Dirty external insulation configuration method and system for dry-type reactor

Abstract

The invention discloses a pollution external insulation configuration method and system for a dry-type reactor, and the method comprises the steps: obtaining the meteorological characteristics of a station site of a converter station, and determining the pollution grade based on the meteorological characteristics; obtaining a dry-type reactor test object, and selecting a condition that the false encapsulation surface on the dry-type reactor test object is in a weak hydrophobic state as a test condition; carrying out a false encapsulation artificial pollution test on the dry-type reactor sample based on the pollution grade and the test condition, and obtaining a first voltage; based on the first voltage, performing an arcing characteristic test on a false package of the dry-type reactor test object, and determining a target voltage meeting a leakage current requirement; and based on the target voltage, carrying out configuration of dirty external insulation. By means of the method, the filth external insulation parameters of the dry-type reactor can be economically and reasonably given out, the equipment cost can be reduced, safe and stable operation of the dry-type reactor is facilitated, and the operation cost can be greatly saved.

Description

Technical Field

[0001] The present invention relates to the technical field of insulation configuration of power equipment, and more specifically, to a method and system for configuring the contaminated external insulation of a dry-type reactor. Background Art

[0002] The dry-type air-core reactor has the characteristics of simple insulation structure and convenient operation and maintenance, and has no risk of combustion and explosion. It is one of the oil-free alternatives for ultra-high voltage shunt reactors. The ultra-high voltage dry-type air-core shunt reactor has a high terminal voltage and a large capacity. It is in a high electric temperature and high voltage state for a long time. The requirements for the insulation layer to withstand electrical stress and external insulation characteristics are increased. There are significant differences in material characteristics and applicability, design methods and key processes, testing and assessment technologies, etc. compared with conventional low-voltage products.

[0003] For the dry-type reactor, its outer surface is smooth without edges, and its interior is composed of multiple layers of windings. Its structure is quite different from that of porcelain / composite post / casing structures. Due to the special structure of the dry-type reactor, if the design margin of the contaminated external insulation is insufficient, through-surface flashover and local surface discharge under contaminated and wet conditions will occur, resulting in the phenomenon of leakage tracking, which will seriously threaten the safe and stable operation of the reactor. As a key device in the converter station, the pollution accumulation on the outer surface / air duct of the dry-type reactor will also increase in a heavily polluted environment. How to determine a reasonable creepage distance ratio has become an important issue in the development of dry-type reactors. Therefore, special attention must be paid to the design of the contaminated external insulation of the dry-type reactor, appropriately increasing its insulation size, and at the same time taking rain and pollution prevention measures and measures to suppress the surface leakage current density to prevent flashover and local surface discharge.

[0004] Currently, for station equipment such as posts and bushings, the contaminated insulation is configured based on the 50% pollution withstand level of the equipment, and partial discharge may still occur during operation. The external insulation of the dry-type reactor is made of epoxy resin material, and its arc erosion resistance is poor. Long-term arcs will cause erosion of the outer surface of the dry-type reactor, seriously threatening the safe operation of the dry-type reactor. Currently, there is no reasonable design method for the contaminated external insulation of dry-type reactors, mainly manifested in: (1) There is no reasonable method for the configuration method of the contaminated external insulation of dry-type reactors; (2) Design units and manufacturers have no reference basis for the external structure dimensions of dry-type reactors, and usually design according to the production limit of the manufacturer or past experience; (3) The design parameter margin of the external insulation of dry-type reactors is too large.

[0005] Therefore, aiming at the problem that there is a lack of corresponding methods for the configuration of the contaminated external insulation of dry-type reactors, it is urgent to study a method for configuring the contaminated external insulation of dry-type reactors to make up for the problem that there is no reasonable method for the configuration of the contaminated external insulation of dry-type reactors. Summary of the Invention

[0006] The present invention provides a method and system for configuring the polluted external insulation of a dry-type reactor to solve the problem that there is no reasonable method for configuring the polluted external insulation of a dry-type reactor.

[0007] To solve the above problems, according to one aspect of the present invention, a method for configuring the polluted external insulation of a dry-type reactor is provided. The method includes:

[0008] Obtaining the meteorological characteristics at the site of the converter station and determining the pollution level based on the meteorological characteristics;

[0009] Obtaining a dry-type reactor test sample and selecting the surface of the false enclosure on the dry-type reactor test sample with a weakly hydrophobic state as the test condition;

[0010] Carrying out an artificial pollution test on the false enclosure of the dry-type reactor test sample based on the pollution level and test conditions, and obtaining the first voltage U 50 ;

[0011] Based on the first voltage U 50 Conducting an arc initiation characteristic test on the false enclosure of the dry-type reactor test sample to determine the target voltage that meets the leakage current requirement;

[0012] Configuring the polluted external insulation based on the target voltage.

