US4573098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ground voltage suppression
Assignee: Individual
•
Filing: 1983-10-25
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Granted: 1986-02-25
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Expires: 2003-10-25
Abstract
Abstract In a power supply system having a grounded neutral and supplying service equipment through a distribution transformer, a ground voltage suppression device comprises a saturating inductor or like non-linear impedance device connected between the secondary neutral conductor and a normal ground conductor so as to define therewith a neutral-to-ground current path which presents a high impedance to current flow for applied voltages up to a predetermined level.
Inventors
- 👤 Dale B. Williston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:30
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
126 words
In a power supply system including a distribution transformer having primary and secondary windings providing respective input and output terminals, one said input terminal being connected to true ground via a first ground connection and said output terminals being connected via line and neutral conductors to respective terminals of a service panel the neutral terminal being connected to true ground via a second ground connection, the improvement comprising non-linear impedance means formed by a saturating inductor connected between the neutral conductor and one said ground connection and defining with the latter a neutral-to-ground current path, said saturating inductor presenting a high impedance to current flow at applied voltages below a predetermined level and a low impedance to current flow at applied voltages above said predetermined level.
Claim 2
Dependent Claim
126 words
In a power supply system including a distribution transformer having primary and secondary windings providing respective input and output terminals, one said input terminal being connected to true ground via a first ground connection and said output terminals being connected via line and neutral conductors to respective terminals of a service panel the neutral terminal being connected to true ground via a second ground connection, the improvement comprising non-linear impedance means formed by a saturating inductor connected between the neutral conductor and one said ground connection and defining with the latter a neutral-to-ground current path, said saturating inductor presenting a high impedance to current flow at applied voltages below a predetermined level and a low impedance to current flow at applied voltages above said predetermined level.
Claim 3
Dependent Claim
49 words
A power supply system according to claim 1, in which said neutral terminal of the service panel is grounded via said second ground connection the saturating inductor being mounted at the distribution transformer and connected between the neutral conductor and said first ground connection in series with the latter.
Claim 4
Dependent Claim
51 words
A power supply system according to claim 1, wherein the service panel is housed in a metal enclosure and wherein the neutral terminal of the service panel is insulated from the housing, the saturating inductor being connected between said neutral terminal and the second ground connection in series with the latter.
Claim 5
Dependent Claim
25 words
A power supply system according to claim 1, 2 or 3, in which the saturating inductor has a winding uniformly distributed along a toroidal core.
Claim 6
Dependent Claim
69 words
In a power supply system comprising a distribution transformer having primary and secondary windings, each providing line and neutral terminals, ground voltage suppression means comprising a saturating inductor interconnecting said neutral terminals of the primary and secondary windings, the saturating inductor presenting a high impedance to current flow at applied voltages below a predetermined level and a low impedance to current flow at applied voltages below a predetermined level.
Claim 7
Dependent Claim
69 words
In a power supply system comprising a distribution transformer having primary and secondary windings, each providing line and neutral terminals, ground voltage suppression means comprising a saturating inductor interconnecting said neutral terminals of the primary and secondary windings, the saturating inductor presenting a high impedance to current flow at applied voltages below a predetermined level and a low impedance to current flow at applied voltages below a predetermined level.
Claim 8
Dependent Claim
96 words
In a power supply system including a service panel providing line and neutral supply terminals for connection to respective terminals of a supply transformer, the service panel being housed in a metal enclosure which is connected to true ground via a ground connection, the enclosure defining a casing ground, the improvement in which the neutral terminal is connected to the casing ground via a saturating inductor adapted to present a high impedance to current flow at applied voltages below a predetermined level and a low impedance to current flow at applied voltages above said predetermined level.
Claim 9
Dependent Claim
96 words
In a power supply system including a service panel providing line and neutral supply terminals for connection to respective terminals of a supply transformer, the service panel being housed in a metal enclosure which is connected to true ground via a ground connection, the enclosure defining a casing ground, the improvement in which the neutral terminal is connected to the casing ground via a saturating inductor adapted to present a high impedance to current flow at applied voltages below a predetermined level and a low impedance to current flow at applied voltages above said predetermined level.
Claim 10
Dependent Claim
24 words
A power supply system according to claim 5 or 6, in which the saturating inductor has a winding uniformly distributed along a toroidal core.
Claim 11
Dependent Claim
117 words
In a power supply system comprising a distribution transformer having primary and secondary windings, each providing line and neutral terminals, said line and neutral terminals being connected to respective line and neutral terminals of a service panel providing a service ground connected to true ground via a ground connection, said service ground being accessible to farm livestock standing on true ground, the improvement comprising ground voltage suppression means comprising a saturating inductor interconnecting said neutral terminals of the primary and secondary windings, the saturating indicator presenting a high impedance to current flow at applied voltages below a predetermined level of about 14 volts and a low impedance to current flow at applied voltages above said predetermined level.
Claim 12
Dependent Claim
117 words
In a power supply system comprising a distribution transformer having primary and secondary windings, each providing line and neutral terminals, said line and neutral terminals being connected to respective line and neutral terminals of a service panel providing a service ground connected to true ground via a ground connection, said service ground being accessible to farm livestock standing on true ground, the improvement comprising ground voltage suppression means comprising a saturating inductor interconnecting said neutral terminals of the primary and secondary windings, the saturating indicator presenting a high impedance to current flow at applied voltages below a predetermined level of about 14 volts and a low impedance to current flow at applied voltages above said predetermined level.
Claim 13
Dependent Claim
110 words
In a power supply system including a service panel providing line and neutral supply terminals for connection to respective terminals of a supply transformer, the service panel being housed in a metal enclosure which is connected to true ground via a ground connection, the enclosure defining a casing ground which is accessible to farm livestock standing on true ground, the improvement in which the neutral terminal is connected to the casing ground via a saturating inductor adapted to present a high impedance to current flow at applied voltages below a predetermined level of about 14 volts and a low impedance to current flow at applied voltages above said predetermined level.
Claim 14
Dependent Claim
110 words
In a power supply system including a service panel providing line and neutral supply terminals for connection to respective terminals of a supply transformer, the service panel being housed in a metal enclosure which is connected to true ground via a ground connection, the enclosure defining a casing ground which is accessible to farm livestock standing on true ground, the improvement in which the neutral terminal is connected to the casing ground via a saturating inductor adapted to present a high impedance to current flow at applied voltages below a predetermined level of about 14 volts and a low impedance to current flow at applied voltages above said predetermined level.
References Cited (Backward Citations)
US2087340A
Cited
US3855501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-24 | 1989-08-26 | 1990-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-24 | 1993-08-26 | 1994-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-24 | 1997-08-26 | 1998-02-25 | $7700.00 | Window Closed / Lapsed |