CN204885052U - Intelligence residual current recloses circuit breaker - Google Patents

Abstract

The utility model discloses an intelligent residual current reclosing circuit breaker, in which a motor (10), four conductive static contacts (2), a zero-sequence transformer (11), an external circuit A, B, C, and N are respectively connected to four static contacts (2), the motor (10) is connected to the gear assembly (9), the gear assembly (9) is connected to the connecting rod assembly (8), and the connecting rod assembly (8) is connected to the handle (5 ), the handle (5) is connected to four conductive contacts (3), each conductive contact (3) is connected to a conductive conductor (7), and each conductive conductor (7) is connected to an output terminal (12) , the zero-sequence transformer (11) is set next to the four conductors (7), the conductive moving contact (3) is connected to the spring (4), the spring (4) is connected to the release (6), and the intelligent control board (1) The zero-sequence transformer (11), the motor (10) and the release device (6) are respectively connected. The utility model has the advantages of small volume, compact structure, strong breaking capacity, safe switching and improved reliability.

Description

An intelligent residual current reclosing circuit breaker

Technical field:

The utility model relates to an intelligent residual current reclosing circuit breaker, which belongs to the technical field of low-voltage power supply lines in the electric power industry.

Background technique:

The State Grid clearly stipulates the use of residual current circuit breakers in 400V low-voltage lines as an indirect measure to protect personal electric shock safety. When there is leakage in the line, the circuit breaker will automatically break the protection.

In order to ensure the electricity consumption of residents, it is required to implement dual transformer power supply in the newly renovated station area, and the capacity of each transformer can meet the electricity consumption of the entire station area. But the two transformers come from two 10KV power sources, and a dual power switching device is installed between the low-voltage sides of the two transformers. Usually, each transformer works at half load, which improves the reliability of operation and also leaves a backup margin for reorganization for further expansion of the station area. Once a transformer line fails and the power is cut off, the dual power switching device automatically transfers the load of the power-off transformer to the output circuit of the intact transformer to ensure safe power supply in the station area.

However, when the intelligent leakage circuit breaker currently on the market is opened and closed, it only operates on the three live wires A/B/C, and the neutral line N at the input and output ends is always in a connected state. In the low-voltage station area line that adopts dual power supply automatic switching, since the neutral line N is not cut off, it is easy to generate instantaneous overcurrent, damage the intelligent leakage circuit breaker, and cause power failure in the power supply area.

Utility model content:

The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art and provide an intelligent residual current reclosing circuit breaker with small volume, compact structure, strong breaking capacity, safe switching and improved reliability.

The purpose of this utility model can be achieved through the following measures: an intelligent residual current reclosing circuit breaker, which includes a casing, is characterized in that a motor, four conductive static contacts, a zero-sequence transformer, and an external circuit A , B, C, and N are respectively connected to four static contacts, the motor is connected to the gear assembly, the gear assembly is connected to the connecting rod assembly, the connecting rod assembly is connected to the handle, the handle is connected to four conductive moving contacts, and each conductive moving contact is connected to a Conductive conductors, each conductive conductor is connected to an output terminal, the zero-sequence transformer is arranged next to the four conductors, the conductive movable contact is connected to the spring, the spring is connected to the release, and the intelligent control board is respectively connected to the zero-sequence transformer, motor, trip unit.

Compared with the prior art, the utility model can produce the following positive effects: the utility model changes the original only dividing and combining A/B/C three live wires into the neutral line N and the A/B/C three live wires to divide and combine together Gate operation, using this kind of intelligent leakage circuit breaker in the low-voltage station area line with automatic switching of dual power supplies, will not produce instantaneous overcurrent, switching is safe, and reliability is improved, which can effectively avoid failures caused by switching between dual power supplies.

Description of drawings:

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the sectional side view of the utility model;

Fig. 3 is the electrical schematic diagram of the utility model.

The specific embodiment: the specific embodiment of the present utility model is described in detail below in conjunction with accompanying drawing:

Embodiment: An intelligent residual current reclosing circuit breaker (see Fig. 1-Fig. 3), which includes a casing 13, inside which is provided a motor 10, four conductive static contacts 2, a zero-sequence transformer 11, and an external circuit A, B, C, N are respectively connected to the four static contacts 2 of the circuit breaker, the motor 10 is connected to the gear assembly 9, the gear assembly 9 is connected to the connecting rod assembly 8, the connecting rod assembly 8 is connected to the handle 5, and the handle 5 is connected to the four guides Electric contacts 3, each conductive electric contact 3 is connected to a conductive conductor 7, each conductive conductor 7 is connected to an output terminal 12, zero sequence transformer 11 is arranged next to the four electric conductors 7, and electric conductive contact 3 The spring 4 is connected, and the spring 4 is connected to the release device 6. The intelligent control board 1 is respectively connected to the zero-sequence transformer 11, the motor 10, and the release device 6.

The external lines A, B, C, and N are respectively connected to the four static contacts 2 of the circuit breaker. When the circuit breaker is closed, the four static contacts 2 are respectively connected to the four moving contacts 3, and the three external lines are connected to each other. The four-phase four-wire power supplies A, B, C, N are respectively connected to four moving contacts 3 through four static contacts 2, and then respectively connected to conductors 7, and respectively connected to output terminals 12 to provide external lines with Three-phase four-wire 380V power supply with leakage protection function. The zero-sequence transformer 11 is installed next to the four conductors 7, and obtains the leakage signal of the output line through electromagnetic induction, and provides the intelligent control board 1 with a line leakage criterion.

Basic working principle:

The intelligent control board 1, by detecting the leakage data of the zero-sequence transformer 11, when there is no leakage in the output line, outputs a control signal to the motor 10 to rotate, through the gear assembly 9, drives the connecting rod assembly 8 to push the handle 5 forward, and presses the guide The electric contact 3 is closed with the conductive static contact 2 . The circuit breaker is in the closed state, and the current in the input line is supplied to the load through the conductive static contact 2, the conductive movable contact 3, the conductive conductor 7, and the output terminal 12.

When the intelligent control board 1 obtains leakage data in the line by detecting the zero-sequence transformer 11, it outputs a control signal to power up the release 6, so that the spring 4 rebounds, and the conductive movable contact 3 and the conductive static contact 2 are separated. The circuit breaker is opened, and the output terminal 12 has no voltage and current output, which plays the role of leakage protection.

The utility model adds conductors to four sets of separable conductive contacts, so that the zero line N at the input end and the three live lines A/B/C and the zero line N at the output end and the three live lines A/B/C are simultaneously controlled to open and close operate.

Claims (1)

1. an intelligent residual current reclosing breaker, it comprises shell (13), it is characterized in that being provided with motor (10) in shell (13), four conductions fixed contact (2), zero-sequence transformer (11), outside line A, B, C, N connects four fixed contacts (2) respectively, motor (10) connects gear assembly (9), gear assembly (9) connects link assembly (8), link assembly (8) connects handle (5), handle (5) connects four conductive moving contacts (3), each conductive moving contact (3) all connects an electric conductor (7), each electric conductor (7) all connects a lead-out terminal (12), zero-sequence transformer (11) is located at four electric conductor (7) sides, conductive moving contact (3) linking springs (4), spring (4) connects release (6), Intelligent control board (1) connects zero-sequence transformer (11) respectively, motor (10), release (6).