CN202206132U - Magnetic control type fault current limiter - Google Patents
Magnetic control type fault current limiter Download PDFInfo
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- CN202206132U CN202206132U CN2011203200054U CN201120320005U CN202206132U CN 202206132 U CN202206132 U CN 202206132U CN 2011203200054 U CN2011203200054 U CN 2011203200054U CN 201120320005 U CN201120320005 U CN 201120320005U CN 202206132 U CN202206132 U CN 202206132U
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Abstract
A magnetic control type fault current limiter utilizes the characteristic of adjustable reactance of a magnetic control reactor and adjusts reactance value at the right moment along with the variation of system current. When a system has short circuit fault, high impedance can be presented instantly, thereby avoiding increase of short circuit current and enabling the short circuit current to be limited in a degree acceptable to a power grid. The magnetic control type fault current limiter is formed by a three-phase magnetically controlled reactor, an air reactor, a direct current excitation unit and an automatic control unit. The input end and the output end of the three-phase magnetically controlled reactor are in series connection with the power grid, a leading-out terminal of the three-phase magnetically controlled reactor is in series connection with the air reactor which is in series connection with the direct current excitation unit, and the direct current excitation unit is in parallel connection with the automatic control unit. The magnetic control type fault current limiter has the advantages of being large in capacity, simple in structure, high in reliability, low in cost and the like, can meet technical requirements for current limit of the system, is easy in high voltage and large capacity, and is hopeful to be widely used in a power system.
Description
Technical field
The utility model relates to a kind of transmission and distribution network short-circuit fault current limiter, relates to a kind of magnet controlled fault current limiter that is applied to the electrical power trans mission/distribution system limiting short-circuit current specifically.
Background technology
Along with the continuous development of China's electric power system, the expansion day by day and the interconnected degree of electrical network of transmission and distribution network scale and capacity are increasingly high, and the failed shorted levels of current of electrical network also constantly rises.In order to reduce the harm that short circuit current causes electric power system, must take the short circuit current of corresponding measure restriction electric power system.Generally can be from the adjustment electric network composition, change system operation mode and install aspect such as current limiter additional and consider limiting short-circuit current.China's short-circuit fault of power system current limiter generally is divided into two big types: the one, and power electronics type fault current limiter, it is to adopt power electronic device as power device, has advantages such as quick action, control precision height, permission frequent operation.But, make that the reliability of flow restricter is not high owing to receive the influence of power electronic device fragility.The 2nd, the new material fault current limiter mainly is meant the superconduct fault current limiter.This fault current limiter utilizes the conversion characteristic of superconductor between superconducting state and normal state, produces a suitable resistance in the line and comes fault current limiting.When circuit normally moved, flow restricter showed as zero impedance or minimum impedance, passes through rated current almost losslessly; When the circuit failed because, superconductor reacts rapidly in several milliseconds and presents non-linear high-ohmic, thus limiting short-circuit current.The deficiency of superconductive current limiter is to cost an arm and a leg, and is difficult to widespread adoption.
Summary of the invention
According to the problem that existing fault current limiter exists, it is a kind of simple in structure that the utility model provides, and response speed is fast, and reliability is high, and function admirable can satisfy the specification requirement of system's current limliting and be easy to the magnet controlled fault current limiter of high-voltage large-capacityization.
Addressing the above problem the technical measures of being taked is:
A kind of magnet controlled fault current limiter; It is characterized in that: constitute by three-phase magnet controlled reactor 9, air core reactor 6, DC excitation unit 7 and automatic control unit 8; Wherein: three-phase magnet controlled reactor 9 constitutes double-iron core three-phase and five-pole iron core by two identical preceding iron core I with back iron core II; Three posts in the middle of the three-phase and five-pole iron core are principal post 1; Principal post 1 has the cross section 5 that differs in size; Two side columns of three-phase and five-pole iron core both sides are return yoke 2; Before iron core I and back iron core II respectively by be arranged on separately three principal posts 1 about the horizontal yoke 3 of three iron cores at yoke place is connected, by the winding 4 of electromagnetic wire coiling be set in preceding iron core I and after on iron core II three principal posts 1 separately, the winding 4 on each principal post 1 is made up of the identical in structure two sections; Before after the upper end interconnection of lower end and the corresponding hypomere winding mutually of back iron core II of the every phase epimere of iron core I winding and after the upper end interconnection of the lower end of the every phase epimere of back iron core II winding and preceding iron core I correspondence hypomere winding mutually by terminal AK, AD; BK, BD and CK, CD draw, the top and bottom of two windings 4 of homophase three-phase input end A, B, C and the output Xa, Xb, the Xc that are connected in parallel respectively and have formed three-phase magnet controlled reactor 9 mutually on iron core I and the back iron core II before being sleeved on, and itself and electrical network are in series; Be sleeved on leading-out terminal AK, the AD of winding on preceding iron core I and the back iron core II; Be in series with air core reactor 6 after BK, BD and CK, the CD interconnection, air core reactor 6 is in series with DC excitation unit 7, and DC excitation unit 7 is connected in parallel with automatic control unit 8.
The beneficial effect of the utility model is:
1, when electrical network normally moved, the utility model was Low ESR, did not influence the ability to transmit electricity of electrical network.
2, when the electrical network failed because, the instantaneous high impedance that is of the utility model, limiting short-circuit current significantly, whole current limliting process can be accomplished in 20 milliseconds.
3, the DC excitation unit of the utility model adopts optical fiber to connect, and has realized electric isolation effectively, has improved the fail safe of flow restricter.
4, in the utility model; Air core reactor is connected in the DC excitation loop, can increase impedance loop, and alternating current is to the impact of DC excitation unit when avoiding failed because; Help improving the response speed of the utility model, can protect energized circuit again.
5, because the utility model is simple in structure, response speed is fast, good reliability; Have very strong impact resistance, limiting short-circuit current is to improve voltage stability fast; Improve power supply quality, improve the novel current limiter of transmission of electricity fail safe and stability, be suitable for failing, the electric current restriction of distribution system, damped oscillation etc.; Can satisfy the specification requirement of system's current limliting, and be easy to high-voltage large-capacityization, be expected to be used widely in electric power system.
Description of drawings
Fig. 1 is the structural representation of the utility model;
Fig. 2 is the perspective view of iron core in the utility model;
Fig. 3 is the structural representation of three-phase magnet controlled reactor in the utility model;
Fig. 4 is the connection sketch map of winding in the utility model;
Fig. 5 is the circuit block diagram of automatic control unit in the utility model;
Fig. 6 is the control flow chart of automatic control unit in the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is done specific descriptions.
A kind of magnet controlled fault current limiter; Be based on the magnetic saturation principle work; It is characteristics of utilizing the magnet controlled reactor reactance adjustable, makes its system for tracking change in current, adjusts reactance value in good time; Its core component is a magnet controlled reactor, and its saturation depth can be according to the self-regulation that requires of operation of power networks parameter.When electrical network normally moved, magnet controlled reactor was in degree of depth saturation condition, and impedance is minimum, helped improving the power transmission efficiency of electrical network; And when the electrical network failed because, it is saturated that magnet controlled reactor can withdraw from the extremely short time, transmits high impedance, and the increase of limiting short-circuit current is limited in the acceptable degree with short circuit current.Like Fig. 1, Fig. 2 and shown in Figure 3; The utility model is made up of three-phase magnet controlled reactor 9, air core reactor 6, DC excitation unit 7 and automatic control unit 8; Wherein: three-phase magnet controlled reactor 9 constitutes double-iron core three-phase and five-pole iron core by two identical preceding iron core I with back iron core II; Three posts in the middle of the three-phase and five-pole iron core are principal post 1, and for satisfying the needs of three-phase magnet controlled reactor 9 operating characteristic, principal post 1 has the cross section 5 that differs in size; Two side columns of three-phase and five-pole iron core both sides are return yoke 2; Before iron core I and back iron core II respectively by be arranged on three principal posts about in the of 1 the horizontal yoke 3 of three iron cores at yoke place be connected; Winding 4 by the electromagnetic wire coiling is set on preceding iron core I and back iron core II three principal posts 1 separately; Winding 4 on each principal post 1 is made up of the identical in structure two sections, because preceding iron core I has 6 principal posts 1 with back iron core II, so have 12 by the identical winding 4 of electromagnetic wire coiling.Before after the upper end interconnection of lower end and the corresponding hypomere winding mutually of back iron core II of the every phase epimere of iron core I winding and after the upper end interconnection of the lower end of the every phase epimere of back iron core II winding and preceding iron core I correspondence hypomere winding mutually by terminal AK, AD; BK, BD and CK, CD draw; The top and bottom of two windings 4 of homophase three-phase input end A, B, C and the output Xa, Xb, the Xc that are connected in parallel respectively and have formed three-phase magnet controlled reactor 9 mutually on iron core I and the back iron core II before being sleeved on, itself and electrical network are in series; Three-phase magnet