CN112444577B - Method and system for evaluating switching state of vacuum on-load tap-changer - Google Patents
Method and system for evaluating switching state of vacuum on-load tap-changer Download PDFInfo
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- CN112444577B CN112444577B CN202011287458.1A CN202011287458A CN112444577B CN 112444577 B CN112444577 B CN 112444577B CN 202011287458 A CN202011287458 A CN 202011287458A CN 112444577 B CN112444577 B CN 112444577B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/88—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/88—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86
- G01N2030/8809—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86 analysis specially adapted for the sample
- G01N2030/884—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86 analysis specially adapted for the sample organic compounds
- G01N2030/8854—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86 analysis specially adapted for the sample organic compounds involving hydrocarbons
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Abstract
The invention discloses a method and a system for evaluating the switching state of a vacuum on-load tap-changer, wherein the method comprises the following steps: obtaining the total acetylene content S corresponding to the total times of the current oil chromatographic sampling analysistAnd t represents the total number of times of the current oil chromatographic sampling analysis; evaluating the total acetylene content S according to a first preset criteriontWhether or not abnormal, when the total content of acetylene StIf the evaluation result is abnormal, executing the next step; increasing the voltage regulating times of the vacuum on-load tap-changer to preset increasing times to obtain the increased total acetylene content St+k(k is more than or equal to 1), wherein k is expressed as the preset increment times; evaluating the total acetylene content S after the increment according to a second preset criteriont+kAnd whether the current state is abnormal or not, thereby evaluating the switching state of the vacuum on-load tap-changer. The switching state of the vacuum on-load tap-changer can be evaluated through the technical scheme.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a method and a system for evaluating the switching state of a vacuum on-load tap-changer.
Background
The on-load tap changer is a device for regulating output voltage in a transformer, under the condition of transformer excitation or load, the tap ratio of high-voltage and low-voltage windings is changed by switching the tap of the transformer winding so as to regulate the output voltage, and the on-load tap changer plays an important role in the voltage regulation of a power system.
At present, an on-load tap-changer for a power transformer is mainly divided into an oil-immersed on-load tap-changer and a vacuum on-load tap-changer, wherein a change-over switch of the oil-immersed on-load tap-changer is completely immersed in insulating oil, and an electric arc of a main contact is extinguished depending on the insulating property of the oil; although the change-over switch of the vacuum on-load tap-changer is soaked in oil, the vacuum on-load tap-changer uses the closed vacuum bubble to extinguish arc, so that the arc extinguishing performance is good, oil carbonization is not easy to cause, and meanwhile, the vacuum on-load tap-changer has the advantages of small volume and less maintenance, so that the vacuum on-load tap-changer is wide in application and prospect.
At present, the vacuum on-load tap-changer is in an operation-maintenance-free state basically before operation except for oil chromatography detection. However, in recent years, many vacuum on-load tap-changer faults occur in the range of a power grid, mainly because of poor contact caused by abrasion or ablation of switching contacts (including main current-carrying contacts, transition contacts and vacuum arc-extinguishing contacts), and once poor contact of the contacts exists, a small amount of gear shifting operation can overheat the contacts to convert the contacts into arc discharge to cause faults.
Therefore, a method capable of evaluating the switching state of the vacuum on-load tap-changer contact in time is needed at present, so that latent defects of the contact are found and early warning is performed.
Disclosure of Invention
The invention provides a method and a system for evaluating the switching state of a vacuum on-load tap-changer, which are used for solving the technical problem that the switching state of a contact of the vacuum on-load tap-changer cannot be evaluated at present.
In view of the above, the first aspect of the present invention provides a method for evaluating a switching state of a vacuum on-load tap changer, comprising the following steps:
s101: obtaining the total acetylene content S corresponding to the total times of the current oil chromatographic sampling analysistAnd t represents the total number of times of the current oil chromatographic sampling analysis;
s102: evaluating the total acetylene content S according to a first preset criteriontWhether or not abnormal, when the total content of acetylene StIf the evaluation result is abnormal, executing the next step;
s103: increasing the voltage regulating times of the vacuum on-load tap-changer to preset increasing times to obtain the increased total acetylene content St+k(k is more than or equal to 1), wherein k is expressed as the preset increment times;
s104: evaluating the total acetylene content S after the increment according to a second preset criteriont+kAnd whether the current state is abnormal or not, thereby evaluating the switching state of the vacuum on-load tap-changer.
