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A system and method for testing synchronization characteristics of synchronous passive optical networks

A technology with passive optical network and synchronization characteristics, which is applied in the field of passive optical network and can solve the problem of inability to perform synchronization test.

Active Publication Date: 2019-10-22
YUNNAN POWER GRID CO LTD KUNMING POWER SUPPLY BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a system and method for testing the synchronous characteristics of a synchronous passive optical network, to solve the actual engineering implementation process of systems such as multi-terminal line differential protection, bus differential protection, and distribution network differential protection that use EPON networks as communication networks Unable to perform synchronization test problem in

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  • A system and method for testing synchronization characteristics of synchronous passive optical networks
  • A system and method for testing synchronization characteristics of synchronous passive optical networks
  • A system and method for testing synchronization characteristics of synchronous passive optical networks

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Experimental program
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Embodiment 1

[0029] Such as figure 1 A system for testing the synchronous characteristics of a synchronous passive optical network as shown is characterized in that: it includes a fault recording and network message analysis device 1, a merge unit tester 2 and an EPON system, and the EPON system includes an EPON master OLT terminal 3, EPON passive optical splitter 4, several EPON terminal ONU units 5 and several analog acquisition units 6, each EPON terminal ONU unit 5 is connected to an analog acquisition unit, all analog acquisition units are connected to the merging unit tester 2, all EPON Terminal ONU unit 5 is connected to EPON passive optical splitter 4, EPON passive optical splitter 4 is connected to EPON main-end OLT terminal 3, EPON main-end OLT terminal 3 is connected to merging unit tester 2, merging unit tester 2 and EPON main-end OLT The terminals 3 are all connected to the device 1 for fault recording and network message analysis.

[0030] The model of the fault recording an...

Embodiment 2

[0034] The test method matched with the system for testing the synchronization characteristics of the synchronous passive optical network described in the first embodiment is implemented on the basis of implementing the system for testing the synchronization characteristics of the synchronous passive optical network described in the first embodiment, including the following step:

[0035] Step 1: The IEC61850-9-2 message generated by the merging unit tester 2 is used as the test reference message, and the merging unit tester 2 sends the test reference message to the fault recording and network message analysis device 1;

[0036] Step 2: The EPON system is the passive unit, and the IEC61850-9-2 message generated by the EPON master OLT terminal 3 is used as the test message, and the EPON master OLT terminal 3 sends the test message to the fault recorder and network message analysis device 1;

[0037] Step 3: The merging unit tester 2 provides a reference analog quantity for all...

Embodiment 3

[0045] Such as figure 2 As shown, when the synchronization test in the EPON system does not depend on the external synchronous clock, disconnect the external second pulse provided by the merging unit tester for the OLT terminal at the EPON main end, and all the analog acquisition units will collect the voltage phase data and The current phase data is sent to the EPON master OLT terminal through the EPON network, and the EPON master OLT terminal processes all the received voltage phase data and the current phase data into IEC61850-9-2 messages and uploads them to fault recording and network messages Analysis device; fault recording and network message analysis device compares the sampling value phase waveform information between the IEC61850-9-2 messages uploaded by each analog acquisition unit: where 101 voltage A, 101 voltage B and 101 voltage C are arbitrary The A-phase voltage, B-phase voltage and C-phase voltage collected by one analog acquisition unit, the corresponding ...

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Abstract

The invention discloses a system and method for testing the synchronization feature of a synchronous passive optical network, and belongs to the technical field of passive optical network. The system comprises a fault wave recording and network message analyzing device, a merging unit tester and an EPON system. The system and method can be used to the problem that the synchronization performance of systems of multi-end line differential protection, bus differential protection and distribution network differential protection cannot be tested in practical engineering process when the EPON serves as the communication network.

Description

technical field [0001] The invention belongs to the technical field of passive optical network. Background technique [0002] In a digital substation based on the IEC 61850 standard, analog quantities such as current and voltage are sampled by the acquisition device at equal intervals, and are transmitted to the corresponding protection and control devices in real time in the form of sampled value (SMV) messages at equal intervals. In order to realize bus differential or transformer differential protection across bays, synchronous sampling is required between the terminals of each bay. The commonly used synchronization methods include 1-PPS second pulse, IRIG-B code, and IEEE 1588 precise time protocol. [0003] For 1-PPS second pulse or IRIG-B code, it needs to rely on external GPS or Beidou and other clock synchronization systems. Since clock synchronization systems such as GPS or Beidou need to receive satellite signals, their reliability depends on links such as satelli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q11/00H04B10/077
Inventor 吉德志徐佳王致陈益徐宇陈铭李昆华李勇杨鹏杰余章和翔宇孙西欧阳劲松甘龙唐强李芳洲王若丞宋庆林李国斌蒋正杰卢兰静杨柳马永莲李磊李卫周瀛曹俊峰张南辉张国武袁鸿斌潘卫东郎妙文李钢宋庆文立潘巍阎定强李明钢蒋羽鹏田彪李寿银李辉
Owner YUNNAN POWER GRID CO LTD KUNMING POWER SUPPLY BUREAU