CN222673672U - Low-voltage grid-connected cabinet with fault-removal automatic reclosing function - Google Patents

Abstract

The utility model relates to the technical field of electrical cabinets, in particular to a low-voltage grid-connected cabinet with an automatic reclosing function for removing faults, which comprises a cabinet body frame, a metering chamber, a breaker chamber, a line inlet and outlet cable chamber, a breaker, a relay protection device and a current transformer, wherein the breaker is arranged in the breaker chamber, the lower end of the breaker is connected with a photovoltaic separation switch or an energy storage side, the upper end of the breaker is connected with a power grid side bus, a metering transformer is arranged on a power grid side copper bar, a metering chamber is provided with a bidirectional meter, a current transformer is arranged at the cable end, far away from the grid-connected breaker, of the power grid and the energy storage side, the relay protection device collects currents at the two ends for comparison, and the breaker is driven to trip according to a current difference value. According to the utility model, through setting the relay protection device to collect the currents at two ends and comparing, differential protection and tripping of the circuit breaker are realized according to the current difference value, automatic reclosing can be realized, manual operation closing is not required to be carried out on site by a person on duty, and convenience and safety are greatly improved.

Description

Low-voltage grid-connected cabinet with fault-removal automatic reclosing function

Technical Field

The utility model relates to the technical field of electrical cabinets, in particular to a low-voltage grid-connected cabinet with an automatic reclosing function for fault removal.

Background

Along with the development of social economy and the improvement of environmental protection consciousness, the demands of people on clean energy are stronger and the application of photovoltaic and energy storage systems is more and more, the application of the photovoltaic and energy storage systems and the like is required to be combined with a power grid system when the system is used, the stability of the photovoltaic and energy storage systems is extremely important, otherwise, the normal electricity of the power grid is easily influenced to a certain extent, once the system has a fault, the fault is required to be immediately cut off, the grid-connected cabinet circuit breaker is disconnected, and the grid-connected cabinet circuit breaker is closed after the fault is released. At present, the grid-connected cabinets on the market only carry out short-circuit protection on the load side of the circuit breaker, after the fault is relieved, manual field operation is needed for switching on, particularly when the distance of the grid-connected cabinets is far, unnecessary troubles are caused for engineering personnel, and certain specific protection required for photovoltaic and energy storage is not comprehensive enough. According to the current situation in the market, the applicant decides to develop a low-voltage grid-connected cabinet with automatic reclosing for fault removal.

Disclosure of utility model

Aiming at the defects in the prior art, the utility model provides the low-voltage grid-connected cabinet with the automatic reclosing function for removing faults, the current at two ends is collected by arranging the relay protection device, and comparing, differential protection and breaker tripping are realized according to the current difference value, automatic reclosing can be realized, manual operation closing is not needed to be carried out on site by a person on duty, and convenience and safety are greatly improved.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

The utility model provides a possess low-voltage grid-connected cabinet that excision trouble was reclosed automatically, includes cabinet body frame, measuring room, circuit breaker room, business turn over line cable room, circuit breaker, overload protection device and current transformer, the circuit breaker is installed in the circuit breaker room, photovoltaic separation switch or energy storage side are connected to the circuit breaker lower extreme, electric wire netting side generating line is connected to the circuit breaker upper end, and the measuring transformer is installed to electric wire netting side copper bar, the measuring room is provided with two-way strapping table, current transformer sets up in electric wire netting and energy storage side keep away from the cable end of grid-connected circuit breaker, overload protection device gathers the electric current at both ends and compares to trip according to electric current difference drive circuit breaker.

Preferably, the front end of the cabinet frame is provided with a grid-connected side isolating switch, a grid-connected side main switch and a plurality of electric operation indicator lamp buttons, and the rear end of the cabinet frame is provided with the metering transformer and the photovoltaic sub-switch.

Preferably, the metering chamber, the breaker chamber, the incoming and outgoing cable chamber, the breaker, the relay protection device and the current transformer are all arranged on the cabinet frame.

Preferably, the relay protection device comprises a relay, a current measurement loop and a voltage measurement loop, and the circuit breaker, the current measurement loop and the voltage measurement loop are electrically connected with the relay.

Preferably, the current transformer is electrically connected with the relay through a current signal loop.

Preferably, the metering transformer is electrically connected with the relay through an open output loop.

The low-voltage grid-connected cabinet has the advantages that the circuit breaker in the low-voltage grid-connected cabinet is arranged in the circuit breaker chamber, the lower end of the circuit breaker is connected with a photovoltaic disconnecting switch or an energy storage side, the upper end of the circuit breaker is connected with a power grid side bus, a metering transformer is arranged on a power grid side copper bar, a bidirectional meter is arranged in the metering chamber, the current transformer is arranged at a cable end of the power grid and the energy storage side far away from the grid-connected circuit breaker, the relay protection device collects currents at two ends for comparison and drives the circuit breaker to trip according to current difference values, the relay protection device collects currents at two ends and compares the currents according to current difference values, differential protection action is achieved when the currents are inconsistent before and after the circuit breaker trips, the relay protection device is reset successfully, the relay protection device can achieve automatic reclosing, the relay protection device can also collect voltages at two sides of the power grid and the energy storage system, when the voltages or the frequencies at two sides are detected to be inconsistent, the relay protection can act, the two sides of the energy storage system is cut off, the voltage or the frequency of the relay protection device is restored automatically, normal operation of the relay protection system is achieved, and the safety of the grid-connected cabinet is improved, and the safety of workers is improved.

