GIS mutual inductor anti-interference device and transformer substation

Abstract

The utility model provides a GIS mutual inductor anti-interference device and a transformer substation. The GIS mutual inductor anti-interference device is characterized in that a GIS mutual inductor is connected with a power grid; the power detection module is connected with the GIS mutual inductor; the sampling module is connected with the power detection module; and the far-end module is connected with the GIS mutual inductor. The output of the GIS mutual inductor is integrated through the power detection module, current and voltage signals are reduced, and phenomena such as electric arc and fast transient overvoltage are captured from the current and voltage signals; through analog-to-digital conversion performed by the sampling module, disturbance parameters of the electric arc and the fast transient overvoltage on the power grid are recorded in real time; high-precision measurement of physical quantity is realized through photoelectric conversion operation of the remote module on the output of the GIS mutual inductor; through the synchronous operation of the synthesis module on the output of the far-end module and the sampling module, the working capability of the far-end module, the sampling module and GIS mutual inductor quality inspection on the same time reference is improved, so that the interference of disturbance parameters on a power grid is eliminated, and the system has wide applicability.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a GIS instrument transformer anti-interference device and a substation. Background Technology

[0002] Gas-Insulated Switchgear (GIS) transformers, or instrument transformers in gas-insulated metal-enclosed switchgear, use sulfur hexafluoride gas, which has excellent insulation and arc-quenching properties, as the insulating and arc-quenching medium. All high-voltage electrical components are sealed within a grounded metal cylinder. Due to phenomena such as operating arcs and rapid transient overvoltages, electromagnetic interference can easily occur to GIS transformers, thus affecting load stability. Therefore, improving the anti-interference capability of GIS transformers has become a research hotspot.

[0003] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this application. Utility Model Content

[0004] This application aims to at least partially address one of the technical problems in the related art.

[0005] Therefore, one objective of this application is to provide an anti-interference device for a GIS current transformer, comprising: a GIS current transformer, a remote module, a power detection module, a sampling module, and a synthesis module, wherein the GIS current transformer is connected to the power grid; the power detection module is connected to the GIS current transformer and performs integration processing on the output signal of the GIS current transformer; the sampling module is connected to the power detection module and performs analog-to-digital conversion on the output signal of the power detection module; the remote module is connected to the GIS current transformer and converts the output signal of the GIS current transformer into an optical signal; the synthesis module is connected to the remote module and the sampling module and synchronizes the outputs of the remote module and the sampling module to output a signal driving the load.

[0006] According to an embodiment of the present application, the GIS current transformer anti-interference device further includes a backup module, which is connected to the GIS current transformer and the sampling module, and is used to synchronize the output of the GIS current transformer and the sampling module and output a signal to drive the load when the remote module or the synthesis module is abnormal.

[0007] According to one embodiment of the present application, the GIS current transformer anti-interference device includes a three-phase common box structure and a split structure.

[0008] According to an embodiment of the GIS current transformer anti-interference device of this application, the power detection module includes a hardware integration unit and a software integration unit, wherein the hardware integration unit performs analog integration operation on the output signal of the GIS current transformer; the software integration unit is connected to the hardware integration unit and performs acquisition, quantization, encoding and numerical integration operations on the output of the hardware integration unit.

[0009] According to an embodiment of the GIS current transformer anti-interference device of this application, the hardware integration unit includes a first amplification circuit, a filter, and an integration circuit, wherein the first amplification circuit is connected to the output terminal of the GIS current transformer; the filter is connected to the first amplification circuit; and the integration circuit is connected to the filter.

[0010] According to an embodiment of the GIS current transformer anti-interference device of this application, the sampling module adopts at least two sets of analog-to-digital converters, wherein each of the analog-to-digital converters is connected to the power detection module and participates in analog-to-digital conversion calculation.

[0011] According to an embodiment of this application, the GIS current transformer anti-interference device includes a remote module comprising a sensing element, a filtering circuit, a second amplification circuit, and a photoelectric converter, wherein the sensing element is connected to the GIS current transformer; the filtering circuit is connected to the sensing element; the second amplification circuit is connected to the filtering circuit; and the photoelectric converter is connected to the second amplification circuit.

[0012] According to one embodiment of the present application, the GIS current transformer anti-interference device includes a Rogowski coil as the sensing element.

[0013] According to an embodiment of the GIS current transformer anti-interference device of this application, the synthesis module uses interpolation and time alignment to synchronize the outputs of the remote module and the sampling module.

[0014] Therefore, another objective of this application is to provide a substation that includes the GIS current transformer anti-interference device proposed in the embodiments of this application.

[0015] In this application, the output of the GIS current transformer is integrated by a power detection module to reconstruct current and voltage signals, and phenomena such as electric arc and rapid transient overvoltage are captured from the current and voltage signals; analog-to-digital conversion is performed by a sampling module to record the disturbance parameters of electric arc and rapid transient overvoltage on the power grid in real time; photoelectric conversion of the output of the GIS current transformer by a remote module enables high-precision measurement of physical quantities; and synchronous operation of the outputs of the remote module and the sampling module by a synthesis module improves the ability of the remote module, the sampling module, and the GIS current transformer quality inspection to operate on the same time base, thereby eliminating the interference of disturbance parameters on the power grid and having wide applicability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a GIS current transformer anti-interference device provided in an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of another GIS current transformer anti-interference device provided in an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of the power detection module provided according to an embodiment of this application;

[0019] Figure 4 This is a schematic diagram of the hardware integration unit provided according to an embodiment of this application;

[0020] Figure 5 This is a schematic diagram of the structure of a remote module provided according to an embodiment of this application. Detailed Implementation

[0021] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0022] The following description, in conjunction with the accompanying drawings, describes the GIS instrument transformer anti-interference device and substation according to embodiments of this application.

[0023] Figure 1 This is a schematic diagram of the structure of a GIS current transformer anti-interference device provided in an embodiment of this application, as shown below. Figure 1 As shown, the GIS current transformer anti-interference device according to an embodiment of this application includes: a GIS current transformer, a remote module, a power detection module, a sampling module, and a synthesis module, wherein:

[0024] like Figure 1As shown, GIS instrument transformers are connected to the power grid and are responsible for converting electrical quantities such as high voltage and large current into electrical quantities such as low voltage and small current that are easy to measure, protect and control. The connection between GIS instrument transformers and the power grid is mainly achieved through cables or busbars. The specific connection method depends on factors such as the type of instrument transformer, voltage level and the structure of the power grid.

[0025] like Figure 1 As shown, the power detection module is connected to the GIS instrument transformer and performs integration processing on the output signal of the GIS instrument transformer. The signal output by the GIS instrument transformer is typically a signal directly proportional to the differential of the primary current or primary voltage with respect to time. To reconstruct the original primary current or primary voltage signal, these differential signals need to be integrated. It should be noted that primary current refers to the current in the primary circuit connected to the GIS instrument transformer; primary voltage refers to the voltage in the primary circuit connected to the GIS instrument transformer. The primary circuit is the part of the power system that directly participates in the generation, transmission, and distribution of electrical energy, and is composed of interconnected primary equipment, including generators, power transformers, circuit breakers, disconnect switches, busbars, power cables, and transmission lines.

[0026] It's important to add that, in contrast to the primary circuit, there is the secondary circuit, also known as a secondary loop or control circuit. The secondary circuit mainly consists of secondary equipment, including measuring instruments, control devices, monitoring signal devices, automated monitoring systems, relay protection and safety automatic devices, and communication equipment. While the secondary circuit does not directly participate in the generation and transmission of electrical energy, its role is crucial. It is primarily used to monitor, control, regulate, and protect the primary equipment, ensuring the safe and stable operation of the primary circuit.

[0027] like Figure 1 As shown, the sampling module is connected to the power detection module and performs analog-to-digital conversion on the output signal of the power detection module. The sampling module is responsible for acquiring continuous analog signals from the power detection module and performing analog-to-digital conversion to obtain digital signals for subsequent digital signal processing or data recording.

[0028] like Figure 1 As shown, the remote module is connected to the GIS current transformer and converts the output signal of the GIS current transformer into an optical signal. The remote module is mainly responsible for signal acquisition, processing and transmission. For example, the remote module measures the primary current and primary voltage and converts the measured analog signal into an optical signal that is easy to transmit. This optical signal is used to compare and verify with the output of the sampling module, reducing the impact of disturbances caused by operating arcs, rapid transient overvoltages, etc. on the synchronization of data, thereby improving the anti-interference capability.

[0029] like Figure 1As shown, the synthesis module is connected to the remote module and the sampling module, and synchronizes the outputs of the remote module and the sampling module to output a signal to drive the load. Since random errors and noise are introduced by phenomena such as operating arc and fast transient overvoltage, the synchronous operation based on the synthesis module can reduce the inaccuracy and asynchrony of data caused by operating arc, fast transient overvoltage, etc., which helps to more accurately estimate and suppress disturbances.

[0030] In one feasible implementation, the GIS current transformer anti-interference device of this application further includes a backup module. Figure 2 This is a schematic diagram of another GIS current transformer anti-interference device provided in an embodiment of this application. Figure 2 As shown, the backup module is connected to the GIS instrument transformer and the sampling module. It is used to synchronize the outputs of the GIS instrument transformer and the sampling module, and output a signal to drive the load, in the event of an anomaly in the remote module or the synthesis module. It should be noted that if the remote module or the synthesis module malfunctions, a predefined protection scheme can promptly disconnect it from the GIS instrument transformer, the sampling module, and the load. This process includes fault isolation and enabling the backup module (i.e., enabling the connection between the backup module and the GIS instrument transformer, the sampling module, and the load). Furthermore, the backup module acquires data from the GIS instrument transformer and the sampling module, and synchronizes the data, reducing inaccuracies and asynchronies caused by operating arcs, rapid transient overvoltages, etc., thus improving the accuracy of estimations and the ability to suppress disturbances.

[0031] Optionally, as examples, GIS instrument transformers can be installed in two ways: a three-phase common enclosure structure and a split-type structure. It should be noted that GIS instrument transformers can be used as current and voltage sensors to accurately measure current and voltage signals in power systems. For example, they can utilize electronic components to change the current ratio and transmit signals via optical fiber. Furthermore, the three-phase common enclosure structure integrates three single-phase instrument transformers into a single metal housing to reduce floor space and simplify installation; the split-type structure involves disassembling the GIS instrument transformer into multiple independent components. The installation method of the GIS instrument transformer should be selected based on the specific application scenario, which will not be elaborated further here.

[0032] Alternatively, as an example, Figure 3 This is a schematic diagram of the power detection module provided according to an embodiment of this application. Figure 3As shown, the power detection module includes a hardware integration unit and a software integration unit. The hardware integration unit performs analog integration on the output signal of the GIS current transformer. The software integration unit is connected to the hardware integration unit and performs acquisition, quantization, encoding, and numerical integration on the output of the hardware integration unit. It should be noted that the hardware integration unit first amplifies and filters the input current and voltage signals, then converts them into digital signals for acquisition. Next, the software integration unit performs integration on these digital signals to obtain the required integral value. During this process, the software integration unit can further process and analyze the integration results, such as filtering and smoothing, to improve the measurement accuracy and stability of the signal.

[0033] Furthermore, Figure 4 This is a schematic diagram of the hardware integration unit provided according to an embodiment of this application. Figure 4 As shown, the hardware integration unit includes a first amplifier circuit, a filter, and an integrator circuit. The first amplifier circuit is connected to the output terminal of the GIS current transformer; the filter is connected to the first amplifier circuit; and the integrator circuit is connected to the filter. It should be noted that the integrator circuit typically consists of components such as capacitors, resistors, and transistors. The capacitor is used to accumulate charge and generate an output voltage, the resistor is used to limit current and provide an input signal, and the transistor is used to control the discharge process of the capacitor, thereby controlling the integration time. When current flows through the capacitor, the capacitor gradually accumulates charge and generates a voltage; the voltage across the capacitor is the output voltage of the integrator circuit, which is equal to the integral of the input current over time.

[0034] It should be noted that the power detection module can also be configured using Application Specific Integrated Circuit (ASIC). ASIC is an integrated circuit designed and manufactured for specific user requirements and specific systems. In this embodiment, the integrated circuit is characterized as a stability detection circuit. IP cores (intellectual property cores) are mature designs of circuit modules with independent functions in chip or integrated circuit designs. These circuit designs can be applied to other chip or integrated circuit design projects that include the circuit module, thereby reducing the design workload, shortening the design cycle, and improving the success rate of chip or integrated circuit design. IP cores are classified into three levels: behavioral, structural, and physical, thus corresponding to three types of IP cores: soft cores designed with hardware description languages, solid cores that complete structural descriptions, and hard cores based on physical descriptions and verified by the process. The specific configuration methods will not be elaborated here. As long as the output signal of the GIS current transformer can be integrated, any configuration method of the power detection module is applicable and is not limited to this embodiment.

[0035] Optionally, as an example, the sampling module employs at least two sets of analog-to-digital converters (ADCs), each connected to the power detection module and participating in the analog-to-digital conversion operation. It should be noted that at least two sets of ADCs constitute a multi-AD (Analog-to-Digital) sampling function. Multiple AD sampling can share the same clock source and trigger source to ensure sampling synchronization. During the sampling phase, multiple sets of ADCs simultaneously acquire analog signals, and then convert the acquired data into digital outputs during the conversion phase. After acquiring multiple sets of sampled data, real-time and effective detection, comparison, and verification can be performed. For example, comparing the differences between two sampled values, verifying the rationality of the sampled data, and detecting abnormal fluctuations in the sampled values. Through these operations, errors or anomalies in the sampling process can be detected and corrected in a timely manner, thereby ensuring the accuracy and reliability of the data.

[0036] Alternatively, as an example, Figure 5 This is a schematic diagram of the structure of a remote module provided according to an embodiment of this application. Figure 5 As shown, the remote module includes a sensing element, a filtering circuit, a second amplifier circuit, and a photoelectric converter. The sensing element is connected to the GIS current transformer; for example, a Rogowski coil can be used as the sensing element. The filtering circuit is connected to the sensing element; the second amplifier circuit is connected to the filtering circuit; and the photoelectric converter is connected to the second amplifier circuit. It should be noted that the remote module preprocesses the analog signal output from the sensing element, including filtering, amplification, and photoelectric conversion, and then sends the processed signal to the synthesis module via a high-speed serial protocol, such as a high-speed serial protocol.

[0037] It should be noted that the remote module can also be configured using dedicated integrated circuits, IP cores, etc. The specific configuration methods will not be elaborated here. As long as it can achieve high-precision measurement of physical quantities such as current and voltage and convert them into optical signals for transmission, any configuration method of the remote module is applicable and is not limited to this embodiment.

[0038] Optionally, as an example, the synthesis module uses interpolation and time alignment to synchronize the outputs of the remote module and the sampling module. It should be noted that interpolation can be used to extrapolate missing or delayed data points from existing data points, thus completing the dataset; then, aligning the different data points on the time axis ensures they reflect the data state at the same point in time, which helps reduce data errors and improve data accuracy and reliability.

[0039] Specifically, according to embodiments of this application, the GIS instrument transformer anti-interference device referenced above can be implemented as a substation. This substation can generate a drive signal matching the load by integrating, converting analog to digital, generating optical signals, and performing data synchronization operations on the output signal of the GIS instrument transformer.

[0040] In summary, the GIS instrument transformer anti-interference device and substation of this application integrate the output of the GIS instrument transformer through the power detection module to reconstruct the current and voltage signals, and capture phenomena such as electric arc and rapid transient overvoltage from the current and voltage signals; through analog-to-digital conversion performed by the sampling module, the disturbance parameters of electric arc and rapid transient overvoltage on the power grid are recorded in real time; through photoelectric conversion operation of the GIS instrument transformer output by the remote module, high-precision measurement of physical quantities is achieved; through the synchronization operation of the output of the remote module and the sampling module by the synthesis module, the ability of the remote module, the sampling module and the GIS instrument transformer quality inspection to operate on the same time base is improved, thereby eliminating the interference of disturbance parameters on the power grid, and has wide applicability.

[0041] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0046] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A GIS current transformer anti-interference device, characterized in that, include: The system includes a GIS instrument transformer, a remote module, a power detection module, a sampling module, and a synthesis module. The GIS instrument transformer is connected to the power grid. The power detection module is connected to the GIS instrument transformer and performs integration processing on the output signal of the GIS instrument transformer. The sampling module is connected to the power detection module and performs analog-to-digital conversion on the output signal of the power detection module; the remote module is connected to the GIS current transformer and converts the output signal of the GIS current transformer into an optical signal; the synthesis module is connected to the remote module and the sampling module and synchronizes the outputs of the remote module and the sampling module to output a signal to drive the load.

2. The GIS current transformer anti-interference device according to claim 1, characterized in that, It also includes a backup module, which is connected to the GIS current transformer and the sampling module. The backup module is used to synchronize the output of the GIS current transformer and the sampling module and output a signal to drive the load when the remote module or the synthesis module is abnormal.

3. The GIS current transformer anti-interference device according to claim 1, characterized in that, The GIS current transformers can be configured in two ways: a three-phase common-box structure and a split structure.

4. The GIS current transformer anti-interference device according to claim 1, characterized in that, The power detection module includes a hardware integration unit and a software integration unit. The hardware integration unit performs analog integration on the output signal of the GIS current transformer. The software integration unit is connected to the hardware integration unit and performs acquisition, quantization, encoding, and numerical integration on the output of the hardware integration unit.

5. The GIS current transformer anti-interference device according to claim 4, characterized in that, The hardware integration unit includes a first amplifier circuit, a filter, and an integration circuit. The first amplifier circuit is connected to the output terminal of the GIS current transformer; the filter is connected to the first amplifier circuit; and the integration circuit is connected to the filter.

6. The GIS current transformer anti-interference device according to claim 1, characterized in that, The sampling module employs at least two sets of analog-to-digital converters, wherein each of the analog-to-digital converters is connected to the power detection module and participates in the analog-to-digital conversion operation.

7. The GIS current transformer anti-interference device according to claim 1, characterized in that, The remote module includes a sensing element, a filtering circuit, a second amplification circuit, and a photoelectric converter. The sensing element is connected to the GIS current transformer; the filtering circuit is connected to the sensing element; the second amplification circuit is connected to the filtering circuit; and the photoelectric converter is connected to the second amplification circuit.

8. The GIS current transformer anti-interference device according to claim 7, characterized in that, The sensing element includes a Rogowski coil.

9. The GIS current transformer anti-interference device according to claim 1, characterized in that, The synthesis module uses interpolation and time alignment to synchronize the outputs of the remote module and the sampling module.

10. A substation, characterized in that, The substation includes a GIS instrument transformer anti-interference device as described in any one of claims 1-9.

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