CN113325345B - Device and method for testing residual magnetism of transformer core - Google Patents
Device and method for testing residual magnetism of transformer core Download PDFInfo
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- CN113325345B CN113325345B CN202110613901.8A CN202110613901A CN113325345B CN 113325345 B CN113325345 B CN 113325345B CN 202110613901 A CN202110613901 A CN 202110613901A CN 113325345 B CN113325345 B CN 113325345B
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- 238000012360 testing method Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000005389 magnetism Effects 0.000 title claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims abstract description 8
- 230000000295 complement effect Effects 0.000 claims abstract description 4
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 16
- 230000004907 flux Effects 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000005347 demagnetization Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
The application provides a device for testing residual magnetism of a transformer core, which comprises: the device comprises a power supply, a voltage regulator, an intermediate transformer, a compensation capacitor, a current transformer, a voltage transformer, a power analyzer and a tested product; the power supply is electrically connected with one end of the voltage regulator through the molded case circuit breaker, the other end of the voltage regulator is electrically connected with one end of the intermediate transformer, the other end of the intermediate transformer is electrically connected with one end of the current transformer through the complementary capacitor, and the other end of the current transformer is electrically connected with the voltage transformer through the ammeter, the power tester and the voltmeter; the voltage transformer is electrically connected with the tested product. The application also provides a method for testing the residual magnetism of the transformer core. According to the method, the no-load test is carried out on the transformer before and after the direct resistance test, so that the remanence of the transformer is accurately calculated through measurement of parameters such as power, the probability of tripping of the air drop main transformer after pre-test and fixed detection is reduced, and safe and stable operation of the transformer is guaranteed.
Description
Technical Field
The application relates to the technical field of transformer core remanence, in particular to a device and a method for testing transformer core remanence.
Background
With the rapid development of industrial economy in China, the demand for electric power is rapidly increased, and the demand for reliable electric power supply is also increasing. The power transformer is one of important elements forming the power grid, and plays an extremely important role in safe and reliable power supply of the power grid. However, in recent years, the tripping condition of the main transformer during the operation after a plurality of pre-test tests at home and abroad occurs, which has serious influence on the reliability of power supply of the power grid, thereby causing huge economic loss and generating bad social benefit. Therefore, measuring transformer core remanence is of vital importance for grid power supply.
At present, technology in terms of demagnetization is mature day by day for transformer core remanence, but the problem of remanence measurement after demagnetization is not solved effectively all the time, so that safe and stable operation of the transformer cannot be guaranteed.
Disclosure of Invention
The application provides a device and a method for testing residual magnetism of a transformer core, which are used for solving the problem that the transformer cannot safely and stably run because the residual magnetism of the transformer core cannot be measured in the prior art.
In one aspect, the present application provides an apparatus for testing remanence of a transformer core, the apparatus mainly comprising:
the device comprises a power supply, a voltage regulator, an intermediate transformer, a compensation capacitor, a current transformer, a voltage transformer, a power analyzer and a tested product;
the power supply is electrically connected with one end of the voltage regulator through the molded case circuit breaker, the other end of the voltage regulator is electrically connected with one end of the intermediate transformer, the other end of the intermediate transformer is electrically connected with one end of the current transformer through the complementary capacitor, and the other end of the current transformer is electrically connected with the voltage transformer through the ammeter, the power tester and the voltmeter; the voltage transformer is electrically connected with the tested product.
In the technical scheme, the voltage regulator is used for regulating voltage, the intermediate transformer is boosted through the transformation ratio and is matched with the voltage regulator to boost the voltage to the rated voltage of the tested product, wherein the tested product refers to the tested transformer for measuring no-load loss.
In a preferred embodiment of the present application, the current transformer, the voltage transformer and the power analyzer form a testing device for measuring parameters of the power supply.
In the preferred embodiment of the present application, the power supply uses 400V ac.
In the preferred embodiment of the present application, the other end of the current transformer is connected in series with one end of the ammeter, the other end of the ammeter is connected in series with one end of the power tester, the other end of the power tester is electrically connected with the voltage transformer, and the voltage transformer is connected in parallel with the voltmeter.
On the other hand, the application also provides a method for testing the residual magnetism of the transformer core, which comprises the following specific steps:
when the transformer core has no remanence, measuring a first voltage, a first current and a first power of the power supply through a measuring device;
after the transformer performs a direct resistance test, measuring a second voltage, a second current and a second power of the power supply through a measuring device;
calculating means calculates a deviation value of the first power and the second power;
the calculating device calculates the remanence of the transformer according to the deviation value and the silicon steel sheet loss table; the silicon steel sheet loss meter comprises the type and the weight of a transformer iron core.
According to the technical scheme, the loss of the silicon steel sheet is related to the magnetic flux, when the weight of the silicon steel is unchanged, the loss is increased to indicate the increase of the magnetic flux, and the remanence of the transformer core can be obtained through the comparison of the magnetic flux. By inquiring the silicon steel sheet loss table, the deviation of magnetic flux values corresponding to different losses can be obtained.
