Three-phase load amplification, monitoring and feedback system

Abstract

The invention discloses a three-phase load amplification, monitoring and feedback system. Load current signals are sampled by current transformers; current sampling signals are subjected to amplification, filtering, isolation, signal voltage translation, rectification, output frequency multiplication, amplitude limiting and the like; after load voltage signals are sampled by voltage transformers;voltage sampling signals are subjected to amplification, voltage signal following, filtering, isolation, signal voltage translation, rectification, output frequency multiplication, amplitude limitingand the like; and therefore, the synchronous, instantaneous and high-precision sampling of three paths of voltage signals and three paths of current signals can be achieved. Data are transmitted to the communication server of a monitoring center through a wireless communication means composed of as a data processor, a wireless transmitting-receiving module and a wireless network; and therefore, the monitoring center can monitor the three-phase load of a power distribution network.

Description

technical field [0001] The invention relates to the technical field of electric three-phase load monitoring, in particular to a three-phase load amplification monitoring feedback system. Background technique [0002] With the rapid development and improvement of the national economy, the installed capacity and power consumption of the electric power industry have increased significantly, and the power grid has continued to expand. The requirements for power quality and reliability are getting higher and higher. my country's low-voltage distribution network basically adopts the three-phase four-wire distribution network method. Almost all distribution transformers have three-phase unbalanced phenomena, and the unbalanced rate is close to 100%. %, and some even reach more than 70%. In all low-voltage distribution networks such as residential quarters, industrial mines, and enterprises, three-phase imbalances are also very common, especially in residential quarters and rural pow...

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Problems solved by technology

[0003] The unbalanced three-phase load will generate unbalanced voltage, which will firstly increase the line loss and increase the power supply cost of the power department, and secondly, it will reduce the power supply efficiency of the line and distribution transformer, causing the line voltage to be out of phase, and the voltage at the end of the low-voltage phase to be out of phase. Low, in severe cases, it will cause electrical fire due to too much phase deviation, or burn the distribution transformer and other serious consequences. The three-phase load is seriously asymmetrical, and the neutral point potential will shift, and the line voltage drop and power will subsequently It will greatly increase, and the single-phase users connected to the heavy-duty phase are prone to problems such as low voltage, reduced electrical efficiency, and easy burning of motor equipment.

The single-phase users connected to the light load phase are prone to high voltage, which may cause electrical insulation breakdown, shorten the service life of electrical appliances or damage electrical appliances.

For power users, the unbalanced three-phase voltage will cause overheating of the motor, seriously affecting the quality of power supply and the safety of users' electricity consumption

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