CN106646146B - A method of it calculating unloaded high voltage power cable highest and bears voltage location - Google Patents
A method of it calculating unloaded high voltage power cable highest and bears voltage location Download PDFInfo
- Publication number
- CN106646146B CN106646146B CN201610842296.0A CN201610842296A CN106646146B CN 106646146 B CN106646146 B CN 106646146B CN 201610842296 A CN201610842296 A CN 201610842296A CN 106646146 B CN106646146 B CN 106646146B
- Authority
- CN
- China
- Prior art keywords
- cable
- sine wave
- highest
- wave
- coefficient
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000005428 wave function Effects 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims abstract description 10
- 238000010276 construction Methods 0.000 claims abstract description 5
- 239000004020 conductor Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 230000035699 permeability Effects 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 abstract description 8
- 230000015556 catabolic process Effects 0.000 abstract description 5
- 230000001052 transient effect Effects 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 5
- 230000000644 propagated effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/16—Cables, cable trees or wire harnesses
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention discloses a kind of methods for calculating unloaded high voltage power cable highest and bearing voltage location, including calculate cable loop resistance per unit length, inductance, capacitor and admittance parameter according to construction of cable parameter；According to resistance, inductance, capacitor and admittance parameter, the attenuation coefficient and phase coefficient of cable unit length are calculated；By attenuation coefficient and phase coefficient in conjunction with sinusoidal wave function, sine wave propagation function is constructed；According to sine wave propagation function, voltage computation model is born with each point highest along sine wave propagation law building cable, cable highest is calculated and bears voltage location.The present invention solves the problems, such as to bear voltage location method currently without the unloaded high voltage power cable highest of calculating, it can be in long range non-loaded cable route, the cable transient state breakdown fault analysis of the appearance such as the operation of high pressure power frequency, frequency conversion pressure test, the test of damped vibration wave provides analysis and guidance, and can test for simulated failure cable run breakdown accident and provide data foundation.
Description
Technical field
The present invention relates to a kind of methods for calculating unloaded high voltage power cable highest and bearing voltage location, belong to power technology
Field.
Background technique
At present for long distance transmission line, sine voltage mostly uses steady-state distribution to join along the calculating of transmission line of electricity voltage
Number circuits derive method, calculate the attenuation coefficient and phase coefficient of route, thus along calculating each point steady state voltage, but
It is the computational problem that can not solve sinusoidal traveling wave transient voltage on the transmission line.For sinusoidal traveling wave along cable transmission line,
Each point is most along there is presently no the sine traveling waves caused by maloperation and failure etc. in long-distance cable transmission line of electricity
The calculation method for the transient voltage that height is born.
Summary of the invention
In order to solve the above-mentioned technical problems, the present invention provides a kind of unloaded high voltage power cable highests of calculating to bear voltage
The method of position.
In order to achieve the above object, the technical scheme adopted by the invention is that:
A method of it calculating unloaded high voltage power cable highest and bears voltage location, comprising the following steps:
Cable loop resistance per unit length, inductance, capacitor and admittance parameter are calculated according to construction of cable parameter；
According to resistance, inductance, capacitor and admittance parameter, the attenuation coefficient and phase coefficient of cable unit length are calculated；
By attenuation coefficient and phase coefficient in conjunction with sinusoidal wave function, sine wave propagation function is constructed；
According to sine wave propagation function, voltage is born with each point highest along sine wave propagation law building cable and is calculated
Model calculates cable highest and bears voltage location.
Cable resistance, inductance, capacitor and admittance parameter calculation formula be
Rθ=[R1+R2+(R1κ1+R2κ2)(θ-20)]/n
G=ω ' C × tan δ
Wherein, RθFor D.C. resistance of the cable loop at temperature θ, R1For in temperature θ, unit length cable core is led
Body D.C. resistance, R2For in temperature θ, unit length cable cover(ing) conductor DC resistance, κ1Cable when for each absolute temperature θ
The corresponding temperature coefficient of cable core conductor material, κ2Cable cover(ing) conductor material corresponding temperature coefficient when for each absolute temperature θ,
N is route number in parallel in circuit；
L is cable loop unit length inductance, μ0For space permeability, mean geometrical distance of the s between cable core, Dco
For cable conductor outer diameter；
C is cable loop capacitance per unit length, ε0For permittivity of vacuum, εrFor the relative dielectric constant of insulating materials, Di
By examination cable metal sheath internal diameter, DnFor in cable loop with other parallel line distances, DcFor cable core outer diameter；
G is cable loop unit length conductance, and ω ' is power frequency angular frequency, and tan δ is the loss factor of material.
The calculation formula of attenuation coefficient and phase coefficient is,
Wherein, α, β respectively indicate attenuation coefficient and phase coefficient, and ω is angular frequency.
Sine wave propagation function U+(x, t) is,
0≤t≤tm
Wherein, t is propagation time, tmFor the time of waveform, A is waveforms amplitude, and x is sine wave since cable incidence end
Displacement on cable termination direction,The initial phase of waveform is generated for sine wave sources, g (t-x/v) is the function of definition,V indicates velocity of wave.
Each point voltage is along cable,
U (x, t)=U-(x,t)+U+(x,t)
Wherein, U-(x, t) is reflection wave function,
Wherein, l is cable length.
Work as tmWhen >=(2l+ λ)/v:
Cable any point all undergoes sine wave and back wave at least a cycle simultaneously, then
0≤δ≤π
X '=l-x
Wherein, x ' is the distance of wave travel positional distance cable termination, and λ indicates wavelength,
When U (x, t) maximum, the x solved is that cable highest bears voltage location；
Work as tmWhen < (2l+ λ)/v:
When sine wave is transmitted to cable termination from cable head-end for the first time, wave function U is reflected_(x, t)=0；
0≤t≤tm
0≤x≤vt
Wherein,
If 0≤x '≤tmV/2- λ, section inner cable any point all undergo sine wave and at least one week of back wave simultaneously
Phase；
0≤δ≤π
X '=l-x
Wherein,
If 0 < tmV/2- λ < x '≤tmV/2 or 0 < x '≤tmV/2 < λ, sine wave on the inner cable any point of section
(the t less than 2 π is undergone with back wavemV-2x') the phase angle variations of β/2；
(l-x)/v+tm/2+x/v≤t≤tm+x/v
0≤δ≤π
X '=l-x
Wherein,
As max [U1(x,t),U2(x,t),U3(x, t)] it is maximum when, the x solved is that cable highest bears voltage location.
It is held advantageous effects of the invention: the present invention is solved currently without the unloaded high voltage power cable highest of calculating
It the problem of by voltage location method, can be in long range non-loaded cable route, the operation of high pressure power frequency, be damped frequency conversion pressure test
The cable transient state breakdown fault analysis of the appearance such as Sasser test provides analysis and guidance, and can puncture for simulated failure cable run
Accident test provides data foundation.
Detailed description of the invention
Fig. 1 is flow chart of the invention.
Fig. 2 is cable distribution Simplified analysis figure.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
As shown in Figure 1, a kind of method for calculating unloaded high voltage power cable highest and bearing voltage location, including following step
It is rapid:
1) cable loop resistance per unit length, inductance, capacitor and admittance parameter are calculated according to construction of cable parameter.
Specific formula for calculation is as follows:
Rθ=[R1+R2+(R1κ1+R2κ2)(θ-20)]/n
Wherein, RθFor D.C. resistance of the cable loop at temperature θ, R1For in temperature θ, unit length cable core is led
Body D.C. resistance, R2For in temperature θ, unit length cable cover(ing) conductor DC resistance, κ1Cable when for each absolute temperature θ
The corresponding temperature coefficient of cable core conductor material, κ2Cable cover(ing) conductor material corresponding temperature coefficient when for each absolute temperature θ,
N is route number in parallel in circuit.
Wherein, L is cable loop unit length inductance, μ0For space permeability, geometric average of the s between cable core away from
From DcoFor cable conductor outer diameter.
