Banca de QUALIFICAÇÃO: EGBERTO DE ARRUDA MOREIRA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : EGBERTO DE ARRUDA MOREIRA
DATA : 06/07/2018
HORA: 08:00
LOCAL: Sala I2 do Setor de Aulas 4
TÍTULO:

Application of Hybrid Reclosers in Electricity Distributions Networks

PALAVRAS-CHAVES:

Automatic Recomposition; Coordination; Feeder; Recloser; Sectionalising Switch.

PÁGINAS: 15
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Elétrica
SUBÁREA: Sistemas Elétricos de Potência
ESPECIALIDADE: Medição, Controle, Correção e Proteção de Sistemas Elétricos de Potência
RESUMO:

The need to maintain the quality indicators of electricity supply, DEC (Equivalent Duration of Interruption per Consumer Unit) and FEC (Equivalent Frequency of Interruption per Consumer Unit), both required by ANEEL (National Agency for Electric Energy) has never been so imperative for the concessionaires of electric energy. Year after year these indicators become increasingly demanding. Moreover, in a natural way, the electrical system only tends to grow and become more complex, consequently bringing more technical challenges to the Protection, Operation and Maintenance (O & M) areas of Distribution Networks. A Distribution Network, also known as a feeder, when it is small, densely charged and with a high level of short-circuit current in the substation bus (SE), becomes an example of a challenging condition to ensure coordination and selectivity between the circuit protection devices. This scenario is especially difficult for protection when there is a consumer of group A connected at the end or near the end of this type of feeder. With the significant investments made in recent years by electric power utilities for the acquisition and installation of reclosers (RL) in the RDs, in practice, the number of reclosers operating as a sectionalising switch (SECC) has also grown, not as a recloser or even a circuit breaker. This "sacrifice" occurs mainly in cases where there is no coordination for short-circuit currents between phases (ANSI functions 50/51), since for earth faults it can be assumed that there will always be coordination (ANSI 50N / 51N functions ). This solution is satisfactory for simple configurations of the RL-SECC type, however, it has major drawbacks when it involves two or more consecutive (or serial) SECCs in the feeder. Considering this scenario and the sophistication of the current protection relays used in the control cubicles of the reclosers, this paper proposes a solution to the coordination and selectivity problem by making use of the logic programming resources in the relays, transforming the recloser into a hybrid device. This way, it operates as RL or SECC depending on the type of short circuit. The hybrid recloser, in addition to operating as a dual behavior device (RL / SECC), optimizing the use of this active in the network, does not require any change in the device protection (recloser or breaker) adjustment upstream, nor does it depend on Communication. In addition, it allows the automatic recomposition of healthy networks, in line with safety practices (it does not increase the number of reclosing of the upstream devices, it can be activated and deactivated locally or remotely, etc.), besides being a oriented to a specific recloser manufacturer. It is hoped, with this work, to bring a new perspective to the area of study of protection of electric power distributors and significant contribution with new practices of protection adjustments and the operation of reclosers in RDs.

MEMBROS DA BANCA:
Presidente - 1637588 - ARRHENIUS VINICIUS DA COSTA OLIVEIRA
Interno - 347428 - MARCOS ANTONIO DIAS DE ALMEIDA
Interno - 1045672 - MAX CHIANCA PIMENTEL FILHO