CN102723704B - Magnetic switch type short-circuit current fault detection method and device for same - Google Patents
Magnetic switch type short-circuit current fault detection method and device for same Download PDFInfo
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Abstract
The invention relates to a short-circuit current fault detection method and a device for the same, in particular to a magnetic switch type short-circuit current fault detection method and a device for the same. During system operation, a voltage transformer PT and a current transformer CT detect voltage and current signals on a high-voltage bus and transmit the signals to a CPU (central processing unit) through an A/D (analog/digital) converter, and the CPU judges according to the detected voltage and current signals and sends corresponding signals to a direct-current bias current control circuit which controls a magnetic switch type short-circuit fault current limiter to control the current of the detected high-voltage bus. Therefore, the magnetic switch type short-circuit current fault detection method and the device for the same have the advantages that the device is simple in structure, quick in response speed, matched with a relay protection device, capable of quickly and effectively limiting system short-circuit current to meet the technical requirement on current limiting, and easy to be high-voltage and high-capacity to meet the development requirements of power systems.
Description
Technical field
The present invention relates to a kind of short circuit current fault detection method
And for the device of the method, especially relate to a kind of magnetic switch type short circuit current fault detection method and the device for the method.
Background technology
In recent years, along with China's economy grows continuously and fast, need for electricity amount constantly increases, and the scale of electric power system increases day by day.Because load and the load density in unit and station capacity, substation capacity, city and the center of industry constantly increase, and the formation of interconnected and large regional power grid between electric power system, cause the short circuit current level in modern power systems electrical networks at different levels constantly to increase, the short circuit current level of some areas has has met or exceeded the rupturing capacity of circuit breaker, and ascendant trend is more and more obvious, serious threat is to the safe operation of system.The limiting short-circuit current that takes appropriate measures is imperative.
In numerous short-circuit current limiting measures, fault current limiter Fault Current Limiter, FCL receives more and more people's concern with its superior combination property, wide application prospect, become one of failure current limit technical field focus.
Current fault current limiter both domestic and external can be divided into two classes by its working method: the one, based on the fault current limiter of " switching technique ", comprise the solid-state fault current limiter of GTO, mode of resonance fault current limiter, series compensation type fault current limiter, based on TPSC technology series resonance-type fault current limiter etc.This class fault current limiter, mainly using high-power electric and electronic switch as main bypass technology, be made the series and parallel that high voltage large capcity fault current limiter often needs multiple devices, and loss is large, involve great expense, reliability is also difficult to ensure.The 2nd, based on the uprush fault current limiter of characteristic of element, comprise superconduct fault current limiter, PTC fault current limiter etc.Fault current limiter, high-voltage and current-limitation fuse etc. that this class is got up based on new material, development of new techniques, owing to restricted by physical characteristics of materials, the lowest high-current value allowing is very limited, there is recovery time, and be subject to warming-up effect large, repeatedly Reusability, far can not meet the demand of electric power system high voltage large capcity.
Summary of the invention
The present invention solves the existing technical problem of prior art; A kind of simple in structure, fast response time is provided; match with protective relaying device; restriction system short circuit current fast and effectively; meet the technical requirement of current limliting; and be easy to high-voltage large-capacity, meet electric power system demand for development a kind of magnetic switch type short circuit current fault detection method and for the device of the method.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals:
A kind of magnetic switch type short circuit current fault detection method, it is characterized in that, concrete grammar is as follows: voltage transformer pt, Current Transmit are received on tested three-phase high-voltage bus, voltage transformer pt, Current Transmit are received on CPU control chip by A/D converter respectively, CPU control chip is connected with a magnetic switch type short-circuit fault current limiter by a DC bias current control circuit, and described magnetic switch type short-circuit fault current limiter is connected to each phase bus of three-phase high-voltage bus; When detection: voltage transformer pt, Current Transmit detect the voltage and current signal on high voltage bus, be transferred to CPU control chip through A/D converter, judged according to the voltage and current signal having detected by CPU control chip, and according to judged result, and send corresponding signal to selecting to carry out following steps after DC bias current control circuit:
Select step 1, if system is normally moved, send signal to DC bias current control circuit by CPU control chip, by the DC power supply E in DC bias current control circuit control magnetic switch type short-circuit fault current limiter
kproduce a very large DC bias current i
k, under the effect of this bias current, the iron core of flow restricter reaches degree of depth saturation condition, and now the reactance value of Working winding is very little, is equivalent to magnetic switch " closure ", current-limiting inductance L
0by short circuit;
Select step 2, the fault if voltage, current signal judgement system that CPU control chip basis has detected are short-circuited, transmit a signal to DC bias current control circuit by CPU, by the DC power supply E in DC bias current control circuit control magnetic switch type short-circuit fault current limiter
kproduce a very little DC bias current i
k, iron core is exited fast saturated, now the reactance value of Working winding is very large, and magnetic switch is equivalent to "off", current-limiting inductance L
0in access short-circuit loop.
For a magnetic switch type short-circuit fault current limiter for magnetic switch type short circuit current fault detection method, it is characterized in that, this magnetic switch type short-circuit fault current limiter comprises three sub-flow restricters, i.e. the first sub-flow restricter, the second sub-flow restricter and the 3rd sub-flow restricter; Described three sub-flow restricters include upper and lower two iron yokes that be arranged in parallel and are arranged between iron yoke and vertically disposed four iron props of iron yoke, i.e. the first iron prop, the second iron prop, the 3rd iron prop and the 4th iron prop; On described the second iron prop and the 3rd iron prop, be all wound with direct current winding, described direct current winding skin is wound with one and exchanges winding; Described direct current winding form a circuit loop by DC component.
At the above-mentioned magnetic switch type short-circuit fault current limiter for magnetic switch type short circuit current fault detection method, described DC component comprises a DC power supply E of series connection successively
kwith a current-limiting inductance L
0; On above-mentioned the second iron prop, connect with wherein one end of two head ends of direct current winding on the 3rd iron prop in wherein one end of two head ends of direct current winding; The DC power supply E that on the second iron prop, the other end of two head ends of direct current winding is connected successively with another termination of two head ends of direct current winding on the 3rd iron prop
kwith current-limiting inductance L
0rear built-up circuit loop; Draw for two of the head end of described interchange winding and connect respectively tested high voltage bus.
A kind of magnetic switch type short-circuit fault current limiter for magnetic switch type short circuit current fault detection method, it is characterized in that, comprise upper and lower two iron yoke sheets that be arranged in parallel and be arranged between iron yoke sheet and vertically disposed eight iron props of iron yoke sheet, i.e. the 5th iron prop, the 6th iron prop, the 7th iron prop, the 8th iron prop, Kowloon Railway Bureau post, the tenth iron prop, the 11 iron prop and the 12 iron prop; Described the 6th iron prop, the 7th iron prop, the 8th iron prop, Kowloon Railway Bureau post, the tenth iron prop and the 11 iron prop are all wound with direct current winding, i.e. the first direct current winding, the second direct current winding, the 3rd direct current winding, the 4th direct current winding, the 5th direct current winding and the 6th direct current winding; The first described direct current winding is wound with one first with the second direct current winding skin and exchanges winding; The 3rd described direct current winding is wound with one second with the 4th direct current winding skin and exchanges winding; The 5th described direct current winding is wound with one the 3rd with the 6th direct current winding skin and exchanges winding; First DC component of passing through of described the first direct current winding and the second direct current winding forms a circuit loop; Second DC component of passing through of described the 3rd direct current winding and the 4th direct current winding forms a circuit loop; The 3rd DC component of passing through of described the 5th direct current winding and the 6th direct current winding forms a circuit loop; Described the first interchange winding, the second interchange winding and the 3rd interchange winding connect respectively the three-phase bus of tested high voltage bus.
