Cable branch box supporting load side electric energy quality management

Abstract

The utility model belongs to the technical field of cable branch boxes, and relates to a cable branch box supporting load side electric energy quality management, which comprises a box body, and an SVG static var generator, an isolating switch, a molded case circuit breaker, an emergency electricity taking interface and a wireless communication module are arranged in the box body. The molded case circuit breaker is electrically connected with the isolation switch and the emergency power taking interface. The SVG static var generator is electrically connected with the wireless communication module. The SVG static var generator comprises a static var generator body, a three-phase current transformer and a liquid crystal display screen. The three-phase current transformer is installed in a three-phase main incoming line loop in the box body. An SVG static var generator is additionally arranged, current data are collected through a current transformer, reactive current is calculated, the problem of electric energy quality is solved, and the data are sent to a main station through a communication module; emergency power supply is realized by accessing an external power supply through the emergency power-taking interface, and the power supply reliability is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cable branch boxes, and in particular relates to a cable branch box supporting load-side power quality management. Background Art

[0002] In the power system, the main function of the cable branch box is to branch or transfer cables, and it mainly plays the role of cable branching and cable transfer.

[0003] The cable branch box in the prior art has the following main deficiencies:

[0004] 1. There is no data recording and reporting mechanism, and the operating status of the equipment inside the cable branch box cannot be fed back in time, making fault analysis difficult;

[0005] 2. It is unable to compensate for reactive power, resulting in too low voltage and reduced power factor, making it impossible to ensure the provision of high-quality power quality;

[0006] 3. It does not have the functions of drawing power and charging in emergency situations, and cannot cope with the need to urgently supply power to large electrical equipment or use external power supply equipment to supply power in power outage areas. Summary of the Invention

[0007] This utility model designs a cable branch box that supports load-side power quality management to solve the technical problems existing in the above-mentioned background technology. The technical solutions adopted by this utility model are:

[0008] A cable branch box supporting load-side power quality management includes a box body, within which are arranged an SVG static VAR generator, an isolating switch, a molded case circuit breaker, an emergency power interface, and a wireless communication module; the molded case circuit breaker is electrically connected to the isolating switch and the emergency power interface, respectively; the SVG static VAR generator is electrically connected to the wireless communication module; the wireless communication module wirelessly communicates with a superior master station; the isolating switch, the molded case circuit breaker, the emergency power interface, and the SVG static VAR generator are connected to a three-phase main incoming line circuit within the box body.

[0009] Preferably, the SVG static VAR generator includes a static VAR generator body, a three-phase current transformer and a liquid crystal display screen, and the three-phase current transformer is installed in a three-phase main incoming line loop in the box.

[0010] Preferably, the wireless communication module includes a wireless communication module body and an antenna, and a SIM card is installed inside the wireless communication module body.

[0011] Preferably, the wireless communication module is connected to the 485A and 485B interfaces of the SVG static VAR generator via a data line, and the wireless communication module is connected to the voltage output interface of the SVG static VAR generator via a power line.

[0012] Preferably, the molded case circuit breaker is electrically connected to the disconnector and the emergency power interface through the main busbar copper bar and the emergency busbar copper bar respectively.

[0013] Preferably, the emergency busbar copper bar has a bent structure.

[0014] Preferably, a ground busbar copper bar and a zero-sequence busbar copper bar are arranged inside the box.

[0015] Preferably, a plurality of sheet metal supports, cable fixing frames and isolation plates are provided inside the box.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The utility model increases the functions of power system data collection, fault identification and information uploading, power quality management and emergency power supply by providing an SVG static VAR generator and an emergency power supply interface, and enhances the safety and accuracy of the compensation system. These advantages will ensure the power quality of users on the load side, reduce the damage to the distribution network and power-consuming equipment caused by load-side faults, and in the event of a power outage, an external power supply can be connected through the emergency power supply interface to improve power supply reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural front view of a cable branch box according to an embodiment of the present utility model;

[0019] Figure 2 This is an oblique axial diagram of the structure of the cable branch box according to an embodiment of the present utility model;

[0020] Figure 3 A partial structural perspective view of a cable branch box according to an embodiment of the present invention;

[0021] Figure 4 This is an electrical schematic diagram of a cable branch box according to an embodiment of the present invention;

[0022] In the figure, 1 is the disconnector, 2 is the molded case circuit breaker, 3 is the SVG static VAR generator, 4 is the main busbar, 5 is the emergency power interface, 6 is the ground busbar, 7 is the zero-sequence busbar, 8 is the wireless communication module, 9 is the box, and 10 is the emergency busbar. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below. Before proceeding with the description, it should be understood that the terms used in this specification and the appended claims should not be interpreted as limited to their general meanings and dictionary meanings, but should be interpreted according to the meanings and concepts corresponding to the technical aspects of the present invention, based on the principle that allows the inventor to appropriately define the terms for optimal interpretation. Therefore, the descriptions presented here are merely preferred examples for illustrative purposes and are not intended to limit the scope of the present invention. It should be understood that equivalents or improvements can be obtained therefrom without departing from the spirit and scope of the present invention.

