Spark gap assembly for overvoltage protection and surge arrester
US-11973322-B2 · Apr 30, 2024 · US
Graded spark gap design for internally gapped surge arrester
US12494308B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12494308-B2 |
| Application number | US-202318112888-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 22, 2023 |
| Priority date | Feb 23, 2022 |
| Publication date | Dec 9, 2025 |
| Grant date | Dec 9, 2025 |
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- Title
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- Abstract
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Abstract
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An arrester including a metal oxide varistor (MOV) disc and a spark gap assembly electrically connected in series with the MOV disc. The spark gap assembly includes a spark gap and a frequency-dependent grading capacitor electrically connected in parallel with the spark gap.
First claim
Opening claim text (preview).
What is claimed is: 1 . An arrester comprising: a metal oxide varistor (MOV) disc; and a spark gap assembly electrically connected in series with the MOV disc, the spark gap assembly including, a spark gap; and a frequency-dependent grading capacitor electrically connected in parallel with the spark gap, wherein a capacitance of the frequency-dependent grading capacitor decreases as a frequency of a voltage across the frequency-dependent grading capacitor increases. 2 . The arrester of claim 1 , wherein the capacitance of the frequency-dependent grading capacitor decreases by at least 40% when the frequency of the voltage across the frequency-dependent capacitor increases from 60 Hertz (Hz) to 500 KHz. 3 . The arrester of claim 1 , wherein the capacitance of the frequency-dependent grading capacitor decreases by at least 75% when the frequency of the voltage across the frequency-dependent capacitor increases from 60 Hertz (Hz) to 500 kHz. 4 . The arrester of claim 1 , wherein the frequency-dependent grading capacitor is constructed from a material including at least one of a donor-doped ferroelectric ceramic, a relaxor ferroelectric ceramic, and an insulator-conductor composite that exhibits enhanced low frequency permittivity due to space charge effects. 5 . The arrester of claim 1 , wherein the frequency-dependent grading capacitor has a dielectric loss tangent that is less than 15% when the frequency of the voltage across the frequency-dependent capacitor is 60 Hz. 6 . The arrester of claim 1 , wherein the frequency-dependent grading capacitor has a dielectric loss tangent that is less than 5% when the frequency of the voltage across the frequency-dependent capacitor is 60 Hz. 7 . The arrester of claim 1 , wherein an impedance of the frequency-dependent grading capacitor is a first percentage of a total series impedance of the arrester when a frequency of a voltage across the frequency-dependent grading capacitor is at a first frequency; and wherein the impedance of the frequency-dependent grading capacitor increases to a second percentage of the total series impedance of the arrester when the frequency of the voltage across the frequency-dependent grading capacitor increases to a second frequency. 8 . The arrester of claim 1 , wherein an impedance of the frequency-dependent grading capacitor is less than 50% of a total series impedance of the arrester when a frequency of the voltage across the frequency-dependent grading capacitor is 60 Hz; and wherein the impedance of the frequency-dependent grading capacitor increases to at least 80% of the total series impedance of the arrester when the frequency of the voltage across the frequency-dependent grading capacitor increases to 30 kHz-1 MHz. 9 . The arrester of claim 1 , wherein one or more included MOV disc(s) are constructed from predominantly zinc oxide. 10 . An accessory device electrically connected in series with an arrester, the accessory device comprising: a spark gap assembly including: a spark gap; and a frequency-dependent grading capacitor electrically connected in parallel with the spark gap, wherein a capacitance of frequency-dependent grading capacitor decreases as a frequency of a voltage across the frequency-dependent grading capacitor increases. 11 . The accessory device of claim 10 , wherein the frequency-dependent grading capacitor is constructed from a material including at least one of a donor-doped ferroelectric ceramic, a relaxor ferroelectric ceramic, and a conductor-insulator composite that exhibits enhanced low frequency permittivity due to space charge effects. 12 . The accessory device of claim 10 , wherein the capacitance of the frequency-dependent grading capacitor decreases by at least 40% when the frequency of the voltage across the frequency-dependent capacitor increases from 60 Hertz (Hz) to 500 kHz. 13 . The accessory device of claim 10 , wherein the capacitance of the frequency-dependent grading capacitor decreases by at least 75% when the frequency of the voltage across the frequency-dependent capacitor increases from 60 Hertz (Hz) to 500 KHz. 14 . The accessory device of claim 10 , wherein the frequency-dependent grading capacitor has a dielectric loss tangent that is less than 15% when the frequency of the voltage across the frequency-dependent capacitor is 60 Hz. 15 . The accessory device of claim 10 , wherein the frequency-dependent grading capacitor has a dielectric loss tangent that is less than 5% when the frequency of the voltage across the frequency-dependent capacitor is 60 Hz. 16 . The accessory device of claim 10 , wherein an impedance of the frequency-dependent grading capacitor is a first percentage of a combined series impedance of the frequency-dependent grading capacitor and the arrester when a frequency of a voltage across the frequency-dependent grading capacitor is at a first frequency; and wherein the impedance of the frequency-dependent grading capacitor increases to a second percentage of the combined series impedance of the frequency-dependent grading capacitor and the arrester when the frequency of the voltage across the frequency-dependent grading capacitor increases to a second frequency. 17 . The accessory device of claim 16 , wherein an impedance of the frequency-dependent grading capacitor is less than 50% of a combined series impedance of the frequency-dependent capacitor and the arrester when a frequency of the voltage across the frequency-dependent capacitor is 60 Hz. 18 . The accessory device of claim 17 , wherein an impedance of the frequency-dependent grading capacitor is at least 80% of a combined series impedance of the frequency-dependent capacitor and the arrester when a frequency of the voltage across the frequency-dependent capacitor is greater than 30 kHz.
Assignees
Inventors
Classifications
Overvoltage arresters using spark gaps (H01T2/00 takes precedence; overvoltage protection circuits using spark gaps H02H9/06) · CPC title
- H01C7/12Primary
Overvoltage protection resistors; Arresters · CPC title
Arrangements for improving potential distribution · CPC title
- H01T4/06Primary
Mounting arrangements for a plurality of overvoltage arresters · CPC title
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Frequently asked questions
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- What does patent US12494308B2 cover?
- An arrester including a metal oxide varistor (MOV) disc and a spark gap assembly electrically connected in series with the MOV disc. The spark gap assembly includes a spark gap and a frequency-dependent grading capacitor electrically connected in parallel with the spark gap.
- Who is the assignee on this patent?
- Hubbell Inc
- What technology area does this patent fall under?
- Primary CPC classification H01C7/12. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Dec 09 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).