CN104898026A - Method and device for positioning of cable fault - Google Patents
Method and device for positioning of cable fault Download PDFInfo
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- CN104898026A CN104898026A CN201510320094.5A CN201510320094A CN104898026A CN 104898026 A CN104898026 A CN 104898026A CN 201510320094 A CN201510320094 A CN 201510320094A CN 104898026 A CN104898026 A CN 104898026A
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Abstract
The invention discloses a method and device for the positioning of a cable fault. The method comprises the steps: receiving the current information of a measurement cable of an optical mutual inductor; determining the fault segment of a cable according to the current information; obtaining the voltage information of the fault segment of the cable; and determining the position of a fault point in the fault segment of the cable according to the voltage information and the current information. The method and device solve a technical problem that the positioning of the cable fault in the prior art is not precise, and achieve the precise positioning of the cable fault.
Description
Technical field
The present invention relates to field of power, in particular to the method and apparatus that a kind of cable fault is located.
Background technology
Cable fault is generally permanent fault, again overlap and can produce larger damage to cable, must search in time and repair, but it is consuming time longer for searching and keeping in repair of cable fault position, very unfavorable to the sustainable requests of power supply, and traditional fault distance measuring method cannot accurate fault location.Therefore for the big city of the multistage statements based on collusion cable of more use, because of the importance of its load, accurately measure abort situation, restore electricity as early as possible, the reliability improving electric power system is significant.
Current, prior art generally realizes cable fault location by methods such as the one-end fault ranging method based on impedance measurement principle, the both-end distance measuring method based on line double-end electrical equipment amount and traveling wave methods.Based on impedance measurement principle one-end fault ranging method by transition resistance and loading effects larger.Both-end distance measuring method based on Two-Terminal Electrical Quantities must obtain the electric current and voltage amount of faulty line both sides, due to statements based on collusion cable system in the middle of exist comparatively polylinker connect, therefore Two-Terminal Electrical Quantities or single-end electrical quantity differ surely meet range finding requirement.And traveling wave method is when being applied to multistage statements based on collusion cable line, because the many meetings of reflection contact cause precision very poor, and the application cost of this technology is higher.To sum up, prior art cannot realize the accurate location to multistage statements based on collusion cable fault.
For above-mentioned technical matters, at present effective solution is not yet proposed.
Summary of the invention
Embodiments provide the method and apparatus of a kind of cable fault location, at least to solve the accurate not technical matters in cable fault location in prior art.
According to an aspect of the embodiment of the present invention, provide the method for a kind of cable fault location, the method comprises: receive the current information that cable measured by light mutual inductor, and according to the cable fault section of current information determination cable; Obtain the information of voltage of cable fault section; According to the position of trouble spot in information of voltage and current information determination cable fault section.
Further, cable comprises some sections of continuous print cable sections, wherein, before the current information receiving light mutual inductor measurement cable, method also comprises: in the cable sections of cable, arrange light mutual inductor, and wherein, each light mutual inductor is arranged on cable continuously; Control the current information that light mutual inductor gathers each cable sections of cable; Wherein, each smooth mutual inductor gathers the current information of one section of cable sections.
Further, current information comprises each phase difference current, stalling current and difference current definite value, wherein, comprise according to current information determination cable fault section: if the difference current of each phase of cable sections, stalling current and difference current definite value meet the first formula, then determine that this cable sections is cable fault section; Wherein, the first formula is I
cD Φ>k × I
r Φand I
cD Φ>I
set, Φ=A, B, C, I
cD Φfor each phase difference current, I
r Φfor stalling current, I
setfor difference current definite value and k are proportional brake coefficient, Φ=A, B, C are A phase, B phase and C phase in three-phase alternating current.
Further, the information of voltage obtaining cable fault section comprises: by the voltage of circuit recursive algorithm based on the voltage at cable two ends, the current information determination cable fault section two ends of each cable sections; Wherein, comprised by the voltage of circuit recursive algorithm based on the voltage at cable two ends, the current information determination cable fault section of each cable sections: by the voltage of the second formula determination cable fault section
wherein, the second formula is:
wherein, cable comprises n section cable sections,
be the electric current of i-th section of cable sections, Z
ibe the impedance of i-th section of cable sections, m section cable sections is the cable sections adjacent with cable fault section.
