Low-voltage inlet wire connection power distribution cabinet with metering function

Abstract

A low-voltage inlet wire contact power distribution cabinet with a metering function is characterized by comprising a cabinet body, a metering chamber is arranged at the upper end of the cabinet body, a watt-hour meter is arranged in the metering chamber, a middle frame circuit breaker chamber and a lower frame circuit breaker chamber are sequentially arranged at the lower end of the cabinet body, and a circuit breaker 1QF and a circuit breaker 3QF are arranged in the middle frame circuit breaker chamber and the lower frame circuit breaker chamber respectively. A branch of the main busbar is electrically connected with the watt-hour meter, the circuit breaker 1QF and the circuit breaker 3QF in sequence.

Description

Technical Field

[0001] The utility model relates to the field of power distribution cabinets, in particular to a low-voltage incoming line connection power distribution cabinet with a metering function. Background Art

[0002] At present, electricity consumption is closely related to people's lives. The power supply department will charge users according to their electricity consumption. The charging device corresponds to the meter, and there are strict requirements for the installation, wiring, lead sealing, etc. of the meter. The traditional solution is to use a low-voltage distribution metering cabinet with the same size as the low-voltage cabinet to install the meter, and the contact switch also uses a separate contact cabinet, which is not conducive to improving the utilization rate of today's land resources, and is very wasteful of non-ferrous metals and related resources. Utility Model Content

[0003] In order to solve the above problems, the present technical scheme provides a low-voltage incoming line connection distribution cabinet with metering function, and integrates the metering watt-hour meter into the low-voltage incoming line connection cabinet; the general incoming line connection cabinet itself is installed with two large-current frame circuit breakers and circuit breaker primary copper busbar connection and other devices, which occupy most of the installation space of the cabinet; this design solves the connection problem of the primary live copper busbar in the cabinet, and also needs to consider making the installation space of the watt-hour meter and the metering transformer into a dedicated separate metering room in the compact cabinet, and the instrument room of this metering room needs to be completely physically separated from the compartment of the live copper busbar and the circuit breaker to ensure a certain live gap and power safety and other technical difficulties.

[0004] To achieve the above purpose, the technical solution is as follows:

[0005] A low-voltage incoming line connection distribution cabinet with a metering function comprises a cabinet body, wherein a metering chamber is provided at the upper end of the cabinet body, wherein an electric watt-hour meter is provided inside the metering chamber, and a middle frame circuit breaker chamber and a lower frame circuit breaker chamber are provided at the lower end in sequence, wherein circuit breakers 1QF and 3QF are provided respectively, and a main busbar for conduction is further provided, wherein branches of the main busbar are electrically connected to the electric watt-hour meter, circuit breaker 1QF and circuit breaker 3QF in sequence, and a circuit part is further provided.

[0006] In some embodiments, the door of the metering chamber is provided with a travel switch.

[0007] In some embodiments, the circuit portion includes:

[0008] A junction box BX, one end of which is used to receive three-phase input power, and the end is also grounded through a current transformer TAa, a current transformer TAb, and a current transformer TAc;

[0009] The other end of the junction box BX is connected to the watt-hour meter PJ1 and the load control terminal PJ2 respectively.

[0010] In some embodiments, the current transformer TAa, current transformer TAb and current transformer TAc are connected to the circuit breaker 1QF in sequence, the circuit breaker 1QF is also connected to the circuit breaker 3QF, the circuit breaker 3QF is connected to the load through a bus section, and the circuit breaker 3QF is also connected to the load through two bus sections.

[0011] The beneficial effects of this application are:

[0012] Previously, the domestic market has always used a low-voltage distribution meter cabinet with the same size as the low-voltage incoming cabinet to install the watt-hour meter. In addition, the low-voltage incoming cabinet and the contact cabinet, most of the solutions also use a separate incoming cabinet and a separate contact cabinet, two distribution cabinets; the design of this solution effectively combines the three distribution cabinets with the above three functions into the same cabinet, making the maximum use of the limited space of the distribution cabinet, while also saving users the installation space of the distribution room, which can alleviate the current situation of high prices and tight land resources in cities;

[0013] Three distribution cabinets with three functions are integrated into one distribution cabinet with three functions, which saves non-ferrous metal resources such as copper and steel to the greatest extent; and the low-voltage incoming line contact distribution cabinet with special metering function fully meets the three functions of incoming line, contact and metering in one, shortens the processing time of the cabinet and speeds up the product delivery time;

[0014] The low-voltage incoming line distribution cabinet with special metering function is not only beautiful in appearance, but also has a metering room door that can be sealed with lead, and double anti-electricity theft protection measures such as door opening tripping. It also brings higher timeliness to the operation and maintenance of on-site personnel. For example, operations such as switching off and metering only need to be completed on this cabinet, and there is no need to run around on three cabinets to operate as in the traditional way, which greatly saves operation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for describing the embodiments.

[0016] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0017] Figure 2 It is a schematic diagram of the electrical structure of an embodiment of the utility model. DETAILED DESCRIPTION

[0018] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0019] Please refer to Figure 1-2 As shown, a low-voltage incoming line connection distribution cabinet with metering function includes a cabinet body, a metering chamber is provided at the upper end of the cabinet body, and an electric meter is provided inside the cabinet body, and a middle frame circuit breaker chamber and a lower frame circuit breaker chamber are provided at the lower end in sequence, and circuit breakers 1QF and 3QF are provided in the cabinet body respectively, and a main busbar for conducting electricity is provided, and the branches of the main busbar are electrically connected to the electric meter, circuit breaker 1QF and circuit breaker 3QF in sequence, and a circuit part is also provided. The door of the metering chamber is provided with a travel switch. The circuit part includes;

[0020] A junction box BX, one end of which is used to receive three-phase input power, and the end is also grounded through a current transformer TAa, a current transformer TAb, and a current transformer TAc;

[0021] The other end of the junction box BX is connected to the watt-hour meter PJ1 and the load control terminal PJ2 respectively.

[0022] The current transformer TAa, the current transformer TAb and the current transformer TAc are connected to the circuit breaker 1QF in sequence, the circuit breaker 1QF is also connected to the circuit breaker 3QF, the circuit breaker 3QF is connected to the load through a section of bus, and the circuit breaker 3QF is also connected to the load through two sections of bus.

[0023] Technical solution:

[0024] A low-voltage incoming line connection distribution cabinet with a special metering function is generally composed of the following two parts: 1 structural parts, 2 electrical parts;

[0025] In terms of structural parts, thickened columns and beams are used to assemble the skeleton of the low-voltage cabinet, and then the top plate + front and rear door panels + cabinet sealing plates + partitions + busbar clamps + mounting brackets + insulating beams are assembled into a standard cabinet with a width of 800*depth of 1000*height of 2000mm. The cabinet is divided from top to bottom into a busbar room on the top of the cabinet, a special lead-sealed metering compartment, two frame circuit breaker compartments in front of the cabinet, and a vertical busbar connection room for connecting the two frame circuit breakers and installing the transformer at the back of the cabinet, as well as a vertical busbar connection room on the side. Busbar clamps are set on both sides and horizontally of the busbar room channel. The busbar room on the cabinet is 500mm high and is assembled together into a closed metal incoming busbar switch cabinet with a metering compartment.

[0026] The above-mentioned metering compartment is composed of partitions with rows of holes on the top and bottom and lead-sealed cabinet doors with observation windows at the front and back, which isolate the upper area of ​​the low-voltage cabinet into a metering room with a height of 600mm; a whole 10mm thick fixed insulating installation base plate is provided inside the metering room; this base plate separates the front and back of the cabinet body with a depth of 1 meter, and the rear compartment is about 500mm deep for connecting the copper busbar transformer compartment. The 0.2-level high-precision metering transformers TAa~TAc are installed in this compartment and are put on the interrupted copper busbar to facilitate the disassembly and assembly of the transformer. Behind this compartment is a cabinet door with an observation window and a lead seal. The front compartment is a metering instrument room with a depth of about 200mm, which is used to install electric meter PJ1, load control terminal PJ2, junction box BX and other instrument devices; from the front of the cabinet, the multimeter rack, metering junction box and other devices are fixed on the insulating board; the distance between the insulating board and the front door of the metering compartment is about 200mm; the front and rear doors of these two compartments are equipped with extra-large transparent observation windows, through which you can see the metering instrument and other components and wiring in the front, and the nameplate and wiring of the metering transformer in the back;

