Three-phase cable electricity taking device

Abstract

The utility model provides a three-phase cable power taking device which is used for extracting a low-voltage power supply from a three-phase cable. The device comprises three universal cable suites and a low-voltage output unit. The input end of the universal cable suite is connected with one phase of the three-phase cable, the output end of the universal cable suite is connected with the input end of the low-voltage output unit, the suite comprises a high-voltage capacitor, an electrical connecting piece and a shell, and electric energy is extracted through the voltage dividing function of the high-voltage capacitor and transmitted to the low-voltage output unit. And the low-voltage output unit comprises a transformer, a rectifying and voltage-stabilizing unit and a protection unit, converts high-voltage electric energy into stable low-voltage direct current and provides multiple protection. The beneficial effects of the utility model lie in that the power supply can reduce the voltage of the electric energy in the high-voltage cable and stably output the electric energy, ensure the normal operation of the circuit, provide overvoltage, impact resistance and partial discharge suppression protection, adapt to different working environments, have higher output power, and meet the requirements of various low-voltage power supplies.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power equipment, in particular to a three-phase cable power taking device. Background Art

[0002] With the deepening of the distribution network automation transformation, a large number of secondary devices have been put into use, but their power supply problem has always been a difficult problem to be solved. Traditional energy-taking transformers are not only costly and occupy a large space, but also very difficult to directly install transformers in equipment such as ring main units with limited space and fully insulated structures. Especially for ring main units that have been put into operation, it is difficult and costly to add traditional energy-taking devices.

[0003] The space inside the ring main cabinet is limited, and the fully insulated structure is not suitable for direct installation of traditional transformers. Traditional energy extraction devices have the problem of low power supply and cannot meet the power supply needs of a large number of secondary devices. In addition, traditional energy extraction methods mostly extract energy through current, but this method has an energy extraction "dead zone", resulting in unstable power supply and difficulty in ensuring continuous and reliable operation of equipment.

[0004] Therefore, a new solution is needed that can overcome the limitations of traditional energy extraction methods under existing conditions, provide sufficient power supply, and ensure the stability and reliability of power supply. Utility Model Content

[0005] In order to overcome the above problems, the utility model proposes a three-phase cable power taking device.

[0006] The utility model provides a three-phase cable power taking device, comprising:

[0007] Three universal cable kits and a low-voltage output unit; the input end of each universal cable kit is connected to one phase of the three-phase cable, the output end is connected to the input end of the low-voltage output unit, and the output end of the low-voltage output unit is connected to the load.

[0008] Specifically, the universal cable kit includes a capacitor, an electrical connector and a housing; one end of the electrical connector is connected to the cable, and the other end is connected to the capacitor; the capacitor is wrapped by the housing, and the other end of the capacitor is connected to the input end of the low-voltage output unit.

[0009] Furthermore, the capacitor is a cylindrical capacitor.

[0010] Specifically, the electrical connector is provided with a penetrating circular hole.

[0011] Furthermore, the electrical connector is made of copper.

[0012] Specifically, the shell includes a silicone rubber jacket, an epoxy tube, epoxy resin, semi-conductive silicone rubber and an aluminum alloy base; the silicone rubber jacket, epoxy tube and epoxy resin are arranged on the upper part of the universal cable kit close to the input end of the universal cable kit, and are arranged in sequence from the outside to the inside, and the epoxy resin wraps the capacitor; the semi-conductive silicone rubber is arranged in the middle part of the universal cable kit close to the output end of the universal cable kit; the aluminum alloy base is arranged at the output end of the universal cable kit and is connected to the semi-conductive silicone rubber.

[0013] Furthermore, the low-voltage output unit includes a transformer, a rectifying and voltage-stabilizing unit and a protection unit; the protection unit is connected in series with the primary of the transformer, one end of the protection unit and the primary of the transformer is connected to the output end of the universal cable kit, and the other end of the protection unit and the primary of the transformer is grounded; the secondary of the transformer is connected to the input end of the rectifying and voltage-stabilizing unit, and the output end of the rectifying and voltage-stabilizing unit is connected to a load.

[0014] Specifically, the protection unit includes an anti-shock protection subunit, a partial discharge suppression subunit and an overvoltage protection subunit; the anti-shock protection subunit, the partial discharge suppression subunit and the overvoltage protection subunit are connected in sequence, and the output end of the overvoltage protection subunit is connected to the primary of the transformer.

[0015] The beneficial effects of the utility model are as follows:

[0016] The three-phase cable power supply device of the utility model has a compact structure, is flexible, and is easy to install without destroying the original design. In particular, for equipment that has already been put into operation, the device can be installed in the existing space without changing the original equipment or taking up new space, which saves costs for users and reduces the difficulty of construction, so that many equipment that originally did not meet the conditions for transformation can also obtain low-voltage power supply. In terms of power, the power of each phase of the utility model is greater than 10W, and the power after the three-phase synthesis is greater than 30W, which can provide a stable and reliable power supply for various equipment. Furthermore, the maximum single-phase power of 20W and the three-phase power of 60W can be achieved at present, and stable power output can still be provided in the event of system faults such as single-phase grounding and phase loss.

[0017] Secondly, the device is equipped with a universal cable kit, which solves the installation difficulties caused by the various manufacturers and sizes of cable kits on site. Through the standardized cable kit design, the adaptability and installation success rate of the device are improved, and the on-site power outage time, construction difficulty and risk of construction failure are reduced.

[0018] In addition, the device saves materials, is energy-efficient and environmentally friendly, and reduces the use of copper and iron, thereby reducing copper loss, iron loss and self-loss. This design reduces the accident rate of ferromagnetic resonance failures in the line due to iron core mutual inductors, and improves the overall reliability and safety of the system.

[0019] In summary, the three-phase cable power supply device of the present invention provides a new solution for obtaining low-voltage power supply for various electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a three-phase cable power taking device in one embodiment of the utility model;

[0021] Figure 2 It is a schematic diagram of the circuit structure of a three-phase cable power taking device in one embodiment of the utility model.

[0022] Markings in the figure: 1. Electrical connector, 2. Silicone rubber jacket, 3. Epoxy tube, 4. Epoxy resin, 5. High-voltage capacitor, 6. Semi-conductive silicone rubber, 7. Aluminum alloy base, 8. Low-voltage output unit. DETAILED DESCRIPTION

[0023] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the described embodiments are only used to explain the technical principles of the utility model, rather than to limit its protection scope. Those skilled in the art should understand that, without departing from the spirit and scope of the utility model, these embodiments can be subjected to various transformations, modifications or equivalent substitutions. These transformations, modifications or equivalent substitutions should all be deemed to fall within the protection scope defined by the claims of the utility model.

[0024] like Figure 1 As shown, this embodiment provides a three-phase cable power extraction device, which is mainly used to extract low-voltage power from a three-phase cable. The device includes three universal cable kits and a low-voltage output unit 8. The input end of each universal cable kit is respectively connected to one phase of the three-phase cable, and the output end is connected to the input end of the low-voltage output unit 8. The universal cable kit consists of a high-voltage capacitor 5, an electrical connector 1 and a housing.

[0025] In the device, one end of the electrical connector 1 is connected to the three-phase cable, and the other end is connected to the high-voltage capacitor 5. The electrical connector 1 is made of copper, has good electrical conductivity and durability, and is provided with a through round hole to enhance the stability of the connection and the electrical contact performance. During the operation of the device, when the three-phase cable is energized, the high-voltage capacitor 5 extracts electrical energy from the three-phase cable through its voltage dividing function. The high-voltage capacitor 5 is wrapped by the shell, which is composed of a silicone rubber jacket 2, an epoxy tube 3, an epoxy resin 4, a semi-conductive silicone rubber 6 and an aluminum alloy base 7. These materials are arranged in sequence from the outside to the inside, and the epoxy resin 4 wraps the high-voltage capacitor 5 to provide insulation and protection. The semi-conductive silicone rubber 6 is arranged in the middle of the universal cable set, close to the output end, and plays the role of shielding and uniform electric field. The aluminum alloy base 7 is located at the output end and is fixedly connected to the semi-conductive silicone rubber 6 to provide a solid mechanical support and conductive path.

[0026] The function of the high-voltage capacitor 5 is to reduce a wide range of high voltage to a suitable low voltage, so that the subsequent circuit can have a suitable working condition. Since the high-voltage capacitor 5 is a cylindrical structure, it can provide a larger coupling area and improve the efficiency of power extraction. The extracted power is transmitted to the low-voltage output unit 8 through the electrical connector 1.

[0027] like Figure 2 As shown, the low-voltage output unit 8 includes a transformer, a rectifier and a voltage regulator unit, and a protection unit. The primary side of the transformer is connected in series with the protection unit, one end of the primary side is connected to the output end of the universal cable kit, and the other end is grounded. The transformer is used to convert the high-voltage electric energy provided after capacitor voltage division into electric energy suitable for low-voltage output. The secondary side of the transformer is connected to the input end of the rectifier and voltage regulator unit, and the rectifier and voltage regulator unit is responsible for converting AC power into DC power and stabilizing the output voltage to meet the load demand.

[0028] It should be noted that, in the present embodiment, the number of the low-voltage output units 8 is set to one to meet the power requirements of the current design. However, in other embodiments, the number of the low-voltage output units 8 can also be set to three. At this time, the output end of each universal cable kit can be connected to the input end of three independent low-voltage output units 8, respectively, so as to realize independent power supply to multiple low-voltage output units 8. In addition, other structures and connection methods remain unchanged to ensure the consistency of the overall function and performance of the device. Through such a configuration, the device can flexibly adapt to different application requirements and provide stable low-voltage power output for multiple devices or systems.

[0029] like Figure 2As shown, the protection unit includes an anti-shock protection subunit, a partial discharge suppression subunit and an overvoltage protection subunit, which are connected in sequence to ensure that the circuit is safe and reliable. The anti-shock protection subunit prevents the impact of sudden current changes on the equipment; the partial discharge suppression subunit is used to suppress local discharge and protect the insulation of the equipment; the overvoltage protection subunit prevents damage to the equipment due to excessive voltage. The anti-shock protection circuit can prevent large voltage swings caused by single-phase grounding and other phenomena during high-voltage bus and switch testing and actual working processes, and effectively protect the circuit. The partial discharge suppression circuit is used to start when the partial discharge conditions are met, eliminate partial discharge, and prevent long-term damage to the insulation of the equipment. The overvoltage protection circuit is activated when it detects that the bus voltage is too high, so that the power supply circuit always works in a normal working state to ensure the normal operation of the circuit.

[0030] In the present utility model, the anti-impact protection subunit, the partial discharge suppression subunit and the overvoltage protection subunit can adopt mature technologies in the prior art, and the present utility model will not describe them in detail.

[0031] In the low-voltage output unit 8, the transformer converts the extracted high-voltage electric energy into electric energy suitable for low-voltage output. The secondary side of the transformer is connected to the rectifier and voltage regulator unit, which rectifies and stabilizes the AC power output by the transformer, and provides a stable DC output for use by the load. At the same time, the transformer also realizes electrical isolation between the primary side and the secondary side to ensure the safety of subsequent equipment and personnel.

[0032] Similarly, in the present invention, the rectifying and voltage-stabilizing unit may also adopt mature technology in the prior art, which will not be described in detail in the present invention.

[0033] The three-phase cable power extraction device in this embodiment effectively reduces a wide range of high voltage voltage to a suitable low voltage by designing a high voltage capacitor 5, so that the subsequent circuit can work under safe and stable conditions. The high voltage capacitor 5 has a large coupling area, improves the power extraction efficiency, and ensures a stable supply of power.

[0034] Secondly, the transformer and the rectifier and voltage regulator unit work together to convert the electrical energy extracted from the high-voltage cable into a stable DC output. The transformer not only achieves voltage conversion, but also protects subsequent equipment and personal safety through electrical isolation. The rectifier and voltage regulator unit ensures the stability of the output voltage to meet various load requirements.

[0035] In addition, the protection unit provides multiple protection measures to ensure the safe operation of the device under various abnormal conditions. The anti-shock protection subunit effectively prevents the impact of current mutation on the equipment, the partial discharge suppression subunit suppresses the damage of partial discharge to the insulation of the equipment, and the overvoltage protection subunit provides protection when the voltage is too high to avoid damage to the equipment.

[0036] like Figure 2 As shown, in this embodiment, the rated working voltage of the three-phase cable power supply device is 10kV / √3, and it can operate stably in a high-voltage power environment. The device has a power frequency withstand voltage of 48kV and can last for 1 minute at this voltage, ensuring reliability under extreme conditions. At the same time, the device can withstand lightning strikes in the range of ±85kV, with an impulse waveform of 1.2μs / 20μs, providing effective overvoltage protection. The rated output voltage is 28.8V, with an allowable error of ±5%, and can be defined according to user needs. The rated output power of the device is not less than 10W, and the capacitive load is 300pF, ensuring sufficient energy supply.

[0037] In addition, the leakage current of the device is less than 10mA, ensuring the safety of power transmission. Its rated temperature rise is less than 20°

[0038] C, and can maintain low temperature rise even when running at high load. The operating temperature range is -40℃ to +70℃, suitable for various extreme environmental conditions. The device adapts to any altitude and has a waterproof rating of IP67, ensuring reliable operation in humid or watery environments. The design service life is not less than 20 years, reflecting the advantages of long-term stable operation.

[0039] To sum up, the three-phase cable power extraction device in this embodiment can not only effectively extract low-voltage power from the three-phase cable, and is suitable for various scenarios requiring low-voltage power, but also has high safety and stability, ensuring the safety of equipment and personnel, and has practical application value.

[0040] The utility model has been described in detail through the above specific implementation methods, but it should be understood that the above content is only illustrative and not used to limit the scope of the utility model. Ordinary technicians in this field can make various modifications and variations to the utility model according to specific application scenarios and actual needs without departing from the spirit and scope of the utility model, and these modifications and variations are all within the protection scope of the utility model.

Claims

1. A three-phase cable power supply device, characterized in that: It comprises three universal cable kits and a low-voltage output unit; the input end of each universal cable kit is respectively connected to one phase of the three-phase cable, the output end is connected to the input end of the low-voltage output unit, and the output end of the low-voltage output unit is connected to the load.

2. The three-phase cable power taking device according to claim 1, characterized in that: The universal cable kit includes a capacitor, an electrical connector and a housing; One end of the electrical connector is connected to the cable, and the other end is connected to the capacitor; the capacitor is wrapped by the shell, and the other end of the capacitor is connected to the input end of the low-voltage output unit.

3. The three-phase cable power taking device according to claim 2, characterized in that: The capacitor is a cylindrical capacitor.

4. The three-phase cable power taking device according to claim 2, characterized in that: The electrical connector is provided with a penetrating circular hole.

5. The three-phase cable power taking device according to claim 2, characterized in that: The electrical connector is made of copper.

6. The three-phase cable power taking device according to claim 2, characterized in that: The housing comprises a silicone rubber jacket, an epoxy tube, epoxy resin, semi-conductive silicone rubber and an aluminum alloy base; The silicone rubber jacket, epoxy tube and epoxy resin are arranged on the upper part of the universal cable kit near the input end of the universal cable kit, and are arranged in sequence from the outside to the inside, and the epoxy resin wraps the capacitor; The semi-conductive silicone rubber is arranged in the middle of the universal cable kit near the output end of the universal cable kit; The aluminum alloy base is arranged at the output end of the universal cable kit and is connected to the semi-conductive silicone rubber.

7. The three-phase cable power taking device according to claim 1, characterized in that: The low voltage output unit includes a transformer, a rectifying and voltage stabilizing unit and a protection unit; The protection unit is connected in series with the primary of the transformer, one end of the protection unit and the primary of the transformer is connected to the output end of the universal cable kit, and the other end of the protection unit and the primary of the transformer is grounded; The secondary of the transformer is connected to the input end of the rectifying and voltage-stabilizing unit, and the output end of the rectifying and voltage-stabilizing unit is connected to a load.

8. The three-phase cable power taking device according to claim 7, characterized in that: The protection unit includes an anti-shock protection subunit, a partial discharge suppression subunit and an overvoltage protection subunit; The anti-shock protection subunit, the partial discharge suppression subunit and the overvoltage protection subunit are connected in sequence, and the output end of the overvoltage protection subunit is connected to the primary of the transformer.

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