Preferably, the step S101 includes, before: and setting oil chromatographic sampling analysis frequency according to the average voltage regulation frequency in a preset period and the arc extinguishing limit frequency design value of the transition contact of the vacuum on-load tap-changer.
Preferably, the average voltage regulating frequency is defined as N, the arc extinguishing limit frequency design value of the transition contact is defined as N,
when the preset period is 365 days, the setting condition of the oil chromatography sampling analysis frequency specifically comprises the following steps:
when N/365 is less than N, setting the frequency of oil chromatographic sampling analysis to be 1 time per day;
when 2N is more than N/365 is more than or equal to N, setting the sampling and analyzing frequency of the oil chromatogram to be 2 times per day;
when 3N is more than N/365 is more than or equal to 2N, setting the sampling and analyzing frequency of the oil chromatogram to be 3 times per day;
when N/365 is more than or equal to 3N, setting the sampling and analyzing frequency of the oil chromatogram to be 4 times per day.
Preferably, the first preset criterion in step S102 specifically includes:
when the total content of acetylene StIf the absolute content attention value A of acetylene is less than a preset absolute content attention value A, judging that the switching state of the vacuum on-load tap-changer is normal;
when the total content of acetylene StNot less than the preset attention value A of the absolute content of acetylene and the total content S of acetylenet/T<When an acetylene increment reference value B is preset, judging that the switching state of the vacuum on-load tap-changer is normal, wherein T represents the total switching times of the vacuum on-load tap-changer corresponding to the current oil chromatography sampling analysis acquired in advance;
when the total content of acetylene StThe attention value A of the absolute content of the acetylene is preset and the total content S of the acetylene istAnd judging that the switching state of the vacuum on-load tap-changer is abnormal when the/T is larger than or equal to the preset acetylene increment reference value B.
Preferably, the attention value A of the absolute content of the preset acetylene is set to be 10-100 uL/L; the preset acetylene increment reference value B is set to be 0-1 uL/L.
Preferably, the preset increment times in the step S103 are smaller than a design value of arc extinction limit times of a transition contact of the vacuum on-load tap-changer.
Preferably, the step S104 further includes: according to the total content S of acetylenet+kWith total content S of acetylenetCalculated incremental acetylene increment St+k-StThe second preset criterion specifically includes:
when the acetylene is increased by St+k-StWhen the/j is less than a preset acetylene increment attention value C, judging that the switching state of the vacuum on-load tap-changer is normal;
when the acetylene is increased by St+k-StAnd judging that the switching state of the vacuum on-load tap-changer is abnormal when the/j is larger than or equal to the preset acetylene increment attention value C.
Preferably, the preset acetylene increment attention value C is set to be between 5 and 10 uL/L.
Preferably, after the step S104, the method further includes:
and when the switching state of the vacuum on-load tap-changer is evaluated to be abnormal, carrying out power failure check on the vacuum on-load tap-changer.
In another aspect, the present invention further provides a system for evaluating a switching state of a vacuum on-load tap changer, including:
a first obtaining module for obtaining the total acetylene content S corresponding to the total times of the current oil chromatographic sampling analysistAnd t represents the total number of times of the current oil chromatographic sampling analysis;
a first judgment module for evaluating the total acetylene content S according to a first preset criteriontWhether the abnormality is present;
a pressure regulating module for regulating the total content S of acetylenetWhen the voltage is evaluated to be abnormal, increasing the voltage regulating frequency of the vacuum on-load tap-changer to a preset increasing frequency;
a second obtaining module for obtaining the total acetylene content S after the incremental pressure regulation times of the pressure regulating modulet+k(k is more than or equal to 1), wherein k is expressed as the preset increment times;
a second determination module for assessing the increased total acetylene content S according to a second predetermined criteriont+kAnd whether the voltage is abnormal or not, thereby evaluating the switching state of the vacuum on-load tap-changer.
