CN201984100U - Direct current electronic voltage transformer - Google Patents
Direct current electronic voltage transformer Download PDFInfo
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- CN201984100U CN201984100U CN2011200522094U CN201120052209U CN201984100U CN 201984100 U CN201984100 U CN 201984100U CN 2011200522094 U CN2011200522094 U CN 2011200522094U CN 201120052209 U CN201120052209 U CN 201120052209U CN 201984100 U CN201984100 U CN 201984100U
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- voltage transformer
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Abstract
The utility model discloses a direct current electronic voltage transformer, comprising a primary voltage divider, a lower voltage dividing plate, a plurality of remote module and a plurality of combination units; an output end of the primary voltage divider is connected with an input end of the lower voltage dividing plate; the lower voltage dividing plate comprises a plurality of in parallel connected resistance-capacitance voltage dividing loops; the number of the remote module and the combination unit is same as it of the resistance-capacitance voltage dividing loops; an input end of the remote module is correspondingly connected with an output end of each resistance-capacitance voltage dividing loop; and an output end of the remote module is correspondingly connected with an input end of the combination unit. The sampling signals of a plurality of remote modules in the voltage transformer are mutually independent, and are not affected each other. The utility model solves the problem that a plurality of remote modules in the current structure is in parallel connected with the same signal end to mutually affect the sampling signal in the remote module, and improves reliability of the direct current electronic voltage transformer.
Description
Technical field
The utility model relates to a kind of DC electronic voltage transformer (VT), relate in particular to a kind of outfit and have the DC electronic voltage transformer (VT) that a plurality of independent low pressure of dividing hydraulic circuits are divided pressing plate, it is very little to make this low pressure of connection divide the sampled signal of a plurality of remote end modules of pressing plate to influence, and improves the reliability of total system.
Background technology
HVDC (High Voltage Direct Current) transmission system is rapidly developed in China in recent years, and the DC control protection system needs DC voltage transformer that true and reliable primary voltage information is provided.The application of DC electronic voltage transformer (VT) in straight-flow system of Sampling techniques is more and more on the spot based on divider and remote end module.
Fig. 1 shows the structure of existing DC electronic voltage transformer (VT), comprise that mainly voltage divider 10, a low pressure divides pressing plate 20, remote end module 30, transmission cable 40 and merge cells 50, wherein, the input end of a voltage divider 10 connects dc high voltage V1 to be measured, carries out output LOW voltage V2 after the dividing potential drop; The output terminal of a described voltage divider 10 connects the input end that low pressure is divided pressing plate 20, low-voltage V2 is carried out second divided voltage, output voltage signal V3; Remote end module 30 is provided with n (n is a natural number) altogether, its input end all and receive the output terminal that low pressure is divided pressing plate 20, in-site collecting low pressure is divided the output signal V3 of pressing plate 20, and is converted into digital optical signal, sends merge cells 50 in the pulpit to by transmission cable 40.
In the DC electronic voltage transformer (VT), usually need (general 4 ~ 6 of a plurality of remote end modules of configuration, more sometimes), a plurality of remote end modules in the existing structure are connected to the same output terminal that low pressure is divided pressing plate simultaneously, as shown in Figure 1, like this, when a remote end module breaks down when causing its input impedance to diminish, the input signal that can cause other remote end module fluctuates, cause the equal input error voltage signal of all secondary devices that uses this voltage transformer (VT), can cause the protection malfunction when serious; What is more; if fault remote end module input end short circuit; this moment, the input signal of other all normal remote end modules was zero, and the line voltage signal of all control protective device inputs that voltage transformer (VT) is relevant is zero therewith, thereby influences the normal use of voltage transformer (VT).
The utility model content
Technical problem to be solved in the utility model, be at defective in the aforementioned background art and deficiency, a kind of DC electronic voltage transformer (VT) is provided, the sampled signal of a plurality of remote end modules wherein is relatively independent, be independent of each other, a plurality of remote end modules are connected to the interactional problem of remote end module sampled signal that same signal end causes in the solution existing structure, improve the application reliability of DC electronic voltage transformer (VT).
The utility model is for solving the problems of the technologies described above, and the technical scheme that is adopted is:
A kind of DC electronic voltage transformer (VT), comprise that voltage divider, a low pressure divides pressing plate, a plurality of remote end module and a plurality of merge cells, the output terminal of a voltage divider connects the input end that low pressure is divided pressing plate, described low pressure divides pressing plate to comprise that capacitance-resistance a plurality of and that connect divides hydraulic circuit, and the number of remote end module and merge cells divides the number of hydraulic circuit identical with capacitance-resistance, the input end of described remote end module and each capacitance-resistance divide the output terminal of hydraulic circuit to connect one to one, and the input end of the output terminal of remote end module and merge cells connects one to one.
Above-mentioned low pressure divides pressing plate to be made up of a plurality of capacitance-resistance dividing potential drop loops connected with each other, and each capacitance-resistance divides the high-voltage arm of hydraulic circuit to have identical time constant with low-voltage arm.Low pressure divides the input resistance of pressing plate and input capacitance to equate with the high-voltage arm capacity-resistance time constant of a voltage divider with the equivalent capacity-resistance time constant of a voltage divider low-voltage arm formation, can make the DC electronic voltage transformer (VT) have good frequency characteristic like this.
After adopting said structure, the utility model divides pressing plate to be designed to capacitance-resistance a plurality of and that connect low pressure and divides hydraulic circuit, thereby have a plurality of independently output signals, and with remote end module of each output signal connection, thereby make that the sampled signal of a plurality of remote end modules is relatively independent, be independent of each other, thereby solved a plurality of remote end modules of DC electronic voltage transformer (VT) and be connected to the interactional problem of remote end module sampled signal that same signal end causes, improved the application reliability of DC electronic voltage transformer (VT).
Description of drawings
Fig. 1 is the principle schematic of existing DC electronic voltage transformer (VT);
Fig. 2 is the principle schematic of the utility model DC electronic voltage transformer (VT).
Among the figure: 1. voltage divider, 2. low pressure is divided pressing plate, 3. remote end module, 4. optical cable, 5. merge cells.
Embodiment
Below with reference to accompanying drawing syndeton of the present utility model and beneficial effect are elaborated.
As shown in Figure 2, the utility model provides a kind of DC electronic voltage transformer (VT), comprise that voltage divider 1, a low pressure divides pressing plate 2, a plurality of remote end module 3, optical cable 4 and a plurality of merge cells 5, this paper is that example is introduced with 500kV DC electronic voltage transformer (VT).
One time voltage divider 1 is made of two capacitance-resistance loops that are connected in series mutually, and each capacitance-resistance loop includes resistance connected with each other and electric capacity, wherein, the resistance of high-voltage arm is 24.995M Ω, the electric capacity of high-voltage arm is 100pF, and the resistance of low-voltage arm is 100k Ω, and the electric capacity of low-voltage arm is 50nF.
Low pressure divides pressing plate 2 to comprise that a plurality of capacitance-resistances connected with each other divide hydraulic circuit, be provided with 6 in the present embodiment, be packaged in the stainless steel shielding box body, wherein, each loop high-voltage arm resistance 570k Ω, high-voltage arm electric capacity 31.5pF, low-voltage arm equivalent resistance 30k Ω, low-voltage arm equivalent capacity 600pF, and each capacitance-resistance divides hydraulic circuit mesohigh arm capacity-resistance time constant to equate with low-voltage arm equivalence capacity-resistance time constant, in addition, low pressure divides the input resistance of pressing plate and input capacitance to equate with the high-voltage arm capacity-resistance time constant of a voltage divider with the equivalent capacity-resistance time constant of a voltage divider low-voltage arm formation, thus the feasible good frequency characteristic that the utlity model has.
The number of remote end module 3 and low pressure divide in the pressing plate 2 capacitance-resistance to divide the number of hydraulic circuit identical, also be 6, and each remote end module 3 connect the output terminal that each capacitance-resistance is divided hydraulic circuit by concentric cable respectively.
The number of merge cells 5 is identical with the number of remote end module 3, also is 6, and each merge cells 5 connects one to one by optical cable 4 and remote end module 3.
After adopting the structure of present embodiment, by theoretical analysis as can be known, the variation of a remote end module input resistance does not have influence substantially to normal remote end module input signal, fault remote end module input short circuit is 0.48% to the influence of normal remote end module measuring voltage, and fault remote end module input pull-down is 0.12% to the influence of normal remote end module measuring voltage.
