Patent US3824431A successfully refreshed from Google Patents.
US3824431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High voltage suppressor for transmission lines
Assignee: Allen Bradley Co LLC
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Filing: 1973-05-10
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Granted: 1974-07-16
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Expires: 1993-05-10
Abstract
Abstract A compensated high voltage suppressor for insertion in a transmission line is shown for shunting large interference voltages from the line to ground. The suppressor has a varistor material through which the large interference voltages are shunted, and this material also functions as a capacitor dielectric. Additional circuit components are connected with this capacitance to form a low pass filter in the transmission line which has a characteristic impedance substantially matching the line characteristic impedance. This impedance matching maintains effective transmission for power, or signals conducted along the line in the normal mode of operation.
Inventors
- 👤 H Schlicke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:41
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/005
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
161 words
In a voltage suppressor for an electrical line exhibiting a characteristic impedance for a normal mode of operation, the combination comprising: an electrically shielding shell with a shunting terminal for conducting currents to ground; input and output conductors entering and leaving said shell connectable to said electrical line; a shunting element associated with said shell having a dielectric of varistor material with electrodes on opposing sides thereof, one electrode in connection with one of said conductors, the other electrode in connection with said shunting terminal; an impedance element within said shell and in series connection with said conductors forming a low pass filter with said shunting element during said normal mode of operation; and said dielectric exhibiting capacitive characteristics in said normal mode of operation, and having an ohmic current conducting characteristic according to the relationship I KV in which the exponent alpha is greater than 10 and ohmic current flows for voltages above those of said normal mode of operation.
Claim 2
Dependent Claim
161 words
In a voltage suppressor for an electrical line exhibiting a characteristic impedance for a normal mode of operation, the combination comprising: an electrically shielding shell with a shunting terminal for conducting currents to ground; input and output conductors entering and leaving said shell connectable to said electrical line; a shunting element associated with said shell having a dielectric of varistor material with electrodes on opposing sides thereof, one electrode in connection with one of said conductors, the other electrode in connection with said shunting terminal; an impedance element within said shell and in series connection with said conductors forming a low pass filter with said shunting element during said normal mode of operation; and said dielectric exhibiting capacitive characteristics in said normal mode of operation, and having an ohmic current conducting characteristic according to the relationship I KV in which the exponent alpha is greater than 10 and ohmic current flows for voltages above those of said normal mode of operation.
Claim 3
Dependent Claim
28 words
A voltage suppressor as in claim 1, wherein the characteristic impedance of said low pass filter substantially matches said line characteristic impedance for said normal mode of operation.
Claim 4
Dependent Claim
28 words
A voltage suppressor as in claim 1, wherein the dielectric constant of the varisTor material is less than 500 and the value of alpha is at least 10.
Claim 5
Dependent Claim
19 words
A voltage suppressor as in claim 1, wherein the dielectric constant of the varistor material decreases with increasing frequency.
Claim 6
Dependent Claim
123 words
In a voltage suppressor for connection to a transmission line comprised of a pair of paths over which regular signals are conducted, the combination comprising: an electrical bypass to ground; a capacitance for between each transmission line path and said bypass, each capacitance having a dielectric material that has a transition to low resistance at selected voltages above those of regular signals; impedances for series relation with each transmission line path, the capacitances and impedances presenting a low pass filter network with a characteristic impedance substantially matching the characteristic impedance of the transmission line for a range of regular transmission frequencies; and such impedances are each an inductor and capacitor in parallel, and form T-filters with the capacitances having a varistor dielectric material.
Claim 7
Dependent Claim
123 words
In a voltage suppressor for connection to a transmission line comprised of a pair of paths over which regular signals are conducted, the combination comprising: an electrical bypass to ground; a capacitance for between each transmission line path and said bypass, each capacitance having a dielectric material that has a transition to low resistance at selected voltages above those of regular signals; impedances for series relation with each transmission line path, the capacitances and impedances presenting a low pass filter network with a characteristic impedance substantially matching the characteristic impedance of the transmission line for a range of regular transmission frequencies; and such impedances are each an inductor and capacitor in parallel, and form T-filters with the capacitances having a varistor dielectric material.
Claim 8
Dependent Claim
111 words
In a voltage suppressor for a pair of transmission line paths, the combination comprising: a shielding enclosure; a pair of inputs and a pair of outputs for the enclosure; a bypass connection disposed outside the enclosure; input capacitor elements at one end of said enclosure having: dielectrics of varistor material, electrode surfaces connected to said inputs, and electrode surfaces connected to said bypass connection; output capacitor elements at the other end of said enclosure having dielectrics of varistor material, electrode surfaces connected to said outputs, and electrode surfaces connected to said bypass connection; and inductances within said enclosure disposed between the capacitor electrodes that are joined to the inputs and outputs.
Claim 9
Dependent Claim
111 words
In a voltage suppressor for a pair of transmission line paths, the combination comprising: a shielding enclosure; a pair of inputs and a pair of outputs for the enclosure; a bypass connection disposed outside the enclosure; input capacitor elements at one end of said enclosure having: dielectrics of varistor material, electrode surfaces connected to said inputs, and electrode surfaces connected to said bypass connection; output capacitor elements at the other end of said enclosure having dielectrics of varistor material, electrode surfaces connected to said outputs, and electrode surfaces connected to said bypass connection; and inductances within said enclosure disposed between the capacitor electrodes that are joined to the inputs and outputs.
