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Three-phase type SDR controller
The three-phase type SDR controller is
equipped with integrated pole-mount
brackets. It can be installed on the recloser
pole or substation frame at an operating
height as preferred by the user.
The three-phase type SDR controller is
equipped with a lockable door with a three-
point latch and provision for a padlock.
Behind the door is a swing panel, which
contains the control and protection relay,
miniature circuit breakers and a ground fault
circuit interrupter (GFCI) safety outlet for a
laptop. Behind the swing panel, there are
printed circuit boards (PCB), rechargeable
batteries and wiring connections.
The three-phase type SDR controller is
equipped with a thermostat-controlled anti-
condensation heater (space heater). The
thermostat also controls the space heater in
the switch unit. Each heater consists of two
resistors. The heating is switched off above
approximately 40° C.
PCB2: Switch unit driver (SUD): controls the
magnetic actuator with monitoring of
end positions, monitoring for broken
cable and with discharge switch for the
capacitors (PCB2 not included with the
Schweitzer Engineering Laboratories,
Inc. type SEL-651R recloser control relay
option)
PCB3: Capacitors for magnetic actuator (PCB3
not included with the Schweitzer
Engineering Laboratories, Inc. type SEL-
651R recloser control relay option).
Note: The three-phase type SDR controller
requires two PCB3 capacitor circuit boards for
operation with the 38.0 kV type SDR vacuum
distribution three-phase recloser switch unit.
This option is not illustrated in this general
description.
4
1
7
8
5
6
Figure 10: Three-phase type SDR controller with door open
4
3
6
5
Figure 11: Three-phase type SDR controller with swing panel open
3
Figure 12: Space heater
1. Door
3
2. Three-phase type SDR
controller
3. Pole-mount bracket
4. Type 7SR224 control and
protection relay (illustrated
partially withdrawn)
2
9
5. Ground fault circuit
interrupter (GFCI) duplex
outlet
6. Miniature circuit breakers CB1,
CB2 and CB3
7. Close pushbutton
8. Open pushbutton
9. Swing panel
1
2
1
2
1. PCB3
2. PCB2
3. Miniature
circuit
breakers CB1,
CB2 and CB3
4. Swing panel
5. Terminal
blocks
6. Heater
thermostat
1. Space heater
2. Batteries
(four
12 Vdc,
12 AH)
3. Internal
copper
ground bar
11
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