[0027] In order to prevent other people from stealing electricity and to facilitate billing personnel to check whether the wiring of components in the metering room has been changed, a travel switch XK is installed on the door of this metering compartment. When the door is opened, the travel switch will act, that is, the auxiliary point of the travel will change from normally open to normally closed, thereby connecting the tripping circuit of 1QF and tripping the incoming circuit breaker 1QF; in addition, a lead sealing hole is opened on this door, and a lead sealing screw is provided for professionals to seal the front and rear doors of this metering room after inspection; this double-layer protection measure can prevent ordinary people from opening the metering room to change the wiring and other electricity theft incidents!

[0028] In order to make the components inside the metering room clearly visible, the key wiring parts of the internal components are all facing the observation window, and the metering junction box is also made of fully transparent material, so that the billing personnel can clearly see whether the wiring of the components in the metering room has been changed during the inspection, which may lead to the occurrence of electricity theft;

[0029] The two 600mm high frame circuit breaker compartments mentioned above are respectively equipped with two drawer-type frame circuit breakers (1QF, 3QF). Behind the circuit breaker compartment is a vertical copper bar connection room, in which the connection copper bars of the two circuit breakers are installed. Six current transformers (1TAa~1TAc, 3TAa~3TAc) are respectively installed on the connection copper bars of various switches.

[0030] For the electrical parts, the above-mentioned main primary components are electrically connected as follows according to the primary system diagram: the lower pile of the incoming circuit breaker 1QF (Note: the main copper bar connection terminal of the circuit breaker, referred to as the upper and lower piles) and the upper pile of the tie circuit breaker 3QF are electrically connected through the horizontal busbar (L11, L12, L13, N); the horizontal busbar extends into the vertical busbar room with a net width of 150mm on the left side of the cabinet, and the 4-phase busbar of NABC is extended upward to the busbar room on the top of the cabinet and connected to the horizontal busbar (section I busbar) to provide power for the feeder circuits behind the section I busbar;

[0031] The upper pile of the incoming circuit breaker 1QF is connected to the incoming line ABC vertical copper busbar (1L1, 1L2, 1L3, N). The ABC 3-phase incoming line bar is arranged from back to front with a phase spacing of 110mm and from left to right with a horizontal spacing of 90mm. Then the incoming line bar is bent to the front of the cabinet and extended upward to the busbar room on the top of the cabinet. Before bending, the busbar is broken for installing the metering current transformer TAa~TAc. After the busbar is broken, the transformer is easy to disassemble and assemble (only need to The interrupted 400mm long copper bar is removed, and the transformer can be removed together with the copper bar. This interrupted copper bar is just in the middle height of the 600mm high metering transformer room. The measuring-level current transformers 1TAa~1TAc are installed at the lower end of the metering room, located at the rear end of the 1QF circuit breaker compartment; this incoming copper bar extends upward to the main busbar room, and the NABC is extended 200mm to the right side of the cabinet through the horizontal copper bar, which is convenient for the incoming busbar connection on the low-voltage side of the transformer;

[0032] The NABC vertical copper bars (L21, L22, L23, N) connected to the lower pile of the contact circuit breaker 3QF are arranged in sequence in the same vertical direction from left to right with a horizontal spacing of 90mm. This contact vertical bar is close to the rear of the cabinet and extends upward to the busbar room on the top of the cabinet. For the convenience of disassembly and assembly, the busbar is broken to install the current transformer (3TAa~3TAc). This transformer is located at the rear end of the 3QF circuit breaker compartment. This busbar can be connected to the II section busbar of the mains through the dense busbar duct in the busbar room; the above two groups of vertical copper bars, (L21, L22, L23, N) and (1L1, 1L2, 1L3) will pass through the upper and lower partitions of the metering room. In order to prevent accidents such as phase-to-phase short circuits, this partition is made into a whole piece of insulating plate with a row of holes, and the copper bar just passes through this hole, ensuring good insulation performance between the copper bars in the cabinet;

[0033] After the above-mentioned primary electrical components in the cabinet are connected through the copper busbar, the power supply circuit path of the incoming circuit breaker of this incoming line contact cabinet with a metering compartment is: (1QF is closed, 3QF is disconnected) the electricity passes through the main busbar incoming line (1L1, 1L2, 1L3, N), passes through the metering transformer and the measuring transformer in turn, to the upper pile of the incoming circuit breaker 1QF, passes through the circuit breaker to the lower pile of the incoming circuit breaker 1QF and the vertical busbar to the horizontal busbar (L11, L12, L13, N), and provides power for each feeder;

[0034] The power supply circuit path of the interconnection circuit breaker: (1QF is open, 3QF is closed) the power of the II section of the mains bus passes through the vertical interconnection bar (L21, L22, L23, N) behind the cabinet, to the lower pile of the interconnection circuit breaker 3QF, through the circuit breaker to the upper pile of the interconnection circuit breaker 3QF and the measuring transformer, to the vertical bus to the horizontal bus (L11, L12, L13, N), to provide power for each feeder; if the I section bus supplies power to the II section bus through the interconnection circuit breaker, the power supply path is the same, and the current direction is just opposite;

[0035] Because the power supply path of the interconnection circuit breaker does not pass through the metering transformer of the metering compartment, the metering function is available only when the incoming circuit breaker is supplying power, which can avoid repeated measurement with the meter of the section II mains incoming cabinet;

[0036] 1QF, 3QF circuit breakers and their corresponding indicator lights, buttons and digital multi-function meters can work normally after connecting the secondary lines according to the conventional schematic diagram; to prevent the parallel operation of the mains power of sections I and II; the incoming line and the connecting circuit breaker are simply and reliably electrically interlocked in their respective closing circuits to prevent the two mains power from running in parallel. The wiring of the watt-hour meter and the centralized monitoring is connected through the junction box using color-separated hard copper wires according to industry standards and the corresponding secondary schematic diagram; that is, the processing of a low-voltage incoming line connecting distribution cabinet with special metering function is completed, thereby realizing the function of the incoming line connecting distribution cabinet with special metering.

[0037] The above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application. Other principles and basic structures that are the same or similar to those of the present application are within the protection scope of the present application.

Claims

1. A low-voltage incoming line connection distribution cabinet with metering function, characterized in that: The cabinet comprises a cabinet, wherein a metering chamber is provided at the upper end thereof, wherein an electric watt-hour meter is provided inside the metering chamber, and a middle frame circuit breaker chamber and a lower frame circuit breaker chamber are provided at the lower end thereof in sequence, wherein circuit breakers 1QF and 3QF are provided respectively, and a main busbar for conducting electricity is further provided, wherein branches of the main busbar are electrically connected to the electric watt-hour meter, circuit breaker 1QF and circuit breaker 3QF in sequence, and a circuit part is further provided.

2. A low-voltage incoming line connection distribution cabinet with metering function according to claim 1, characterized in that: The door body of the metering chamber is provided with a travel switch.

3. A low-voltage incoming line connection distribution cabinet with metering function according to claim 1, characterized in that: The circuit part comprises: A junction box BX, one end of which is used to receive three-phase input power, and the end is also grounded through a current transformer TAa, a current transformer TAb, and a current transformer TAc; The other end of the junction box BX is connected to the watt-hour meter PJ1 and the load control terminal PJ2 respectively.

4. A low-voltage incoming line connection distribution cabinet with metering function according to claim 3, characterized in that: The current transformer TAa, the current transformer TAb and the current transformer TAc are connected to the circuit breaker 1QF in sequence, the circuit breaker 1QF is also connected to the circuit breaker 3QF, the circuit breaker 3QF is connected to the load through a section of bus, and the circuit breaker 3QF is also connected to the load through two sections of bus.

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