At the above-mentioned magnetic switch type short-circuit fault current limiter for magnetic switch type short circuit current fault detection method, described the first DC component comprises a DC power supply E of series connection successively
kwith a current-limiting inductance L
0; On above-mentioned the 6th iron prop, connect with wherein one end of two head ends of the second direct current winding on the 7th iron prop in wherein one end of two head ends of the first direct current winding; The DC power supply E that on the 6th iron prop, the other end of two head ends of the first direct current winding is connected successively with another termination of two head ends of the second direct current winding on the 7th iron prop
kwith current-limiting inductance L
0rear built-up circuit loop.
At the above-mentioned magnetic switch type short-circuit fault current limiter for magnetic switch type short circuit current fault detection method, described the second DC component comprises a DC power supply E of series connection successively
kwith a current-limiting inductance L
0; On above-mentioned the 8th iron prop, connect with wherein one end of two head ends of the 4th direct current winding on Kowloon Railway Bureau post in wherein one end of two head ends of the 3rd direct current winding; The DC power supply E that on the 8th iron prop, the other end of two head ends of the 3rd direct current winding is connected successively with another termination of two head ends of the 4th direct current winding on Kowloon Railway Bureau post
kwith current-limiting inductance L
0rear built-up circuit loop.
At the above-mentioned magnetic switch type short-circuit fault current limiter for magnetic switch type short circuit current fault detection method, described the 3rd DC component comprises a DC power supply E of series connection successively
kwith a current-limiting inductance L
0; On above-mentioned the tenth iron prop, connect with wherein one end of two head ends of the 6th direct current winding on the 11 iron prop in wherein one end of two head ends of the 5th direct current winding; The DC power supply E that on the tenth iron prop, the other end of two head ends of the 5th direct current winding is connected successively with another termination of two head ends of the 6th direct current winding on the 11 iron prop
kwith current-limiting inductance L
0rear built-up circuit loop.
Therefore, tool of the present invention has the following advantages: simple in structure, fast response time, matches with protective relaying device; restriction system short circuit current fast and effectively; meet the technical requirement of current limliting, and be easy to high-voltage large-capacity, meet the demand for development of electric power system.
Brief description of the drawings
Fig. 1 is phase structure figure schematic diagram of the present invention.
Fig. 2 is three-phase structure figure schematic diagram of the present invention.
Fig. 3 is connection principle schematic diagram of the present invention.
Fig. 4 is control system block diagram of the present invention.
Fig. 5 is control flow schematic diagram of the present invention.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.In figure, iron yoke 1, the first iron prop 2, the second iron prop 3, the 3rd iron prop 4, the 4th iron prop 5, iron yoke sheet 6, the 5th iron prop 7, the 6th iron prop 8, the 7th iron prop 9, the 8th iron prop 10, Kowloon Railway Bureau post 11, the tenth iron prop the 12, the 11 iron prop the 13, the 12 iron prop 14, the first direct current winding 15, the second direct current winding 16, the 3rd direct current winding 17, the 4th direct current winding 18, the 5th direct current winding 19, the 6th direct current winding 20, the first interchange winding 21, the second interchange winding 22, the 3rd exchange winding 23.
Embodiment 1:
As shown in Figure 1, adopt the sub-flow restricter shown in three Fig. 1, the direct current winding of three sub-flow restricters forms loop by DC component respectively, three sub-flow restricter interchange windings connect respectively the three-phase bus of high voltage bus, then by voltage transformer pt, Current Transmit is received on tested three-phase high-voltage bus, by voltage transformer pt, Current Transmit is received on CPU control chip by A/D converter respectively, CPU control chip is connected with a magnetic switch type short-circuit fault current limiter by a DC bias current control circuit, magnetic switch type short-circuit fault current limiter is connected to each phase bus of three-phase high-voltage bus, when detection: voltage transformer pt, Current Transmit detect the voltage and current signal on high voltage bus, be transferred to CPU control chip through A/D converter, judged according to the voltage and current signal having detected by CPU control chip, and according to judged result, and send corresponding signal to selecting to carry out following steps after DC bias current control circuit:
Select step 1, if system is normally moved, send signal to DC bias current control circuit by CPU control chip, by the DC power supply E in DC bias current control circuit control magnetic switch type short-circuit fault current limiter
kproduce a very large DC bias current i
k, under the effect of this bias current, the iron core of flow restricter reaches degree of depth saturation condition, and now the reactance value of Working winding is very little, is equivalent to magnetic switch " closure ", current-limiting inductance L
0by short circuit;
Select step 2, the fault if voltage, current signal judgement system that CPU control chip basis has detected are short-circuited, transmit a signal to DC bias current control circuit by CPU, by the DC power supply E in DC bias current control circuit control magnetic switch type short-circuit fault current limiter
kproduce a very little DC bias current i
k, iron core is exited fast saturated, now the reactance value of Working winding is very large, and magnetic switch is equivalent to "off", current-limiting inductance L
0in access short-circuit loop.
Embodiment 2, for the not high tested bus of high tension voltage load, can adopt the structure as Fig. 2, direct current winding forms loop by DC component respectively, exchange the three-phase bus that winding connects respectively high voltage bus, then by voltage transformer pt, Current Transmit is received on tested three-phase high-voltage bus, by voltage transformer pt, Current Transmit is received on CPU control chip by A/D converter respectively, CPU control chip is connected with a magnetic switch type short-circuit fault current limiter by a DC bias current control circuit, magnetic switch type short-circuit fault current limiter is connected to each phase bus of three-phase high-voltage bus, when detection: voltage transformer pt, Current Transmit detect the voltage and current signal on high voltage bus, be transferred to CPU control chip through A/D converter, judged according to the voltage and current signal having detected by CPU control chip, and according to judged result, and send corresponding signal to selecting to carry out following steps after DC bias current control circuit:
Select step 1, if system is normally moved, send signal to DC bias current control circuit by CPU control chip, by the DC power supply E in DC bias current control circuit control magnetic switch type short-circuit fault current limiter
kproduce a very large DC bias current i
k, under the effect of this bias current, the iron core of flow restricter reaches degree of depth saturation condition, and now the reactance value of Working winding is very little, is equivalent to magnetic switch " closure ", current-limiting inductance L
0by short circuit;
Select step 2, the fault if voltage, current signal judgement system that CPU control chip basis has detected are short-circuited, transmit a signal to DC bias current control circuit by CPU, by the DC power supply E in DC bias current control circuit control magnetic switch type short-circuit fault current limiter
kproduce a very little DC bias current i
k, iron core is exited fast saturated, now the reactance value of Working winding is very large, and magnetic switch is equivalent to "off", current-limiting inductance L
0in access short-circuit loop.
Magnetic switch type current limiter of short circuit current fast response time, matches with protective relaying device, and restriction system short circuit current fast and effectively meets the technical requirement of current limliting.
Adopt after device of the present invention and method,
1, in the time that electrical network normally moves, magnetic switch " closure ", current-limiting inductance is by short circuit, and current limiter of short circuit current is low impedance state, and voltage loss is little, does not affect the running status of electrical network.
2, in the time that electrical network is short-circuited fault, magnetic switch "off", current-limiting inductance access short-circuit loop, effectively limiting short-circuit current.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendments or supplement or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although more used iron yoke 1 herein, the first iron prop 2, the second iron prop 3, the 3rd iron prop 4, the 4th iron prop 5, iron yoke sheet 6, the 5th iron prop 7, the 6th iron prop 8, the 7th iron prop 9, the 8th iron prop 10, Kowloon Railway Bureau post 11, the tenth iron prop 12, the 11 iron prop 13, the 12 iron prop 14, the first direct current winding 15, the second direct current winding 16, the 3rd direct current winding 17, the 4th direct current winding 18, the 5th direct current winding 19, the 6th direct current winding 20, first exchanges winding 21, second exchanges winding 22, the 3rd exchanges winding 23 terms such as grade, but do not get rid of the possibility that uses other term.Use these terms to be only used to describe more easily and explain essence of the present invention; They are construed to any additional restriction is all contrary with spirit of the present invention.
Claims (6)
1. a magnetic switch type short-circuit fault current limiter, is characterized in that, this magnetic switch type short-circuit fault current limiter comprises three sub-flow restricters, i.e. the first sub-flow restricter, the second sub-flow restricter and the 3rd sub-flow restricter; Described three sub-flow restricters include upper and lower two iron yokes (1) that be arranged in parallel and are arranged between iron yoke (1) and vertically disposed four iron props of iron yoke (1), i.e. the first iron prop (2), the second iron prop (3), the 3rd iron prop (4) and the 4th iron prop (5); On described the second iron prop (3) and the 3rd iron prop (4), be all wound with direct current winding, described direct current winding skin is wound with one and exchanges winding; Described direct current winding form a circuit loop by DC component.
2. a kind of magnetic switch type short-circuit fault current limiter according to claim 1, is characterized in that, described DC component comprises a DC power supply E of series connection successively
kwith a current-limiting inductance L
0; Connect with wherein one end of two head ends of the upper direct current winding of the 3rd iron prop (4) in wherein one end of upper two head ends of direct current winding of above-mentioned the second iron prop (3); The DC power supply E that the other end of upper two head ends of direct current winding of the second iron prop (3) is connected successively with another termination of two head ends of the upper direct current winding of the 3rd iron prop (4)
kwith current-limiting inductance L
0rear built-up circuit loop; Draw for two of the head end of described interchange winding and connect respectively tested high voltage bus.
3. the magnetic switch type short-circuit fault current limiter of a kind, it is characterized in that, comprise upper and lower two iron yoke sheets (6) that be arranged in parallel and be arranged between iron yoke sheet (6) and vertically disposed eight iron props of iron yoke sheet (6), i.e. the 5th iron prop (7), the 6th iron prop (8), the 7th iron prop (9), the 8th iron prop (10), Kowloon Railway Bureau post (11), the tenth iron prop (12), the 11 iron prop (13) and the 12 iron prop (14); Described the 6th iron prop (8), the 7th iron prop (9), the 8th iron prop (10), Kowloon Railway Bureau post (11), the tenth iron prop (12) and the 11 iron prop (13) are all wound with direct current winding, i.e. the first direct current winding (15), the second direct current winding (16), the 3rd direct current winding (17), the 4th direct current winding (18), the 5th direct current winding (19) and the 6th direct current winding (20); The first described direct current winding (15) is wound with one first with the second direct current winding (16) skin and exchanges winding (21); The 3rd described direct current winding (17) is wound with one second with the 4th direct current winding (18) skin and exchanges winding (22); The 5th described direct current winding (19) is wound with one the 3rd with the 6th direct current winding (20) skin and exchanges winding (23); First DC component of passing through of described the first direct current winding (15) and the second direct current winding (16) forms a circuit loop; Second DC component of passing through of described the 3rd direct current winding (17) and the 4th direct current winding (18) forms a circuit loop; The 3rd DC component of passing through of described the 5th direct current winding (19) and the 6th direct current winding (20) forms a circuit loop; Described the first interchange winding (22), the second interchange winding (23) and the 3rd interchange winding (23) connect respectively the three-phase bus of tested high voltage bus.
4. a kind of magnetic switch type short-circuit fault current limiter according to claim 3, is characterized in that, described the first DC component comprises a DC power supply E of series connection successively
kwith a current-limiting inductance L
0; Connect with wherein one end of two head ends of upper the second direct current winding (16) of the 7th iron prop (9) in wherein one end of (15) two head ends of upper the first direct current winding of above-mentioned the 6th iron prop (8); The DC power supply E that the other end of (15) two head ends of upper the first direct current winding of the 6th iron prop (8) is connected successively with another termination of two head ends of upper the second direct current winding (16) of the 7th iron prop (9)
kwith current-limiting inductance L
0rear built-up circuit loop.
