Ground Fault Protection Ships and Offshore Platforms - Bender.org
Ground Fault Protection Ships and Offshore Platforms - Bender.org
Ground Fault Protection Ships and Offshore Platforms - Bender.org
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2<br />
Insulation Monitoring on Ungrounded Systems<br />
Ungrounded systems onboard ships <strong>and</strong> offshore platforms are continuously monitored<br />
by a BENDER ground detector. Connected between the active conductors <strong>and</strong><br />
ground (the hull), the detector superimposes a small measuring voltage onto the<br />
system. If a ground fault occurs, the measuring circuit is closed <strong>and</strong> a small measauring<br />
current will flow. The measuring current is proportional to the insulation resistance<br />
(the magnitude of the ground fault), <strong>and</strong> is evaluated by the detector.<br />
BENDER ground detectors employ the latest in detection technology, including the following:<br />
DC measuring voltage<br />
A frequently used measuring principle is<br />
the superimposition of a DC measuring<br />
voltage between the system <strong>and</strong> ground.<br />
This is the st<strong>and</strong>ard measuring principle for<br />
pure AC ungrounded systems, both single-<br />
<strong>and</strong> three-phase.<br />
Approvals<br />
Llyod’s Register<br />
of Shipping<br />
Underwriters<br />
Laboratories Inc.<br />
AMP measuring principle<br />
BENDER's AMP measuring principle overcomes<br />
the limitations of DC measuring<br />
signals by superimposing a clocked, pulsed<br />
measuring voltage onto the system. The<br />
signal is microprocessor controlled to<br />
automatically adapt itself to prevailing<br />
system conditions, such as high leakage<br />
capacitances. This signal is ideal for toda'ys<br />
modern power distribution systems that<br />
include: Pure DC systems, systems with a<br />
mix of AC <strong>and</strong> DC (including rectifiers), <strong>and</strong><br />
systems with variable frequency drives<br />
(VFDs).<br />
Type<br />
Fields of application<br />
Insulation monitoring<br />
Coupled systems / systems connected via tiebreaker<br />
Ungrounded systems with rectifiers / variable frequency drives<br />
Compatible with BENDER's ground fault location system<br />
System nominal voltage<br />
System frequency range<br />
Response values/contacts<br />
Number of response values<br />
Response values<br />
Contact, main alarm<br />
Contac, prewarning<br />
Contact, other<br />
Communication<br />
LCD display<br />
Pre-alarm display<br />
RS-485 interface<br />
Real time clock<br />
General features<br />
Measuring principle<br />
Capability to latch alarm<br />
Selective fault location L+/L-<br />
Connection monitoring<br />
Detailed history memory<br />
St<strong>and</strong>by capability<br />
<strong>Ground</strong> fault location<br />
Nominal voltage IRDH575B1-…<br />
Nominal voltage IRDH575B2-…<br />
Frequency range<br />
Evaluators<br />
Compatible current transformers<br />
Approvals
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