CN109149390B - Power capacitor compensation device shell - Google Patents

Abstract

The invention relates to a power capacitor compensation device shell, which comprises a modularized fixed support frame of a capacitor body and an independent capacitor body outer cover, wherein the modularized fixed support frame of the capacitor body comprises a circuit board fixing seat, three-phase four (three) wire connecting terminals, a miniature circuit breaker support frame and a capacitor body outer cover fixing seat; the independent capacitor outer cover is an integral shell made of ABS (Acrylonitrile butadiene styrene) materials, a boss is arranged at the edge of the inner side of the shell of the power capacitor compensation device and can limit the capacitor body, a clamping groove is arranged at the tail of the shell of the power capacitor compensation device and is used for fixing the circuit function board, transverse stress deformation of the shell of the power capacitor compensation device can be reduced, and transverse or longitudinal impact and vibration generated to the function board in the installation or transportation process can be buffered. The power capacitor shell has the characteristics of light weight, smooth surface, modularization, heat resistance, difficult deformation and the like.

Description

Power capacitor compensation device shell

Technical Field

The invention relates to a power capacitor compensation device shell in the reactive compensation field.

Background

With the rapid promotion of the national urban process, a large number of residential buildings such as residential building trays, high-grade markets, hotels, offices and the like are pulled up in cities, and the urban electricity consumption is rapidly increased. However, most of these civil construction sites use single-phase inductive loads, resulting in severely low power factor of the grid and severely high reactive power line losses. This is not compatible with the current national policy of energy conservation, emission reduction and environmental protection. Reactive compensation is adopted, so that the method is an effective method for improving the quality of electric energy, excavating the potential of a power grid and reducing the line loss.

The reactive power problem commonly exists in five links of power generation, power transmission, power transformation, power distribution and power utilization, and a plurality of adverse effects are generated on the stable operation of a power system. The reactive power compensation device for the low-voltage distribution transformer area mainly comprises a centralized intelligent capacitor bank for compensation, an intelligent capacitor bank is assembled on the low-voltage bus side of the distribution transformer, the intelligent capacitor bank is controlled to switch according to reactive power on the low-voltage bus to compensate the reactive power, the variable distribution utilization rate is improved, the barrier effect is achieved, the reactive power is prevented from being intruded into a power grid at the upper level to cause voltage fluctuation, and the network loss is reduced.

The patent with the publication number CN206422388 discloses an intelligent capacitor compensation device shell structure suitable for bus connection, the shell is an oblong body, a display mounting hole is formed in the front of the shell, two communication interfaces are formed in the back of the shell, a bus fuse is fixedly arranged in the back of the shell, and the fixed connection of a capacitor and a functional board not only increases the mounting cost and difficulty, but also influences the stability of the power capacitor compensation device and is inconvenient to maintain.

Disclosure of Invention

In order to solve the technical problems in the prior art, the invention provides the power capacitor compensation device shell with low cost and high integration, the power capacitor compensation device is subjected to modularized disassembly design, the fixation mode of the capacitor and the functional board is subjected to innovative design, and the integral support between the fixed functional board and the capacitor body is removed.

The power capacitance compensation device shell comprises a modularized fixed support frame of a capacitor body and an independent capacitor shell, wherein the longitudinal inner side edge of the power capacitance compensation device shell adopts a boss design, and the tail part of the power capacitance compensation device shell adopts a clamping groove design.

Preferably, the modularized fixing support frame of the capacitor body comprises a body circuit board fixing frame, a body modularized three-phase four (three) wire connecting terminal, a body modularized miniature circuit breaker support frame and a capacitor body shell fixing seat.

In any of the above aspects, preferably, the independent capacitor cover is a plastic integrated case.

In any of the above schemes, preferably, the modular fixing support frame of the capacitor body provides two main board mounting and fixing modes, namely, two modes of direct mounting and supporting mounting are adopted.

In any of the above aspects, preferably, an injection molding member is additionally installed above the capacitor body, and the functional board and the capacitor case are fixed through a positioning hole reserved on the injection molding member.

In any of the above aspects, it is preferable that the three-phase four (three) wire connection terminals are injection-molded nuts, and the inter-phase connection terminals have a large distance.

In any of the above aspects, preferably, the micro breaker is fixed to the capacitor body by an injection molding of the capacitor body module, and the micro breaker is mounted separately from the functional board.

In any of the above schemes, preferably, the bottom of the miniature circuit breaker support frame is integrated with an independent casing fixing hole seat, and is fixedly installed with the capacitor body outer cover.

In any of the above schemes, it is preferable that the a-phase and C-phase two-phase current transformers are horizontally mounted on the tail functional board, two-phase wires externally transmitted into the miniature circuit breaker simultaneously pass through the horizontal type through-core current transformer on the tail functional board to collect current, and the current is collected by the through-core current transformer fixed outside the board and passing through the B-phase wires transmitted into the relay from the miniature circuit breaker inside the current co-compensation capacitor.

In any of the above schemes, preferably, the front end of the housing of the power capacitance compensation device is designed as an oblique plane open hole, and studs are used in the housing to fix the display panel.

In any of the above schemes, preferably, two sides of the outer housing of the power capacitance compensation device are provided with vertical heat dissipation slots.

In any of the above schemes, preferably, the capacitor body is mounted at the bottom of the device in a mosaic design, and a detachable bottom shell is also used.

In any of the above aspects, the capacitor body and the capacitor case upper cover are preferably fixed.

In any of the above schemes, preferably, the front layout of the capacitor case mainly includes windows such as a liquid crystal display, a key, an indicator light, a miniature circuit breaker, etc., the tail portion includes a two-bit RJ45 interface, a three-phase four-wire interface, an external current metering terminal interface, and the left side face round hole is an N-phase terminal interface.

Preferably in any of the above aspects, the power capacitor control system hardware includes a motherboard, a function board, and a switch board.

In any of the above schemes, preferably, the module of the capacitor body includes a main control display module, a terminal power conversion and analog signal sampling module, a current metering sampling module, a magnetic latching relay switch module, a communication module and a current collecting module.

In any of the above aspects, preferably, the modular main board of the capacitor body is provided with a magnetic latching relay, a metering module, a storage module and a control module.

In any of the above schemes, preferably, the modularized function board of the capacitor body is provided with a 485 communication module and a current transformer module, and the function board is vertically fixed at the tail part of the capacitor board.

In any of the above aspects, preferably, the main board and the functional board are connected by a flexible flat cable.

In any of the above embodiments, it is preferable that the modular switch boards of the capacitor body are vertically fixed to the main board in two rows.

In any of the above embodiments, it is preferable that the injection-molded control unit circuit board and the capacitor case are fixedly mounted on the capacitor body.

In any of the above aspects, it is preferable to use a case of the power capacitor compensation device.

In any of the above aspects, it is preferable that the compensation device for the power capacitor is used.

According to the power capacitor compensation device shell, the installation efficiency is obviously improved, the labor cost is reduced, the upper part of the capacitor body is designed into a modularized injection molding piece, and the functional board and the capacitor are fixed through the reserved positioning holes on the injection molding piece. Meanwhile, the injection molding piece can be fixed in a mode of increasing support, and various solutions are provided for the installation of functional boards with different sizes. The miniature circuit breaker passes through module injection molding is fixed with the condenser body, and the integrated independent shell fixed orifices seat in injection molding bottom, miniature circuit breaker and the design of separately installing of function board because miniature circuit breaker is not direct mount on the function board to avoided causing the function board deformation because weight extrusion, and led to unstable hidden danger, independent modular design makes installation and maintenance become more convenient, improves work efficiency when reducing quality risk. The tail functional board is installed by adopting a clamping groove type, so that the material cost brought by a conventional stud installation mode is reduced, and the installation space is saved. Meanwhile, a horizontal current transformer is adopted, the horizontal current transformer is welded and installed on the tail functional board, two phases of wires transmitted into the miniature circuit breaker from the outside penetrate through the horizontal through type current transformer on the tail functional board at the same time, and current signals are collected. The mode is different from the mode that current transformers adopted by the traditional power capacitance compensation device are all arranged on the outlet side of the miniature circuit breaker, so that the installation space and the installation difficulty are reduced, and meanwhile, the stability of the power capacitance compensation device is enhanced. Therefore, the invention can realize the shell of the user power capacitance compensation device, has higher modularization degree and smaller assembly workload, further reduces the space occupied by the circuit board and the hardware cost, and has convenient equipment maintenance and lower failure rate.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a front view of a preferred embodiment of a power capacitor compensation device according to the present invention.

Fig. 2 is a side view of the embodiment of fig. 1 of the power capacitor compensation device according to the invention.

Fig. 3 is a top view of the embodiment of fig. 1 of the power capacitor compensation device according to the invention.

Fig. 4 is a side view of the overall installation of the embodiment of fig. 1 of the power capacitor compensation device according to the invention.

Fig. 5 is a rear view of the complete machine installation of the embodiment of fig. 1 of the power capacitor compensation device according to the invention.

Fig. 6 is a field scheme diagram of the embodiment of fig. 1 of a power capacitor compensation device according to the invention.

FIG. 7 is a functional diagram of the hardware of the embodiment of FIG. 1 (division complement) of the power capacitor compensation device according to the invention

Fig. 8 is a hardware functional diagram (co-compensation) of another embodiment of a power capacitor compensation device according to the invention.

Fig. 9 is a schematic view of the internal structure of the embodiment shown in fig. 1 of the power capacitor compensation device according to the present invention.

1-pilot lamp 2-control button 3-heat dissipation slotted hole 4-miniature circuit breaker 5-A phase power inlet wire

6B phase power supply inlet wire 7-C phase power supply inlet wire 8-N phase inlet wire 9-transformer

10 low-voltage main line 11-power voltage compensation device 12-metering box 13-household line

14 user 15-base plate 16-mutual inductor 17-485 communication 18-function board 19AC-DC

20-metering module 21-motherboard 22-display module 23-switchboard 24-capacitor bank

25-miniature circuit breaker support 26-three-phase four (three) wire connecting terminal 27-circuit board fixing seat

28-a housing fixing seat.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In order to solve the development trend of miniaturization and integration of power electronics technology, the invention carries out modularized design on the power capacitor compensation device. The power capacitor compensation device shell comprises a modularized injection molding part and a housing on the capacitor body. The modularized injection molding piece comprises injection molding nuts of three-phase four (three) wire connecting terminals, positioning holes and support columns corresponding to the main board and support columns for installing the miniature circuit breaker. The front end of the outer housing is designed as an oblique angle plane opening, and four plastic studs are adopted inside to fix the display panel. In order to realize the device modularization, the function of the main board inside the capacitor is divided. The magnetic latching relay, the metering module, the storage module, the control module and the like are designed on the main board. 485 communication module, current transformer sampling module design are on the afterbody function board. Through such modular design, thereby shorten the length of mainboard and reduced the atress oppression of miniature circuit breaker to the mainboard, improved mainboard stability and installation convenience. Compared with the traditional installation mode of sleeving the current transformer on the outlet of the miniature circuit breaker, the novel installation mode reduces the production workload and error rate, and simultaneously reduces the space required by the conventional installation mode, so that the whole product design is more compact. The tail functional board adopts a clamping groove type design, and is fixed under the condition of not adopting screws, so that the material cost is reduced and the installation convenience is improved. The main board is connected with the functional board through a soft flat cable. On the premise of ensuring electrical safety, the maximum utilization of the internal space is realized. The capacitor body adopts mosaic design, installs in equipment bottom, adopts detachable drain pan simultaneously, makes things convenient for the installation maintenance and the change of capacitor body.

Example 1

The invention relates to a power capacitor compensation device shell, as shown in fig. 1, wherein a round hole at the upper part of a display part is used for indicating the position of a lamp 1, and round and square holes at the lower part of the display part are used for controlling the position of a key 2. As shown in fig. 2 and 4, two sides of an outer housing of the power capacitor compensation device are provided with vertical heat dissipation slots 3, as shown in fig. 3 and 5, a miniature circuit breaker 4 is installed on a 55mm x 46mm opening at the upper end of the tail of the housing, and three elliptical openings with 18mm intervals are formed at the rear end of the miniature circuit breaker 4 opening, so that a screwdriver can enter to screw a fixing screw when an external power supply is connected with the miniature circuit breaker. The upper part of the rear end of the housing is provided with three open holes of 8mm 13mm, and the open holes are respectively provided with an external power supply inlet wire of an A phase 5, a B phase 6 and a C phase 7 from left to right, wherein the A, C phase power supply wire passes through the open holes and the current transformer on the functional board on the internal clamping groove and then enters the miniature circuit breaker. The lower part of the rear end of the housing is provided with a rectangular opening 60mm 16mm for reserving positions for two network ports and an indicator lamp connector of the function board for external communication so as to realize external communication. The circular holes with the diameter of 10mm are reserved below the rectangular holes at the tail part and behind the side of the outer housing respectively, the circular holes at the tail part are used as N-phase wire inlets of the sub-compensation capacitors, and the circular holes at the side rear part are used for allowing a screwdriver to enter when the N-phase wire inlet 8 is conveniently installed. The shell is made of plastic materials, and the shell and the capacitor body are fixed through four screws on the side face of the shell.