controlled reactor 9 is connected in the transmission line as the main body of magnetic control flow restricter, and its leading-out terminal is connected with air core reactor 6, and air core reactor 6 is in series with DC excitation unit 7.DC excitation unit 7 is made up of excitation transformer B and thyristor VD; The alternating voltage that is about 110V of excitation transformer B output is through thyristor VD phase control rectifier; Change interchange into controlled direct current; Be input to the excitation winding of three-phase magnet controlled reactor 9 again through air core reactor 6, for three-phase magnet controlled reactor 9 provides the DC excitation electric current.DC excitation unit 7 series connection air core reactors 6 be restriction system when breaking down alternating current to the impact of direct current system.Automatic control unit 8 is parallel operations with DC excitation unit 7, and the size of exciting current is decided by automatic control unit 8 fully.In the utility model, automatic control unit 8 adopts conventional electric current and voltage signal testing circuit, signal processing circuit, decision circuitry, trigger impulse form circuit, pulse blocking circuit, detection feedback and protective circuit as a result.Automatically control section adopts conventional embedded scm control and accurate A/D converter, have fast detecting, high-speed computation, by force anti-interference, protect characteristics such as perfect.In the present embodiment, the model that single-chip microcomputer adopts is PIC16F870.
Fig. 4 is the connection sketch map of winding in the utility model.By knowing that the leading-out terminal of A phase winding is respectively A among the figure
1～A
8The leading-out terminal of B phase winding is respectively B
1～B
8The leading-out terminal of C phase winding is respectively C
1～C
8For A phase: A
1, A
2Leading-out terminal after the connection is AK; A
3, A
4Leading-out terminal after the connection is AD; AK is the A input of DC control electric current mutually with AD; A
5With A
6Be in parallel A
7With A
8Be in parallel two terminal A of parallel connection back gained and X
a, be the preparation terminal that is connected with electrical network A.For B phase: B
1, B
2Leading-out terminal after the connection is BK; B
3, B
4Leading-out terminal after the connection is BD; BK is the B input of DC control electric current mutually with BD; B
5With B
6Be in parallel B
7With B
8Be in parallel two terminal B of parallel connection back gained and X
b, be the preparation terminal that is connected with electrical network B.For C phase: C
1, C
2Leading-out terminal after the connection is CK; C
3, C
4Leading-out terminal after the connection is CD; CK is the C input of DC control electric current mutually with CD; C
5With C
6Be in parallel C
7With C
8Be in parallel two terminal C of parallel connection back gained and X
c, be the preparation terminal that is connected with electrical network C.
Fig. 5 and Fig. 6 are respectively the circuit block diagram and the control flow chart of automatic control unit 8 in the utility model.Wherein: the system voltage signal U that high voltage potential transformer PT summation current transformer CT detects, I become digital signal after mould/number conversion circuit A/D conversion separately; Be input to and carry out computing in the singlechip CPU; If the result of computing meets normal service requirement, then form circuit and send trigger impulse, the thyristor VD conducting that is triggered by trigger impulse; Three-phase magnet controlled reactor 9 degree of depth are saturated, guarantee that power transmission and transformation system normally moves; If the result of CPU computing is a system short-circuit fault; Then block trigger impulse immediately, force thyristor VD to turn-off, make three-phase magnet controlled reactor 9 withdraw from the saturated high impedance status that appears rapidly; The increase of restriction system short circuit current is protected power transmission and transformation line and equipment.The effect one of protective circuit is the operating state of under normal operating condition, monitoring thyristor VD in real time, makes its reliably working, guarantees the reliable and stable operation of the utility model, reduces its failure rate; The 2nd, in case flow restricter lost efficacy, protective circuit can be moved immediately, with three-phase magnet controlled reactor 9 short circuits, it is withdrawed from automatically from electrical network, guarantees system's normal power supply.The utility model can be processed dry construction, also can be made into the oil immersion structure, and the oil immersion structure is on the dry construction basis, to add a protection fuel tank, and insulating oil is filled with in the inside, and lead-out wire is drawn by terminal again and is connected with automatic control unit 8 with DC excitation unit 7.
