CN102436897B - Flexible Rogowski coil used for detecting direct-current system short-circuit current and method for designing same - Google Patents
Flexible Rogowski coil used for detecting direct-current system short-circuit current and method for designing same Download PDFInfo
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- CN102436897B CN102436897B CN201110273144.0A CN201110273144A CN102436897B CN 102436897 B CN102436897 B CN 102436897B CN 201110273144 A CN201110273144 A CN 201110273144A CN 102436897 B CN102436897 B CN 102436897B
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Abstract
The invention discloses a flexible Rogowski coil used for detecting the direct-current system short-circuit current and a method for designing the same, the coil comprises a coil and a loop uniformly wound around an annular flexible framework with an opening, an outer layer insulating bush is sleeved outside the coil and the loop, a plug-type interface attached to the coil and the loop is installed on the opening of the annular flexible framework, the coil outgoing line is connected with a sampling resistance module after being educed through the hole of the plug-type interface, the sampling resistance module educes a signal and is connected with a post-integrating circuit. In the Rogowski coil loop winding technique adopted in the invention, the return wire and the coil winding are constituted by one wire. The head end and the tip end of the Rogowski coil are connected by the plug-type interface, which can improve the mechanical life of the Rogowski coil to a great extent, has the advantages of high reliability and convenience for disassembly and installation; the method for designing the Rogowski coil used for detecting the direct-current system short-circuit current can combine the short circuit physical circumstances and the field working condition of the direct-current system.
Description
Technical field
The invention belongs to electronic current mutual inductor, be specifically related to a kind of Luo-coil for direct current system short circuit current measurement and method for designing thereof.
Background technology
Fault can be detected fast when being short-circuited fault at direct current power system, simultaneously in order to be connected to realize digitized measurement and protection with digital intelligent unit more easily, the Luo-coil based on electromagnetic induction principle is widely used.
Compare with other transient current detection method, the skeleton that open-core type Luo-coil adopts is nonferromagnetic insulating material, because it is containing unshakable in one's determination, does not have in theory magnetic saturation problem, be subject to hardly the restriction of tested size of current, be very suitable for the measurement to large electric current.
In the measurement for the large electric current of transient state, the measurement based on Luo-coil in the past, technologic performance still haves much room for improvement on the one hand, open-core type Luo-coil in the past, due to coiling the enamelled wire that adopts thinner, when Luo-coil is subject to External Force Acting, enamelled wire is easily pulled off, and causes the fault of Luo-coil product; On the other hand, lack a kind of method for designing of procedure as guidance, to be better connected to realize digitized measurement and protection with digital intelligent unit.
Summary of the invention
The object of the present invention is to provide and a kind ofly high amplitude transient current signal can be converted to high-precision flexible Luo-coil and the method for designing thereof detecting for direct current system short circuit current that can be connected with rear class digital intelligent unit.
For achieving the above object, flexible Luo-coil of the present invention comprises coil and the loop line being evenly wound on on the annular flexible back bone of opening, at coil and loop line, be set with outer layer insulation sleeve pipe outward, the plug-in type interface being connected with coil and loop line is installed on the opening of annular flexible back bone, coil outlet is connected with sample resistance module after draw in the hole of plug-in type interface, and sample resistance module is drawn signal and is connected with rear class integrating circuit.
Described sample resistance module comprises the sample resistance being connected with coil outlet through plug-in type interface, and the two ends of described sample resistance are connected with the BNC socket on protecting sheathing simultaneously.
Described flexible back bone consists of flexible insulating material, and how much mid portions of this flexible back bone offer the through hole that loop line is passed through.
Described coil and loop line penetrate the through hole of flexible back bone from one end of flexible back bone; after being drawn by the other end, in individual layer mode, be wound on flexible back bone uniformly, and through being set with fastening and Teflom Insulation Material protective effect on the loop line of flexible back bone through hole.
The two ends of described plug-in type interface are matrix, be provided with thread groove and be threaded with sample resistance module in the middle of plug-in type interface.
