CN210927120U - Distributed photovoltaic grid-connected access box device - Google Patents

Abstract

A distributed photovoltaic grid-connected access box device comprises: the intelligent power distribution system comprises a wire inlet unit (10), a metering unit (20), a power distribution intelligent terminal unit (30) and a feeder unit (40); the metering unit (20), the terminal unit (30) and the feeder unit (40) are electrically connected with the wire inlet unit (10); the metering unit (20) and the intelligent power distribution terminal unit (30) are electrically connected with the feeder unit (40). The distributed photovoltaic grid-connected access box device can ensure the safe and stable operation of a power grid and ensure the safety and reliability of equipment and a system; the equipment is reasonable in type selection, and various technical and economic indexes are optimized; the method comprehensively considers the actual conditions of each region, and can adapt to different scales, different forms and different external conditions. The coordination between the levels of each layer of power grid operation is realized according to the technical specifications of grid connection and access of a photovoltaic power supply, and the openness of a photovoltaic poverty relief project is improved.

Description

Distributed photovoltaic grid-connected access box device

Technical Field

The utility model relates to a distributing type photovoltaic is incorporated into power networks and is inserted the case device, especially relates to a distributing type photovoltaic of electric wire netting side is incorporated into power networks and is inserted case device.

Background

The energy is an indispensable basic condition for modern social life and production, and a well-off society cannot be really built without sufficient and reliable energy guarantee. The method improves the general service level of energy in the poor regions, is an essential requirement for comprehensively establishing a well-being society, reasonably develops and utilizes the energy resources in the poor regions, and is an important way for driving the economic development and the improvement of the livelihood of the poor regions. In order to deeply implement the spirit of a central poverty relief development work meeting and fully play the basic role of energy development and construction in poverty relief attack and solidness fighting, poverty relief of national energy authorities and state institutes implements photovoltaic poverty relief engineering, thereby accelerating the development and utilization of energy resources and the construction of infrastructure in poverty-stricken areas, promoting the conversion of resource advantages into economic development advantages as soon as possible, and promoting the economic development and the improvement of livelihood areas. At present, a distributed photovoltaic grid-connected access device which meets the requirement of distributed photovoltaic and power grid adaptability and realizes coordination among all levels of power grid operation is absent in the prior art.

SUMMERY OF THE UTILITY MODEL

In order to meet the requirement of distributed photovoltaic and power grid adaptability, the design principle of safety, reliability, advanced technology, reasonable investment, unified standard and high-efficiency operation is followed, and the selection of the design scheme needs to have universality, expandability and economy; it is not too large but wide in coverage. The design strives to realize the standardization of distributed photovoltaic access, creates conditions for equipment bidding, reducing the construction and operation cost of an access system, and meets the actual technical requirements of distributed photovoltaic and power grid construction.

The utility model provides a distributed photovoltaic grid-connected access box device, which comprises a wire inlet unit, a metering unit, a power distribution intelligent terminal unit and a feeder unit; the inlet wire unit is electrically connected with the metering unit; the incoming line unit is electrically connected with the intelligent power distribution terminal unit; the wire inlet unit is electrically connected with the feeder line unit; the metering unit is electrically connected with the feeder line unit; and the power distribution intelligent terminal unit is electrically connected with the feeder line unit.

Further, the incoming line unit comprises a fuse-type disconnector.

Further, the metering unit comprises a concentrator, an electric energy meter and a current transformer; the concentrator is connected to one end of the electric energy meter, and the other end of the electric energy meter is connected with the current transformer to monitor the electric energy flowing through the current transformer; one end of the current transformer is electrically connected with the wire inlet unit, and the other end of the current transformer is electrically connected with the feeder line unit.

Furthermore, the power distribution intelligent terminal unit comprises a four-remote integrated device and a current transformer which integrate remote measurement, remote control, remote regulation and remote signaling; the four-remote integrated device is connected to one end of a current transformer, and the input end and the output end of the current transformer are respectively connected with the incoming line unit and the feeder line unit.

Further, the feeder unit comprises a circuit breaker with residual current action protection and a lightning arrester.

The technical scheme of the utility model beneficial effect who brings does:

1) safety: the safe and stable operation of the power grid and the safety and reliability of the equipment and the system are ensured.