[0024] The following embodiments are merely listed as examples of implementation schemes of the present invention and do not constitute any limitation to the present invention. Those skilled in the art will understand that modifications without departing from the essence and scope of the present invention fall within the scope of protection of the present invention.

[0025] like Figure 1-3 As shown, a cable branch box supporting load-side power quality management includes a rectangular box body 9, comprising an internal rectangular frame and six panels (top, bottom, left, right, front, and rear) fixed to the outside of the rectangular frame by screws. Inside the box body 9 are several sheet metal supports, cable fixing brackets, and isolation plates. The six panels of the box body 9 provide external protection for internal components, protecting them from water, sunlight, and corrosion, ensuring safe and stable operation of the electrical components inside the box body 9.

[0026] An SVG static VAR generator 3 is fixedly installed in the middle of the housing 9. The SVG static VAR generator 3 has a capacity of 20 kVar and is a reactive power compensation device designed to improve power quality, reduce line losses, and improve power factor. The SVG static VAR generator 3 includes a static VAR generator body, an LCD display, and a three-phase current transformer. Above the SVG static VAR generator 3, from left to right, are fixedly installed an isolating switch 1 and three molded case circuit breakers 2. Three sets of horizontal main busbars 4 are fixedly installed above the isolating switch 1 and molded case circuit breakers 2. Below the SVG static VAR generator 3, from left to right, are fixedly installed a ground busbar 6 and a zero-sequence busbar 7. Four emergency power connections 5 are fixedly installed to the right of the molded case circuit breakers 2, the SVG static VAR generator 3, and the zero-sequence busbar 7. A wireless communication module 8 is fixedly installed on the inner side of the left panel of the housing 9. The three groups of main busbars 4 are electrically connected to the three molded case circuit breakers 2 and the disconnector 1 respectively. The right ends of the three groups of main busbars 4 are fixedly connected to the three groups of emergency busbars 10 in the vertical direction respectively. The three groups of emergency busbars 10 are electrically connected to the three emergency power supply interfaces 5 respectively.

[0027] SVG static VAR generator 3, the optional model is SINL SVG, which is used to collect load-side current, calculate reactive power current, and perform fault diagnosis. When the power quality on the load side changes, the user loses too much reactive power, and the voltage drops, the SVG static VAR generator 3 communicates with the smart terminal through the wireless communication module 8 to upload relevant data, automatically determine the current power system status, and promptly trigger the protection function and switch reactive compensation to ensure high-quality power supply. The SVG static VAR generator 3 has an upper and lower split modular structure. Multiple units can be networked to form a compensation system. It can easily realize on-site, decentralized automatic compensation functions, and can also meet the mixed compensation requirements in three-phase unbalanced situations. The SVG static VAR generator 3 also has zero-crossing switching, modern measurement and control, network communication, automatic control and other functions. The SVG static VAR generator 3 is installed in the box 9, as shown Figure 4 As shown, a three-phase current transformer of the SVG static VAR generator 3 is installed on the three-phase main incoming line circuit. The two ports IA S1 and IA S2 form a circuit to collect the A-phase current, the two ports IB S1 and IB S2 form a circuit to collect the B-phase current, and the two ports IC S1 and ICS2 form a circuit to collect the C-phase current.

[0028] The wireless communication module 8 is a terminal-specific 4G wireless acquisition module, model inDTU3, which includes a wireless communication module body and an antenna. A SIM card is installed inside the wireless communication module body, and it communicates with the upper-level master station via wireless transmission. The wireless communication module 8 uses the 104 protocol to transmit data to the upper-level master station, and uploads relevant data and fault types of the SVG static VAR generator 3 to the upper-level master station in a timely manner.

[0029] The SVG static VAR generator 3 is electrically connected to the wireless communication module 8, which is connected to the 485A and 485B interfaces of the SVG static VAR generator 3 via a data line. The wireless communication module 8 is connected to the 24V voltage output interface of the SVG static VAR generator 3 via a power line to realize power supply.

[0030] The ground busbar copper bar 6 is used to connect the ground wires on the incoming and outgoing cables to prevent external discharge when the internal insulation of the cable is damaged, thereby protecting external components and personal safety; the zero-sequence busbar copper bar 7 is used to draw power from the equipment to form a power supply circuit.

