CN115524637A - Dry-type air-core reactor on-line monitoring device and detection method - Google Patents

Abstract

The invention provides a dry-type air-core reactor on-line monitoring device and a detection method, comprising the following steps: the system comprises a data acquisition module and a background control module; the data acquisition module comprises an energy acquisition CT, a Rogowski coil and a local acquisition board and is used for acquiring the current of each star frame arm of the dry-type air reactor and calculating a corresponding split-phase lateral interpolation algorithm matrix according to the acquired current of each star frame arm; the background control module comprises a desktop computer module and a background control panel module, and is used for identifying and judging turn-to-turn short circuit and broken line faults of the reactor according to the data of all the star frame arms of the air reactor transmitted by the data acquisition module and the corresponding split phase horizontal interpolation algorithm matrix, and sending out fault signals and giving an alarm after the faults are identified so as to timely control the turn-to-turn circuit and the broken line faults of the reactor, and inquiring the fault data at the background of the device so as to roughly confirm the position of the turn-to-turn short circuit or the broken line faults.

Description

Dry-type air-core reactor on-line monitoring device and detection method

Technical Field

The invention belongs to the field of power system protection, relates to the field of reactor fault protection, and particularly relates to a novel dry-type air-core reactor turn-to-turn short circuit and disconnection fault online monitoring and identifying device and a novel dry-type air-core reactor turn-to-turn short circuit and disconnection fault online monitoring and identifying method.

Background

In terms of development at the present stage, online monitoring devices in the industry can be roughly classified into three types according to monitoring contents of the online monitoring devices, namely dry-type air-core reactor dynamic monitoring devices based on temperature rise, magnetic field detection and current characteristic measurement. The online monitoring device based on temperature rise has high influence on the service life of a product, is complex to implement and has high popularization difficulty; the online monitoring device based on magnetic field detection can not directly reflect the change of the fault parameters of the product and is easily influenced by the electromagnetic interference of a transformer substation; the current characteristic measurement-based online monitoring device is low in detection sensitivity and low in fault identification applicability for broken lines and the like which have little influence on loss.

The on-line monitoring device belongs to an on-line monitoring device based on current characteristic measurement, but a more superior current acquisition scheme is selected, the number of current acquisition points is increased, a fault judgment and identification algorithm is optimized, and the sensitivity of the device is improved.

Disclosure of Invention

The invention provides an online monitoring device and an online monitoring method for a dry-type air-core reactor, which are used for making up the defects of the prior art.

The invention is realized by the following technical scheme: an on-line monitoring device for a dry-type air-core reactor comprises: the data acquisition module and the background control module are connected through wireless communication;

the data acquisition module comprises an energy acquisition CT, a Rogowski coil and an on-site acquisition board, wherein the energy acquisition CT is sleeved on an incoming line busbar of the reactor, the Rogowski coil is sleeved on a star frame arm of the air reactor and used for acquiring the current of each star frame arm of the dry-type air reactor, and a corresponding split-phase lateral interpolation algorithm matrix is calculated according to the acquired star frame arm current;

the local acquisition board comprises a board card, a current integrator and an amplifying circuit module, wherein the current integrator and the amplifying circuit module are connected with a main chip module through a digital-to-analog conversion chip module, and the main chip module is connected with a ZigBee wireless communication module and then transmitted to a background control board module through wireless communication;

the background control module comprises a desktop computer module and a background control panel module, and is used for identifying and judging turn-to-turn short circuit and broken line faults of the reactor according to the data of each star frame arm of the air reactor transmitted by the data acquisition module and the corresponding split phase horizontal interpolation algorithm matrix, and sending out fault signals and alarming in time after the faults are identified so as to control the turn-to-turn circuit and broken line faults of the reactor in time;

the background control panel module comprises a background control panel and is used for judging and identifying the fault of the reactor, sending a fault signal and giving an alarm.

Furthermore, the Rogowski coil is fixed on the star arm of the air reactor through a Rogowski coil mounting shell, the Rogowski coil mounting shell comprises a mounting shell and a fixing bolt, and the Rogowski coil is clamped in a shell groove.