2) Economy: according to the principle of maximizing benefits of all parties, harmonious and unified construction of distributed photovoltaic and power grids is pursued, and win-win is achieved.

3) The method is applicable to the following steps: the equipment is reasonable in type selection, various technical and economic indexes are optimized, and the main technical and economic indexes reach the advanced level of similar domestic projects. The method comprehensively considers the actual conditions of each region, and can adapt to different scales, different forms and different external conditions.

4) The method is practical: the economic and social development level, the user property and the environmental requirement of the poverty-stricken area are considered, the design scheme is optimized, and differentiated construction standards are adopted.

5) Coordinating: and the coordination between the operation layers of the power grid is realized according to the technical specifications of grid connection and access of the photovoltaic power supply. According to the requirement of practically improving the economic and social development of the poverty-relieved area and the relevant government policies, the openness of the photovoltaic poverty-relieving project is improved.

Drawings

Fig. 1 is the utility model discloses well photovoltaic grid-connected access case device's the schematic diagram of constituteing the structure module.

Fig. 2 is the utility model discloses well photovoltaic grid-connected access box measurement unit constitutes the schematic diagram of structure.

Fig. 3 is the utility model discloses well photovoltaic grid-connected access box distribution intelligent terminal unit constitute and construct the schematic diagram.

Wherein the drawings are described as follows:

10. a wire inlet unit; 20. a metering unit; 30. a power distribution intelligent terminal unit; 40. a feeder unit; 2001. a concentrator; 2002. an electric energy meter; 2003. a current transformer; 3001. a four-remote integrated device; 3002. a current transformer.

The above-mentioned drawings use and carry out supplementary explanation to the technical scheme of the utility model to help clearly understand the utility model. However, the drawings are not intended to limit the present invention. Furthermore, the contents of the drawings are not to scale and should not be interpreted as limiting the invention. The whole or the constituent parts of the contents shown in the drawings can be combined and changed based on the technology of the art.

Detailed Description

Referring to fig. 1, the distributed photovoltaic grid-connected access box device of the present invention specifically includes: the intelligent terminal comprises an incoming line unit 10, a metering unit 20, a distribution intelligent terminal unit 30 and a feeder unit 40. In this embodiment, the line-incoming unit 10 includes a fused disconnector, and the metering unit 20 includes a concentrator 2001, an electric energy meter 2002, and a current transformer 2003; the intelligent power distribution terminal unit 30 comprises a four-remote integrated device 3001 and a current transformer 3002 which integrate remote measurement, remote control, remote regulation and remote signaling; the feeder unit 40 includes a circuit breaker with residual current action protection and a lightning arrester.

Wherein, the incoming line unit 10 is electrically connected with the metering unit 20; the incoming line unit 10 is electrically connected with the intelligent power distribution terminal unit 30; the incoming line unit 10 is electrically connected with the feeder line unit 40; the metering unit 20 is electrically connected with the feeder unit 40; the distribution intelligent terminal unit 30 is electrically connected with the feeder unit 40.

The concentrator 2001 in the metering unit of fig. 2 is electrically connected to the electric energy meter 2002; the electric energy meter 2002 is electrically connected with the current transformer 2003; wherein, the concentrator 2001 is connected to one end of the electric energy meter 2002, and the other end of the electric energy meter is connected to the current transformer 2003 to monitor the electric energy flowing through the current transformer 2003; the current transformer 2003 has one end electrically connected to the inlet unit 10 and the other end electrically connected to the feeder unit 40.

Fig. 3 a communication data acquisition quad-rocker 3001 in the power distribution intelligent terminal unit is electrically connected with a current transformer 3002; the four-remote integrated device 3001 is connected to one end of the current transformer 3002, and an input end and an output end of the current transformer 3002 are respectively connected to the incoming line unit 10 and the feeder line unit 40.

In the specific implementation of the distributed photovoltaic grid-connected access box device, the distributed photovoltaic grid-connected access box device is divided into two types of centralized access and decentralized access according to the form of a photovoltaic project access system, wherein the centralized access scheme is divided into two schemes of centralized access of a special pole transformer and low-voltage special line access of a public pole transformer, and the decentralized access scheme is a scheme of household access of a low-voltage public power grid. The design content comprises the design of related schemes of an access system scheme, the selection of electrical primary equipment, system relay protection and safety automation devices, system communication and metering.

(1) The scheme is mainly suitable for light distribution type photovoltaic projects of village collective centralized access, centralized metering and all internet surfing, the total installed capacity is generally 80 kW-400 kW, and a grid-connected line generally adopts 2 loops. The photovoltaic grid-connected access box suitable for the scheme needs to be redesigned, and installation positions of functional modules such as a 2-loop incoming line, a 1-loop outgoing line, a meter, a collection terminal and a residual current operated protector are met, and a special grid-connected circuit breaker is selected.

(2) The scheme is mainly suitable for distributed photovoltaic projects of village collective access, collective metering and all internet surfing, and the common connection point is a low-voltage bus of the transformer on the public column, and the general installed total capacity is 20-200 kW. Generally, a grid-connected line adopts 1 circuit. The scheme is designed according to determined preset conditions, 1 loop of special line access position needs to be reserved in the original low-voltage comprehensive distribution box, and a photovoltaic grid-connected access box needs to be additionally installed on the site. The photovoltaic grid-connected access box applicable to the scheme needs to be redesigned, a grid-connected special breaker is selected, and the installation positions of a meter and a collection terminal are reserved. The photovoltaic inlet wire should adopt the cable access mode, if adopt the built on stilts access mode of wire, should avoid the same pole of low pressure multiloop to erect.

(3) Household access scheme for low-voltage public power grid

The scheme is mainly suitable for distributed photovoltaic projects with 220V (380V) voltage level access and full internet access on the roofs of residents, the public connection points are low-voltage lines of a public power grid, and installed capacity is not more than 8 kW. The design should be developed according to the predetermined condition of confirming, and anti-isolated island device should be installed near the block terminal should be synthesized to the low pressure, and near the photovoltaic grid-connected point should install photovoltaic grid-connected access box additional. The photovoltaic grid-connected access box suitable for the scheme needs to be redesigned. Each low-voltage outgoing line of the low-voltage comprehensive distribution box is designed according to a set of shared anti-island device, selective switching with each low-voltage outgoing line is realized in the anti-island device, and an auxiliary contact is provided by a low-voltage outgoing line switch to realize an electrical locking function of selective switching of the anti-island device and the low-voltage outgoing line; and a special grid-connected circuit breaker is selected as the photovoltaic grid-connected access box, and the installation positions of the meter and the acquisition terminal are reserved.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (5)

1. The utility model provides a distributed photovoltaic grid-connected access case device which characterized in that, this grid-connected access case device includes: the intelligent power distribution system comprises a wire inlet unit (10), a metering unit (20), a power distribution intelligent terminal unit (30) and a feeder unit (40); the metering unit (20), the power distribution intelligent terminal unit (30) and the feeder line unit (40) are electrically connected with the wire inlet unit (10); the metering unit (20) and the intelligent power distribution terminal unit (30) are electrically connected with the feeder unit (40).

2. The distributed photovoltaic grid-connected access box device according to claim 1, characterized in that: the line inlet unit (10) comprises a fuse type isolating switch.

3. The distributed photovoltaic grid-connected access box device according to claim 1, characterized in that: the metering unit (20) comprises a concentrator (2001), an electric energy meter (2002) and a current transformer (2003); wherein the concentrator (2001) is connected to one end of the electric energy meter (2002), and the other end of the electric energy meter is connected with the current transformer (2003) to monitor the electric energy flowing through the current transformer (2003); one end of the current transformer (2003) is electrically connected with the incoming line unit (10), and the other end is electrically connected with the feeder line unit (40).

4. The distributed photovoltaic grid-connected access box device according to claim 1 or 2, characterized in that: the intelligent power distribution terminal unit (30) comprises a four-remote integrated device (3001) and a current transformer (3002), wherein the four-remote integrated device integrates remote measurement, remote control, remote regulation and remote signaling; the four-remote integrated device (3001) is connected to one end of the current transformer (3002), and the input end and the output end of the current transformer (3002) are respectively connected with the incoming line unit (10) and the feeder line unit (40).

5. The distributed photovoltaic grid-connected access box device according to claim 1 or 2, characterized in that: the feeder unit (40) includes a circuit breaker and a lightning arrester.

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