On-line monitoring and evaluating system and method for digital electric energy meter

Abstract

The invention provides an on-line monitoring and evaluating system and method for a digital electric energy meter, and belongs to the technical field of electric energy measurement and test. The on-line monitoring and evaluating system comprises a merging unit, a switcher, an RS485 concentrator, a far-end computer, a data transmission unit and a local computer. The digital electric energy meter in actual running is monitored on line for a long time, sensitive factors affecting measurement errors and reliability of the event recording function of the digital electric energy meter are found out, a state evaluation model of a digital electric energy measurement system is set up, and application of new electric energy measurement devices such as an electronic mutual inductor and the digital electric energy meter to the digital substation electric energy measurement system is promoted.

Description

technical field [0001] The invention belongs to the technical field of electric energy metering and testing, and more specifically relates to an online monitoring and evaluation system and method for a digital electric energy meter. Background technique [0002] With the advancement of the digitalization of the power system, the digital metering system has been more and more widely used. As an important part of the digital metering system, the demand for digital energy meters is also increasing. The input signal of the digital energy meter is collected by the electronic current and voltage transformer and transmitted to the merging unit, which is a full digital signal conforming to the IEC61850-9-1 or IEC61850-9-2 communication protocol. Digital watt-hour meters perform logical operations on the input current and voltage digital signals, and theoretically there is no error in the measurement of active energy. But in fact, due to factors such as sampling accuracy, processor...

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Problems solved by technology

[0003] The national standards and verification regulations for digital energy meters have not yet been published, and the existing research is all about on-site calibration of digital energy meters, and there is no mention of long-term, online real-time monitoring and evaluation of the working status of digital energy meters , for example, the online calibration method and equipment for digital energy meters mentioned in the patent "On-line Calibration Device for Digital Energy Meter" with application number 201210545604.5

And the current research is mainly aimed at the measurement error detection of digital electric energy meters. The method of on-site testing can also simulate abnormal states such as message frame loss and network storms, and detect creep, start-up and harmonic influence of the digital energy meter, but does not pay attention to the abnormal event recording function of the digital energy meter

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