CN219456301U - High-precision and environment-friendly flexible direct voltage divider - Google Patents
High-precision and environment-friendly flexible direct voltage divider Download PDFInfo
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- CN219456301U CN219456301U CN202320641207.1U CN202320641207U CN219456301U CN 219456301 U CN219456301 U CN 219456301U CN 202320641207 U CN202320641207 U CN 202320641207U CN 219456301 U CN219456301 U CN 219456301U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The utility model discloses a high-precision and environment-friendly flexible direct voltage divider, which comprises: the primary voltage divider is fully sealed and comprises a multistage resistor and capacitor parallel unit, the multistage resistor and capacitor parallel unit are connected in series, the resistor is used for sensing alternating current and direct current voltage, and the capacitor is used for equalizing voltage and guaranteeing frequency characteristics; and the remote module box is electrically connected with the primary voltage divider, comprises a low-voltage division plate and a remote module, wherein the low-voltage division plate is electrically connected with the primary voltage divider, and the remote module is electrically connected with the low-voltage division plate, receives and processes the voltage signal output by the primary voltage divider, converts the voltage signal into a digital signal through A/D, and outputs a serial digital optical signal. The flexible direct voltage divider effectively improves the measurement accuracy by optimizing the impedance configuration; meanwhile, the advanced environment-friendly gas is used as an insulating medium, so that the development concept of double carbon is met.
Description
Technical Field
The present utility model relates to the field of voltage dividers, and more particularly to a high precision, environmentally friendly flexible direct voltage divider.
Background
Conventional ac/dc voltage dividers can be divided into 3 types according to different principles: capacitive voltage divider, resistive-capacitive voltage divider. The whole device consists of a voltage divider and a measuring instrument. Sulfur hexafluoride (SF 6) gas is filled in the voltage divider to serve as an insulating medium.
In an AC/DC field intensity network in a flexible DC area, the traditional voltage divider has the problems of low measurement accuracy, large stray capacitance, poor harmonic resistance and the like. In addition, sulfur hexafluoride (SF 6) as a fluorine-containing greenhouse gas causes greenhouse gas emissions with a Global Warming Potential (GWP) of 23500, i.e., 1 ton of sulfur hexafluoride corresponds to 23500 tons of carbon dioxide, has a surprising carbon emission and can remain in the atmosphere for thousands of years, and the long-term use of this gas is detrimental to energy green conversion and sustainable development.
Thus, there is a lack of a high precision, environmentally friendly flexible direct voltage divider in the art.
Disclosure of Invention
The utility model aims to provide a flexible direct voltage divider with high precision and environmental friendliness. The flexible direct voltage divider effectively improves the measurement accuracy by optimizing the impedance configuration; meanwhile, the advanced environment-friendly gas is used as an insulating medium, so that the development concept of double carbon is met.
The present utility model provides a high precision, environmentally friendly, flexible direct voltage divider comprising: the primary voltage divider is fully sealed and comprises a multistage resistor and capacitor parallel unit, wherein the multistage resistor and capacitor parallel unit is connected in series, the resistor is used for sensing alternating current and direct current voltage, and the capacitor is used for equalizing voltage and guaranteeing frequency characteristics; the remote module box is electrically connected with the primary voltage divider, and comprises a low-voltage dividing plate and a remote module, wherein the low-voltage dividing plate is electrically connected with the primary voltage divider, the remote module is electrically connected with the low-voltage dividing plate, and the remote module receives and processes the voltage signal output by the primary voltage divider, converts the voltage signal into a digital signal through A/D, and outputs a serial digital optical signal.
In another preferred example, the inside of the primary voltage divider is filled with insulating gas Blue without greenhouse effect.
In another preferred embodiment, a equalizing ring is mounted on top of the primary voltage divider to equalize the voltage.
In a further preferred embodiment, the low-voltage divider plate is provided with a protective discharge gap for securing the low-voltage circuit elements.
In another preferred embodiment, the primary voltage divider is externally insulated by a hollow composite insulator.
In another preferred embodiment, the hollow composite insulator is a silicone rubber composite jacket.
In another preferred embodiment, the hollow composite insulator of the flexible direct voltage divider is integrally cast and formed without an intermediate flange.
In another preferred embodiment, the low voltage dividing plate comprises a plurality of low voltage dividing units connected in parallel, and each low voltage dividing unit comprises a two-stage resistor and capacitor parallel unit connected in series.
In another preferred embodiment, the soft direct voltage divider further comprises a secondary system part comprising a combining unit, the combining unit being in signal connection with the remote module.
In another preferred embodiment, the merging unit is in signal connection with the remote module through a multi-core optical cable, and the merging unit receives and processes data issued by the remote module through the multi-core optical cable.