5. a kind of magnetic switch type short-circuit fault current limiter according to claim 3, is characterized in that, described the second DC component comprises a DC power supply E of series connection successively
kwith a current-limiting inductance L
0; Connect with wherein one end of two head ends of upper the 4th direct current winding (18) of Kowloon Railway Bureau post (11) in wherein one end of (17) two head ends of upper the 3rd direct current winding of above-mentioned the 8th iron prop (10); The DC power supply E that the other end of (17) two head ends of upper the 3rd direct current winding of the 8th iron prop (10) is connected successively with another termination of two head ends of upper the 4th direct current winding (18) of Kowloon Railway Bureau post (11)
kwith current-limiting inductance L
0rear built-up circuit loop.
6. a kind of magnetic switch type short-circuit fault current limiter according to claim 3, is characterized in that, described the 3rd DC component comprises a DC power supply E of series connection successively
kwith a current-limiting inductance L
0; Connect with wherein one end of two head ends of upper the 6th direct current winding (20) of the 11 iron prop (13) in wherein one end of (19) two head ends of upper the 5th direct current winding of above-mentioned the tenth iron prop (12); The DC power supply E that the other end of (19) two head ends of upper the 5th direct current winding of the tenth iron prop (12) is connected successively with another termination of two head ends of upper the 6th direct current winding (20) of the 11 iron prop (13)
kwith current-limiting inductance L
0rear built-up circuit loop.
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| CN201210194932.5A CN102723704B (en) | 2012-06-14 | 2012-06-14 | Magnetic switch type short-circuit current fault detection method and device for same |
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| CN201210194932.5A CN102723704B (en) | 2012-06-14 | 2012-06-14 | Magnetic switch type short-circuit current fault detection method and device for same |
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| CN103647264B (en) * | 2013-12-19 | 2016-01-13 | 特变电工沈阳变压器集团有限公司 | Close coupling type power failure current limiter |
| GB201407338D0 (en) * | 2014-04-25 | 2014-06-11 | Gridon Ltd | Fault current limiter |
| CN104158185A (en) * | 2014-08-19 | 2014-11-19 | 国家电网公司 | Improved method for limiting power plant high voltage bus short circuit current |
| CN104251967B (en) * | 2014-09-01 | 2017-10-03 | 陕西欧瑞特电气有限公司 | A kind of novel central recoil simulator |
| CN104539168A (en) * | 2014-12-17 | 2015-04-22 | 杭州四达电炉成套设备有限公司 | Inductance current stabilization power supply circuit |
| GB201501606D0 (en) * | 2015-01-30 | 2015-03-18 | Gridon Ltd | Fault current limiter |
| CN104836216B (en) * | 2015-05-29 | 2018-02-09 | 东南大学 | A kind of saturable core type fault current limiter |
| CN106710849A (en) * | 2016-11-18 | 2017-05-24 | 云南电网有限责任公司电力科学研究院 | Tight-coupling superconducting current limiting reactor |
| CN107611950B (en) * | 2017-09-13 | 2018-08-14 | 国家电网公司 | Depth current-limiting apparatus is lost in one kind zero |
| CN109782163B (en) * | 2018-12-28 | 2020-12-08 | 华中科技大学 | Short circuit detection device and method for magnetic flux constraint type current limiting switch |
| CN112186720B (en) * | 2020-08-24 | 2022-09-13 | 国网河北省电力有限公司电力科学研究院 | High-speed short circuit current limiting device |
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| 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 |
| CN102664393B (en) * | 2012-05-18 | 2015-08-12 | 广东电网公司电力科学研究院 | Short circuit current current-limiting apparatus |
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| CN101911422A (en) * | 2008-04-03 | 2010-12-08 | 全能智电力股份有限公司 | A fault current limiter |
| CA2772558A1 (en) * | 2009-08-31 | 2011-03-03 | Bar Ilan Research & Development Company Ltd. | Improved fault current limiter with saturated core |
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