CN111722152A - Transformer winding deformation monitoring method and monitoring system - Google Patents
Transformer winding deformation monitoring method and monitoring system Download PDFInfo
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- CN111722152A CN111722152A CN202010609994.2A CN202010609994A CN111722152A CN 111722152 A CN111722152 A CN 111722152A CN 202010609994 A CN202010609994 A CN 202010609994A CN 111722152 A CN111722152 A CN 111722152A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to the technical field of transformer detection, and aims to provide a transformer winding deformation monitoring method for monitoring the winding deformation states of two main transformers, wherein the two main transformers are changed into a double-winding transformer running in parallel, and the method comprises the following steps of: acquiring current values of two main transformer low-voltage side windings; obtaining the current ratio of the two main transformer low-voltage side windings according to the current values of the two main transformer low-voltage side windings; obtaining the real-time short-circuit impedance ratio of the low-voltage side windings of the two main transformers according to the current ratio of the low-voltage side windings of the two main transformers; obtaining a standard short circuit impedance ratio of two main transformer low-voltage side windings; obtaining an impedance error value according to the real-time short-circuit impedance ratio of the low-voltage side windings of the two main transformers and the standard short-circuit impedance ratio of the low-voltage side windings of the two main transformers; and obtaining the winding deformation states of the two main transformers according to the impedance error value. The invention also discloses a transformer winding deformation monitoring system. The transformer winding deformation monitoring method is simple and easy to implement, and the monitoring result is sensitive and reliable.
Description
Technical Field
The invention relates to the technical field of transformer detection, in particular to a transformer winding deformation monitoring method and a transformer winding deformation monitoring system.
Background
The main transformer (called as "main transformer" for short) is the core equipment of the transformer substation, and is also the most expensive equipment, and in the long-term operation process, the transformer always suffers from various external short circuit impacts, the mechanical impact force generated by the short circuit can cause the mechanical deformation of the transformer winding, and the accumulated effect after multiple short circuit impacts can directly cause the damage of the main transformer, thereby affecting the safe and stable operation of the power grid. The most effective way to detect the winding deformation is still the power failure. However, the power failure detection needs maintenance personnel, the detection period is long, and the manpower resource is extremely consumed.
In order to avoid the problem of long detection period caused by power failure detection, an online detection method for winding deformation has been provided in the prior art. The existing winding deformation on-line monitoring is mainly divided into two categories, namely a vibration method and a short-circuit impedance parameter identification method, wherein the vibration method is mainly used for monitoring the vibration condition of a transformer by a sensor attached to the surface of the transformer to judge whether the winding deformation occurs; however, this method lacks a clear judgment standard and is greatly affected by the operating environment. The short-circuit impedance parameter identification method estimates the short-circuit impedance by testing the voltage and current of each side of the voltage transformation; but the method has more uncontrollable factors and larger error.
Therefore, there is a need to develop a transformer winding deformation monitoring method and system that is simple and feasible and has sensitive and reliable monitoring results.
Disclosure of Invention
The invention aims to solve the technical problems at least to a certain extent, and provides a transformer winding deformation monitoring method and a monitoring system.
The technical scheme adopted by the invention is as follows:
the invention discloses a transformer winding deformation monitoring method, which is used for monitoring the winding deformation state of two main transformers, wherein the two main transformers are changed into a double-winding transformer running in parallel, and the method comprises the following steps:
acquiring current values of two main transformer low-voltage side windings;
obtaining the current ratio of the two main transformer low-voltage side windings according to the current values of the two main transformer low-voltage side windings;
obtaining the real-time short-circuit impedance ratio of the low-voltage side windings of the two main transformers according to the current ratio of the low-voltage side windings of the two main transformers;
obtaining a standard short circuit impedance ratio of two main transformer low-voltage side windings;
obtaining an impedance error value according to the real-time short-circuit impedance ratio of the low-voltage side windings of the two main transformers and the standard short-circuit impedance ratio of the low-voltage side windings of the two main transformers;
and obtaining the winding deformation states of the two main transformers according to the impedance error value.