In another preferred embodiment, the flexible direct voltage divider further comprises an intelligent monitoring system, and the intelligent monitoring system receives the processing result of the merging unit and monitors the running state of the equipment in real time.
In another preferred embodiment, the remote module and the merging unit both adopt independent power supply modes, so that the measurement precision of each module can be effectively ensured.
It is understood that within the scope of the present utility model, the above-described technical features of the present utility model and technical features specifically described below (e.g., in the examples) may be combined with each other to constitute new or preferred technical solutions. And are limited to a space, and are not described in detail herein.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a high precision, environmentally friendly flexible direct voltage divider in one example of the utility model.
In the drawings, each is indicated as follows:
1-a voltage divider section;
2-a primary voltage divider;
3-a remote module box;
4-a low-pressure split plate;
a 5-remote module;
6-a secondary system part;
7-multicore optical cable;
8-merging unit.
Detailed Description
Through extensive and intensive research, the inventor develops a high-precision and environment-friendly flexible direct voltage divider for the first time through a large number of screening, and the flexible direct voltage divider adopts high-precision resistors with small temperature coefficients, capacitors integrally rolled by advanced equipment and the like to realize precise control on capacitance and resistance values of the equipment, so that the advantages of high overall measurement precision, remarkable anti-harmonic effect and the like of the equipment are realized; meanwhile, the insulating gas with zero carbon emission is adopted, so that the method has the characteristics of environmental protection; the present utility model has been completed on the basis of this finding.
Terminology
As used herein, the term "soft dc voltage divider" refers to a metering device used to measure power frequency ac high voltage and dc high voltage, as applied in the field of power system and electrical and electronic device manufacturing.
As used herein, the term "sulfur hexafluoride (SF 6) gas" is a stable inert gas that is colorless, odorless, low-toxic, nonflammable at normal temperature and pressure, generally used as an arc extinguishing medium, is not easily decomposed, and can cause a greenhouse effect by long-term accumulation, and has a choking effect on a human body at a high concentration.
As used herein, the term "zero carbon environmental gas" refers to a gas that is stable in performance, low in liquefaction temperature, zero carbon without fluorine, and does not produce a greenhouse effect.
The utility model provides a high-precision and environment-friendly flexible direct voltage divider, which is a flexible direct voltage divider with a specific structure.
The soft direct voltage divider of the utility model is generally arranged in a VSC converter valve side start loop region of a converter station for measuring ac/dc voltage in an electric power system. The flexible direct-current voltage divider adopts a resistance-capacitance voltage divider structure, is a fully-sealed flexible direct-current voltage divider, and mainly comprises a primary voltage divider, a low-voltage part, a remote module, a merging unit and an intelligent monitoring system.
The remote module box is arranged on the equipment body of the flexible direct voltage divider, and the merging unit and the intelligent monitoring system are arranged in the control room.
The primary voltage divider is formed by serially connecting a multistage resistor and a capacitor parallel unit. The precise resistor voltage divider senses the AC/DC voltage, and the capacitor voltage divider is utilized to equalize and ensure the frequency characteristic. The external insulation adopts a hollow composite insulator, insulating gas without greenhouse effect is filled in the hollow composite insulator, the hollow composite insulator has the characteristics of green and environment protection, and the equalizing ring is arranged at the top of the hollow composite insulator to equalize the voltage.
The high-voltage arm selects a high-quality resistor with a small temperature coefficient and a vacuum dipping capacitor, so that impedance matching is optimized; the low-voltage arm is provided with a discharge protection gap, so that the safety of the low-voltage loop element is ensured, and the accuracy of measuring the AC/DC voltage and the harmonic voltage in the soft DC system is improved.
The precise resistor voltage divider senses the AC/DC voltage, and the capacitor voltage divider is utilized to equalize and ensure the frequency characteristic. The external insulation is integrally cast and formed by adopting a hollow composite insulator, and no intermediate flange is contained.
Insulating gas without greenhouse effect is filled in the voltage divider, the voltage divider has the characteristics of environmental protection, and the equalizing ring is arranged at the top of the voltage divider to equalize voltage.
The voltage divider adopts a resistor element with high precision and low temperature coefficient as a main material, and can effectively ensure the stability of the resistance value under the action of high voltage.
The silicon rubber composite jacket is adopted for the external insulation of the primary voltage divider, and the composite jacket has the advantages of flame retardance, fire resistance, explosion resistance, good mechanical property, high anti-seismic level and the like, does not generate splash after breakdown, and can reduce the loss probability.
The design principle of the low-voltage part is similar to that of the high-voltage part, and the low-voltage part is provided with a protective discharge gap to ensure the safety of elements of the low-voltage loop, and the output voltage of the voltage divider is used as the input voltage signal of the remote module.
