Methods and devices for testing the function of an insulation monitoring device
US-2017315205-A1 · Nov 2, 2017 · US
Method and device for determining the division of a total insulation resistance and the division of a total system leakage capacitance in an ungrounded power supply system
US11002776B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11002776-B2 |
| Application number | US-201916511350-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 15, 2019 |
| Priority date | Jul 17, 2018 |
| Publication date | May 11, 2021 |
| Grant date | May 11, 2021 |
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Abstract
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A method and device for determining a division of a total insulation resistance and of a total system leakage capacitance in an ungrounded power supply system. The basic idea is to determine how the total insulation resistance is divided into partial insulation resistances and how the total system leakage capacitance is divided into partial system leakage capacitances between the active conductors of the ungrounded power supply system from displacement voltages measured between each of the active conductors of the ungrounded power supply system based on values determined in advance for the total insulation resistance and for the total system leakage capacitance of the ungrounded power supply system. By evaluating the displacement voltages in terms of their changes in amplitude, their frequency and their phasing, conclusions can be drawn as to the division of the total insulation resistance and of the total system leakage capacitance between the individual active conductors.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for determining a division of a total insulation resistance (R iso ) in an ungrounded power supply system ( 2 , 12 ) comprising active conductors (L + , L − , L × ) between which a conductor-conductor voltage (U dc , U ac , U acxy ) occurs, the method comprising the method steps of: determining the total insulation resistance (R iso ) of the ungrounded power supply system ( 2 , 12 ), characterized by measuring displacement voltages (U L+_E , U L−_E , U L×_E ) between each of the active conductors (L + , L − , L × ) and ground (E), determining a resistance division factor (r R ), which describes the division of the total insulation resistance (R iso ) into partial insulation resistances (R iso+ , R iso− R iso× ) related to the active conductors (L + , L − , L × ), as a function of at least one of the parameters amplitude, frequency, phase of the displacement voltages (U L+_E , U L−_E , U L×_E ) measured, wherein the resistance division factor (r R ) is determined from the relation of the amplitudes of the displacement voltages (U L×_E ), taking into account the frequency and the phasing of the displacement voltages (U L×_E ).
Assignees
Inventors
Classifications
Testing for short-circuits, leakage current or ground faults · CPC title
Measuring voltage only · CPC title
- G01R27/025Primary
Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters · CPC title
Measuring capacitance (capacitive sensors G01D5/24) · CPC title
- G01R27/02Primary
Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant (by measuring phase angle only G01R25/00) · CPC title
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- What does patent US11002776B2 cover?
- A method and device for determining a division of a total insulation resistance and of a total system leakage capacitance in an ungrounded power supply system. The basic idea is to determine how the total insulation resistance is divided into partial insulation resistances and how the total system leakage capacitance is divided into partial system leakage capacitances between the active conduct…
- Who is the assignee on this patent?
- Bender Gmbh & Co Kg
- What technology area does this patent fall under?
- Primary CPC classification G01R27/025. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue May 11 2021 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).