High Speed DC Circuit Breaker - G E Power Controls

2.2 Installation
2.2.1 Operational environment
• The breaker, as delivered, is IP00 protected. It is intended
to work in indoor applications, without pollutions, with
non-conductive dust, protected against high humidity
and condensation. Low conductivity dust deposit due to
frequent condensation of humidity is acceptable. General
environmental conditions refer to EN 50123-1 - annex
B, and IEC60947, class PD3.
• The breaker can operate within ambient temperature
range of –5°C…+40°C (23...104°F). With decreased nominal
current, breaker can operate up to +60°C (140°F).
• The breaker can operate at altitude up to 2000m
(~6500ft).
• The breaker shall not be subjected to strong vibrations.
Vibrations of 0.5g per 30sec in vertical and horizontal directions
are allowed.
• Air shall be clean and its relative humidity shall be not
more than 50 % r.h. at the maximum temperature of
+40°C (104°F). Relative humidity may be higher if the
temperatures are lower, for example, 90 %r.h. at +20°C
(68°F). Slight condensation might occur during variations
of temperature
2.2.2 Installation and interfaces
• The lower and upper connections (code nr: 4) must be
connected directly to the main cables or bus bars. The
breaker must only be used in an upright operation position
with the arc chute in place and fully secured.
• After installation, both the arc chute and special
threaded joints must be checked for tightness.
• The safety distances as shown in the dimensional drawings
must be maintained to grounded or insulated parts.
Suitable measures must be taken to protect personnel
from arcs.
• Strong, external magnetic fields, caused by improperly
located supply conductors or tray fields from other devices,
can lead to a shift of the trip setting thresholds.
This may result in premature tripping, or no tripping at
al, during low-level short circuit current events. This has
to be accounted for when installing and operating the
device with shielding added if appropriate.
• The control wires must be connected to the control terminals
(code nr: 19), as shown in the schematic circuit
diagram (Page 14). The protective grounding wire must
be connected at the marked contact.
2.3 Usage
2.3.1 Supply and load
• In accordance with its type, the breaker has been designed
for the current and voltage listed in Table 1, section
3.3.
• During continuous operation, breaker must be loaded
with its rated current at maximum. Load currents in excess
of breaker nameplate rating are allowable for brief
periods. Refer to the short time currents listed in Tables
1a/1b.
• Do not exceed the rated operating voltage shown on the
breaker’s nameplate.
• The drive and the auxiliary tripping devices (code nr: 8).
shall be supply within the specified control voltage
range. The auxiliary-tripping devices must be loaded
with the values listed in Table 2a at maximum.
• Plugging or removing the auxiliary current connectors
are only allowed at zero potential, no voltage (-X2
:1/:2) (-X3 :4/:5) !
2.3.2 Adjusting the OCT
• OCT is an over-current tripping device (code nr: 7), which
trips a breaker in case of overload or short circuit. This is
fully adjustable, instantaneous and direct tripping device.
• OCT adjustment [Fig.3], within a specific range, is realized
by turning the screw 1.
• Adjusting procedure requires an SW6 hexagon wrench
2.
• The adjustment must only be carried out after the
breaker has been disconnected from the main circuit
and has been grounded.
• Turning the adjustment screw clockwise increased the
trip threshold, turning the screw counter-clockwise decreased
the tripping threshold.
• Aligning the arrow and the marking into one line 3 performs
adjustment.
S47183-e 01/2008 Design and specifications are subject to change without notice 5