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OVR-15, 27 & 38 LV cabinet Instruction Manual
4.2.6
SERVICE and DISCHARGE modes
A two position (Service & Discharge) selector switch is provided in the LV cabinet. For normal situations
when the recloser is in service, this switch should be in Service position. In case, any maintenance is to be
conducted inside the LV cabinet, the switch should be moved to Discharge position to ensure operator’s
safety from charged capacitors.
SERVICE Mode:
For normal operation of recloser; the selector switch must be put in service mode. All the
MCBs are in ON condition and the capacitors are kept fully charged by the ACM.
DISCHARGE Mode:
Since the LV cabinet houses charged capacitors, it is mandatory that the operator
should properly discharge them before conducting any maintenance inside the LV cabinet. For safely
discharging the capacitors, a capacitor discharge circuit is provided in the LV cabinet.
The operator has to put the selector switch into Discharge mode upon which, the capacitors get
connected to the discharge circuit. In Discharge mode, the capacitors are no more charged.
A red LED is provided on the discharge circuit to indicate the process of capacitor discharge. It takes few
minutes for the capacitors to get safely discharged. This red LED starts glowing as soon as the switch is
put in discharge mode and continues to glow until the capacitors are discharged to a safe level (around
2V).
Operator should wait until this red LED indication is turned OFF before touching any component inside
the LV cabinet. In discharge mode protection & control are not available for the recloser.
4.2.7
External Auxiliary Supply Status monitoring
In the event of loss of external auxiliary supply, the Intelligent battery Charger sends signal to RER615
relay over an independent binary input. Thus, the status of availability of external auxiliary power to the
LV unit can be monitored remotely in case communication set-up is made available.
4.2.8
RER615 control
OVR-15, 27 & 38 recloser LV cabinet is supplied with the microprocessor-based RER615 Intelligent
Electronic Device (IED) from ABB’s Relion family. This technologically advanced relay integrates all
traditional recloser control functions with new advanced functions, such as three phase inrush and
programming
fl
exibility, providing a wide range of metering and remote control options.
For details on relay programming, operations, and testing, refer to technical documentation at
www.abb.com. For details on the overall control circuit, refer to the approved/as built wiring diagram
supplied with the recloser.
The RER615 implements a draw out case design for easy removal and internal upgrades. This design has
two main parts: the frame and the case. The frame is
fi
xed on the inner swing door of the LV cabinet. The
case is removable via a handle and houses various cards. All card connections are made with terminal
blocks that are af
fi
xed to the frame of the IED. This is powered by the charging device.