[0013] Preferably, the weakly hydrophobic state is HC5 to HC6 level.

[0014] Preferably, the false enclosure is an epoxy cylinder, and the false enclosure is installed at the outer enclosure of the dry-type reactor.

[0015] Preferably, the conducting an arc initiation characteristic test on the false enclosure of the dry-type reactor test sample based on the first voltage U 50 to determine the target voltage that meets the leakage current requirement includes:

[0016] Taking the first voltage U 50 as a reference to conduct an arc initiation characteristic test on the false enclosure of the dry-type reactor test sample, and reducing the applied voltage at a preset interval to obtain the change trend of the leakage current until the leakage current is continuously lower than the preset current threshold for a preset time, and determining the voltage applied at this time as the target voltage that meets the leakage current requirement.

[0017] Preferably, the preset current threshold is 60 mA.

[0018] According to another aspect of the present invention, a system for configuring the polluted external insulation of a dry-type reactor is provided. The system includes:

[0019] A pollution level determination unit for obtaining the meteorological characteristics at the site of the converter station and determining the pollution level based on the meteorological characteristics;

[0020] A test condition determination unit, configured to obtain a dry-type reactor test sample and select the surface of a false enclosure on the dry-type reactor test sample with a weakly hydrophobic state as the test condition;

[0021] A first voltage acquisition unit, configured to perform an artificial contamination test on the false enclosure of the dry-type reactor test sample based on the contamination level and the test condition, and acquire a first voltage U 50 ;

[0022] A target voltage determination unit, configured to perform an arc initiation characteristic test on the false enclosure of the dry-type reactor test sample based on the first voltage U 50 and determine a target voltage that meets the leakage current requirement;

[0023] A configuration unit, configured to perform configuration of the contaminated external insulation based on the target voltage.

[0024] Preferably, the weakly hydrophobic state is HC5 - HC6 level.

[0025] Preferably, the false enclosure is an epoxy cylinder, and the false enclosure is installed at the outer enclosure of the dry-type reactor.

[0026] Preferably, the target voltage determination unit performs an arc initiation characteristic test on the false enclosure of the dry-type reactor test sample based on the first voltage U 50 and determines a target voltage that meets the leakage current requirement, including:

[0027] Performing an arc initiation characteristic test on the false enclosure of the dry-type reactor test sample with the first voltage U 50 as a reference, reducing the applied voltage at a preset interval, acquiring the change trend of the leakage current, and determining the voltage applied at this time as the target voltage that meets the leakage current requirement until the leakage current is continuously lower than a preset current threshold for a preset time.

[0028] Preferably, the preset current threshold is 60 mA.

[0029] The present invention provides a method and system for configuring the polluted external insulation of a dry-type reactor, including: obtaining the meteorological characteristics at the location of the converter station, and determining the pollution level based on the meteorological characteristics; obtaining a test sample of the dry-type reactor, and selecting the surface of the false enclosure on the test sample of the dry-type reactor to be in a weakly hydrophobic state as the test condition; conducting an artificial pollution test on the false enclosure of the test sample of the dry-type reactor based on the pollution level and the test condition, and obtaining a first voltage; conducting an arc initiation characteristic test on the false enclosure of the test sample of the dry-type reactor based on the first voltage to determine the target voltage that meets the leakage current requirement; and configuring the polluted external insulation based on the target voltage. The present invention can solve the problem that there is currently a lack of a reasonable method for configuring the polluted external insulation of dry-type reactors. Through the method of the present invention, the polluted external insulation parameters of dry-type reactors can be given economically and reasonably, which is not only beneficial to reducing equipment costs, but also beneficial to the safe and stable operation of dry-type reactors, and can greatly save operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The exemplary embodiments of the present invention can be more fully understood by reference to the following drawings:

[0031] Figure 1 FIG. 100 is a flowchart of a method for configuring the polluted external insulation of a dry-type reactor according to an embodiment of the present invention;

[0032] Figure 2 FIG. 101 is a typical trend chart of the change in leakage current according to an embodiment of the present invention;

[0033] Figure 3 FIG. 300 is a schematic structural diagram of a system for configuring the polluted external insulation of a dry-type reactor according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] Now, exemplary embodiments of the present invention will be described with reference to the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely, and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings are not intended to limit the present invention. In the drawings, the same unit / element is denoted by the same reference numeral.