Further, comprise according to the position of trouble spot in information of voltage and current information determination cable fault section: if the cable data of cable is even, then according to the Method of Cable Trouble Point of the voltage at cable fault section two ends, electric current, transition resistance and cable resistance positioning cable fault section; Wherein, Method of Cable Trouble Point according to the voltage at cable fault section two ends, electric current, transition resistance and cable resistance positioning cable fault section comprises: if the distance of one end of the voltage at the two ends of cable fault section, electric current, transition resistance, cable resistance and trouble spot distance cable fault section meets the 3rd formula, then determine the position of Method of Cable Trouble Point in cable fault section; Wherein, the 3rd formula is U
d=I
d× Z
lX+ I
f× R
fand U
e=I
e× (Z
l-Z
lX)+I
f× R
f, and obtain Z according to the 3rd formula
lX=(I
d+ I
e)
-1× (U
d-U
e+ I
ez
l), U
dfor the voltage of cable fault section one end, I
dfor cable fault segment voltage is U
dthe electric current of one end, U
efor the voltage of the cable fault section other end, I
efor cable fault segment voltage is U
ethe electric current of one end, Z
lfor the resistive impedance of cable fault section, R
ffor the transition resistance of cable fault section, Z
lXfor the trouble spot distance cable fault segment voltage in cable fault section is U
dthe distance of one end.
Further, the cable sections of cable arranges light mutual inductor and comprises: if the cable data of cable is even, then light mutual inductor is set on cable according to predeterminable range; If the cable data of cable is uneven, optic current transformer is installed in the position of cable data change in the cable, and the cable data of the cable sections gathered to make each optic current transformer is even.
According to the another aspect of the embodiment of the present invention, additionally provide the device of a kind of cable fault location, this device comprises: processing unit, measures the current information of cable for receiving light mutual inductor, and according to the cable fault section of current information determination cable; Acquiring unit, for obtaining the information of voltage of cable fault section; Determining unit, for the position according to trouble spot in information of voltage and current information determination cable fault section.
Further, this device also comprises: setting unit, and for arranging light mutual inductor in the cable sections of cable, wherein, each light mutual inductor is arranged on cable continuously; Control module, gathers the current information of each cable sections of cable for controlling light mutual inductor; Wherein, each smooth mutual inductor gathers the current information of one section of cable sections.
Further, processing unit comprises: first determines subelement, if meet the first formula for the difference current of each phase of cable sections, stalling current and difference current definite value, then determines that this cable sections is cable fault section; Wherein, the first formula is I
cD Φ>k × I
r Φand I
cD Φ>I
set, Φ=A, B, C, I
cD Φfor each phase difference current, I
r Φfor stalling current, I
setfor difference current definite value and k are proportional brake coefficient, Φ=A, B, C are A phase, B phase and C phase in three-phase alternating current.
Further, acquiring unit comprises: second determines subelement, for passing through the voltage of circuit recursive algorithm based on the voltage at cable two ends, the current information determination cable fault section two ends of each cable sections; Wherein, second determines that subelement comprises: the first determination module, for the voltage by the second formula determination cable fault section
wherein, the second formula is:
wherein, cable comprises n section cable sections,
be the electric current of i-th section of cable sections, Z
ibe the impedance of i-th section of cable sections, m section cable sections is the cable sections adjacent with cable fault section.
Further, determining unit comprises: locator unit, if even for the cable data of cable, then according to the Method of Cable Trouble Point of the voltage at cable fault section two ends, electric current, transition resistance and cable resistance positioning cable fault section; Wherein, locator unit comprises: the second determination module, if meet the 3rd formula for the distance of one end of the voltage at the two ends of cable fault section, electric current, transition resistance, cable resistance and trouble spot distance cable fault section, then determine the position of Method of Cable Trouble Point in cable fault section; Wherein, the 3rd formula is U
d=I
d× Z
lX+ I
f× R
fand U
e=I
e× (Z
l-Z
lX)+I
f× R
f, and obtain Z according to the 3rd formula
lX=(I
d+ I
e)
-1× (U
d-U
e+ I
ez
l), U
dfor the voltage of cable fault section one end, I
dfor cable fault segment voltage is U
dthe electric current of one end, U
efor the voltage of the cable fault section other end, I
efor cable fault segment voltage is U
ethe electric current of one end, Z
lfor the resistive impedance of cable fault section, R
ffor the transition resistance of cable fault section, Z
lXfor the trouble spot distance cable fault segment voltage in cable fault section is U
dthe distance of one end.
Further, setting unit comprises: first arranges subelement, if even for the cable data of cable, then on cable, arranges light mutual inductor according to predeterminable range; Second arranges subelement, if uneven for the cable data of cable, optic current transformer is installed in the position of cable data change in the cable, and the cable data of the cable sections gathered to make each optic current transformer is even.
In embodiments of the present invention, the cable fault section of the current information determination cable of cable is measured by receiving light mutual inductor; And achieve the accurate location of multistage statements based on collusion cable fault position by the position of trouble spot in the information of voltage that obtains cable fault section and current information determination cable fault section, solve the accurate not technical matters in cable fault location in prior art.In addition, in embodiments of the present invention, the hardware device realizing technical solution of the present invention is all common electrical equipment, and construction costs and engineering reliability achieve further optimization compared to Part Methods of the prior art.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic flow sheet of the method for a kind of optional cable fault location according to the embodiment of the present invention;
Fig. 2 is the apparatus structure schematic diagram of a kind of optional cable fault location according to the embodiment of the present invention;
Fig. 3 is the apparatus structure schematic diagram according to the optional cable fault location of the another kind of the embodiment of the present invention;
Fig. 4 is the apparatus structure schematic diagram of another the optional cable fault location according to the embodiment of the present invention;
Fig. 5 is the apparatus structure schematic diagram of the 4th kind of optional cable fault location according to the embodiment of the present invention;
Fig. 6 is the apparatus structure schematic diagram of the 5th kind of optional cable fault location according to the embodiment of the present invention;
Fig. 7 is the apparatus structure schematic diagram of the 6th kind of optional cable fault location according to the embodiment of the present invention.
Embodiment
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
It should be noted that, term " first ", " second " etc. in instructions of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
Embodiment 1
According to the embodiment of the present invention, provide the method for a kind of cable fault location, as shown in Figure 1, the method comprises:
Step S102: receive the current information that cable measured by light mutual inductor, and according to the cable fault section of current information determination cable;
Step S104: the information of voltage obtaining cable fault section;
Step S106: according to the position of trouble spot in information of voltage and current information determination cable fault section.
In embodiments of the present invention, the cable fault section of the current information determination cable of cable is measured by receiving light mutual inductor; And achieve the accurate location of multistage statements based on collusion cable fault position by the position of trouble spot in the information of voltage that obtains cable fault section and current information determination cable fault section, solve the accurate not technical matters in cable fault location in prior art.
In embodiments of the present invention, the type of cable fault can be, but not limited to be one of following: ground connection, short circuit and broken string etc.Wherein, the reason causing cable to break down can be insulation reduce and breakdown.
Alternatively, cable sections can be the continuous section be divided into by cable according to default unit length, and cable fault section is the cable sections at Method of Cable Trouble Point place, and cable fault section can be any one section in cable sections.
Alternatively, light mutual inductor can be converted to the less secondary current of numerical value primary current larger for numerical value by certain no-load voltage ratio, and has the purposes such as protection, current measurement.Light mutual inductor can be, but not limited to be one of following: optical current mutual inductor or For The Rogowski Optical Current Transformer.
Alternatively, cable comprises some sections of continuous print cable sections, and wherein, before the current information receiving light mutual inductor measurement cable, method also comprises: in the cable sections of cable, arrange light mutual inductor, and wherein, each light mutual inductor is arranged on cable continuously; Control the current information that light mutual inductor gathers each cable sections of cable; Wherein, each smooth mutual inductor gathers the current information of one section of cable sections.
Alternatively, the cable sections of cable arranges light mutual inductor, the mounting means of light mutual inductor can be, but not limited to be one of following: penetration type, column support type, bus-type or bushing type.
Alternatively, current information comprises each phase difference current, stalling current and difference current definite value, wherein, comprise according to current information determination cable fault section: if the difference current of each phase of cable sections, stalling current and difference current definite value meet the first formula, then determine that this cable sections is cable fault section; Wherein, the first formula is I
cD Φ>k × I
r Φand I
cD Φ>I
set, Φ=A, B, C, I
cD Φfor each phase difference current, I
r Φfor stalling current, I
setfor difference current definite value and k are proportional brake coefficient, Φ=A, B, C are A phase, B phase and C phase in three-phase alternating current.
Alternatively, each phase difference current, stalling current and difference current definite value belong to current differential protection category, and current differential protection is that the current phasor of the two ends current transformer of input is poor, the starting operation element when reaching the working value of setting.The equipment (can be the electrical equipments such as cable line, generator, motor, transformer) of protection domain between the two ends current transformer of input.Current differential protection is the one protection in relay protection.Positive phase sequence is the advanced B of A, and before B ultrasonic, C is respectively 120 degree.Negative-phase sequence (being namely negative phase sequence) is the advanced B of A advanced C, C is respectively 120 degree.
Alternatively, the information of voltage obtaining cable fault section comprises: by the voltage of circuit recursive algorithm based on the voltage at cable two ends, the current information determination cable fault section two ends of each cable sections; Wherein, comprised by the voltage of circuit recursive algorithm based on the voltage at cable two ends, the current information determination cable fault section of each cable sections: by the voltage of the second formula determination cable fault section
wherein, the second formula is:
wherein, cable comprises n section cable sections,
be the electric current of i-th section of cable sections, Z
ibe the impedance of i-th section of cable sections, m section cable sections is the cable sections adjacent with cable fault section.
Alternatively, the information of voltage obtaining cable fault section comprises: because voltage transformer (VT) is generally positioned at top and the end of multistage statements based on collusion circuit, breaking down the circuit both sides of section may no-voltage information, therefore needs by the voltage of circuit recursive algorithm based on the voltage at cable two ends, the current information determination cable fault section two ends of each cable sections.
Alternatively, comprise according to the position of trouble spot in information of voltage and current information determination cable fault section: if the cable data of cable is even, then according to the Method of Cable Trouble Point of the voltage at cable fault section two ends, electric current, transition resistance and cable resistance positioning cable fault section; Wherein, Method of Cable Trouble Point according to the voltage at cable fault section two ends, electric current, transition resistance and cable resistance positioning cable fault section comprises: if the distance of one end of the voltage at the two ends of cable fault section, electric current, transition resistance, cable resistance and trouble spot distance cable fault section meets the 3rd formula, then determine the position of Method of Cable Trouble Point in cable fault section; Wherein, the 3rd formula is U
d=I
d× Z
lX+ I
f× R
fand U
e=I
e× (Z
l-Z
lX)+I
f× R
f, and obtain Z according to the 3rd formula
lX=(I
d+ I
e)
-1× (U
d-U
e+ I
ez
l), U
dfor the voltage of cable fault section one end, I
dfor cable fault segment voltage is U
dthe electric current of one end, U
efor the voltage of the cable fault section other end, I
efor cable fault segment voltage is U
ethe electric current of one end, Z
lfor the resistive impedance of cable fault section, R
ffor the transition resistance of cable fault section, Z
lXfor the trouble spot distance cable fault segment voltage in cable fault section is U
dthe distance of one end.
Alternatively, cable data can comprise: characteristic impedance, electric capacity, decay etc., and cable data has reflection cable properties and can by the double attribute of numerical representation method.In the present embodiment, cable data evenly refers to that reflection cable data that is a certain or some cable properties numerically shows as stable linear change or for fixed numbers.
Alternatively, the cable sections of cable arranges light mutual inductor and comprises: if the cable data of cable is even, then light mutual inductor is set on cable according to predeterminable range; If the cable data of cable is uneven, optic current transformer is installed in the position of cable data change in the cable, and the cable data of the cable sections gathered to make each optic current transformer is even.
Alternatively, the effect of optic current transformer can be that primary current larger for numerical value is converted to the less secondary current of numerical value by certain no-load voltage ratio, is used for carrying out protecting, the purposes such as measurement.Compared to common current transformer, optic current transformer has advantage and the economy of highly significant, and such as, without state of saturation, lightweight, volume is little, and precision is high, and without ground magnetic influence, bandwidth, the linearity is good, and dielectric level is high, and range of dynamic measurement is large.
Alternatively, if the cable data of cable is even, then the method arranging light mutual inductor according to predeterminable range on cable can be, according to default unit length, cable is divided into continuous section, light mutual inductor is arranged on the junction of adjacent two cable sections.
Alternatively, if the cable data of cable is uneven, the method of optic current transformer is installed in the position of cable data change in the cable can be the cable data gathering diverse location on cable, and determine that the cable data of or several position presents parameter values size variation trend, then optic current transformer is installed in the position of cable data change in the cable, and the cable data of the cable sections gathered to make each optic current transformer is even.
In embodiments of the present invention, the cable fault section of the current information determination cable of cable is measured by receiving light mutual inductor; And achieve the accurate location of multistage statements based on collusion cable fault position by the position of trouble spot in the information of voltage that obtains cable fault section and current information determination cable fault section, solve the accurate not technical matters in cable fault location in prior art.In addition, in embodiments of the present invention, the hardware device realizing technical solution of the present invention is all common electrical equipment, and construction costs and engineering reliability achieve further optimization compared to Part Methods of the prior art.
Embodiment 2
According to the embodiment of the present invention, provide the device of a kind of cable fault location, as shown in Figure 2, this device comprises:
Processing unit 202, measures the current information of cable for receiving light mutual inductor, and according to the cable fault section of current information determination cable;
Acquiring unit 204, for obtaining the information of voltage of cable fault section;
Determining unit 206, for the position according to trouble spot in information of voltage and current information determination cable fault section.
In embodiments of the present invention, the type of cable fault can be, but not limited to be one of following: ground connection, short circuit and broken string etc.Wherein, the reason causing cable to break down can be insulation reduce and breakdown.
Alternatively, cable sections can be the continuous section be divided into by cable according to default unit length, and cable fault section is the cable sections at Method of Cable Trouble Point place, and cable fault section can be any one section in cable sections.
Alternatively, light mutual inductor can be converted to the less secondary current of numerical value primary current larger for numerical value by certain no-load voltage ratio, and has the purposes such as protection, current measurement.Light mutual inductor can be, but not limited to be one of following: optical current mutual inductor or For The Rogowski Optical Current Transformer.
Alternatively, as shown in Figure 3, this device also comprises:
Setting unit 302, for arranging light mutual inductor in the cable sections of cable, wherein, each light mutual inductor is arranged on cable continuously;
Control module 304, gathers the current information of each cable sections of cable for controlling light mutual inductor;
Wherein, each smooth mutual inductor gathers the current information of one section of cable sections.
Alternatively, setting unit 302 arranges light mutual inductor in the cable sections of cable, and the mounting means of light mutual inductor can be, but not limited to be one of following: penetration type, column support type, bus-type or bushing type.
Alternatively, as shown in Figure 4, processing unit 202 also comprises:
First determines subelement, if meet the first formula for the difference current of each phase of cable sections, stalling current and difference current definite value, then determines that this cable sections is cable fault section;
Wherein, the first formula is I
cD Φ>k × I
r Φand I
cD Φ>I
set, Φ=A, B, C, I
cD Φfor each phase difference current, I
r Φfor stalling current, I
setfor difference current definite value and k are proportional brake coefficient, Φ=A, B, C are A phase, B phase and C phase in three-phase alternating current.
Alternatively, each phase difference current, stalling current and difference current definite value belong to current differential protection category, and current differential protection is that the current phasor of the two ends current transformer of input is poor, the starting operation element when reaching the working value of setting.The equipment (can be the electrical equipments such as cable line, generator, motor, transformer) of protection domain between the two ends current transformer of input.Current differential protection is the one protection in relay protection.Positive phase sequence is the advanced B of A, and before B ultrasonic, C is respectively 120 degree.Negative-phase sequence (being namely negative phase sequence) is the advanced B of A advanced C, C is respectively 120 degree.
Alternatively, as shown in Figure 5, acquiring unit 204 comprises:
Second determines subelement 502, for passing through the voltage of circuit recursive algorithm based on the voltage at cable two ends, the current information determination cable fault section two ends of each cable sections
Wherein, second determines that subelement 502 comprises:
First determination module 504, for the voltage by the second formula determination cable fault section
wherein, the second formula is:
Wherein, cable comprises n section cable sections,
be the electric current of i-th section of cable sections, Z
ibe the impedance of i-th section of cable sections, m section cable sections is the cable sections adjacent with cable fault section.
Alternatively, the information of voltage that acquiring unit 204 obtains cable fault section comprises: because voltage transformer (VT) is generally positioned at top and the end of multistage statements based on collusion circuit, breaking down the circuit both sides of section may no-voltage information, therefore needs by the voltage of circuit recursive algorithm based on the voltage at cable two ends, the current information determination cable fault section two ends of each cable sections.
Alternatively, as shown in Figure 6, determining unit 206 comprises:
Locator unit 602, if even for the cable data of cable, then according to the Method of Cable Trouble Point of the voltage at cable fault section two ends, electric current, transition resistance and cable resistance positioning cable fault section;
Wherein, locator unit 602 comprises:
Second determination module 604, if meet the 3rd formula for the distance of one end of the voltage at the two ends of cable fault section, electric current, transition resistance, cable resistance and trouble spot distance cable fault section, then determines the position of Method of Cable Trouble Point in cable fault section;
Wherein, the 3rd formula is U
d=I
d× Z
lX+ I
f× R
fand U
e=I
e× (Z
l-Z
lX)+I
f× R
f, and obtain Z according to the 3rd formula
lX=(I
d+ I
e)
-1× (U
d-U
e+ I
ez
l), U
dfor the voltage of cable fault section one end, I
dfor cable fault segment voltage is U
dthe electric current of one end, U
efor the voltage of the cable fault section other end, I
efor cable fault segment voltage is U
ethe electric current of one end, Z
lfor the resistive impedance of cable fault section, R
ffor the transition resistance of cable fault section, Z
lXfor the trouble spot distance cable fault segment voltage in cable fault section is U
dthe distance of one end.
Alternatively, cable data can comprise: characteristic impedance, electric capacity, decay etc., and cable data has reflection cable properties and can by the double attribute of numerical representation method.In the present embodiment, cable data evenly refers to that reflection cable data that is a certain or some cable properties numerically shows as stable linear change or for fixed numbers.
Alternatively, as shown in Figure 7, setting unit 302 comprises:
First arranges subelement 702, if even for the cable data of cable, then on cable, arranges light mutual inductor according to predeterminable range;
Second arranges subelement 704, if uneven for the cable data of cable, optic current transformer is installed in the position of cable data change in the cable, and the cable data of the cable sections gathered to make each optic current transformer is even.
Alternatively, the effect of optic current transformer can be that primary current larger for numerical value is converted to the less secondary current of numerical value by certain no-load voltage ratio, is used for carrying out protecting, the purposes such as measurement.Compared to common current transformer, optic current transformer has advantage and the economy of highly significant, and such as, without state of saturation, lightweight, volume is little, and precision is high, and without ground magnetic influence, bandwidth, the linearity is good, and dielectric level is high, and range of dynamic measurement is large.
Alternatively, if the cable data of cable is even, then first to arrange the method that subelement 702 arranges light mutual inductor according to predeterminable range on cable can be, according to default unit length, cable is divided into continuous section, light mutual inductor is arranged on the junction of adjacent two cable sections.
Alternatively, if the cable data of cable is uneven, second arranges subelement 704, and the method for optic current transformer is installed in the position of cable data change in the cable can be the cable data gathering diverse location on cable, and determine that the cable data of or several position presents parameter values size variation trend, then optic current transformer is installed in the position of cable data change in the cable, and the cable data of the cable sections gathered to make each optic current transformer is even.
In embodiments of the present invention, the cable fault section of the current information determination cable of cable is measured by receiving light mutual inductor; And achieve the accurate location of multistage statements based on collusion cable fault position by the position of trouble spot in the information of voltage that obtains cable fault section and current information determination cable fault section, solve the accurate not technical matters in cable fault location in prior art.In addition, in embodiments of the present invention, the hardware device realizing technical solution of the present invention is all common electrical equipment, and construction costs and engineering reliability achieve further optimization compared to Part Methods of the prior art.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that can add required general hardware platform by software according to the method for above-described embodiment and realize, hardware can certainly be passed through, but in a lot of situation, the former is better embodiment.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product is logged in a typing medium (as ROM/RAM, magnetic disc, CD), comprising some instructions in order to make a station terminal equipment (can be mobile phone, computing machine, server, or the network equipment etc.) perform the method for the user profile typing described in each embodiment of the present invention.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
If the integrated unit in above-described embodiment using the form of SFU software functional unit realize and as independently production marketing or use time, can be logged in the typing medium that above computer can read.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words or all or part of of this technical scheme can embody with the form of software product, this computer software product is logged in typing medium, comprises all or part of step of some instructions in order to make one or more computer equipment (can be personal computer, server or the network equipment etc.) perform method described in each embodiment of the present invention.
In the above embodiment of the present invention, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.
In several embodiments that the application provides, should be understood that, disclosed client, the mode by other realizes.Wherein, device embodiment described above is only schematic, the such as division of described unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of unit or module or communication connection can be electrical or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (12)
1. a method for cable fault location, is characterized in that, comprising:
Receive the current information that cable measured by light mutual inductor, and determine the cable fault section of described cable according to described current information;
Obtain the information of voltage of described cable fault section;
The position of trouble spot in described cable fault section is determined according to described information of voltage and described current information.
2. method according to claim 1, is characterized in that, described cable comprises some sections of continuous print cable sections, and wherein, before the current information receiving light mutual inductor measurement cable, described method also comprises:
The cable sections of described cable arranges described smooth mutual inductor, and wherein, described in each, light mutual inductor is arranged on the cables. continuously;
Control described smooth mutual inductor gather described cable each described in the current information of cable sections;
Wherein, each described smooth mutual inductor gathers the current information of one section of described cable sections.
3. method according to claim 2, is characterized in that, described current information comprises each phase difference current, stalling current and difference current definite value, wherein, determines that described cable fault section comprises according to described current information:
If the difference current of each phase of described cable sections, stalling current and difference current definite value meet the first formula, then determine that this cable sections is described cable fault section;
Wherein, described first formula is I
cD Φ>k × I
r Φand I
cD Φ>I
set, Φ=A, B, C, described I
cD Φfor described each phase difference current, described I
r Φfor described stalling current, described I
setfor described difference current definite value and described k are proportional brake coefficient, described Φ=A, B, C are A phase, B phase and C phase in three-phase alternating current.
4. method according to claim 2, is characterized in that, the information of voltage obtaining described cable fault section comprises:
Determined the voltage at described cable fault section two ends based on the voltage at described cable two ends, the current information of cable sections described in each by circuit recursive algorithm;
Wherein, determine that the voltage of described cable fault section comprises by circuit recursive algorithm based on the voltage at described cable two ends, the current information of cable sections described in each:
The voltage of described cable fault section is determined by the second formula
wherein, described second formula is:
Wherein, described cable comprises the described cable sections of n section,
be the electric current of i-th section of described cable sections, described Z
ibe the impedance of i-th section of described cable sections, the described cable sections of m section is the cable sections adjacent with described cable fault section.
5. method according to claim 2, is characterized in that,
Determine that the position of trouble spot in described cable fault section comprises according to described information of voltage and described current information: if the cable data of described cable is even, then locate the Method of Cable Trouble Point of described cable fault section according to the voltage at described cable fault section two ends, electric current, transition resistance and cable resistance;
Wherein, the Method of Cable Trouble Point of locating described cable fault section according to the voltage at described cable fault section two ends, electric current, transition resistance and cable resistance comprises:
If the voltage at the two ends of described cable fault section, electric current, transition resistance, cable resistance and trouble spot meet the 3rd formula apart from the distance of one end of described cable fault section, then determine the position of Method of Cable Trouble Point described in described cable fault section;
Wherein, described 3rd formula is U
d=I
d× Z
lX+ I
f× R
fand U
e=I
e× (Z
l-Z
lX)+I
f× R
f, and obtain Z according to described 3rd formula
lX=(I
d+ I
e)
-1× (U
d-U
e+ I
ez
l), described U
dfor the voltage of described cable fault section one end, described I
dfor described cable fault segment voltage is U
dthe electric current of one end, described U
efor the voltage of the described cable fault section other end, described I
efor described cable fault segment voltage is U
ethe electric current of one end, described Z
lfor the resistive impedance of described cable fault section, described R
ffor the transition resistance of described cable fault section, described Z
lXfor the trouble spot in described cable fault section is U apart from described cable fault segment voltage
dthe distance of one end.
6. method as claimed in any of claims 2 to 5, is characterized in that, the cable sections of described cable arranges described smooth mutual inductor and comprises:
If the cable data of described cable is even, then described smooth mutual inductor is set on the cables. according to predeterminable range;
If the cable data of described cable is uneven, described in described cable, optic current transformer is installed in the position of cable data change, and the described cable data of the cable sections gathered to make optic current transformer described in each is even.
7. a device for cable fault location, is characterized in that, comprising:
Processing unit, measures the current information of cable, and determines the cable fault section of described cable according to described current information for receiving light mutual inductor;
Acquiring unit, for obtaining the information of voltage of described cable fault section;
Determining unit, for determining the position of trouble spot in described cable fault section according to described information of voltage and described current information.
8. device according to claim 7, is characterized in that, described device also comprises:
Setting unit, arranges described smooth mutual inductor in the cable sections at described cable, and wherein, described in each, light mutual inductor is arranged on the cables. continuously;
Control module, for control described smooth mutual inductor gather described cable each described in the current information of cable sections;
Wherein, each described smooth mutual inductor gathers the current information of one section of described cable sections.
9. device according to claim 8, is characterized in that, described processing unit comprises:
First determines subelement, if meet the first formula for the difference current of each phase of described cable sections, stalling current and difference current definite value, then determines that this cable sections is described cable fault section;
Wherein, described first formula is I
cD Φ>k × I
r Φand I
cD Φ>I
set, Φ=A, B, C, described I
cD Φfor described each phase difference current, described I
r Φfor described stalling current, described I
setfor described difference current definite value and described k are proportional brake coefficient, described Φ=A, B, C are A phase, B phase and C phase in three-phase alternating current.
10. device according to claim 8, is characterized in that, described acquiring unit comprises:
Second determines subelement, for being determined the voltage at described cable fault section two ends based on the voltage at described cable two ends, the current information of cable sections described in each by circuit recursive algorithm;
Wherein, described second determines that subelement comprises:
First determination module, for determining the voltage of described cable fault section by the second formula
wherein, described second formula is:
Wherein, described cable comprises the described cable sections of n section,
be the electric current of i-th section of described cable sections, described Z
ibe the impedance of i-th section of described cable sections, the described cable sections of m section is the cable sections adjacent with described cable fault section.
11. devices according to claim 8, is characterized in that,
Described determining unit comprises: locator unit, if even for the cable data of described cable, then locates the Method of Cable Trouble Point of described cable fault section according to the voltage at described cable fault section two ends, electric current, transition resistance and cable resistance;
Wherein, described locator unit comprises:
Second determination module, if meet the 3rd formula for the voltage at the two ends of described cable fault section, electric current, transition resistance, cable resistance and trouble spot apart from the distance of one end of described cable fault section, then determine the position of Method of Cable Trouble Point described in described cable fault section;
Wherein, described 3rd formula is U
d=I
d× Z
lX+ I
f× R
fand U
e=I
e× (Z
l-Z
lX)+I
f× R
f, and obtain Z according to described 3rd formula
lX=(I
d+ I
e)
-1× (U
d-U
e+ I
ez
l), described U
dfor the voltage of described cable fault section one end, described I
dfor described cable fault segment voltage is U
dthe electric current of one end, described U
efor the voltage of the described cable fault section other end, described I
efor described cable fault segment voltage is U
ethe electric current of one end, described Z
lfor the resistive impedance of described cable fault section, described R
ffor the transition resistance of described cable fault section, described Z
lXfor the trouble spot in described cable fault section is U apart from described cable fault segment voltage
dthe distance of one end.
Device in 12. according to Claim 8 to 11 described in any one, is characterized in that, described setting unit comprises:
First arranges subelement, if even for the cable data of described cable, then arranges described smooth mutual inductor on the cables. according to predeterminable range;
Second arranges subelement, if uneven for the cable data of described cable, described in described cable, optic current transformer is installed in the position of cable data change, and the described cable data of the cable sections gathered to make optic current transformer described in each is even.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259470A (en) * | 2015-09-30 | 2016-01-20 | 贵州电力试验研究院 | Fault distance measuring system based on optical current transformers and method |
| CN107015116A (en) * | 2017-04-19 | 2017-08-04 | 山东科汇电力自动化股份有限公司 | The high-tension cable sheath fault localization system and method for anti-the earth stray electrical current interference |
| CN109709447A (en) * | 2019-02-25 | 2019-05-03 | 南京南瑞继保电气有限公司 | A kind of mixed line fault localization method based on differential section discriminating gear |
| CN112363014A (en) * | 2020-10-30 | 2021-02-12 | 贵州电网有限责任公司 | Distribution network ground short circuit fault distance detection system and detection method thereof |
| CN112379215A (en) * | 2020-10-30 | 2021-02-19 | 贵州电网有限责任公司 | Distribution network ground short circuit fault distance detection method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1359010A (en) * | 2000-08-30 | 2002-07-17 | 株式会社赛尔鲍尔 | Apparatus and method for positioning parallel double electricity transmission line |
| US20100188239A1 (en) * | 2006-09-13 | 2010-07-29 | Daniel Rockwell | Monitoring electrical assets for fault and efficiency correction |
| CN101871990A (en) * | 2010-05-24 | 2010-10-27 | 北京交通大学 | Fault positioning system of overhead power transmission line |
| CN104134977A (en) * | 2014-08-25 | 2014-11-05 | 哈尔滨工业大学 | Power transmission line full waveform current differential protection judgment method and device |
| CN104502807A (en) * | 2015-01-13 | 2015-04-08 | 国家电网公司 | Cable line fault positioning method, device and system |
-
2015
- 2015-06-11 CN CN201510320094.5A patent/CN104898026A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1359010A (en) * | 2000-08-30 | 2002-07-17 | 株式会社赛尔鲍尔 | Apparatus and method for positioning parallel double electricity transmission line |
| US20100188239A1 (en) * | 2006-09-13 | 2010-07-29 | Daniel Rockwell | Monitoring electrical assets for fault and efficiency correction |
| CN101871990A (en) * | 2010-05-24 | 2010-10-27 | 北京交通大学 | Fault positioning system of overhead power transmission line |
| CN104134977A (en) * | 2014-08-25 | 2014-11-05 | 哈尔滨工业大学 | Power transmission line full waveform current differential protection judgment method and device |
| CN104502807A (en) * | 2015-01-13 | 2015-04-08 | 国家电网公司 | Cable line fault positioning method, device and system |
Non-Patent Citations (2)
| Title |
|---|
| 伍卓锋: "《高压输电线路故障测距的研究》", 《中国优秀硕士学位论文全文数据库》 * |
| 赵洋: "《多级串带电力电缆线路故障测距技术研究》", 《电气应用》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259470A (en) * | 2015-09-30 | 2016-01-20 | 贵州电力试验研究院 | Fault distance measuring system based on optical current transformers and method |
| CN107015116A (en) * | 2017-04-19 | 2017-08-04 | 山东科汇电力自动化股份有限公司 | The high-tension cable sheath fault localization system and method for anti-the earth stray electrical current interference |
| CN109709447A (en) * | 2019-02-25 | 2019-05-03 | 南京南瑞继保电气有限公司 | A kind of mixed line fault localization method based on differential section discriminating gear |
| CN112363014A (en) * | 2020-10-30 | 2021-02-12 | 贵州电网有限责任公司 | Distribution network ground short circuit fault distance detection system and detection method thereof |
| CN112379215A (en) * | 2020-10-30 | 2021-02-19 | 贵州电网有限责任公司 | Distribution network ground short circuit fault distance detection method |
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