CN102184765A

CN102184765A - Saturable reactor

Info

Publication number: CN102184765A
Application number: CN 201110040954
Authority: CN
Inventors: 李晓明
Original assignee: Shandong University
Current assignee: Shandong University
Priority date: 2011-02-21
Filing date: 2011-02-21
Publication date: 2011-09-14
Anticipated expiration: 2031-02-21
Also published as: CN102184765B

Abstract

The invention relates to a saturable reactor with better performance that can reduce the reactance value of the saturable reactor in a saturated state. It includes: a saturable reactor core; at least one reactance coil and a plurality of DC coils are respectively installed on one side of the saturable reactor core, and a corresponding position corresponding to the saturable reactor core is respectively provided with a The above-mentioned reactance coil and DC coil structure, another reactance coil and another DC coil with the same number of turns constitute a reactance coil pair and a DC coil pair; wherein, the two ends of a reactance coil pair with the same name are respectively used as a saturated reactor AC circuit The AC terminal I and AC terminal II of the AC terminal are connected to each other; each pair of DC coils is centered, and one of the same-named terminals of a pair of DC coils is connected to a different-named terminal, and the remaining same-named terminals and different-named terminals are located as DC terminal I and DC terminal II; two terminals with the same name and two terminals with different names in the remaining pairs of DC coils are respectively connected.

Description

A kind of saturable reactor

Technical field

The present invention relates to electric power system and send the power transformation field, particularly a kind of saturable reactor of more dominance energy.

Background technology

Along with the continuous development of electric power system, the continuous rising of generate output, the electric power system short circuit current that causes that is short-circuited is very big.The be short-circuited short circuit current that causes of electric power system is very big to the harm of electric power system.Reduce short circuit current, can make the circuit breaker can cutting-off of short-circuit electric current, reduce the extent of damage of power equipment when short circuit, improve the stability of electric power system.

The method and apparatus of Recent study limiting short-circuit current (also claiming demand limiter) becomes heat subject.

Utilize the saturation characteristic of saturable reactor iron core to constitute demand limiter.Increase by one group of dc coil on the saturable reactor iron core, when electric power system normally moved, DC power supply provided direct current to dc coil, made the iron core degree of depth of saturable reactor saturated.When the iron core degree of depth of saturable reactor was saturated, saturable reactor presented little reactance; The demand limiter that is connected in the transmission line does not influence normal transmission of electricity.When electric power system was short-circuited, control module was cut off the direct current of dc coil, and the iron core of saturable reactor breaks away from saturated; Saturable reactor presents very big reactance.The saturable reactor that is connected in the transmission line provides constraints to short circuit current, reduces short circuit current.

" a kind of saturable reactor short-circuit current limiting device " of the patent No. 2008101604501 and " short-circuit current limiting device and the method " of the patent No. 2008101592788 are one of achievements in research of this respect.Saturable reactor is the nucleus equipment of saturation reactance type demand limiter, also is the most valuable equipment, and its characteristic directly influences the performance index of demand limiter.Patent of invention number is: 2010105840411 " a kind of magnetic saturation reactor " proposed a kind ofly satisfying the volume and the weight that can reduce saturable reactor under the performance requirement condition; Under the magnetic saturation state, can reduce a kind of saturable reactor of the reactance value of saturable reactor.The performance that further improves saturable reactor remains the target of pursuit.

Summary of the invention

Purpose of the present invention is exactly in order to address the above problem, and under the magnetic saturation state, further reduces the reactance value of saturable reactor; And antijamming capability is strong.

For achieving the above object, the present invention adopts following technical scheme:

A kind of saturable reactor, it comprises:

A saturable reactor iron core; Described saturable reactor iron core one side is installed at least one reactance coil and a plurality of dc coil respectively, saturable reactor iron core opposite side correspondence position symmetry be respectively equipped with one with described reactance coil and dc coil structure, another reactance coil and another dc coil that the number of turn is identical, thereby constitute reactance coil to right with dc coil; Wherein, two right end of the same name of reactance coil are respectively ac terminal I and the ac terminal II as the saturable reactor ac circuit, and their two different name ends link to each other;

Each is to dc coil centering, and wherein a pair of dc coil end of the same name is connected with a different name end, and remaining end of the same name and different name are sat up straight and be dc terminal I and dc terminal II; Remaining each links to each other respectively with two different name ends to two ends of the same name in the dc coil.

A kind of saturable reactor, it comprises:

A saturable reactor iron core; Saturable reactor iron core one side is installed reactance coil L1, dc coil L2, dc coil L5 respectively; Saturable reactor iron core opposite side is installed reactance coil L3, dc coil L4, dc coil L6 respectively; Reactance coil L1 and reactance coil L3 structure, the number of turn are identical; Dc coil L2 and dc coil L4 structure, the number of turn are identical; Dc coil L5 and dc coil L6 structure, the number of turn are identical;

The end of the same name of reactance coil L1 is one of them ac terminal I of saturable reactor ac circuit, and the different name end of reactance coil L1 is connected with the different name end of reactance coil L3, and the end of the same name of reactance coil L3 is another ac terminal II of saturable reactor ac circuit;

The end of the same name of dc coil L2 is connected with the different name end of dc coil L4, and the different name end of dc coil L2 is one of them dc terminal I of saturable reactor DC loop, and the end of the same name of dc coil L4 is another dc terminal II of saturable reactor DC loop;

The end of the same name of dc coil L5 is connected with the different name end of dc coil L6, and the different name end of dc coil L5 is connected with the end of the same name of dc coil L6.

Described saturable reactor iron core is a day font structure; The sectional area of both sides iron core equates; The sectional area of middle iron core equals the sectional area sum of both sides iron core.

The invention provides and be provided under the magnetic saturation state a kind of saturable reactor structure and the connected mode of the reactance value of reduction saturable reactor.

The invention has the beneficial effects as follows: under the magnetic saturation state, the reactance value of saturable reactor is lower.Saturable reactor of the present invention is used for demand limiter, electric power system normally when operation, reduces 6% than the reactance value of " a kind of magnetic saturation reactor " of patent of invention numbers 2010105840411.Reduced the interference of ac circuit, protected the power electronic device in the DC circuit DC loop.

Description of drawings

Fig. 1 represents saturable reactor structure and connected mode;

Wherein, 1. ac terminal I, 2. ac terminal II, 3. dc terminal I, 4. dc terminal II, 5. saturable reactor iron core.

Embodiment

The present invention will be further described below in conjunction with accompanying drawing.

Saturable reactor structure and connected mode are as shown in Figure 1.Device ac terminal I1 and ac terminal II2 polyphone incoming transport transmitting loop; Device dc terminal I3 and dc terminal II4 polyphone insert direct current power supply loop.

Because the end of the same name of reactance coil L1 is the ac terminal I1 of saturable reactor ac circuit, the different name end of reactance coil L1 is connected with the different name end of reactance coil L3, and the end of the same name of reactance coil L3 is the ac terminal II of saturable reactor ac circuit; Again because reactance coil L1 and reactance coil L3 structure, the number of turn, winding method technological requirement are identical; So, the magnetic flux Φ 2 that the alternating current that magnetic flux Φ 1 and the reactance coil L2 that the alternating current that flows through at reactance coil L1 produces in iron core flows through produces in iron core, equal and opposite in direction, direction all makes progress, exchange flux respectively day type structure both sides iron core upwards, all pass through the middle iron core formation closed-loop path of day font structure.If the dc coil L2 of saturable reactor, dc coil L4 direct current are zero; The saturable reactor iron core breaks away from saturation condition, and the reactance that is connected on reactance coil L1, reactance coil L3 in the transmitting loop is very big.Described saturable reactor iron core 5 is a day font structure; The sectional area of both sides iron core equates; The sectional area of middle iron core equals the sectional area sum of both sides iron core.

The end of the same name of dc coil L2 is connected with the different name end of dc coil L4, and the different name end of dc coil L2 is one of them dc terminal I3 of saturable reactor DC loop, and the end of the same name of dc coil L4 is the dc terminal II4 of saturable reactor DC loop.Reactance coil L1 produces the power frequency magnetic flux in the saturable reactor iron core, this power frequency magnetic flux produces induced electromotive force at dc coil L2; Reactance coil L3 produces the power frequency magnetic flux in the saturable reactor iron core, this power frequency magnetic flux produces induced electromotive force at dc coil L4; Because dc coil L2 is identical with the technological requirement of dc coil L4 structure, the number of turn, winding method, the power frequency induced electromotive force of dc coil L2 is kept to zero mutually with the power frequency induced electromotive force of dc coil L4, and the alternating current of reactance coil L1, reactance coil L3 does not exert an influence to DC loop.