Wherein, C is cable loop in capacitance per unit length, ε0For permittivity of vacuum, εrFor the opposite dielectric of insulating materials
Constant, DiBy examination cable metal sheath internal diameter, DnFor in cable loop with other parallel line distances, DcFor cable core
Outer diameter.
G=ω ' C × tan δ
Wherein, G is cable loop unit length conductance, and ω ' is power frequency angular frequency, and tan δ is the loss factor of material.
2) according to resistance, inductance, capacitor and admittance parameter, attenuation coefficient and the phase system of cable unit length are calculated
Number.
It is derived from according to the calculating of distributed constant circuit principle:
Wherein, α, β respectively indicate attenuation coefficient and phase coefficient, and ω is angular frequency.
3) by attenuation coefficient and phase coefficient in conjunction with sinusoidal wave function, sine wave propagation function is constructed.
Sinusoidal wave function f (t) are as follows:
0≤t≤tm
Wherein, t is propagation time, tmFor the time of waveform, A is waveforms amplitude,The first of waveform is generated for sine wave sources
Beginning phase.
Therefore sine wave propagation function U+(x, t) are as follows:
0≤t≤tm
Wherein, x is displacement of the sine wave since cable incidence end on cable termination direction, and g (t-x/v) is definition
Function,V=ω/β indicates velocity of wave.
4) according to sine wave propagation function, potentiometer is born with each point highest along sine wave propagation law building cable
Model is calculated, cable highest is calculated and bears voltage location.
Sine wave is propagated have a characteristic that in the cable
1, the sinusoidal waveform time was less than at the propagation time of double length cable, and cable zero load is believed that cable two
Terminal impedance is infinitely great, and multiple reflections can occur in cable for sine wave, due to there are waveform attenuating, when cable attenuation coefficient is big,
Cable ceiling voltage point possibly is present at the head end position of cable；And when cable attenuation coefficient is small, cable ceiling voltage point may
There is the overlapping portion of incidence wave and back wave, since there are waveform attenuating, incidence wave and back wave maximum superimposed voltages
At the beginning of appearing in cable termination when secondary reflection, the superposition section of incidence wave and back wave on cable termination to incident extreme direction.
2, it is greater than when the sinusoidal waveform time in the propagation time of double length cable, cable any point is all undergone just simultaneously
String wave and back wave at least a cycle, cable end piece are unloaded, it is believed that impedance is infinitely great, and incidence end connects power supply, impedance
It is believed that being zero, therefore, sine wave is propagated in the cable, when voltage reflection wave reflects again from terminal arrival cable incidence end,
Voltage reflection coefficient is 0, so maximum voltage need to only consider that sine wave passes to terminal from incidence end along cable, back wave is from terminal
Pass to maximum voltage along the cable in incidence end this period.
To sum up, maximum voltage bears point and possibly is present at cable incidence end or cable termination to incidence end side along cable
The superposition section of upward incidence wave and back wave.
Definition cable length is l, and cable distribution Simplified analysis figure is as shown in Fig. 2, due to cable end piece zero load, it is believed that resistance
Anti- infinity, therefore terminal voltage refraction coefficient is 0, voltage reflection coefficient 1.Therefore, wave function U is reflected_(x, t) are as follows:
Wherein, 0≤x≤l.
Each point voltage along cable are as follows:
U (x, t)=U_(x,t)+U+(x,t)
Work as tmWhen >=(2l+ λ)/v:
Cable any point all undergoes sine wave and back wave at least a cycle simultaneously, then
0≤δ≤π
X '=l-x
Wherein, x ' is the distance of wave travel positional distance cable termination, and λ indicates wavelength,
T is the period,
When U (x, t) maximum, the x solved is that cable highest bears voltage location.
