CN108761166B - A kind of induced current calculating method of the cable metal sheath N point ground connection based on matrix analysis - Google Patents
A kind of induced current calculating method of the cable metal sheath N point ground connection based on matrix analysis Download PDFInfo
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Abstract
The induced current for the cable metal sheath N point ground connection that the invention discloses a kind of based on matrix analysis calculates method, and steps are as follows: S1, calculating measurement cable metal sheath resistance R, shield metallic sheath reactance X, cable ends ground resistance R1And R2, the earth ohmic leakage Re；S2, the every segment of calculating account for total line length ratio α1、α2…αn, measure n-1 fault ground resistance Rf1、Rf2…Rf(n‑1)；Each section of line influence electromotive force U that S3, calculating are generated by threephase cable core electric current1、U2、Uf1、Uf2…Ufn, calculate each section of induced electromotive force U generated by threephase cable circulating current in sheath1’、U2’、Uf1’、Uf2’…Ufn'；S4, cable cover(ing) induced electricity flow valuve I is calculated1、I2、If1、If2…Ifn.The method of the present invention can facilitate calculate single-phase multipoint earthing in the case of induced current numerical value on each section of cable.
Description
Technical field
The present invention relates to power cable technical fields, and in particular to a kind of cable metal sheath N point based on matrix analysis
The induced current of ground connection calculates method.
Background technique
Sheath of hv cable circulation is the important indicator of safe operation of power system and Transmission Line Design transformation.In engineering
Relevant criterion is formulated to the restriction of circulating current in sheath numerical value, excessive shield circulating current will lead to electric energy loss, insulation ag(e)ing, current-carrying
Amount reduces, and serious adstante febre even can burn ground wire, cause Operation of Electric Systems failure.
Mechanical damage of the external insulation of cable metallic screens layer when being laid with, the worm mouse being subjected in cable current-carrying operational process
Bite, cable long-term work are to cause cable cover(ing) breakage, the induction of multipoint earthing in the chemical erosion that wet environment is subjected to
Reason, therefore multipoint earthing is one of transmission line of electricity operational process universal phenomenon.
Currently, domestic and foreign scholars, which have been proposed in the induced current under the normal current-carrying operation conditions of route, calculates model, model
Using lumped-parameter circuit and electromagnetic field basic theories, calculation method is more mature, but the model is not particularly suited for metal shield
The case where covering N point ground connection, and rarely have research for the calculation of circulating current model under protective metal shell N point Grounding.
Summary of the invention
The purpose of the present invention is to solve drawbacks described above in the prior art, provide a kind of cable based on matrix analysis
The induced current of protective metal shell N point ground connection calculates method.
The purpose of the present invention can be reached by adopting the following technical scheme that:
A kind of induced current calculating method of the cable metal sheath N point ground connection based on matrix analysis, the calculating side
Method comprises the steps of:
S1, measurement cable metal sheath resistance R, cable metal sheath reactance X, cable are calculated according to cable model and instrument
Two-terminal-grounding resistance R1And R2, the earth ohmic leakage Re；
Route is divided into n sections by S2, n-1 fault points, is calculated every segment and is accounted for total line length ratio α1、α2…αn, measurement
N-1 fault ground resistance Rf1、Rf2…Rf(n-1)；
Each section of line influence electromotive force U that S3, calculating are generated by threephase cable core electric current1、U2、Uf1、Uf2…Ufn, calculate
Each section of induced electromotive force U generated by threephase cable circulating current in sheath1’、U2’、Uf1’、Uf2’…Ufn'；
S4, cable cover(ing) induced electricity flow valuve I is calculated1、I2、If1、If2…Ifn。
Further, the calculation formula of the cable metal sheath resistance R are as follows:
In formula, L is length, ρsFor sheath conductivity, AsFor sheath sectional area, αsFor temperature-coefficient of electrical resistance, TsFor shield
Operating temperature is covered, η is sheath temperature counter conductor temperature ratio.
Further, the calculation formula of the cable metal sheath reactance X are as follows:
In formula, L is length, and ω is angular frequency, and s is conductor axis spacing, and d is sheath average diameter, k0For constant.
Further, the earth ohmic leakage ReCalculation formula are as follows:
Re=π2Lf×10-7 (3)
In formula, L is length, and f is transmission line of electricity running frequency.
Further, every segment accounts for total line length ratio α1、α2…αnIt calculates according to the following formula:
In formula, i=1,2 ..., n, liFor i-th section of cable length, L is length, and meets α1+α2+…+αn=1.
Further, each section of line influence electromotive force U generated by threephase cable core electric current1、U2、Uf1、
Uf2…UfnIt calculates according to the following formula:
In formula, I is cable core electric current, ΦiFor the induced electromotive force generated on i-th section of cable by core electric current, L is
Length, d are two cable core distances, riFor cable cover(ing) radius, i=1,2 ..., (n+2) works as i=3, and 4 ..., (n+2)
When, respectively with Uf1、Uf2…UfnIt is corresponding.
Further, each section of induced electromotive force U generated by threephase cable circulating current in sheath1’、U2’、Uf1’、
Uf2’…Ufn' calculate according to the following formula:
In formula, IiFor the induced current in i sections of sheath, XpiMutual induction reactance, D between sheath p, icWhen for being greatly circuit
Circuit equivalence depth, d are two sheath centre distances, ρcFor soil resistivity, f is frequency, p=1,2 ..., (n+2) works as i=3,
4 ..., when (n+2), respectively with Uf1’、Uf2’…Ufn' corresponding.
Further, the cable cover(ing) induced electricity flow valuve I1、I2、If1、If2…IfnIt is calculated according to following Matrix Formula:
In formula, I=(I1I2If1…Ifn)T, Ie=(Ie1Ie2…Ien)T, U=(U1U2Uf1…Ufn)T, ZijFor impedance piecemeal square
Battle array, and have:
Z22For triple-diagonal symmetry battle array, a11=Zf1+Rf1, aii=Zfi+Rf(i-1)+Rfi, ann=Zfn+Rf(n-1), aj(j+1)=
a(j+1)j=-Rfj, i=2,3 ... (n-1), j=1,2 ... (n-1).
Further, constant k0When cable does not replace, value is 2, is 2.52 when cable transposition, wherein whether cable
Transposition depends on the earthing mode of cable cover(ing), and if cross connection grounding, then cable replaces, furthermore other earthing modes
Cable does not replace.
The present invention has the following advantages and effects with respect to the prior art:
A kind of induced current of the single-phase N point ground connection of cable based on matrix analysis disclosed by the invention calculates method, solves
The theoretical deficient embarrassed look of cable metal sheath multipoint earthing utilizes the shield circulating current shadow in the case of the method analysis multipoint earthing
The factor of sound and changing rule, it is significant to design improvement, the malfunction monitoring of transmission line of electricity.
Detailed description of the invention
Fig. 1 is construction of cable figure in the present invention；
Fig. 2 is induced current circuit equivalent illustraton of model in the present invention；
Fig. 3 is a kind of faradimeter of the cable metal sheath N point ground connection based on matrix analysis disclosed in the present invention
The flow chart of calculation method.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Embodiment
The induced current that the present embodiment discloses a kind of single-phase N point ground connection of the cable based on matrix analysis calculates method, such as Fig. 1
It is shown the most commonly seen structure of current electric power single-core cable, which is suitable for such cable.It is illustrated in figure 2 induction
Current circuit equivalent model, all calculating parameters of the present invention, derivation and the foundation of formula are around this circuit diagram exhibition
It opens, solving each section of faradic numerical value under power cable metal sheath N point Grounding is substantially to solve this circuit.Its
Specifically include the following steps:
1) cable metal sheath two-terminal-grounding resistance R is measured1And R2, the earth ohmic leakage Re.This numerical value can refer to from design
It is directly read in mark, preferably by special instrument in-site measurement, because of time change, the change of circumstances, ground resistance is also continuous
Variation.
2) calculating cable metal sheath resistance R, reference following calculation formula,
In formula, L is length；ρsFor sheath conductivity；AsFor sheath sectional area；αsFor temperature-coefficient of electrical resistance；TsFor shield
Cover operating temperature；η is sheath temperature counter conductor temperature ratio, generally takes 0.8；
3) calculating cable metal sheath reactance X, reference following calculation formula,
In formula, L is length, and ω is angular frequency；S is conductor axis spacing；D is sheath average diameter；k0For constant,
It is 2 when cable does not replace, is 2.52 when transposition.The earthing mode to replace depending on cable cover(ing), if cross interconnected
Ground connection, then cable replaces, and furthermore other earthing modes do not replace.
