CN117849446A - Transformer substation ground current detection system, method, electronic equipment and medium - Google Patents
Transformer substation ground current detection system, method, electronic equipment and medium Download PDFInfo
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- CN117849446A CN117849446A CN202410258669.4A CN202410258669A CN117849446A CN 117849446 A CN117849446 A CN 117849446A CN 202410258669 A CN202410258669 A CN 202410258669A CN 117849446 A CN117849446 A CN 117849446A
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Abstract
The embodiment of the invention provides a system, a method, electronic equipment and a medium for detecting ground current of a transformer substation, and belongs to the field of transformer substations. This transformer substation goes into ground current detecting system includes: the current transformer is arranged at the inlet wire and the ground wire of the transformer substation; the voltage transformer is arranged at a wire inlet bus of the transformer substation; and the ground current detection device is respectively connected with the secondary terminal of the current transformer and the secondary terminal of the mutual inductance of the voltage transformer and is used for detecting the ground current of the grounding network of the transformer substation when the grounding fault occurs to the transformer substation. The secondary terminal of the current transformer arranged at the inlet wire and the ground wire of the transformer substation and the secondary terminal of the voltage transformer arranged at the inlet wire bus of the transformer substation are connected to the ground current detection device, when the transformer substation has a ground fault, the ground current of the grounding network is detected in real time, the influence of external factors on the ground current of the grounding network is small, and the accuracy of the ground current of the grounding network is improved.
Description
Technical Field
The invention relates to the technical field of substations, in particular to a system and a method for detecting ground current of a substation, electronic equipment and a medium.
Background
In recent years, the safety problem is more and more paid attention to, development and safety are comprehensively developed, the first installation is adhered to, the prevention is mainly, and the safe red line consciousness is kept. The safety of the power grid is more relevant to thousands of households. The substation is an important component of the power grid, and thus the safety of the substation is also part of the power grid safety. The grounding network in the transformer substation is an important factor for ensuring the safety of the transformer substation. Therefore, the grounding network of the transformer substation can meet the requirements when in use no matter how the system changes. When the transformer substation is built, the whole station grounding grid is laid, and the grounding resistance of the grounding grid meets the specified requirement. The magnitude of the grounding resistance is related to the grounding current of the grounding grid.
Grounding is designed by CDEGS grounding analysis software. The CDEGS software can calculate the calculated value of the grounding current of the grounding network of the transformer substation by constructing a model, however, in actual operation, the model constructed by the software is only an ideal model and the model is actually in and out, and the change of system parameters of the transformer substation, the transformation of a power transmission line and the change of meteorological conditions can all influence the grounding current of the grounding network, so that the accuracy of the grounding current of the grounding network is reduced.
Disclosure of Invention
When the system is in single-phase grounding during grounding current of the grounding network of the transformer substation, one part of grounding fault current flows into the ground through the grounding network of the transformer substation, one part flows out through the neutral point of the transformer, and the other part flows into the tower ground and the neutral point of the transformer of the opposite side transformer substation in a scattered manner through the overhead line lightning conductor. And thus direct measurement cannot be performed. The measurement can only be performed in an indirect way. Therefore, the invention is based on the ground current principle of the grounding network, thereby providing a system, a method, electronic equipment and a medium for detecting the ground current of the transformer substation.
The embodiment of the invention aims to provide a transformer substation ground current detection system, a transformer substation ground current detection method, electronic equipment and a medium, which are used for solving all or at least part of the technical problems in the prior art.
In order to achieve the above object, an embodiment of the present invention provides a transformer substation ground current detection system, including:
the current transformer is arranged at the inlet wire and the ground wire of the transformer substation;
the voltage transformer is arranged at a wire inlet bus of the transformer substation; and;
the ground current detection device is respectively connected with the secondary terminal of the current transformer and the secondary terminal of the mutual inductance of the voltage transformer, and is used for enabling the voltage of a fault phase line to be zero when the transformer substation has a ground fault, and enabling the effective value of subtracting the current flowing through all the ground wires of the transformer substation from the current flowing through the fault phase line to be the ground current of the transformer substation ground network.
Optionally, the ground current detection device includes:
the analog quantity acquisition module is used for acquiring current and voltage data of each line of the transformer substation based on the current transformer and the voltage transformer;
the central data processor is used for processing the current and voltage data acquired by the analog quantity acquisition module to obtain the grounding current of the transformer substation grounding network; and;
and the output module is used for outputting the grounding current of the transformer substation grounding network.
Optionally, the analog quantity acquisition module includes:
the low-pass filter is respectively connected with the current transformer and the voltage transformer;
and the multichannel A/D converter is connected with the low-pass filter and is used for converting the analog quantity output by the low-pass filter into a digital quantity and transmitting the digital quantity to the central data processor.
Optionally, the central data processor is configured to obtain the substation ground network access current according to the following formula:
in the formula, |Id| represents the grounding current of the grounding network of the transformer substation, |I 1 I represents the current flowing through the faulty phase line I N1 I represents the current flowing through the substation ground.
Optionally, the ground current detection device is further configured to display an instantaneous value of each line current of the substation by using a waveform, and display an effective value of the ground current of the substation grounding network by using a digital form.
On the other hand, the invention also provides a ground current detection method applied to the substation ground current detection system, which comprises the following steps:
when a ground fault occurs, current data and voltage data in each line of the transformer substation are obtained, wherein each line of the transformer substation comprises a transformer substation inlet wire, a ground wire and an inlet wire bus;
if the voltage of one phase line in each line of the transformer substation becomes zero, the phase line has a short-circuit fault, and the current flowing through the fault phase line minus the current flowing through all the ground lines of the transformer substation is regarded as the ground current.
In another aspect, the present invention further provides an electronic device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the steps of the above-mentioned method for detecting an in-ground current are implemented when the processor executes the program.
In another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the earth-going current detection method as described above.
Through above-mentioned technical scheme, through the current transformer that sets up in transformer substation inlet wire and ground wire department and the secondary terminal of voltage transformer that sets up in transformer substation inlet wire generating line department even insert ground current detection device, when the transformer substation took place the earth fault, real-time detection earth screen inserts the earth current, it receives external factor's influence less, and then has improved the degree of accuracy of earth screen and inserted the earth current.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain, without limitation, the embodiments of the invention. In the drawings:
fig. 1 is a schematic structural diagram of a transformer substation ground current detection system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an earth-entering current detecting device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an earth-entering current detecting device according to an embodiment of the present invention;
fig. 4 is a flowchart of an implementation of a method for detecting an earth current applied to a transformer substation earth current detection system according to an embodiment of the present invention.
Description of the reference numerals
1. Overhead ground wire of overhead conductor 2
3. Overhead pole tower 4 transformer substation grounding grid
5. Transformer 6 goes into ground current detection device
Detailed Description
The following describes the detailed implementation of the embodiments of the present invention with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
Referring to fig. 1, a schematic structural diagram of a transformer substation ground current detection system according to an embodiment of the present invention includes: a current transformer (not shown in the figure) disposed at the incoming line and the ground line of the transformer substation; a voltage transformer (not shown in the figure) disposed at an incoming bus of the substation; and the ground current detection device is respectively connected with the secondary terminal of the current transformer and the secondary terminal of the mutual inductance of the voltage transformer, and is used for subtracting the effective value of the current flowing through all the ground wires of the transformer substation from the current flowing through the fault phase line to obtain the ground current of the transformer substation when the transformer substation has the ground fault.
The ground wire is connected with a plurality of grounding grids, and a current transformer corresponding to each grounding grid is arranged.
As shown in fig. 1, three phase lines (TA 1, TB1, TC 1) in a transformer substation overhead conductor 1 are connected in parallel, one end of a grounding network 4 is connected with the transformer substation overhead conductor 1 through a transformer 5, the other end is connected with a transformer substation overhead ground wire 2 (TN 1), a plurality of overhead towers 3 (T1, T2 … … Ts) are arranged in fig. 1, a ground current detection device 6 is connected with a secondary terminal of a current transformer through a secondary cable, and I is obtained respectively A1/n 、I B1/n 、I C1/n I N1/n The bus voltage inputs TVa, TVb, TVc and TVn (i.e., the power transformation) are obtained by connecting the secondary terminals of the voltage transformer via a secondary cableThe voltage of the three phase lines (TA 1, TB1, TC 1) in the overhead conductor 1.
In some implementations, referring to fig. 2, a schematic structural diagram of an in-ground current detection device according to an embodiment of the present invention is shown, where the in-ground current detection device includes an analog acquisition module, configured to acquire current-voltage data of each line of a transformer substation based on the current transformer and the voltage transformer; the central data processor is used for processing the current and voltage data acquired by the analog quantity acquisition module to obtain the grounding current of the transformer substation grounding network; and the output module is used for outputting the grounding current of the transformer substation grounding network.
In some implementations, referring to fig. 3, a schematic diagram of an in-ground current detection device according to an embodiment of the present invention is shown, where the analog quantity acquisition module includes a low-pass filter, which is connected to the current transformer and the voltage transformer respectively; and the multichannel A/D converter is connected with the low-pass filter and is used for converting the analog quantity output by the low-pass filter into a digital quantity and transmitting the digital quantity to the central data processor.
It should be noted that the number of the low-pass filters may be set according to a specific application scenario, and is not limited herein, and in this embodiment, the number is set to 2, and corresponds to the voltage transformer and the current transformer respectively.
In some embodiments, referring to fig. 3, the central data processor further stores the digital data into the RAM and the ROM, the CPU processes the digital data, and then transmits the result to the monitoring host through the communication interface (CAN, RS485 may be used) and then displays the calculation result (man-machine interaction (LCD display screen function setting button)) after processing the digital data.
In some embodiments, referring to fig. 3, the ground current detection device is further provided with a power supply system (DC 220).
In some embodiments, under normal operation conditions, the A, B, C three-phase lines have voltage and current, the ground wire has no current, when a certain phase such as the phase A is grounded, the phase A current increases, and the ground wire also has current, at this time, the ground network ground current is determined as the current value flowing through the phase A minus the current flowing through all the ground wires.
In some embodiments, if the a-phase voltage becomes 0 when a short circuit fault occurs in the a-phase line in the substation, the ground network ground current is the effective value of the current flowing through the faulty phase line a minus the current flowing through all the ground lines.
In some embodiments, the central data processor is configured to obtain the substation ground network access current according to the following formula:
in the formula, |Id| represents the grounding current of the grounding network of the transformer substation, |I 1 I represents the current flowing through the faulty phase line I N1 I represents the current flowing through the substation ground.
In some embodiments, the criteria for the ground current detection device may be set as: fault phase voltage tv=0, output result |id|= |i 1 |-|I N1 |。
In some embodiments, the ground current detection device is further configured to display an instantaneous value of each line current of the substation by using a waveform, and display an effective value of the ground current of the substation ground network by using a digital form.
It will be appreciated that the current of the power system is a time varying waveform with a frequency of 50HZ and an effective value of root mean square.
Through above-mentioned technical scheme, through the current transformer that sets up in transformer substation inlet wire and ground wire department and the secondary terminal of voltage transformer that sets up in transformer substation inlet wire generating line department even insert ground current detection device, when the transformer substation took place the earth fault, real-time detection earth screen inserts the earth current, it receives external factor's influence less, and then has improved the degree of accuracy of earth screen and inserted the earth current.
In some embodiments, referring to fig. 4, a flowchart of an implementation of a ground current detection method applied to the ground current detection system of a transformer substation according to any one of the embodiments of the present invention is shown, including the following implementation steps:
step 400: and when the ground fault occurs, acquiring current data and voltage data in each line of the transformer substation.
Each line of the transformer substation comprises a transformer substation incoming line, a ground wire and an incoming bus.
Step 401: if the voltage of one phase line in each line of the transformer substation becomes zero, the phase line has a short-circuit fault, and the current flowing through the fault phase line minus the current flowing through all the ground lines of the transformer substation is regarded as the ground current.
On the other hand, the embodiment of the invention also provides an electronic device, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes the steps of the above-mentioned earth-current detection method when executing the program.
In another aspect, an embodiment of the present invention further provides a non-transitory computer readable storage medium, on which a computer program is stored, where the computer program when executed by a processor implements the steps of the above-mentioned method for detecting an earth-going current.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (8)
1. A substation ground current detection system, comprising:
the current transformer is arranged at the inlet wire and the ground wire of the transformer substation;
the voltage transformer is arranged at a wire inlet bus of the transformer substation; and;
the ground current detection device is respectively connected with the secondary terminal of the current transformer and the secondary terminal of the mutual inductance of the voltage transformer, and is used for enabling the voltage of a fault phase line to be zero when the transformer substation has a ground fault, and enabling the effective value of subtracting the current flowing through all the ground wires of the transformer substation from the current flowing through the fault phase line to be the ground current of the transformer substation ground network.
2. The substation ground current detection system according to claim 1, wherein the ground current detection device comprises:
the analog quantity acquisition module is used for acquiring current and voltage data of each line of the transformer substation based on the current transformer and the voltage transformer;
the central data processor is used for processing the current and voltage data acquired by the analog quantity acquisition module to obtain the grounding current of the transformer substation grounding network; and;
and the output module is used for outputting the grounding current of the transformer substation grounding network.
3. The substation ground current detection system of claim 2, wherein the analog quantity acquisition module comprises:
the low-pass filter is respectively connected with the current transformer and the voltage transformer;
and the multichannel A/D converter is connected with the low-pass filter and is used for converting the analog quantity output by the low-pass filter into a digital quantity and transmitting the digital quantity to the central data processor.
4. The substation ground current detection system of claim 2, wherein the central data processor is configured to obtain the substation ground current according to the following formula:
in the formula, |Id| represents the grounding current of the grounding network of the transformer substation, |I 1 I represents the current flowing through the faulty phase line I N1 I represents the current flowing through the substation ground.
5. The system according to claim 1, wherein the ground current detection device is further configured to display instantaneous values of each line current of the substation using waveforms, and display effective values of ground current of the substation ground network using digital format.
6. A ground current detection method applied to the substation ground current detection system according to any one of claims 1 to 5, characterized by comprising:
when a ground fault occurs, current data and voltage data in each line of the transformer substation are obtained, wherein each line of the transformer substation comprises a transformer substation inlet wire, a ground wire and an inlet wire bus;
if the voltage of one phase line in each line of the transformer substation becomes zero, the phase line has a short-circuit fault, and the current flowing through the fault phase line minus the current flowing through all the ground lines of the transformer substation is regarded as the ground current.
7. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the earth-current detection method of claim 6 when the program is executed by the processor.
8. A non-transitory computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the earth-going current detection method as claimed in claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410258669.4A CN117849446A (en) | 2024-03-07 | 2024-03-07 | Transformer substation ground current detection system, method, electronic equipment and medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202410258669.4A CN117849446A (en) | 2024-03-07 | 2024-03-07 | Transformer substation ground current detection system, method, electronic equipment and medium |
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| CN117849446A true CN117849446A (en) | 2024-04-09 |
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| CN202410258669.4A Pending CN117849446A (en) | 2024-03-07 | 2024-03-07 | Transformer substation ground current detection system, method, electronic equipment and medium |
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