According to the technical scheme, the embodiment of the invention has the following advantages:
the invention provides a method for evaluating the switching state of a vacuum on-load tap-changer, which judges whether the total acetylene content corresponding to the total times of current oil chromatographic sampling analysis is abnormal or not according to a first preset criterion, further judges if the total acetylene content is abnormal, and increments the voltage regulating times of the vacuum on-load tap-changer in the further judgment, so that whether the increased total acetylene content is abnormal or not is evaluated according to a second preset criterion, and the real switching state of the vacuum on-load tap-changer is evaluated according to the acetylene content, so that the potential defects of a contact can be found in time, fault early warning is carried out, meanwhile, the evaluation precision is improved through the evaluation of the increased total acetylene content, and the misjudgment probability is reduced. The beneficial effects of the vacuum on-load tap-changer switching state evaluation system provided by the invention are consistent with those of the vacuum on-load tap-changer switching state evaluation method, and are not repeated herein.
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Fig. 1 is a flowchart of a method for evaluating a switching state of a vacuum on-load tap changer according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for evaluating a switching state of a vacuum on-load tap changer according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a system for evaluating a switching state of a vacuum on-load tap changer according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Because the arc extinguishing of the vacuum on-load tap-changer is carried out in a vacuum bubble isolated from insulating oil, under the normal condition, the oil chromatographic analysis of the insulating oil in the oil chamber of the switch does not detect a large amount of acetylene, if a small amount of acetylene exists, the acetylene is generally generated by slight ignition in the switching process of a transition contact of the switch, therefore, the acetylene content and the switching action frequency of the vacuum on-load tap-changer are in a certain proportional relation, and the real state of the switching of the vacuum on-load tap-changer can be judged according to the acetylene content.
Based on this, referring to fig. 1 for easy understanding, the method for evaluating the switching state of the vacuum on-load tap-changer provided by the present invention comprises the following steps:
s101: obtaining the total acetylene content S corresponding to the total times of the current oil chromatographic sampling analysistAnd t represents the total number of times of current oil chromatographic sampling analysis;
s102: evaluating the total acetylene content S according to a first preset criteriontWhether abnormal or not, when the total content of acetylene StIf the evaluation result is abnormal, executing the next step;
s103: number of voltage regulation for vacuum on-load tap-changerIncreasing to preset increasing times to obtain the increased total content S of acetylenet+k(k is more than or equal to 1), wherein k is expressed as the preset increment times;
s104: evaluating the increased total acetylene content S according to a second preset criteriont+kAnd whether the voltage is abnormal or not is judged, so that the switching state of the vacuum on-load tap-changer is evaluated.
According to the method, whether the total acetylene content corresponding to the total number of times of current oil chromatography sampling analysis is abnormal or not is judged according to a first preset criterion, if yes, the judgment is further carried out, in the further judgment, the number of times of voltage regulation of the vacuum on-load tap-changer is increased, whether the increased total acetylene content is abnormal or not is evaluated according to a second preset criterion, the real switching state of the vacuum on-load tap-changer is evaluated according to the acetylene content, the potential defects of a contact can be found in time, fault early warning is carried out, meanwhile, the evaluation precision is improved through the evaluation of the increased total acetylene content, and the misjudgment probability is reduced.
The above is a detailed description of an embodiment of a method for evaluating a switching state of a vacuum on-load tap-changer provided by the present invention, and the following is a detailed description of another embodiment of the method for evaluating a switching state of a vacuum on-load tap-changer provided by the present invention.
