CN103163416B - Method and device for detecting branch circuit single phase earth faults - Google Patents
Method and device for detecting branch circuit single phase earth faults Download PDFInfo
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- CN103163416B CN103163416B CN201310106746.6A CN201310106746A CN103163416B CN 103163416 B CN103163416 B CN 103163416B CN 201310106746 A CN201310106746 A CN 201310106746A CN 103163416 B CN103163416 B CN 103163416B
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 230000001143 conditioned effect Effects 0.000 claims description 38
- 238000012544 monitoring process Methods 0.000 claims description 23
- 230000007935 neutral effect Effects 0.000 description 27
- 238000010586 diagram Methods 0.000 description 10
- 230000015556 catabolic process Effects 0.000 description 5
- 230000008033 biological extinction Effects 0.000 description 4
- 230000001629 suppression Effects 0.000 description 3
- 238000012163 sequencing technique Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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Abstract
The invention provides a method and a device for detecting branch circuit single phase earth faults. The method includes: obtaining a first electric current in a branch circuit; judging whether the first electric current is not less than a preset electric current so as to obtain a first judging result; judging whether the first electric current satisfies a preset condition so as to obtain a second judging result; determining that single phase earth faults occur on the load side of the branch circuit when the first judging result states clearly that the first electric current is not less than the preset electric current and the second judging result states clearly that the first electric current dissatisfies the preset condition; and determining that the single phase earth faults occur on the power source side of the branch circuit when the first judging result states clearly that the first electric current is less than the preset electric current and the second judging result states clearly that the first electric current dissatisfies the preset condition. Specific fault positions of the branch circuit can be obtained by using the method and the device, and accordingly detection personnel can quickly remove the faults conveniently.
Description
Technical field
The present invention relates to automation field, in particular, relate to a kind of branched line single-phase earth fault detecting method and device.
Background technology
Along with developing rapidly of electrical network, the reliability requirement that people power to power distribution system secure is more and more higher, and the connected mode of the electrical network in distribution system of the prior art is that isolated neutral mode, neutral by arc extinction coil grounding mode or neutral point are through small current neutral grounding mode.
When distribution system generation single-phase earthing, the line distribution capacitance electric current of single-phase earth fault current reflection is often very little, the symmetry of distribution system line voltage is destroyed, electrical network is still allowed to continue to run a period of time, regulations stipulate is generally 1h ~ 2h, for preventing distribution system fault spread, at distribution system generation singlephase earth fault and still continue run during this period of time in must distinguish as early as possible and get rid of singlephase earth fault.
Refer to the structural representation that Fig. 1 is prior art one distribution line, demarcation switch K1, demarcation switch K2, demarcation switch K3, master switch K0, load 1, load 2 and load 3.Distribution line in Fig. 1 comprises three branched lines, each branched line comprises a demarcation switch and a load, when a branched line generation singlephase earth fault in distribution line, this branched line generation singlephase earth fault can only be detected, and demarcation switch load side or demarcation switch mains side generation singlephase earth fault specifically can not be detected, thus the position of concrete singlephase earth fault can not be detected fast, cause testing staff not fix a breakdown fast.Demarcation switch load side refers to the side that demarcation switch is connected with load, and demarcation switch mains side refers to the side that demarcation switch is connected with electrical network.
Summary of the invention
In view of this, the invention provides a kind of branched line single-phase earth fault detecting method and device, to overcome in prior art due to the position of singlephase earth fault concrete in branched line can not be detected fast, cause the problem that testing staff can not fix a breakdown fast.
For achieving the above object, the invention provides following technical scheme:
A kind of branched line single-phase earth fault detecting method, comprising:
Obtain the first electric current in branched line;
Judge whether described first electric current is not less than predetermined current, obtains the first judged result;
Judge whether described first electric current meets pre-conditioned, obtains the second judged result;
Show that described first electric current is not less than described predetermined current in described first judged result, and described second judged result show described first electric current do not meet described pre-conditioned time, determine described branched line load side generation singlephase earth fault;
Show that described first electric current is less than described predetermined current in described first judged result, and described second judged result show described first electric current do not meet described pre-conditioned time, determine described branched line mains side generation singlephase earth fault.
Preferably, described determine described branched line load side generation singlephase earth fault after, also comprise:
Control the demarcation switch disjunction in described branched line.
