Power frequency zero-crossing counting time mark verification device and method based on network synchronous clock

Abstract

The invention discloses a power frequency zero-crossing counting time mark verification device and method based on a network synchronous clock, and belongs to the technical field of electric power communication and measurement. The device comprises a power frequency zero-crossing signal source; a zero-crossing voltage driving circuit; a zero cross detection circuit; a communication signal separation circuit; a communication interception circuit; a counting and latch circuit; and a control and calculation circuit. Based on a beacon message and a power frequency zero-crossing counting time mark message sent by a network central node device, the measurement of a power frequency zero-crossing counting time mark error of a measured device is completed, and the calibration of the measurement precision can be carried out in each step of measurement.

Description

technical field [0001] The present invention relates to the technical field of electric power communication and measurement, and more specifically, relates to a power frequency zero-cross counting time scale verification device and method based on a network synchronous clock. Background technique [0002] At present, high-speed carrier communication technology is widely used in local communication in the field of low-voltage power consumption information collection. The network synchronization clock established by using the 25MHz clock as the frequency in the beacon, counting by 1, and 32-bit unsigned counting value can be applied to Accurate measurement of the zero-crossing phase difference of power frequency voltage between different node positions in a low-voltage station area. [0003] The zero-crossing phase difference parameter, together with the characteristic parameters such as voltage effective value, signal-to-noise ratio, power frequency cycle, etc., can be used t...

AI Technical Summary

Problems solved by technology

However, due to different manufacturers, or different schemes of the same manufacturer, the setting and processing of the network synchronization clock are different, the time stamping time of the received message is different, the zero-crossing judgment circuit is different, the trigger mechanism for locking the count value of the network synchronization clock is different, and the recording of the power frequency zero-crossing count is different. The software processing methods of time stamping are different. The above factors cause different time delays in the time stamping results of power frequency zero-crossing counts recorded by network center nodes of different manufacturers and different schemes.

If these delays are not calibrated and measured in unison, the network sub-nodes will not be able to compare the power frequency zero-crossing counting time scale data of the network center nodes of two different manufacturers and different schemes, and the station area identification will not be possible

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