Work as tmWhen < (2l+ λ)/v:
When sine wave is transmitted to cable termination from cable head-end for the first time, wave function U is reflected_(x, t)=0；
0≤t≤tm
0≤x≤vt
Wherein,
If 0≤x '≤tmV/2- λ, section inner cable any point all undergo sine wave and at least one week of back wave simultaneously
Phase；
0≤δ≤π
X '=l-x
Wherein,
If 0 < tmV/2- λ < x '≤tmV/2 or 0 < x '≤tmV/2 < λ, sine wave on the inner cable any point of section
(the t less than 2 π is undergone with back wavemV-2x') the phase angle variations of β/2；
(l-x)/v+tm/2+x/v≤t≤tm+x/v
0≤δ≤π
X '=l-x
Wherein,
As max [U1(x,t),U2(x,t),U3(x, t)] it is maximum when, the x solved is that cable highest bears voltage location.
In order to further illustrate the above method, following case is analyzed.
Target cable structural parameters are as shown in Table 1；
One target cable structural parameters of table
Wherein, D1And D2Tried cable is respectively indicated in circuit at a distance from other two shunt cables.
Following parameter can be solved according to the formula in method, specific as shown in Table 2:
Table two is according to the parameter of construction of cable gain of parameter
Sinusoidal wave function f (t) are as follows:
F (t)=1.28 × 103sin(2000πt+90°)
0≤t≤1.5×10-3
According to sinusoidal wave function:
0≤x≤5.3×104
tmThe v/2- λ of λ=- 0.25 < 0, there is no need to calculate U2(x,t)；
As 0 < x'≤tmWhen v/2=0.75 λ, then
max[U1(x,t),U2(x,t),U3(x, t)]=1.28 × 105。
The above method is the attenuation coefficient and phase coefficient by calculating cable unit length route, in conjunction with cable sine
Waveform parameter establishes the propagation function that sinusoidal traveling wave is propagated in the cable, establishes with trigonometric function operation method about cable axis
To the mathematical model of voltage is born, to calculate the position that cable highest bears electrical voltage point.
The above method solves the problems, such as to bear voltage location method currently without calculating unloaded high voltage power cable highest,
It can be the cable of the appearance such as the operation of high pressure power frequency, frequency conversion pressure test, the test of damped vibration wave in long range non-loaded cable route
The analysis of transient state breakdown fault provides analysis and guidance, and can test for simulated failure cable run breakdown accident and provide data foundation.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (3)
1. a kind of method for calculating unloaded high voltage power cable highest and bearing voltage location, it is characterised in that: include the following steps,
Cable loop resistance per unit length, inductance, capacitor and admittance parameter are calculated according to construction of cable parameter；
According to resistance, inductance, capacitor and admittance parameter, the attenuation coefficient and phase coefficient of cable unit length are calculated；
By attenuation coefficient and phase coefficient in conjunction with sinusoidal wave function, sine wave propagation function is constructed；
According to sine wave propagation function, voltage is born with each point highest along sine wave propagation law building cable and calculates mould
Type calculates cable highest and bears voltage location；
Sine wave propagation function U+(x, t) is,
0≤t≤tm
Wherein, t is propagation time, tmFor the time of waveform, A is waveforms amplitude, and x is for sine wave to electricity since cable incidence end
The upward displacement of cable terminal side,The initial phase of waveform is generated for sine wave sources, g (t-x/v) is the function of definition,V indicates velocity of wave, and α, β respectively indicate attenuation coefficient and phase
Potential coefficient；
Each point voltage is along cable,
U (x, t)=U-(x,t)+U+(x,t)
Wherein, U-(x, t) is reflection wave function,
Wherein, l is cable length；
Work as tmWhen >=(2l+ λ)/v:
Cable any point all undergoes sine wave and back wave at least a cycle simultaneously, then
0≤δ≤π
X '=l-x
Wherein, x ' is the distance of wave travel positional distance cable termination, and λ indicates wavelength,When U (x, t) most
When big, the x solved is that cable highest bears voltage location；
Work as tmWhen < (2l+ λ)/v:
When sine wave is transmitted to cable termination from cable head-end for the first time, reflect wave function U- (x, t)=0；
0≤t≤tm
0≤x≤vt
Wherein,
If 0≤x '≤tmV/2- λ, section inner cable any point all undergo sine wave and back wave at least a cycle simultaneously；
0≤δ≤π
X '=l-x
Wherein,
If 0 < tmV/2- λ < x '≤tmV/2 or 0 < x '≤tmV/2 < λ, sine wave and anti-on the inner cable any point of section
Ejected wave undergoes the (t less than 2 πmV-2x') the phase angle variations of β/2；
(l-x)/v+tm/2+x/v≤t≤tm+x/v
0≤δ≤π
X '=l-x
Wherein,
As max [U1(x,t),U2(x,t),U3(x, t)] it is maximum when, the x solved is that cable highest bears voltage location.