Method for designing of the present invention is as follows:
1) first according to direct current system being to the spectrum analysis of the short circuit current of index variation, determine the lower-frequency limit of Luo-coil, according to the lower-frequency limit of gained, determine the time constant of outer integrating circuit;
2) then according to the size of current carrying bus, in the mutual inductance that guarantees to determine the size of Luo-coil flexible back bone under the satisfied condition of insulation condition and to determine Luo-coil according to the time constant of tested current peak and outer integrating circuit;
3) first judge whether single layer coil and loop line meet the requirement of Luo-coil mutual inductance size, if can not meet, change flexible back bone diameter of section and make single layer coil and loop line meet the requirement of mutual inductance size;
4) if meet the requirement of Luo-coil mutual inductance, make the go forward side by side measurement of line parameter of Luo-coil, according to optimum Match, determine the size of outer meeting resistance.
Flexible hollow formula Luo-coil involved in the present invention, improves the structural manufacturing process of Luo-coil, is guaranteeing under the prerequisite of certainty of measurement the mechanical endurance of having improved Luo-coil.Meanwhile, a kind of general method for designing has been proposed, for the detection of electric current under direct current power system short circuit condition.
The proposed by the invention flexible Luo-coil detecting for direct current system short circuit current, framework material should be chosen the good material of temperature characterisitic, adopts silicon rubber as the framework material of Luo-coil.That silicon rubber has is high temperature resistant, high pressure resistant, waterproof, the performance such as anticorrosion, can be operated in-60 ℃～+ 180 ℃, has good pliability, is the ideal material of flexible Luo-coil skeleton.
In the past about the loop line of flexible Luo-coil, mostly be to utilize the heart yearn of cable own as Luo-coil loop line, although install simple, but heart yearn and enamelled wire need to be welded, the shortcoming that this technique is brought be exactly will increase coil itself from distributed capacitance, the frequency bandwidth that reduces coil itself, affects certainty of measurement.Luo-coil loop line wire winding of the present invention, loop line and coil-winding itself consists of a line, specifically silicone rubber for cable inner core taken out, and polytetrafluoroethylmaterial material is inserted in cable inside, as the protective casing of enamelled wire.The skin that described Teflom Insulation Material is enclosed within enamelled wire plays protective effect fastening and that prevent from rupturing, and the loop construction that this technique is made is compact, and fastness is good, can guarantee very high certainty of measurement simultaneously, is applicable to industrial production use.
Described Luo-coil coiling adopts evenly close around mode, this winding mode can guarantee that good interference free performance and very big degree have reduced inhomogeneous the brought measure error that winds the line, the close mutual inductance that can increase coil around mode simultaneously, has improved the signal to noise ratio of measuring.
Accompanying drawing explanation
Fig. 1 is the structural representation of Luo-coil sensing head;
Fig. 2 is the structural representation of Luo-coil sensing head sample resistance module;
Fig. 3 is the structure chart of the outer integrating circuit of Luo-coil;
Fig. 4 is the design flow diagram of outer integral form Luo-coil.
Embodiment
Below in conjunction with accompanying drawing, be described in further details.
Referring to Fig. 1, the present invention includes flexible back bone 2, coil and loop line 1, outer layer insulation sleeve pipe 3, sample resistance module 4 and plug-in type interface 5; Described coil is evenly wound on flexible back bone 2, and coil loop line is embedded in the geometric center of flexible back bone 2, and draw after sample resistance module 4 by plug-in type interface 5 at coiling two ends; Whole Luo-coil forms the annulus of an opening, and first and last end connects by plug-in type interface 5 in use, and Luo-coil is drawn signal and is connected with rear class integrating circuit.Luo-coil loop line wire winding of the present invention, loop line and coil-winding itself consists of a line, specifically silicone rubber for cable inner core taken out, and polytetrafluoroethylmaterial material is inserted in cable inside, as the protective casing of enamelled wire.The skin that described Teflom Insulation Material is enclosed within enamelled wire plays protective effect fastening and that prevent from rupturing, and the loop construction that this technique is made is compact, and fastness is good, can guarantee very high certainty of measurement simultaneously, is applicable to industrial production use.
Referring to Fig. 2, lead-out wires of coil after draw in the hole of plug-in type interface 5 with sample resistance module 4 in sample resistance 8 be welded to connect.The sample resistance two ends while is welded to connect with the BNC socket 6 on protecting sheathing 7.BNC socket is connected with Shielded Twisted Pair, adopts screen to have effect clearly to weakening electrostatic coupling and electromagnetic coupled, and screen should guarantee good earth simultaneously.Twisted-pair feeder reduces inductive interference by reducing the induction area of go-and-return line.
Referring to Fig. 3, external integrating circuit adopts active integration, comprises four parts: i.e. voltage follower circuit, outer integrating circuit, filter circuit, amplifying circuit.
Referring to Fig. 4, the design cycle of the Luo-coil of outer integral form of the present invention is as follows:
1) first according to direct current system being to the spectrum analysis of the short circuit current of index variation, according to the distribution character of energy in signal spectrum characteristic, determine the lower-frequency limit of Luo-coil, to guarantee to reflect accurately the frequency characteristic of primary signal.Because the lower-frequency limit of outer integration type Luo-coil is decided by the time constant of outer integrating circuit,
(f
lfor the lower-frequency limit τ of the Luo-coil time constant that is outer integrating circuit), therefore can determine the time constant of outer integrating circuit according to the lower-frequency limit of gained;
2) then according to the size of current carrying bus, guaranteeing under the satisfied condition of insulation condition, guarantee that system voltage air under setpoint distance is not breakdown, determine the size of Luo-coil flexible back bone and according to the time constant of tested current peak and outer integrating circuit, determine the mutual inductance of Luo-coil, according to formula
(mutual inductance that wherein M is Luo-coil, u
0for according to the maximum of the definite measurement output voltage of system, be generally 10V or 5V etc., the time constant that τ is outer integrating circuit, the peak value that I is current measured);
3) first judge whether coil and loop line single-layer winding mode meet the requirement of Luo-coil mutual inductance size, judgement hypothesis is at single-layer winding and evenly closely whether can meet mutual inductance requirement under mode, and this point can be according to formula mutual inductance
(μ wherein
0for the magnetic permeability of air, value is 4 π * 10
-7, N is the number of turns under single-layer winding mode, the diameter that D is Luo-coil, d is flexible back bone diameter of section) draw, if can not meet, change flexible back bone diameter of section and make single layer coil and loop line meet the requirement of mutual inductance size;
4), if meet the requirement of Luo-coil mutual inductance, make the Luo-coil line parameter self-induction of loop L that goes forward side by side
c, stary capacity of coil C
cand Coil resistance R
cmeasurement, according to optimum Match,
determine outer meeting resistance R
ssize.
Claims (1)
1. a method for designing for the flexible Luo-coil detecting for direct current system short circuit current, is characterized in that:
1) first according to direct current system being to the spectrum analysis of the short circuit current of index variation, determine the lower-frequency limit of Luo-coil, according to the lower-frequency limit of gained, determine the time constant of outer integrating circuit; Wherein, between the time constant of outer integrating circuit and the lower-frequency limit of Luo-coil, meet
f
lfor the lower-frequency limit of Luo-coil, the time constant that τ is outer integrating circuit;
2) then according to the size of current carrying bus, in the mutual inductance that guarantees to determine the size of Luo-coil flexible back bone under the satisfied condition of insulation condition and to determine Luo-coil according to the time constant of tested current peak and outer integrating circuit; Wherein, between the mutual inductance of sieve formula coil and tested current peak and the time constant of outer integrating circuit, meet
m is the mutual inductance of sieve formula coil, u
0be according to the maximum of the definite measurement output voltage of system, be worth for 10V or 5V the peak value that I is current measured;
3) first judge whether coil and loop line single-layer winding mode meet the requirement of Luo-coil mutual inductance size, judgement hypothesis is at single-layer winding and evenly closely whether can meet mutual inductance requirement under mode, according to formula mutual inductance
draw, wherein μ
0for the magnetic permeability of air, value is 4 π * 10
-7, N is the number of turns under single-layer winding mode, the diameter that D is Luo-coil, and d is flexible back bone diameter of section, if can not meet, changes flexible back bone diameter of section and makes single layer coil and loop line meet the requirement of mutual inductance size;
4), if meet the requirement of Luo-coil mutual inductance, make the Luo-coil line parameter self-induction of loop L that goes forward side by side
c, stary capacity of coil C
cand Coil resistance R
cmeasurement, according to optimum Match,
determine outer meeting resistance R
ssize.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110273144.0A CN102436897B (en) | 2011-09-15 | 2011-09-15 | Flexible Rogowski coil used for detecting direct-current system short-circuit current and method for designing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110273144.0A CN102436897B (en) | 2011-09-15 | 2011-09-15 | Flexible Rogowski coil used for detecting direct-current system short-circuit current and method for designing same |
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| CN102436897A CN102436897A (en) | 2012-05-02 |
| CN102436897B true CN102436897B (en) | 2014-01-29 |
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Families Citing this family (16)
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| CN102751081A (en) * | 2012-07-03 | 2012-10-24 | 深圳市创银科技股份有限公司 | Flexible coil current transformer and production method thereof |
| CN103852627A (en) * | 2012-11-30 | 2014-06-11 | 海洋王（东莞）照明科技有限公司 | Alternating-current circuit current probing device |
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| CN104076190A (en) * | 2013-03-29 | 2014-10-01 | 海洋王（东莞）照明科技有限公司 | Direct current detection circuit |
| CN103235169A (en) * | 2013-04-25 | 2013-08-07 | 国家电网公司 | Measuring device for pre-discharging current before insulation breakthrough at VFTO (very fast transient overvoltage) |
| CN103777055B (en) * | 2013-12-03 | 2016-06-01 | 国家电网公司 | The outer integrator sensor of multiple Luo-coil parallel connection |
| CN104297558B (en) * | 2014-10-08 | 2017-08-11 | 中国科学院电工研究所 | A kind of current measuring device |
| CN104345196A (en) * | 2014-10-30 | 2015-02-11 | 南京信息工程大学 | Active weak power frequency current induction coil |
| DE102015115264B3 (en) * | 2015-09-10 | 2016-08-18 | Semikron Elektronik Gmbh & Co. Kg | Centering device for a Rogowski coil, measuring device, power electronic device and a method for arranging a Rogowski coil |
| CN105448498A (en) * | 2015-12-07 | 2016-03-30 | 深圳供电局有限公司 | Traveling wave sensor and coil winding method of magnetic core of traveling wave sensor |
| CN106526302A (en) * | 2016-10-25 | 2017-03-22 | 华中科技大学 | Method for manufacturing high-performance air-core coil with balanced turns |
| CN107768904B (en) * | 2017-10-26 | 2019-11-19 | 国网宁夏电力公司检修公司 | Plug-in Rogowski coil device |
| CN108594312B (en) * | 2018-07-30 | 2024-05-07 | 吉林省电力科学研究院有限公司 | Grounding grid breakpoint detection device and method for arch solenoid transmitting coil |
| CN109613316B (en) * | 2018-11-29 | 2020-12-29 | 江阴市星火电子科技有限公司 | High-precision Rogowski coil |
| CN112730944B (en) * | 2020-12-19 | 2022-03-11 | 华中科技大学 | Current measuring method and device based on Rogowski coil |
| CN114740244B (en) * | 2022-04-01 | 2023-06-20 | 核工业西南物理研究院 | Rogowski coil probe for plasma current distribution diagnosis |
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