Claim 10
Dependent Claim
26 words
A voltage suppressor as in claim 6, wherein the inductances and capacitor elements present a characteristic impedance matching the characteristic impedance of the transmission line paths.
Claim 11
Dependent Claim
29 words
A voltage suppressor as in claim 6, wherein the varistor material is a zinc oxide having an alpha of at least 10 and a dielectric constant less than 500.
Claim 12
Dependent Claim
19 words
A voltage suppressor as in claim 6, wherein the varistor material has a dielectric constant that decreases with frequency.
Claim 13
Dependent Claim
155 words
In a voltage suppressor for connection to a pair of transmission line paths, the combination comprising: a shielding; a bypass conductor on said shielding; a first input capacitor element having a varistor material dielectric, such capacitor element electrically disposed between one of said paths and said bypass conductor; a second input capacitor element having a varistor material dielectric, such capacitor element electrically disposed between the other of said paths and said bypass conductor; a first inductance disposed within said shielding joined to the first input capacitor on the side opposite the bypass conductor; a second inductance disposed within said shielding joined to the second input capacitor on the side opposite the bypass conductor; a first output capacitor element having a varistor material dielectric connected between one of said inductances and said bypass conductor; and a second output capacitor element having a varistor material dielectric connected between the other of said inductances and said bypass conductor.
Claim 14
Dependent Claim
155 words
In a voltage suppressor for connection to a pair of transmission line paths, the combination comprising: a shielding; a bypass conductor on said shielding; a first input capacitor element having a varistor material dielectric, such capacitor element electrically disposed between one of said paths and said bypass conductor; a second input capacitor element having a varistor material dielectric, such capacitor element electrically disposed between the other of said paths and said bypass conductor; a first inductance disposed within said shielding joined to the first input capacitor on the side opposite the bypass conductor; a second inductance disposed within said shielding joined to the second input capacitor on the side opposite the bypass conductor; a first output capacitor element having a varistor material dielectric connected between one of said inductances and said bypass conductor; and a second output capacitor element having a varistor material dielectric connected between the other of said inductances and said bypass conductor.
Claim 15
Dependent Claim
23 words
A voltage suppressor as in claim 10 wherein the characteristic impedance of the suppressor matches the characteristic impedance of the transmission line paths.
Claim 16
Dependent Claim
123 words
In a voltage suppressor for a transmission line, the combination comprising: a tubular metallic shell; an end wall at each end of the shell formed of dielectric material; at least one of said end walls also being a varistor type material; a pair of conductors passing through the shell and the end walls, such conductors having inductance at points between said end walls; first capacitoR electrodes, each on a surface of one of said end walls, which are spaced from the conductors, such electrodes being connected to said shell; and second capacitor electrodes on surfaces of the end walls opposite from the first electrodes that are each individually connected to one of said conductors, to provide capacitance between each conductor and said shell.
Claim 17
Dependent Claim
123 words
In a voltage suppressor for a transmission line, the combination comprising: a tubular metallic shell; an end wall at each end of the shell formed of dielectric material; at least one of said end walls also being a varistor type material; a pair of conductors passing through the shell and the end walls, such conductors having inductance at points between said end walls; first capacitoR electrodes, each on a surface of one of said end walls, which are spaced from the conductors, such electrodes being connected to said shell; and second capacitor electrodes on surfaces of the end walls opposite from the first electrodes that are each individually connected to one of said conductors, to provide capacitance between each conductor and said shell.
Claim 18
Dependent Claim
126 words
In a voltage suppressor for a transmission line, the combination comprising: a tubular metallic shell having end caps; a varistor-capacitor element inside said shell having a body of varistor material that also presents a capacitive dielectric constant, and further having a first electrode on one side that is connected to said shell, and second electrodes of the opposite side; a pair of conductors each joined at a point between its ends to one of said second electrodes; a set of four capacitors inside said shell each connected to an end of one of said conductors; a set of four inductors inside said shell each across one of said set of four capacitors; and additional conductors extending from said four capacitors to the exterior of the shell.
Claim 19
Dependent Claim
126 words
In a voltage suppressor for a transmission line, the combination comprising: a tubular metallic shell having end caps; a varistor-capacitor element inside said shell having a body of varistor material that also presents a capacitive dielectric constant, and further having a first electrode on one side that is connected to said shell, and second electrodes of the opposite side; a pair of conductors each joined at a point between its ends to one of said second electrodes; a set of four capacitors inside said shell each connected to an end of one of said conductors; a set of four inductors inside said shell each across one of said set of four capacitors; and additional conductors extending from said four capacitors to the exterior of the shell.
References Cited (Backward Citations)
US2665376A
Cited
US3457527A
Cited
US3521200A
Cited
US3268744A
Cited
US3506936A
Cited
US3572247A
Cited
US3693053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |