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Wissenschaftsservice - Materialforschung - Dr. Viktor Prieb

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Patent:
Electrical protective breaking device with memory element
and memory alloys therefor.

Registered
in Germany (DE 198 51 311 A1),
in Europe (EP 0 999 570 A1) und
in the USA (US 942.640-12)

Priority: 06.11.1998

Inventors and patent holders:
Dr. V. Prieb, Dr. H.G. Steckmann, Dr. L. Neganov



Abstract:

Object of the Invention:
A new electrical low-voltage or high-voltage fuse (breaking memory-fuse) with a breaking insert made of a Cu-base memory alloy that is especially suitable for electrical aims.

Fuse construction:
The memory insert makes possible a new simplified fuse construction with a new-formed case. The insert made of a Cu-base alloy cans be at the same time enlarge to contact blades and cans serve after its rupturing as a triggering indicator.

Properties of the electrical protective breaking device with memory element:
In the case of overload or short-circuit currents in the electrical power system, the insert securely fitted in the fuse breaks itself due to increasing internal mechanical stresses at a point with a calibrated breaking limit.

The tripping of the memory fuse / the rupture of the memory insert takes place at much more lower temperatures compared to blowout fuse. At the insert breaking escape the insert fragments with such a high speed that no arc is generated.

Loose contacts will be automatically reseal up by the mechanical force arising on the memory insert with its heating.

The time/current-characteristics (indication lines) of the invented memory fuse are measured experimentally. These depend on the chemical concentration of a memory alloy, the martensitic "interlocking" deformation, the geometry and the cross section of the memory insert.

New Cu-base memory alloys with special for electrical engineering suitable properties are invented too.


Application fields:
  • The memory fuse or device is invented for use in electronics and electrical engineering, in electrical devices, for switching them off without arcing when they are subjected to thermal loads, overload and short circuit currents.

  • Fuse properties - first of all the highest escape velocity of the insert fragments and the greatest distance between these fragments after the tripping of the fuse / the rupturing of the insert as soon as a low tripping temperature ? are special suitable to protect of the 42-V direct current board net of future auto cars, where the arcing danger is especially very high at the current interrupting.


More:
Patent (full script, emglish) as PDF-file)
Article to Patent (full script, german) as pdf-file
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