ABB Relion 620 Series, Руководство по применению

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Section 3
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RER620 application
44 RER620
Application Manual
3.3.2 Functional diagrams for control and autoreclosing
The loop control module (LCM) enables the RER620 to perform automatic loop
restoration functions, commonly accepted as a means to significantly improve circuit
reliability and to provide more effective system operation. The LCM is designed to
implement a loop control scheme by providing switching operations of the recloser to
sectionalize or remove the faulted section from the distribution system. The LCM enables
a recloser to monitor up to two banks of three-phase voltages and to consider them in
controlling breaker operations.
A recloser loop control scheme typically utilizes a predetermined number of RER620
controlled reclosers installed in series between two substation feeder circuits. This
provides isolation of any faulted section within a given distribution circuit while
simultaneously re-establishing service to all customers unaffected by the faulted section
within a relatively short period. Loop control schemes are typically located at or near key
customers at various locations throughout the distribution system, or where reliability on
particular circuits is particularly poor.