Title of Invention

HIGH PERFORMANCE LOAD RESISTOR

Abstract The present invention concerns a high-performance resistor comprising a plurality of resistor elements (10, 11) which are electrically connected in series and each having a first and a second side (10a, 10b; 11a, 11b) and a first and a second end (10c, 10d; 11c, 11d), wherein provided at the first end (10c, 11c) is a first connection (16a) and provided at the second end (10d; 11d) is a second connection for connection of the resistor elements (10, 11). The first and second connections (16a, 16b) each have an inner portion and an outer portion, wherein the inner portion of the first connection (16a) is bent at a predetermined angle with respect to the first side (10a, 11a) of the resistor element (10, 11) and the outer portion of the first connection (16a) is in a plane which is substantially parallel to the plane of the resistor element (10, 11), and wherein the inner portion of the second connection (16b) is bent at a predetermined angle with respect to the second side (10b, 11b) of the resistor element (10, 11) and the outer portion of the second connection (16b) is in a plane which is substantially parallel to the plane of the resistor element (10, 11).
Full Text The present invention concerns a high-performance resistor having a
plurality of resistor elements which are electrically connected in series.
In the case of known high-performance resistors as are shown in
simplified form in Figure 5 and of which a portion is shown in Figure 6,
different connections are provided depending on the respective placement
of a resistor element within the resistor. The two outer elements of which
one can be seen in Figure 6 have a straight connection and a connection
which is angled over once and which is bent over substantially at a right
angle. The other resistor elements have two respective connection tabs
which are each bent over once at a right angle but which are bent over in
opposite directions.
As can be seen from Figure 5 therefore, to produce a high-
performance resistor, four different kinds of resistor elements are required.
These are a start and an end element 12, 13 as well as a predeterminable
number of right-hand and left-hand intermediate elements 10, 11. While
the intermediate elements 1G, 11 are provided with two connections which
are bent over in opposite directions, the start and end elements 12, 13
each have a straight connection for connection to a circuit and a connection
which is bent over at a right angle for connection to an adjacent resistor
element. Depending on the respective installation situation, the bent-over
connection is bent over towards the left or towards the right.
As adjacent resistor elements are connected together at the
connections which are bent over at a right angle, the length of the bent-
over portion determines the spacing of the adjacent resistor elements
relative to each other. Here therefore the competing requirements are a
structural configuration which is compact as possible (without having
regard to thermal aspects) and an arrangement of the resistor elements,


which is as assembly-friendly as possible. On the one hand, the spacing
between adjacent resistor elements should be as small as possible in the
interests of a compact design configuration, but on the other hand a
greater spacing between adjacent resistor elements is more assembly-
friendly than a smaller spacing.
US No 2 647 978 discloses a high-performance resistor having a
plurality of resistor elements which are electrically connected in series. The
resistor elements are connected together by way of bars. Provided at each
of the two ends of the resistor elements is a respective element, the
connection being at a right angle to the resistor element. A respective
connecting portion is fixed to that connection, resistor elements being
connected together by means of the connecting portions by way of the
bars.
US No 2 662 958 also discloses a high-pet formance resistor with a
plurality of resistor elements electrically connected in series. At their two
ends the resistor elements have respective connections for connecting the
resistor elements.
The object of the invention is to provide a compact and at the same
time assembly-friendly high-performance resistor.
That object is attained by a high-performance resistor as set forth in
claim 1.
In that arrangement, there is provided a high-performance resistor
comprising a plurality of resistor elements which are electrically connected
in series and each having a first and a second side and a first and a second
end, wherein provided at the first end is a first connection and provided at
the second end is a second connection for connection of resistor elements,
characterised in that the first and second connections each have an inner
portion and an outer portion, wherein the inner portion of the first
connection is bent at a predetermined angle with respect to the first side of
the resistor element and the outer portion of the first connection is in a
plane which is substantially parallel to the plane of the resistor element,
and wherein the inner portion of the second connection is bent at a
predetermined angle with respect to the second side of the resistor element


and the outer portion of the second connection is in a plane which is
substantially parallel to the plane of the resistor element.
In that case the invention is based on the realisation that, in the
configuration according to the invention, the spacing of the connections at
one side of the resistor elements and thus the space available in the
assembly procedure between adjacent connections is doubled to twice the
plate spacing. That provides that assembly is remarkably facilitated, while
the spacing between the resistor elements remains the same and thus the
high-performance resistor is of the same structural size.
In a preferred development of the invention the connections are
displaced by a predetermined dimension on both sides with respect to the
longitudinal axis of the resistor element. The fact therefore that one of the
connections is a predetermined dimension above the longitudinal axis and
the other is the same dimension below the longitudinal axis means that it is
possible to construct a high-performance resistor according to the invention
from similar standard resistor elements, by virtue of a suitable
arrangement of the individual resistor elements.
In the above-described manner, there is provided a high-
performance resistor which can be advantageously used as a load resistor
(clump load) in the case of energy producers, in particular wind power
installations. For that purpose a plurality of high-performance resistors can
be arranged in cabinets or other suitable apparatus racks in order thus to
achieve dimensioning (or a sufficiently high permissible power dissipation.
The invention is described in greater detail Hereinafter
with reference to the accompanying figures in which:
Figure 1 shows a petsportive view of a first embodiment of a high-
porfonnance resistor according to the invention,
Figure 2 shows n plan view of the high-performance resistor shown
in Figure 1,
Figure 3 shows a front view of a second embodiment of a high-
performance resistor according to the invention,
Figure 4 shows a perspective side view of the high-performance
resistor shown in Figure 3,


Figure 5 shows a simplified plan view of a known high-performance
resistor, and
Figure 6 shows details of the known high-performance resistor.
Figure 1 shows a perspective view of a first embodiment of a high-
performance resistor. That high-performance resistor comprises first
resistor elements 10 and second resistor elements 11 which are arranged
alternately one behind the other. The structural configuration of the high-
performance resistor, which is shown in this Figure, is achieved by the
resistor elements 10, 11 being threaded on to holders 20 which here are in
the form of screwthreaded rods. Spacer portions 21 are provided in order
to be able to fixedly install the resistor elements. Those spacer portions 21
comprise an insulating material and simultaneously insulate the resistor
elements 10, 11 from the holder 20. That can be effected in known manner
t
by for example a short extension of a spacer portion of a smaller diameter
than that: visible in the Figure engaging into a bore of correspondingly large
size in each of the resistor elements 10, 11 so that the resistor element
rests on the extension (not shown) of the spacer portion (21) therearound
and is thereby insulated from the holder 20. It will be appreciated that the
insulation can also be afforded by one or more suitable sleeves fitted on to
the holdeis.
The electrical connection of the resistor elements 10, 11 to each
other is effected by means of screw connecting means at the connections
16, in which respect other electrically conducting connection means are
also possible. That can be cleaily seen in relation to the foremost resistor
element 10. A connection 16 is free in the view at the right-hand side. That
serves for the electrical connection of the high-performance resistor. Here
therefore for example cables or other suitable counterpart portions can be
easily connected thereto. The left-hand connection 16 of that front resistor
element 10 is connected by means of two screws 23 to the corresponding
connection of the subsequent resistor element 11. The connection of the
individual resistor elements 10, 11 with each other to afford the high-
performance resistor according to the invention can be clearly seen from
Figure 2.


The first and second resistor elements 10, 11 in this case are of such
a configuration that at their two ends they have a respective connection
16a, 16b, wherein one of the connections 16a is bent towards one side 10a
and the other connection 16b is bent towards the other side 10b. Preferably
the connections 16a, 16b have an inner and an outer portion. In that
respect, the inner portion is respectively bent towards a first or a second
side of the resistor element and the outer portion is then again of a
configuration such as to be substantially parallel to the respective resistor
element. The parallel configuration of the outer portions of the connections
16a, 16b substantially simplifies assembly of the respective resistor
elements.
That Figure 2 shows a plan view of a high-performance resistor
according to the invention. Beginning from the lower edge of the view, first
resistor elements 10 and second resistor elements 11 are arranged
alternately and are mechanically connected together by means of holders
20 and spacer portions 21. Apart from the two outer resistor elements, the
adjacent resistor elements 10, 11 are connected together by screws at the
respective mutually facing connections 16. That affords electrically a series
connection of the individual resistor elements 10, 11. At their side which is
at the riglit in this Figure, the two outer resistor elements each have a free
connection 16 at which l.hey can bo connected to the electric feed lines.
It can also be clearly seen from Figure 2 that the intermediate space
between adjacent connections at one side of the high-performance resistor
corresponds to double the spacing between adjacent resistor elements.
Figure 3 shows a further embodiment of a resistor element according
to the invention. That resistor element 10 differs from that of the first
embodiment by the arrangement of the connections 16. These connections
16 are displaced by a predetetmined dimension d1, d2 with respect to the
illustrated longitudinal axis 25 of the resistor element 10, that is to say one
connection is arranged above the longitudinal axis and one is arranged
below it. The further structure substantially corresponds to the structure in
the preceding embodiment. It will be appreciated that this embodiment also
has holders 20 and spacer portions 21. Furthermore, in this embodiment,