Preferably, the winding deformation state of the two main transformers is a severe deformation state or a slight deformation state.
Further preferably, when the winding deformation states of the two main transformers are obtained according to the impedance error value, the specific steps are as follows:
acquiring the rated capacity of a main transformer;
when the rated capacity of the main transformer is below 100MVA, judging whether the impedance error value is greater than 3%, if so, outputting that the winding of the main transformer is in a severe deformation state; if not, entering the next step;
judging whether the impedance error value is greater than 2%, if so, outputting the winding of the main transformer to be in a slight deformation state; if not, the operation is not carried out;
when the rated capacity of the main transformer is greater than 100MVA, judging whether the impedance error value is greater than 2%, if so, outputting that the winding of the main transformer is in a severe deformation state; if not, entering the next step;
judging whether the impedance error value is larger than 1%, if so, outputting the winding of the main transformer to be in a slight deformation state; if not, the operation is not carried out.
Preferably, the real-time short-circuit impedance ratio of the two main transformer low-voltage side windings is equal to the current ratio of the two main transformer low-voltage side windings.
Preferably, an alternating current transducer is used to obtain the current values of the two main transformer low voltage side windings.
Preferably, the alternating current transmitter is an open-close type alternating current transmitter.
Preferably, the current ratio of the two main transformer low-voltage side windings is obtained by using a winding deformation online monitor according to the current values of the two main transformer low-voltage side windings.
Preferably, the standard short-circuit impedance values of the two main transformer low-voltage side windings are obtained, and then the standard short-circuit impedance ratio of the two main transformer low-voltage side windings is obtained.
The invention also discloses a transformer winding deformation monitoring system which is used for applying any one of the transformer winding deformation monitoring methods, and the transformer winding deformation monitoring system comprises two main transformers connected in parallel and an alternating current transmitter, wherein the alternating current transmitter is respectively used for acquiring the current values of the low-voltage side windings of the two main transformers.
Preferably, the transformer winding deformation monitoring system further comprises a winding deformation online detector, wherein the winding deformation online detector is used for receiving current values of two main transformer low-voltage side windings sent by the alternating current transducer, then calculating a current ratio of the two main transformer low-voltage side windings, and finally outputting winding deformation states of the two main transformers.
The invention has the beneficial effects that:
1) the transformer winding deformation monitoring method is simple and easy to implement, and the monitoring result is sensitive and reliable; specifically, in the implementation process, the real-time short-circuit impedance ratio of the two main transformer low-voltage side windings is obtained by measuring the current values of the two main transformer low-voltage side windings; then obtaining an impedance error value according to the real-time short-circuit impedance ratio of the low-voltage side windings of the two main transformers and the standard short-circuit impedance ratio of the low-voltage side windings of the two main transformers; and finally, obtaining the winding deformation states of the two main transformers according to the impedance error value. In the process of monitoring the winding deformation, monitoring signals can be only the current values of the low-voltage side windings of the two main transformers, and then the winding deformation states of the two main transformers can be obtained through the current values of the low-voltage side windings of the two main transformers;
2) the transformer winding deformation monitoring system is simple in structure, and the winding deformation states of the two main transformers can be conveniently and quickly obtained by using a transformer winding deformation monitoring method.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a transformer winding deformation monitoring system according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Specific structural and functional details disclosed herein are merely illustrative of example embodiments of the invention. This invention may, however, be embodied in many alternate forms and should not be construed as limited to the embodiments set forth herein.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments of the present invention.
It should be understood that, for the term "and/or" as may appear herein, it is merely an associative relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, B exists alone, and A and B exist at the same time; for the term "/and" as may appear herein, which describes another associative object relationship, it means that two relationships may exist, e.g., a/and B, may mean: a exists independently, and A and B exist independently; in addition, for the character "/" that may appear herein, it generally means that the former and latter associated objects are in an "or" relationship.
