DE112017002400T5 - NEW COUPLING POWER SUPPLY FAULT CURRENT LIMITER - Google Patents

Abstract

A coupling power supply fault current limiter comprising an iron core (100) and a plurality of coils (200). The iron core comprises a plurality of iron core posts (101) connected in parallel. The plurality of coils include at least one AC coil (201) and a DC coil (202). At least one AC coil is wound around each of the plurality of iron core posts. The DC coil is wound simultaneously around the multiple iron core posts. Two or more iron core posts wound around the at least one AC coil are connected in parallel, and the parallel-connected AC coils are connected in series with an AC power transmission loop (300). The DC coil wound simultaneously around the plurality of iron core posts is connected in series with a DC excitation power supply system (400). The current limiter has a low impedance in a normal running state and a high impedance in a short circuit fault state; the switching between high impedance and low impedance can be implemented quickly, and the excessively high short-circuit current in a power supply system is effectively limited.

Description

The present application claims the priority of Chinese Patent Application No. 201610316738.8 entitled "NOVEL COUPLING POWER FAULT CURRENT LIMITER" filed on 12 May 2016 with the Chinese Patent Office, which is hereby incorporated by reference in its entirety.

TECHNICAL AREA

The present disclosure relates to a current limiting device which is applied when a power line fault occurs, and more particularly to a new coupling power supply fault current limiter.

BACKGROUND

With the rapid development of power systems, a short-circuit capacity of the power system is increasingly high, and the maximum short-circuit current exceeds even the maximum interruption capacity of a circuit breaker. A gradual increase in a short-circuit current value further improves short-circuit tolerance requirements of transmission and transformation devices.

Therefore, at present, a problem of how to avoid an excessively large short-circuit current in the power supply system is urgently needed to be solved.

SUMMARY

In this regard, a new coupling power supply fault current limiter according to the present disclosure is provided to avoid excessively high short-circuit current in a power supply system. The technical solution is as follows.

In accordance with the disclosure, a new coupling power supply fault current limiter is provided that includes a core and a plurality of coils. The core comprises several parallel core columns. The multiple coils include one or more AC coils and a DC coil. At least one AC coil is wound around each of the plurality of core columns. A DC coil is wound around the several core columns. Two or more core columns, around each of which at least one AC coil is wound, are connected in parallel, and the parallel-connected AC coils are connected in series with an AC power transmission circuit. The one DC coil wound around the plural core columns is connected in series with a DC excitation power supply system.

Preferably, an AC coil is wound around each of the plurality of core columns and a DC coil is wound around the plurality of core columns.

Preferably, two AC coils are wound around each of the plurality of core columns, and a DC coil is wound around the plurality of core columns.

Preferably, the two AC coils wound around each of the core columns are connected in an intersecting manner.

In a case that at least two AC coils are wound around each of the plural core columns, preferably cross-connection points where the at least two AC coils are connected in an intersecting manner to each of the core columns are connected to lead terminals of the DC coil to form a loop.

In the above technical solution of the present disclosure, the new coupling power supply fault current limiter according to the present disclosure includes a core and a plurality of coils. The core comprises several parallel core columns. The multiple coils include one or more AC coils and a DC coil. At least one AC coil is wound around each of the plurality of core columns, and a DC coil is wound around the plurality of core columns. Two or more core columns, around each of which at least one AC coil is wound, are connected in parallel and the parallel-connected AC coils are connected in series with an AC power transmission circuit. The one DC coil wound around the plural core columns is connected in series with a DC excitation power supply system. The new coupling power supply fault current limiter provided in the present disclosure therefore employs a new coupling structure. That is, the AC coils are connected in parallel. When the AC coil wound around one of the core columns fails, the AC coil wound around another core column can continuously operate in the network. When the power grid system is in a normal operating state, the DC current flows through the DC coil and the DC coil does not participate in the power grid operation. When a short circuit fault occurs in the power supply system, the DC coil can be used as a current limiting reactor and automatically connected to the power supply system in a positive half cycle and a negative half cycle of the short circuit current to improve the limitation of the short circuit current. Therefore, with the present disclosure, requirements for a low impedance under the normal operating state and a high impedance in the case of a short circuit fault can be satisfied, thereby achieving fast switching between high impedance and low impedance and effectively avoiding an excessively large short circuit current in the power supply system.

list of figures

• 1 ist eine schematische Strukturdarstellung eines neuen Kopplungs-Energieversorgungs-Fehlerstrombegrenzers gemäß der vorliegenden Offenbarung;
• 2 ist eine schematische Strukturdarstellung eines anderen neuen Kopplungs-Energieversorgungs-Fehlerstrombegrenzers gemäß der vorliegenden Offenbarung; und
• 3 ist eine schematische Strukturdarstellung eines anderen neuen Kopplungs-Energieversorgungs-Fehlerstrombegrenzers gemäß der vorliegenden Offenbarung.

In order to more clearly illustrate technical solutions of the embodiments of the present disclosure or the conventional technology, the drawings needed in the description of the embodiments or the conventional technology will be briefly described below. The drawings obviously show only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art based on the drawings provided herein without any creative work.

• 1 FIG. 12 is a schematic structural diagram of a new coupling power supply fault current limiter according to the present disclosure; FIG.
• 2 FIG. 13 is a schematic structural diagram of another new coupling power supply fault current limiter according to the present disclosure; FIG. and
• 3 FIG. 12 is a schematic structural diagram of another new coupling power supply fault current limiter in accordance with the present disclosure. FIG.

DETAILED DESCRIPTION

Hereinafter, the technical solutions according to the embodiments of the present disclosure will be clearly and completely described in conjunction with the drawings of the embodiments of the present disclosure. The described embodiments are obviously not all embodiments of the present disclosure, but only a few. Any other embodiments obtained by those skilled in the art based on the embodiments of the present disclosure without any creative work are within the scope of the disclosure.

According to the disclosure, a new coupling power supply fault current limiter is provided, which is a core 100 and several coils 200 includes. The core 100 is implemented in a multi-column type and includes several parallel core columns 101 , The multiple coils 200 include one or more AC coils 201 and a DC coil 202 , Around each of the several core columns 101 is at least one AC coil 201 wound. Around the several core columns 101 is a DC coil 202 wound.

Two or more core columns 101 to each at least one AC coil 201 is wound, are connected in parallel. The parallel-connected AC coils 201 are with an AC power transmission circuit 300 connected in series.

The one around the several core columns 101 wound DC coil 202 is with a DC excitation power supply system 400 connected in series.

The inventor can exemplify the technical solution of the present disclosure.

First embodiment

In the embodiment, around each of the core columns 101 an AC coil 201 wrapped and around the several core columns 101 is a DC coil 202 wound. For the sake of illustration, as in 1 shown a case taken as an example in which the core has two core columns 101 comprises a first AC coil L1 around a first core column 1011 is wound and a second AC coil L2 around a second core column 1012 is wound. The first AC coil L1 and the second AC coil L2 are wound in opposite directions. To both the first core column 1011 as well as the second core column 1012 is a DC coil L wound.

In the embodiment, the first core column 1011 and the second core column 1012 connected in parallel. The first AC coil L1 around the first pillar 1011 is wound, and the second AC coil L2 around the second core column 1012 is wound, are therefore also connected in parallel. The parallel first AC coil L1 and second AC coil L2 are via lead terminals A and X of the parallel-connected first AC coil L1 and second AC coil L2 with an AC power transmission circuit 300 connected in series.

The lead terminals a and x of the DC coil L are connected to a DC excitation power supply system 400 connected in series.

In the embodiment, in the present disclosure, the first AC coil becomes L1 and the second AC coil L2 applied. That is, the two AC coils are connected in parallel. In the present disclosure, when the power grid system is in a normal operating condition, the DC current flows through the DC coil L and the DC coil does not participate in the power grid operation. When a fault occurs in the power grid system, for example, around a core column 101 wound AC coil 201 fails, the DC coil L can be used as a current limiting reactor to improve limitation on the short-circuit current. At the same time it can be around another core column 101 wound AC coil 201 work continuously in the network, thereby ensuring the normal operation of the power grid.

