CN102135587A - Fault monitoring method and system of power line - Google Patents
Fault monitoring method and system of power line Download PDFInfo
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- CN102135587A CN102135587A CN 201110034050 CN201110034050A CN102135587A CN 102135587 A CN102135587 A CN 102135587A CN 201110034050 CN201110034050 CN 201110034050 CN 201110034050 A CN201110034050 A CN 201110034050A CN 102135587 A CN102135587 A CN 102135587A
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Abstract
The invention discloses a fault monitoring method and system of a power line and relates to the technical field of power. By means of the fault monitoring method and system, a plurality of types of line faults can be accurately detected; a manager can be helped to position fault positions and to quickly eliminate the line faults; the occurrence of phenomena of mis-declaring the faults or being fail to declare the faults is avoided; the accuracy of the fault detection is improved; and actual requirements are met. A fault detecting method of the power line provided in the embodiment of the invention comprises the following steps of: arranging a power transformer in the power line; measuring the voltage and/or current of the power line by using the power transformer to obtain a voltage numeric value and/or current numeric value of a corresponding power line; and detecting the faults of the power line by using the voltage numeric value and/or current numeric value.
Description
Technical field
The present invention relates to a kind of fault monitoring method and system, relate in particular to a kind of fault monitoring method and system of power circuit, belong to the power technology field.
Background technology
Overhead power line is to adopt insulator electric wire to be fixed on the shaft tower that stands on ground circuit with electric energy transmitting.Overhead power line can be installed in city and rural area, and these circuits often are in street, the lane in city, the field in rural area, hillside.Because residing geographical environment of overhead power line and physical environment are comparatively abominable, form short circuit and earth fault easily; And generally also be when breaking down under atrocious weather, for example strong wind, thunderstorm etc. the time, this has brought great difficulty just for the electric power maintenance personal, causes the electric power maintenance personal to be difficult to find fast the trouble spot, can't rapidly removing faults.
At the problems referred to above, prior art has proposed a kind of On-line Fault monitoring technology, to realize the quick location of fault.This method is to utilize the switching devices such as fault detector that mount on the line to judge whether to break down.The variation tendency of electric current and voltage on the real-time Monitoring Line of this fault detector in case the phenomenon of the variation tendency of finding electric current and voltage during with fault is consistent, just judges that this circuit breaks down.
Yet, also there is weak point in this scheme of prior art, for example, because fault detector is to mount on the line, the reference point that does not have voltage measurement, so fault detector can't accurately measure the voltage value of circuit reality, and can only be by rising of electric field induction mode measuring voltage or the variation tendency that reduces, utilize this variation tendency monitoring fault, thereby cause the accuracy of existing scheme failure judgement lower, and can only monitor out short trouble and earth fault, the generation that causes the wrong report fault easily or fail to report phenomenon of the failure, can't rapidly removing faults, can not satisfy actual needs.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of fault monitoring method and system of power circuit, can monitor polytype line fault exactly, get rid of line fault fast, the generation of having avoided the wrong report fault or having failed to report phenomenon of the failure, improve the accuracy rate of malfunction monitoring, satisfied actual needs.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
The embodiment of the invention provides a kind of fault monitoring method of power circuit, comprising: electric power mutual-inductor is arranged in the power circuit; Utilize described electric power mutual-inductor that the voltage and/or the electric current of power circuit are measured, obtain the voltage value and/or the current values of corresponding power circuit; Utilize described voltage value and/or current values that the fault of power circuit is monitored.
The embodiment of the invention also provides a kind of fault monitoring system of overhead power line, and described system comprises electric power mutual-inductor, main control system and the supply transformer on the shaft tower that is arranged on overhead power line;
Described electric power mutual-inductor is used for the voltage and/or the electric current of overhead power line are measured, and obtains measurement result;
Described main control system, be connected to described electric power mutual-inductor, be used to utilize the measurement result of described electric power mutual-inductor, obtain the voltage value and/or the current values of corresponding overhead power line, and utilize described voltage value and/or current values that the fault of overhead power line is monitored;
Described supply transformer is connected to described main control system, is used for the high-tension electricity on the overhead power line is converted to low tension, to provide required working power to described main control system.