Preferably, described determine described branched line mains side generation singlephase earth fault after, also comprise:
Control the master switch disjunction of the distribution line at described branched line place.
Preferably, described determine described branched line load side generation singlephase earth fault after, also comprise:
The information of described branched line load side generation singlephase earth fault is sent to monitoring server.
Preferably, after the described information by described branched line load side generation singlephase earth fault is sent to monitoring server, also comprise:
Receive after the instruction of the demarcation switch disjunction controlled described branched line from described monitoring server, control described demarcation switch disjunction.
A kind of branched line phase-to-ground fault detection device, comprising:
Obtain module, for obtaining the first electric current in branched line;
First judge module, for judging whether described first electric current is not less than predetermined current, obtains the first judged result;
Second judge module, for judging whether described first electric current meets pre-conditioned, obtains the second judged result;
First determination module, for showing that described first electric current is not less than described predetermined current in described first judged result, and described second judged result show described first electric current do not meet described pre-conditioned time, determine described branched line load side generation singlephase earth fault;
Second determination module, for showing that described first electric current is less than described predetermined current in described first judged result, and described second judged result show described first electric current do not meet described pre-conditioned time, determine described branched line mains side generation singlephase earth fault.
Preferably, also comprise:
First control module, for determine described branched line load side generation singlephase earth fault at described first determination module after, controls the demarcation switch disjunction in described branched line.
Preferably, also comprise:
Second control module, for determine described branched line mains side generation singlephase earth fault at described second determination module after, controls the master switch disjunction in the distribution line at described branched line place.
Preferably, also comprise:
Sending module, for being sent to monitoring server by the information of described branched line load side generation singlephase earth fault.
Preferably, also comprise:
3rd control module, after controlling the instruction of the demarcation switch disjunction in described branched line from described monitoring server reception, controls described demarcation switch disjunction.
Known via above-mentioned technical scheme, compared with prior art, embodiments provide a kind of branched line single-phase earth fault detecting method, first judge whether the first electric current in branched line is not less than predetermined current, obtain the first judged result, judge whether the first electric current meets pre-conditioned, obtain the second judged result, show that described first electric current is not less than described predetermined current in described first judged result, and described second judged result show described first electric current do not meet described pre-conditioned time, determine described branched line load side generation singlephase earth fault, show that described first electric current is less than described predetermined current in described first judged result, and described second judged result show described first electric current do not meet described pre-conditioned time, determine described branched line mains side generation singlephase earth fault, the position of the concrete singlephase earth fault of branched line can be obtained by said method, like this can so that testing staff fixes a breakdown fast.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the structural representation of prior art one distribution line;
The schematic flow sheet of a kind of branched line single-phase earth fault detecting method that Fig. 2 provides for the embodiment of the present invention;
The method flow schematic diagram of a kind of another embodiment of branched line single-phase earth fault detecting method that Fig. 3 provides for the embodiment of the present invention;
The method flow schematic diagram of a kind of another embodiment of branched line single-phase earth fault detecting method that Fig. 4 provides for the embodiment of the present invention;
Fig. 5 is the schematic diagram of the isolated neutral connected mode of electrical network in prior art;
Fig. 6 is the schematic diagram of the neutral by arc extinction coil grounding connected mode of electrical network in prior art;
Fig. 7 is the schematic diagram of neutral point through small current neutral grounding connected mode of electrical network in prior art;
A kind of principle schematic adopting the detection branches line fault point under isolated neutral connected mode at electrical network that Fig. 8 provides for the embodiment of the present invention;
A kind of principle schematic adopting the detection branches line fault point under isolated neutral connected mode at electrical network that Fig. 9 provides for the embodiment of the present invention;
A kind of principle schematic adopting the detection branches line fault point of neutral point under arc suppression coil connected mode at electrical network that Figure 10 provides for the embodiment of the present invention;
The structural representation of a kind of branched line phase-to-ground fault detection device that Figure 11 provides for the embodiment of the present invention;
The structural representation of another embodiment of a kind of branched line phase-to-ground fault detection device that Figure 12 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, 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, belong to the scope of protection of the invention.
For the purpose of quoting and know, the explanation of the technical term hereinafter used, write a Chinese character in simplified form or abridge and be summarized as follows:
ZCT:Zero Current Transition, zero-current switching.
