Andrew S Sweetana from 4112 E Saratoga Dr, Blmgtn, IN 47408

Surge Arrester Equipped For Monitoring Functions And Method Of Use
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US Patent:

45771480, Mar 18, 1986
Filed:

Dec 17, 1982
Appl. No.:

6/450584
Inventors:

Andrew S. Sweetana - Bloomington IN
Assignee:

Westinghouse Electric Corp. - Pittsburgh PA
International Classification:

G01R 3102
US Classification:

324 72
Abstract:

A metal oxide type surge arrester is provided with a plurality of arrester blocks in series within a housing having, in addition to line and ground terminals at the extremities, a bushing providing a tap voltage terminal intermediate the series stack such as between the bottom two arrester blocks. The provision of the voltage tap and a shunt resistance in series with the ground terminal permits respectively detecting the voltage and the current of the arrester so that they can be compared and their phase relation observed to determine if the arrester blocks are maintaining a capacitive characteristic or have become resistive. In addition, several other methods of use of such an arrester for monitoring line voltage, energy absorption, fault current and the like are disclosed.

Voltage Stable Nonlinear Resistor Containing Minor Amounts Of Aluminum, Boron And Selected Alkali Metal Additives
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US Patent:

44527284, Jun 5, 1984
Filed:

Feb 18, 1983
Appl. No.:

6/467974
Inventors:

William G. Carlson - Murrysville PA
Tapan K. Gupta - Monroeville PA
Andrew S. Sweetana - Bloomington IN
Assignee:

Westinghouse Electric Corp. - Pittsburgh PA
International Classification:

H01B 106
US Classification:

252518
Abstract:

A sintered nonlinear resistor body, useful in gapless lightning arresters comprises a major amount of ZnO and additional metal oxides including at least Al. sub. 2 O. sub. 3 and an amount of boron oxide of from about 0. 005 mole % to about 0. 6 mole %, in combination with a total amount of at least one selected alkali metal oxide of from about 0. 005 mole % to about 0. 3 mole %.

High Energy Absorbing Varistor
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US Patent:

51422646, Aug 25, 1992
Filed:

Dec 15, 1989
Appl. No.:

7/452265
Inventors:

Kenneth C. Radford - North Huntingdon PA
Robert G. Johnson - Bloomington IN
Andrew S. Sweetana - Bloomington IN
Assignee:

Electric Power Research Institute, Inc. - Palo Alto CA
International Classification:

H01C 710
US Classification:

338 21
Abstract:

A method for producing varistors having high energy absorption. The high energy absorption is achieved by combining predetermined quantities of Bi. sub. 2 O. sub. 3, BaO, SiO. sub. 2 and Sb. sub. 2 O. sub. 3 with ZnO to produce a mixture which is sintered to produce a varistor disc having high energy absorption.

Capacitive Voltage Transformer With Improved Ferroresonance Protection Device
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US Patent:

T9670084, Feb 7, 1978
Filed:

Apr 7, 1977
Appl. No.:

5/785380
Inventors:

Andrew S. Sweetana - Bloomington IN
Frederick J. Brown - Ellettsville IN
Gerald B. Boyette - Bloomington IN
Assignee:

Westinghouse Electric Corporation - Pittsburgh PA
International Classification:

G05F 306
US Classification:

323 61
Abstract:

a coupling capacitor protection device with a voltage limiter connected across the tap capacitor feeding the induction transformer primary winding. The suppressor is a ceramic oxide nonlinear resistor changing from high to low resistance, thereby limiting the tap voltage to less than that at which the induction transformer core saturates in order to minimize ferroresonance in the circuit. Also, the limiter gives voltage protection to the tap capacitor circuit.

Gapless Surge Arrester
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US Patent:

42233666, Sep 16, 1980
Filed:

Nov 15, 1978
Appl. No.:

5/961011
Inventors:

Andrew S. Sweetana - Bloomington IN
Tapan K. Gupta - Monroeville PA
Richard E. Kothmann - Pittsburgh PA
Joseph C. Osterhout - Bloomington IN
Assignee:

Electric Power Research Institute, Inc. - Palo Alto CA
International Classification:

H02H 322
H02H 904
US Classification:

361127
Abstract:

A gapless surge arrester is disclosed herein and includes a porcelain outer casing and a stack of zinc oxide discs located within the casing for passing surge currents therethrough. Silicon dioxide, preferably sand, is provided between this stack in the casing for transferring heat from the discs to the porcelain outer casing as a result of the surge current and for absorbing fault energy where necessary by changing states.

Surge Stability Improvement Of Zinc Oxide Varistor Discs
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US Patent:

52641694, Nov 23, 1993
Filed:

Apr 23, 1991
Appl. No.:

7/690092
Inventors:

Kenneth C. Radford - North Huntingdon PA
Robert G. Johnson - Bloomington IN
Andrew S. Sweetana - Bloomington IN
Assignee:

Electric Power Research Institute, Inc. - Palo Alto CA
International Classification:

C04B 4180
B29C 7100
US Classification:

264 66
Abstract:

A method of manufacturing a varistor utilizes preselected amounts of ZnO which are combined with specified amounts of additives including B, Na, Bi. sub. 2 O. sub. 3 and BaO to form a variety of compositions. Each composition is pressed into a disc. The disc is then sintered at a first selected temperature. Afterwards, the disc is annealed at a second selected temperature. The specific compositions disclosed render a varistor with improved high temperature performance when the annealing step is followed with a low temperature tempering cycle at approximately 250. degree. C.

Voltage Limiting Composition And Method Of Fabricating The Same
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US Patent:

45499810, Oct 29, 1985
Filed:

Sep 17, 1982
Appl. No.:

6/419160
Inventors:

Tapan K. Gupta - Monroeville PA
William G. Carlson - Murrysville PA
Joseph C. Osterhout - Bloomington IN
Gerald B. Boyette - Bloomington IN
Andrew S. Sweetana - Bloomington IN
Assignee:

Electric Power Research Institute, Inc. - Palo Alto CA
International Classification:

H01B 106
US Classification:

252518
Abstract:

A voltage limiting composition, actually a nonlinear resistor, especially suitable for use in a gapless surge arrester is disclosed herein. This composition includes a predetermined amount of zinc oxide as its primary ingredient and one or more specifically selected additives. All of these constituents are combined and sintered so that the composition displays a nonlinear exponent. alpha. at least equal to about 35 over the current range of 1 ma to 5000 amps and such that its energy absorption capability is at least equal to about 50 joules/cm. sup. 3.

Voltage Stable Nonlinear Resistor Containing Minor Amounts Of Aluminum And Boron
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US Patent:

44527292, Jun 5, 1984
Filed:

Nov 3, 1982
Appl. No.:

6/439016
Inventors:

William G. Carlson - Murrysville PA
Tapan K. Gupta - Monroeville PA
Andrew S. Sweetana - Bloomington IN
Assignee:

Westinghouse Electric Corp. - Pittsburgh PA
International Classification:

A01B 106
US Classification:

252518
Abstract:

A sintered nonlinear resistor body, useful in gapless lightning arresters comprises a major amount of ZnO and additional metal oxides including at least Al. sub. 2 O. sub. 3 and an amount of boron oxide of from about 0. 005 mole % to about 0. 25 mole %.