For convenience of understanding, referring to fig. 2, the method for evaluating the switching state of the vacuum on-load tap-changer provided by the present invention includes the following steps:
s201: setting oil chromatographic sampling analysis frequency according to the average voltage regulation frequency in a preset period and the arc extinguishing limit frequency design value of a transition contact of the vacuum on-load tap-changer;
in this embodiment, the average voltage regulation frequency is defined as N, the design value of the arc extinguishing limit frequency of the transition contact is N, and when the preset period is 365 days, the frequency setting condition of the oil chromatography sampling analysis specifically includes:
when N/365 is less than N, setting the sampling and analyzing frequency of the oil chromatogram to be 1 time per day;
when 2N is more than N/365 is more than or equal to N, setting the sampling and analyzing frequency of the oil chromatogram to be 2 times per day;
when 3N is more than N/365 is more than or equal to 2N, setting the sampling and analyzing frequency of the oil chromatogram as 3 times per day;
when N/365 is more than or equal to 3N, setting the sampling and analyzing frequency of the oil chromatogram to be 4 times per day.
In this embodiment, the oil chromatogram sampling analysis frequency is set in units of years (non-leap years), and when the oil chromatogram sampling analysis frequency is 2 to 4 times per day, the sampling times are equal in time interval.
Meanwhile, the average voltage regulation frequency N is also calculated in a preset period, and in a general example, the average voltage regulation frequency N and the arc extinction limit frequency design value N are both determined by the type of the vacuum on-load tap-changer.
S202: obtaining the total acetylene content S corresponding to the total times of the current oil chromatographic sampling analysistAnd t represents the total number of times of current oil chromatographic sampling analysis;
in this embodiment, an oil chromatography sampling analysis is performed by an oil chromatography on-line monitoring device, so as to obtain the total acetylene content. Wherein, the total number of times of the current oil chromatography sampling analysis is the total number of times of the current sampling analysis in a preset period.
S203: evaluating the total acetylene content S according to a first preset criteriontWhether abnormal or not, when the total content of acetylene StIf the evaluation result is abnormal, executing the next step;
specifically, the first preset criterion specifically includes:
when the total content of acetylene StIf the absolute content attention value A of acetylene is less than the preset absolute content attention value A, judging that the switching state of the vacuum on-load tap-changer is normal;
when the total content of acetylene StNot less than the preset attention value A of the absolute content of acetylene and the total content S of acetylenet/T<When an acetylene increment reference value B is preset, judging that the switching state of the vacuum on-load tap-changer is normal, wherein T represents the total switching times of the vacuum on-load tap-changer, which is obtained in advance and corresponds to the current oil chromatography sampling analysis;
when the total content of acetylene StThe attention value A of the absolute content of acetylene and the total content S of acetylene are presettAnd when the/T is larger than or equal to the preset acetylene increment reference value B, judging that the switching state of the vacuum on-load tap-changer is abnormal.
It should be noted that the total number T of times of switching of the vacuum on-load tap-changer may be recorded by a counter provided on an operating mechanism of the vacuum on-load tap-changer.
Meanwhile, the numerical values of a preset acetylene absolute content attention value A and a preset acetylene increment reference value B are determined for different types of vacuum on-load tap changers, and in a general example, the preset acetylene absolute content attention value A is set to be 10-100 uL/L; the preset acetylene increment reference value B is set to be between 0 and 1 uL/L.
S204: increasing the voltage regulating times of the vacuum on-load tap-changer to preset increasing times to obtain the increased total acetylene content St+k(k is more than or equal to 1), wherein k is expressed as the preset increment times;
in this example, S is the total acetylene contenttIn an abnormal situation, the voltage regulation frequency of the vacuum on-load tap-changer needs to be increased, the increment frequency is preset, in a general example, the preset increment frequency is smaller than an arc extinction limit frequency design value of a transition contact of the vacuum on-load tap-changer, so that the fault that arc extinction cannot be carried out when the transition contact after the increment voltage regulation reaches the arc extinction limit is avoided, and more specifically, in order to consider the voltage regulation effect after margin and increment, the voltage regulation operation is stopped after the preset increment frequency reaches 1/2, 2/3 or 3/5 of the arc extinction limit frequency design value of the transition contact of the vacuum on-load tap-changer.