2. a kind of method for calculating unloaded high voltage power cable highest and bearing voltage location according to claim 1, special
Sign is: cable resistance, inductance, capacitor and admittance parameter calculation formula be,
Rθ=[R1+R2+(R1κ1+R2κ2)(θ-20)]/n
G=ω ' C × tan δ
Wherein, RθFor D.C. resistance of the cable loop at temperature θ, R1For in temperature θ, unit length cable core conductor is straight
Leakage resistance, R2For in temperature θ, unit length cable cover(ing) conductor DC resistance, κ1Cable core when for each absolute temperature θ
The corresponding temperature coefficient of conductor material, κ2Cable cover(ing) conductor material corresponding temperature coefficient when for each absolute temperature θ, n are
Route number in parallel in circuit；
L is cable loop unit length inductance, μ0For space permeability, mean geometrical distance of the s between cable core, DcoFor electricity
Cable conductor diameter；
C is cable loop capacitance per unit length, ε0For permittivity of vacuum, εrFor the relative dielectric constant of insulating materials, DiFor institute
Try the internal diameter of cable metal sheath, DnFor in cable loop with other parallel line distances, DcFor cable core outer diameter；
G is cable loop unit length conductance, and ω ' is power frequency angular frequency, and tan δ is the loss factor of material.
3. a kind of method for calculating unloaded high voltage power cable highest and bearing voltage location according to claim 1, special
Sign is: the calculation formula of attenuation coefficient and phase coefficient is
Wherein, ω is angular frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610842296.0A CN106646146B (en) | 2016-09-22 | 2016-09-22 | A method of it calculating unloaded high voltage power cable highest and bears voltage location |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610842296.0A CN106646146B (en) | 2016-09-22 | 2016-09-22 | A method of it calculating unloaded high voltage power cable highest and bears voltage location |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106646146A CN106646146A (en) | 2017-05-10 |
| CN106646146B true CN106646146B (en) | 2019-08-23 |
Family
ID=58852329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610842296.0A Active CN106646146B (en) | 2016-09-22 | 2016-09-22 | A method of it calculating unloaded high voltage power cable highest and bears voltage location |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106646146B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161381B (en) * | 2019-04-29 | 2021-04-13 | 云南电网有限责任公司电力科学研究院 | Transformer bushing insulation damp state evaluation method based on oscillation waves |
| CN112432587A (en) * | 2020-09-22 | 2021-03-02 | 国网江西省电力有限公司电力科学研究院 | Method for judging length section of whole-disc cable conductor |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09257849A (en) * | 1996-03-18 | 1997-10-03 | Mitsubishi Electric Corp | Diagnosing method for insulation of cable |
| US6567955B1 (en) * | 1997-09-02 | 2003-05-20 | Hitachi Chemical Company, Ltd. | Method and system for approximating distributed constant line |
| CN102565634A (en) * | 2012-01-10 | 2012-07-11 | 广东电网公司电力科学研究院 | Power cable fault location method based on transfer function method |
| CN103729502A (en) * | 2013-12-19 | 2014-04-16 | 南京南瑞继保电气有限公司 | Method for increasing electromagnetic transient simulation speed of power system |
| CN103941147A (en) * | 2013-12-05 | 2014-07-23 | 国家电网公司 | Distribution network cable single-phase ground fault distance measuring method utilizing transient main frequency component |
| CN104316834A (en) * | 2014-10-16 | 2015-01-28 | 南京航空航天大学 | High-accuracy online cable fault detecting/locating device |
| CN104950231A (en) * | 2015-05-29 | 2015-09-30 | 广西电网有限责任公司电力科学研究院 | Cable insulation partial discharge defect and insulation state voltage resistance testing method and device |
-
2016
- 2016-09-22 CN CN201610842296.0A patent/CN106646146B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09257849A (en) * | 1996-03-18 | 1997-10-03 | Mitsubishi Electric Corp | Diagnosing method for insulation of cable |
| US6567955B1 (en) * | 1997-09-02 | 2003-05-20 | Hitachi Chemical Company, Ltd. | Method and system for approximating distributed constant line |
| CN102565634A (en) * | 2012-01-10 | 2012-07-11 | 广东电网公司电力科学研究院 | Power cable fault location method based on transfer function method |
| CN103941147A (en) * | 2013-12-05 | 2014-07-23 | 国家电网公司 | Distribution network cable single-phase ground fault distance measuring method utilizing transient main frequency component |
| CN103729502A (en) * | 2013-12-19 | 2014-04-16 | 南京南瑞继保电气有限公司 | Method for increasing electromagnetic transient simulation speed of power system |
| CN104316834A (en) * | 2014-10-16 | 2015-01-28 | 南京航空航天大学 | High-accuracy online cable fault detecting/locating device |
| CN104950231A (en) * | 2015-05-29 | 2015-09-30 | 广西电网有限责任公司电力科学研究院 | Cable insulation partial discharge defect and insulation state voltage resistance testing method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106646146A (en) | 2017-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Yang et al. | Numerical study of lightning-induced currents on buried cables and shield wire protection method | |
| Ishii et al. | Lightning-induced voltage on an overhead wire dependent on ground conductivity | |
| Zhang et al. | EMTR‐based fault location for DC line in VSC‐MTDC system using high‐frequency currents | |
| Wang et al. | Travelling wave fault location principle for hybrid multi-terminal LCC-VSC-HVDC transmission line based on R-ECT | |
| CN108627740B (en) | Consider the half-wave power transmission circuit fault distance measurement of traveling wave speed variation and arrival time compensation | |
| CN106646146B (en) | A method of it calculating unloaded high voltage power cable highest and bears voltage location | |
| CN108020754A (en) | Single-ended traveling wave fault location method based on Waveform Reconstructing | |
| CN103344889B (en) | The method of cable local discharge measured by a kind of electric capacity wire jumper | |
| CN107621591A (en) | A kind of transmission line of electricity iteration distance-finding method based on zero mould traveling wave speed variation characteristic | |
| Nan et al. | Asynchronous fault location scheme for half‐wavelength transmission lines based on propagation characteristics of voltage travelling waves | |
| CN110146784A (en) | A kind of cable local defect localization method based on impedance phase changing ratio | |
| Ashrafi Niaki et al. | Fault detection of HVDC cable in multi‐terminal offshore wind farms using transient sheath voltage | |
| Zhang et al. | Wavelet‐based EMTR method for fault location of VSC‐HVDC transmission lines | |
| CN103884967B (en) | One is applicable to the inner partial discharge positioning method of UHV winding and device | |
| CN108107322B (en) | Power cable fault location method | |
| Zhou et al. | A novel method for sign judgment of defects based on phase correction in power cable | |
| CN110321654A (en) | The indoor electromagnetic environment prediction technique combined based on MoM with UTD | |
| Jiang et al. | Novel protection method for VSC‐HVDC transmission lines | |
| Wang et al. | Fault location method for high‐voltage direct current transmission line using incident current travelling waves | |
| CN208383050U (en) | Liquid detecting device and liquid detection system | |
| Kim et al. | Partial discharge location using 2 sensors and optical fibers | |
| Das et al. | Investigations on feasibility of fault detection in underground power cables using SFRA | |
| Tian et al. | Locating partial discharge source occurring on distribution line by using FDTD and TDOA methods | |
| Hashmi et al. | Modeling and Experimental Verification of Covered-Conductor for PD Detection in Overhead Distribution Networks—Modeling Covered-Conductor Overhead Distribution Networks for PD Detection— | |
| Khayam | Electric Field Characteristics inside Three-phase Gas Insulated Switchgear in the Presence of Foreign Metallic Particle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |