A pole-mounted switch with integrated coupler and capacitive voltage sensor

Abstract

The utility model relates to a pole switch with integrated coupler and capacitive voltage sensor, including, first electric capacity CH is connected with power A, and second electric capacity CL is connected with first electric capacity CH, one input of high pass filter and low pass filter is connected with one end of second electric capacity CL respectively, the output of high pass filter is connected signal coupler, the utility model promotes long -term reliability and measurement accuracy: in traditional scheme, because voltage sensor and communication coupler are separate, are easily affected by outside environment and lead to system unreliable or measurement inaccuracy. And the utility model through adopting low pass filter isolation high frequency signal ensures voltage sensor normal work, and uses high pass filter to guarantee signal coupler normal operation, effectively prevented high frequency communication signal to voltage sampling loop's crosstalk and strong power frequency voltage to coupler's damage, improved the long -term reliability and voltage measurement accuracy of system.

Description

Technical Field

[0001] This utility model belongs to the field of pole-mounted switch technology, specifically a pole-mounted switch with an integrated coupler and a capacitive voltage sensor. Background Technology

[0002] In distribution network automation systems, pole-mounted switches play a crucial role, requiring real-time and accurate monitoring of line voltage (such as the voltage of phase A of the power supply) and reliable remote communication capabilities. Traditional implementations typically employ a separate design: using independent capacitive voltage sensors (CVTs) to acquire power frequency voltage signals, and equipped with separate communication couplers (such as carrier communication couplers) for data uploading or command reception.

[0003] This split design has significant technical drawbacks:

[0004] Signal crosstalk and decreased measurement accuracy: High-frequency signals generated when the communication coupler is working are very easy to enter the sampling circuit of the voltage sensor through spatial coupling or common ground path, interfering with the accurate measurement of power frequency voltage, resulting in distorted measurement results and affecting the accuracy of protection, metering and monitoring functions. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] Given the following technical problems in the existing technology:

[0007] How can we effectively suppress crosstalk from high-frequency communication signals to the sampling circuit of voltage sensors to ensure high accuracy and stability of power frequency voltage measurement?

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a pole-mounted switch with an integrated coupler and a capacitive voltage sensor, comprising a first capacitor CH connected to a power supply A and a second capacitor CL connected to the first capacitor CH, one end of the second capacitor CL being connected to an input of a high-pass filter and a low-pass filter respectively, and the output of the high-pass filter being connected to a signal coupler.

[0009] As a preferred technical solution for a pole-mounted switch with an integrated coupler and a capacitive voltage sensor, the other end of the second capacitor CL is connected to another input of the high-pass filter and the low-pass filter, respectively.

[0010] As a preferred technical solution for a pole-mounted switch with an integrated coupler and a capacitive voltage sensor, the two output terminals of the low-pass filter are respectively connected to the output voltage VA+ of the voltage sensor and the common terminal Vcom of the voltage sensor.

[0011] As a preferred technical solution for a pole-mounted switch with an integrated coupler and a capacitive voltage sensor, the common terminal Vcom of the voltage sensor is grounded.

[0012] As a preferred technical solution for a pole-mounted switch with an integrated coupler and a capacitive voltage sensor, the signal coupler includes a coupling transformer Tn, and the output terminal of a high-pass filter is connected to the primary coil of the coupling transformer Tn.

[0013] As a preferred technical solution for a pole-mounted switch with an integrated coupler and a capacitive voltage sensor, the primary coil side of the coupling transformer Tn is connected to the secondary coil side of the coupling transformer Tn and grounded.

[0014] The beneficial effects of this invention are as follows: This invention improves long-term reliability and measurement accuracy. In traditional solutions, because the voltage sensor and communication coupler are separate, they are easily affected by the external environment, leading to system unreliability or inaccurate measurements. This invention, however, uses a low-pass filter to isolate high-frequency signals to ensure the normal operation of the voltage sensor and a high-pass filter to ensure the normal operation of the signal coupler. This effectively prevents crosstalk from high-frequency communication signals to the voltage sampling circuit and damage to the coupler from strong power frequency voltage, thus improving the long-term reliability of the system and the accuracy of voltage measurement. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0016] Figure 1 This is a schematic diagram of the electrical principle structure of this utility model.

[0017] Figure label: Signal coupler 1. Detailed Implementation

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0020] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0021] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0022] Example 1

[0023] Reference Figure 1 This embodiment provides a pole-mounted switch with an integrated coupler and a capacitive voltage sensor, including a first capacitor CH connected to a power supply A and a second capacitor CL connected to the first capacitor CH. One end of the second capacitor CL is connected to an input of a high-pass filter and a low-pass filter, respectively. The output of the high-pass filter is connected to a signal coupler 1.

[0024] In this embodiment, the pole-mounted switch is encapsulated in a 10KV circuit breaker. The 10KV circuit breaker obtains the phase voltage of power supply phase A from the high-voltage line. A capacitive voltage sensor consisting of a first capacitor CH and the first capacitor CH is used to collect the phase voltage of power supply phase A. The signal coupler 1 is used for bidirectional signal transmission.

[0025] In a voltage sensor, the first capacitor CH is the high-voltage arm capacitor, and the second capacitor CL is the low-voltage arm capacitor.

[0026] The relationship between the voltage VA of phase A of the power supply and the output voltage VA+ conforms to the following formula:

[0027] VA = K × VA +

[0028] In the above formula, K is the sampling coefficient.

[0029] The other end of the second capacitor CL is connected to the other input of the high-pass filter and the low-pass filter, respectively.

[0030] The two output terminals of the low-pass filter are connected to the output voltage VA+ of the voltage sensor and the common terminal Vcom of the voltage sensor, respectively.

[0031] The voltage sensor's common terminal Vcom is grounded.

[0032] The signal coupler 1 includes a coupling transformer Tn, and the output of the high-pass filter is connected to the primary coil of the coupling transformer Tn.

[0033] The signal coupler 1 also includes a high-voltage side coupling capacitor, which is a first capacitor CH, and a low-voltage side coupling capacitor, which is a second capacitor CL.

[0034] One side of the primary coil of the coupling transformer Tn is connected to one side of the secondary coil of the coupling transformer Tn and grounded.

[0035] In summary, VA is the A-phase power supply, VA+ is the voltage sensor output terminal, and Vcom is the voltage sensor common terminal. Vcom is connected to ground. Pi / Po is the coupler's signal transmission port. A low-pass filter is added to ensure the voltage sensor operates normally, and a high-pass filter is added to ensure the coupler operates normally.

[0036] This device, while possessing the general voltage sensor's function of acquiring voltage, also has the capability of high-frequency communication transmission and the ability to acquire high-frequency components or multiple harmonics on high-voltage lines. It provides reliable data support for power system analysis of power quality or harmonic sources.

[0037] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0038] This invention improves long-term reliability and measurement accuracy: In traditional solutions, the voltage sensor and communication coupler are separate, making the system susceptible to external environmental influences, leading to unreliability or inaccurate measurements. This invention, however, uses a low-pass filter to isolate high-frequency signals to ensure normal operation of the voltage sensor and a high-pass filter to ensure normal operation of the signal coupler. This effectively prevents crosstalk from high-frequency communication signals to the voltage sampling circuit and damage to the coupler from strong power frequency voltage, thus improving the long-term reliability of the system and the accuracy of voltage measurement.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A pole-mounted switch with an integrated coupler and a capacitive voltage sensor, characterized in that: It includes a first capacitor CH connected to power supply A and a second capacitor CL connected to the first capacitor CH. One end of the second capacitor CL is connected to an input of a high-pass filter and a low-pass filter, respectively. The output of the high-pass filter is connected to a signal coupler (1).

2. The pole-mounted switch with an integrated coupler and a capacitive voltage sensor according to claim 1, characterized in that: The other end of the second capacitor CL is connected to the other input of the high-pass filter and the low-pass filter, respectively.

3. The pole-mounted switch with an integrated coupler and a capacitive voltage sensor according to claim 2, characterized in that: The two output terminals of the low-pass filter are respectively connected to the output voltage VA+ of the voltage sensor and the common terminal Vcom of the voltage sensor.

4. The pole-mounted switch with an integrated coupler and a capacitive voltage sensor according to claim 3, characterized in that: The common terminal Vcom of the voltage sensor is grounded.

5. The pole-mounted switch with an integrated coupler and a capacitive voltage sensor according to claim 4, characterized in that: The signal coupler (1) includes a coupling transformer Tn, and the output of the high-pass filter is connected to the primary coil of the coupling transformer Tn.

6. The pole-mounted switch with an integrated coupler and a capacitive voltage sensor according to claim 5, characterized in that: One side of the primary coil of the coupling transformer Tn is connected to one side of the secondary coil of the coupling transformer Tn and grounded.

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