Drawings

FIG. 1 is a front view of the present utility model;

FIG. 2 is a rear view of the present utility model;

FIG. 3 is a cross-sectional view of the present utility model;

FIG. 4 is an electrical schematic of the present utility model;

In the figure, a 1-cabinet frame, a 2-metering chamber, a 3-breaker chamber, a 4-incoming and outgoing cable chamber, a 5-breaker, a 6-relay protection device, a 7-current transformer, an 8-grid-connected side isolating switch, a 9-grid-connected side main switch, a 10-electric operation indicator button, an 11-metering transformer, a 12-photovoltaic separation switch and a 13-relay.

Detailed Description

The following describes the embodiments of the present utility model further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present utility model, but is not intended to limit the present utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

As shown in fig. 1-4, the low-voltage grid-connected cabinet with automatic reclosing for fault removal comprises a cabinet body frame 1, a metering room 2, a breaker room 3, a line-in and line-out cable room 4, a breaker 5, a relay protection device 6 and a current transformer 7, wherein the breaker 5 is installed in the breaker room 3, the lower end of the breaker 5 is connected with a photovoltaic separation switch or an energy storage side, the upper end of the breaker 5 is connected with a bus on the side of a power grid, a metering transformer 11 is installed on a copper bar on the side of the power grid, the metering room 2 is provided with a bidirectional meter, the current transformer 7 is arranged at the cable ends of the power grid and the energy storage side, which are far away from the breaker, the relay protection device 6 collects currents at two ends, compares the currents and drives the breaker 5 to trip according to current difference values, it can be understood that the relay protection device collects currents at the two ends, when the currents are inconsistent, the difference protection action is achieved when the currents are inconsistent, after the relay protection device is reset successfully, the breaker can realize automatic reclosing, the relay protection device can also collect voltages at two sides, the voltage on the power grid and the two sides can realize automatic reclosing, when the voltage protection frequency of the energy storage systems are cut off, the frequency of the voltage protection system is restored to the frequency of the power grid, or the frequency of the two sides of the energy storage systems is not consistent, the frequency is recovered, and the frequency of the automatic reclosing is recovered, and the safety voltage system is convenient when the frequency is recovered, and the frequency is high, and the voltage on the two sides of the voltage system is recovered, or when the voltage frequency is recovered.

The intelligent cabinet temperature control system comprises a cabinet body frame 1, and is characterized in that a grid-connected side isolating switch 8, a grid-connected side main switch 9 and a plurality of electric operation indicator lamp buttons 10 are arranged at the front end of the cabinet body frame 1, the metering transformer 11 and a photovoltaic isolating switch 12 are arranged at the rear end of the cabinet body frame 1, the metering chamber 2, a circuit breaker chamber 3, a line inlet and outlet cable chamber 4, a circuit breaker 5, a relay protection device 6 and a current transformer 7 are arranged on the cabinet body frame 1, the relay protection device 6 comprises a relay 13, a current measurement loop and a voltage measurement loop, the circuit breaker 5, the current measurement loop and the voltage measurement loop are electrically connected with the relay 13, the current transformer 7 is electrically connected with the relay 13 through a current signal loop, and the metering transformer 11 is electrically connected with the relay 13 through a quantity outlet loop.

The utility model has the advantages of reasonable design and unique structure, 1, adopting low-voltage comprehensive relay protection with differential protection function to protect the current on both sides of the power supply and the energy storage of the circuit breaker, more effectively ensuring the safety of the energy storage system, 2, utilizing comprehensive relay protection to protect the voltage and the frequency of the system, ensuring the consistency of the power supplies on both sides, ensuring the grid connection to be safer and more reliable, 3, the circuit breaker has reclosing function, and after the system fault is relieved, realizing automatic reclosing, avoiding the manual operation closing on site by a person on duty, and recovering the power supply system.

The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the utility model, and yet fall within the scope of the utility model.

Claims (6)

1. The low-voltage grid-connected cabinet is characterized by comprising a cabinet body frame, a metering chamber, a breaker chamber, an in-out cable chamber, a breaker, a relay protection device and a current transformer, wherein the breaker is arranged in the breaker chamber, the lower end of the breaker is connected with a photovoltaic separation switch or an energy storage side, the upper end of the breaker is connected with a power grid side bus, the metering chamber is provided with a bidirectional meter, the current transformer is arranged at a cable end, far away from the grid-connected breaker, of the power grid and the energy storage side, and the relay protection device collects currents at two ends to compare and drives the breaker to trip according to a current difference value.

2. The low-voltage grid-connected cabinet of claim 1, wherein a grid-connected side isolating switch, a grid-connected side main switch and a plurality of electric operation indicator lamp buttons are arranged at the front end of the cabinet frame, and the metering transformer and the photovoltaic sub-switch are arranged at the rear end of the cabinet frame.

3. The low-voltage grid-connected cabinet of claim 1, wherein the metering chamber, the breaker chamber, the incoming and outgoing cable chamber, the breaker, the relay protection device and the current transformer are all arranged on the cabinet body frame.

4. The low-voltage grid-connected cabinet of claim 1, wherein the relay protection device comprises a relay, a current measurement loop and a voltage measurement loop, and the circuit breaker, the current measurement loop and the voltage measurement loop are electrically connected with the relay.

5. The low-voltage grid-connected cabinet of claim 4, wherein the current transformer is electrically connected with the relay through a current signal loop.

6. The low-voltage grid-connected cabinet of claim 4, wherein the metering transformer is electrically connected with the relay through an open output loop.