Electric energy quality monitoring and electric energy metering device that can be mounted and dismounted in an electrified manner at a high-tension side

Abstract

The invention relates to an electric energy quality monitoring and electric energy metering device that can be mounted and dismounted in an electrified manner at a high-tension side, and belongs to the technical field of electric energy quality on-line monitoring and electric energy metering. The device includes three current and voltage acquisition units, a CPU module, a low-tension side voltage energy-supplying power supply module, and a wireless communication module. Each current acquisition unit is connected to the CPU module and the low-tension side voltage energy-supplying power supply module. The low-tension side voltage energy-supplying power supply module and the communication module are connected to the CPU module. The device can be mounted without power being cut or lines being cut, is suitable for indoor and outdoor environments, has electric energy quality monitoring and electric energy metering functions, and has the characteristics of wide measurement range, wide response frequency band width and high accuracy within a wide operational temperature range.

Description

technical field [0001] The invention belongs to the technical field of online power quality monitoring and power metering, and in particular relates to a power quality monitoring and power metering device that can be assembled and disassembled on a high-voltage side with power on. Background technique [0002] Due to the expansion of the power network and the emergence of interconnected and large-scale combined power grids, the structure of the power grid is becoming more and more complex, and users have higher and higher requirements for the quality of power consumption, which makes the power supply department pay more attention to the quality of power consumption; The independent control of the equipment only based on the measured value of the installed measuring point can no longer meet the actual needs. [0003] Due to the variable operation of the distribution network and the penetration of various new energy sources and distributed power sources, under the performance ...

AI Technical Summary

Problems solved by technology

[0006] One is the high-voltage electromagnetic metering box, which generally adopts the design of a two-element electromagnetic transformer. Since the electromagnetic transformer has the disadvantages of "ferromagnetic resonance, easy magnetic saturation, and large self-loss", if it is used in main feeder lines such as trunk lines A large number of installations will reduce the safety and economics of grid operation

In addition, the secondary signal of the high-voltage electromagnetic metering box needs to be converted twice before it can be used by the low-voltage electric meter, so the secondary comprehensive error of the measurement is increased and the accuracy is reduced.

[0007] The second is the high-voltage electric energy meter, which generally still adopts a two-component design. Its use is limited to electric energy measurement, and it cannot meet the needs of electric quantity measurement for more purposes such as power quality, as well as the field of distribution automation measurement.

In addition, some high-voltage electric energy meters still use electromagnetic transformers. Except for some products that avoid the secondary conversion of signals by increasing the turn ratio, the problems existing in the above-mentioned high-voltage electromagnetic metering boxes still exist.

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