4) the earth ohmic leakage R is calculatede, reference following calculation formula,
Re=π2Lf×10-7 (3)
In formula, L is length；F is transmission line of electricity running frequency；
5) position of phase and number where confirmation fault point, calculate again on this basis the segmentation of n-1 fault point at
N segment account for the scale factor of whole line length, referring to following calculation formula,
In formula, liFor i-th section of cable length, L is cable overall length, and meets α1+α2+…+αn=1.
6) the induced electromotive force U that core electric current generates is calculated1、U2、Uf1、Uf2…Ufn, reference following calculation formula,
In formula, I is cable core electric current, ΦiFor the induced electromotive force generated on i-th section of cable by core electric current, L is
Cable run overall length, d are two cable core distances, riFor cable cover(ing) radius, i=1,2 ..., (n+2) works as i=3, and 4 ...,
(n+2) when, respectively with Uf1、Uf2…UfnIt is corresponding.
7) the induced electromotive force U that circulating current in sheath generates is calculated1’、U2’、Uf1’、Uf2', reference following calculation formula,
In formula, IiFor the induced current in i sections of sheath, XpiMutual induction reactance, D between sheath p, icWhen for being greatly circuit
Circuit equivalence depth, d are two sheath centre distances, ρcFor soil resistivity, f is frequency；P=1,2 ..., (n+2) works as i=3,
4 ..., when (n+2), respectively with Uf1’、Uf2’…Ufn' corresponding.
8) cable metal sheath fault ground point ground resistance R is measuredfi, i=1,2 .., n-1.The measurement need to be by dedicated
Instrument measures, and resistance value has very big float value with contact condition.
9) complex matrix impedance matrix Z is calculated,
Each matrix in block form expression formula is as follows:
Z22For triple-diagonal symmetry battle array, a11=Zf1+Rf1, aii=Zfi+Rf(i-1)+Rfi, ann=Zfn+Rf(n-1), aj(j+1)=
a(j+1)j=-Rfj, i=2,3 ... (n-1)；J=1,2 ... (n-1).
10) sheath induced electricity flow valuve I is calculated1、I2、If1、If2…Ifn, reference following calculation formula,
In formula, I=(I1I2If1…Ifn)T, Ie=(Ie1Ie2…Ien)T, U=(U1U2Uf1…Ufn)T。
In conclusion the present invention is practicable to propose a kind of single-phase N point ground connection model of the cable based on matrix analysis
And its calculation method, induced current numerical value on each section of cable can be facilitated in the case of calculating single-phase multipoint earthing.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (9)
1. a kind of induced current of the cable metal sheath N point ground connection based on matrix analysis calculates method, which is characterized in that described
Calculation method comprise the steps of:
S1, measurement cable metal sheath resistance R, cable metal sheath reactance X, cable ends are calculated according to cable model and instrument
Ground resistance R1And R2, the earth ohmic leakage Re；
Route is divided into n sections by S2, n-1 fault points, is calculated every segment and is accounted for total line length ratio α1、α2…αn, measure n-1
A fault ground resistance Rf1、Rf2…Rf(n-1)；
Each section of line influence electromotive force U that S3, calculating are generated by threephase cable core electric current1、U2、Uf1、Uf2…Ufn, calculate by three
Each section of induced electromotive force U that phase cable bushing circular current generates1’、U2’、Uf1’、Uf2’…Ufn'；
S4, cable cover(ing) induced electricity flow valuve I is calculated1、I2、If1、If2…Ifn。
2. a kind of induced current of cable metal sheath N point ground connection based on matrix analysis according to claim 1 calculates
Method, which is characterized in that the calculation formula of the cable metal sheath resistance R are as follows:
In formula, L is length, ρsFor sheath conductivity, AsFor sheath sectional area, αsFor temperature-coefficient of electrical resistance, TsFor sheath work
Make temperature, η is sheath temperature counter conductor temperature ratio.
3. a kind of induced current of cable metal sheath N point ground connection based on matrix analysis according to claim 1 calculates
Method, which is characterized in that the calculation formula of the cable metal sheath reactance X are as follows:
In formula, L is length, and ω is angular frequency, and s is conductor axis spacing, and d is sheath average diameter, k0For constant.
4. a kind of induced current of cable metal sheath N point ground connection based on matrix analysis according to claim 1 calculates
Method, which is characterized in that the earth ohmic leakage ReCalculation formula are as follows:
Re=π2Lf×10-7 (3)
In formula, L is length, and f is transmission line of electricity running frequency.
