CN115219959B - Dry air reactor turn-to-turn short circuit magnetic field detection device based on magnetic resistance effect - Google Patents
Dry air reactor turn-to-turn short circuit magnetic field detection device based on magnetic resistance effect Download PDFInfo
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- CN115219959B CN115219959B CN202210808142.5A CN202210808142A CN115219959B CN 115219959 B CN115219959 B CN 115219959B CN 202210808142 A CN202210808142 A CN 202210808142A CN 115219959 B CN115219959 B CN 115219959B
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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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- 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
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a magnetic field detection device for turn-to-turn short circuit of a dry air reactor based on a magneto-resistance effect, which comprises a magnetic field measurement probe arranged close to the dry air reactor, a stabilized voltage power supply and a data acquisition processing module, wherein the stabilized voltage power supply and the data acquisition processing module are respectively connected with the magnetic field measurement probe, and the magnetic field measurement probe adopts a Wheatstone bridge structure. The invention has the beneficial effects that: the working condition judgment of the reactor is realized; the magnetic field measuring probe has the advantages of high sensitivity, strong anti-interference capability, low power consumption, high response frequency and the like, and can reliably complete the detection of the turn-to-turn short circuit fault magnetic field of the reactor; the normal working and running of the reactor are not affected, and the safety of the testers is ensured at the same time; electrical isolation is achieved.
Description
[ Field of technology ]
The invention relates to the technical field of power equipment fault detection, in particular to a dry-type air-core reactor turn-to-turn short circuit magnetic field detection device based on a magneto-resistance effect.
[ Background Art ]
With the continuous expansion of the power grid scale, the voltage class is continuously increased, and a large number of reactors are required to be used for filtering, current limiting and reactive compensation in the existing power system. The dry air core reactor is widely used as an important power device because of the advantages of high mechanical strength, simple structure, good linearity, convenient maintenance and the like.
Dry air-core reactors are usually installed outdoors and are subject to environmental factors such as wind, sun, rain and the like throughout the year, so accidents frequently occur. According to the related statistics results, most accidents are caused by turn-to-turn short circuit faults, and if the fault state cannot be detected and judged timely, the huge current formed by the short circuit can cause local temperature rise at the fault position, so that a reactor can be burnt out, and the safe and stable operation of a power system can be influenced.
In the aspect of the turn-to-turn short circuit fault detection of the dry air-core reactor, the main detection methods at present are a temperature detection method, an electric quantity detection method and a detection coil method.
The temperature detection method is to use a temperature sensor to measure local temperature rise caused by turn-to-turn short circuit faults of the reactor, and the working state of the reactor is reflected by detecting the change of the temperature. However, in the practical application process, the temperature sensor is pre-embedded in the envelope of the reactor before leaving the factory, so that the method is not suitable for the reactor which is put into operation and requires high cost.
The electrical quantity detection method is to judge whether a fault occurs by detecting a change of an electrical parameter, wherein the electrical quantity comprises voltage, current, impedance and the like. However, due to the self-inductance characteristic of the reactor, the actual change of the electrical quantity before and after the turn-to-turn short circuit fault of the reactor is not obvious, so that the method for detecting the change of the electrical quantity by adopting the corresponding electrical quantity detection device may not be capable of effectively reflecting the occurrence of the turn-to-turn short circuit fault and lacks certain reliability.
The detection method of the detection coil is essentially a method for detecting the turn-to-turn short circuit fault of the reactor indirectly through a magnetic field signal. When the turn-to-turn short circuit fault occurs, the space magnetic field distribution of the reactor is not in up-down symmetrical distribution, so that the induction coils are arranged at the up-down symmetrical positions of the reactor, and the induction coils arranged at the two ends of the dry air-core reactor can generate difference values due to different magnetic fluxes passing through the reactor up and down, thereby realizing fault detection. However, this method has the following disadvantages: firstly, the arrangement of the induction coil may have an influence on the normal operation of the reactor; secondly, when the turn-to-turn short circuit fault degree of the reactor is smaller and the number of short circuit turns is smaller, the change of magnetic flux is not obvious; thirdly, if the fault occurs at the transverse axis of the middle point of the upper and lower parts of the reactor, the symmetrical distribution of the upper and lower magnetic fields is not affected, and the magnetic fluxes at the two ends have no difference, so that the method has a certain measurement blind area.