The operation principle of the utility model and the course of work are: in the AC Windings of the utility model, fed the direct current that can regulate, the size that changes direct current can be adjusted the saturation depth of flow restricter iron core.The direct current that is fed is big more, and iron core levels off to saturated more, and its reactance value is more little; Otherwise the direct current that is fed is more little, and iron core is more away from the saturation region, and its reactance value is big more.Control system collects the variable condition of power network current, after handling through control circuit, converts the signal source of control direct current size into; Under the control of this signal, the reactance value of the utility model gets final product the system for tracking change in current and changes, under the state of the normal operation of system; The direct current that the DC excitation unit adds is bigger, makes the iron core degree of depth saturated, and the reactance value of three-phase magnet controlled reactor becomes very little; Metering function very a little less than, help improving power transmission efficiency; When system's failed because, direct current moment of adding diminishes, and iron core withdraws from saturated fast, and the reactance value of three-phase magnet controlled reactor reaches the design maximum value, and short circuit current is limited, and plays the effect of current-limiting protection.
Claims (1)
1. magnet controlled fault current limiter; It is characterized in that: constitute by three-phase magnet controlled reactor (9), air core reactor (6), DC excitation unit (7) and automatic control unit (8); Wherein: three-phase magnet controlled reactor (9) constitutes double-iron core three-phase and five-pole iron core by two identical preceding iron core I with back iron core II; Three posts in the middle of the three-phase and five-pole iron core are principal post (1); Principal post (1) has the cross section (5) that differs in size; Two side columns of three-phase and five-pole iron core both sides are return yoke (2); Before iron core I and back iron core II respectively by be arranged on separately three principal posts (1) up and down three horizontal yokes of iron core (3) at yoke place be connected; Winding (4) by the electromagnetic wire coiling is set on preceding iron core I and back iron core II three principal posts (1) separately; Winding (4) on each principal post (1) is made up of the identical in structure two sections, and by terminal AK, AD, BK, BD and CK, CD draw after the upper end interconnection of the lower end of the every phase epimere of preceding iron core I winding and the corresponding hypomere winding mutually of back iron core II and after the upper end interconnection of the lower end of the every phase epimere of back iron core II winding and the corresponding hypomere winding mutually of preceding iron core I; Before being sleeved on iron core I and the back iron core II mutually the top and bottom of two windings (4) of homophase be connected in parallel respectively and formed three-phase input end A, B, C and output Xa, Xb, the Xc of three-phase magnet controlled reactor (9); Itself and electrical network are in series, and are sleeved on leading-out terminal AK, the AD of winding on preceding iron core I and the back iron core II, are in series with air core reactor (6) after BK, BD and CK, the CD interconnection; Air core reactor (6) is in series with DC excitation unit (7), and DC excitation unit (7) are connected in parallel with automatic control unit (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203200054U CN202206132U (en) | 2011-08-30 | 2011-08-30 | Magnetic control type fault current limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203200054U CN202206132U (en) | 2011-08-30 | 2011-08-30 | Magnetic control type fault current limiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202206132U true CN202206132U (en) | 2012-04-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203200054U Expired - Lifetime CN202206132U (en) | 2011-08-30 | 2011-08-30 | Magnetic control type fault current limiter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202206132U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324736A (en) * | 2011-08-30 | 2012-01-18 | 丹东欣泰电气股份有限公司 | Magnetron type fault current limiter |
-
2011
- 2011-08-30 CN CN2011203200054U patent/CN202206132U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324736A (en) * | 2011-08-30 | 2012-01-18 | 丹东欣泰电气股份有限公司 | Magnetron type fault current limiter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120425 |