As shown in fig. 6 and 7, the intelligent compensation terminal is a four-phase compensation device, the selectable capacity of the compensation capacitor body is 2.5Kvar-30Kvar, and reactive power can be compensated independently for each phase. The low-voltage three-phase four-wire transmission line is connected to a user 14 through a transformer 9, a low-voltage main line 10, a power voltage compensation device 11, a metering box 12 and a household line 13, and is connected with an N line 8 terminal of the integrated capacitor body and a voltage input pin of the magnetic latching relay in the switch board through a main switch of the miniature circuit breaker control terminal system. The main board realizes the functions of system AC-AC voltage reduction, AC-DC conversion 19, control circuit power supply, AC sampling and the like, and is connected and communicated with the tail functional board through a soft flat cable; the main board is used for realizing the functions of metering processing of the alternating acquisition signals, switching board switching control, control of various status indicator lamps, data storage, LCD display and the like. The tail functional board completes the external current data sampling and 485 communication functions.

In this embodiment, the inner edge of the housing is designed as a boss, and the boss limits the capacitor body. The shell tail adopts the draw-in groove design, the draw-in groove is used for the fixed mounting of circuit board. The boss depth is 3mm, and horizontal degree of depth is 1mm, and homonymy draw-in groove interval is 1.6mm for the circuit board installation.

In this embodiment, the modular fixing support frame of the capacitor body includes a body circuit board fixing seat 27, a body modular three-phase four (three) wire connection terminal 26, a body modular miniature circuit breaker support frame 25, and a capacitor body housing fixing seat 28.

In this embodiment, the independent capacitor housing is an integral plastic housing.

In this embodiment, the modular fixing support frame of the capacitor body provides two fixing modes for mounting the motherboard, namely, two modes of direct mounting and supporting mounting are adopted.

In this embodiment, an injection molding member is additionally installed above the capacitor body, and the functional board and the capacitor housing are fixed through a positioning hole reserved on the injection molding member.

In this embodiment, the three-phase four (three) wire connection terminals are injection nuts, and the distances between the connection terminals are large.

In this embodiment, the micro breaker is fixed to the capacitor body by an injection molding of the capacitor body module, and the micro breaker is installed separately from the function board.

In this embodiment, the bottom of the support frame of the miniature circuit breaker is integrated with an independent housing fixing hole seat, and is fixedly installed with the outer cover of the capacitor body.

In this embodiment, the current transformer 16 is horizontally mounted on the tail function board, and A, C two-phase wires externally transmitted into the miniature circuit breaker pass through the horizontal type through-core current transformer on the tail function board at the same time to collect current.

In this embodiment, the front end of the outer casing of the power capacitance compensation device is designed as an oblique plane open hole, and studs are used in the outer casing to fix the display panel.

In this embodiment, the periphery of the outer housing of the power capacitance compensation device is provided with a vertical heat dissipation slot 3.

In this embodiment, the capacitor body is mounted on the bottom of the device by using an inlay design, and a detachable bottom shell is used.

In this embodiment, the capacitor body and the capacitor outer case upper cover are fixed.

In this embodiment, the front layout of the capacitor case mainly includes windows such as a liquid crystal display, a key 2, an indicator light 1, and a miniature circuit breaker 4, and the tail includes a two-bit RJ45 interface, a three-phase four-wire interface, and an external current metering terminal interface, and the left round hole is an N-phase terminal interface.

In the present embodiment, the power capacitor control system hardware includes a main board 21, a function board 18, and a switch board 23.

In this embodiment, the modules of the capacitor body include a main control display module 22, a terminal power conversion and analog signal sampling module, a current metering sampling module, a magnetic latching relay switch module, a communication module and a current collection module.

In this embodiment, the modular motherboard 21 of the capacitor body is provided with a magnetic latching relay, a metering module 20, a memory module and a control module.

In this embodiment, the modularized function board of the capacitor body is provided with a 485 communication module 17 and a current transformer module, and the function board 18 is vertically fixed at the tail part of the capacitor board.

In this embodiment, the main board and the functional board are connected by a flexible flat cable.

In this embodiment, the modularized switch boards of the capacitor body are vertically fixed on the main board in two rows up and down.

In this embodiment, the injection molding control unit circuit board and the capacitor case on the capacitor body are fixedly installed.

In this embodiment, it employs the housing of the power capacitor compensation device.

In this embodiment, the compensation device of the power capacitor is adopted.

Example 2

As shown in fig. 6 and 8, the intelligent compensation terminal is a three-phase co-compensation device, the selectable capacity of the co-compensation capacitor body is 2.5Kvar-40Kvar, and reactive power can be compensated independently for each phase. The control system hardware comprises a main board 21, a functional board 18 and a switch board 23. The switch board for switching the capacitor is vertically fixed on the main board in an upper row and a lower row, and the functional board is vertically fixed at the tail part of the capacitor board, so that the maximum utilization of space is ensured. Meanwhile, strong current signals and weak current signals are respectively distributed on the front side and the rear side of the main board, and safety distance is ensured.

Example 3

As shown in fig. 4 and 9, the terminal housing is divided into a black injection-molded part on the capacitor body and a capacitor upper cover. The capacitor body and the capacitor upper cover are fixed through screws around the capacitor, and the black injection molding piece on the body is supported through the copper column, and the control unit circuit board and the capacitor are fixedly installed. The front layout of the shell mainly comprises windows such as a liquid crystal display, a key 2, an indicator lamp 1, a miniature circuit breaker 4 and the like, the tail part of the shell comprises a two-position RJ45 interface, a three-phase four-wire interface and an external current metering terminal interface, and the left side surface round hole is an N-phase terminal interface. The two sides of the upper cover are provided with vertical strip-shaped slotted holes, so that heat dissipation of the capacitor is ensured. The total dimension of the upper cover (length x width x height) is 345mm x 78mm x 100mm, and is directly mounted above the capacitor body, due to the space limitation of the mounting, the shell of the intelligent power capacitor compensation device adopts a slotted heat dissipation design mode at two sides, and utilizes the temperature difference between the shell and the outside air to realize circulating heat dissipation, so that the heat conduction effect brought by the convection of the inside air and the outside air is enhanced. Meanwhile, an over-temperature overvoltage protection circuit is arranged in the terminal, the temperature of the capacitor is monitored in real time, the reliable operation of the device is ensured, and the safety of the device is improved.

The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions illustrate the principles of the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (6)

1. The utility model provides a power capacitor compensation arrangement shell, includes the fixed support frame of modularization of condenser body and independent condenser dustcoat, its characterized in that: the longitudinal inner side edge of the power capacitor compensation device shell adopts a boss design, and the tail part of the power capacitor compensation device shell adopts a clamping groove design; the modularized fixing support frame of the capacitor body comprises a body circuit board fixing frame, a body modularized three-phase four-wire connecting terminal, a body modularized miniature circuit breaker support frame and a capacitor body shell fixing seat; the independent capacitor outer cover is an integrated shell made of plastic materials; an injection molding piece is additionally arranged above the capacitor body, and the functional board is fixed with the capacitor body shell through a positioning hole reserved on the injection molding piece; the miniature circuit breaker is fixed with the capacitor body through the injection molding piece of the capacitor body module, and the miniature circuit breaker and the functional board are installed separately.

2. A power capacitor compensation device housing according to claim 1, characterized in that: the modularized fixed support frame of the capacitor body provides two main board installation and fixation modes, namely, two modes of direct installation and support installation are adopted.

3. A power capacitor compensation device housing according to claim 1, characterized in that: the three-phase four-wire or three-phase three-wire connecting terminals are injection molding nuts, and the distances between the inter-phase connecting terminals are larger.

4. A power capacitor compensation device housing according to claim 1, characterized in that: the bottom of the miniature circuit breaker support frame is integrated with an independent shell fixing hole seat which is fixedly arranged with the capacitor body outer cover.

5. A compensation device for a power capacitor, characterized by: which employs a housing of the power capacitor compensation device of claims 1 to 4.

6. A power capacitor, characterized by: which employs the compensation device of the power capacitor as claimed in claim 5.