Intelligent low-voltage transformer area switchgear

Abstract

The invention relates to intelligent low-voltage transformer area switch equipment, which comprises a base, a middle cover, an upper cover, a main circuit board, a handle and an opening and closing mechanism, a main conductor and a contact system are arranged between the base and the middle cover, the main circuit board is also provided with a power panel, a display screen, keys and a power switch, and the main circuit board controls the opening and closing mechanism to drive the handle to move. The main circuit board further comprises two microprogrammed control units (MCU), a communication module, a voltage sampling circuit, a current sampling circuit and a residual current sampling circuit, one MCU is used for normal protection monitoring and is responsible for communication strategy monitoring of the whole equipment, and the other MCU is used for communication strategy monitoring of the whole equipment. And the other MCU is specially used for sampling voltage, current and residual current in real time, calculating harmonic components in the line, recording the harmonic components regularly and storing 4s line parameter waveform data points in the RAM. The system has the advantages of abundant functions, small volume and high intelligent degree, shortens the fault finding time, and greatly reduces the labor intensity of distribution network operation and maintenance personnel.

Description

technical field [0001] The invention relates to the technical field of power distribution network equipment, and more specifically relates to an intelligent low-voltage station area switchgear. Background technique [0002] With the rapid development of the economy, more and more high-power industrial electrical equipment and civilian electrical equipment are connected to the distribution network. Especially in rural areas, the demand for electricity continues to grow, but there is still a big gap between the existing rural power grids and the power grids in general cities and developed areas. Mainly reflected in the following aspects: [0003] (1) The grid structure in rural areas is weak. Rural power grids are mostly radial networks, with a small ring network power supply range, long power supply radius, small wire diameter, poor load transfer capability, large accident and power outage range, and poor power supply reliability. [0004] (2) Lack of long-term planning, b...

AI Technical Summary

Problems solved by technology

Rural power grids are mostly radial grids, with a small ring network power supply range, long power supply radius, small wire diameter, poor load transfer capability, wide range of accidents and power outages, and poor power supply reliability

[0004] (2) Lack of long-term planning, busy with existing problems

Due to the lack of planning, the distribution transformers of the rural power grid are unreasonably distributed, and the low-voltage outlet circuit is tortuous, which directly leads to a high failure rate of the rural power outlet circuit.

[0005] (3) Lack of comprehensive management, lack of low-voltage user information, and low management level

Due to the low level of management, it is impossible to predict failures in advance, and the failure rate occurs frequently, causing certain economic losses

[0006] (4) Low-voltage switch protection of distribution network is difficult to distinguish between instantaneous fault and ground fault

It cannot meet the requirements of accurate protection of personal electric shock safety and high reliability of power supply

[0007] (5) Low level of integration of protection equipment functions

The terminal switchgear in the branch box or meter box in the existing distribution transformer area only has the conventional overcurrent tripping protection function, and lacks the functions of real-time monitoring and recording of operation information, fault identification and positioning, and monitoring of power quality parameters, etc.

[0008] (6) The installation applicability of intelligent power distribution equipment is low

At present, in addition to the residual current protection device, the addition of power management equipment and public energy service equipment in the low-voltage distribution network has brought more problems and hidden dangers to the low-voltage distribution network.

The setting parameters, operating data, alarm transmission of various equipment, as well as data integration statistics, analysis and judgment have not been effectively collected and monitored, which has brought many problems and challenges to the relevant staff of the power department

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