[0031] Refer to the attached Figure 3There are three main busbars 4 connected to the disconnector 1. The top ends of the three connecting plates of the disconnector 1 are connected to the left ends of each main busbar 4. The molded case circuit breaker 2 has nine connecting plates (2), divided into three groups. Each group contains three small connecting plates (2) for the left, middle, and right sides. The top ends of the connecting plates are fixedly connected to the middle of each main busbar 4. There are three emergency busbars 10 connected to the emergency power connection 5. The top ends of the emergency busbars 10 are fixedly connected to the rightmost ends of each main busbar 4, and the bottom ends of the emergency busbars 10 are electrically connected to the emergency power connection 5. All emergency busbars 10 are bent accordingly according to their front and rear positions.

[0032] like Figure 4 As shown, the working principle of a cable branch box supporting load-side power quality management in an embodiment of the present invention is as follows:

[0033] The main busbar copper bar 4, disconnector 1, molded case circuit breaker 2, emergency busbar copper bar 10 and emergency power interface 5 form a primary main circuit of the cable branch box that supports load side power quality management. Figure 4 QF1 in) is connected to the low voltage grid, and molded case circuit breaker 2 ( Figure 4 QS1, QS2, and QS3 in the circuit breaker are connected to load-side users, and molded case circuit breaker 2 is in the normally closed state. Under normal power supply conditions, disconnector 1 is closed, and power is supplied by the low-voltage grid. The primary main circuit is used to divide the low-voltage grid's 400V / 630A main incoming busbar circuit into three outgoing busbar branches, tapping or switching cables, and providing electrical protection for components in the event of internal three-phase imbalance faults and static electricity faults. Disconnector 1 connects the low-voltage grid to load-side users under normal power supply conditions and disconnects the low-voltage grid from load-side users during power outages. The molded case circuit breaker 2 is installed on the three outgoing busbars, and the other end of the molded case circuit breaker 2 is connected to the load side user / power facility. The molded case circuit breaker 2 is used to disconnect the outgoing busbar side line; the function of the emergency power interface 5 is to connect an external power supply or an external power supply device from the emergency power interface 5 when the main incoming busbar circuit cannot provide electrical energy to supply power to the three outgoing busbar circuits; when it is necessary to urgently power other high-power electrical equipment, the emergency power interface 5 can provide an external interface to ensure the power supply reliability and the safety of the basic power transmission function of the equipment.

[0034] The SVG static VAR generator 3 collects current data and calculates reactive current through a three-phase current transformer installed on the main incoming busbar, and transmits the data to the wireless communication module 8 through the 485 communication interface. Phases A, B, C, and N are the main power supply busbars and are also connected to the emergency power interface 5. Figure 4 The emergency power interface 5 is not shown.

[0035] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the above embodiments, or to replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

Claims

1. A cable branch box supporting load-side power quality management, comprising a box body (9), characterized in that: An SVG static VAR generator (3), an isolating switch (1), a molded case circuit breaker (2), an emergency power interface (5) and a wireless communication module (8) are arranged inside the box (9); the molded case circuit breaker (2) is electrically connected to the isolating switch (1) and the emergency power interface (5), respectively; the SVG static VAR generator (3) is electrically connected to the wireless communication module (8); the wireless communication module (8) wirelessly communicates with the upper master station; the isolating switch (1), the molded case circuit breaker (2), the emergency power interface (5) and the SVG static VAR generator (3) are connected to a three-phase main incoming line circuit in the box (9).

2. A cable branch box supporting load-side power quality management according to claim 1, characterized in that: The SVG static VAR generator (3) comprises a static VAR generator body, a three-phase current transformer and a liquid crystal display screen, wherein the three-phase current transformer is installed in a three-phase main incoming line loop in a box (9).

3. A cable branch box supporting load-side power quality management according to claim 2, characterized in that: The wireless communication module (8) comprises a wireless communication module body and an antenna, and a SIM card is installed inside the wireless communication module body.

4. A cable branch box supporting load-side power quality management according to claim 3, characterized in that: The wireless communication module (8) is connected to the 485A and 485B interfaces of the SVG static VAR generator (3) via a data line, and the wireless communication module (8) is connected to the voltage output interface of the SVG static VAR generator (3) via a power line.

5. The cable branch box supporting load-side power quality management according to claim 1, characterized in that: The molded case circuit breaker (2) is electrically connected to the disconnector (1) and the emergency power interface (5) via the main busbar copper bar (4) and the emergency busbar copper bar (10), respectively.

6. A cable branch box supporting load-side power quality management according to claim 5, characterized in that: The emergency busbar copper bar (10) has a bent structure.

7. The cable branch box supporting load-side power quality management according to claim 1, characterized in that: A ground busbar copper bar (6) and a zero-sequence busbar copper bar (7) are arranged inside the box (9).

8. The cable branch box supporting load-side power quality management according to claim 1, characterized in that: Several sheet metal supports, cable fixing frames and isolation plates are arranged inside the box (9).

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