Laminar non-linear device with magnetically aligned particles
First Claim
1. An electrical device which comprises(A) a first laminar resistive element which (a) comprises a first surface and a second surface, and (b) is composed of a first electrically non-linear composition which (i) has a resistivity at 25°
- C. of more than 109 ohm-cm and (ii) comprises(1) a first polymeric component, and(2) a first particulate filler dispersed in the first polymeric component;
(B) a second laminar resistive element which (a) comprises a third surface and a fourth surface, said third surface being in physical and electrical contact with the second surface of the first element, and (b) is composed of a second composition which (i) has a resistivity of less than 100 ohm-cm and (ii) comprises(1) a second polymeric component, and(2) a second particulate filler which (a) is magnetic and electrically conductive, and (b) is aligned in discrete regions in the second polymeric component in planes which are perpendicular to the first element;
(C) a first electrode which is in contact with the first surface; and
(D) a second electrode which is in contact with the fourth surface so that current can flow between the electrodes through the first element and the second element.
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Accused Products
Abstract
An electrical device in which a first resistive element which is composed of a first electrically non-linear composition is in electrical contact, and preferably in physical and electrical contact, with a second resistive element which is composed of a second composition which has a resistivity of less than 100 ohm-cm. The first composition has a resistivity of more than 109 ohm-cm and contains a first particulate filler. The second composition contains a second particulate filler which (a) is magnetic and electrically conductive, and (b) is aligned in discrete regions in the second polymeric component. The device also contains first and second electrodes which are positioned so that current can flow between the electrodes through the first and second resistive elements. Devices of the invention have relatively low breakdown voltages and can survive high energy fault conditions.
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Citations
17 Claims
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1. An electrical device which comprises
(A) a first laminar resistive element which (a) comprises a first surface and a second surface, and (b) is composed of a first electrically non-linear composition which (i) has a resistivity at 25° - C. of more than 109 ohm-cm and (ii) comprises
(1) a first polymeric component, and (2) a first particulate filler dispersed in the first polymeric component; (B) a second laminar resistive element which (a) comprises a third surface and a fourth surface, said third surface being in physical and electrical contact with the second surface of the first element, and (b) is composed of a second composition which (i) has a resistivity of less than 100 ohm-cm and (ii) comprises (1) a second polymeric component, and (2) a second particulate filler which (a) is magnetic and electrically conductive, and (b) is aligned in discrete regions in the second polymeric component in planes which are perpendicular to the first element; (C) a first electrode which is in contact with the first surface; and (D) a second electrode which is in contact with the fourth surface so that current can flow between the electrodes through the first element and the second element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- C. of more than 109 ohm-cm and (ii) comprises
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15. An electrical device which comprises
(A) a first laminar resistive element which (a) comprises a first surface and a second surface, and (b) is composed of a first electrically non-linear composition which (i) has a resistivity at 25° - C. of more than 109 ohm/cm and (ii) comprises
(1) a first polymeric component which is a gel, (2) a first particulate filler dispersed in the first polymeric component which is a conductive filler or a semiconductive filler, and (3) a third particulate filler dispersed in the first polymeric component which is an arc suppressant, an oxidizing agent, or a surge initiator; (B) a second laminar resistive dement which (a) comprises a third surface and a fourth surface, said third surface being in physical and electrical contact with the second surface of the first element in physical and electrical contact with the second surface, and (b) (i) is in physical and electrical contact with the first element, (ii) has a resistance at 25°
C. of less than 100 ohms, and (iii) is composed of a second composition which has a resistivity at 25°
C. of at most 100 ohm-cm and which comprises(1) a second polymeric component which is a gel, (2) a second particulate filler which (a) is magnetic and electrically conductive, and (b) is aligned in discrete regions in the second polymeric component planes which are perpendicular to the first element, and (3) a fourth particulate filler dispersed in the second polymeric component which is an arc suppressant, an oxidizing agent, or a surge initiator; and (C) a first electrode which is in contact with the first surface; and (D) a second electrode which is in contact with the fourth surface so that current can flow between the electrodes through the first element and the second element, said device having a breakdown voltage when measured at 60 A in a Standard Impulse Breakdown Test of less than 1000 volts. - View Dependent Claims (16, 17)
- C. of more than 109 ohm/cm and (ii) comprises
Specification