5. a kind of induced current of cable metal sheath N point ground connection based on matrix analysis according to claim 1 calculates
Method, which is characterized in that every segment accounts for total line length ratio α1、α2…αnIt calculates according to the following formula:
In formula, i=1,2 ..., n, liFor i-th section of cable length, L is length, and meets α1+α2+…+αn=1.
6. a kind of induced current of cable metal sheath N point ground connection based on matrix analysis according to claim 1 calculates
Method, which is characterized in that each section of line influence electromotive force U generated by threephase cable core electric current1、U2、Uf1、Uf2…
UfnIt calculates according to the following formula:
In formula, I is cable core electric current, ΦiFor the induced electromotive force generated on i-th section of cable by core electric current, L is sheath
Length, d are two cable core distances, riFor cable cover(ing) radius, i=1,2 ..., (n+2) works as i=3, and 4 ..., when (n+2),
Respectively with Uf1、Uf2…UfnIt is corresponding.
7. a kind of induced current of cable metal sheath N point ground connection based on matrix analysis according to claim 1 calculates
Method, which is characterized in that each section of induced electromotive force U generated by threephase cable circulating current in sheath1’、U2’、Uf1’、Uf2’…
Ufn' calculate according to the following formula:
In formula, IiFor the induced current in i sections of sheath, XpiMutual induction reactance, D between sheath p, icCircuit when for being greatly circuit
Equivalent depth, d are two sheath centre distances, ρcFor soil resistivity, f is frequency, p=1,2 ..., (n+2) works as i=3,
4 ..., when (n+2), respectively with Uf1’、Uf2’…Ufn' corresponding.
8. a kind of induced current of cable metal sheath N point ground connection based on matrix analysis according to claim 1 calculates
Method, which is characterized in that the cable cover(ing) induced electricity flow valuve I1、I2、If1、If2…IfnIt is calculated according to following Matrix Formula:
In formula, I=(I1 I2 If1 … Ifn)T, Ie=(Ie1 Ie2 … Ien)T, U=(U1 U2 Uf1 … Ufn)T, ZijFor resistance
Anti- matrix in block form, and have:
Z22For triple-diagonal symmetry battle array, a11=Zf1+Rf1, aii=Zfi+Rf(i-1)+Rfi, ann=Zfn+Rf(n-1), aj(j+1)=a(j+1)j
=-Rfj, i=2,3 ... (n-1), j=1,2 ... (n-1).
9. a kind of induced current of cable metal sheath N point ground connection based on matrix analysis according to claim 1 calculates
Method, which is characterized in that constant k0When cable does not replace, value is 2, is 2.52 when cable transposition, wherein whether cable
Transposition depends on the earthing mode of cable cover(ing), and if cross connection grounding, then cable replaces, furthermore other earthing modes
Cable does not replace.
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Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4325022A (en) * | 1979-12-17 | 1982-04-13 | Bell Telephone Laboratories, Incorporated | Cable shield fault location using a capacitive-inductive coupler |
| JPH03180771A (en) * | 1989-12-11 | 1991-08-06 | Nippon Telegr & Teleph Corp <Ntt> | Measurement of grounding resistance |
| CN1635585A (en) * | 2004-12-15 | 2005-07-06 | 江苏省电力公司南京供电公司 | Method for inhibiting induced current of power cable sheath |
| CN101025429A (en) * | 2006-12-28 | 2007-08-29 | 上海电力学院 | Method and device for on-line monitoring power cable metal sheath layer insulating state |
| CN101593944A (en) * | 2009-03-19 | 2009-12-02 | 江苏省电力公司苏州供电公司 | The single-core power cables method for pre-controlling cross interconnected sheathing induction current |
| CN103698653A (en) * | 2013-12-30 | 2014-04-02 | 国家电网公司 | System and method for detecting earth fault of sheath of single-core power cable on basis of circulation measurement |
| CN103792467A (en) * | 2014-02-25 | 2014-05-14 | 国家电网公司 | High-voltage crosslinked polyethylene cable grounding current mechanism and fault analysis method |
| CN103926449A (en) * | 2014-04-24 | 2014-07-16 | 江苏省电力公司常州供电公司 | Self-adaptive monitoring method for power cable grounding current |
| CN103941161A (en) * | 2014-05-12 | 2014-07-23 | 国家电网公司 | On-line monitoring system for current and carrying capacity of cable sheath |
| CN105004907A (en) * | 2015-04-20 | 2015-10-28 | 江苏省电力公司常州供电公司 | Power cable intersect cross connection grounding system grounding current monitoring and evaluating method |
| CN105021871A (en) * | 2014-04-17 | 2015-11-04 | 国家电网公司 | Method for determining leakage current of cable line under condition of incomplete information |
| CN105572553A (en) * | 2016-03-02 | 2016-05-11 | 国家电网公司 | Single-core high voltage cable outer jacket insulation and intersect interconnection wiring online test method |
| CN106226650A (en) * | 2016-07-05 | 2016-12-14 | 长沙理工大学 | A kind of single-core power cables protective metal shell Fault Locating Method |
| CN106680662A (en) * | 2016-11-16 | 2017-05-17 | 国网上海电力设计有限公司 | Method for estimating ring current in metal sheath of double-end grounded cross-connected cables |
-
2018
- 2018-03-01 CN CN201810170542.1A patent/CN108761166B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4325022A (en) * | 1979-12-17 | 1982-04-13 | Bell Telephone Laboratories, Incorporated | Cable shield fault location using a capacitive-inductive coupler |
| JPH03180771A (en) * | 1989-12-11 | 1991-08-06 | Nippon Telegr & Teleph Corp <Ntt> | Measurement of grounding resistance |
| CN1635585A (en) * | 2004-12-15 | 2005-07-06 | 江苏省电力公司南京供电公司 | Method for inhibiting induced current of power cable sheath |
| CN101025429A (en) * | 2006-12-28 | 2007-08-29 | 上海电力学院 | Method and device for on-line monitoring power cable metal sheath layer insulating state |
| CN101593944A (en) * | 2009-03-19 | 2009-12-02 | 江苏省电力公司苏州供电公司 | The single-core power cables method for pre-controlling cross interconnected sheathing induction current |
| CN103698653A (en) * | 2013-12-30 | 2014-04-02 | 国家电网公司 | System and method for detecting earth fault of sheath of single-core power cable on basis of circulation measurement |
| CN103792467A (en) * | 2014-02-25 | 2014-05-14 | 国家电网公司 | High-voltage crosslinked polyethylene cable grounding current mechanism and fault analysis method |
| CN105021871A (en) * | 2014-04-17 | 2015-11-04 | 国家电网公司 | Method for determining leakage current of cable line under condition of incomplete information |
| CN103926449A (en) * | 2014-04-24 | 2014-07-16 | 江苏省电力公司常州供电公司 | Self-adaptive monitoring method for power cable grounding current |
| CN103941161A (en) * | 2014-05-12 | 2014-07-23 | 国家电网公司 | On-line monitoring system for current and carrying capacity of cable sheath |
| CN105004907A (en) * | 2015-04-20 | 2015-10-28 | 江苏省电力公司常州供电公司 | Power cable intersect cross connection grounding system grounding current monitoring and evaluating method |
| CN105572553A (en) * | 2016-03-02 | 2016-05-11 | 国家电网公司 | Single-core high voltage cable outer jacket insulation and intersect interconnection wiring online test method |
| CN106226650A (en) * | 2016-07-05 | 2016-12-14 | 长沙理工大学 | A kind of single-core power cables protective metal shell Fault Locating Method |
| CN106680662A (en) * | 2016-11-16 | 2017-05-17 | 国网上海电力设计有限公司 | Method for estimating ring current in metal sheath of double-end grounded cross-connected cables |
Non-Patent Citations (4)
| Title |
|---|
| Research on on-line insulation monitoring and fault location method of mine power supply XLPE cable;Xudong Wang;《2014 IEEE Conference and Expo Transportation Electrification Asia-Pacific (ITEC Asia-Pacific)》;20140903;全文 * |
| 多点泄漏对电力电缆高阻故障探测影响的分析;赵文辉;《中国新技术新产品》;20130810;全文 * |
| 超高压海底电缆护套环流的理论计算新方法;杜兆斌;《华南理工大学学报（自然科学版）》;20131231;全文 * |
| 高压单芯电缆护套接地电流的数模与应用;孙学锋;《山东电机工程学会第四届供电专业学术交流会》;20070801;全文 * |
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