section, finally by stube cable p2, get back to the current input terminal of DC current source.
During verification, standard and tested DC current transformer are installed in butterfly bus Ring current distribution position (being namely positioned at the middle part of a1, a2 section bus).Electric current through standard and tested DC current transformer sensing iron core is the twice (2I1) of DC current source output current I1, and therefore the primary current of comparator for direct current and tested DC current transformer is 2I1.C1, c2 section is loop line, and the electric current flowing through c1, c2 two sections of buses is loop line electric current.
Because the loop line electric current of c1, c2 section is all equal, and the distance of these two sections of loop line distance butterfly bus ring centers is also equal, so cancel out each other in bus Ring current distribution position in the magnetic field that loop line electric current produces, make the large high attenuation of intensity of the asymmetric external magnetic field of center position.
Each bus section, busbar section a1, a2, b1, b2, c1, c2, d1 of butterfly bus ring are relevant with the factor such as accuracy requirement, the size of output current I1, the surrounding environment (as topographic and geologic condition, buildings material-structure) of butterfly bus ring of mark device and tested DC current transformer with the length of d2 section, and above-mentioned factors all has influence on the damping capacity of asymmetric external magnetic field strength.Select usually to adopt experimental technique to determine during each segment length, such as: adopt the superhigh precision standard (as superhigh precision full-shield current comparision system standard or superhigh precision shunt group) do not affected by asymmetric external magnetic field to form comparison system with comparator for direct current, the bus ring being arranged on different size is tested, determines the size of bus ring.Generally, the length of a1, a2, c1, c2 section is 5m to 15m; The length of b1, b2, d1, d2 section is greater than 5m.
Below by way of an embodiment, the utility model is further detailed.
A kind of parameter of the butterfly bus ring for DC current transformer check system is as follows: a1, c1, a2, c2 are 12m; B1, b2 are 10m; D1, d2 are all between 9m to 11m.As the ratio precision 0.001% of the comparator for direct current of standard.
Actual measurement shows, when the numerical value of DC current I1 flowing through bus ring is between 0 to 6kA, asymmetric external magnetic field is on the not impact on 0.001% order of magnitude of the precision of the standard and tested DC current transformer that are arranged on center position.That is, its ratio precision is not change within the scope of above-mentioned I1 current values, is still 0.001%.
Claims (4)
1. the butterfly bus ring for DC current transformer check system, it is characterized in that: comprise two identical and surround quadrilateral and the landolsring of symmetric offset spread in the same plane, described breach opens the same one end at two landolsring adjacent edges, and one end of this adjacent edge is input end, the other end is output terminal; The input end of output termination second landolsring of the first landolsring, the input end of the first landolsring and the output terminal of the second landolsring are connected respectively on two terminals of DC current source output terminal.
2. the butterfly bus ring for DC current transformer check system according to claim 1, is characterized in that: two described landolsrings are parallel with near the bending edge of input end away from the bending edge of input end, both length ratios are between 0.9-1.1.
3. the butterfly bus ring for DC current transformer check system according to claim 2, is characterized in that: the adjacent edge of two described landolsrings and the opposite side of this landolsring is isometric, equal 1 away from the bending edge of input end with near the bending edge length ratio of input end.
4. the butterfly bus ring for DC current transformer check system according to claim 1-3 any one, is characterized in that: the length of the adjacent edge of two described landolsrings and the opposite side of this breach bus ring is between 5m to 15m; Length away from the bending edge of input end is greater than 5m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420748291.8U CN204347231U (en) | 2014-12-04 | 2014-12-04 | A kind of butterfly bus ring for DC current transformer check system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420748291.8U CN204347231U (en) | 2014-12-04 | 2014-12-04 | A kind of butterfly bus ring for DC current transformer check system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204347231U true CN204347231U (en) | 2015-05-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420748291.8U Withdrawn - After Issue CN204347231U (en) | 2014-12-04 | 2014-12-04 | A kind of butterfly bus ring for DC current transformer check system |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104360302A (en) * | 2014-12-04 | 2015-02-18 | 广东电网有限责任公司电力科学研究院 | Butterfly bus ring for direct-current transformer calibration system |
-
2014
- 2014-12-04 CN CN201420748291.8U patent/CN204347231U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104360302A (en) * | 2014-12-04 | 2015-02-18 | 广东电网有限责任公司电力科学研究院 | Butterfly bus ring for direct-current transformer calibration system |
| CN104360302B (en) * | 2014-12-04 | 2016-06-08 | 广东电网有限责任公司电力科学研究院 | A kind of butterfly bus ring for galvanic current transformer checking system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150520 Effective date of abandoning: 20160608 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |