Double-net structure external SVG compensation cabinet matched with JP cabinet

Abstract

The utility model discloses a kind of double-net interface structure external SVG compensation cabinet used with JP cabinet, still include low-voltage comprehensive distribution box, intelligent capacitor, sampling CT, SVG outdoor box is external, by box, miniature circuit breaker, static var generator, cabinet temperature controller, fan, fuse, high protection heavy aviation plug, high protection RJ45 communication plug-in, RJ45 communication connection line is formed, each component orderly connects, integrated in an outdoor box body.The utility model uses high protection RJ45 communication plug-in and RJ45 communication connection line, double-net interface is connected with intelligent capacitor and sampling CT respectively, ensure the stability and accuracy of data transmission, conducive to realizing accurate control and real-time monitoring to equipment.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, specifically to an external SVG compensation cabinet with a dual network port structure used in conjunction with a JP cabinet. Background Technology

[0002] Most existing SVG outdoor enclosures adopt an integrated structure, with the SVG built into the JP cabinet. The limited space inside the JP cabinet makes it difficult to effectively dissipate the heat generated when the SVG is running at full power. Even within the cabinet's space constraints, prolonged operation in a high-temperature environment accelerates the aging of the SVG's internal electronic components, reducing their lifespan and reliability, and increasing the probability of failure. Installing the SVG within the limited space of the JP cabinet may require special cabinet design and manufacturing, while also considering issues such as heat dissipation and electromagnetic compatibility, which increases the equipment's manufacturing cost. Furthermore, subsequent maintenance costs are also increased due to the aforementioned inconvenience in maintenance. Utility Model Content

[0003] The technical problem to be solved is to address the problems existing in the prior art. The purpose of this utility model is to provide an external SVG compensation cabinet with a dual network port structure that can be used in conjunction with a JP cabinet.

[0004] Technical solution: To solve the above problems, the present invention adopts the following technical solution.

[0005] An external SVG compensation cabinet with a dual-network port structure, used in conjunction with a JP cabinet, includes a low-voltage integrated distribution box, a smart capacitor, a sampling CT, an external SVG outdoor box, a secondary CT and communication circuit, and a primary busbar, all connected to the low-voltage integrated distribution box via aviation connectors. The SVG outdoor box is connected to the smart capacitor's communication interface via one network cable and to the sampling CT via another network cable. The smart capacitor is part of the low-voltage integrated distribution box, and the sampling CT is installed in the circuit of the low-voltage integrated distribution box. The cabinet is characterized by: a cabinet body, a miniature circuit breaker, a static var generator, a cabinet temperature controller, a fan, fuses, a high-protection heavy-duty aviation connector, a high-protection RJ45 communication plug, and an RJ45 communication cable. All components are connected in an orderly manner and integrated into an outdoor cabinet. The cabinet body is the outer shell, and the static var generator is installed inside the cabinet and connected to other components via internal wiring. The miniature circuit breaker and fuses are connected to the circuit, and the secondary CT is installed in the JP cabinet. The main incoming busbar or the outgoing terminal of the low-voltage integrated distribution box inside the cabinet is close to the key node of the primary main circuit. The high-protection heavy-duty aviation plug achieves electrical connection with external equipment through aviation plug-in. The high-protection RJ45 communication plug is a dual network port connection. It is connected to the intelligent capacitor interface and the sampling CT respectively through the RJ45 communication connection cable.

[0006] Furthermore, both ends of the RJ45 communication cable are equipped with RJ45 connectors. The metal pins inside the connectors are arranged in a specific wire sequence. There are two high-protection RJ45 communication plugs. One end of one RJ45 communication cable is connected to one of the high-protection RJ45 communication plugs, and the other end is connected to the 485 communication interface of the smart capacitor for transmitting control signals. One end of the other RJ45 communication cable is connected to the other high-protection RJ45 communication plug, and the other end is connected to the sampling CT.

[0007] Furthermore, the miniature circuit breaker and the fuse are connected in series, with the miniature circuit breaker located near the power supply side and the fuse located behind the miniature circuit breaker.

[0008] Furthermore, a zinc oxide surge arrester is installed at the power input terminal of the SVG, and an overvoltage monitoring circuit is installed at the output terminal of the SVG.

[0009] Furthermore, each of the three-phase output circuits of the SVG is connected in series with a breaking capacity of not less than 50kA. Fast current limiting fuse.

[0010] The working principle of this utility model is as follows: During the operation of the power system, the electrical energy from the power source side first passes through a miniature circuit breaker located near the power source side. The miniature circuit breaker provides overload and short-circuit protection for the circuit, ensuring its safe operation. Next, the electrical energy passes through a fuse, which melts when the current is too high, further ensuring circuit safety. The static var generator (SVR) inside the SVG outdoor box plays a crucial role. Connected to other components via internal wiring, it can monitor the reactive power of the power system in real time. When the reactive power in the system is insufficient or excessive, the SVR can quickly generate or absorb reactive power to maintain system reactive power balance and stabilize voltage. The intelligent capacitor, as part of the low-voltage integrated distribution box, is connected to the SVG outdoor box via an RJ45 communication cable and a high-protection RJ45 communication plug-in. It receives control signals transmitted from the SVG outdoor box, thereby adjusting its own operating state and achieving refined control of reactive power compensation in the power system. The sampling CT is installed in the low-voltage integrated distribution box circuit. It is also connected to the SVG outdoor box via an RJ45 communication cable and a high-protection RJ45 communication plug-in. It collects current and other parameter information in the circuit in real time and transmits this data to the SVG outdoor box, providing data support for the operation of the static var generator and enabling it to perform reactive power compensation operations more accurately.

[0011] The beneficial effects of this utility model are: 1. It integrates numerous components such as the enclosure, miniature circuit breaker, and static var generator into a single outdoor enclosure, resulting in a compact structure, small footprint, easy installation and maintenance, and effectively reduced equipment floor space. 2. The miniature circuit breaker and fuse are connected in series, with the miniature circuit breaker located near the power supply side and the fuse positioned behind it, forming a dual circuit protection mechanism. This effectively addresses overload, short circuit, and other faults, improving equipment reliability and lifespan. 3. It employs a high-protection RJ45 communication plug-in and RJ45 communication cable, with dual network ports connecting the intelligent capacitor and sampling CT respectively, ensuring the stability and accuracy of data transmission and facilitating precise control and real-time monitoring of the equipment. Attached Figure Description

[0012] Figure 1 is a schematic diagram of the overall structure of this utility model.

[0013] Figure 2 is a cross-sectional schematic diagram of the SVG compensation cabinet of this utility model.

[0014] Figure 3 This is a side view of the SVG compensation cabinet of this utility model.

[0015] Figure 4 This is a schematic diagram of the overall principle of this utility model.

[0016] The components in the diagram are named as follows: 1. Cabinet; 2. Miniature circuit breaker; 3. Static var generator; 4. Cabinet temperature controller; 5. Fan; 6. Fuse; 7. High-protection heavy-duty aviation connector; 8. High-protection RJ45 communication plug; 9. Secondary CT; 10. Capacitor; 11. Current transformer. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0018] An external SVG compensation cabinet with a dual-network port structure, used in conjunction with a JP cabinet, includes a low-voltage integrated distribution box, a smart capacitor, a sampling CT, an external SVG outdoor box, a secondary CT9 and communication circuit, and a primary busbar, all connected to the low-voltage integrated distribution box via aviation connectors. The SVG outdoor box is connected to the smart capacitor communication interface via one network cable and to the sampling CT via another network cable. The smart capacitor is part of the low-voltage integrated distribution box, and the sampling CT is installed in the circuit of the low-voltage integrated distribution box. The cabinet is characterized by: a cabinet body 1, a miniature circuit breaker 2, a static var generator 3, a cabinet temperature controller 4, a fan 5, a fuse 6, a high-protection heavy-duty aviation connector 7, a high-protection RJ45 communication plug 8, and an RJ45 communication cable. All components are connected in an orderly manner and integrated into an outdoor cabinet. The cabinet body 1 is the outer shell, the static var generator 3 is installed inside the cabinet and connected to other components via internal wiring, the miniature circuit breaker 2 and the fuse 6 are connected to the circuit, and the secondary CT9 is installed in the JP cabinet. The main incoming busbar or the outgoing terminal of the low-voltage integrated distribution box inside the cabinet is close to the key node of the primary main circuit. The high-protection heavy-duty aviation plug 7 achieves electrical connection with external equipment through aviation plug-in. The high-protection RJ45 communication plug 8 is a dual network port connection, which is connected to the intelligent capacitor interface and the sampling CT respectively through the RJ45 communication connection cable.

[0019] Furthermore, both ends of the RJ45 communication cable are equipped with RJ45 connectors. The metal pins inside the connectors are arranged in a specific wire sequence. There are two high-protection RJ45 communication plugs. One end of one RJ45 communication cable is connected to one of the high-protection RJ45 communication plugs, and the other end is connected to the 485 communication interface of the smart capacitor for transmitting control signals. One end of the other RJ45 communication cable is connected to the other high-protection RJ45 communication plug, and the other end is connected to the sampling CT.

[0020] Furthermore, the miniature circuit breaker and the fuse are connected in series, with the miniature circuit breaker located near the power supply side and the fuse located behind the miniature circuit breaker.

[0021] Furthermore, a zinc oxide surge arrester is installed at the power input terminal of the SVG, and an overvoltage monitoring circuit is installed at the output terminal of the SVG.

[0022] Furthermore, each of the three-phase output circuits of the SVG is connected in series with a breaking capacity of not less than 50kA. Fast current limiting fuse.

[0023] This utility model employs electrical safety and protection: Overvoltage protection: A zinc oxide surge arrester is added to the power input terminal of the Static Var Generator (SVG). The rated voltage should match the system voltage (e.g., a 1kV surge arrester should be selected for a 0.4kV system). This effectively absorbs operational overvoltages and lightning overvoltages, preventing overvoltage from damaging the internal power devices of the SVG. Simultaneously, an overvoltage monitoring circuit is installed at the SVG output terminal. When the output voltage exceeds 1.2 times the rated value, the miniature circuit breaker is immediately triggered to trip, disconnecting the power supply protection equipment. Enhanced overcurrent protection: In addition to the existing miniature circuit breakers and fuses, a fast-acting current-limiting fuse (breaking capacity not less than 50kA) is connected in series in each of the three-phase output circuits of the SVG, forming a two-stage protection system with the miniature circuit breakers. The miniature circuit breakers are responsible for long-delay overload protection, while the fast-acting fuses are responsible for instantaneous short-circuit protection. The combination of the two can cover a wider range of fault currents and improve protection reliability. Surge suppression: A power surge suppressor is installed at the input end of the high-protection heavy-duty aviation connector, using a T2-class surge protector (Imax≥40kA) to reduce transient overvoltages conducted to the SVG by discharging surge current. The surge suppressor should have remote alarm functionality, uploading the degradation status to the monitoring system via a communication line. Grounding protection: The enclosure is equipped with an independent grounding terminal, which is reliably connected to the JP cabinet grounding system using a copper grounding wire with a cross-sectional area of ​​not less than 16mm², and the grounding resistance is ≤4Ω. All metal components inside the SVG (such as the cabinet frame and equipment shell) are connected to the grounding busbar inside the enclosure through grounding branch lines to form an equipotential bond and prevent the risk of electric shock caused by leakage. Phase loss protection: A three-phase voltage detection module is installed on the power input side. When any phase is missing or the voltage is lower than 70% of the rated value, the SVG control power supply is immediately cut off and an alarm signal is issued to prevent the SVG from operating in a phase loss state and causing equipment damage. Over-temperature protection: In addition to the cabinet temperature controller, a PT100 temperature sensor is attached to the surface of the SVG power module to monitor the temperature of core components in real time. When the temperature exceeds 65℃, the temperature controller starts the fan for strong cooling; when it exceeds 80℃, the SVG is forced to operate at reduced capacity; when it exceeds 90℃, the main circuit is directly cut off to ensure that the equipment operates within a safe temperature range. This utility model employs the following communication and control device: Dual-port redundancy design: Two high-protection RJ45 communication plugs use independent physical links and communication protocol stacks, supporting both TCP / IP and MODBUS-RTU protocols. When communication is interrupted in one port (such as a broken network cable or interface failure), the system automatically switches to the other port to transmit data, with a switching time of ≤50ms, ensuring communication continuity. Anti-interference measures: The RJ45 communication cable uses a shielded Cat5e network cable, with both ends of the shield connected to the plug-in housing via metal rings to achieve 360° grounding. When routing the communication line inside the enclosure, it is kept away from high-voltage circuits (distance ≥30cm) and protected by corrugated metal conduit to reduce the impact of electromagnetic interference on the communication signal. Encrypted data transmission: During communication between the SVG, smart capacitor, and sampling CT, the AES-128 encryption algorithm is used to encrypt the transmitted data to prevent data tampering or eavesdropping. A CRC checksum is added to the communication frame format to ensure the integrity of data transmission. Remote monitoring interface: A 4G / 5G wireless communication module is added inside the enclosure, connecting to the SVG control unit via a high-protection RJ45 plug. This allows SVG operating data (such as reactive power compensation, voltage, current, temperature, etc.) to be uploaded to a cloud monitoring platform. Remote parameter setting, fault diagnosis, and software upgrades are supported without on-site operation. Synchronous sampling function: A synchronous pulse signal line is added between the sampling CT and SVG to ensure that the reactive power compensation calculation of SVG is strictly synchronized with the sampling of grid voltage and current (phase error ≤1°), thereby improving the compensation accuracy and avoiding harmonic amplification. This utility model adopts a design that enhances structural and environmental adaptability: Upgraded enclosure protection: The enclosure is made of cold-rolled steel plate with a thickness of ≥2mm, which is pickled and phosphated and then sprayed with outdoor-specific powder coating, achieving an IP55 protection rating (resistant to short-term rain and dust intrusion). Weather-resistant silicone rubber sealing strips are installed at the connection between the door and the enclosure, the door frame is equipped with rainproof folded edges, and a rainproof eave with a slope of ≥15° and an extension length of ≥100mm is added to the top. Optimized heat dissipation structure: Louvered ventilation holes are opened on both sides of the enclosure, and dustproof mesh (mesh diameter ≤0.8mm) and waterproof and breathable membrane are installed on the inside, which can ensure air circulation and prevent rainwater from entering. The fan adopts axial flow fan (air volume ≥800m³ / h), which is installed at the air outlet on the top of the enclosure to form a forced cooling air duct with bottom inlet and top outlet, improving the heat dissipation efficiency by 30%. Aviation connector selection: High-protection heavy-duty aviation connectors are selected with IP68 protection rating. The pins are gold-plated (thickness ≥5μm), featuring an anti-misinsertion structure and mechanical locking device, and a mating life ≥500 cycles. The connector-to-cable connection is sealed with vulcanized rubber, which can withstand ambient temperature variations from -40℃ to 85℃. Seismic resistance and mounting: The static var generator is fixed to the internal steel support frame via anti-vibration pads (hardness 50 Shore A), and the support frame is rigidly connected to the bottom of the enclosure with bolts. All internal wiring is fixed with metal cable trays, and stress relief devices are installed at both ends of the cables, meeting the seismic requirements for transportation and installation (earthquake intensity 7) specified in GB / T 17752-1999. This utility model adopts intelligent management: Status Indicators and Alarms: The enclosure panel features a three-color LED indicator (green: normal operation; yellow: alarm; red: fault) and a buzzer to locally indicate the equipment's operating status. It also has a built-in LCD display that can show key parameters such as SVG output current, compensation capacity, and temperature in real time, and supports button-based querying of historical fault records (stores ≥100 entries). Self-diagnostic function: The SVG control unit has a hardware self-test function, which can automatically detect the health status of components such as power modules, communication interfaces, and sensors. When potential problems such as wind turbine failure or capacitor aging are detected, an early warning signal is issued to facilitate planned maintenance by operation and maintenance personnel. Modular design: Internal components adopt a modular layout. Vulnerable parts such as miniature circuit breakers, fuses, and aviation connectors are centrally located near the maintenance window, allowing for disassembly and replacement without moving the core equipment. The SVG power module supports hot-swapping, with a replacement time of ≤15 minutes, reducing downtime for maintenance. Anti-misoperation design: The cabinet door is equipped with a mechanical interlock device, which can only be opened after the miniature circuit breaker has been tripped; the aviation plug adopts a "break before make" structure to ensure that the power supply is cut off before the signal is disconnected when plugging or unplugging, so as to avoid safety accidents caused by live operation. Extended environmental adaptability: A temperature and humidity sensor is installed inside the enclosure. When the humidity exceeds 85% RH, the heating and dehumidification device (power ≤300W) is automatically activated to prevent condensation from reducing the insulation of the equipment. Suitable for outdoor environments from -30℃ to +55℃, meeting the high and low temperature and damp heat test requirements of GB / T 2423 series standards.

Claims

1. A dual-network-port external SVG compensation cabinet for use with a JP cabinet, comprising a low-voltage integrated distribution box, a smart capacitor, a sampling CT, an externally mounted SVG outdoor box, a secondary CT and communication circuit, and a primary busbar, all connected to the low-voltage integrated distribution box via aviation connectors. The SVG outdoor box is connected to the smart capacitor's communication interface via one network cable and to the sampling CT via another network cable. The smart capacitor is part of the low-voltage integrated distribution box, and the sampling CT is installed in the circuit of the low-voltage integrated distribution box. Its features are: It consists of a cabinet, miniature circuit breaker, static var generator, cabinet temperature controller, fan, fuse, high-protection heavy-duty aviation connector, high-protection RJ45 communication plug, and RJ45 communication cable. The components are connected in an orderly manner and integrated into an outdoor cabinet. The cabinet is the outer shell, and the static var generator is installed inside the cabinet. The miniature circuit breaker and fuse are connected to the circuit. The secondary CT is installed inside the JP cabinet on the main incoming busbar or the outgoing terminal of the low-voltage integrated distribution box, close to the key node of the primary main circuit. The high-protection heavy-duty aviation connector realizes the electrical connection with external equipment through aviation connector. The high-protection RJ45 communication plug is a dual network port connection, which is connected to the intelligent capacitor interface and the sampling CT respectively via the RJ45 communication cable.

2. The external SVG compensation cabinet with dual network ports used in conjunction with a JP cabinet according to claim 1, characterized in that: Both ends of the RJ45 communication cable are equipped with RJ45 connectors. The metal pins inside the connectors are arranged in the wire sequence. There are two high-protection RJ45 communication plugs. One end of one RJ45 communication cable is connected to one of the high-protection RJ45 communication plugs, and the other end is connected to the 485 communication interface of the smart capacitor for transmitting control signals. One end of the other RJ45 communication cable is connected to the other high-protection RJ45 communication plug, and the other end is connected to the sampling CT.

3. The external SVG compensation cabinet with dual network ports used in conjunction with a JP cabinet according to claim 1, characterized in that: The miniature circuit breaker and the fuse are connected in series, with the miniature circuit breaker located near the power supply side and the fuse located at the rear of the miniature circuit breaker.

4. The external SVG compensation cabinet with dual network ports used in conjunction with a JP cabinet according to claim 1, characterized in that: A zinc oxide surge arrester is installed at the power input terminal of the SVG, and an overvoltage monitoring circuit is installed at the output terminal of the SVG.

5. The external SVG compensation cabinet with dual network ports used in conjunction with a JP cabinet according to claim 1, characterized in that: In each of the three-phase output circuits of the SVG, a fast current-limiting fuse with a breaking capacity of not less than 50kA is connected in series.

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