Claims (2)
1. DC electronic voltage transformer (VT) comprises that a voltage divider, a low pressure divides pressing plate, a plurality of remote end module and a plurality of merge cells, and the output terminal of a voltage divider connects the input end that low pressure is divided pressing plate; It is characterized in that: described low pressure divides pressing plate to comprise that capacitance-resistance a plurality of and that connect divides hydraulic circuit, and the number of remote end module and merge cells divides the number of hydraulic circuit identical with capacitance-resistance, the input end of described remote end module and each capacitance-resistance divide the output terminal of hydraulic circuit to connect one to one, and the input end of the output terminal of remote end module and merge cells connects one to one.
2. DC electronic voltage transformer (VT) as claimed in claim 1 is characterized in that: described low pressure divides in the pressing plate each capacitance-resistance to divide hydraulic circuit high-voltage arm capacity-resistance time constant and low-voltage arm equivalence capacity-resistance time constant to equate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200522094U CN201984100U (en) | 2011-03-02 | 2011-03-02 | Direct current electronic voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200522094U CN201984100U (en) | 2011-03-02 | 2011-03-02 | Direct current electronic voltage transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201984100U true CN201984100U (en) | 2011-09-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200522094U Expired - Lifetime CN201984100U (en) | 2011-03-02 | 2011-03-02 | Direct current electronic voltage transformer |
Country Status (1)
| Country | Link |
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| CN (1) | CN201984100U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103296692A (en) * | 2013-06-21 | 2013-09-11 | 国家电网公司 | Control device and method for putting converter station into flexible direct current power transmission system |
| CN105548661A (en) * | 2016-02-02 | 2016-05-04 | 中国南方电网有限责任公司超高压输电公司 | Method for monitoring extra high voltage DC power transmission system DC line voltage fluctuation |
| CN106501568A (en) * | 2016-12-23 | 2017-03-15 | 中国西电电气股份有限公司 | A kind of divider remote end module casing |
| CN111896224A (en) * | 2020-08-14 | 2020-11-06 | 南方电网科学研究院有限责任公司 | A laser power supply circuit performance detection device, method and terminal equipment |
| CN113702894A (en) * | 2021-09-23 | 2021-11-26 | 云南电网有限责任公司电力科学研究院 | Fault diagnosis method and device for remote module and merging unit |
| CN118642031A (en) * | 2024-08-13 | 2024-09-13 | 常州博瑞电力自动化设备有限公司 | A method, system, electronic device and storage medium for adjusting RC time constant of DC voltage divider |
-
2011
- 2011-03-02 CN CN2011200522094U patent/CN201984100U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103296692A (en) * | 2013-06-21 | 2013-09-11 | 国家电网公司 | Control device and method for putting converter station into flexible direct current power transmission system |
| CN105548661A (en) * | 2016-02-02 | 2016-05-04 | 中国南方电网有限责任公司超高压输电公司 | Method for monitoring extra high voltage DC power transmission system DC line voltage fluctuation |
| CN105548661B (en) * | 2016-02-02 | 2019-02-26 | 中国南方电网有限责任公司超高压输电公司 | A kind of monitoring method of extra-high voltage DC transmission system DC line voltage distribution fluctuation |
| CN106501568A (en) * | 2016-12-23 | 2017-03-15 | 中国西电电气股份有限公司 | A kind of divider remote end module casing |
| CN106501568B (en) * | 2016-12-23 | 2020-04-24 | 中国西电电气股份有限公司 | Far-end module box body for direct-current voltage divider |
| CN111896224A (en) * | 2020-08-14 | 2020-11-06 | 南方电网科学研究院有限责任公司 | A laser power supply circuit performance detection device, method and terminal equipment |
| CN111896224B (en) * | 2020-08-14 | 2022-04-12 | 南方电网科学研究院有限责任公司 | Laser power supply loop performance detection device and method and terminal equipment |
| CN113702894A (en) * | 2021-09-23 | 2021-11-26 | 云南电网有限责任公司电力科学研究院 | Fault diagnosis method and device for remote module and merging unit |
| CN118642031A (en) * | 2024-08-13 | 2024-09-13 | 常州博瑞电力自动化设备有限公司 | A method, system, electronic device and storage medium for adjusting RC time constant of DC voltage divider |
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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: 20110921 |