[0035] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the ordinary meaning understood by those skilled in the art. In addition, it can be understood that the terms defined in the commonly used dictionary should be understood to have a meaning consistent with the context of the relevant field, and should not be understood as idealized or overly formal meanings.

[0036] The object of the present invention is to solve the problems that the external insulation design of current dry-type reactors lacks basis and the product design margin is too large. Through the method and device of the present invention, the pollution external insulation design of dry-type reactors can be based on evidence, the external insulation design is reasonable, and the project cost can be greatly reduced.

[0037] Figure 1 FIG. is a flowchart of a method 100 for configuring the pollution external insulation of a dry-type reactor according to an embodiment of the present invention. As Figure 1 shown, the method for configuring the pollution external insulation of a dry-type reactor provided by the embodiment of the present invention can solve the problem that the current configuration of the pollution external insulation of dry-type reactors lacks a reasonable method. Through the method of the present invention, the pollution external insulation parameters of dry-type reactors can be given economically and reasonably, which is beneficial to reducing the equipment cost, and is also beneficial to the safe and stable operation of dry-type reactors, and can greatly save the operation cost. The method 100 for configuring the pollution external insulation of a dry-type reactor provided by the embodiment of the present invention starts from step 101. In step 101, the meteorological characteristics at the converter station site are obtained, and the pollution level is determined based on the meteorological characteristics.

[0038] In step 102, a dry-type reactor test sample is obtained, and the surface of the false enclosure on the dry-type reactor test sample is selected as the test condition with a weakly hydrophobic state.

[0039] Preferably, the weakly hydrophobic state is HC5-HC6 level.

[0040] Preferably, the false enclosure is an epoxy cylinder, and the false enclosure is installed at the outer enclosure of the dry-type reactor.

[0041] In step 103, an artificial pollution test on the false enclosure of the dry-type reactor test sample is carried out based on the pollution level and the test conditions, and a first voltage U 50 .

[0042] In step 104, an arc initiation characteristic test is carried out on the false enclosure of the dry-type reactor test sample based on the first voltage U 50 to determine the target voltage that meets the leakage current requirement.

[0043] Preferably, the arc initiation characteristic test is carried out on the false enclosure of the dry-type reactor test sample based on the first voltage U 50 to determine the target voltage that meets the leakage current requirement, including:

[0044] Taking the first voltage U 50 as a reference to carry out the arc initiation characteristic test of the false enclosure of the dry-type reactor test sample, and reducing the applied voltage at a preset interval to obtain the change trend of the leakage current. When the leakage current is continuously lower than the preset current threshold for a preset time, the voltage applied at this time is determined as the target voltage that meets the leakage current requirement.

[0045] Preferably, the preset current threshold is 60 mA.

[0046] In step 105, the external insulation against pollution is configured based on the target voltage.

[0047] In the present invention, the pollution withstand voltage characteristics of the outermost enclosure of the dry-type reactor are used as the basis for configuration.

[0048] The operating environment of the dry-type reactor is harsh. Usually, an epoxy cylinder is installed as a false enclosure at its outermost enclosure to protect the reactor enclosure from external climate erosion and for sound insulation. As the outermost false enclosure, both its upper and lower ends are connected to the electrodes, and the voltage it withstands is close to that of other enclosures of the dry-type reactor. Since it is the outermost enclosure, its surface is easily affected by the external environment, and the accumulation of dirt and moisture is relatively serious, and its surface flashover voltage is the lowest. Therefore, it is reasonable to select the pollution withstand voltage characteristics of the outermost false enclosure of the dry-type reactor as the basis for its external insulation configuration.

[0049] In the present invention, the pollution withstand voltage characteristics of the outermost surface of the dry-type reactor in a weakly hydrophobic state are used as the basis for configuration.

[0050] Currently, RTV coatings are usually sprayed on the outermost enclosure of dry-type reactors. Compared with those without RTV coatings, their surfaces have good hydrophobicity and hydrophobic migration properties, so their anti-fouling flashover performance is better. Hydrophobicity means that silicone rubber materials have a low surface tension, and the water adsorbed on their surfaces after being wetted exists in the form of discontinuous isolated small water droplets and does not form a continuous water film; hydrophobic migration means that after the silicone rubber surface is soiled, the organic small molecules in the silicone rubber will diffuse to the surface of the soiled layer, so that the latter also obtains certain hydrophobic properties; in a humid environment, the existence of hydrophobicity on the surface of the soiled layer can significantly inhibit the development of the surface leakage current and thus increase the flashover voltage of the insulator. According to the experience of measuring the hydrophobicity of composite insulators after years of operation, it is very rare for the surface hydrophobic performance of composite insulators to reach HC5 ～ HC6. The performance of the false enclosure of the dry-type reactor sprayed with RTV coatings has certain similarities with that of composite insulators. Therefore, the present invention selects the pollution withstand voltage characteristics of the outermost surface of the dry-type reactor in a weakly hydrophobic state (HC5-HC6 level) as the basis for configuration, and conducts artificial pollution tests on the false enclosure of the dry-type reactor in this state to obtain its U 50 .

