Liquid crystal display multifunction instrument for real time electric power monitoring system

Abstract

An LCD multifunctional power instrument used in a real-time power monitoring system comprises an instrument shell, an LCD screen and a control knob which are arranged at the front side of the instrument shell, upper-line connecting terminals and lower-line connecting terminals arranged at the rear side of the instrument shell and a circuit board arranged inside the shell, and the circuit board further comprises a full-wave detection circuit and a fundamental-wave detection circuit. The LCD multifunctional power instrument can measure active power, reactive power, apparent power, active energy and reactive energy of fundamental waves, harmonic waves and full waves of various phases and mixed phases, meanwhile, the power instrument can measure a plurality of electrical energy parameters such as frequency, effective values, power factors and the like of voltage and current of various phases. The LCD multifunctional power instrument helps obtain desirable harmonic voltages and harmonic currents of various phases, and voltage harmonic occupancy and current harmonic occupancy by the online real-time detection of fundamental voltage and fundamental current and harmonic voltage and harmonic current of an electrical network with the help of operation relations among the full wave, the fundamental wave and the harmonic wave, and can display the date and the time, thus the LCD multifunctional power instrument can directly replace the conventional power transmitters and measuring instruments.

Description

technical field [0001] The invention relates to a power parameter measuring instrument for a power monitoring system, in particular to a power parameter measuring instrument suitable for energy management systems, substation automation, distribution network automation, community power monitoring, industrial automation, intelligent buildings, intelligent switchboards, and switch cabinets. The real-time power monitoring system uses liquid crystal display multi-function meters. The power parameter measuring instrument can measure common power parameters, such as three-phase voltage, current, harmonic voltage, harmonic current, harmonic voltage percentage, harmonic current percentage, active power, reactive power, frequency, power factor, Active (reactive) power, etc. Background technique [0002] Voltage quality is of great significance to the safe operation of the power system. Excessively high harmonics in the power grid cause excessive voltage pulses in the power grid and a...

AI Technical Summary

Problems solved by technology

With the development of the power system, many power components develop slowly, such as power parameter meters. The power meters on the market today have low precision and poor performance, and power parameter meters that do not have fundamental and harmonic detection functions can no longer meet today's requirements. The needs of the modern development of the electric power industry and the functional requirements of the electric power automation control system, such as the electric power control and dispatching system, SCADA system (substation data and safety monitoring integrated automation system, etc.)

Even with harmonic detection, it's very incomplete and doesn't really detect harmonics

Images