Siemens SDR 15.5 Instruction Manual page 10

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1. Operations counter
Figure 8: Single-phase operations
counter on the bottom of the switch
unit
Triple-single frame
Single-phase frame
Figure 9: Typical pole-mounting
frames
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Operations counter
A mechanical operations counter is installed
at the bottom of each recloser switch unit. It
records the total number of switching
operations independently of the electrical
recording in the controller. The operations
counter is used to keep track of the total
number of operations of the switch unit in
case the controller is replaced or the
electronic counter is reset in the controller.
Mounting frames for recloser switch unit
A pole-mounting frame is used to install the
recloser switch unit on an overhead line pole.
The mounting frames can also optionally
accommodate surge arresters, source-side
external voltage sensors and control power
transformers. The following pole-mounting
frames are available:
Triple-single pole frame (see Figure 9:
Typical pole-mounting frames) with
optional provisions for line-side external
voltage sensors, line- and load-side surge
arresters and control power transformers.
The single-phase mounting frames may be
used for cross-arm mountings or for cluster
mountings or vertical mountings on utility
poles.
For installation within a substation, a special
mounting frame is available.
For pad-mounted applications, customized
solutions are available.
Consult frame installation drawing provided
with the order-specific drawings for
information on mounting frames.
Control and protection relays
The term type "SDR controller" refers to the
control cubicle as described by the type SDR
distribution recloser. The option for control
and protection relays are brand specific.
This instruction manual includes information
on the type SDR controller to supplement
information in the control and protection
relay instruction manuals.
The user should consult information on the
control and protection vendor's web site for
information on the specific relay involved (see
Annex A on page 38).
The type SDR triple-single controller may be
ordered with multiple control and protection
relay options. The optional relays include:
Siemens type 7SR224 recloser control relay
(standard control and protection relay
option)
Schweitzer Engineering Laboratories, Inc.
type SEL-651R recloser control relay
(includes internal power module and
capacitors which operate the swich unit
magnetic actuators; type SDR switch unit
driver electronics [PCB2] and capacitors
[PCB3] are not utilized).
Only the Siemens type 7SR224 control and
protection relay option is illustrated in this
instruction manual.