Entec EVR, Руководство пользователя

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EVR AUTOMATIC RECLOSER http://www.entecene.co.kr
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3. CONSTRUCTION
The Recloser can be mounted on an outdoor pole by assembling a mounting bracket connected to
the top of main tank and also installed at substation with substation mounting frame. The vacuum
interrupter, magnetic actuator, and current transformer (CT) are contained in the TIG-welded main
tank and filled with SF6 gas for the insulation of recloser main tank.
The interruption of Recloser is performed by the vacuum interrupter and SF6 gas is used to insulate.
The recloser filled with SF6 gas does not produce any by-products by arc during interruption. Thus
it maintains permanent insulation capability and prevent corrosion of the main tank components.
The Recloser interrupter arranged with the 3-phase dielectric mold frame, consists of the vacuum
interrupter and the trip spring with the same distance. The driving arm connected at the end of
moving contact transfers a driving force of the magnetic actuator to the interrupter for close and
open operation.
The 6 bushings on the top of main tank can be supplied with porcelain, polymeric(E.P.D.M. rubber
or silicone rubber) bushing upon to user's request. The current transformer (CT) is installed at the
bushing connected at the fixed contact of interrupter in the main tank, and CT can monitor phase
fault currents, earth fault currents and load currents, and send signals to the control electronics.
If the control cable of CT is disconnected at both end, the CT is automatically shorted by the
automatic CT protection circuit.
The manual Trip/Locking device is positioned on the front side of main tank. The indicator points
an interrupter's open/close status and the operation counter are located at the bottom of main tank.
The Recloser operation sequence is performed by the microprocessor-based relay. The relay is
installed in the control cubicle protected by rain-proof case. The Recloser immediately performs a
preset operation sequence to re-close when a phase/ground fault current is higher than the preset
value.
If a fault current is not cleared at the end of full protection sequence, the Recloser will be lockout
as tripped, and remains until the next close operation. If a fault current is cleared during the
protection sequence, the Recloser is closed, and then returns into sleep mode after the reset time.