Integrated system for safe and future-proof power distribution - Moeller
Integrated system for safe and future-proof power distribution - Moeller
Integrated system for safe and future-proof power distribution - Moeller
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
<strong>Integrated</strong> <strong>system</strong> <strong>for</strong> <strong>safe</strong> <strong>and</strong><br />
<strong>future</strong>-<strong>proof</strong> <strong>power</strong> <strong>distribution</strong><br />
With <strong>power</strong> requirements increasing all over the world <strong>and</strong> the<br />
continued increasing pressure to cut costs, there is an even<br />
greater need <strong>for</strong> secure investments through which efficient<br />
planning, assembly, installation <strong>and</strong> operation are ensured. To<br />
meet these requirements, cost-efficient <strong>and</strong> st<strong>and</strong>ardised <strong>power</strong><br />
<strong>distribution</strong> <strong>system</strong>s are needed that customers can adapt to the<br />
individual requirements of their projects. In short what is needed<br />
is maximum flexibility, economy <strong>and</strong> reliability.<br />
Extensive <strong>safe</strong>ty requirements <strong>and</strong><br />
special st<strong>and</strong>ards have to be observed in<br />
the <strong>power</strong> <strong>distribution</strong> sector. The consistent<br />
use of the extensive assembly<br />
<strong>and</strong> testing regulations as stipulated by<br />
DIN EN 60439-1 (VDE 0660 Part 500):<br />
2000-08 [1, 2] is there<strong>for</strong>e an important<br />
requirement <strong>for</strong> the reliable <strong>and</strong> <strong>safe</strong><br />
operation of a switchgear <strong>and</strong> controlgear<br />
assembly, i.e. a type-tested (TTA)<br />
<strong>and</strong> partially type-tested (PTTA) assembly<br />
<strong>for</strong> <strong>power</strong> <strong>and</strong> service <strong>distribution</strong><br />
boards (DIN EN 60439-3 (VDE 0660<br />
Part 504):2002-05 [3, 4]). In compliance<br />
with DIN EN 60204-1 (VDE 0113 Part<br />
1):1998-11 [5, 6] the switchgear <strong>and</strong><br />
controlgear assembly, or switchboard<br />
<strong>system</strong> <strong>for</strong> short, can likewise be used<br />
as a type-tested/partially low-voltage<br />
Jutta Zacharias is head of the<br />
Power Distribution business unit<br />
at <strong>Moeller</strong> GmbH in Bonn.<br />
e-mail: jutta.zacharias@moeller.net<br />
Dipl.-Ing. Heinrich Moog is head of<br />
xEnergy product management at<br />
<strong>Moeller</strong> GmbH in Bonn.<br />
e-mail: heinrich.moog@moeller.net<br />
Picture 1. In the divide between the dem<strong>and</strong><br />
<strong>for</strong> greater <strong>safe</strong>ty, flexibility <strong>and</strong> load<br />
capability on the one h<strong>and</strong>, <strong>and</strong> pressure to<br />
cut costs on the other, <strong>Moeller</strong>'s switchboard<br />
<strong>system</strong> is a <strong>future</strong>-<strong>proof</strong> plat<strong>for</strong>m <strong>for</strong> resultoriented<br />
solutions<br />
control panel <strong>for</strong> machines. Apart from<br />
the basic assembly <strong>and</strong> test requirements,<br />
the relevant st<strong>and</strong>ards <strong>and</strong> regulations<br />
also lay down the <strong>safe</strong>ty requirements<br />
<strong>for</strong> electrical equipment, personnel<br />
<strong>and</strong> <strong>system</strong> protection <strong>and</strong> also the<br />
selection <strong>and</strong> dimensioning of electrical<br />
equipment.<br />
The extensive type testing <strong>for</strong> lowvoltage<br />
switchboard <strong>system</strong>s contains<br />
the following seven tests areas:<br />
• Limit overtemperature,<br />
• Dielectric strength,<br />
• Short-circuit current capability,<br />
Jutta Zacharias • Heinrich Moog<br />
• Efficiency of the protective devices,<br />
• Creepage <strong>and</strong> air clearances,<br />
• Mechanical functions,<br />
• IP protection.<br />
The following functions are tested in the<br />
switchgear <strong>and</strong> controlgear assembly in<br />
the degree of protection <strong>for</strong> the corresponding<br />
current class:<br />
• Maximum current carrying capacity<br />
of the electrical function units,<br />
• Switching <strong>and</strong> protective devices in<br />
mechanical <strong>and</strong> electrical combination<br />
with the mounting <strong>system</strong>s including<br />
the main busbars, dropper bars <strong>and</strong><br />
busbar links,<br />
• All <strong>system</strong> components as integral<br />
units in their functional mounting.<br />
An additional test is carried out in the<br />
protective conductor circuits of the <strong>system</strong><br />
panels in accordance with IEC/EN 60<br />
439-1, section 8.2.4 - Verification of the<br />
effectiveness of the protective circuit -<br />
with the following tests:<br />
• Section 8.2.4.1: Verification of the<br />
effective connection between the<br />
exposed conductive parts of the<br />
assembly <strong>and</strong> the protective circuit by<br />
measurement <strong>and</strong><br />
• Section 8.2.4.2: Verification of the<br />
short-circuit strength of the protective<br />
circuit by test.<br />
Both tests must be verified by the<br />
manufacturer (of each) <strong>and</strong> are particularly<br />
important <strong>for</strong> personnel protection.<br />
The results <strong>for</strong> the assembly of the<br />
switchboard <strong>system</strong> are documented <strong>for</strong><br />
practical application by <strong>system</strong> suppliers,<br />
such as in product catalogues;<br />
selection <strong>and</strong> dimensioning documents;<br />
assembly manuals; configuration <strong>and</strong><br />
engineering tools; certification of the<br />
completed type tests <strong>for</strong> the declarations<br />
of con<strong>for</strong>mity by the <strong>system</strong> supplier.<br />
The tests there<strong>for</strong>e guarantee reliable<br />
<strong>system</strong> assembly, as well as verifying the<br />
basic features with successfully completed<br />
type tests (TTA). At the same time,<br />
the reliable functioning of a switchboard<br />
<strong>system</strong> during operation is also<br />
verified – an important factor <strong>for</strong> a<br />
<strong>future</strong>-<strong>proof</strong> <strong>and</strong> reliable <strong>power</strong> supply.<br />
TTA/PTTA switchgear assemblies also<br />
include those that are engineered <strong>and</strong><br />
assembled by local panel builders in<br />
2 Heft 7/2004 •