The board card of the on-site acquisition board provides power input through the energy acquisition CT matched power module, and the air core reactor current signal acquired by the Rogowski coil enters the board card from the lower terminal.

The local acquisition board is fixed on an insulation board at the bottom of the control cabinet through a bolt together with a matched power module of the energy acquisition CT through a mounting hole, and the insulation board is fixed in the control cabinet through the bolt.

The desktop computer of the background control panel module comprises 7 pages, namely a main page, a constant value setting page, a data chart page, a current chart page, a data filing page, an SOE inquiry page and a contact page

The invention also provides a detection method of the dry-type air-core reactor on-line monitoring device, which is characterized by comprising the following steps: the method comprises the following steps:

s1, sleeving a Rogowski coil on a star frame arm of a dry type air-core reactor through a Rogowski coil mounting shell, and collecting current of each star frame arm of the dry type air-core reactor;

s2, enabling current signals acquired by the Rogowski coil to enter a local acquisition board, then performing primary signal reduction through a current integrator and an amplifying circuit module, performing digital-to-analog conversion through a digital-to-analog conversion chip module, then entering a main chip module, processing data and calculating a corresponding split-phase cross-interpolation algorithm matrix;

s3: and a background control board of the background control module receives the split-phase horizontal interpolation algorithm matrix obtained in the step S2 from the data acquisition module through the ZigBee wireless communication module, and then conveys the split-phase horizontal interpolation algorithm matrix into the main chip for identifying and judging turn-to-turn short circuit and broken line faults of the electric reactor.

Further, 8 star arm frames are arranged in the step S1, and in the step S2, the process of calculating the corresponding split phase horizontal interpolation algorithm matrix is as follows:

and measuring current data of eight star arm in real time, and recording the current data as I1, I2, I3. For the eight current data, comparing every two current data with each other to obtain a real-time split-phase horizontal interpolation algorithm matrix Q [ i ] [ j ] for the current data, namely:

q [ i ] [ j ] = Ii/Ij (i ≦ j and i ≦ 8, j ≦ 8)

Further, the process of identifying and judging turn-to-turn short circuit and disconnection fault of the reactor in S3 is as follows:

after the background control board receives two split-phase horizontal interpolation algorithm matrixes Q1[ i ] [ j ] and Q2[ i ] [ j ] separated by a fault judgment time limit T, the change rate D [ i ] [ j ] of the two matrixes is calculated item by item, namely:

d [ i ] [ j ] = (Q2 [ i ] [ j ] -Q1[ i ] [ j ])/Q1 [ i ] [ j ] (i ≦ j and i ≦ 8, j ≦ 8)

If a certain change rate exceeds a fault identification fixed value D, namely D [ i ] [ j ] > D exists, the device judges that the reactor has turn-to-turn short circuit or disconnection fault.

Compared with the prior art, the invention has the advantages that:

1. the invention can dynamically monitor the current of each star frame arm of the dry type air reactor with four star arms, six star arms and eight star arms in real time, and display the current data in the background of the device in real time; the normal working state of the reactor and the turn-to-turn short circuit or disconnection fault state can be identified, and a fault signal and alarm information are sent out; fault data can be inquired at the background of the device, the position of turn-to-turn short circuit or disconnection fault is roughly confirmed, and the turn-to-turn short circuit or disconnection fault of the dry type air reactor can be conveniently checked; the monitoring system is wirelessly connected with the background control part, so that remote monitoring can be realized, and the limitations of fields and environments are avoided;

2. the invention belongs to an on-line monitoring device based on current characteristic measurement, but the invention selects a more superior current acquisition scheme, increases the number of current acquisition points, optimizes a fault judgment and identification algorithm and improves the sensitivity of the device.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a 3D model of a Rogowski coil housing;

FIG. 2 is a view of a panel configuration for in situ acquisition;

FIG. 3 is a hole pattern of an insulating plate at the bottom of a control cabinet;

FIG. 4 is a diagram of a control cabinet;

FIG. 5 is a background interface home page;

FIG. 6 is a background interface constant value setup page;

FIG. 7 is a background interface data chart page;

FIG. 8 is a background interface current chart page;

FIG. 9 is a background interface data archiving page;

FIG. 10 is a diagram of a background control board;

FIG. 11 is a 3D model of a backstage control panel barrier strip;

FIG. 12 is a system diagram of the on-line monitoring device for the dry air-core reactor;

FIG. 13 is a schematic diagram of an in-situ acquisition plate integral amplification circuit;

FIG. 14 is a schematic diagram of a wireless transmission portion of the in-situ acquisition board;

FIG. 15 shows a circuit for outputting fault signals of a back-end control board;

in the figure, 1, a Rogowski coil mounting shell, 2, a mounting shell, 3, a fixing bolt, 4 and a shell groove.

Detailed Description

The related art not described below can be used or used as a reference for the prior art.

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in 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 obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Example 1

The invention provides an on-line monitoring device for a dry-type air reactor, which mainly aims at identifying turn-to-turn short circuit and disconnection faults of the dry-type air reactor. According to the structural characteristics of the reactor and the different functions of the two modules, the two modules are separately installed on the site of the reactor and are connected through wireless communication. The functions of these two modules in the present air reactance on-line monitoring device and the installation environment at the reactor site are described in detail below.

The data acquisition module of the air reactor on-line monitoring device has the main functions of acquiring the current of each star frame arm of the dry-type air reactor and calculating a corresponding split-phase horizontal interpolation algorithm matrix according to the acquired current of each star frame arm. The data acquisition module comprises three components, namely an energy acquisition CT, a Rogowski coil and an on-site acquisition board. The energy acquisition CT and the Rogowski coil can be selected according to the model of the reactor and directly purchased on the market, and the local acquisition board is a PCB board card and needs to be loaded with an ARM program for use.

When the data acquisition module is installed on site, the energy-taking CT is directly sleeved on the wire-inlet busbar of the reactor, so that electromotive force can be induced according to the current on the busbar, and then the electromotive force is rectified by a matched power supply module to supply power to the on-site acquisition board; the Rogowski coil is an initial acquisition unit of the current data of the star frame arm of the reactor, and needs to be sleeved on the star frame arm of the air reactor.

As shown in fig. 1, a rogowski coil mounting shell 1 is used for fixing the rogowski coil, the shell comprises a mounting shell 2 and 7 fixing bolts 3, both of which are made of high-temperature-resistant nylon insulating materials, the rogowski coil is firstly clamped in a shell groove 4 during mounting, and the shell is fixed on a star arm of the air reactor by the 7 fixing bolts, so that the mounting and fixing of the rogowski coil are realized. The in-situ acquisition board is a main component of the data acquisition module, the external dimension of the in-situ acquisition board is 168mm 142mm, and the structure of the in-situ acquisition board is shown in figure 2. The integrated circuit board is provided with +12V power input by an energy acquisition CT matched power module, current signals of the air reactor acquired by the Rogowski coil enter the integrated circuit board from a 16P terminal below the integrated circuit board, and the terminal can simultaneously receive the current signals acquired by 8 Rogowski coils at most and corresponds to 8 star arms of the air reactor. After entering the local acquisition board, the current signal is subjected to primary signal reduction through the current integrator and the amplifying circuit module, then subjected to digital-to-analog conversion through the digital-to-analog conversion chip module and then enters the main chip module, data is processed according to ARM program logic carried in the main chip module, a corresponding split-phase horizontal interpolation algorithm matrix is calculated, and then a result is transmitted to the ZigBee wireless communication module and is transmitted to the background control board module through wireless communication. In this example, the digital-to-analog conversion chip module uses the digital-to-analog conversion chip AD7606, and the main chip module uses the main chip STM32F407. The local acquisition board is fixed on an insulation board at the bottom of the control cabinet shown in figure 3 through 6 mounting holes and a matched power module of the energy acquisition CT together through nylon bolts, a dotted frame in the figure is the external outline of the power module and the local acquisition board, and the insulation board is fixed in the control cabinet shown in figure 4 through bolts.

In this embodiment, a schematic diagram of an in-situ acquisition board integral amplification circuit and a schematic diagram of a wireless transmission part of an in-situ acquisition board are shown in fig. 13 and 14, and a fault signal output circuit of a background control board is shown in fig. 15.

The background control module of the air reactor on-line monitoring device has the main functions of identifying and judging turn-to-turn short circuit and broken line faults of the reactor according to the data of all the star frame arms of the air reactor transmitted by the data acquisition module and the corresponding split phase horizontal interpolation algorithm matrix, and sending out fault signals and alarming in time after the faults are identified so as to control the turn-to-turn circuit and broken line faults of the reactor in time. The module mainly comprises a desktop computer module and a background control board module, wherein the desktop computer can buy a proper model on the market and carry a background interface, and the background control board is a PCB board card as well as a local acquisition board and also needs to carry an ARM program for use.

Regarding the background interface carried by the desktop computer of the background control module, the background interface comprises 7 pages, namely a main page, a fixed value setting page, a data chart page, a current chart page, a data archiving page, an SOE inquiry page and a contact page. Part of the key page layout is shown in fig. 5-9. The main page is used for displaying real-time current data of each star frame arm of three-phase reactors of a set of reactor equipment and total current data flowing through the reactors, displaying the communication states of the background management board and the local acquisition board on the side edge, and indicating whether the reactors are in fault or not. And the fixed value setting page is used for displaying and issuing fixed values of current calculation of all star frame arms of the reactor and fault judgment of the reactor. And the data chart page is used for displaying a split phase horizontal interpolation algorithm matrix obtained by calculation based on real-time current data of each planet carrier arm, and comprises the display of the real-time matrix and the query of a historical fault matrix. The current chart page is used for inquiring historical current data of each star arm of a certain phase reactor in a certain time period. The data filing page is used for inquiring the historical fault matrix record of a certain phase reactor in a certain time period. The SOE inquiry page is used for inquiring the SOE record and displaying the running state of the three-phase channel. The contact page is used for displaying relevant information such as contact information and the like, so that the communication between the user and the developer is facilitated.

Regarding the background control board of the background control module, the board card is a key component for judging and identifying the fault of the reactor, sending a fault signal and giving an alarm, the overall dimension of the board card is 130mm × 70mm, and the structure of the board card is shown in fig. 10. And after the background control board receives the current data of each star frame arm of the electric reactor and the corresponding split phase horizontal interpolation algorithm matrix from the data acquisition module through the ZigBee wireless communication module, the current data and the corresponding split phase horizontal interpolation algorithm matrix are conveyed into the main chip STM32F407 to identify and judge turn-to-turn short circuit and broken wire faults of the electric reactor, and if the faults of the electric reactor are identified, the fault signal output module is controlled to send out fault signals, and meanwhile, the buzzer is controlled to send out alarms. The console back control board is fixed in the host case of the desktop computer through a barrier strip as shown in fig. 11, and uses a data line to realize data transmission with the host of the desktop computer through an RS-232 interface, and simultaneously obtains power input through the interface.

Example 2

In order to make the objects and features of the present invention more obvious and understandable, the method and principle of the present online monitoring device for identifying the turn-to-turn short circuit or disconnection fault of the dry-type air-core reactor are briefly described below, and the fault identification process thereof is briefly described.

In the use process of a dry-type air-core reactor, if the reactor has no abnormal condition, the distribution proportion of the total current flowing through the reactor in each star arm is constant, namely the proportion of the current flowing through each star arm is constant under the ideal condition, when the reactor has turn-to-turn short circuit or disconnection fault, the current proportion distributed to the star arm current corresponding to the fault point is necessarily changed, and the proportion of the current of each star arm of the reactor is changed.

Therefore, the online monitoring device processes the acquired current data of each star frame arm of the air reactor, calculates a corresponding split phase horizontal interpolation algorithm matrix as a main basis for fault judgment and identification, and adopts the matrix calculation process as follows. For an eight-star-arm dry-type air-core reactor, the on-line monitoring device can measure current data of eight star arm in real time and record the current data as I1, I2, I3. For the eight current data, comparing every two current data with each other to obtain a real-time split-phase horizontal interpolation algorithm matrix Q [ i ] [ j ] for the current data, namely:

q [ i ] [ j ] = Ii/Ij (i ≦ j and i ≦ 8, j ≦ 8)

When the device is used, the current of each star frame arm of the dry type air reactor with the four star arms, the six star arms and the eight star arms can be dynamically monitored in real time, and the current data are displayed in a background of the device in real time.

If the dry-type air reactor works normally and stably, all items in the matrix are constant values, turn-to-turn short circuit or disconnection faults occur to the air reactors, the ratio of currents flowing through all star arms of the air reactors changes, certain items in the obtained split-phase horizontal interpolation algorithm matrix change accordingly, and the online monitoring device identifies the reactor faults.

According to the above description, the fault identification process of the dry-type air reactor on-line monitoring device can be divided into two stages, the first stage is to collect and calculate the current of each star frame ARM of the air reactor and calculate the corresponding split-phase horizontal interpolation algorithm matrix, the stage is completed in a data collection module in device hardware, and the calculation process depends on an ARM program in a local collection board.

The ARM program calculation process comprises the following steps: for a current data signal entering a main chip, the current data signal is firstly transferred into a buffer area, then the current data of the star frame arm is calculated, the calculated current data of the star frame arm is calibrated, so that real-time accurate current flowing through each star frame arm of the reactor is obtained, and finally a split-phase cross-interpolation algorithm matrix is calculated according to the real-time accurate current. Through the calculation cycle, a group of real-time currents of all star frame arms of the reactor and split phase lateral interpolation algorithm matrixes corresponding to the real-time currents can be obtained.

The second stage is to identify and judge whether turn-to-turn short circuit or disconnection fault occurs in the reactor according to the obtained real-time current and a split phase horizontal interpolation algorithm matrix corresponding to the real-time current, the stage is finished by a background control module, the identification and judgment process depends on a background control panel ARM program, and the ARM program identification and judgment logic is as follows: after the master chip of the background control board receives two split-phase horizontal interpolation algorithm matrixes Q1[ i ] [ j ] and Q2[ i ] [ j ] separated by a fault judgment time limit T, the change rate D [ i ] [ j ] of the two matrixes is calculated item by item, namely:

d [ i ] [ j ] = (Q2 [ i ] [ j ] -Q1[ i ] [ j ])/Q1 [ i ] [ j ] (i ≦ j and i ≦ 8, j ≦ 8)

If a certain change rate exceeds a fault identification fixed value D, namely D [ i ] [ j ] > D exists, the device judges that the reactor has turn-to-turn short circuit or disconnection fault. The logic involves two fixed values of a fault judgment time limit T and a fault identification fixed value D, wherein the fault judgment time limit T indicates that the current collection time interval T of the star frame arm corresponding to the two split-phase horizontal interpolation algorithm matrixes for comparison is T. And the fault identification fixed value D shows that when a certain fluctuation range in the two split-phase horizontal interpolation algorithm matrixes for comparison exceeds the fixed value D, the device judges that the reactor has a fault, and the background sends out a fault signal and gives an alarm.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

Claims (8)

1. An on-line monitoring device for a dry-type air-core reactor comprises: data acquisition module, backstage control module, according to acquisition module, backstage control module through wireless communication connection, its characterized in that:

the data acquisition module comprises an energy acquisition CT, a Rogowski coil and an on-site acquisition board, wherein the energy acquisition CT is sleeved on an incoming line busbar of the reactor, the Rogowski coil is sleeved on a star frame arm of the air reactor and used for acquiring the current of each star frame arm of the dry-type air reactor, and a corresponding split-phase lateral interpolation algorithm matrix is calculated according to the acquired star frame arm current;

the local acquisition board comprises a clamping board, a current integrator and an amplifying circuit module, wherein the current integrator and the amplifying circuit module are connected with a main chip module through a digital-to-analog conversion chip module, and the main chip module is connected with a ZigBee wireless communication module and then transmitted to a background control board module through wireless communication;

the background control module comprises a desktop computer module and a background control panel module, and is used for identifying and judging turn-to-turn short circuit and broken line faults of the reactor according to the data of all star arms of the air reactor transmitted by the data acquisition module and a corresponding split phase horizontal interpolation algorithm matrix, and sending fault signals and alarming in time after the faults are identified so as to control the turn-to-turn circuit and broken line faults of the reactor in time;

the background control panel module comprises a background control panel and is used for judging and identifying the fault of the reactor, sending a fault signal and giving an alarm.

2. The dry-type air-core reactor on-line monitoring device according to claim 1, characterized in that: the Rogowski coil is fixed on a star frame arm of the air reactor through a Rogowski coil mounting shell (1), the Rogowski coil mounting shell (1) comprises a mounting shell (2) and a fixing bolt (3), and the Rogowski coil is clamped in a shell groove (4).

3. The dry-type air-core reactor on-line monitoring device according to claim 1, characterized in that: the board card of the on-site acquisition board provides power input through the energy taking CT matched with the power module, and the air reactor current signal acquired by the Rogowski coil enters the board card from the lower terminal.

4. The dry-type air-core reactor on-line monitoring device according to claim 1, characterized in that: the local acquisition board is fixed on an insulating board at the bottom of the control cabinet through a mounting hole and a matched power module of the energy acquisition CT together through bolts, and the insulating board is fixed in the control cabinet through bolts.

5. The dry-type air-core reactor on-line monitoring device according to claim 1, characterized in that: the desktop computer of the background control panel module comprises 7 pages, namely a main page, a fixed value setting page, a data chart page, a current chart page, a data filing page, an SOE inquiry page and a contact page.

6. The detection method of the dry-type air-core reactor on-line monitoring device according to any one of claims 1 to 4, characterized in that: the method comprises the following steps:

s1, sleeving a Rogowski coil on a star frame arm of a dry type air reactor through a Rogowski coil mounting shell, and collecting current of each star frame arm of the dry type air reactor;

s2, after entering a local acquisition board, current signals acquired by the Rogowski coil are subjected to primary signal reduction through a current integrator and an amplifying circuit module, then subjected to digital-to-analog conversion through a digital-to-analog conversion chip module and then enter a main chip module, and data are processed and corresponding split-phase transverse interpolation algorithm matrixes are calculated;

s3: and a background control board of the background control module receives the split-phase horizontal interpolation algorithm matrix obtained in the step S2 from the data acquisition module through the ZigBee wireless communication module, and then conveys the split-phase horizontal interpolation algorithm matrix into the main chip for identifying and judging turn-to-turn short circuit and broken line faults of the electric reactor.

7. The detection method of the dry-type air-core reactor on-line monitoring device according to claim 6, characterized in that: in S1, 8 star arm frames are arranged, and in S2, the corresponding split phase horizontal interpolation algorithm matrix calculation process is as follows:

and measuring current data of eight star arm in real time, and recording the current data as I1, I2, I3.

8. For the eight current data, comparing every two current data with each other to obtain a real-time split-phase horizontal interpolation algorithm matrix Q [ i ] [ j ] for the current data, namely:

q [ i ] [ j ] = Ii/Ij (i ≦ j and i ≦ 8, j ≦ 8)

The detection method for the dry-type air-core reactor on-line monitoring device according to claim 6, characterized in that: the identification and judgment process of the turn-to-turn short circuit and disconnection fault of the reactor in the S3 is as follows:

after the background control board receives two split phase horizontal interpolation algorithm matrixes Q1[ i ] [ j ] and Q2[ i ] [ j ] separated by a fault judgment time limit T, the change rate D [ i ] [ j ] of the two matrixes is calculated item by item, namely:

d [ i ] [ j ] = (Q2 [ i ] [ j ] -Q1[ i ] [ j ])/Q1 [ i ] [ j ] (i ≦ j and i ≦ 8, j ≦ 8)

If a certain change rate exceeds a fault identification fixed value D, namely D [ i ] [ j ] > D exists, the device judges that the reactor has turn-to-turn short circuit or disconnection fault.

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