GE Industrial Solutions GERAPID 8007R, 10007R WITH ARC CHUTES 1X2, 1X3 - Manual (Page 37)

O
7.3 Glossary Opening operation – (also: switching OFF; OPEN operation).
An operation by which the breaker is brought from the
CLOSED
A
a-release – see Shunt trip device;
P
Activating magnet – see Closing drive;
POCT – An instantaneous, polarized and direct acting
mechanical release. Tripping the breaker in case of fault
backward currents, starting from 400A threshold. It is
adjustable within predetermined ranges. Opening time
depends on short circuit conditions and shall not exceed 7ms.
POCT is activated be means of magnetic energy from main
circuit. Requires no external control power.
Anti-pumping device – see SU control PCB. Prevents
reclosing after a close-open operation, as long as the device
initiating closing is maintained in the position for closing
Arc probes – (also: arc runners; arc horns). Provide safe arc
leading into the arc chute. There are two arc probes mounted
in Gerapid breaker, front and back.
Arcing contact – – (also: pre-contact; arcing pre-contact). An
arcing contact on which the arc is intended to be established,
to avoid wearing and burning of the main contacts. It is
mounted at the top of flexible band. It is easy to replace.
Spring loaded to maintain proper contact force.
Polarized breaker – is a breaker, which trips only in case of
specific direction of a current flow, by means of POCT release.
The breaker’s main connections are marked with plus and
minus. These marks show normal current flow, at which the
breaker does not trip.
Auxiliary contact – (also: make/break contact; a-/b-contact,
changeover contact, convertible contact). A contact included
in an auxiliary circuit and mechanically operated by the
breaker.
Position indicator – (also: position indicating device). A
mechanical device mounted at the front of closing drive.
Indicates whether the breaker is in the open or closed
position.
Auxiliary switch – (also: auxiliary switch; make/break contact;
a-/b-contact). A switch block containing up to 10 auxiliary
contacts,. Mechanically operated by the mechanism of the
breaker during switching operations. Auxiliary switch block is
mounted in lower compartment of the control box. Every
contact can be either NO or NC, configured by appropriate
wiring.
CLOSED position is marked as “I”.
OPEN position is marked as “O”.
Pre-contact – see Arcing contact;
R
r-release – see Zero voltage release;
S
C Self cut-off function– A safety feature provided to avoid
overstressing of the closing drive and shunt trip release.
Closing drive is automatically cut-off from power source after
500ms. Shunt trip coil is connected in series with auxiliary
contact(s), which cause cut-off after breaker’s opening.
Closing drive – (also: activating magnet; closing solenoid;
solenoid drive). High power, black solenoid coil, mounted at
the front of the breaker, below the control box. Use for
electric and remote closing of the main contacts. Power
consumption is up to 2.6kW. Closing time is ~150ms. Shunt trip – (also: ST; shunt release; a-release). Instantaneous
release energized by means of voltage signal. Within 50ms
trips the breaker’s mechanism. Use for remote OPEN
operation. ST can be activated by potential free contact or by
directly applied voltage from external source. ST can have a
single or double winding.
Closing operation – (also: switching ON; CLOSE operation). It
is operation, by which the breaker is brought from the OPEN
position to the CLOSED position.
Closing solenoid - see Closing drive;
Control circuit terminals – (also: control sockets/plugs). Fully
insulated sockets at the front cover of control box. Intended
for external connection to the auxiliary and control circuits. Solenoid drive - see Closing drive;
ST control PCB – control circuit PCB supervising the operation
of shunt trip release. E
SU control PCB – control circuit PCB supervising the remote
closing operation by means of solenoid drive. Presents in
every breaker, and placed in control box. Provides also anti-
pumping and self cut-off functions.
ED coil – (also: electro-dynamic coil). An impulse coil release.
Actuating element of ED impulse release, mounted on the
base, under the mechanism.
Electro-Dynamic impulse release – (also: ED tripping;
impulse release). Release device, consist of actuator (ED coil)
and control circuit (NEKO PCB with C-bank). This is an
auxiliary release, activated by high-energy impulse of
current. The impulse is shaped by internal (NEKO) or external
C-bank. Opening time is less 3ms. Time to charge capacitors
is ~15sec.
Switching ON – see Closing operation;
Switching OFF – see Opening operation;
T
Trip-free device – A mechanical switching device, the moving
contacts of which return to and remain in the open position
when the opening operation is initiated after the initiation of
the closing operation, even if the closing command is
maintained. To ensure proper breaking of the current, which
may have been established, it may be necessary that the
contacts momentarily reach the closed position.
H
Lever for manual operating – (also: hand lever). Hand lever
can be used for both, closing and opening manual operation.
It is intend for use only during maintenance.
U
M
UVR control PCB - control circuit, designed as a single PCB,
for supervising the zero-voltage release device.
Main circuit – (also: mains; primary circuit; current path). All
the conductive parts of the breaker included in the circuit,
which is intend to close or open. It consists of: main terminals
(upper and lower), fixed contact, flexible band and lower bus
bar.
Z
Zero-voltage release – (also: under-voltage; UVR; r-release).
An auxiliary tripping device. Trips the breaker open on control
voltage loss. Opening time is less than 75ms. It is used for
remote OPEN operation or control voltage supervision.
Interchangeable option with shunt trip release. Activated by
means of auxiliary “potential free”, NO or NC contact.
Main terminals – (also: main connections). Two conductive
bars provided for electrical connection to external main
circuit. Different configurations are available.
N
NEKO control PCB – (also: ED coil control unit; internal C-bank
control). Control circuit PCB to supervise the operation of the
ED coil. It consists of control circuit and bank of capacitors.
Required to energize the ED impulse coil.
2010-02-16 DTR01807 rev.02 Design and specifications are subject to change without notice 37