Digitalized electric energy metering system

Abstract

The digitalized electronic meter system with each voltage current mutual-inductor output connect with the corresponding electronic meter module and linking with the input end of the electro-optical conversion module, whose output links an optical fiber, all of which are combined and through an optical cable connected with the electro-optical conversion and signal treatment module, with the electro-optical and signal treatment module converting the optical signal into the digital electro signal, and its output end connects with the digitalized centralized electro-optical meter system. The optical cable replaces the electric cable as the secondary signal transmission circuit, realizes the digitalized accuracy meter of the high pressure electric energy, effectively solves the current complex error big difficulty, greatly simplifies the secondary signal transmission circuit and greatly alleviates the on-site construction working load.

Description

technical field [0001] The invention belongs to the field of electric energy metering, in particular to a digital electric energy metering system. Background technique [0002] In the existing electric energy metering system, the voltage transformer is generally far away from the metering device in the control room, so the secondary connecting wire is relatively long (for some 500kV substations, up to 800m), and there are For fast switch contacts and fuses with large resistance values, if the load current is large, the secondary circuit voltage drop caused by it will be relatively large, so the measurement error caused by the voltage drop of the secondary wire of the voltage transformer is included in the integrated energy measurement. Errors often account for the largest proportion. The comprehensive error of electric energy measurement also includes the composite error of the voltage transformer, the composite error of the current transformer and the error of the electric...

AI Technical Summary

Problems solved by technology

These errors lead to inaccurate energy metering and often lead to disputes between suppliers and consumers

In addition, the secondary circuit of the existing metering device requires a large number of cables, resulting in heavy construction workload, high cost, poor anti-electromagnetic interference, small amount of transmitted information, and complex structure of the secondary circuit when there are multiple circuits

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