A medium-voltage carrier communication coupler circuit with electromagnetic induction power extraction function

Abstract

The present invention discloses a medium-voltage carrier communication coupler circuit with an electromagnetic induction power-drawing function, which relates to the field of communications. The circuit can realize the medium-voltage carrier communication coupler function and realize the power-drawing function by using a first transformer through the principle of electromagnetic induction, thereby solving the problems of irregular power-drawing and difficulty in power-drawing of a medium-voltage carrier communication carrier machine. The first inductor is used to ensure that the carrier communication signal is not diverted, and the second capacitor is used to isolate the industrial frequency power supply voltage to realize the multiplexing of the power supply voltage and the carrier communication interface. The first transformer is used to provide the measurement line voltage through the principle of electromagnetic induction, which meets the design requirements of a single-phase electromagnetic voltage transformer in the power system, and provides a reference for the deep integration of medium-voltage carrier communication technology in primary and secondary integrated products.

Description

Technical Field

[0001] The present invention relates to the field of communications, and in particular to a medium-voltage carrier communication coupler circuit with an electromagnetic induction power supply function. Background Art

[0002] Medium-voltage carrier communication utilizes 10kV medium-voltage distribution lines as a transmission channel. It is applicable to various types of 10kV lines, including purely overhead, purely power cable, and mixed overhead cable lines. By utilizing existing, well-established distribution lines as transmission channels, it offers advantages such as low investment, simple equipment, easy construction, convenient maintenance and management, synchronization with grid construction, rapid commissioning with new construction projects, and consistent coverage with the power system. This technology effectively addresses weak, unstable, or no communication signals in remote mountainous areas, as well as fiber breakpoints. It also enables full coverage of dedicated wired communication networks and has been widely used in distribution automation and electricity consumption data collection. Medium-voltage carrier communication transmitters are used in conjunction with medium-voltage carrier communication couplers.

[0003] However, medium-voltage carrier communication carriers require separate wiring for power supply and can generally only be directly connected to the power terminals of the distribution station concentrator or distribution terminal. This non-standard power supply method poses a risk to power safety. The separate installation of electromagnetic voltage transformers can easily lead to complicated and wasteful equipment in the distribution station. Furthermore, with the development of distribution automation, the State Grid Corporation of China is mainly promoting the integration of primary and secondary equipment. The power terminals all use standard aviation plug terminals, making it difficult for medium-voltage carrier communication carriers to obtain power. The best way to apply medium-voltage carrier communication technology is to deeply integrate it with the integrated primary and secondary product sets without changing the original standard interface design. This requires considering how to achieve deep integration of medium-voltage carrier communication couplers and electromagnetic voltage transformers.

[0004] It can be seen from this that how to achieve the deep integration of medium-voltage carrier communication couplers and electromagnetic voltage transformers, solve the problems of irregular and difficult power supply in the actual on-site application of medium-voltage carrier communication carrier machines, and realize the promotion and application of medium-voltage carrier communication technology are technical problems that need to be urgently solved by people in this field. Summary of the Invention

[0005] To solve the above technical problems, the present invention aims to provide a medium voltage carrier communication coupler circuit with electromagnetic induction power supply function, comprising: a first fuse, a second fuse, a first transformer, a first inductor, a second capacitor, a second transformer, a first capacitor, a first gas discharge tube, and a second gas discharge tube;

[0006] The first end of the first fuse is connected to the first high-voltage end, and the second end of the first fuse is connected to the first end of the primary side of the first transformer;

[0007] The first end of the second fuse is connected to the second high-voltage terminal, and the second end of the second fuse is connected to the second end of the primary side of the first transformer;

[0008] A first end of the secondary first winding of the first transformer is connected to a measurement line voltage terminal, a second end of the secondary first winding of the first transformer is connected to a common ground terminal, a first end of the secondary second winding of the first transformer is connected to a first end of the first inductor, and a second end of the secondary second winding of the first transformer is connected to a common ground terminal;

[0009] The second end of the first inductor is connected to the power supply voltage / carrier communication end;

[0010] A first end of the second capacitor is connected to the power supply voltage / carrier communication end, and a second end of the second capacitor is connected to the first end of the secondary side of the second transformer;

[0011] The second end of the secondary side of the second transformer is connected to the common ground, the first end of the primary side of the second transformer is connected to the second end of the first capacitor, and the second end of the primary side of the second transformer is connected to the ground;

[0012] A first end of the first capacitor is connected to a second end of the second fuse;

[0013] The first gas discharge tube is connected in parallel between the primary sides of the second transformer;

[0014] The second gas discharge tube is connected in parallel between the secondary sides of the second transformer;

[0015] Preferably, in the above-mentioned medium-voltage carrier communication coupler circuit with electromagnetic induction power supply function, the first fuse and the second fuse are high-voltage current-limiting fuses;

[0016] Preferably, in the above-mentioned medium-voltage carrier communication coupler circuit with electromagnetic induction power supply function, the first transformer is a medium-voltage power frequency transformer;

[0017] Preferably, in the above-mentioned medium voltage carrier communication coupler circuit with electromagnetic induction power supply function, the first inductor is a high-frequency reactor;

[0018] Preferably, in the above-mentioned medium voltage carrier communication coupler circuit with electromagnetic induction power supply function, the second capacitor is a metal film safety capacitor;

[0019] Preferably, in the above-mentioned medium voltage carrier communication coupler circuit with electromagnetic induction power supply function, the second transformer is a high frequency transformer;

[0020] Preferably, in the above-mentioned medium voltage carrier communication coupler circuit with electromagnetic induction power supply function, the first capacitor is a high voltage ceramic capacitor;

[0021] The present invention provides a medium-voltage carrier communication coupler circuit with an electromagnetic induction power-drawing function, which can realize the medium-voltage carrier communication coupler function and realize the power-drawing function by using a first transformer through the principle of electromagnetic induction, thereby solving the problems of irregular power drawing and difficulty in power drawing of a medium-voltage carrier communication carrier machine. The first inductor is used to ensure that the carrier communication signal is not diverted, and the second capacitor is used to isolate the industrial frequency power supply voltage to realize the multiplexing of the power supply voltage and the carrier communication interface. The first transformer is used to provide the measurement line voltage through the principle of electromagnetic induction, which meets the design requirements of a single-phase electromagnetic voltage transformer in the power system, and provides a reference for the deep integration of medium-voltage carrier communication technology in primary and secondary integrated products. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 This is a circuit diagram of a medium-voltage carrier communication coupler circuit with electromagnetic induction power supply function provided by the present invention. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0026] Medium-voltage carrier communication technology utilizes existing 10kV distribution lines as transmission channels. It features features such as no need to re-lay communication lines, low investment, easy maintenance, zero operating costs, and dedicated network operation. It has been widely used in distribution automation and electricity consumption information collection. Because medium-voltage carrier communication carriers cannot withstand the high voltage of 10kV, they require a dedicated medium-voltage carrier communication coupler to connect to medium-voltage overhead lines. Because medium-voltage carrier communication carriers require separate wiring for power, they can generally only be connected directly to the power terminals of the distribution station concentrator or distribution terminal. This non-standard power supply method poses a safety risk to electricity use. Separately installing electromagnetic voltage transformers can easily lead to complex and wasteful equipment in the distribution station. In addition, with the construction of distribution automation, the State Grid mainly promotes primary and secondary integrated equipment sets. The power terminals all use standard aviation plug terminals, and it is difficult to obtain power for medium-voltage carrier communication carrier machines. The best way to apply medium-voltage carrier communication technology is to deeply integrate it with primary and secondary integrated products without changing the original standard interface design. Among them, it is necessary to consider how to achieve deep integration of medium-voltage carrier communication couplers and electromagnetic voltage transformers.

[0027] In order to solve the above technical problems, the purpose of the present invention is to provide a medium voltage carrier communication coupler circuit with electromagnetic induction power supply function. Figure 1 The circuit diagram of a medium voltage carrier communication coupler circuit with electromagnetic induction power supply function provided by the present invention is as follows: Figure 1 As shown, it includes a first fuse F1, a second fuse F2, a first transformer T1, a first inductor L1, a second capacitor C2, a second transformer T2, a first capacitor C1, a first gas discharge tube G1, and a second gas discharge tube G2;

[0028] The first end of the first fuse F1 is connected to the first high-voltage terminal GY1, and the second end of the first fuse F1 is connected to the first end of the primary side of the first transformer T1;

[0029] A first end of the second fuse F2 is connected to the second high-voltage terminal GY2, and a second end of the second fuse F2 is connected to the second end of the primary side of the first transformer T1;

[0030] It should be noted that the first fuse F1 and the second fuse F2 are used for failure protection. When the first capacitor C1 and the first transformer T1 fail, they can be quickly blown to avoid causing a continuous fault.

[0031] A first end of the secondary first winding of the first transformer T1 is connected to the measurement line voltage terminal CLXDY, a second end of the secondary first winding of the first transformer T1 is connected to the common ground terminal DGND, a first end of the secondary second winding of the first transformer T1 is connected to the first end of the first inductor L1, and a second end of the secondary second winding of the first transformer T1 is connected to the common ground terminal DGND;

[0032] It should be noted that the first transformer T1 converts the AC high voltage into the required AC measurement line voltage and AC power supply voltage according to the transformation ratio based on the principle of electromagnetic induction;

[0033] The second end of the first inductor L1 is connected to the power supply voltage / carrier communication terminal GDDY / ZBTX;

[0034] It should be noted that, according to the effect that the higher the frequency, the greater the inductive reactance, the first inductor L1 reduces the shunting of the carrier communication signal through the first transformer T1, thereby reducing the attenuation of the carrier communication signal.

[0035] A first end of the second capacitor C2 is connected to the power supply voltage / carrier communication terminal GDDY / ZBTX, and a second end of the second capacitor C2 is connected to a first end of the secondary side of the second transformer T2;

[0036] It should be noted that the second capacitor C2 is used to isolate the power frequency power supply voltage to achieve multiplexing of the power supply voltage and the carrier communication interface.

[0037] The second end of the secondary side of the second transformer T2 is connected to the common ground terminal DGND, the first end of the primary side of the second transformer T2 is connected to the second end of the first capacitor C1, and the second end of the primary side of the second transformer T2 is connected to the ground terminal GND;

[0038] It should be noted that the second transformer T2 is used for secondary power frequency isolation and carrier signal coupling.

[0039] The first end of the first capacitor C1 is connected to the second end of the second fuse F2;

[0040] It should be noted that the first capacitor C1 is used to isolate the power frequency high voltage.

[0041] The first gas discharge tube G1 is connected in parallel between the primary sides of the second transformer T2;

[0042] The second gas discharge tube G2 is connected in parallel between the secondary sides of the second transformer T2;

[0043] It should be noted that the first gas discharge tube G1 and the second gas discharge tube G2 are used for transient overvoltage protection.

[0044] According to the above embodiment, preferably, the first fuse F1 and the second fuse F2 are high-voltage current-limiting fuses;

[0045] A high-voltage current-limiting fuse is installed in a circuit, connecting the two ends of the circuit via an internal silver fuse. When the current in the circuit exceeds the set limit of the high-voltage current-limiting fuse, the fuse heats up and melts, thus disconnecting the circuit. This is the main function of the high-voltage current-limiting fuse.

[0046] According to the above embodiment, preferably, the first transformer T1 is a medium voltage power frequency transformer;

[0047] A medium voltage power frequency transformer refers to a power frequency transformer with a rated input voltage of up to 10kV. It uses a high-quality iron core and is supplemented by pure copper windings. It can provide high-power output power supply voltage and high-precision measurement of line voltage.

[0048] According to the above embodiment, preferably, the first inductor L1 is a high-frequency reactor;

[0049] The high-frequency reactor uses high-quality manganese-zinc ferrite magnetic rings, with an operating frequency of up to 2MHz. The impedance to the power frequency voltage is only at the mΩ level, and the impedance to the carrier communication signal can reach more than 100 kΩ, which can play a good wave blocking role.

[0050] According to the above embodiment, preferably, the second capacitor C2 is a metal film safety capacitor;

[0051] Metal film safety capacitors have good voltage resistance, high impedance to power frequency voltage, and low impedance to high-frequency carrier communication signals. They can effectively isolate power frequency voltage signals. In addition, metal film safety capacitors will be in an open circuit state after failure and will not harm subsequent devices.

[0052] According to the above embodiment, preferably, the second transformer T2 is a high-frequency transformer;

[0053] The high-frequency transformer adopts high-quality manganese-zinc ferrite magnetic ring, the operating frequency can reach 2MHz, and it adopts high-grade insulated wire in parallel winding, with small leakage inductance, good insulation performance and small size. It can play a good role in secondary power frequency withstand voltage and has minimal loss to carrier communication signals.

[0054] According to the above embodiment, preferably, the first capacitor C1 is a high-voltage ceramic capacitor;

[0055] High-voltage ceramic capacitors have high voltage resistance, low loss, good frequency characteristics, high stability, large insulation resistance, and long service life. They have been widely used in power systems.

[0056] The above is a detailed introduction to a medium-voltage carrier communication coupler circuit with electromagnetic induction power supply function provided by the present invention. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified in several ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0057] It should also be noted that, in this specification, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

Claims

1. A medium voltage carrier communication coupler circuit with electromagnetic induction power supply function, comprising: A first fuse, a second fuse, a first transformer, a first inductor, a second capacitor, a second transformer, a first capacitor, a first gas discharge tube, and a second gas discharge tube; The first end of the first fuse is connected to the first high-voltage end, and the second end of the first fuse is connected to the first end of the primary side of the first transformer; The first end of the second fuse is connected to the second high-voltage terminal, and the second end of the second fuse is connected to the second end of the primary side of the first transformer; A first end of the secondary first winding of the first transformer is connected to a measurement line voltage terminal, a second end of the secondary first winding of the first transformer is connected to a common ground terminal, a first end of the secondary second winding of the first transformer is connected to a first end of the first inductor, and a second end of the secondary second winding of the first transformer is connected to a common ground terminal; The second end of the first inductor is connected to the power supply voltage / carrier communication end; A first end of the second capacitor is connected to the power supply voltage / carrier communication end, and a second end of the second capacitor is connected to the first end of the secondary side of the second transformer; The second end of the secondary side of the second transformer is connected to the common ground, the first end of the primary side of the second transformer is connected to the second end of the first capacitor, and the second end of the primary side of the second transformer is connected to the ground; A first end of the first capacitor is connected to a second end of the second fuse; The first gas discharge tube is connected in parallel between the primary sides of the second transformer; The second gas discharge tube is connected in parallel between the secondary sides of the second transformer.

2. A medium voltage carrier communication coupler circuit with electromagnetic induction power supply function according to claim 1, characterized in that: The first fuse and the second fuse are high-voltage current-limiting fuses.

3. The medium voltage carrier communication coupler circuit with electromagnetic induction power supply function according to claim 1, characterized in that: The first transformer is a medium voltage power frequency transformer.

4. The medium voltage carrier communication coupler circuit with electromagnetic induction power supply function according to claim 1, characterized in that: The first inductor is a high-frequency reactor.

5. The medium voltage carrier communication coupler circuit with electromagnetic induction power supply function according to claim 1, characterized in that: The second capacitor is a metal film safety capacitor.

6. The medium voltage carrier communication coupler circuit with electromagnetic induction power supply function according to claim 1, characterized in that: The second transformer is a high-frequency transformer.

7. The medium voltage carrier communication coupler circuit with electromagnetic induction power supply function according to claim 1, characterized in that: The first capacitor is a high-voltage ceramic capacitor.

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