In a preferred embodiment of the present application, the first voltage and the second voltage are both measured by a voltmeter, the first current and the second current are both measured by an ammeter, and the first power and the second power are both measured by a power analyzer.
In a preferred embodiment of the present application, the power analyzer is also used to measure the effective and average values of the voltage and the effective and power values of the current.
Compared with the prior art, the device and the method for testing the residual magnetism of the transformer core have the following beneficial effects:
according to the method, the no-load test is carried out on the transformer before and after the direct resistance test, so that the magnetic induction intensity deviation before and after the direct resistance test, namely the residual magnetism of the transformer, is accurately calculated through measurement of parameters such as power, and therefore the probability of tripping of the air drop main transformer after pre-test and fixed detection is reduced, and safe and stable operation of the transformer is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic circuit diagram of an apparatus for testing remanence of a transformer core according to embodiment 1;
fig. 2 is a flowchart of a method for testing the remanence of a transformer core according to embodiment 2.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present application, it should be noted that, the azimuth or positional relationship indicated by the terms "upper", "inner", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship that the inventive product is conventionally put in use, only for convenience of description and simplification of the description, and are not indicative or implying that the apparatus or element to be referred must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present application.
In the description of the present application, it should also be noted that the term "connected" is to be interpreted broadly, unless explicitly stated or defined otherwise, and may be, for example, an electrical connection or a communication connection. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between similar or similar objects or entities and not necessarily for describing a particular sequential or chronological order, unless otherwise indicated (Unless otherwise indicated). It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.
Furthermore, the terms "comprises," "comprising," and "including" and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements is not necessarily limited to those elements expressly listed but may include other elements not expressly listed or inherent to such product or apparatus.
Example 1
Referring to fig. 1, a schematic circuit diagram of an apparatus for testing residual magnetism of a transformer core is shown.
As shown in fig. 1, the device for testing residual magnetism of a transformer core provided by the application mainly comprises:
the device comprises a power supply, a voltage regulator, an intermediate transformer, a compensation capacitor, a Current Transformer (CT), a voltage transformer (PT), a power analyzer and a tested product;
the power supply is electrically connected with one end of a voltage regulator through a molded case circuit breaker, the other end of the voltage regulator is electrically connected with one end of an intermediate transformer, the other end of the intermediate transformer is electrically connected with one end of a current transformer through a complementary capacitor, and the other end of the Current Transformer (CT) is electrically connected with a voltage transformer (PT) through an ammeter, a power tester and a voltmeter; the voltage transformer (PT) is electrically connected with the tested object.
In this embodiment 1, the voltage regulator is used to regulate the voltage, the intermediate transformer is boosted by the transformation ratio, and the voltage is raised to the rated voltage of the test sample in cooperation with the voltage regulator, wherein the test sample in fig. 1 refers to the test transformer for measuring no-load loss.
In this embodiment 1, further, the Current Transformer (CT), the voltage transformer (PT) and the power analyzer constitute a testing device for measuring parameters of the power supply.
As shown in fig. 1, in this embodiment 1, further, the power supply source uses 400V ac power.
As shown in fig. 1, in this embodiment 1, further, the other end of the Current Transformer (CT) is connected in series with one end of the ammeter, the other end of the ammeter is connected in series with one end of the power tester, the other end of the power tester is electrically connected with the voltage transformer (PT), and the voltage transformer (PT) is connected in parallel with the voltmeter.
When the device for testing the remanence of the transformer core in embodiment 1 is used for testing a tested object, namely a tested transformer, the molded case circuit breaker needs to be closed to boost the voltage through the intermediate transformer, and the molded case circuit breaker has the functions of a breaking point during the step-down and tripping during the overcurrent.
It should be noted that, in embodiment 1, only a part of the connection relationships are listed, and specific connection relationships between the respective components can be accurately and without objection obtained by those skilled in the art from fig. 1, which is not described herein. Therefore, the undescribed components and their connection relationships should not be considered as limiting the scope of the technical solution of the present application.
Example 2
As shown in fig. 2, the present application further provides a method for testing residual magnetism of a transformer core, where the method specifically includes the following steps:
s101, when a transformer iron core has no remanence, measuring a first voltage, a first current and a first power of a power supply through a measuring device;
s102, after a direct resistance test is carried out on the transformer, measuring a second voltage, a second current and a second power of the power supply through a measuring device;
s103, calculating a deviation value of the first power and the second power by a calculating device;
s104, the calculation device calculates the remanence of the transformer according to the deviation value and the silicon steel sheet loss table; the silicon steel sheet loss meter comprises the type and the weight of a transformer iron core.
In particular, in embodiment 2, the direct resistance test in step S102 is performed by a device dedicated to the direct resistance test, regardless of the device for testing the residual magnetism of the transformer core disclosed in embodiment 1.
