CN111722152B - Transformer winding deformation monitoring method and monitoring system - Google Patents
Transformer winding deformation monitoring method and monitoring system Download PDFInfo
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- CN111722152B CN111722152B CN202010609994.2A CN202010609994A CN111722152B CN 111722152 B CN111722152 B CN 111722152B CN 202010609994 A CN202010609994 A CN 202010609994A CN 111722152 B CN111722152 B CN 111722152B
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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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 winding deformation states of two main transformers, namely a double-winding transformer with the two main transformers running in parallel, which 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 real-time short-circuit impedance ratio of the two main transformer low-voltage side windings according to the current ratio of the two main transformer low-voltage side windings; obtaining 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 two main transformer low-voltage side windings and the standard short-circuit impedance ratio of the two main transformer low-voltage side windings; and obtaining 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 feasible, 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 (main transformer for short) is core equipment of a transformer substation and is also the most expensive equipment, the transformer always suffers various external short-circuit impacts in the long-term operation process, the mechanical impact force generated by the short circuit can cause the transformer winding to generate mechanical deformation, and the accumulated effect after multiple short-circuit impacts can directly lead to main deterioration to influence the safe and stable operation of a power grid. The most effective way for winding deformation is still power outage detection. However, the power failure detection needs maintenance personnel to perform, 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 developed in the prior art. The existing online monitoring of winding deformation is divided into two major types, namely a vibration method and a short-circuit impedance parameter identification method, wherein the vibration method is mainly used for judging whether winding deformation occurs or not by monitoring the vibration condition of a transformer through a sensor attached to the surface of the transformer; however, this method lacks clear judgment criteria and is greatly affected by the operating environment. The short-circuit impedance parameter identification method estimates short-circuit impedance by testing voltage and current of each side of the transformer; but the method has more uncontrollable factors and larger errors.
Therefore, it is necessary to research a transformer winding deformation monitoring method and a monitoring system which are simple and easy to implement and have 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 transformer winding deformation 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 winding deformation states of two main transformers, wherein the two main transformers are double-winding transformers which are operated in parallel, and 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 real-time short-circuit impedance ratio of the two main transformer low-voltage side windings according to the current ratio of the two main transformer low-voltage side windings;
obtaining 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 two main transformer low-voltage side windings and the standard short-circuit impedance ratio of the two main transformer low-voltage side windings;
and obtaining 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 winding deformation states of the two main transformers are obtained according to the impedance error value, the specific steps are as follows:
acquiring rated capacity of the main transformer;
when the rated capacity of the main transformer is below 100MVA, judging whether the impedance error value is more than 3%, if so, outputting a winding of the main transformer to be in a serious deformation state; if not, entering the next step;
judging whether the impedance error value is more than 2%, if so, outputting the winding of the main transformer to be in a slight deformation state; if not, the device does not act;
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 a winding of the main transformer to be in a serious deformation state; if not, entering the next step;
judging whether the impedance error value is greater than 1%, if so, outputting the winding of the main transformer to be in a slight deformation state; if not, the operation is not performed.
Preferably, the real-time short-circuit impedance ratio of the two main transformer low-voltage side windings=the current ratio of the two main transformer low-voltage side windings.
Preferably, an alternating current transducer is used for acquiring the current values of the two main transformer low-voltage side windings.
Preferably, the ac current transducer is an open-close ac current transducer.
Preferably, a winding deformation on-line monitor is adopted to obtain 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.
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 the transformer winding deformation monitoring method of any one of the above steps, and comprises two main transformers connected in parallel and also comprises alternating current transmitters which are respectively used for collecting current values of the windings at the low-voltage sides of the two main transformers.
Preferably, the transformer winding deformation monitoring system further comprises a winding deformation on-line detector, wherein the winding deformation on-line detector is used for receiving current values of the two main transformer low-voltage side windings sent by the alternating current transducer, then calculating current ratios of the two main transformer low-voltage side windings, and finally outputting winding deformation states of the two main transformers.
The beneficial effects of the invention are as follows:
1) The transformer winding deformation monitoring method is simple and feasible, and the monitoring result is sensitive and reliable; specifically, in the implementation process, the current values of the two main transformer low-voltage side windings are measured to obtain the real-time short-circuit impedance ratio 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 two main transformer low-voltage side windings and the standard short-circuit impedance ratio of the two main transformer low-voltage side windings; and finally, obtaining 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 two main transformer low-voltage side windings, then the winding deformation states of the two main transformers can be obtained through the current values of the two main transformer low-voltage side windings, in the process, the online detection can be carried out in the working process of the transformer, meanwhile, the influence of other uncontrollable factors is avoided, the monitoring process is simple and easy, and the monitoring result is sensitive and reliable;
2) The transformer winding deformation monitoring system is simple in structure, and winding deformation states of two main transformers can be conveniently and rapidly obtained by using the transformer winding deformation monitoring method.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a transformer winding deformation monitoring system according to the present invention.
Detailed Description
The invention will be further elucidated with reference to the drawings and to specific embodiments. The present invention is not limited to these examples, although they are described in order to assist understanding of the present invention. Specific structural and functional details disclosed herein are merely representative 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 element. 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" that may appear herein, it is merely one association relationship that describes an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a alone, B alone, and both a and B; for the term "/and" that may appear herein, which is descriptive of another associative object relationship, it means that there may be two relationships, e.g., a/and B, it may be expressed that: a alone, a alone and B alone; in addition, for the character "/" that may appear herein, it is generally indicated that the context associated object is 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. In contrast, when an element is referred to herein as being "directly connected" or "directly coupled" to another element, it means that there are no intervening elements present. In addition, other words used to describe relationships between elements (e.g., "between … …" pair "directly between … …", "adjacent" pair "directly adjacent", etc.) should be interpreted in a similar manner.
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," "including" and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, and do not preclude the presence or addition of one or more other features, quantities, steps, operations, elements, components, and/or groups thereof.
It should be appreciated that in some alternative embodiments, 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 provide a thorough understanding of the 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, a system may be shown in block diagrams in order to avoid obscuring the examples with unnecessary detail. In other instances, well-known processes, structures, and techniques may be shown without unnecessary detail in order to avoid obscuring the example embodiments.
Example 1:
the embodiment provides a transformer winding deformation monitoring method, which is used for monitoring winding deformation states of two main transformers, wherein the two main transformers are double-winding transformers which are operated in parallel, and 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 real-time short-circuit impedance ratio of the two main transformer low-voltage side windings according to the current ratio of the two main transformer low-voltage side windings;
obtaining 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 two main transformer low-voltage side windings and the standard short-circuit impedance ratio of the two main transformer low-voltage side windings;
and obtaining winding deformation states of the two main transformers according to the impedance error value.
The embodiment is simple and easy to operate, and the monitoring result is sensitive and reliable; specifically, in the implementation process of the embodiment, the current values of the two main transformer low-voltage side windings are measured to obtain the real-time short-circuit impedance ratio 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 two main transformer low-voltage side windings and the standard short-circuit impedance ratio of the two main transformer low-voltage side windings; and finally, obtaining 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 two main transformer low-voltage side windings, then the winding deformation states of the two main transformers can be obtained through the current values of the two main transformer low-voltage side windings, in the process, the online detection can be carried out in the working process of the transformer, meanwhile, the influence of other uncontrollable factors is avoided, the monitoring process is simple and easy, and the monitoring result is sensitive and reliable.
Example 2:
the embodiment provides a transformer winding deformation monitoring method, which is used for monitoring winding deformation states of two main transformers, wherein the two main transformers are double-winding transformers which are operated in parallel, and 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 real-time short-circuit impedance ratio of the two main transformer low-voltage side windings according to the current ratio of the two main transformer low-voltage side windings;
obtaining 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 two main transformer low-voltage side windings and the standard short-circuit impedance ratio of the two main transformer low-voltage side windings;
and obtaining 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 severely deformed state or a slightly deformed state. The two deformation states are output, the problem of slow output speed caused by multiple operations can be avoided, the result is simple and reliable, and the method has guiding significance for a user to acquire the deformation state of the transformer winding.
Specifically, when winding deformation states of two main transformers are obtained according to the impedance error value, the specific steps are as follows:
acquiring rated capacity of the main transformer;
when the rated capacity of the main transformer is 100MVA (megavolt-amp, MAV, a guaranteed value of the output power of the main transformer under rated working conditions), judging whether the impedance error value is more than 3%, if so, outputting a severe deformation state of a winding of the main transformer, and prompting a user to immediately check the power failure; if not, entering the next step;
judging whether the impedance error value is greater than 2%, if so, outputting that the winding of the main transformer is in a slight deformation state, and prompting a user to perform diagnostic test by powering off as soon as possible; if not, the device does not act;
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 that the winding of the main transformer is in a serious deformation state, and prompting a user that the power failure needs to be immediately verified; if not, entering the next step;
judging whether the impedance error value is greater than 1%, if so, outputting that the winding of the main transformer is in a slight deformation state, and prompting a user to perform diagnostic test by cutting off power as soon as possible; if not, the operation is not performed.
In this embodiment, the output result is divided into two types by different rated capacities of the main transformer, and is suitable for the actual running condition of the transformer, so that the accuracy of the output result is improved.
In this embodiment, the real-time short-circuit impedance ratio of the two main transformer low-voltage side windings=the current ratio of the two main transformer low-voltage side windings.
Specifically, since the two main transformers are double-winding transformers which operate in parallel, the voltages at the two ends of the short-circuit impedance of the two main transformer low-voltage side windings are the same, and the two main transformers are respectively defined as a No. 1 main transformer and a No. 2 main transformer, the current ratio of the two main transformer low-voltage side windings is as follows:
wherein I is L1 For the current flowing through the winding on the low-voltage side of the main transformer No. 1, I L2 To flow the current through the winding on the low side of main transformer No. 2,
the current ratio of the windings at the low-voltage side of the two main transformer; z is Z 1 Short-circuit impedance value Z of low-voltage side winding of No. 1 main transformer 2 Short-circuit impedance value of low-voltage side winding of main transformer No. 2->
The real-time short-circuit impedance ratio of the low-voltage side windings is changed for the two main transformer.
In this embodiment, an ac current transducer is used to obtain the current values of the two windings on the low-voltage side of the main transformer.
In this embodiment, the ac current transducer is an open-close ac current transducer. It should be noted that, the ac current transducer is an open-close ac current transducer, which is more convenient for field maintenance.
In this embodiment, a winding deformation on-line monitor is adopted to obtain 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.
In this embodiment, standard short-circuit impedance values of the two main transformer low-voltage side windings are obtained, and then standard short-circuit impedance ratios of the two main transformer low-voltage side windings are obtained. Specifically, the standard short-circuit impedance value of the two main transformer low-voltage side windings is the short-circuit impedance value marked by a nameplate or the initial value 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 applying the transformer winding deformation monitoring method of embodiment 1 or 2, and comprises two main transformers connected in parallel, and also comprises alternating current transmitters, wherein the alternating current transmitters are respectively used for collecting current values of the windings at the low-voltage sides of the two main transformers.
In this embodiment, the transformer winding deformation monitoring system further includes a winding deformation on-line detector, where the winding deformation on-line detector is configured to receive current values of the two main transformer low-voltage side windings sent by the ac current transducer, 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 ends of the alternating current transmitter are respectively and electrically connected with the current output ends of the low-voltage side windings of the two main transformers; the output end of the alternating current transducer 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 winding deformation states of two main transformers can be conveniently and rapidly obtained by using the transformer winding deformation monitoring method.
It will be apparent to those skilled in the art that the modules or steps of the invention described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, or they may alternatively be implemented in program code executable by computing devices, such that they may be stored in a memory device for execution by the computing devices, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps within them may be fabricated into a single integrated circuit module. 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 if reference is made to the unit being described as separate components; if a component is referred to as being a unit, it may or may not be a physical unit, may be located in one place, or may be distributed over multiple network elements. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some of the technical features thereof can be replaced by equivalents. Such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Finally, it should be noted that the invention is not limited to the alternative embodiments described above, but can be used by anyone in various other forms of products in the light of the present invention. The above detailed description should not be construed as limiting the scope of the invention, which is defined in the claims and the description may be used to interpret the claims.
Claims (9)
1. A transformer winding deformation monitoring method is used for monitoring winding deformation states of two main transformers, and the two main transformers are double-winding transformers which are operated 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 real-time short-circuit impedance ratio of the two main transformer low-voltage side windings according to the current ratio of the two main transformer low-voltage side windings; wherein, the real-time short-circuit impedance ratio of the two main transformer low-voltage side windings = the current ratio of the two main transformer low-voltage side windings;
obtaining 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 two main transformer low-voltage side windings and the standard short-circuit impedance ratio of the two main transformer low-voltage side windings;
and obtaining winding deformation states of the two main transformers according to the impedance error value.
2. A transformer winding deformation monitoring method according to claim 1, characterized in that: the winding deformation state of the two main transformers is a severe deformation state or a slight deformation state.
3. A transformer winding deformation monitoring method according to claim 2, characterized in that: when the winding deformation states of the two main transformers are obtained according to the impedance error values, the specific steps are as follows:
acquiring rated capacity of the main transformer;
when the rated capacity of the main transformer is below 100MVA, judging whether the impedance error value is more than 3%, if so, outputting a winding of the main transformer to be in a serious deformation state; if not, entering the next step;
judging whether the impedance error value is more than 2%, if so, outputting the winding of the main transformer to be in a slight deformation state; if not, the device does not act;
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 a winding of the main transformer to be in a serious deformation state; if not, entering the next step;
judging whether the impedance error value is greater than 1%, if so, outputting the winding of the main transformer to be in a slight deformation state; if not, the operation is not performed.
4. A transformer winding deformation monitoring method according to claim 1, characterized in that: and acquiring current values of the two main transformer low-voltage side windings by adopting an alternating current transducer.
5. The transformer winding deformation monitoring method according to claim 4, wherein: the alternating current transducer is an open-close alternating current transducer.
6. A transformer winding deformation monitoring method according to claim 1, characterized in that: and obtaining the current ratio of the two main transformer low-voltage side windings by adopting a winding deformation on-line monitor according to the current values of the two main transformer low-voltage side windings.
7. A transformer winding deformation monitoring method according to claim 1, characterized in that: and obtaining standard short-circuit impedance values of the two main transformer low-voltage side windings, and then obtaining the standard short-circuit impedance ratio of the two main transformer low-voltage side windings.
8. A transformer winding deformation monitoring system for applying the transformer winding deformation monitoring method of any one of claims 1 to 7, characterized in that: the alternating current transformer comprises two main transformers connected in parallel and also comprises alternating current transmitters, wherein the alternating current transmitters are respectively used for collecting current values of the windings on the low-voltage sides of the two main transformers.
9. A transformer winding deformation monitoring system according to claim 8, wherein: the transformer winding deformation monitoring system further comprises a winding deformation on-line detector, wherein the winding deformation on-line detector is used for receiving current values of the 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 winding deformation states of the two main transformers.
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