CN114019264A - Comprehensive evaluation method for short-circuit resistance of transformer - Google Patents
Comprehensive evaluation method for short-circuit resistance of transformer Download PDFInfo
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Abstract
The invention provides a comprehensive evaluation method for short-circuit resistance of a transformer, which comprises the following steps: step 1, collecting various parameters influencing the short circuit resistance of the transformer; step 2, establishing an analysis platform based on a mathematical model, and importing standard data; step 3, comparing the detection data with the standard data; step 4, obtaining required data by inquiring and merging transformer delivery parameter data under each operation unit, step 5, calculating the short circuit resisting capacity, step 6, making preliminary judgment according to the result obtained by calculation in the step 5, step 7, taking the calculated short circuit current limit value as observation data through state evaluation, step 8, determining whether to give out an early warning by field personnel according to the evaluation state and the actual operation condition of the transformer, step 9, and entering an early warning processing flow. The traditional planned maintenance mode of the power grid equipment is changed into a more scientific stateful maintenance mode, the stability of safe operation of the power grid equipment is improved, and the loss caused by accidents is reduced.
Description
Technical Field
The application relates to the technical field of transformer detection, in particular to a comprehensive evaluation method for short-circuit resistance of a transformer.
Background
When a transformer is suddenly short-circuited, a large short-circuit force is generated in the winding, so that the short-circuit resistance of the transformer is particularly important. If the design or the technological measures of the transformer are imperfect, the short-circuit resistance is not enough, the insulation and the structural part of the winding are damaged if the transformer is light, the insulation performance of the transformer is influenced, and the winding is loosened, twisted, deformed and broken or turn-to-turn short circuit is caused by insulation damage if the transformer is heavy. In the operation process of a system, if short circuit damage occurs to a large-scale power transformer, large-area power failure can be caused, the maintenance period of the large-scale power transformer is more than half a year, and the loss is large. The statistical analysis of the accidents of the power transformers with 110kV and above voltage levels in China in recent years shows that the accidents caused by insufficient short-circuit resistance are the primary cause of the transformer accidents, and the safe and reliable operation of the transformers is seriously influenced. In the evaluation of the short-circuit capability of the transformer, the short-circuit damage is a main cause of transformer accidents, and in order to reduce the loss caused by the short-circuit damage of the transformer, the occurrence of the fault needs to be prevented and reduced, and the short-circuit resistance of the transformer in operation needs to be comprehensively evaluated.
Disclosure of Invention
In order to solve the above technical problem, the embodiments of the present specification are implemented as follows:
the method for comprehensively evaluating the short-circuit resistance of the transformer provided by the embodiment of the specification comprises the following steps:
establishing a mathematical model according to parameters influencing the short-circuit resistance of the transformer and the relationship among the parameters;
establishing an analysis platform based on a mathematical model, and importing standard data in the analysis platform, wherein the standard data comprises: transformer delivery parameters and transformer operating parameters;
acquiring detection data of a transformer to be detected, and judging whether the detection data is consistent with the standard data;
if the detection data do not accord with the standard data, calculating short-circuit resistance data of the transformer to be detected;
judging whether the state of the transformer to be tested is abnormal or not based on the short-circuit resistance data;
and if the state of the transformer to be detected is abnormal, evaluating the abnormal state of the transformer to be detected, and judging whether early warning is needed or not based on an evaluation result.
Optionally, a mathematical model is established according to the parameters affecting the short-circuit resistance of the transformer and the relationship between the parameters, and specifically includes:
the method includes the steps of collecting various parameters influencing the short circuit resistance of the transformer, summarizing data of the short circuit resistance of the transformer according to characteristic state quantity when the transformer is impacted by short circuit, sorting the relation among the data, and establishing a mathematical model.
Optionally, the transformer factory parameters include: the method comprises the following steps of running parameters of the transformer, the name of the substation, the voltage grade of the substation, a running number, the voltage grade, whether the transformer is in operation or not, the rated capacity, the winding type, the type of the transformer, the connection mode, whether the autotransformer exists or not, the voltage grade, the factory voltage grade of the transformer and the short-circuit current limit value.
Optionally, the transformer operation parameters include an operation unit, a name of a substation, an operation number, a neutral point grounding mode, a bus number, a parallel bus number, a single-phase short-circuit current, a three-phase short-circuit current, and a resistance value of a current-limiting reactor.
Optionally, calculating the short-circuit resistance data of the transformer to be tested specifically includes:
obtaining required data by inquiring transformer delivery parameter data, transformer operation parameter data, transformer bus renumbering and bus number combination under each operation unit;
and calculating the short-circuit current limit value of the transformer to be tested according to the required data.
Optionally, the short-circuit current limit of the transformer to be tested is calculated by the following formula:
I＝(100/Ukt％+Uks％)*In；
wherein, I represents the short-circuit current limit value of the transformer to be tested, Ukt percent represents the short-circuit impedance percentage of the transformer, and In is the rated current of the winding; uks represents the percentage of system short circuit impedance.
Optionally, Uks ═ 100% (transformer capacity/(short circuit current ×. system rated voltage) × (nominal system voltage)).
Optionally, if the data in one side of the transformer to be tested is larger than the data in any side when the transformer leaves the factory, the transformer to be tested is judged to be abnormal.
Optionally, the evaluating the abnormal state of the transformer to be tested specifically includes:
determining the high-voltage and low-voltage values of the three-phase short-circuit winding current of the high-voltage side, the medium-voltage side and the low-voltage side of the transformer to be detected and the high-voltage and low-voltage values of the single-phase winding current, calculating to obtain a short-circuit current limit value, and taking the calculated short-circuit current limit value as observation data;
and judging whether the short-circuit current limit value provided by the manufacturer is larger than the observation data.
Optionally, judging whether to need early warning based on the evaluation result specifically includes:
and when the short-circuit current limit value provided by the manufacturer is larger than the observation data, entering an early warning processing flow and providing treatment measures.
The embodiment of the specification adopts at least one technical scheme which can achieve the following beneficial effects:
the invention collects, summarizes, arranges and researches parameters influencing the short circuit resistance of the transformer by the influence factors possibly suffering from short circuit impact to the transformer, establishes a system taking the short circuit resistance accounting, the evaluation and the treatment of the transformer as the core, formulates a standard operation method of the accounting, the evaluation and the treatment by the real-time access to the data of the transformer factory parameters, the transformer operation parameters and the like, converts the traditional scheduled maintenance mode of the power grid equipment into a more scientific state maintenance mode, and converts the traditional scheduled maintenance mode of the power grid equipment into the more scientific, more stable and more stable power grid equipment operation by analyzing, arranging and researching the data of the transformer factory parameters, the transformer operation parameters and the like. The invention can strengthen the fault handling capacity, reduce the complexity of department cooperation, improve the working efficiency, continuously optimize the treatment measures, improve the evaluation treatment mode and have better popularization and application values.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic flow chart of a method for comprehensively evaluating short-circuit resistance of a transformer according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, 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 application.
The existing comprehensive evaluation method for the short-circuit resistance of the transformer has the following defects: firstly, most of evaluation methods are based on analysis and research of self characteristics of materials, structures and the like of the transformer, and research on connection modes and use environments is lacked; secondly, as for the result after calculation and check, a few defense decision methods are adopted, and the difference between theoretical research and actual research is large.
The invention provides a comprehensive evaluation method for short-circuit resistance of a transformer, which comprises the following steps: step 1, collecting various parameters influencing the short circuit resistance of the transformer; step 2, establishing an analysis platform based on a mathematical model, and importing standard data; step 3, comparing the detection data with the standard data; step 4, obtaining required data by inquiring and merging transformer delivery parameter data under each operation unit, step 5, calculating the short circuit resisting capacity, step 6, making preliminary judgment according to the result obtained by calculation in the step 5, step 7, taking the calculated short circuit current limit value as observation data through state evaluation, step 8, determining whether to give out an early warning by field personnel according to the evaluation state and the actual operation condition of the transformer, step 9, and entering an early warning processing flow. The traditional planned maintenance mode of the power grid equipment is changed into a more scientific stateful maintenance mode, the stability of safe operation of the power grid equipment is improved, and the loss caused by accidents is reduced.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a method for comprehensively evaluating short-circuit resistance of a transformer according to an embodiment of the present disclosure. From the viewpoint of a program, the execution subject of the flow may be a program installed in an application server or an application client.