Second embodiment

2 FIG. 12 is a schematic structural diagram of another new coupling power supply fault current limiter in accordance with the present disclosure. FIG. In the embodiment, around each of the plurality of core columns 101 two AC coils 201 wrapped and around the several core columns 101 is a DC coil 202 wound.

Specifically, the case is still taken as an example that the core is two core columns 101 includes. A first AC coil L1 and a second AC coil L2 are around a first core column 1011 wound. A third AC coil L3 and a fourth AC coil L4 are around the second core column 1012 wound. The first AC coil L1 and the second AC coil L2 are connected in an overlapping way. The third AC coil L3 and the fourth AC coil L4 are connected in an overlapping way. It should be noted that in the embodiment, two AC coils 201 around each of the two core columns 101 are first connected in an overlapping manner, then the two AC coils 201 around the one core pillar 101 are wound, and the two AC coils 201 around the other core pillar 101 are wound, are connected in parallel.

In the embodiment, the first AC coil L1 and the third AC coil L3 wound in opposite directions, the second AC coil L2 and the fourth AC coil L4 are wound in opposite directions and the first AC coil L1 and the fourth AC coil L4 are wound in opposite directions. The DC coil L is both around the first core column 1011 as well as the second core column 1012 wound.

In the embodiment, the first core column 1011 and the second core column 1012 connected in parallel. The first AC coil L1 and the second AC coil L2 around the first pillar 1011 are connected in an overlapping manner. The third AC coil L3 and the fourth AC coil L4 around the second core column 1012 are connected in an overlapping manner. The AC coils 201 around the first pillar 1011 are wound with the AC coils 201 around the second core column 1012 are wound, connected in parallel. The parallel-connected AC coils are connected via the lead terminals A and X of the parallel-connected AC coils to the AC power transmission circuit 300 connected in series.

The pipe connections a and x the DC coil L are with the DC excitation power system 400 connected in series.

In the embodiment, the AC coils 201 around every core column 101 are first connected in series in an intersecting manner, and then the multiple AC coils wound around each of the plurality of core columns are connected in parallel. In the present disclosure, when the power grid system is in a normal operating condition, the DC current flows through the DC coil L , and the DC coil does not participate in the power grid operation. When a fault occurs in the power grid system, for example, around a core column 101 wound AC coil 201 fails, the DC coil can L be used as a current limiting reactor to improve limitation on the short circuit current. At the same time it can be around another core column 101 wound AC coil 201 work continuously in the network, thereby ensuring the normal operation of the power grid.

Third embodiment

3 FIG. 12 is a schematic structural diagram of another new coupling power supply fault current limiter in accordance with the present disclosure. FIG. The embodiment can be illustrated on the basis of the second embodiment.

In a case that at least two AC coils 201 around each of the core columns 101 are wrapped, for example, are in this Embodiment two AC coils 201 around each of the core columns 101 Wrapped are cross connection points where the at least two AC coils 201 in an overlapping manner at each of the core columns 101 are connected to line terminals of the DC coil 202 connected to form a loop.

Specifically, in this embodiment, the case is still taken as an example that the core has two core columns 101 includes. A first AC coil L1 and a second AC coil L2 are around a first core column 1011 wound. A third AC coil L3 and a fourth AC coil L4 are around the second core column 1012 wound. The first AC coil L1 and the second AC coil L2 are connected in an overlapping way. The third AC coil L3 and the fourth AC coil L4 are connected in an overlapping way. Similarly, in the embodiment, two alternating current coils 201 around each of the two core columns 101 first connected in an overlapping manner, then become the two AC coils 201 around the one core pillar 101 are wound, and the two AC coils 201 around the other core pillar 101 are wound, connected in parallel.

In the embodiment, the first AC coil L1 and the third AC coil L3 wound in opposite directions, the second AC coil L2 and the fourth AC coil L4 are wound in opposite directions and the first AC coil L1 and the fourth AC coil L4 are wound in opposite directions. The DC coil L is both the first core pillar 1011 as well as the second core column 1012 wound.

In the embodiment, the first core column 1011 and the second core column 1012 connected in parallel. The first AC coil L1 and the second AC coil L2 around the first pillar 1011 are connected in an overlapping manner. The third AC coil L3 and the fourth AC coil L4 around the second core column 1012 are connected in an overlapping manner. The AC coils 201 around the first pillar 1011 are wound with the AC coils 201 around the second core column 1012 are wound, connected in parallel. The parallel-connected AC coils are connected via the lead terminals A and X of the parallel-connected AC coils to the AC power transmission circuit 300 connected in series.

The lead terminals a and x of the DC coil L are with cross connection points K1 and K2 connected, where the two AC coils in an overlapping manner at each of the core columns 101 connected to form a loop.

In the embodiment, the AC coils 201 around every core column 101 are first connected in series in an intersecting manner, and then the multiple AC coils wound around each of the plurality of core columns are connected in parallel. In the present disclosure, when the power grid system is in a normal operating condition, the DC current flows through the DC coil L and the DC coil does not participate in the power system operation. When a fault occurs in the power grid system, for example, the AC coil 201 around a core pillar 101 is wound, fails, can the DC coil L be used as a current limiting reactor to improve limitation on the short circuit current. At the same time it can be around another core column 101 wound AC coil 201 work continuously in the network, thereby ensuring the normal operation of the power grid.

Therefore, with the above technical solution of the present disclosure, the new coupling power supply fault current limiter provided in the present disclosure can meet the requirements of a low impedance under the normal operating state and a high impedance in a case of a short circuit fault, thereby rapidly changing high impedance and to achieve low impedance, thereby meeting power system reclosing requirements, and effectively avoiding excessively high short-circuit current in the power supply system.

In addition, in the present disclosure, a connection mode of a plurality of AC coils 201 around every core column 101 are wound, and a connection mode of multiple AC coils 201 around the several core columns 101 are flexibly selected based on various current-limiting impedance requirements of the power system. A response of the new coupling power supply fault current limiter to the short-circuit current according to the present disclosure is a passive response without external intervention, and a response time is close to zero.

It should further be noted that the relationship terminologies such as "first" / "first" / "first", "second" / "second" / "second" and the like are only used herein to describe an entity or process from another / to another and not to require or imply that the actual relationship or order exists between the entities or operations. In addition, the terms "comprising,""including," or any other variations thereof are intended to include a non-exclusive inclusion so that processes, methods, articles, or devices that include a number of elements include not only these elements, but also those not explicitly listed or other elements inherent in such processes, procedures, articles or devices. Unless expressly limited, the statement "comprising a ..." / "comprising a ..." / "comprising a ..." does not exclude the case that other similar elements in the process, the method, the Article or the device may be present except the enumerated elements.

The new coupling power supply fault current limiter according to the present disclosure is introduced in detail above. The principle and the embodiments of the present disclosure are described by specific examples in the specification. The above description of embodiments is only intended to aid in understanding the method and core concepts of the present disclosure. As will be apparent to those skilled in the art, modifications may be made to the specific embodiments and scope of application based on the concept of the present disclosure as above, and the description should not be construed to limit the present disclosure.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• CN 201610316738 [0001]

Claims (5)

A new coupling power supply fault current limiter, comprising: a core and a plurality of coils, the core comprising a plurality of core columns connected in parallel, the plurality of coils comprising one or more AC coils and a DC coil; around each of the plurality of core columns, at least one AC coil is wound around which a plurality of core columns a DC coil is wound; two or more core columns, around each of which at least one AC coil is wound, are connected in parallel and the parallel-connected AC coils are connected in series with an AC power transmission circuit; and the one DC coil wound around the plurality of core columns is connected in series with a DC excitation power supply system. New coupling power supply fault current limiter after Claim 1 wherein an AC coil is wound around each of the plurality of core columns, and a DC coil is wound around the plurality of core columns. New coupling power supply fault current limiter after Claim 1 wherein two AC coils are wound around each of the plurality of core columns, and a DC coil is wound around the plurality of core columns. New coupling power supply fault current limiter after Claim 3 wherein the two AC coils wound around each of the core columns are connected in an intersecting manner. New coupling power supply fault current limiter after Claim 1 . 3 or 4 wherein, in a case that at least two AC coils are wound around each of the plurality of core columns, cross-connection points where the at least two AC coils are connected in an overlapping manner to each of the core columns are connected to lead terminals of the DC coil to form a loop.

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