Standard measurement unit and method used for electric energy metering remote on-line monitoring system

Abstract

The present invention relates to a monitoring system, and discloses a standard measurement unit and method used for an electric energy metering remote on-line monitoring system. The standard measurement unit used for the electric energy metering remote on-line monitoring system comprises a current input card, a voltage input card, a load sampling card, an error calculating card and a motherboard, and the current input card, the voltage input card, the load sampling card and the error calculating card are all connected with the motherboard to transmit the signals mutually. The measurement signals are inputted from the current input card, the voltage input card, the load sampling card and the error calculating card separately and are processed, and then a standard electric energy pulse signal is outputted via the motherboard. According to the present invention, by adopting a secondary loop measurement method and a pulse comparison method, and by the error calculating card, various functions, such as the standard measurement, the error calculation, the offline setting, the system calibration, etc., are realized, so that the monitoring system possesses a stronger anti-interference capability and a higher reliability, and the measurement precision of the monitoring system is also improved substantially.

Description

technical field [0001] The invention relates to a monitoring system, in particular to a standard measuring unit used in a remote on-line monitoring system for electric energy metering and a method thereof. Background technique [0002] Electric energy metering is an important part of the economic work of the electric power industry sector. To ensure the accurate and reliable operation of electric energy metering devices is an important basis for production organization, operation management and leadership decision-making. With the deepening of the reform of the power system, especially after the separation of the power plant and the grid, the technical management requirements for the electric energy metering and monitoring system are getting higher and higher. However, due to the limitation of technical means, especially the measurement unit in the monitoring system, there is still measurement accuracy There are many problems such as low monitoring efficiency, long inspectio...

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Problems solved by technology

[0004] The present invention aims at the following disadvantages in the existing standard measurement unit used in the remote on-line monitoring system for electric energy metering in the prior art: First, the measurement unit lacks a secondary loop measurement method, which makes the measurement accuracy low, and ultimately affects the measurement accuracy of the monitoring system ; Second, the measurement unit lacks measurement error detection and calculation functions. Due to real-time changes in the on-site load conditions, the power factor also changes in real time, especially affected by the temporary transient process, and the system error is also constantly changing during on-site operation. The measurement unit The lack of error detection and calculation functions greatly reduces the accuracy of the measurement accuracy, thereby greatly reducing the measurement accuracy of the monitoring system; the third is that in the case of the main and auxiliary meters installed on site, it cannot meet the simultaneous monitoring and verification of the active power of the main and auxiliary meters or The reactive power error greatly reduces the operating efficiency of the monitoring system, and provides a standard measurement unit for the remote online monitoring system of electric energy metering that adopts the secondary loop measurement method and has measurement error detection and calculation to greatly improve the measurement accuracy of the system

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