[0051] In the present invention, the arcing characteristics and leakage current state of the outermost enclosure of the dry-type reactor are the basis for checking the configuration method.

[0052] After obtaining the flashover voltage U50 of the false enclosure of the dry-type reactor through the artificial pollution test on which the present invention is based, an arcing characteristic test of the outermost false enclosure of the dry-type reactor is carried out on this basis as a verification basis. During the test, the voltage applied across the outermost false enclosure is gradually reduced to observe the changing trend of the surface leakage current. Until the voltage is reduced to a value where the surface leakage current continuously remains below 60 mA, then this voltage value can be considered to meet the configuration requirements. A typical changing trend of the leakage current is as Figure 2 shown.

[0053] A newly built ultra / extra-high voltage project converter station needs to equip a batch of dry-type reactors for the system. This converter station is located in a Class D polluted area. In order to obtain reasonable size parameters of the dry-type reactor, the design unit and the manufacturer need to carry out the structural design of the dry-type reactor based on the pollution withstand characteristics of the dry-type reactor. The design unit first proposes preliminary design parameters of the dry-type reactor according to the project requirements. The manufacturer then produces samples according to the preliminary design dimensions to carry out the pollution withstand characteristic test of the dry-type reactor, obtains preliminary test results, and then conducts an arcing characteristic test on the test sample, monitors the changing trend of the surface leakage current of the dry-type reactor during the test, verifies the test results based on the changing trend of the leakage current, and finally determines the final structural dimensions of the dry-type reactor based on the verification results. The dimensions of the dry-type reactor determined through this process can not only greatly reduce the size of the equipment, but also ensure the stable operation of the system.

[0054] Figure 3 FIG. is a schematic structural diagram of a pollution external insulation configuration system 300 for a dry-type reactor according to an embodiment of the present invention. As Figure 3 shown, the pollution external insulation configuration system 300 for a dry-type reactor provided by the embodiment of the present invention includes: a pollution level determination unit 301, a test condition determination unit 302, a first voltage acquisition unit 303, a target voltage determination unit 304, and a configuration unit 305.

[0055] Preferably, the pollution level determination unit 301 is configured to obtain the meteorological characteristics at the converter station site and determine the pollution level based on the meteorological characteristics.

[0056] Preferably, the test condition determination unit 302 is configured to obtain a test sample of the dry-type reactor and select the surface of the false enclosure on the test sample of the dry-type reactor to be in a weakly hydrophobic state as the test condition.

[0057] Preferably, the weakly hydrophobic state is HC5 to HC6 level.

[0058] Preferably, the false enclosure is an epoxy cylinder, and the false enclosure is installed at the outer enclosure of the dry-type reactor.

[0059] Preferably, the first voltage acquisition unit 303 is configured to perform a false encapsulation artificial contamination test on the dry-type reactor test sample based on the contamination level and test conditions, and acquire a first voltage U 50 .

[0060] Preferably, the target voltage determination unit 304 is configured to perform an arc initiation characteristic test on the false encapsulation of the dry-type reactor test sample based on the first voltage U 50 and determine a target voltage that meets the leakage current requirement.

[0061] Preferably, the target voltage determination unit 304 performs an arc initiation characteristic test on the false encapsulation of the dry-type reactor test sample based on the first voltage U 50 and determine a target voltage that meets the leakage current requirement, including:

[0062] Based on the first voltage U 50 perform an arc initiation characteristic test on the false encapsulation of the dry-type reactor test sample, and reduce the applied voltage at a preset interval to obtain the change trend of the leakage current. When the leakage current remains lower than the preset current threshold for a preset time, determine the voltage applied at this time as the target voltage that meets the leakage current requirement.

[0063] Preferably, the preset current threshold is 60 mA.

[0064] Preferably, the configuration unit 305 is configured to configure the contaminated external insulation based on the target voltage.