The remote module receives and processes the signal output by the primary sensor, and outputs a serial digital optical signal after A/D conversion.
The merging unit receives and processes the data issued by the remote module through the optical cable, and outputs digital quantity to the background intelligent monitoring system according to a specified transmission protocol, and the intelligent monitoring system monitors the running state of the equipment in real time.
The remote module and the merging unit are independently powered, so that the measurement precision of each module can be effectively ensured.
The insulator part of the flexible straight voltage divider is not provided with an intermediate flange, so that the structure is stable and reliable, and the installation and maintenance are convenient. The merging unit is used for collecting the operation parameters of the equipment in real time and monitoring the internal air pressure change, so that the purposes of omnibearing protection and measurement are realized.
The main technical parameters of the flexible-straight voltage divider are shown in the following table 1:
table 1: main technical parameters of flexible-straight voltage divider
The main advantages of the utility model include:
(1) The high-precision low-temperature-coefficient resistor element is adopted as a main material, so that the stability of the resistance of the equipment under the action of high voltage can be effectively ensured, and the high-precision high-frequency-bandwidth high-voltage-response-resistance-coefficient resistor element has the characteristics of high measurement precision, high frequency bandwidth, good transient response characteristic and the like;
(2) The internal and external capacitors and resistors are reasonably arranged, the distribution field intensity is uniform, the harmonic resistance is high, and the method is suitable for an AC/DC network in a converter station;
(3) The external insulation is formed by integrally casting a hollow composite insulator, and has the characteristics of high mechanical strength, good shock resistance, strong pollution flashover resistance, aging resistance, no maintenance and the like;
(4) The fluorine-free carbon-free environment-friendly gas (Blue) is used as an internal insulating medium, is nontoxic, fluorine-free and nonflammable, does not need to be recycled, does not need a ventilation system, has good economical efficiency in the whole life cycle, really realizes zero carbon, zero fluorine, zero toxicity and zero gas maintenance cost, and leads the power industry to be transformed to the green.
The utility model will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present utility model and are not intended to limit the scope of the present utility model. Furthermore, the drawings are schematic representations, and thus the apparatus and device of the present utility model are not limited by the dimensions or proportions of the schematic representations.
It should be noted that in the claims and the description of this patent, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Examples
The high precision, environmentally friendly flexible direct voltage divider of this embodiment is shown in fig. 1. The soft straight voltage divider comprises a voltage divider part 1 and a secondary system part 6. Wherein the voltage divider section 1 comprises a primary voltage divider 2 and a remote module box 3; the secondary system section 6 includes a multi-core optical cable 7 and a merging unit 8. The voltage divider part 1 is mainly used for voltage measurement and analog-to-digital conversion; the secondary system part 6 is mainly used for secondary transmission and data acquisition processing.
The primary voltage divider 2 is fully sealed and comprises a multistage resistor and capacitor parallel unit, the multistage resistor and capacitor parallel unit are connected in series, the resistor is used for sensing alternating current and direct current voltage, and the capacitor is used for equalizing voltage and guaranteeing frequency characteristics. In fig. 1, the first resistor and capacitor parallel unit is a resistor R13 and a capacitor C11, the second resistor and capacitor parallel unit is a resistor R24 and a capacitor C22, and the first resistor and capacitor parallel unit and the second resistor and capacitor parallel unit are connected in series.
The external insulation of the primary voltage divider 2 adopts a silicon rubber composite jacket as a hollow composite insulator, and the hollow composite insulator is integrally cast and formed without an intermediate flange, so that the hollow composite insulator has the advantages of flame retardance, fire resistance, explosion resistance, good mechanical property, high anti-seismic level and the like, does not generate splashes during breakdown, and can reduce the loss probability. The inside of the primary voltage divider 2 is filled with insulating gas Blue without greenhouse effect. The equalizing ring is arranged at the top of the primary voltage divider 2 to equalize the voltage.
The remote module box 3 is electrically connected to the primary voltage divider 2, more specifically, the remote module box 3 is connected in parallel with a second resistive and capacitive parallel unit. The remote module box 3 comprises a low voltage divider plate 4 and a remote module 5, wherein the low voltage divider plate 4 is electrically connected with the primary voltage divider 2, and the remote module 5 is electrically connected with the low voltage divider plate 4. The remote module 5 receives and processes the voltage signal output by the primary voltage divider 2, and outputs a serial digital optical signal through a/D conversion to a digital signal.
