The role of a re-closer in a distribution network has developed in line with the increasing need for operators to minimize outage duration and the numbers of customers affected by faults, which in turn helps maximize performance according to reliability indices like CAIDI/SAIDI. As a result, it has two main functions. Its primary function is to clear the fault when it occurs as quickly as possible. Secondly, if the fault is permanent, the re-closer takes on a sectionalising role driven by logic or commands. These control systems are dependent on the data delivered by the re-closer on three levels: general monitoring from a historic perspective, fault data at the time of fault and pre/post fault data.
The Multilin R650 offers a complete range of standard and advanced protection elements with multiple stages and wide setting ranges. The recloser controller provides comprehensive directional and non-directional overcurrent protection, along with optional single phase tripping and reclosing to limit system impact and improve reliability. A synchronism check function ensures that the voltages are within safe limits before allowing manual closing and auto reclose operations. Additionally, voltage and frequency protection elements may be used to disconnect generation connected to the feeder. The R650 includes six voltage inputs to monitor voltages on both sides of the recloser thereby delivering a safer level of performance.
Driving Electronics Module
At the heart of the R650 design is the driving electronics module that accurately matches the requirements of the recloser device with the controller outputs. This module ensures minimum delay between the R650 output signals and the breaker operation. Through intelligent design, this reliable performance is achieved utilizing minimal power, providing operators with true multiple shot capability.
The driving electronics module design has been extensively tested and validated to ensure optimum performance and facilitate high-speed, multi-shot capability. Test results indicate that the module enables the trip capacitors to maintain sufficient charge voltage to perform 4 cycles of close and trip fast.
The EnerVista™ Suite is an industry-leading set of software programs that simplifies every aspect of using the R650. The EnerVista suite provides all the tools to monitor the status of the recloser, maintain the controller, and integrate information measured by the R650 into DCS or SCADA monitoring systems.