S205: evaluating the increased total acetylene content S according to a second preset criteriont+kWhether the voltage is abnormal or not is judged, so that the switching state of the vacuum on-load tap-changer is evaluated;
in this embodiment, step S205 further includes: according to the total content S of acetylenet+kWith total content S of acetylenetCalculated incremental acetylene increment St+k-StThe second preset criterion specifically includes:
when acetylene is increased by St+k-StWhen the/j is less than a preset acetylene increment attention value C, judging that the switching state of the vacuum on-load tap-changer is normal;
when acetylene is increased by St+k-StThe preset acetylene increment is noticedAnd when the value is C, judging that the switching state of the vacuum on-load tap-changer is abnormal.
It should be noted that the preset acetylene increment attention value C is set according to the type of the vacuum on-load tap-changer, and in a general example, the preset acetylene increment attention value C is set to be between 5 to 10 uL/L.
S206: and when the switching state of the vacuum on-load tap-changer is evaluated to be abnormal, carrying out power failure check on the vacuum on-load tap-changer.
The above is a detailed description of another embodiment of the method for evaluating a switching state of a vacuum on-load tap-changer provided by the present invention, and the following is a detailed description of an embodiment of a system for evaluating a switching state of a vacuum on-load tap-changer provided by the present invention.
For convenience of understanding, referring to fig. 3, the present invention provides a system for evaluating a switching state of a vacuum on-load tap changer, comprising:
a first obtaining module 100, configured to obtain a total acetylene content S corresponding to a total number of times of sampling and analyzing a current oil chromatogramtAnd t represents the total number of times of current oil chromatographic sampling analysis;
a first judging module 200 for evaluating the total acetylene content S according to a first preset criteriontWhether the abnormality is present;
a pressure regulating module 300 for regulating the total content S of acetylenetWhen the evaluation result is abnormal, increasing the voltage regulating frequency of the vacuum on-load tap-changer to a preset increasing frequency;
a second obtaining module 400, configured to obtain the total acetylene content S after the incremental pressure adjustment times performed by the pressure adjusting modulet+k(k is more than or equal to 1), wherein k is expressed as the preset increment times;
a second determination module 500 for assessing the increased total acetylene content S according to a second predetermined criteriont+kAnd whether the voltage is abnormal or not is judged, so that the switching state of the vacuum on-load tap-changer is evaluated.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A switching state evaluation method for a vacuum on-load tap-changer is characterized by comprising the following steps:
s101: obtaining the total acetylene content S corresponding to the total times of the current oil chromatographic sampling analysistAnd t represents the total number of times of the current oil chromatographic sampling analysis;
s102: evaluating the total acetylene content S according to a first preset criteriontWhether or not abnormal, when the total content of acetylene StIf the evaluation result is abnormal, executing the next step;
s103: increasing the voltage regulating times of the vacuum on-load tap-changer to preset increasing times to obtain the increased total acetylene content St+kK is more than or equal to 1, and k is expressed as the preset increment times;
s104: evaluating the total acetylene content S after the increment according to a second preset criteriont+kWhether the load is abnormal or not is judged, so that the switching state of the vacuum on-load tap-changer is evaluated;
the step S104 further includes: according to the total content S of acetylenet+kWith total content S of acetylenetCalculated incremental acetylene increment St+k-StThe second preset criterion specifically includes:
when the acetylene is increased (S)t+k-St) When the/j is less than a preset acetylene increment attention value C, judging that the switching state of the vacuum on-load tap-changer is normal;
when the acetylene is increased (S)t+k-St) And judging that the switching state of the vacuum on-load tap-changer is abnormal when the/j is larger than or equal to the preset acetylene increment attention value C.
2. The vacuum on-load tap changer switching status evaluation method according to claim 1, characterized in that said step S101 is preceded by: and setting oil chromatographic sampling analysis frequency according to the average voltage regulation frequency in a preset period and the arc extinguishing limit frequency design value of the transition contact of the vacuum on-load tap-changer.