[ Invention ]
The invention discloses a magnetoresistance effect-based dry air-core reactor turn-to-turn short circuit magnetic field detection device, which can effectively solve the technical problems related in the background art.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
The magnetic field detection device comprises a magnetic field measurement probe, a stabilized voltage power supply and a data acquisition processing module, wherein the magnetic field measurement probe is arranged close to the dry air reactor, the stabilized voltage power supply and the data acquisition processing module are respectively connected with the magnetic field measurement probe, the magnetic field measurement probe adopts a Wheatstone bridge structure, the Wheatstone bridge structure comprises a first bridge arm provided with a first resistor R1, a second bridge arm provided with a second resistor R2, a third bridge arm provided with a third resistor R3, a fourth bridge arm provided with a fourth resistor R4, a voltage input end V cc and a voltage output end V 0, one end of the first bridge arm is connected with the voltage input end V cc, the other end of the first bridge arm is connected with one end of the third bridge arm, and the other end of the third bridge arm is grounded; one end of the second bridge arm is connected with a power supply V cc, the other end of the second bridge arm is connected with one end of the fourth bridge arm, the other end of the fourth bridge arm is grounded, and the voltage output end V 0 is respectively connected between the first bridge arm and the third bridge arm and between the second bridge arm and the fourth bridge arm; the resistance values of the first resistor R1 and the fourth resistor R4, and the second resistor R2 and the third resistor R3 are the same, and the resistance values of the adjacent resistors are opposite.
As a preferable improvement of the invention, the data acquisition processing module comprises an A/D converter for signal acquisition, a communication module connected with the A/D converter for data transmission and a CPU single chip microcomputer connected with the communication module for completing real-time operation of magnetic field data.
As a preferable modification of the present invention, the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are each made of a magneto-resistive effect material.
As a preferred modification of the present invention, the magnetic field measuring probe employs a magnetoresistance effect sensing chip.
As a preferable improvement of the invention, the magnetic field measuring probe adopts two magneto-resistance effect sensing chips, the sensitive axes of the magneto-resistance effect sensing chips are arranged along the x axis and the z axis, and the magnetic field sizes of the dry type air core reactor in the horizontal direction and the vertical direction are respectively measured.
As a preferable improvement of the invention, the data acquisition processing module is connected with the upper computer in a wireless way.
The beneficial effects of the invention are as follows:
1. the working condition judgment of the reactor is realized by directly collecting the turn-to-turn short circuit fault magnetic field data of the dry type air-core reactor;
2. The magnetic resistance effect sensing chip is adopted as the magnetic field measuring probe, so that the magnetic field measuring probe has the advantages of high sensitivity, strong anti-interference capability, low power consumption, high response frequency and the like, and the detection of the inter-turn short circuit fault magnetic field of the reactor can be reliably completed;
3. The magnetic field measuring probe is not in direct physical contact with the reactor, so that the normal working and running of the reactor are not influenced, and the safety of a tester is ensured at the same time;
4. The data acquisition processing module transmits the acquired signals to the upper computer in a wireless transmission mode, so that electrical isolation is realized.
[ Description of the drawings ]
For a clearer description of the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:
FIG. 1 is a schematic diagram of a structure of a device for detecting a turn-to-turn short circuit magnetic field of a dry air reactor based on a magneto-resistive effect;
fig. 2 is a schematic diagram of the magnetic field detection device for detecting a dry air-core reactor according to the present invention;
Fig. 3 is a diagram of a wheatstone bridge configuration of the present invention.
[ Detailed description ] of the invention
The technical solutions of the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
Referring to fig. 1 and 2, the present invention provides a device for detecting a turn-to-turn short circuit magnetic field of a dry air-core reactor based on a magneto-resistive effect, which comprises a magnetic field measuring probe 2 arranged near the dry air-core reactor 1, and a stabilized voltage power supply 3 and a data acquisition processing module 4 respectively connected with the magnetic field measuring probe 2.
The magnetic field measurement probe 2 adopts a wheatstone bridge structure, as shown in fig. 3, wherein the wheatstone bridge structure comprises a first bridge arm 21 provided with a first resistor R1, a second bridge arm 22 provided with a second resistor R2, a third bridge arm 23 provided with a third resistor R3, a fourth bridge arm 24 provided with a fourth resistor R4, a voltage input end V cc and a voltage output end V 0, one end of the first bridge arm 21 is connected with the voltage input end V cc, the other end is connected with one end of the third bridge arm 23, and the other end of the third bridge arm 23 is grounded; one end of the second bridge arm 22 is connected with a power supply V cc, the other end of the second bridge arm 22 is connected with one end of the fourth bridge arm 24, and the other end of the fourth bridge arm 24 is grounded.