The embodiment of the invention also provides a kind of fault monitoring system of cable line, and described system comprises electric power mutual-inductor, main control system and the power module that is arranged in the ring main unit;
Described electric power mutual-inductor is used for the voltage and/or the electric current of cable line are measured, and obtains measurement result; Described main control system, be connected to described electric power mutual-inductor, be used to utilize the measurement result of described electric power mutual-inductor, obtain the voltage value and/or the current values of respective cable circuit, and utilize described voltage value and/or current values that the fault of cable line is monitored; Described power module is connected to described main control system, is used for providing required working power to described main control system.
From the above mentioned, the technical scheme of the embodiment of the invention inserts electric power mutual-inductor in the power circuit, and mounting means is flexible, and does not need to install on the line the various switching devices that are used for malfunction monitoring, has reduced cost.The technical scheme of the embodiment of the invention is measured the voltage value and/or the current values of the reality on the power circuit by electric power mutual-inductor, solved prior art and only carried out the problem that malfunction monitoring brought by the variation tendency of measuring voltage rising or reduction, can monitor polytype line fault exactly, get rid of line fault fast, the generation of having avoided the wrong report fault or having failed to report phenomenon of the failure, improve the accuracy rate of malfunction monitoring, satisfied actual needs.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The fault monitoring method schematic flow sheet of a kind of power circuit that Fig. 1 provides for the embodiment of the invention one;
The fault monitoring system structural representation of a kind of overhead power line that Fig. 2 provides for the embodiment of the invention three;
The fault monitoring system structural representation of the another kind of overhead power line that Fig. 3 provides for the embodiment of the invention three.
Embodiment
Below in conjunction with accompanying drawing of the present invention, technical scheme of the present invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Prior art only raises by measuring voltage or the variation tendency of reduction is carried out the problem that malfunction monitoring brought in order to solve, and the embodiment of the invention one provides a kind of fault monitoring method of power circuit, and as shown in Figure 1, described method comprises:
11: electric power mutual-inductor is arranged in the power circuit;
12: utilize described electric power mutual-inductor that the voltage and/or the electric current of power circuit are measured, obtain the voltage value and/or the current values of corresponding power circuit;
13: utilize described voltage value and/or current values that the fault of power circuit is monitored.
Further, according to the type difference of the electric power mutual-inductor of choosing, concrete set-up mode is also different in above-mentioned steps 11.Electric power mutual-inductor has comprised two kinds in current transformer (CT) and voltage transformer (VT) (PT), is respectively applied for the current value and the magnitude of voltage of measuring circuit.Current transformer is the mode by electromagnetic coupled, and the big current conversion on the circuit is become little electric current, utilizes measurement mechanism wherein that current value is measured then.Current transformer has the parameter of a no-load voltage ratio, and for example 200/5, when the electric current on the circuit was 200A, the electric current of mutual inductor output was 5A in other words.The implementation of voltage transformer (VT) has three kinds: a kind of is electromagnetic transformer, and it utilizes the electromagnetic coupled mode, and high pressure is become low pressure, for measurement mechanism wherein magnitude of voltage is measured; Another kind is an electronic mutual inductor, and it can pass through the mode of electric resistance partial pressure or capacitance partial pressure, and measures the voltage after partial value; Also having a kind of is photo-electricity mutual-inductor, and it is changed by electric light, is voltage transitions light signal, then by measuring and handle the magnitude of voltage of circuit.Above-mentioned voltage value can be the three-phase voltage value, above-mentioned current values also can be the three-phase current value, the embodiment of the invention can utilize electric power mutual-inductor to measure the three-phase current and the magnitude of voltage of power circuit, the three-phase voltage of the reality that analysis to measure obtains and current value, and with the method that the three-phase data contrast mutually, accurately monitor the failure condition of power circuit.Be appreciated that the embodiment of the invention is not limited to only utilize three-phase voltage and current value to carry out the monitoring of fault, the electric parameters such as power, electric degree and harmonic wave on all right measuring circuit utilize these electric parameters that line fault is monitored.
From the above mentioned, the technical scheme of the embodiment of the invention inserts electric power mutual-inductor in the power circuit, and mounting means is flexible, and does not need to install on the line the various switching devices that are used for malfunction monitoring, has reduced cost.The technical scheme of the embodiment of the invention is measured the voltage value and/or the current values of the reality on the power circuit by electric power mutual-inductor, solved prior art and only carried out the problem that malfunction monitoring brought by the variation tendency of measuring voltage rising or reduction, can monitor polytype line fault exactly, get rid of line fault fast, the generation of having avoided the wrong report fault or having failed to report phenomenon of the failure, improve the accuracy rate of malfunction monitoring, satisfied actual needs.