3. The vacuum on-load tap-changer switching state evaluation method according to claim 2, characterized in that the average voltage regulation times is defined as N, the arc extinction limit times design value of the transition contact is defined as N,
when the preset period is 365 days, the setting condition of the oil chromatography sampling analysis frequency specifically comprises the following steps:
when N/365 is less than N, setting the frequency of oil chromatographic sampling analysis to be 1 time per day;
when 2N is more than N/365 is more than or equal to N, setting the sampling and analyzing frequency of the oil chromatogram to be 2 times per day;
when 3N is more than N/365 is more than or equal to 2N, setting the sampling and analyzing frequency of the oil chromatogram to be 3 times per day;
when N/365 is more than or equal to 3N, setting the sampling and analyzing frequency of the oil chromatogram to be 4 times per day.
4. The method for evaluating the switching status of the vacuum on-load tap-changer according to claim 1, wherein the first predetermined criterion in the step S102 specifically comprises:
when the total content of acetylene St< attention value A of the absolute content of acetylene preset,judging that the switching state of the vacuum on-load tap-changer is normal;
when the total content of acetylene StNot less than the preset attention value A of the absolute content of acetylene and the total content S of acetylenet/T<When an acetylene increment reference value B is preset, judging that the switching state of the vacuum on-load tap-changer is normal, wherein T represents the total switching times of the vacuum on-load tap-changer corresponding to the current oil chromatography sampling analysis acquired in advance;
when the total content of acetylene StThe attention value A of the absolute content of the acetylene is preset and the total content S of the acetylene istAnd judging that the switching state of the vacuum on-load tap-changer is abnormal when the/T is larger than or equal to the preset acetylene increment reference value B.
5. The vacuum on-load tap-changer switching state evaluation method according to claim 4, wherein the attention value A of the absolute content of acetylene is set to be 10-100 uL/L; the preset acetylene increment reference value B is set to be 0-1 uL/L.
6. The method according to claim 1, wherein the preset increment times in the step S103 are smaller than the designed arc extinguishing limit times of the transition contact of the vacuum on-load tap-changer.
7. The vacuum on-load tap-changer switching state evaluation method according to claim 1, characterized in that the preset acetylene increment attention value C is set to be between 5 and 10 uL/L.
8. The vacuum on-load tap changer switching state evaluation method according to claim 1, further comprising after said step S104:
and when the switching state of the vacuum on-load tap-changer is evaluated to be abnormal, carrying out power failure check on the vacuum on-load tap-changer.
9. A vacuum on-load tap changer switching state evaluation system, comprising:
a first obtaining module for obtaining the total acetylene content S corresponding to the total times of the current oil chromatographic sampling analysistAnd t represents the total number of times of the current oil chromatographic sampling analysis;
a first judgment module for evaluating the total acetylene content S according to a first preset criteriontWhether the abnormality is present;
a pressure regulating module for regulating the total content S of acetylenetWhen the voltage is evaluated to be abnormal, increasing the voltage regulating frequency of the vacuum on-load tap-changer to a preset increasing frequency;
a second obtaining module for obtaining the total acetylene content S after the incremental pressure regulation times of the pressure regulating modulet+kK is more than or equal to 1, and k is expressed as the preset increment times;
a second judgment module, configured to evaluate whether the increased total acetylene content St + k is abnormal according to a second preset criterion, so as to evaluate a switching state of the vacuum on-load tap-changer, and further configured to evaluate the total acetylene content S according tot+kWith total content S of acetylenetCalculated incremental acetylene increment St+k-StThe second preset criterion specifically includes:
when the acetylene is increased (S)t+k-St) When the/j is less than a preset acetylene increment attention value C, judging that the switching state of the vacuum on-load tap-changer is normal;
when the acetylene is increased (S)t+k-St) And judging that the switching state of the vacuum on-load tap-changer is abnormal when the/j is larger than or equal to the preset acetylene increment attention value C.
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