The low voltage dividing plate 4 includes a plurality of low voltage dividing units connected in parallel, each of which includes a two-stage resistor and capacitor parallel unit connected in series. As shown in fig. 1, each low voltage dividing unit includes a third resistor and capacitor parallel unit and a fourth resistor and capacitor parallel unit connected in series. In the third resistor and capacitor parallel unit, a resistor R33 and a capacitor C31 are connected in parallel; in the fourth resistor-capacitor parallel unit, the resistor R34 and the capacitor C32 are connected in parallel. Each low voltage divider unit is electrically connected to a remote module 5. The low-voltage dividing plate 4 is provided with a protective discharge gap for ensuring the safety of low-voltage loop elements and improving the accuracy of measuring alternating-current and direct-current voltages and harmonic voltages in a flexible direct-current system.
The merging unit 8 is in signal connection with the remote module 5 through the multi-core optical cable 7, and the merging unit 8 receives and processes data issued by the remote module 5 through the multi-core optical cable 7.
The flexible direct voltage divider also comprises an intelligent monitoring system, and the intelligent monitoring system receives the processing result of the merging unit 8 and monitors the running state of the equipment in real time.
The remote module 5 and the merging unit 8 adopt independent power supply modes, so that the measurement precision of each module can be effectively ensured.
The embodiment selects the high-quality resistor with low temperature coefficient and the vacuum impregnation capacitor, can effectively ensure the stability of the resistance under the action of high voltage, and optimizes the impedance matching. The temperature coefficient of the resistor is not more than 15 ppm/DEG C; preferably, no more than 10 ppm/. Degree.C. The precise resistor voltage divider senses the AC/DC voltage, and the capacitor voltage divider is utilized to equalize and ensure the frequency characteristic.
The advantages of this embodiment are:
(1) The stability, the measurement precision and the harmonic resistance of the voltage divider are improved, and the voltage divider is applicable to a complex electromagnetic environment in a soft and straight starting area;
(2) The process materials are optimized, so that the voltage divider has the characteristics of high reliability, wide application, strong shock resistance, good corrosion resistance, high direct current breakdown strength and the like;
(3) The fluorine-free and carbon-free environment-friendly gas is used as an insulating medium, so that the emission of greenhouse gases is stopped.
All documents mentioned in this application are incorporated by reference as if each were individually incorporated by reference. Further, it will be appreciated that various changes and modifications may be made by those skilled in the art after reading the above teachings, and such equivalents are intended to fall within the scope of the claims appended hereto.
Claims (10)
1. A high precision, environmentally friendly flexible direct voltage divider, the flexible direct voltage divider comprising:
the primary voltage divider is fully sealed and comprises a multistage resistor and capacitor parallel unit, wherein the multistage resistor and capacitor parallel unit is connected in series, the resistor is used for sensing alternating current and direct current voltage, and the capacitor is used for equalizing voltage and guaranteeing frequency characteristics; and
the remote module box is electrically connected with the primary voltage divider, and comprises a low-voltage dividing plate and a remote module, wherein the low-voltage dividing plate is electrically connected with the primary voltage divider, the remote module is electrically connected with the low-voltage dividing plate, and the remote module receives and processes the voltage signal output by the primary voltage divider, converts the voltage signal into a digital signal through A/D, and outputs a serial digital optical signal.
2. The flexible direct voltage divider of claim 1, wherein the interior of the primary voltage divider is filled with a greenhouse effect free insulating gas Blue.
3. The flexible direct voltage divider of claim 1, wherein a voltage equalizing ring is mounted on top of the primary voltage divider to equalize voltage.
4. The flexible direct voltage divider of claim 1, wherein the low voltage divider plate is provided with a protective discharge gap for securing low voltage circuit components.
5. The flexible direct voltage divider of claim 1, wherein the primary voltage divider is externally insulated with a hollow composite insulator.
6. The flexible direct voltage divider of claim 5, wherein the hollow composite insulator of the flexible direct voltage divider is integrally cast without an intermediate flange.
7. The flexible direct voltage divider of claim 1, wherein the low voltage divider plate comprises a plurality of low voltage divider units connected in parallel, each of the low voltage divider units comprising a series connected two-stage resistor and capacitor parallel unit.
8. The flexible direct voltage divider of claim 1, further comprising a secondary system portion comprising a combining unit in signal connection with the remote module.
9. The flexible direct voltage divider of claim 8, wherein the merging unit is in signal connection with the remote module through a multi-core optical cable, and the merging unit receives and processes data issued by the remote module through the multi-core optical cable.
10. The flexible direct voltage divider of claim 8, further comprising an intelligent monitoring system that receives the processing results of the merging unit and monitors the device operating state in real time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320641207.1U CN219456301U (en) | 2023-03-28 | 2023-03-28 | High-precision and environment-friendly flexible direct voltage divider |
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| CN202320641207.1U CN219456301U (en) | 2023-03-28 | 2023-03-28 | High-precision and environment-friendly flexible direct voltage divider |
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| CN219456301U true CN219456301U (en) | 2023-08-01 |
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