The fault monitoring method of a kind of power circuit that the embodiment of the invention two is provided describes below, and described method comprises:
11: electric power mutual-inductor is inserted in the power circuit.
Be that example is described to adopt a kind of scene that can either measure the electronic mutual inductor that electric current again can measuring voltage in the embodiment of the invention.This electronic mutual inductor can have earth terminal, for example, when this electronic mutual inductor of choosing utilizes the mode measuring voltage of electric resistance partial pressure, need promptly be connected with earth terminal to an end ground connection of low resistance in low resistance one side.By the earth terminal of electric power mutual-inductor, be provided with a reference point of measuring electric parameter (as voltage or electric current), soon be set to reference point greatly, utilize the actual value of this reference point measuring voltage or electric current.
In the application of reality, to different power circuit systems electric power mutual-inductor can be set in different ways, for example, when described power circuit is overhead power line, electric power mutual-inductor is arranged on the shaft tower of overhead power line, the earth terminal of electric power mutual-inductor is passed through tower grounding, in this case, electric power mutual-inductor can be set directly on the shaft tower, and can be by the support of shaft tower or by being attached to the stability and the security of the stilt enhancing electric power mutual-inductor on the shaft tower, this mode has improved the utilization factor of existing resource, but be not limited to this, satisfying under the situation that electric power mutual-inductor has earth terminal (promptly can provide reference point), also can the electric power mutual-inductor series connection inserted overhead power line by other modes; Perhaps, when described power circuit is cable line, electric power mutual-inductor is arranged in the ring main unit of cable line, the series connection of the earth terminal of electric power mutual-inductor is inserted in the cable line, with the other end of electric power mutual-inductor by ring main unit ground connection.Under this mode, utilize ring main unit in the distribution cable circuit that the earth terminal of electric power mutual-inductor is set, to make full use of the existing resource in the distribution cable circuit.Consider that electric power mutual-inductor has certain volume and weight, when current transformer that adopts other types or voltage transformer (VT), also these mutual inductors can be provided with in shaft tower or the ring main unit.But be not limited thereto, small and exquisite for volume, the mutual inductor that weight is lighter if do not need earth terminal, also can be provided with on the line.
12: utilize described electric power mutual-inductor that the voltage and/or the electric current of power circuit are measured, obtain the voltage value and/or the current values of corresponding power circuit.
In step 12, when electric power mutual-inductor measures when being simulating signal, promptly measurement result be by simulating signal constitute the time, need be digital signal with described analog signal conversion, obtain the voltage value and/or the current values of corresponding power circuit.
Further, above-mentioned voltage value comprises the three-phase voltage numerical value of power circuit, above-mentioned current values comprises the three-phase current numerical value of power circuit, at this moment, the power circuit that need carry out malfunction monitoring comprises three-phase circuit, three-phase circuit can be a kind of by three simple sinusoidal electromotives that frequency is identical, amplitude is identical, phase place differs 120 degree each other as the circuit of power supply.
13: utilize described voltage value and/or current values that the fault of power circuit is monitored.
The embodiment of the invention can utilize electric power mutual-inductor to measure the three-phase electricity flow valuve and/or the magnitude of voltage of power circuit, the three-phase voltage of the reality that analysis to measure obtains and current value, and with the method that the three-phase data contrast mutually, accurately monitor the failure condition of power circuit.The embodiment of the invention in phase fault, overcurrent fault, singlephase earth fault, superpotential fault and the under-voltage fault one or more of the fault that can monitor.
Be appreciated that, the embodiment of the invention is not limited to only utilize three-phase voltage and current value to carry out the monitoring of fault, can also utilize described electric power mutual-inductor that in residual voltage, zero-sequence current and the zero sequence phasing degree of power circuit one or more are measured, obtain in residual voltage numerical value, zero-sequence current numerical value and the zero sequence phasing degree numerical value of corresponding power circuit one or more, and utilize one or more the faults in described residual voltage numerical value, zero-sequence current numerical value and the zero sequence phasing degree numerical value to monitor power circuit.
Further, when utilizing described voltage value and/or current values that the fault of power circuit is monitored, the scope of the electric pressure of being monitored can be from 6KV to 35KV.
From the above mentioned, the technical scheme of the embodiment of the invention inserts electric power mutual-inductor in the power circuit, and mounting means is flexible, and does not need to install on the line the various switching devices that are used for malfunction monitoring, has reduced cost.The technical scheme of the embodiment of the invention is provided with the reference point of voltage and/or current measurement by the earth terminal of electric power mutual-inductor, utilize this reference point to measure the voltage value and/or the current values of the reality on the power circuit, solved prior art and only carried out the problem that malfunction monitoring brought by the variation tendency of measuring voltage rising or reduction, can monitor polytype line fault exactly, get rid of line fault fast, the generation of having avoided the wrong report fault or having failed to report phenomenon of the failure, improve the accuracy rate of malfunction monitoring, satisfied actual needs.
The fault monitoring system of a kind of overhead power line that the embodiment of the invention three is provided describes below.
The fault monitoring system of a kind of overhead power line that the embodiment of the invention three provides, described system comprises electric power mutual-inductor, main control system and the supply transformer on the shaft tower that is arranged on overhead power line;
Described electric power mutual-inductor is used for the voltage and/or the electric current of overhead power line are measured, and obtains measurement result; Described main control system, be connected to described electric power mutual-inductor, be used to utilize the measurement result of described electric power mutual-inductor, obtain the voltage value and/or the current values of corresponding overhead power line, and utilize described voltage value and/or current values that the fault of overhead power line is monitored; Described supply transformer is connected to described main control system, is used for the high-tension electricity on the overhead power line is converted to low tension, to provide required working power to described main control system.The technical scheme of the embodiment of the invention inserts electric power mutual-inductor in the power circuit, and mounting means is flexible, and does not need to install on the line the various switching devices that are used for malfunction monitoring, has reduced cost.The technical scheme of the embodiment of the invention is measured the voltage value and/or the current values of the reality on the power circuit by electric power mutual-inductor, solved prior art and only carried out the problem that malfunction monitoring brought by the variation tendency of measuring voltage rising or reduction, can monitor polytype line fault exactly, get rid of line fault fast, the generation of having avoided the wrong report fault or having failed to report phenomenon of the failure, improve the accuracy rate of malfunction monitoring, satisfied actual needs.
Further, described electric power mutual-inductor can have earth terminal, with the earth terminal of described electric power mutual-inductor by described tower grounding.Described electric power mutual-inductor is used for the three-phase voltage and/or the three-phase current of overhead power line are measured, and obtains the measurement result that is made of simulating signal; Described main control system, specifically being used for described analog signal conversion is digital signal, obtain the three-phase voltage numerical value and/or the three-phase current numerical value of corresponding overhead power line, and according to predetermined algorithm, three-phase voltage numerical value and/or three-phase current numerical value are compared mutually, the fault of overhead power line is monitored according to comparison result.This main control system can utilize the CPU that is arranged at wherein to carry out aforesaid operations.Further, described main control system specifically is used for according to described voltage value and/or current values following at least a fault or its combination of overhead power line being monitored: phase fault, overcurrent fault, singlephase earth fault, superpotential fault and under-voltage fault.
Utilize the shaft tower of overhead power line that the earth terminal of voltage or current measurement is set in the embodiment of the invention, not only can obtain measurement effect preferably, and make full use of existing resources, have stronger practicality.The difference of the type of Jian Ce overhead power line as required, the concrete method to set up of electric power mutual-inductor are also different.