It will be understood that when an element is referred to herein as being "connected," "connected," or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. Conversely, if a unit is referred to herein as being "directly connected" or "directly coupled" to another unit, it is intended that no intervening units are present. In addition, other words used to describe the relationship between elements should be interpreted in a similar manner (e.g., "between … …" versus "directly between … …", "adjacent" versus "directly adjacent", etc.).
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, and/or groups thereof.
It should also be noted that, in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed substantially concurrently, or the figures may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
It should be understood that specific details are provided in the following description to facilitate a thorough understanding of example embodiments. However, it will be understood by those of ordinary skill in the art that the example embodiments may be practiced without these specific details. For example, systems may be shown in block diagrams in order not to obscure the examples in unnecessary detail. In other instances, well-known processes, structures and techniques may be shown without unnecessary detail in order to avoid obscuring example embodiments.
Example 1:
the embodiment provides a transformer winding deformation monitoring method, which is used for monitoring the winding deformation states of two main transformers, wherein the two main transformers are changed into a double-winding transformer running in parallel, and the method comprises the following steps:
acquiring current values of two main transformer low-voltage side windings;
obtaining the current ratio of the two main transformer low-voltage side windings according to the current values of the two main transformer low-voltage side windings;
obtaining the real-time short-circuit impedance ratio of the low-voltage side windings of the two main transformers according to the current ratio of the low-voltage side windings of the two main transformers;
obtaining a standard short circuit impedance ratio of two main transformer low-voltage side windings;
obtaining an impedance error value according to the real-time short-circuit impedance ratio of the low-voltage side windings of the two main transformers and the standard short-circuit impedance ratio of the low-voltage side windings of the two main transformers;
and obtaining the winding deformation states of the two main transformers according to the impedance error value.
The embodiment is simple and easy to implement, and the monitoring result is sensitive and reliable; specifically, in the implementation process of the embodiment, the real-time short-circuit impedance ratio of the two main transformer low-voltage side windings is obtained by measuring the current values of the two main transformer low-voltage side windings; then obtaining an impedance error value according to the real-time short-circuit impedance ratio of the low-voltage side windings of the two main transformers and the standard short-circuit impedance ratio of the low-voltage side windings of the two main transformers; and finally, obtaining the winding deformation states of the two main transformers according to the impedance error value. In the process of monitoring the winding deformation, the monitoring signal can be only the current values of the low-voltage side windings of the two main transformers, and then the winding deformation states of the two main transformers can be obtained through the current values of the low-voltage side windings of the two main transformers.
Example 2:
the embodiment provides a transformer winding deformation monitoring method, which is used for monitoring the winding deformation states of two main transformers, wherein the two main transformers are changed into a double-winding transformer running in parallel, and the method comprises the following steps:
acquiring current values of two main transformer low-voltage side windings;
obtaining the current ratio of the two main transformer low-voltage side windings according to the current values of the two main transformer low-voltage side windings;
obtaining the real-time short-circuit impedance ratio of the low-voltage side windings of the two main transformers according to the current ratio of the low-voltage side windings of the two main transformers;
obtaining a standard short circuit impedance ratio of two main transformer low-voltage side windings;
obtaining an impedance error value according to the real-time short-circuit impedance ratio of the low-voltage side windings of the two main transformers and the standard short-circuit impedance ratio of the low-voltage side windings of the two main transformers;
and obtaining the winding deformation states of the two main transformers according to the impedance error value. Specifically, the winding deformation state of the two main transformers is a severe deformation state or a slight deformation state. Two deformation states are output, the problem that the output speed is slow due to multiple operations can be avoided, the result is simple and reliable, and the method has guiding significance for a user to obtain the deformation state of the transformer winding.
