Method for producing toroidal tape cores for fault current safety switches and use of such cores
First Claim
1. A method of producing torodial tape cores for fault current safety switches with a relatively high dynamic induction boost, Bdyn, at least 0.08 T and, simultaneously, a relatively high temperature constancy of Bdyn in the temperature range of about -5°
- to +80°
C. from a toroidal tape core wound out of a 0.05 through 0.3 mm thick tape composed of a Ni-Mo-Cu-Fe alloy such core being subject to thermal treatment in a non-oxidizing atmosphere, said method comprising of;
employing as said alloy a composition having an Ni and Cu content in a binary Ni-Cu system which is defined by an area bounded by a quadrangle of points A (80.5 wt. % Ni and 0 wt. % Cu), B (82 wt. % Ni and 0 wt. % Cu), C (70 wt. % Ni and 16.5 wt. % Cu), and D (70 wt. % Ni and 14.4 wt. % Cu), and having a Mo content, z, in wt. % which satisfies the relation;
space="preserve" listing-type="equation">11/30(x-68)≦
z≦
11/30(x-63.5) with a given Ni content, x, in wt. %. and the remainder consisting essentially of Fe along with minor amounts of impurities and usual processing-promiting and deoxidizing additives;
said thermal treatments in said non-oxidizing atmosphere consisting of annealing said core for at least about 30 minutes at a temperature ranging between 900° and
1200°
C., andthereafter tempering said so annealed tape core in accordance with its Mo content at a temperature ranging between 450° and
550°
C. in such a manner that the magnetic anisotropy K1, thereof becomes equal to 0 at a temperature between -5° and
+30°
C.
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Accused Products
Abstract
In order to improve the temperature constancy of induction boost in a standard working temperature range for fault current safety switches, a Ni-Mo-Cu-Fe alloy is provided whose nickel and copper content in a binary nickel-copper system is defined by a quadrangle of points A (80.5 wt. % Ni and 0 wt. % Cu), B (82 wt. % Ni and 0 wt. % Cu), C (70 wt. % Ni and 16.5 wt. % Cu) and D (70 wt. % Ni and 14.4 wt. % Cu) and whose molybdenum content, z, in wt. % satisfies the relation:
11/30 (x-68)≦z≦11/30 (x-63.5)
with a given Ni content, x, in wt. % and the remainder of which essentially consists of iron and minor processing impurities. Such an alloy is worked into a 0.05 through 0.3 mm thick tape and wound into a toroidal tape core which is first annealed for about 30 minutes at temperatures between 900° and 1200° C. and is then tempered in accordance with its Mo content at the temperatures between 450° and 550° C. in such a manner that the magnetic anisotropy, K1, becomes equal to 0 at temperatures between -5° and +30° C. Such toroidal tape cores are particularly useful as sum current transformer cores or pulse-current-sensitive fault current safety switches, with a trigger current strength of 30 mA.
10 Citations
5 Claims
-
1. A method of producing torodial tape cores for fault current safety switches with a relatively high dynamic induction boost, Bdyn, at least 0.08 T and, simultaneously, a relatively high temperature constancy of Bdyn in the temperature range of about -5°
- to +80°
C. from a toroidal tape core wound out of a 0.05 through 0.3 mm thick tape composed of a Ni-Mo-Cu-Fe alloy such core being subject to thermal treatment in a non-oxidizing atmosphere, said method comprising of;employing as said alloy a composition having an Ni and Cu content in a binary Ni-Cu system which is defined by an area bounded by a quadrangle of points A (80.5 wt. % Ni and 0 wt. % Cu), B (82 wt. % Ni and 0 wt. % Cu), C (70 wt. % Ni and 16.5 wt. % Cu), and D (70 wt. % Ni and 14.4 wt. % Cu), and having a Mo content, z, in wt. % which satisfies the relation;
space="preserve" listing-type="equation">11/30(x-68)≦
z≦
11/30(x-63.5)with a given Ni content, x, in wt. %. and the remainder consisting essentially of Fe along with minor amounts of impurities and usual processing-promiting and deoxidizing additives; said thermal treatments in said non-oxidizing atmosphere consisting of annealing said core for at least about 30 minutes at a temperature ranging between 900° and
1200°
C., andthereafter tempering said so annealed tape core in accordance with its Mo content at a temperature ranging between 450° and
550°
C. in such a manner that the magnetic anisotropy K1, thereof becomes equal to 0 at a temperature between -5° and
+30°
C. - View Dependent Claims (2, 3, 4)
- to +80°
-
5. A toroidal tape core for an electronic safety switch, and for fault current-sensitive safety switches, with a relatively high dynamic induction boost, Bdyn, at least 0.08 T and, simultaneously, a relatively high temperature constancy of Bdyn in the temperature range of about -5°
- to +80°
C.;
said core having been wound out of a 0.05 through 0.3 mm thick tape composed of Ni-Mo-Cu-Fe alloy, such core having been subjected to thermal treatment in a non-oxidizing atmosphere,said alloy having a Ni and Cu content in a binary Ni-Cu system which is defined by an area bounded by a quadrangle of points A (80.5 wt. % Ni and 0 wt. % Cu), B (82 wt. % Ni and 0 wt. % Cu), C (70 wt. % Ni and 16.5 wt. % Cu), and D (70 wt. % Ni and 14.4 wt. % Cu), and having a Mo content, z, in wt. % which satisfies the relation;
space="preserve" listing-type="equation">11/30(x-68)≦
z≦
11/30(x-63.5)with a given Ni content, x, in wt. %, and the remainder consisting essentially of Fe along with minor amounts of impurities and usual processing-promoting and deoxidizing additives; said thermal treatment in said non-oxidizing atmosphere consisting of first annealing said core for at least about 30 minutes at a temperature ranging between 900° and
1200°
C., andthereafter tempering said so annealed tape core in accordance with its Mo content at a temperature ranging between 450° and
550°
C. in such a manner that the magnetic anisotropy K1, thereof becomes equal to 0 at a temperature between -5° and
+30°
C.
- to +80°
Specification