Referring to Fig. 2, shown a kind of system architecture synoptic diagram that basic routing line on the overhead power line is monitored.In scene shown in Figure 2, parameters of electric power for three-phases such as the three-phase voltage of measuring overhead power line and/or three-phase currents, adopted three electric power mutual-inductors respectively three basic routing lines to be monitored, can while measuring voltage value and current value at this each electric power mutual-inductor of choosing.Be appreciated that and when adopting the electric power mutual-inductor of " three-phase integrated ", promptly adopt in the time of to measure the electric power mutual-inductor of three-phase power parameter simultaneously, an electric power mutual-inductor with this function can only be set measure corresponding parameters of electric power.Three basic routing lines 9 are separately positioned on the top of shaft tower by the support of an easy fork shape among Fig. 2, and three electric power mutual-inductors 1 are separately positioned on the top of head of mast basic routing line 9.Be provided with the support 4 of a special use below the head of mast, supply transformer 2 is arranged on the support 4, and this support has guaranteed to insulate between supply transformer 2 and shaft tower and the power circuit, can not influence each other.Supply transformer 2 is wired on the power circuit, obtaining high voltage electric energy, and high voltage electric energy is converted to low-voltage electric energy, to provide its work required power supply to main control system 3.Also can on shaft tower, special-purpose support be set for main control system; be used for fixing main control system 3; perhaps; directly by annular link 5 main control system 5 being fixed on the associated tracks of main control system 3 on the shaft tower, supply transformer 2 and electric power mutual-inductor 1 can be by carrying out cabling in the plastic cement pipe on the shaft tower, so that associated tracks is played a protective role.Usually main control system 3, supply transformer 2 and electric power mutual-inductor 1 are arranged on the upper part of shaft tower,, improve the security of equipment with destruction and the damage that reduces outer these equipment of bound pair.Because Fig. 2 is exemplary, and shaft tower has higher height in practice usually, so represent to omit the appropriate section of shaft tower with the breaking portion on the shaft tower.
Referring to Fig. 3, shown a kind of system architecture synoptic diagram that overhead power line top set circuit is monitored.The mounting means of electric power mutual-inductor is different from the mounting means of electric power mutual-inductor when basic routing line monitored when branched line is monitored.Because the numerical value that electric power mutual-inductor is measured electric parameter need be installed on branched line, and basic routing line 9 is arranged on the top of shaft tower usually, so the lower position in the head of mast is provided with a special stand 4, described branched line 8 utilizes described special stand 4 to be connected with the basic routing line 9 of head of mast, for example, branched line is connected to respectively on the special stand 4, by the extended lead of branched line branched line and basic routing line is coupled together then.Referring to Fig. 3, be provided with wire clamp 6 in the end of three branched line 8 extended leads, the lead by this extension is connected branched line with wire clamp 6 with basic routing line.Electric power mutual-inductor 1 is arranged on the top of described special stand 4 top set's circuits 8, electric power mutual-inductor can also play the effect of insulator in embodiments of the present invention, basic routing line is not provided with electric power mutual-inductor in the scene shown in Figure 3 and carries out malfunction monitoring, so on basic routing line, still insulator 7 need be set, carry out malfunction monitoring and on branched line, be provided with electric power mutual-inductor, then need not for branched line insulator to be set again.Supply transformer 2 also is provided with on the special stand 4, and this special stand needs can guarantee to insulate between supply transformer 2 and shaft tower and the power circuit, can not influence each other.Main control system 5 is fixed on the shaft tower by annular link 5.Some contents among Fig. 3 also can be with reference to the scene among the figure 2, as represent to omit the appropriate section of shaft tower with the breaking portion on the shaft tower.
Further, described main control system can also comprise communication module, is used for when judging that according to described comparison result corresponding overhead power line breaks down failure message being transferred to long-range control end by corresponding circuit.
Can choose dissimilar electric power mutual-inductors as required, for example, when needing the magnitude of voltage of measuring circuit, the electric power mutual-inductor that is adopted comprises electromagnetic transformer, a kind of or its combination in electronic mutual inductor and the photo-electricity mutual-inductor.
Than the mode that the available technology adopting fault detector is monitored, the scheme of the embodiment of the invention can accurately be measured three-phase current and voltage signal, and can compare three-phase signal synchronously, reaches the effect of quick fault location.And the embodiment of the invention is the parameters such as zero-sequence current, residual voltage and zero sequence phasing degree of measuring circuit further, and by the processing to these parameters, fault that can precise monitoring circuit generation single-phase earthing solves the difficult problem in the electrical production.
Based on being installed, on the line various switches monitor the mode of fault in the prior art, as utilize the on-pole switch combination in conjunction with feeder line terminal unit (Feeder Terminal Unit, FTU) monitor the mode of fault, electric power mutual-inductor in this programme is realized by a separate equipment, by electric power mutual-inductor, newly-increased main control system and supply transformer line fault is monitored, the work of electric power mutual-inductor and main control system does not rely on the operation of switch, has reduced the rate of breakdown of system.The technical program does not need to install on the line switch, and it is also very flexible that the mode of electric power mutual-inductor is installed, and invests for a short time, and cost is low.Be appreciated that when FTU can realize the function of main control system in this programme this programme can utilize also independently that electric power mutual-inductor comes fault is monitored in conjunction with the mode of FTU.
