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公开(公告)号：AT262726T
公开(公告)日：2004-04-15
申请号：AT98811171
申请日：1998-11-26
Applicant: ABB RESEARCH LTD
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公开(公告)号：DE19727009A1
公开(公告)日：1999-01-07
申请号：DE19727009
申请日：1997-06-25
Applicant: ABB RESEARCH LTD
Inventor： STRUEMPLER RALF DR , KUHLEFELT JAN H W
Abstract: The current limiting resistor comprises two parallel connection electrodes, a resistance body contacted by the electrodes and with PTC properties, and at least one cylindrically symmetrical varistor in electric contact with the resistance body. The varistor is columnar and comprises at least two first sections arranged perpendicularly to the varistor axis. A second section arranged between the first sections has a reduced cross-section opposite the first section, or may be part of a cylindrically symmetrical stack of at least two varistors, which are spaced by a spacer element with a reduced cross-section in the axial direction with respect to the varistors. The material of the resistance body fills a space formed by the first sections and the second section, or by the varistors and the spacer element, whereby its outer edges enclose the first sections or varistors.
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公开(公告)号：AT218242T
公开(公告)日：2002-06-15
申请号：AT98811217
申请日：1998-12-10
Applicant: ABB RESEARCH LTD
Inventor： GLATZ-REICHENBACH JOACHIM DR , STRUEMPLER RALF DR , SKINDHOJ JOERGEN DR , GREUTER FELIX DR
Abstract: The resistor body of a nonlinear resistor element having PTC characteristics includes a pulverulent first filler, whose material, e.g. TiB2, TiC, VC, WC, ZrBr2, MoSi2, has a specific conductivity of at most 10-3 OMEGA cm and in which the particle sizes are between 10 and 40 mu , and also, in order to improve the voltage sustaining capability by extending the switching zone and to achieve uniform energy absorption, includes a likewise pulverulent second filler having varistor characteristics and particle sizes between 50 and 200 mu , whose specific resistance at field strengths >/=2000 V/cm such as occur in the switching region of the resistor element and above, is at most 50 OMEGA cm, preferably at most 15 OMEGA cm, the fillers being embedded in a matrix made of a thermoplastic, in particular HD polyethylene or a thermoset. The average particle size of the second filler should exceed that of the first filler by a factor of from 2 to 5. A potentially particularly suitable material for the second filler is SiC doped with Al, B, Ga, In, N, P, As, as is similarly doped ZnO.
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公开(公告)号：DE19800470A1
公开(公告)日：1999-07-15
申请号：DE19800470
申请日：1998-01-09
Applicant: ABB RESEARCH LTD
Inventor： GLATZ-REICHENBACH JOACHIM DR , STRUEMPLER RALF DR , SKINDHOJ JOERGEN DR , GREUTER FELIX DR
Abstract: A resistor comprises a polymer matrix containing a low resistivity first filler and a second filler with a resistivity which decreases with increasing field strength and which has a specified maximum value at high field strengths. An electric resistor element with a resistive body of a polymer matrix, a first filler powder with a resistivity of \}10 OMICRON .cm and a second filler powder with a resistivity which decreases with increasing field strength and which has a value of \}50 OMICRON .cm at field strengths of \-2000 V/cm. Preferred Features: The second filler has a resistivity of \-10 OMICRON .cm and an average particle size greater than that of the first filler, the quotient of the average particle size of the first filler and that of the second filler being 2-5. The first filler consists of TiB2, TiC, VC, WC or ZrB2 of 10-40 mu m particle size and the second filler consists of doped SiC or doped ZnO of 50-200 mu m particle size. The resistive body contains 30-70 vol.% first filler and 10-40 vol.% second filler.
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公开(公告)号：DE59306823D1
公开(公告)日：1997-07-31
申请号：DE59306823
申请日：1993-08-25
Applicant: ABB RESEARCH LTD
Inventor： BAIATU TUDOR DR , GREUTER FELIX DR , STRUEMPLER RALF DR
Abstract: The electrical resistor element (10) contains, arranged between two plane-parallel electrodes (1, 2) exposed to pressure, a resistor body (3) having a positive temperature characteristic and comprising a polymer matrix and two filler components of electrically conductive particles embedded in the polymer matrix (4). When a short-circuit occurs, the resistivity of the resistor body (3) changes suddenly above a temperature limit value in a surface layer located on the electrodes and containing at least a first of the two filler components. A second of the two filler components is selected such that a binder material containing at least a polymer matrix and a second filler component has a positive temperature characteristic with a step response which is at least an order of magnitude higher than the surface layer. At the same time, this binder material has a resistivity which is at least an order of magnitude less than a binder material formed by polymer matrix and a first filter component. The resistor element has a high rated current-carrying capacity and can limit large short-circuit currents with long-lasting effect.
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Patent Agency Ranking
公开(公告)号：DE19548741A1
公开(公告)日：1997-06-26
申请号：DE19548741
申请日：1995-12-23
Applicant: ABB RESEARCH LTD
IPC: H01C7/02
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公开(公告)号：DE19534442A1
公开(公告)日：1997-03-27
申请号：DE19534442
申请日：1995-09-16
Applicant: ABB RESEARCH LTD
Inventor： GLATZ-REICHENBACH JOACHIM DR , KUHLEFELT JAN , STRUEMPLER RALF DR
Abstract: The device includes a high-voltage current conductor (R) with a switch point (CB) arranged in the conductor path, and a activator coil (TC) which operates the switch. A current converter (CT) mirrors currents in conductor (R) in a secondary current loop which contains the activator coil. If the mirrored current oversteps a predetermined threshold value, it causes an activation of the coil, and therefore the switch. At least one PTC element is connected in parallel to the activator coil, whose resistance rises above a certain threshold value of the current in the secondary current loop.
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公开(公告)号：AT352846T
公开(公告)日：2007-02-15
申请号：AT00810069
申请日：2000-01-25
Applicant: ABB RESEARCH LTD
Inventor： GLATZ-REICHENBACH JOACHIM DR , STRUEMPLER RALF DR
IPC: H01C7/02
Abstract: The invention relates to an electrical device with a PTC polymer element having a constriction. The constriction defines a web extending in a main current direction over a length longer than in the prior art, namely longer than 5 mm, preferably longer than 15 mm. Further, the aperture angle of the PTC polymer material at the ends of the web is larger than 100 DEG . A preferred choice of material is given, further. The invention achieves very high voltage-withstand capabilities.
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公开(公告)号：DE19754976A1
公开(公告)日：1999-06-17
申请号：DE19754976
申请日：1997-12-11
Applicant: ABB RESEARCH LTD
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公开(公告)号：DE59406312D1
公开(公告)日：1998-07-30
申请号：DE59406312
申请日：1994-09-23
Applicant: ABB RESEARCH LTD
Inventor： GREUTER FELIX DR , STRUEMPLER RALF DR
Abstract: The composite material has a filler and a matrix embedding the filler. At least one physical variable produces in this composite material at least two non-linear changes of one material property or at least one non-linear change in each case of one of at least two material properties by acting on the filler and/or the matrix. The filler predominantly contains a component with particles of a core-shell structure and/or of a granular microstructure. However, filler with particles of a granular microstructure does not contain any further filler component with electrically conductive particles whose electrical conductivity is higher than the electrical conductivity of the particles of a granular microstructure in the effect of an electric field leading to a non-linear change of the electrical conductivity of the composite material. The composite material is simple to produce and, by suitable selection of the filler and of the matrix, can be easily adapted in its material properties to a specified set of requirements.
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