Specifically, when the winding deformation states of the two main transformers are obtained according to the impedance error value, the method specifically comprises the following steps:
acquiring the rated capacity of a main transformer;
when the rated capacity of the main transformer is below 100MVA (megavolt-ampere, MAV, which represents a guaranteed value of the output power of the main transformer under rated working conditions), judging whether an impedance error value is larger than 3%, if so, outputting that a winding of the main transformer is in a severe deformation state, and prompting a user to immediately power off for verification; if not, entering the next step;
judging whether the impedance error value is greater than 2%, if so, outputting the winding of the main transformer to be in a slight deformation state, and prompting a user to perform diagnostic test on power failure as soon as possible; if not, the operation is not carried out;
when the rated capacity of the main transformer is larger than 100MVA, judging whether the impedance error value is larger than 2%, if so, outputting the winding of the main transformer to be in a severe deformation state, and prompting a user to immediately power off and verify; if not, entering the next step;
judging whether the impedance error value is larger than 1%, if so, outputting the winding of the main transformer to be in a slight deformation state, and prompting a user to perform diagnostic test on power failure as soon as possible; if not, the operation is not carried out.
In the embodiment, the output result is divided into two types according to different rated capacities of the main transformer, so that the method is suitable for the actual operation condition of the transformer, and the accuracy of result output is improved.
In this embodiment, the real-time short-circuit impedance ratio of the two main transformer low-voltage side windings is equal to the current ratio of the two main transformer low-voltage side windings.
Specifically, since the two main transformers become the dual-winding transformer operating in parallel, the voltages at the two ends of the short-circuit impedance of the low-voltage side windings of the two main transformers are the same, and the two main transformers are respectively defined as a main transformer No. 1 and a main transformer No. 2, so that the current ratio of the low-voltage side windings of the two main transformers is:
wherein, IL1For the current flowing through the low-voltage side winding of No. 1 main transformer, IL2The current flowing through the low-voltage side winding of the No. 2 main transformer,
the current ratio of two main transformer low-voltage side windings is obtained; z1Short-circuit impedance value, Z, of winding on low-voltage side of No. 1 main transformer2Is the short-circuit impedance value of the winding at the low-voltage side of the No. 2 main transformer,
the real-time short-circuit impedance ratio of the two main transformer low-voltage side windings is obtained.
In this embodiment, the current values of the two main transformer low-voltage side windings are obtained by using the alternating current transducer.
In this embodiment, the ac current transmitter is an open-close type ac current transmitter. It should be noted that the ac current transmitter is an open-close type ac current transmitter, which is more convenient for field maintenance.
In this embodiment, the current ratio of the two main transformer low-voltage side windings is obtained by using the winding deformation on-line monitor according to the current values of the two main transformer low-voltage side windings.
In this embodiment, the standard short-circuit impedance values of the two main transformer low-voltage side windings are obtained, and then the standard short-circuit impedance ratio of the two main transformer low-voltage side windings is obtained. Specifically, the standard short-circuit impedance values of the two main transformer low-voltage side windings are the short-circuit impedance values marked by the nameplate or the initial values in operation, and the standard short-circuit impedance ratio of the two main transformer low-voltage side windings is the ratio of the standard short-circuit impedance values of the two main transformer low-voltage side windings.
Example 3:
the embodiment discloses a transformer winding deformation monitoring system, as shown in fig. 1, which is used for the transformer winding deformation monitoring method in the application embodiment 1 or 2, and comprises two main transformers connected in parallel and an alternating current transmitter, wherein the alternating current transmitter is respectively used for acquiring current values of low-voltage side windings of the two main transformers.
In this embodiment, the transformer winding deformation monitoring system further includes a winding deformation online detector, where the winding deformation online detector is configured to receive current values of two main transformer low-voltage side windings sent by the ac current transformer, then calculate a current ratio of the two main transformer low-voltage side windings, and finally output winding deformation states of the two main transformers.
Specifically, the input end of the alternating current transmitter is electrically connected with the current output ends of the low-voltage side windings of the two main transformers respectively; the output end of the alternating current transmitter is electrically connected with the input end of the winding deformation on-line detector.
The transformer winding deformation monitoring system is simple in structure, and the winding deformation states of the two main transformers can be conveniently and quickly obtained by using a transformer winding deformation monitoring method.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and they may alternatively be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, or fabricated separately as individual integrated circuit modules, or fabricated as a single integrated circuit module from multiple modules or steps. Thus, the present invention is not limited to any specific combination of hardware and software.