adjacent resistor elements are also connected together by screws at the
connections 16 to produce an electrical connection. It can be clearly seen
from this Figure however that the connection 16 in the left-hand region of
the Figure is disposed above the holder 20 while the connection 16 in the
right-hand region of the Figure is disposed by the same dimension below
the corresponding holder 20.
Figure 4 shows a side view of a high-performance resistor of this
second embodiment of the present invention. It is possible once again to
clearly see therefrom the spacer portions 21 which, together with the
holder 20, form the mechanical connection of the resistor elements 10 with
each other. It can also be clearly seen from this Figure that the electrical
connections are again made by screw connections at the connections 16,
wherein the connections 16 at the two outer resistor elements are free in
order to permit electric lines to be connected thereto.
The crucial difference in relation to the first embodiment is that here
only one single resistor element 10 is also required to construct a resistor
according to the invention. That derives from the displaced arrangement of
the connections 16 with respect to the centre line of the resistor element
10. That displaced arrangement makes it possible for the resistor elements
to be connected by a suitably oriented arrangement in accordance with the
invention to provide a high-performance resistor.
As described hereinbefore, preferably flat resistor elements are
provided in accoidance with the invention. The resistor elements are
preferably all of the same or identical structure. The above-described high-
performance resistor can advantageously be used as a load resistor in the
cabinets of the power electronics of a wind power installation or in a
separate apparatus rack in a wind power installation in order to be used as
a clump load. In that respect the dimensioning of the high-porformance
resistors is such that a sufficiently high level of permissible power
dissipation can be achieved.
If the power generated by the electrical generator of the wind power-
installation cannot be delivered to a network or is not to be delivered, that
electrical power is dissipated entirely or partially by way of the high-

performance resistor. Rapid power regulation can thus be effected. As a
power regulation of that kind involves electrical regulation, adjustment of
the pitch angle of the rotor blades of the wind power installation is not
absolutely necessary for the time being.
The high-performance resistor or a plurality of high-performance
resistors is preferably arranged in the proximity of the inverter of the wind
power installation.

I CLAIM :
1. A high-performance resistor comprising:
a plurality of planar resistor elements (10, 11) which are electrically con-
nected in series and each having a first and a second side (10a, 10b; 11a, 11b)
and a first and a second end, wherein provided at the first end is a first connec-
tion (16a) and provided at the second end is a second connection (16b) for re-
leasable connection of adjacent resistor elements (10, 11),
wherein the first and second connections (16a, 16b) each have an inner
portion and an outer portion,
wherein the inner portion of the first connection (16a) is bent at an prede-
termined angle with respect to the first side (10a, 11a) of the resistor element
(10, 11) and the outer portion of the first connection (16a) projects beyond the
resistor element (10, 11) by a predetermined dimension and is in a plane which
is substantially parallel to the plane of the resistor element (10,11),
wherein the inner portion of the second connection (16b) is bent at the
predetermined angle with respect to the second side (10b, 11b) of the resistor
element (10, 11) and the outer portion of the second connection (16b) projects
beyond the resistor element (10, 11) by the predetermined dimension and is in
a plane which is substantially parallel to the plane of the resistor element (10,
11),
wherein adjacent resistor elements are releasably and electrically con-
nected together by way of their outer portions of the first and second connec-
tions,
wherein the first connection (16a) is displaced by a first dimension (d1)
with respect to the longitudinal axis (25) of the resistor element (10, 11) and the
second connection (16a) is displaced by a second dimension (d2) with respect
to the longitudinal axis (25) of the resistor element (10, 11), and
wherein the first dimension (d1) is the same as the second dimension
(d2), and the first connection (16a) and the second connection (16b) is dis-
placed in the opposite direction.

2. A high-performance resistor as claimed in claim 1, wherein the interme-
diate space between adjacent connections at one side of the high-performance
resistor corresponds to double of the spacing between adjacent resistor ele-
ments.
3. A wind power installation having a cabinet of power electronics and at
least one high-performance resistor as claimed in one of claims 1 or 2, wherein
the at least one high-performance resistor is arranged in the power cabinet.

Documents:

03882-kolnp-2006 abstract.pdf

03882-kolnp-2006 claims.pdf

03882-kolnp-2006 description(complete).pdf

03882-kolnp-2006 drawings.pdf

03882-kolnp-2006 form-1.pdf

03882-kolnp-2006 form-3.pdf

03882-kolnp-2006 form-5.pdf

03882-kolnp-2006 gpa.pdf

03882-kolnp-2006 international search authority report.pdf

03882-kolnp-2006 others.pdf

03882-kolnp-2006 pct other document.pdf

03882-kolnp-2006 priority document.pdf

03882-kolnp-2006-correspondence-1.1.pdf

03882-kolnp-2006-correspondence-1.2.pdf

03882-kolnp-2006-form-18.pdf

03882-kolnp-2006-form-3-1.1.pdf

3882-KOLNP-2006-ABSTRACT.pdf

3882-KOLNP-2006-AMANDED CLAIMS.pdf

3882-KOLNP-2006-AMANDED PAGES OF SPECIFICATION.pdf

3882-KOLNP-2006-CORRESPONDENCE 1.3.pdf

3882-KOLNP-2006-CORRESPONDENCE-1.1.pdf

3882-KOLNP-2006-CORRESPONDENCE-1.2.pdf

3882-KOLNP-2006-CORRESPONDENCE.pdf

3882-kolnp-2006-correspondence1.4.pdf

3882-KOLNP-2006-DESCRIPTION (COMPLETE).pdf

3882-KOLNP-2006-DRAWINGS-1.1.pdf

3882-KOLNP-2006-DRAWINGS.pdf

3882-kolnp-2006-examination report.pdf

3882-KOLNP-2006-FORM 1.pdf

3882-kolnp-2006-form 18.pdf

3882-KOLNP-2006-FORM 2.pdf

3882-kolnp-2006-form 3.1.pdf

3882-KOLNP-2006-FORM 3.pdf

3882-kolnp-2006-form 5.pdf

3882-KOLNP-2006-FORM-27.pdf

3882-kolnp-2006-gpa.pdf

3882-kolnp-2006-granted-abstract.pdf

3882-kolnp-2006-granted-claims.pdf

3882-kolnp-2006-granted-description (complete).pdf

3882-kolnp-2006-granted-drawings.pdf

3882-kolnp-2006-granted-form 1.pdf

3882-kolnp-2006-granted-form 2.pdf

3882-kolnp-2006-granted-specification.pdf

3882-KOLNP-2006-OTHERS-1.1.pdf

3882-KOLNP-2006-OTHERS.pdf

3882-KOLNP-2006-PA.pdf

3882-KOLNP-2006-REPLY TO EXAMINATION REPORT-1.1.pdf

3882-KOLNP-2006-REPLY TO EXAMINATION REPORT.pdf

3882-kolnp-2006-reply to examination report1.2.pdf

abstract-03882-kolnp-2006.jpg


Patent Number 247975
Indian Patent Application Number 3882/KOLNP/2006
PG Journal Number 23/2011
Publication Date 10-Jun-2011
Grant Date 07-Jun-2011
Date of Filing 21-Dec-2006
Name of Patentee WOBBEN, ALOYS
Applicant Address ARGESTRASSE 19, 26607 AURICH
Inventors:
# Inventor's Name Inventor's Address
1 WOBBEN, ALOYS ARGESTRASSE 19, 26607 AURICH
PCT International Classification Number H01C3/10
PCT International Application Number PCT/EP2005/007419
PCT International Filing date 2005-07-08
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 10 2004 033 680.6 2004-07-09 Germany