GE Industrial Solutions GERAPID 2508, 4008, 5008, 6008 WITH ARC CHUTE 1X2 - Manual (Page 57)

2011-03-14 S47183De rev.01 Design and specifications are subject to change without notice 57
7.3 Glossary
A
a-release – see Shunt trip device;
Activating magnet – see Closing drive;
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 runners – (also: arc probes; arc horns). Directs arcs from
contacts into the arc chute. There are two arc runners
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.
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.
Auxiliary switch – (also: auxiliary switch; make/break contact;
a-/b-contact). A s witch 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.
C
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.
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.
E
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.
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.
M
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.
Main terminals – (also: main connections). Two conductive
bars provided for electrical connection to external main
circuit. Different configurations are avaiable.
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.
O
OCT – see Over-Current release;
Opening operation – (also: switching OFF; OPEN operation).
An operation by which the breaker is brought from the
CLOSED position to the open position.
Over-Current release – (also: OCT). An instantaneous and
direct acting mechanical release. Tripping the breaker in case
of overloads and short circuits. Is adjustable within
predetermined range. Opening time depends on short circuit
conditions and shall not exceed 5ms. OCT is activated be
means of magnetic energy from main circuit. Requires no
external control power.
P
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.
CLOSED position is marked as “I”, or RED flag.
OPEN position is marked as “O”.
Pre-contact – see Arcing contact;
R
r-release – see Zero voltage release;
S
SEL – Current measurement system, consisting of sensing
element and control circuit. The sensor is an insulated tube,
mounted on the top terminal of the breaker. Utilizes two Hall’s
probes for sensing the current and direction. The proportional
voltage signal is transmitted to control circuit, placed in
control box. The SEL control PCB is an opto-isolated
transducer, which generates standard output signals
proportional to measured current.
SEL control PCB – a control circuit PCB. Controls and
transforms current measurement signal from SEL sensor.
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.
Shunt trip release – (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.
Solenoid drive - see Closing drive;
ST control PCB – control circuit PCB supervising the operation
of shunt trip release.
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.
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.
U
UVR control PCB - control circuit, designed as a single PCB,
for supervising the zero-voltage release device.
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 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.