Intelligent substation merging unit absolute delay test device

Abstract

The invention discloses an intelligent substation merging unit absolute delay test device. An output message of a merging unit generates a new delay after passing through a switch and other network hardware devices. Since delays caused by different transmission networks are not uniform, the merging unit cannot determine the new delays, and the new delays cannot be counted into rated delays. The device provided by the invention comprises an optical network port, an Ethernet PHY chip, a field programmable logic gate array FPGA, a synchronization module and a human machine interface. The opticalnetwork port and the Ethernet PHY chip are in one-way communication. The Ethernet PHY chip and the field programmable logic gate array FPGA are in one-way communication. The field programmable logic gate array FPGA and the synchronization module are in two-way communication. The field programmable logic gate array FPGA and the human machine interface are in two-way communication. According to theinvention, the absolute delay of the merging unit is accurately tested, and a technical support is provided for asynchronous error checking of an electronic transformer.

Description

technical field [0001] The invention relates to the field of digital metering of smart substations, in particular to a test device for the metering errors of merging units of core equipment of smart substations. Background technique [0002] At present, the secondary quantity access of the smart substation has been changed from the previous analog quantity connection to the digital quantity connection after optical fiber. The secondary voltage and current acquisition methods of smart substations mainly include the following types. [0003] 1. Electronic transformer plus merging unit method [0004] The collector of the electronic transformer is generally installed outdoors. The built-in sampling circuit of the collector directly converts the primary voltage and current into digital quantities, and sends them to the merging unit (MU) through optical fibers. The multi-channel digital signal of the multi-phase collector is sent to the MU, and the MU synchronizes and merges th...

AI Technical Summary

Problems solved by technology

[0005] 2. Traditional electromagnetic transformer plus merging unit method

These delays are included in the rated delay information of the merging unit, but new delays will be generated after the MU output messages pass through network hardware devices such as switches. Due to the inconsistency of delays caused in different transmission networks, the merging unit These new delays cannot be determined and therefore cannot be factored into the rated delay

These new delays will affect the calibration of secondary equipment such as calibrator

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