The embodiment of the invention can be applied to the malfunction monitoring of distribution overhead power line and distribution cable circuit, and the voltage range that can monitor can be from 6KV to 35KV.
From the above mentioned, the technical scheme of the embodiment of the invention inserts the electric power mutual-inductor series connection in the power circuit, and mounting means is flexible, and does not need to install on the line the various switching devices that are used for malfunction monitoring, has reduced cost.The technical scheme of the embodiment of the invention is provided with the reference point of voltage and/or current measurement by the earth terminal of electric power mutual-inductor, utilize this reference point to measure the voltage value and/or the current values of the reality on the power circuit, solved prior art and only carried out the problem that malfunction monitoring brought by the variation tendency of measuring voltage rising or reduction, can monitor polytype line fault exactly, get rid of line fault fast, the generation of having avoided the wrong report fault or having failed to report phenomenon of the failure, improve the accuracy rate of malfunction monitoring, satisfied actual needs.
The embodiment of the invention four provides a kind of fault monitoring system of cable line, and described system comprises electric power mutual-inductor, main control system and the power module that is arranged in the ring main unit;
Described electric power mutual-inductor is used for the voltage and/or the electric current of cable line are measured, and obtains measurement result; Described main control system, be connected to described electric power mutual-inductor, be used to utilize the measurement result of described electric power mutual-inductor, obtain the voltage value and/or the current values of respective cable circuit, and utilize described voltage value and/or current values that the fault of cable line is monitored; Described power module is connected to described main control system, is used for providing required working power to described main control system.When described electric power mutual-inductor has earth terminal, can be by ring main unit with this earth terminal ground connection.
In the invention process four in the principle of fault monitoring system and the embodiment of the invention three principle of fault monitoring system similar substantially, the key distinction is and need adjusts accordingly based on the concrete structure and the characteristic of cable line.For example, in the present embodiment, electric power mutual-inductor has been installed in the ring main unit, and the concrete mode of power module power supply also has been not limited to power taking from the cable.
The technical scheme of the embodiment of the invention inserts electric power mutual-inductor in the power circuit, and mounting means is flexible, and does not need to install on the line the various switching devices that are used for malfunction monitoring, has reduced cost.The technical scheme of the embodiment of the invention is measured the voltage value and/or the current values of the reality on the power circuit by electric power mutual-inductor, solved prior art and only carried out the problem that malfunction monitoring brought by the variation tendency of measuring voltage rising or reduction, can monitor polytype line fault exactly, get rid of line fault fast, the generation of having avoided the wrong report fault or having failed to report phenomenon of the failure, improve the accuracy rate of malfunction monitoring, satisfied actual needs.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by described protection domain with claim.
Claims (10)
1. the fault monitoring method of a power circuit is characterized in that, described method comprises:
Electric power mutual-inductor is arranged in the power circuit;
Utilize described electric power mutual-inductor that the voltage and/or the electric current of power circuit are measured, obtain the voltage value and/or the current values of corresponding power circuit;
According to described voltage value and/or current values,, the fault of power circuit is monitored according to certain fault distinguishing algorithm.
2. method according to claim 1 is characterized in that, describedly utilizes described electric power mutual-inductor that the voltage and/or the electric current of power circuit are measured, and the voltage value and/or the current values that obtain corresponding power circuit comprise:
Utilize described electric power mutual-inductor that the voltage and/or the electric current of power circuit are measured, obtain the measurement result that constitutes by simulating signal;
With described analog signal conversion is digital signal, obtains the voltage value and/or the current values of corresponding power circuit.
3. method according to claim 1 and 2 is characterized in that,
Described voltage value comprises the three-phase voltage numerical value of power circuit, and described current values comprises the three-phase current numerical value of power circuit;
The electric power mutual-inductor that is adopted comprises current transformer and/or voltage transformer (VT), and described voltage transformer (VT) comprises electromagnetic transformer, a kind of or its combination in electronic mutual inductor and the photo-electricity mutual-inductor;
When utilizing described voltage value and/or current values that the fault of power circuit is monitored, the scope of the electric pressure of being monitored is from 6KV to 35KV.