The various embodiments described above are merely illustrative, and may or may not be physically separate, as they relate to elements illustrated as separate components; if reference is made to a component displayed as a unit, it may or may not be a physical unit, and may be located in one place or distributed over a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; 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: modifications of the technical solutions described in the embodiments or equivalent replacements of some technical features may still be made. 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.
Finally, it should be noted that the present invention is not limited to the above alternative embodiments, and that various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the claims, and which the description is intended to be interpreted accordingly.
Claims (10)
1. A transformer winding deformation monitoring method is used for monitoring the winding deformation state of two main transformers, and the two main transformers are changed into a double-winding transformer running in parallel, and is characterized in that: the method comprises the following steps:
acquiring current values of two main transformer low-voltage side windings;
obtaining the current ratio of the two main transformer low-voltage side windings according to the current values of the two main transformer low-voltage side windings;
obtaining the real-time short-circuit impedance ratio of the low-voltage side windings of the two main transformers according to the current ratio of the low-voltage side windings of the two main transformers;
obtaining a standard short circuit impedance ratio of two main transformer low-voltage side windings;
obtaining an impedance error value according to the real-time short-circuit impedance ratio of the low-voltage side windings of the two main transformers and the standard short-circuit impedance ratio of the low-voltage side windings of the two main transformers;
and obtaining the winding deformation states of the two main transformers according to the impedance error value.
2. The transformer winding deformation monitoring method according to claim 1, characterized in that: the winding deformation state of the two main transformers is a serious deformation state or a slight deformation state.
3. The transformer winding deformation monitoring method according to claim 2, characterized in that: according to the impedance error value, when the winding deformation states of the two main transformers are obtained, the method comprises the following specific steps:
acquiring the rated capacity of a main transformer;
when the rated capacity of the main transformer is below 100MVA, judging whether the impedance error value is greater than 3%, if so, outputting that the winding of the main transformer is in a severe deformation state; if not, entering the next step;
judging whether the impedance error value is greater than 2%, if so, outputting the winding of the main transformer to be in a slight deformation state; if not, the operation is not carried out;
when the rated capacity of the main transformer is greater than 100MVA, judging whether the impedance error value is greater than 2%, if so, outputting that the winding of the main transformer is in a severe deformation state; if not, entering the next step;
judging whether the impedance error value is larger than 1%, if so, outputting the winding of the main transformer to be in a slight deformation state; if not, the operation is not carried out.
4. The transformer winding deformation monitoring method according to claim 1, characterized in that: and the real-time short-circuit impedance ratio of the two main transformer low-voltage side windings is equal to the current ratio of the two main transformer low-voltage side windings.
5. The transformer winding deformation monitoring method according to claim 1, characterized in that: and acquiring current values of two main transformer low-voltage side windings by adopting an alternating current transducer.
6. The transformer winding deformation monitoring method according to claim 5, characterized in that: the alternating current transmitter is an open-close type alternating current transmitter.
7. The transformer winding deformation monitoring method according to claim 1, characterized in that: and obtaining the current ratio of the low-voltage side windings of the two main transformers by adopting a winding deformation online monitor according to the current values of the low-voltage side windings of the two main transformers.
8. The transformer winding deformation monitoring method according to claim 1, characterized in that: and obtaining the standard short-circuit impedance values of the low-voltage side windings of the two main transformers, and then obtaining the standard short-circuit impedance ratio of the low-voltage side windings of the two main transformers.
9. A transformer winding deformation monitoring system for applying the transformer winding deformation monitoring method of any one of claims 1 to 8, characterized in that: the transformer comprises two main transformers connected in parallel and an alternating current transmitter, wherein the alternating current transmitter is respectively used for acquiring current values of low-voltage side windings of the two main transformers.
10. The transformer winding deformation monitoring system of claim 9, wherein: the transformer winding deformation monitoring system further comprises a winding deformation online detector, wherein the winding deformation online detector is used for receiving current values of two main transformer low-voltage side windings sent by the alternating current transducer, then calculating the current ratio of the two main transformer low-voltage side windings, and finally outputting the winding deformation states of the two main transformers.
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