Three-phase electrical parameters fast acquisition module

Abstract

The invention provides a module for quickly collecting three-phase electrical parameters. The module comprises a power supply circuit, an electrical parameter input circuit, an electrical parameter processing circuit, a singlechip microcomputer operating circuit, a signal isolation circuit and an RS-485 communication circuit, wherein the power supply circuit is respectively connected with the electrical parameter input circuit, the electrical parameter processing circuit, the singlechip microcomputer operating circuit, the signal isolation circuit and the RS-485 communication circuit, the electrical parameter processing circuit is connected with the electrical parameter input circuit and the signal isolation circuit, and the singlechip microcomputer operating circuit is connected with the signal isolation circuit and the RS-485 communication circuit. The module has the advantages that by collecting the current and voltage of each phase in real time, the current effective value, the voltage effective value, the power factor, the active power and the reactive power of each phase and the total active power, the total reactive power, the total apparent power, the total active energy and the total reactive energy of three phases can be acquired; the electrical parameters can be transmitted outwards by an RS-485 interface, and an MODBUS communication protocol is accorded with; the module is compatible for wiring modes such as a three-phase three-line mode or a three-phase four-line mode.

Description

technical field [0001] The invention relates to a collection module, in particular to a fast collection module of three-phase electrical parameters. Background technique [0002] China is one of the countries with the lowest per capita energy reserves in the world. Per capita energy consumption is only half of the world average. However, the energy utilization efficiency is only about 30%, which is about 10 percentage points lower than that of developed countries. The energy consumption of production value is more than 2 times higher than the world average level, and it is one of the countries with the highest energy consumption of production value in the world. Thermal power generation is the main source of electricity in China (accounting for about 81%), and the raw material for power generation is coal. However, China has changed from the largest coal producer and consumer to an importer, and the cost of electricity will continue to rise as a result. With the rapid dev...

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Problems solved by technology

Although the price of the current transformer is relatively low, there are hysteresis and saturation phenomena caused by the phase shift, resulting in phase error during measurement, which affects the measurement accuracy; at the same time, the dynamic current sensing range of the current transformer is small, and it does not have the characteristics of fast monitoring

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