4. method according to claim 1 and 2 is characterized in that, described method also comprises:
Utilize described electric power mutual-inductor that residual voltage, zero-sequence current and the zero sequence phasing degree of power circuit are measured, obtain residual voltage numerical value, zero-sequence current numerical value and the zero sequence phasing degree numerical value of corresponding power circuit;
Utilize described residual voltage numerical value, zero-sequence current numerical value and zero sequence phasing degree numerical value that the fault of power circuit is monitored.
5. method according to claim 1 and 2 is characterized in that, according to described voltage value and/or current values following at least a fault or its combination of overhead power line is monitored:
Phase fault, overcurrent fault, singlephase earth fault, superpotential fault and under-voltage fault.
6. the fault monitoring system of an overhead power line is characterized in that, described system comprises electric power mutual-inductor, main control system and the supply transformer on the shaft tower that is arranged on overhead power line;
Described electric power mutual-inductor is used for the voltage and/or the electric current of overhead power line are measured, and obtains measurement result;
Described main control system, be connected to described electric power mutual-inductor, be used to utilize the measurement result of described electric power mutual-inductor, obtain the voltage value and/or the current values of corresponding overhead power line, and utilize described voltage value and/or current values that the fault of overhead power line is monitored;
Described supply transformer is connected to described main control system, is used for the high-tension electricity on the overhead power line is converted to low tension, to provide required working power to described main control system.
7. system according to claim 6 is characterized in that,
Described electric power mutual-inductor is used for the three-phase voltage and/or the three-phase current of overhead power line are measured, and obtains the measurement result that is made of simulating signal;
Described main control system, specifically being used for described analog signal conversion is digital signal, obtain the three-phase voltage numerical value and/or the three-phase current numerical value of corresponding overhead power line, and according to predetermined algorithm, three-phase voltage numerical value and/or three-phase current numerical value are compared mutually, the fault of overhead power line is monitored according to comparison result;
Described main control system also comprises communication module, is used for when judging that according to described comparison result corresponding overhead power line breaks down failure message being transferred to long-range control end by corresponding circuit.
8. according to claim 6 or 7 described systems, it is characterized in that,
Described electric power mutual-inductor is realized by separate equipment.
9. according to claim 6 or 7 described systems, it is characterized in that,
When the basic routing line of overhead power line is monitored, electric power mutual-inductor is arranged on the top of head of mast basic routing line, supply transformer is arranged on the set special stand of the lower position of head of mast;
When the branched line of overhead power line is monitored, lower position in the head of mast is provided with special stand, described branched line utilizes described special stand to be connected with the basic routing line of head of mast, electric power mutual-inductor is arranged on the top of described special stand top set circuit, supply transformer is arranged on this special stand.
10. according to claim 6 or 7 described systems, it is characterized in that,
Described main control system specifically is used for according to described voltage value and/or current values following at least a fault or its combination of overhead power line being monitored:
Phase fault, overcurrent fault, singlephase earth fault, superpotential fault and under-voltage fault.
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| CN 201110034050 CN102135587A (en) | 2011-01-31 | 2011-01-31 | Fault monitoring method and system of power line |
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| CN 201110034050 CN102135587A (en) | 2011-01-31 | 2011-01-31 | Fault monitoring method and system of power line |
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| CN 201110034050 Pending CN102135587A (en) | 2011-01-31 | 2011-01-31 | Fault monitoring method and system of power line |
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| CN105988063A (en) * | 2015-03-16 | 2016-10-05 | 武汉三相电力科技有限公司 | Power transmission line fault hidden risk integrated on-line monitoring method and device |
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| CN109950862B (en) * | 2018-11-22 | 2021-01-29 | 深圳供电局有限公司 | Self-adaptive current fixed value setting method |
| CN109950862A (en) * | 2018-11-22 | 2019-06-28 | 深圳供电局有限公司 | Self-adaptive current fixed value setting method |
| CN109782085A (en) * | 2018-12-06 | 2019-05-21 | 安徽凯川电力保护设备有限公司 | A kind of trouble hunting of power equipment is from declaration method |
| CN110716080A (en) * | 2019-10-11 | 2020-01-21 | 国网福建省电力有限公司泉州供电公司 | High-voltage transmission line three-phase voltage harmonic synchronous detection method |
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