Power transformer inrush current detector
US-2015349511-A1 · Dec 3, 2015 · US
Current source converter differential protection method and relay protection device
US9584007B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9584007-B2 |
| Application number | US-201414894944-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 14, 2014 |
| Priority date | May 30, 2013 |
| Publication date | Feb 28, 2017 |
| Grant date | Feb 28, 2017 |
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Abstract
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Embodiments of the present invention disclose a current source converter differential protection method, including: sampling, by a relay protection device, secondary side currents of current transformers on two sides of a protected current source converter, to obtain incomer-side three-phase currents, and outgoer-side three-phase currents; rectifying the incomer-side three-phase currents and the outgoer-side three-phase currents, to obtain an incomer-side input current and an outgoer-side output current which are equivalent; converting the incomer-side input current and the outgoer-side output current according to a current ratio of the current transformers on the two sides, to acquire a transient differential current and a transient restraint current; acquiring a differential current and a restraint current according to the transient differential current and the transient restraint current; and achieving differential protection according to the differential current and the restraint current. The embodiments of the present invention further disclose a relay protection device correspondingly.
First claim
Opening claim text (preview).
What is claimed is: 1. A current source converter differential protection method, wherein the method comprises: sampling, by a relay protection device, secondary side currents of current transformers on two sides of a protected current source converter, to obtain incomer-side three-phase currents i Na , i Nb and i Nc , and outgoer-side three-phase currents i Ma , i Mb and i Mc ; rectifying the incomer-side three-phase currents and the outgoer-side three-phase currents, to obtain an incomer-side input current i N and an outgoer-side output current i M which are equivalent; converting the incomer-side input current and the outgoer-side output current according to a current ratio of the current transformers on the two sides, to acquire a transient differential current i diff and a transient restraint current i res ; acquiring a differential current i diff and a restraint current I res according to the transient differential current and the transient restraint current; and achieving differential protection according to the differential current i diff and the restraint current I res . 2. The current source converter differential protection method according to claim 1 , wherein the rectifying the incomer-side three-phase currents and the outgoer-side three-phase currents, to obtain an incomer-side input current i N and an outgoer-side output current i M which are equivalent comprises: using hardware rectification, and using a hardware three-phase rectifier bridge inside the relay protection device, to obtain the rectified incomer-side input current i N and outgoer-side output current i M which are equivalent. 3. The current source converter differential protection method according to claim 1 , wherein the acquiring a differential current i diff and a restraint current I res according to the transient differential current and the transient restraint current comprises: acquiring the transient differential current according to { i diff + ( n ) = K 1 i N + ( n ) - K 2 i M + ( n ) i diff - ( n ) = K 1 i N - ( n ) - K 2 i M - ( n ) i diff ( n ) = K 1 i N ( n ) - K 2 i M
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Classifications
for AC-AC converters · CPC title
involving current comparison · CPC title
involving comparison of quantities derived from a plurality of phases, e.g. homopolar quantities; using mixing transformers · CPC title
by static converters · CPC title
- H02M1/32Primary
Means for protecting converters other than automatic disconnection · CPC title
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- What does patent US9584007B2 cover?
- Embodiments of the present invention disclose a current source converter differential protection method, including: sampling, by a relay protection device, secondary side currents of current transformers on two sides of a protected current source converter, to obtain incomer-side three-phase currents, and outgoer-side three-phase currents; rectifying the incomer-side three-phase currents and th…
- Who is the assignee on this patent?
- Nr Electric Co Ltd, Nr Engineering Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H02M1/32. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Feb 28 2017 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).