CN215894735U - Direct current magnetic bias current measuring system - Google Patents
Direct current magnetic bias current measuring system Download PDFInfo
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- CN215894735U CN215894735U CN202121654689.1U CN202121654689U CN215894735U CN 215894735 U CN215894735 U CN 215894735U CN 202121654689 U CN202121654689 U CN 202121654689U CN 215894735 U CN215894735 U CN 215894735U
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Abstract
The utility model relates to the technical field of power system grounding safety, and discloses a direct current magnetic bias current measuring system which can completely record the current waveform of a neutral point of a transformer and avoid the current of the neutral point from being distorted. The direct current magnetic bias current measuring system comprises a flexible current clamp, one end of the flexible current clamp is clamped with a neutral point grounding cable of the transformer, and a gear adjusting module is configured for adjusting the measuring range; the data record appearance is connected with the other end of flexible current pincers for the data that the record detected specifically includes: the data input module controls the amplitude of the detected data within a preset amplitude by using the attenuation probe and records the data; the sampling parameter setting module is used for setting the sampling frequency to be a preset sampling frequency and carrying out channel circulation or channel selection operation; the analog-to-digital conversion module is used for converting the analog signal into a digital signal; the storage module is used for storing the digital signal; and the graphic display module is used for converting the digital signal into a waveform diagram.
Description
Technical Field
The utility model relates to the technical field of grounding safety of power systems, in particular to a direct-current magnetic bias current measuring system.
Background
With the development of an electric power system, alternating current and direct current transmission loads gradually rise, direct current enters a main transformer from a neutral point of the main transformer, and the phenomenon that the normal operation of the main transformer is influenced is more and more obvious. The direct current magnetic biasing phenomenon causes the direct current component value of a main transformer neutral point to be overlarge, so that the noise and vibration conditions of a main transformer body are aggravated, and the hidden troubles of heating and insulation aging of the main transformer are increased. Therefore, it is very necessary to measure the neutral point dc component of the main transformer to ensure that the main transformer operates under normal operating conditions.
However, the sampling frequency of the existing transformer neutral point dc magnetic bias current is mostly 1Hz, that is, one sample is acquired every 1 second, and actually, there are not only pure dc components in the transformer neutral point, but also high-frequency harmonic components greater than 1Hz, and 50Hz unbalanced current flowing through the neutral point under the condition of three-phase load imbalance, so that waveform distortion is caused when the transformer neutral point current is acquired by using the 1Hz acquisition frequency, and the information of the neutral point current cannot be completely recorded.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the embodiment of the utility model is as follows: the direct current magnetic bias current measuring system is provided, the current waveform of the neutral point of the transformer is completely recorded, and the neutral point current is prevented from being distorted.
In order to solve the above technical problem, an embodiment of the present invention provides a dc bias current measurement system, including:
one end of the flexible current clamp is clamped with the neutral point grounding cable of the transformer; the flexible current clamp is provided with a gear adjusting module for adjusting the measuring range;
the data recorder is connected with the other end of the flexible current clamp and used for recording data detected by the flexible current clamp;
the data recorder specifically comprises:
one end of the data input module is connected with the other end of the flexible current clamp, the amplitude of the data detected by the flexible current clamp is controlled within a preset amplitude by using an attenuation probe, and the data is recorded;
a sampling parameter setting module, one end of which is connected with the other end of the data input module, and is used for setting the sampling frequency to be a preset sampling frequency and carrying out channel circulation or channel selection operation;
one end of the analog-to-digital conversion module is connected with the other end of the sampling parameter setting module and is used for converting an analog signal into a digital signal;
one end of the storage module is connected with the other end of the analog-to-digital conversion module and is used for storing the digital signal;
and one end of the graphic display module is connected with the other end of the storage module and is used for converting the digital signal into a oscillogram.
As a preferred scheme, the measuring range of the flexible current clamp specifically includes:
inputting a measuring range: alternating current or direct current of ± 200A;
outputting a measuring range: direct current of ± 20 mA.
Preferably, the preset sampling frequency is 100 KHz.
As a preferred scheme, the data recorder further comprises a wireless communication module, one end of which is connected with the other end of the graphic display module, and is used for establishing wireless communication connection with the user terminal equipment and transmitting the oscillogram to the user terminal equipment.
As a preferred scheme, the data recorder further comprises a wired communication module, one end of which is connected with the other end of the graphic display module, and is used for establishing wired communication connection with the user terminal device and transmitting the oscillogram to the user terminal device.
Compared with the prior art, the direct current bias current measuring system provided by the embodiment of the utility model has the beneficial effects that: the data recorder is provided with a sampling parameter setting module, can set sampling frequency, completely records the current change rule of the neutral point of the transformer, ensures the integrity of the direct-current magnetic bias current analysis data of the transformer, provides a plurality of measurable ranges by the flexible current clamp, can switch the corresponding ranges according to the current size of the neutral point of the transformer, and improves the applicability.
Drawings
In order to more clearly illustrate the technical features of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is apparent that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on the drawings without inventive labor.
FIG. 1 is a schematic structural diagram of a preferred embodiment of a DC bias current measurement system provided by the present invention;
fig. 2 is a schematic structural diagram of a preferred embodiment of a data recorder provided by the present invention.
Detailed Description
In order to clearly understand the technical features, objects and effects of the present invention, the following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the utility model, but are not intended to limit the scope of the utility model. Other embodiments, which can be derived by those skilled in the art from the embodiments of the present invention without inventive step, shall fall within the scope of the present invention.
In the description of the present invention, it should be understood that the numbers themselves, such as "first", "second", etc., are used only for distinguishing the described objects, do not have a sequential or technical meaning, and cannot be understood as defining or implying the importance of the described objects.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Fig. 1 is a schematic structural diagram of a dc bias current measurement system according to a preferred embodiment of the present invention.
As shown in fig. 1, the dc bias current measuring system includes:
one end of the flexible current clamp 1 is clamped with a neutral point grounding cable of the transformer; the flexible current clamp 1 is provided with a gear adjusting module for adjusting the measuring range;
and the data recorder 2 is connected with the other end of the flexible current clamp 1 and is used for recording data detected by the flexible current clamp 1.
A schematic structural diagram of a preferred embodiment of the data recorder 2 is shown in fig. 2, and specifically includes:
one end of the data input module 21 is connected with the other end of the flexible current clamp 1, the amplitude of the data detected by the flexible current clamp 1 is controlled within a preset amplitude by using an attenuation probe, and the data is recorded; wherein the preset amplitude is +/-10V;
a sampling parameter setting module 22, one end of which is connected to the other end of the data input module 21, and is configured to set a sampling frequency to a preset sampling frequency and perform a channel circulation or channel selection operation;
an analog-to-digital conversion module 23, one end of which is connected to the other end of the sampling parameter setting module 22, and is configured to convert an analog signal into a digital signal;
a storage module 24, one end of which is connected to the other end of the analog-to-digital conversion module 23, and is used for storing the digital signal;
and a graphic display module 25, one end of which is connected to the other end of the memory module 24, for converting the digital signal into a waveform diagram.
When the direct current magnetic bias current of the neutral point of the transformer is measured, one end of the flexible current clamp is clamped on a grounding cable of the neutral point of the transformer, and then the data recorder is adopted to record current data of the neutral point.
Wherein, the range of flexible current clamp specifically includes:
inputting a measuring range: alternating current or direct current of ± 200A;
outputting a measuring range: direct current of ± 20 mA.
Specifically, the gear adjusting module of the flexible current clamp can change the measuring range of the flexible current clamp, and select a proper measuring range according to the test data, so that the measuring range of the flexible current clamp is matched with the measuring range of the data recorder, thereby improving the sampling precision and ensuring that the measuring result does not exceed the measuring range of the data recorder.
Further, if the neutral point current is too large and the output current is relatively large, the waveform change of the shunt resistor can be monitored by adding a small resistor in parallel.
The preset frequency of the data recorder is 100KHz, the acquisition time is 200s, and the input rated voltage is +/-5V.
In a preferred embodiment, on the basis of fig. 2, the data recorder further includes a wireless communication module, one end of which is connected to the other end of the graphic display module, and is configured to establish a wireless communication connection with a user terminal device and transmit the waveform diagram to the user terminal device.
In a preferred embodiment, on the basis of fig. 2, the data recorder further includes a wired communication module, one end of which is connected to the other end of the graphic display module, and is configured to establish a wired communication connection with a user terminal device and transmit the waveform diagram to the user terminal device.
According to the direct current magnetic bias current measuring system, the data recorder is provided with the sampling parameter setting module, the sampling frequency can be set, the change rule of the current of the neutral point of the transformer is completely recorded, and the integrity of the analysis data of the direct current magnetic bias current of the transformer is ensured; meanwhile, the flexible current clamp provides a plurality of measurable ranges, and the corresponding ranges can be switched according to the current of the neutral point of the transformer, so that the applicability is improved; in addition, the data recorder can also establish communication connection with user terminal equipment, and transmit the oscillogram to the user terminal equipment, so that the observation is facilitated.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be noted that, for those skilled in the art, several equivalent obvious modifications and/or equivalent substitutions can be made without departing from the technical principle of the present invention, and these obvious modifications and/or equivalent substitutions should also be regarded as the scope of the present invention.
Claims (5)
1. A direct current bias current measurement system, comprising:
one end of the flexible current clamp is clamped with the neutral point grounding cable of the transformer; the flexible current clamp is provided with a gear adjusting module for adjusting the measuring range;
the data recorder is connected with the other end of the flexible current clamp and used for recording data detected by the flexible current clamp;
the data recorder specifically comprises:
one end of the data input module is connected with the other end of the flexible current clamp, the amplitude of the data detected by the flexible current clamp is controlled within a preset amplitude by using an attenuation probe, and the data is recorded;
a sampling parameter setting module, one end of which is connected with the other end of the data input module, and is used for setting the sampling frequency to be a preset sampling frequency and carrying out channel circulation or channel selection operation;
one end of the analog-to-digital conversion module is connected with the other end of the sampling parameter setting module and is used for converting an analog signal into a digital signal;
one end of the storage module is connected with the other end of the analog-to-digital conversion module and is used for storing the digital signal;
and one end of the graphic display module is connected with the other end of the storage module and is used for converting the digital signal into a oscillogram.
2. The dc bias current measurement system of claim 1, wherein the range of the flexible current clamp specifically comprises:
inputting a measuring range: alternating current or direct current of ± 200A;
outputting a measuring range: direct current of ± 20 mA.
3. The dc bias current measurement system according to claim 1, wherein the predetermined sampling frequency is 100 KHz.
4. The dc bias current measuring system according to claim 1, wherein the data recorder further comprises a wireless communication module, one end of which is connected to the other end of the graphic display module, for establishing a wireless communication connection with a user terminal device and transmitting the oscillogram to the user terminal device.
5. The dc bias current measuring system according to claim 1, wherein the data recorder further comprises a wired communication module, one end of which is connected to the other end of the graphic display module, for establishing a wired communication connection with a user terminal device and transmitting the oscillogram to the user terminal device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121654689.1U CN215894735U (en) | 2021-07-20 | 2021-07-20 | Direct current magnetic bias current measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121654689.1U CN215894735U (en) | 2021-07-20 | 2021-07-20 | Direct current magnetic bias current measuring system |
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| Publication Number | Publication Date |
|---|---|
| CN215894735U true CN215894735U (en) | 2022-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121654689.1U Active CN215894735U (en) | 2021-07-20 | 2021-07-20 | Direct current magnetic bias current measuring system |
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| CN (1) | CN215894735U (en) |
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2021
- 2021-07-20 CN CN202121654689.1U patent/CN215894735U/en active Active
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