As shown in fig. 1, in the present embodiment 2, further, the first voltage and the second voltage in step S101 and step S102 are measured by a voltmeter, the first current and the second current are measured by an ammeter, and the first power and the second power are measured by a power analyzer.
In example 2, the loss of the silicon steel sheet in step S104 is related to the magnetic flux, and when the silicon steel weight is not changed, the loss increase indicates the increase of the magnetic flux, and the residual magnetic flux of the transformer core can be obtained by the comparison of the magnetic fluxes. By inquiring the silicon steel sheet loss table, the deviation of magnetic flux values corresponding to different losses can be obtained.
In this embodiment 2, further, the power analyzer is also used to measure the effective value and average value of the voltage and the effective value and power value of the current.
Referring to fig. 1 and 2, when the test article in fig. 1, i.e., the test transformer is tested by using the method for testing the remanence of the transformer core of the present embodiment 2, firstly, the molded case circuit breaker needs to be closed; then, the voltage is regulated and boosted through a voltage regulator and an intermediate transformer, and data such as voltage, current, power and the like are respectively read through each tester (including a voltmeter, an ammeter and a power meter) in the figure 1; stopping boosting when the average voltage value reaches the rated voltage of the tested transformer, and recording the loss value; and finally, reducing the voltage by a voltage regulator, and switching off the molded case circuit breaker.
The foregoing detailed description of the embodiments is merely illustrative of the general principles of the present application and should not be taken in any way as limiting the scope of the invention. Any other embodiments developed in accordance with the present application without inventive effort are within the scope of the present application for those skilled in the art.
Claims (7)
1. An apparatus for testing remanence of a transformer core, said apparatus comprising:
the device comprises a power supply, a voltage regulator, an intermediate transformer, a compensation capacitor, a current transformer, a voltage transformer, a power analyzer, a computing device and a tested product;
the power supply is electrically connected with one end of a voltage regulator through a molded case circuit breaker, the other end of the voltage regulator is electrically connected with one end of an intermediate transformer, the other end of the intermediate transformer is electrically connected with one end of a current transformer through a complementary capacitor, the other end of the current transformer is electrically connected with a voltage transformer through an ammeter, a power tester and a voltmeter, the voltmeter is used for measuring a first voltage of the power supply when a transformer core has no remanence and a second voltage of the power supply after the transformer performs a direct resistance test, the ammeter is used for measuring a first current of the power supply when the transformer core has no remanence and a second current of the power supply after the transformer performs the direct resistance test, and the power analyzer is used for measuring a first power of the power supply when the transformer core has no remanence and a second power of the power supply after the transformer performs the direct resistance test; the voltage transformer is electrically connected with the tested product;
the calculating device is used for calculating the deviation value of the first power and the second power and calculating the remanence of the transformer according to the deviation value and the silicon steel sheet loss table; the silicon steel sheet loss meter comprises the model and the weight of the transformer iron core and is used for confirming the deviation of the magnetic flux value corresponding to the silicon steel sheet loss.
2. The device for testing residual magnetism of a transformer core according to claim 1, wherein the current transformer, the voltage transformer and the power analyzer constitute a testing device for measuring parameters of the power supply.
3. A device for testing the remanence of a transformer core according to claim 1 or 2, wherein the power supply uses 400V ac.
4. The device for testing residual magnetism of a transformer core according to claim 1, wherein the other end of the current transformer is connected in series with one end of the ammeter, the other end of the ammeter is connected in series with one end of the power tester, the other end of the power tester is electrically connected with the voltage transformer, and the voltage transformer is connected in parallel with the voltmeter.
5. A method for testing the remanence of a transformer core, characterized in that it is applied to a device for testing the remanence of a transformer core according to any one of claims 1-4, said method comprising the specific steps of:
when the transformer core has no remanence, measuring a first voltage, a first current and a first power of a power supply through the device for testing;
measuring a second voltage, a second current and a second power of the power supply through the device for testing after the transformer performs a direct resistance test;
calculating means calculates a deviation value of the first power and the second power;
the calculating device calculates the remanence of the transformer according to the deviation value and the silicon steel sheet loss table; the silicon steel sheet loss meter comprises the model and the weight of the transformer iron core and is used for confirming the deviation of the magnetic flux value corresponding to the silicon steel sheet loss.
6. The method of claim 5, wherein the first voltage and the second voltage are each measured by a voltmeter, the first current and the second current are each measured by an ammeter, and the first power and the second power are each measured by a power analyzer.
7. The method of claim 6, wherein the power analyzer is further configured to measure an effective value of current, a power value, and an effective value and average value of voltage.
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| CN202110613901.8A CN113325345B (en) | 2021-06-02 | 2021-06-02 | Device and method for testing residual magnetism of transformer core |
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| CN202110613901.8A CN113325345B (en) | 2021-06-02 | 2021-06-02 | Device and method for testing residual magnetism of transformer core |
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