The voltage output terminal V 0 is connected between the first leg 21 and the third leg 23 and between the second leg 22 and the fourth leg 24, respectively; the resistance values of the first resistor R1 and the fourth resistor R4, and the second resistor R2 and the third resistor R3 are the same, and the resistance values of the adjacent resistors are opposite. When an external magnetic field acts, the resistance values of the first resistor R1 and the fourth resistor R4 are reduced, the resistance values of the second resistor R2 and the third resistor R3 are increased, and the output voltage of the full bridge is shown as formula 1.
Wherein: r is the resistance value of the magneto-resistance effect material, and DeltaR is the variation of resistance under the action of a magnetic field.
As can be seen from the formula (1), the voltage signal output by the magneto-resistive effect chip is in a direct proportion to the externally applied magnetic field, so that the magnitude of the magnetic field can be deduced from the output voltage signal, as shown in the formula 2.
B＝k·V0 (2)
Wherein: k is the proportionality coefficient between the output voltage and the magnetic field.
Meanwhile, the Wheatstone bridge structure can obviously amplify signals, so that voltage output is more obvious, temperature coefficients of magneto-resistance effect materials on the four bridge arms are the same, output signals are differential signals, resistance changes caused by temperature changes are counteracted, and temperature drift errors can be effectively eliminated.
Specifically, the magnetic field measuring probe adopts a magneto-resistance effect sensing chip, the magneto-resistance effect magnetic field sensing chip adopts a Wheatstone bridge structure, and after voltage is applied to the chip, differential voltage signals are output at two ends of the chip. The magnetic resistance effect sensing chip is provided with a magnetic field sensitive axis, only the magnetic field change in the direction of the sensitive axis can be induced, and in order to collect more magnetic field data, the magnetic field measuring probe 2 can be provided with two magnetic resistance effect sensing chips, and the sensitive axis is along the x axis and the z axis to respectively measure the magnetic field sizes of the dry type air-core reactor 1 in the horizontal direction and the vertical direction.
It should be further noted that, the reactor usually works under the power frequency condition, according to the working characteristics, the sampling frequency can be set between 3kHz and 10kHz, and the magnitude of the magnetic field applied to the magnetic field measuring probe is calculated in real time by using the voltage signal, and the variation difference of the magnetic field is calculated. The principle of 'taking five to three' is adopted, sampling is carried out for 5 times in a period of time, the sampling interval is 20ms, and if 3 groups of data in the sampled 5 groups are abnormal, the turn-to-turn short circuit fault of the reactor is indicated.
Specifically, the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are made of a magneto-resistive effect material. Thus, the magnitude of the magnetic field is reflected by the change of the resistance value of the magneto-resistance effect material in the magnetic field, and the obtained magnetic field data is analyzed to judge whether the turn-to-turn short circuit fault occurs in the reactor.
The data acquisition processing module 4 comprises an A/D converter 41 for signal acquisition, a communication module 42 connected with the A/D converter 41 for data transmission, and a CPU (Central processing Unit) singlechip 43 connected with the communication module 42 for completing real-time operation of magnetic field data.
The data acquisition processing module 4 is connected with the upper computer 5 in a wireless transmission manner, specifically, the wireless transmission employs a ZigBee network protocol to upload magnetic field data to the upper computer 5, wherein the wireless transmission distance is 30-100 m, the transmitted data is a magnetic field result, and the upper computer 5 stores and further analyzes the data. Of course, the long-distance wireless transmission can adopt a 485 protocol communication cable, and the communication cable is used for connecting the upper computer 5 to realize the long-distance transmission of data.
The magnetic field detection device provided by the invention will be described in detail below with reference to embodiment 1 for detecting a magnetic field in a dry air-core reactor.
Example 1
Referring to FIG. 2, the dry air reactor 1 has a capacity of 60kVA, a system voltage of 10kV, a rated current 189A, a rated inductance 5.349mH and a rated frequency of 50Hz. The arrangement of the magnetic field measuring means is shown in fig. 2.
A magnetic field measuring probe 2, a stabilized voltage supply 3 and a data acquisition processing module 4 are respectively arranged near an insulator 11 at the bottom of the lower part of the dry type air reactor 1. The number of the magnetic field measuring probes 2 is 3, and the magnetic field measuring probes are uniformly arranged on the right bottom horizontal shaft of the reactor 1. The stabilized voltage supply 3 supplies power to the magnetic field measuring probe 2, and the voltage class is 5V. The data acquisition processing module 4 samples the voltage signal output by the magnetic field measurement probe 2, and the sampling frequency is set to be 5kHz. And detecting the fluctuation of the magnetic field data obtained by sampling in a mode of taking 5 to take 3.
The data acquisition processing module 4 calculates the magnetic field magnitude and the magnetic field difference value, and uploads corresponding result data to the upper computer 5 in a wireless communication mode, so that electrical isolation is completed.
In this example, when the fluctuation of the sampled magnetic field data exceeds the set threshold value, it can be determined that the working condition of the reactor is abnormal: when the ratio of the magnetic field difference value to the magnetic field at the sampling point is larger than 0.05, the reactor can be considered to have turn-to-turn short circuit fault.
The beneficial effects of the invention are as follows:
1. the working condition judgment of the reactor is realized by directly collecting the turn-to-turn short circuit fault magnetic field data of the dry type air-core reactor;
2. The magnetic resistance effect sensing chip is adopted as the magnetic field measuring probe, so that the magnetic field measuring probe has the advantages of high sensitivity, strong anti-interference capability, low power consumption, high response frequency and the like, and the detection of the inter-turn short circuit fault magnetic field of the reactor can be reliably completed;
3. The magnetic field measuring probe is not in direct physical contact with the reactor, so that the normal working and running of the reactor are not influenced, and the safety of a tester is ensured at the same time;
4. The data acquisition processing module transmits the acquired signals to the upper computer in a wireless transmission mode, so that electrical isolation is realized.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (3)
1. The magnetic field detection device for the turn-to-turn short circuit of the dry air reactor based on the magneto-resistance effect is characterized by comprising a magnetic field measurement probe, a stabilized voltage power supply and a data acquisition processing module, wherein the magnetic field measurement probe is arranged close to the dry air reactor, the stabilized voltage power supply and the data acquisition processing module are respectively connected with the magnetic field measurement probe, the magnetic field measurement probe adopts a Wheatstone bridge structure, the Wheatstone bridge structure comprises a first bridge arm provided with a first resistor R1, a second bridge arm provided with a second resistor R2, a third bridge arm provided with a third resistor R3, a fourth bridge arm provided with a fourth resistor R4, a voltage input end V cc and a voltage output end V 0, one end of the first bridge arm is connected with the voltage input end V cc, the other end of the third bridge arm is grounded; one end of the second bridge arm is connected with a power supply V cc, the other end of the second bridge arm is connected with one end of the fourth bridge arm, the other end of the fourth bridge arm is grounded, and the voltage output end V 0 is respectively connected between the first bridge arm and the third bridge arm and between the second bridge arm and the fourth bridge arm; the resistance values of the first resistor R1, the fourth resistor R4, the second resistor R2 and the third resistor R3 are the same, and the resistance values of adjacent resistors are opposite; the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 are all made of magneto-resistance effect materials; the magnetic field measuring probe adopts two magneto-resistance effect sensing chips, sensitive axes of the magneto-resistance effect sensing chips are arranged along an x axis and a z axis, and the magnetic field sizes of the dry type air-core reactor in the horizontal direction and the vertical direction are measured respectively.
2. The magnetoresistance effect based dry air reactor turn-to-turn short circuit magnetic field detection device according to claim 1, wherein: the data acquisition processing module comprises an A/D converter for signal acquisition, a communication module connected with the A/D converter for data transmission and a CPU single chip microcomputer connected with the communication module for completing real-time operation of magnetic field data.
3. The magnetoresistance effect based dry air reactor turn-to-turn short circuit magnetic field detection device according to claim 1, wherein: the data acquisition processing module is in wireless connection with the upper computer.
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| WO2010009761A1 (en) * | 2008-07-22 | 2010-01-28 | Abb Research Ltd | Magnetoresistive sensor arrangement for current measurement |
| CN102810381B (en) * | 2011-06-01 | 2016-08-10 | 特变电工股份有限公司 | A kind of air reactor |
| CN112904078A (en) * | 2021-01-15 | 2021-06-04 | 云南电网有限责任公司电力科学研究院 | Giant magnetoresistance effect-based reactor branch current monitoring system and method |
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| 35 kV并联电抗器匝间短路故障监测方法;王晓文;李敬;;沈阳工程学院学报(自然科学版);20170415(02);全文 * |
| Analysis of Inter-turn Short Circuit Magnetic Field of Dry-type Air-core Reactor Based on Maxwell;Dongyang Han;《2021 14th International Symposium on Computational Intelligence and Design (ISCID)》;20220120;全文 * |
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