When flowing through direct current among dc coil L3, the L4, upwards one downwards for one of the magnetic flux that dc coil L3, L4 produce, and direct current flux forms the magnetic flux closed loop at the both sides iron core; The direct current flux path is shorter than present already used twoport font structure saturable reactor exchange flux path, and core sataration is dark, and is big to the AC coil influence.So when direct current flux made the place core sataration, the iron core column at AC coil place also was saturated simultaneously.The saturable reactor iron core is in saturation condition, and the reactance that is connected on reactance coil L1, reactance coil L3 in the transmitting loop is very little.

Each AC coil of saturable reactor is wound on the identical iron core column with the dc coil level, has strengthened the magnetic coupling of AC coil and dc coil.

The end of the same name of dc coil L5 is connected with the different name end of dc coil L6, and the different name end of dc coil L5 is connected with the end of the same name of dc coil L6.Reactance coil L1 produces the power frequency magnetic flux in the saturable reactor iron core, this power frequency magnetic flux produces induced electromotive force at dc coil L5; Reactance coil L3 produces the power frequency magnetic flux in the saturable reactor iron core, this power frequency magnetic flux produces induced electromotive force at dc coil L6; Because dc coil L5 is identical with the technological requirement of dc coil L6 structure, the number of turn, winding method, the power frequency induced electromotive force of dc coil L5 is kept to zero mutually with the power frequency induced electromotive force of dc coil L6, does not have electric current to flow among dc coil L5 and the dc coil L6.If between dc terminal I3 and the dc terminal II4 interference alternating voltage is arranged, the power frequency induced electromotive force of dc coil L5 and the power frequency induced electromotive force of dc coil L6 subtract each other non-vanishing, there is electric current to flow among dc coil L5 and the dc coil L6, forces the interference alternating voltage between dc terminal I3 and the dc terminal II4 to descend.Reduced the harm of interference voltage to DC circuit.

Saturable reactor of the present invention can manufacture and design with prior art, can realize fully.Broad prospect of application is arranged.

Claims

1. A saturable reactor, characterized in that it comprises:

A saturable reactor core; at least one reactance coil and a plurality of DC coils are respectively installed on one side of the saturable reactor core, and a corresponding position corresponding to the saturable reactor core is respectively provided with a Another reactance coil and another DC coil with the same structure and number of turns as the DC coil form a reactance coil pair and a DC coil pair; among them, the two terminals with the same name of a reactance coil pair are respectively the AC terminals of the AC circuit of the saturated reactor I and AC terminal II, their two opposite ends are connected;

Each pair of DC coils is centered, one of the same-named ends of one pair of DC coils is connected to a different-named end, and the remaining same-named and different-named ends are located as DC terminal I and DC terminal II; the two same-named terminals in the remaining pairs of DC coils The end is connected to the two opposite ends respectively.

2. The saturable reactor according to claim 1, characterized in that it comprises:

A saturable reactor core; one side of the saturable reactor core is respectively equipped with reactance coil L1, DC coil L2, and DC coil L5; the other side of the saturable reactor core is respectively equipped with reactance coil L3, DC coil L4, and DC coil L6; Reactance coil L1 has the same structure and number of turns as reactance coil L3; DC coil L2 has the same structure and number of turns as DC coil L4; DC coil L5 has the same structure and number of turns as DC coil L6;

The end with the same name of the reactance coil L1 is one of the AC terminals I of the AC circuit of the saturated reactor, the opposite end of the reactance coil L1 is connected with the opposite end of the reactance coil L3, and the end of the same name of the reactance coil L3 is the other end of the AC circuit of the saturated reactor One AC terminal II;

The same-named end of the DC coil L2 is connected to the different-named end of the DC coil L4. The different-named end of the DC coil L2 is one of the DC terminals I of the DC circuit of the saturable reactor, and the same-named end of the DC coil L4 is the other of the DC circuit of the saturable reactor. a DC terminal II;

The same-named end of the DC coil L5 is connected to the different-named end of the DC coil L6, and the different-named end of the DC coil L5 is connected to the same-named end of the DC coil L6.

3. The saturated reactor according to claim 1 or 2, characterized in that, the iron core of the saturated reactor is a Japanese-shaped structure; the cross-sectional areas of the iron cores on both sides are equal; the cross-sectional areas of the middle iron core are equal to the two sides The sum of the cross-sectional areas of the core.