Measurement and remote test combined power system voltage quality test system and method

Abstract

The invention provides a measurement and remote test combined power system voltage quality test system and a method, and belongs to the field of voltage quality detection systems. In the method, a database, a control module, an information acquisition module, a measurement module and a proofreading module are included, the information acquisition module stores acquired information of line length and cable type in the database, the control module extracts the information of various sections of cables reaching a user from the database and calculates the resistance of a line through the measurement module, the control module calculates the voltage drop of the line according to the resistance of the line, calculates the voltage of a switch at the tail end of the line according to the voltage drop of the line, and acquires the actual voltage of the switch at the tail end according to an electric energy meter at the tail end of the line, the actual voltage is proofread by the proofreading module, the quality of a power supply is fed back, and that whether the voltage quality of the power supply of the user is normal or not is detected.

Description

technical field [0001] The invention provides a power system voltage quality testing system and method combining calculation and remote testing, and belongs to the field of voltage quality testing systems. Background technique [0002] After the power plant sends out electric energy, it boosts the electric energy, and then transmits it to the substation of the urban distribution network through the transmission line, and then has a bus to transmit the electric energy to the urban distribution network. Due to the large scale of the power distribution network, long lines, and complex structure, in During the power transmission process, the aging of the line and the damage of the equipment may cause the quality of the power delivered to the user to be poor. If there is a power outage or a large voltage change, the existing distribution network automation system can detect and alarm, but if the voltage If the difference is small, resulting in poor voltage quality, it cannot be f...

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Problems solved by technology

[0002] After the power plant sends out electric energy, it boosts the electric energy, and then transmits it to the substation of the urban distribution network through the transmission line, and then has a bus to transmit the electric energy to the urban distribution network. Due to the large scale of the power distribution network, long lines, and complex structure, in During the power transmission process, the aging of the line and the damage of the equipment may cause the quality of the power delivered to the user to be poor. If there is a power outage or a large voltage change, the existing distribution network automation system can detect and alarm, but if the voltage If the difference is small, resulting in poor voltage quality, it cannot be found and dealt with in time

[0003] Since the power transmission is carried out at a higher voltage, the voltage we tested is the value after the secondary side of the voltage transformer passes through the connecting line. After passing through the voltage transformer and the connecting line, a voltage drop occurs in the secondary measurement. The measured value is not the real voltage value. Since the error of the secondary voltage drop is limited by accuracy, there is no good way to accurately, quickly and safely measure the secondary voltage drop.

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