ABB GridShield 3P, Инструкция по установке, эксплуатации и обслуживанию, Страница: 14 / 40

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G R I DS H I E LD
®
3 P/3 S P R ECLOS E R
The molded pole assembly is connected to the
magnetic actuator assembly using four hex posts.
The magnetic actuator contains a highly powerful
permanent magnet assembly that keeps the
interrupter closed, even without current in the
actuator coil.
For 24-pin recloser variants, the actuator operates
at 250 V DC, while for the 32-/42-pin variants,
it operates at 155 V DC.
The armature has two stainless steel guide rods.
The upper guide rod, also known as the adjusting
rod, is connected to the lower end of the main
operating rod or pushrod. The pushrod directly
links to the moving contact of the vacuum
interrupter. The lower guide rod, referred to as the
actuator shaft, holds the opening spring, armature
and indicator assembly. When the actuator shaft
moves, it toggles two microswitches that indicate
the recloser status and the status of the yellow
handle to the control cabinet.
It is not recommended to disassemble the
magnetic actuator. Lubrication or maintenance
is unnecessary and will void the warranty.
If the actuator fails to operate, please contact
ABB for service.
4.4 Control
4.4.1 Low voltage control cabinet
A separate weatherproof relay-agnostic control
cabinet houses the low voltage control
components. A hinged panel allows front and rear
access to the control components. Other devices
can be mounted on the sidewalls of the cabinet.
Connections to the recloser are made through
a shielded 24-/32-/42-pin cable. The hinged door
has provisions for a padlock shackle.
For power, communication and control inputs
to the control cabinet, the floor is equipped with
removable access plate and two knockout holes.
A knockout is also provided for a radio antenna
connection. The enclosure also has provisions for
mounting a radio, modem or other user equipment.
Contact your ABB representative for more
information.
The controls operate with 24 V DC and are
connected to two 12 V DC batteries for backup.
The batteries should be checked periodically and
replaced every three to five years. This assumes
an average ambient of 77
o F (25 o C). Note that the
batteries could take up to 48 hours to fully charge
after initial power up.
Depending on the configuration, the enclosure
contains up to two large actuator-assist capacitors.
They store the energy necessary to ensure proper
operation of the magnetic actuator under all
operating conditions. They also decouple any
dependency on opening and closing due to poor
battery condition (e.g., low charge, high
impedance/shorted cell, missing battery, etc.).
The recloser control comes with a capacitor
discharge switch on the front panel to discharge
the capacitors and remove high voltage before
working inside the control cabinet.
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