CN211785772U - Overvoltage monitoring device for switching shunt reactor of vacuum circuit breaker - Google Patents
Overvoltage monitoring device for switching shunt reactor of vacuum circuit breaker Download PDFInfo
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- CN211785772U CN211785772U CN202020286182.4U CN202020286182U CN211785772U CN 211785772 U CN211785772 U CN 211785772U CN 202020286182 U CN202020286182 U CN 202020286182U CN 211785772 U CN211785772 U CN 211785772U
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Abstract
The embodiment of the utility model discloses vacuum circuit breaker switching paralleling reactor overvoltage monitoring device, including data acquisition module, signal conditioning module, data conversion module and backstage core processing module, the output of data acquisition module with the input of signal conditioning module is connected, the output of signal conditioning module with the input of data conversion module is connected, the data conversion module with the input of backstage core processing module is connected, the data acquisition module is used for gathering the voltage data and the current data of reactor, and transmit to the signal conditioning module and amplify and filter processing, the signal conditioning module with the signal transmission after handling to the data conversion module carries out analog-to-digital conversion after-transmitting to backstage core processing module and carries out analysis processing and display and storage; the utility model discloses can realize the on-line monitoring of vacuum circuit breaker switching shunt reactor overvoltage characteristic.
Description
Technical Field
The utility model relates to a circuit monitoring technology field especially relates to a vacuum circuit breaker switching shunt reactor overvoltage monitoring devices.
Background
In recent years, with the rapid increase of the load of the power system, the complexity of the load change is rapidly increased. In order to maintain the stability of system voltage, a parallel reactive compensation reactor is generally adopted as reactive compensation equipment for system voltage adjustment on the low-voltage side of a transformer substation in China. When the load of the power grid is light, the power frequency voltage of the power system can be limited to rise and the operation overvoltage can be limited; when the load of the power grid is heavy, all or part of the shunt reactor needs to be cut off to avoid excessive consumption of inductive reactive power of the system and maintain the stability of the voltage of the power grid.
The vacuum circuit breaker has the advantages of large breaking capacity, convenient maintenance, no pollution, suitability for frequent operation and the like, and is widely applied to a 10kV reactive compensation parallel reactor loop. With the technological progress and the improvement of the manufacturing process, the performance of the domestic 10k V vacuum circuit breaker for reactive compensation reactor operation is greatly improved. However, the system load changes frequently, and frequent operation of the shunt reactor is required to maintain the stability of the system voltage and improve the power quality. Therefore, overvoltage accidents often occur when the power grid is operated in conjunction with the parallel reactive compensation reactor.
Under a certain working condition, when the vacuum circuit breaker is switched on and connected with small inductive current loads such as a parallel reactive compensation reactor and the like, the phenomena of multiple pre-breakdown and re-ignition can be generated between the fractures of the circuit breaker, so that operation transient overvoltage with extremely high amplitude and frequency is formed, and the insulation safety of equipment in a station is seriously threatened. When an overvoltage pulse generated in a multiple pre-breakdown or restriking site propagates along a cable/bus to a reactor or a station transformer, waves are refracted and reflected due to different wave impedances. The new overvoltage pulse wave is constantly superimposed on the overvoltage wave previously propagated along the equipment winding, causing overvoltage oscillations on the equipment winding, resulting in a large difference in the amplitude and steepness of the winding overvoltage wave over a certain period of time, the oscillation frequency of the winding overvoltage wave being in a wide frequency band of several kHz to several MHz. The solid insulation of the equipment can be aged on the sites, and insulation breakdown accidents are finally caused, however, at present, no vacuum circuit breaker switching shunt reactor overvoltage monitoring device is available at home and abroad, and the overvoltage of the vacuum circuit breaker switching shunt reactor cannot be effectively monitored.
SUMMERY OF THE UTILITY MODEL
The utility model provides a vacuum circuit breaker switching paralleling reactor overvoltage monitoring devices to solve the not enough of prior art.
In order to achieve the above object, the present invention provides the following technical solutions:
in an aspect of an embodiment of the present invention, there is provided an overvoltage monitoring device for a switching shunt reactor of a vacuum circuit breaker, comprising a data acquisition module, a signal conditioning module, a data conversion module and a background core processing module, wherein an output end of the data acquisition module is connected to an input end of the signal conditioning module, an output end of the signal conditioning module is connected to an input end of the data conversion module, and the data conversion module is connected to an input end of the background core processing module;
the data acquisition module is used for acquiring voltage data and current data of the reactor and transmitting the voltage data and the current data to the signal conditioning module for amplification and filtering, and the signal conditioning module transmits the processed signals to the data conversion module for analog-to-digital conversion and then transmits the processed signals to the background core processing module for analysis and processing, display and storage.
As an optimized scheme of the utility model, the data acquisition module is including the voltage probe who is used for gathering voltage data to and the electric current pincers that are used for gathering current data.
As an optimized scheme of the utility model, signal conditioning module is including being used for carrying out the enlarging and the filter circuit handled to the data of gathering.
As a preferred scheme of the utility model, signal conditioning module is still including being used for keeping apart the sampling circuit and voltage isolation sampling circuit of sampling to voltage data and current data, current isolation sampling circuit with data transmission after voltage isolation sampling circuit handles keeps apart sampling circuit and voltage isolation sampling circuit to the current.
As a preferred aspect of the present invention, the data conversion module includes an ADC analog-to-digital converter.
As an optimized scheme of the utility model, backstage core processing module include the core treater and with touch-sensitive screen, USB memory, liquid crystal display, SD storage card and serial ports communication circuit that the core treater is connected.
As a preferred embodiment of the present invention, the signal amplifying part of the amplifying and filtering circuit employs an INA128 differential amplifier.
As a preferred scheme of the utility model, the voltage follower that current isolation sampling circuit and voltage isolation sampling circuit all adopted the op285 chip as input signal, and the low pass filter that the collection signal of voltage follower output passes through RC and constitutes filters out the higher harmonic, realizes keeping apart, buffering to front and back level circuit.
The utility model discloses an embodiment has following advantage:
the utility model discloses the vacuum circuit breaker switching paralleling reactor/condenser on-line monitoring device hardware platform of signal acquisition sensor, signal conditioning circuit, data acquisition module, data processing module has been established. The voltage signal of the secondary side of the voltage transformer of the transformer substation is attenuated to 1/100 by a voltage probe, and the current signal of the secondary side of the current transformer is transformed into a small voltage signal by current clamp. The two small voltage signals are converted into small signals which can be accepted by the data acquisition module through signal isolation, linear transformation and signal conditioning. The data acquisition module completes the data acquisition process of a small voltage signal, a low-pass filter, a voltage follower, an ADC (analog-to-digital converter) and a memory SRAM (static random access memory). An overvoltage self-adaptive tracking unit is developed in the data acquisition module, and online monitoring of overvoltage characteristics of switching shunt reactors of the vacuum circuit breakers is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a block diagram of the embodiment of the present invention;
fig. 2 is a schematic flow chart of a method according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a differential amplifier according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a power module according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a voltage follower according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention are clearly and completely described with reference to the drawings in the embodiments of the present invention, and obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.
Furthermore, the terms "long", "short", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are only for convenience of describing the present invention, but do not indicate or imply that the device or element referred to must have the specific orientation, operate in the specific orientation configuration, and thus, should not be construed as limiting the present invention.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
Example one
As shown in fig. 1, the present invention provides an aspect of the embodiment of the present invention, which provides an overvoltage monitoring device for a switching shunt reactor of a vacuum circuit breaker, comprising a data acquisition module, a signal conditioning module, a data conversion module and a background core processing module, wherein an output end of the data acquisition module is connected to an input end of the signal conditioning module, an output end of the signal conditioning module is connected to an input end of the data conversion module, and the data conversion module is connected to an input end of the background core processing module;
the data acquisition module is used for acquiring voltage data and current data of the reactor and transmitting the voltage data and the current data to the signal conditioning module for amplification and filtering, and the signal conditioning module transmits the processed signals to the data conversion module for analog-to-digital conversion and then transmits the processed signals to the background core processing module for analysis and processing, display and storage.
The data acquisition module comprises a voltage probe for acquiring voltage data and a current clamp for acquiring current data. The signal conditioning module comprises an amplifying and filtering circuit for processing the acquired data. The signal conditioning module further comprises a current isolation sampling circuit and a voltage isolation sampling circuit, wherein the current isolation sampling circuit and the voltage isolation sampling circuit are used for carrying out isolation sampling on voltage data and current data, and the data processed by the current isolation sampling circuit and the voltage isolation sampling circuit are transmitted to the current isolation sampling circuit and the voltage isolation sampling circuit.
The data conversion module comprises an ADC analog-to-digital converter.
The background core processing module comprises a core processor, and a touch screen, a USB memory, a liquid crystal display screen, an SD memory card and a serial port communication circuit which are connected with the core processor.
The signal amplification part of the amplifying and filtering circuit adopts an INA128 differential amplifier. The current isolation sampling circuit and the voltage isolation sampling circuit both adopt an op285 chip as a voltage follower of an input signal, and an acquisition signal output by the voltage follower is filtered by a low-pass filter consisting of RC to remove higher harmonics, so that the front-stage circuit and the rear-stage circuit are isolated and buffered.
In the present embodiment, the overvoltage and the current are converted into a low voltage with a secondary side of 100V by PT and CT, and a small current with a secondary side of 5A/1A and a low voltage of 100V is converted into a small voltage signal by a voltage signal attenuation probe, and the 5A current signal is a small voltage signal with a mutual inductance of 400mV by the current. The small voltage signals are converted into small signals which can be accepted by the data acquisition module through signal isolation, linear transformation W and signal conditioning. The design adopts an INA128 differential amplifier with adjustable gain, the internal circuit of the chip is shown in figure 3, the amplifier circuit amplifies the signal obtained by the sensor, the accurate analysis, the change and the protection of the rear end circuit are convenient, and the direct burning of the acquisition module due to the overlarge signal of the front end is prevented.
In order to improve the reliability and the measurement precision of the measurement system, the signal isolation is adopted to cut off the circulation of the ground wire, and the interference of common-mode voltage on the monitoring system is restrained. And a special power supply module independently supplies power for the conditioning circuit, so that the power supply stability is ensured, and a specific circuit is shown in fig. 4.
16 sampling signals are input to the voltage follower through the panel, and an op285 chip is selected as the voltage follower of the input signal in the design, so that the isolation and buffering effects on front and rear-stage circuits are realized. The collected signal output by the voltage follower passes through a low-pass filter consisting of an RC (resistor-capacitor) to filter out higher harmonics, and a circuit diagram is shown in figure 5. The PESD24L2BT chip is a low-capacitance bidirectional protection circuit.
The signal output by the low-pass filter is input to an ADC, and the ADC adopts an AD 7656 chip.
The sampling frequency self-adaptive module collects voltage and current signals from a mutual inductor and converts the input electricity into square waves by adopting a second-order active low-pass filter and a zero-crossing comparator to be input into a sampling frequency controller of the FPGA; the sampling frequency controller measures the fundamental wave period and frequency of the measured electric signal in real time through a 100MHz clock, and the measurement error of the fundamental wave period is controlled within +/-200 ns.
The design selects a TL331 chip as a zero-crossing comparator, the input voltage range of the TL331 is 0V-Vcc-1.5V, and the working power supply is 2V-36V, and the method is usually used for comparing a single signal with a reference value or two signals.
As shown in fig. 2, the utility model also provides a vacuum circuit breaker switching shunt reactor overvoltage monitoring method, including following step:
100, acquiring load side three-phase currents Ia, Ib and Ic, acquiring load side three-phase voltages Ua, Ub and Uc, and acquiring power supply side three-phase voltages UA, UB and UC;
step 200, disconnecting a vacuum switch TB of the vacuum circuit breaker;
step 300, calculating the transient recovery voltage TRV of the vacuum circuit breaker fracture;
step 400, when the TRV is larger than the medium recovery strength, closing a vacuum switch TB, calculating a high-frequency current i3, performing step 500, when the TRV is not larger than the medium recovery strength, judging whether the medium is broken down, finishing when the medium is broken down, and otherwise, returning to the step 300;
and 500, judging whether i3 is equal to 0, judging whether di3/dt is smaller than dir/dt when i3 is equal to 0, if so, disconnecting i3 and returning to step 200, otherwise, judging whether i3 is extinguished, if so, ending, and otherwise, returning to step 400.
The foregoing description of the embodiments has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same elements or features may also vary in many respects. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
Example embodiments are provided so that this disclosure will be thorough and will fully convey the scope to those skilled in the art. Numerous details are set forth, such as examples of specific parts, devices, and methods, in order to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In certain example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.
The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. 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. The terms "comprises" and "comprising" are intended to be inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed and illustrated, unless explicitly indicated as an order of performance. It should also be understood that additional or alternative steps may be employed.
When an element or layer is referred to as being "on" … … "," engaged with "… …", "connected to" or "coupled to" another element or layer, it can be directly on, engaged with, connected to or coupled to the other element or layer, or intervening elements or layers may also be present. In contrast, when an element or layer is referred to as being "directly on … …," "directly engaged with … …," "directly connected to" or "directly coupled to" another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship of elements should be interpreted in a similar manner (e.g., "between … …" and "directly between … …", "adjacent" and "directly adjacent", etc.). As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region or section from another element, component, region or section. Unless clearly indicated by the context, use of terms such as the terms "first," "second," and other numerical values herein does not imply a sequence or order. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
Spatially relative terms, such as "inner," "outer," "below," "… …," "lower," "above," "upper," and the like, may be used herein for ease of description to describe a relationship between one element or feature and one or more other elements or features as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below … …" can encompass both an orientation of facing upward and downward. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted.
Claims (8)
1. The overvoltage monitoring device for the switching shunt reactor of the vacuum circuit breaker is characterized by comprising a data acquisition module, a signal conditioning module, a data conversion module and a background core processing module, wherein the output end of the data acquisition module is connected with the input end of the signal conditioning module, the output end of the signal conditioning module is connected with the input end of the data conversion module, and the data conversion module is connected with the input end of the background core processing module;
the data acquisition module is used for acquiring voltage data and current data of the reactor and transmitting the voltage data and the current data to the signal conditioning module for amplification and filtering, and the signal conditioning module transmits the processed signals to the data conversion module for analog-to-digital conversion and then transmits the processed signals to the background core processing module for analysis and processing, display and storage.
2. The vacuum circuit breaker switching shunt reactor overvoltage monitoring device according to claim 1, wherein the data acquisition module comprises a voltage probe for acquiring voltage data and a current clamp for acquiring current data.
3. The vacuum circuit breaker switching shunt reactor overvoltage monitoring device according to claim 1, wherein the signal conditioning module comprises an amplifying and filtering circuit for processing collected data.
4. The overvoltage monitoring device for the switching shunt reactor of the vacuum circuit breaker according to claim 3, wherein the signal conditioning module further comprises a current isolation sampling circuit and a voltage isolation sampling circuit for performing isolation sampling on the voltage data and the current data, and data processed by the current isolation sampling circuit and the voltage isolation sampling circuit are transmitted to the current isolation sampling circuit and the voltage isolation sampling circuit.
5. The vacuum circuit breaker switching shunt reactor overvoltage monitoring device according to claim 2, wherein the data conversion module comprises an ADC analog-to-digital converter.
6. The overvoltage monitoring device for the switching shunt reactor of the vacuum circuit breaker according to claim 1, wherein the background core processing module comprises a core processor, and a touch screen, a USB memory, a liquid crystal display screen, an SD memory card and a serial port communication circuit which are connected with the core processor.
7. The overvoltage monitoring device for the switching shunt reactor of the vacuum circuit breaker according to claim 1, wherein the signal amplifying part of the amplifying and filtering circuit adopts an INA128 differential amplifier.
8. The overvoltage monitoring device for the switching shunt reactor of the vacuum circuit breaker according to claim 4, wherein the current isolation sampling circuit and the voltage isolation sampling circuit both adopt an op285 chip as a voltage follower of an input signal, and an acquisition signal output by the voltage follower is filtered by a low-pass filter consisting of RC to remove higher harmonics, so that the front-stage circuit and the rear-stage circuit are isolated and buffered.
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| CN202020286182.4U CN211785772U (en) | 2020-03-10 | 2020-03-10 | Overvoltage monitoring device for switching shunt reactor of vacuum circuit breaker |
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| CN202020286182.4U CN211785772U (en) | 2020-03-10 | 2020-03-10 | Overvoltage monitoring device for switching shunt reactor of vacuum circuit breaker |
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