Resumo:
The protection philosophy of the electric power system has been under great changes due
to the evolution of numeric relays, the IEC61850 standard and the arrival of the digital
substation (or 4.0) concept. Along with those changes, it also presents the dilemma of
evolving without losing dependability on the traditional protection schemes and exploiting
the ever-closer inherent benefits of technology. This dissertation work proposes the
definition of the methodology to be followed and the implementation of GOOSE messages
in protection schemes and substation control based on the IEC 61850 norm.
The methodology is presented following the considerations of the IEC 61850 norm and
the internal engineering definitions of a large company in Itabira/MG, which has more
than 10 years of experience in the application of the GOOSE protocol to protection and
control. The work analysis of the configuration software of six models of protection relays
from three big IED manufacturers is performed in order to ensure a broader understanding
about the specificities of each device. A network traffic analysis software is employed to
validate the benefits of the proposed method. Features for GOOSE communication tests
and remote monitoring of the integrity of the communication via supervisory system on
the protection scheme are presented. To certify and validate the correct performance of the GOOSE messages exchanged between the IEDs following the presented methodology, tests based on the chapter 10 of the norm are proposed and executed for four distinct scenarios. A thousand tests are performed to each scenario adding up to four thousand tests to each IED and twenty-eight
thousand tests to the seven IEDs group evaluated. The GOOSE message following the manufacturer’s default is compared with the GOOSE message according to the work methodology, clearly showing the advantages of the proposal, especially during troubleshooting at a substation. The methodology used in the definition of parameters and the proposal for testing and monitoring in the supervisory
system of the integrity of GOOSE messages are new items that bring greater reliability to
the protection and control system. It is noteworthy that the bench tests and the analysis
of the results proved the good performance of the equipment for the tested scenarios.