As shown in fig. 1, the process may include the following steps:
step 110: establishing a mathematical model according to parameters influencing the short-circuit resistance of the transformer and the relationship among the parameters;
step 120: establishing an analysis platform based on a mathematical model, and importing standard data in the analysis platform, wherein the standard data comprises: transformer delivery parameters and transformer operating parameters;
step 130: acquiring detection data of a transformer to be detected, and judging whether the detection data is consistent with the standard data;
step 140: if the detection data do not accord with the standard data, calculating short-circuit resistance data of the transformer to be detected;
step 150: judging whether the state of the transformer to be tested is abnormal or not based on the short-circuit resistance data;
step 160: and if the state of the transformer to be detected is abnormal, evaluating the abnormal state of the transformer to be detected, and judging whether early warning is needed or not based on an evaluation result.
Optionally, establishing a mathematical model according to the parameters affecting the short-circuit resistance of the transformer and the relationship between the parameters may specifically include:
the method includes the steps of collecting various parameters influencing the short circuit resistance of the transformer, summarizing data of the short circuit resistance of the transformer according to characteristic state quantity when the transformer is impacted by short circuit, sorting the relation among the data, and establishing a mathematical model.
Optionally, the transformer factory parameters may include: the method comprises the following steps of running parameters of the transformer, the name of the substation, the voltage grade of the substation, a running number, the voltage grade, whether the transformer is in operation or not, the rated capacity, the winding type, the type of the transformer, the connection mode, whether the autotransformer exists or not, the voltage grade, the factory voltage grade of the transformer and the short-circuit current limit value.
Optionally, the transformer operation parameters may include an operation unit, a name of a substation, an operation number, a neutral point grounding manner, a bus number, a parallel bus number, a single-phase short-circuit current, a three-phase short-circuit current, and a resistance value of a current-limiting reactor.
Optionally, calculating the short-circuit resistance data of the transformer to be tested may specifically include:
obtaining required data by inquiring transformer delivery parameter data, transformer operation parameter data, transformer bus renumbering and bus number combination under each operation unit;
and calculating the short-circuit current limit value of the transformer to be tested according to the required data.
Optionally, the short-circuit current limit of the transformer to be tested may be calculated by the following formula:
I＝(100/Ukt％+Uks％)*In；
wherein, I represents the short-circuit current limit value of the transformer to be tested, Ukt percent represents the short-circuit impedance percentage of the transformer, and In is the rated current of the winding; uks represents the percentage of system short circuit impedance.
Optionally, Uks ═ 100% (transformer capacity/(short circuit current ×. system rated voltage) × (nominal system voltage)).
Optionally, if the data in one side of the transformer to be tested is larger than the data in any side when the transformer leaves the factory, the transformer to be tested is judged to be abnormal.
Optionally, the evaluating the abnormal state of the transformer to be tested may specifically include:
determining the high-voltage and low-voltage values of the three-phase short-circuit winding current of the high-voltage side, the medium-voltage side and the low-voltage side of the transformer to be detected and the high-voltage and low-voltage values of the single-phase winding current, calculating to obtain a short-circuit current limit value, and taking the calculated short-circuit current limit value as observation data;
and judging whether the short-circuit current limit value provided by the manufacturer is larger than the observation data.
Optionally, judging whether to need early warning based on the evaluation result specifically includes:
and when the short-circuit current limit value provided by the manufacturer is larger than the observation data, entering an early warning processing flow and providing treatment measures.
Based on the method of fig. 1, the embodiments of the present specification also provide some specific implementations of the method, which are described below.
Example one
The embodiment provides a comprehensive evaluation method for short-circuit resistance of a transformer, which comprises the following steps:
step 1: collecting various parameters influencing the short circuit resistance of the transformer, inducing data of the short circuit resistance of the transformer according to the characteristic state quantity when the transformer is impacted by the short circuit, and sorting the relation among the data to establish a mathematical model according to the data;
step 2: establishing an analysis platform based on a mathematical model, and importing standard data, wherein the standard data comprises: transformer parameter and transformer operation parameter of dispatching from the factory, transformer parameter of dispatching from the factory includes: the method comprises the following steps of (1) running parameters of a transformer, the name of a substation, the voltage grade of the substation, a running number, the voltage grade, whether the transformer is in operation or not, the rated capacity, the winding type, the type of the transformer, the connection mode, whether an autotransformer exists or not, the voltage grade, the factory voltage grade of the transformer and the short-circuit current limit value;
the transformer operation parameters comprise an operation unit, a transformer substation name, an operation number, a neutral point grounding mode, a bus number, a parallel bus number, single-phase short-circuit current, three-phase short-circuit current and resistance of a current-limiting reactor;
step 3; comparing the detected data with the standard data to see if there is a change in the data, proceeding to step 4 if there is a change, if there is no change, checking if there is a new fault record, if not, proceeding to step 4, if not, repeating the data comparison
And 4, step 4: obtaining required data by inquiring transformer delivery parameter data, transformer operation parameter data, transformer bus renumbering and bus number combination under each operation unit;
and 5: calculating the short circuit resistance;
step 6: performing preliminary judgment according to the result obtained by the calculation in the step 5, judging that the transformer is abnormal if the data on one side of the transformer is larger than the data on any side of the transformer when leaving the factory, marking the transformer with a red font, and returning to the step 2 if the transformer is not normal; if abnormal, entering step 7;
and 7: and determining the high-voltage and low-voltage values of the three-phase short-circuit winding current at the high-voltage side, the medium-voltage side and the low-voltage side and the high-voltage and low-voltage values of the single-phase winding current through state evaluation, establishing a corresponding relation with the short-circuit current limit value provided by a manufacturer by taking the calculated short-circuit current limit value as observation data, and giving an early warning if the short-circuit current limit value is larger than an actual value in a result. (ii) a
And 8: according to the evaluation state and the actual operation condition of the transformer, field personnel determine whether to send out early warning, if necessary, the step 9 is carried out, and if not, the process is ended;
and step 9: and entering an early warning processing flow, and entering a processing program after the measure flow is finished.
In the scheme, the influence of single or multiple short circuit impacts on the reliability of the equipment is modeled and calculated according to the test data and the historical accumulated data, and the current short circuit current bearable capacity of the transformer is calculated by combining the limit value provided by a manufacturer.
In a preferred scheme, in the step 5, the calculation of the short-circuit resistance mainly includes calculating a limit value of the short-circuit current of the transformer, and calculating a calculation formula of the short-circuit current of the transformer according to the symmetrical current of the double-winding three-phase transformer:
in the formula, the symmetrical short-circuit current I is:
l is the short-circuit current of the transformer; zs is the impedance of the high-voltage system, Zt is the impedance of the transformer, k is the coefficient for calculating the initial offset of the test current, and the coefficient takes the ratio of the sine wave peak value to the square root value into consideration
Related to X/R, wherein;
x is the sum of the reactance of the transformer and the system reactance; r is the sum of the transformer resistance and the system resistance (Rt + Rs), and is represented by Q, wherein Rt is the resistance at the reference temperature;
deducing a transformer short-circuit current limit value formula according to the formula:
I＝(100/Ukt％+Uks％)*In；
in the formula, Ukt% is a short-circuit resistance value, and In is a rated current of the winding;
wherein Uks is obtained as (transformer capacity/(short-circuit current + system rated voltage) × nominal system voltage) × 100%, I is finally the transformer short-circuit current limit.
In the scheme, the magnitude of the short-circuit current which can be borne by the transformer is calculated, so that impedance and other transformer parameter data are calculated by using bus current, the short-circuit current capability of the transformer under different conditions is obtained according to the value, and the treatment measures under different conditions are analyzed.
It should also be noted that 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 an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A comprehensive assessment method for short-circuit resistance of a transformer is characterized by comprising the following steps:
establishing a mathematical model according to parameters influencing the short-circuit resistance of the transformer and the relationship among the parameters;
establishing an analysis platform based on a mathematical model, and importing standard data in the analysis platform, wherein the standard data comprises: transformer delivery parameters and transformer operating parameters;
acquiring detection data of a transformer to be detected, and judging whether the detection data is consistent with the standard data;
if the detection data do not accord with the standard data, calculating short-circuit resistance data of the transformer to be detected;
judging whether the state of the transformer to be tested is abnormal or not based on the short-circuit resistance data;
and if the state of the transformer to be detected is abnormal, evaluating the abnormal state of the transformer to be detected, and judging whether early warning is needed or not based on an evaluation result.
2. The method according to claim 1, wherein the establishing a mathematical model based on parameters affecting the short circuit resistance of the transformer and the relationship between the parameters comprises:
the method includes the steps of collecting various parameters influencing the short circuit resistance of the transformer, summarizing data of the short circuit resistance of the transformer according to characteristic state quantity when the transformer is impacted by short circuit, sorting the relation among the data, and establishing a mathematical model.
3. The method of claim 1, wherein the transformer factory parameters comprise: the method comprises the following steps of running parameters of the transformer, the name of the substation, the voltage grade of the substation, a running number, the voltage grade, whether the transformer is in operation or not, the rated capacity, the winding type, the type of the transformer, the connection mode, whether the autotransformer exists or not, the voltage grade, the factory voltage grade of the transformer and the short-circuit current limit value.
4. The method of claim 1, wherein the transformer operating parameters include operating units, substation names, operating numbers, neutral grounding patterns, bus numbers, parallel bus numbers, single phase short circuit current, three phase short circuit current, and current limiting reactor resistance.
5. The method of claim 1, wherein calculating the short circuit capability resistance data of the transformer under test specifically comprises:
obtaining required data by inquiring transformer delivery parameter data, transformer operation parameter data, transformer bus renumbering and bus number combination under each operation unit;
and calculating the short-circuit current limit value of the transformer to be tested according to the required data.
6. The method of claim 5, wherein the short circuit current limit of the transformer under test is calculated by the following equation:
I＝(100/Ukt％+Uks％)*In；
wherein, I represents the short-circuit current limit value of the transformer to be tested, Ukt percent represents the short-circuit impedance percentage of the transformer, and In is the rated current of the winding; uks represents the percentage of system short circuit impedance.
7. The method of claim 6, wherein Uks ═ 100% (transformer capacity/(short circuit current) system rated voltage) nominal system voltage).
8. The method according to claim 1, wherein the abnormality is determined if data in one side of the transformer under test is larger than data in any side at the time of factory shipment.
9. The method of claim 1, wherein the evaluating the abnormal state of the transformer to be tested specifically comprises:
determining the high-voltage and low-voltage values of the three-phase short-circuit winding current of the high-voltage side, the medium-voltage side and the low-voltage side of the transformer to be detected and the high-voltage and low-voltage values of the single-phase winding current, calculating to obtain a short-circuit current limit value, and taking the calculated short-circuit current limit value as observation data;
and judging whether the short-circuit current limit value provided by the manufacturer is larger than the observation data.
10. The method of claim 9, wherein determining whether an early warning is needed based on the evaluation result specifically comprises:
and when the short-circuit current limit value provided by the manufacturer is larger than the observation data, entering an early warning processing flow and providing treatment measures.
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Cited By (1)
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| CN116626417A (en) * | 2023-05-17 | 2023-08-22 | 三科调压电源(深圳)有限公司 | System and method for testing short-circuit resistance of voltage-regulating rectifier transformer |
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