[0065] The contaminated external insulation configuration system 300 of the dry-type reactor in the embodiment of the present invention corresponds to the contaminated external insulation configuration method 100 of the dry-type reactor in another embodiment of the present invention, and will not be elaborated here.

[0066] The present invention has been described by referring to a few embodiments. However, as is well known to those skilled in the art, other embodiments equivalent to those disclosed above of the present invention equally fall within the scope of the present invention.

[0067] Generally, all terms used in the present invention are interpreted according to their ordinary meanings in the technical field, unless otherwise clearly defined therein. All references to "a / the [device, component, etc.]" are to be interpreted openly as at least one instance of the device, component, etc., unless otherwise clearly stated. The steps of any method disclosed here do not necessarily have to be run in the exact order disclosed, unless clearly stated.

[0068] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) that contain computer-usable program code.

[0069] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one or more of the flows Figure 1 or blocks or combinations of blocks.

[0070] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in Figure 1 one or more of the flows Figure 1 or blocks or combinations of blocks.

[0071] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one or more of the flows Figure 1 or blocks or combinations of blocks.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the specific implementation manners of the present invention can still be modified or equivalently replaced, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the protection scope of the present invention.

Claims

1. A method for configuring dirty external insulation of a dry-type reactor, characterized in that: The method comprises: Obtaining meteorological characteristics at a converter station site, and determining a pollution level based on the meteorological characteristics; A dry-type reactor sample is obtained, and a test condition is selected in which a pseudo-encapsulation surface on the dry-type reactor sample is in a weakly hydrophobic state; Based on the pollution level and test conditions, a false encapsulation artificial pollution test is carried out on the dry-type reactor test product, and a first voltage U is obtained. 50 ; Based on the first voltage U 50 Performing an arcing characteristic test on the pseudo-encapsulation of the dry-type reactor test piece to determine a target voltage that meets the leakage current requirement; Configuration of the contaminated external insulation is performed based on the target voltage.

2. The method according to claim 1, characterized in that The weak hydrophobic state is HC5 to HC6 level.

3. The method according to claim 1, characterized in that The dummy encapsulation is an epoxy cylinder, and the dummy encapsulation is installed on the outer encapsulation of the dry-type reactor.

4. The method according to claim 1, characterized in that: The performing an arcing characteristic test on the pseudo-encapsulation of the dry-type reactor test product based on the first voltage to determine a target voltage that meets the leakage current requirement includes: A pseudo-encapsulation arcing characteristic test of the dry-type inductor test piece is carried out based on the first voltage, and the applied voltage is reduced at preset intervals to obtain the leakage current change trend until the leakage current is lower than the preset current threshold for a preset time, and the voltage applied at this time is determined to be the target voltage that meets the leakage current requirements.

5. The method according to claim 4, characterized in that The preset current threshold is 60mA.

6. A dirty external insulation configuration system for dry-type reactors, characterized in that: The system comprises: a pollution level determination unit, configured to obtain meteorological characteristics at a converter station site and determine a pollution level based on the meteorological characteristics; A test condition determination unit, used for obtaining a dry-type reactor test sample, and selecting a test condition in which a pseudo-encapsulation surface on the dry-type reactor test sample is in a weakly hydrophobic state; The first voltage acquisition unit is used to carry out a false encapsulation artificial pollution test on the dry-type reactor test product based on the pollution level and test conditions, and obtain a first voltage U 50 ; A target voltage determination unit is configured to determine a target voltage based on the first voltage U 50 Performing an arcing characteristic test on the pseudo-encapsulation of the dry-type reactor test piece to determine a target voltage that meets the leakage current requirement; A configuration unit is used to configure the dirty external insulation based on the target voltage.

7. The system according to claim 6, characterized in that The weak hydrophobic state is HC5 to HC6 level.

8. The system according to claim 6, characterized in that The dummy encapsulation is an epoxy cylinder, and the dummy encapsulation is installed on the outer encapsulation of the dry-type reactor.

9. The system according to claim 6, characterized in that The target voltage determination unit is based on the first voltage U 50 An arcing characteristic test is performed on the pseudo-encapsulation of the dry-type reactor test product to determine a target voltage that meets the leakage current requirement, including: With the first voltage U 50 The pseudo-encapsulation arcing characteristic test of the dry-type reactor test piece is carried out as a benchmark, and the applied voltage is reduced at preset intervals to obtain the leakage current change trend. When the leakage current is lower than the preset current threshold for a preset time, it is determined that the applied voltage at this time is the target voltage that meets the leakage current requirements.

10. The system according to claim 9, characterized in that The preset current threshold is 60mA.

Images