Refer to accompanying drawing 2, be the schematic flow sheet of a kind of branched line single-phase earth fault detecting method that the embodiment of the present invention provides, the method comprises:
Step S201: obtain the first electric current in branched line.
Step S202: judge whether the first electric current is not less than predetermined current, obtain the first judged result.
Step S203: judge whether the first electric current meets pre-conditioned, obtain the second judged result.
Pre-conditioned can be the alternate overcurrent condition of transformer.Electrical network can not be directly that load is powered by demarcation switch, and need the voltage of transformer to electrical network to change, above-mentioned transformer just refers to the transformer changed the voltage of electrical network.
Step S204: show that the first electric current is not less than predetermined current in the first judged result, and when the second judged result shows that the first electric current does not meet pre-conditioned, determine branched line load side generation singlephase earth fault.
Step S205: show that the first electric current is less than predetermined current in the first judged result, and when the second judged result shows that the first electric current does not meet pre-conditioned, determine branched line mains side generation singlephase earth fault.
The embodiment of the present invention, first judge whether the first electric current in branched line is not less than predetermined current, obtain the first judged result, judge whether the first electric current meets pre-conditioned, obtain the second judged result, show that the first electric current is not less than predetermined current in the first judged result, and the second judged result is when showing that the first electric current does not meet pre-conditioned, determine branched line load side generation singlephase earth fault, show that the first electric current is less than predetermined current in the first judged result, and the second judged result is when showing that the first electric current does not meet pre-conditioned, determine branched line mains side generation singlephase earth fault, the position of the concrete singlephase earth fault of branched line can be obtained by said method, like this can so that testing staff fixes a breakdown fast.
Refer to Fig. 3, be the method flow schematic diagram of a kind of another embodiment of branched line single-phase earth fault detecting method that the embodiment of the present invention provides, the method comprises:
Step S301: obtain the first electric current in branched line.
Step S302: judge whether the first electric current is not less than predetermined current, obtain the first judged result.
Step S303: judge whether the first electric current meets pre-conditioned, obtain the second judged result.
Step S304: show that the first electric current is not less than predetermined current in the first judged result, and when the second judged result shows that the first electric current does not meet pre-conditioned, determine branched line load side generation singlephase earth fault.
Step S305: control the demarcation switch disjunction in branched line.
In prior art when detecting that singlephase earth fault appears in a certain branched line, faulty line is excised by controlling master switch disjunction, for Fig. 1, when detecting that singlephase earth fault appears in the branched line at demarcation switch K1 place, then can gauge tap K0 disjunction, the user of demarcation switch K2 place branched line and the user of demarcation switch K3 place branched line will be affected like this, and the embodiment of the present invention only controls the demarcation switch disjunction in the branched line of generation singlephase earth fault, so the user on other branched lines can not be had influence on, thus reduce power failure range.
Step S306: show that the first electric current is not less than predetermined current in the first judged result, and when the second judged result shows that the first electric current does not meet pre-conditioned, determine branched line load side generation singlephase earth fault.
Step S304 and step S306 does not have sequencing.
Step S307: the master switch disjunction controlling the distribution line at branched line place.
Master switch in distribution line can be K0 as shown in Figure 1.
The method that the embodiment of the present invention provides, the demarcation switch disjunction in ACTIVE CONTROL branched line or ACTIVE CONTROL branched line place distribution line in master switch disjunction.
Refer to Fig. 4, be the method flow schematic diagram of a kind of another embodiment of branched line single-phase earth fault detecting method that the embodiment of the present invention provides, the method comprises:
Step S401: obtain the first electric current in branched line.
Step S402: judge whether the first electric current is not less than predetermined current, obtain the first judged result.
Step S403: judge whether the first electric current meets pre-conditioned, obtain the second judged result.
Step S404: show that the first electric current is not less than predetermined current in the first judged result, and when the second judged result shows that the first electric current does not meet pre-conditioned, determine branched line load side generation singlephase earth fault.
Preferably, after step S404, can also comprise: report to the police.
Step S405: the information of branched line load side generation singlephase earth fault is sent to monitoring server.
Step S406: receive after the instruction of the demarcation switch disjunction controlled branched line from monitoring server, control demarcation switch disjunction.
Step S406 is preferred step, and the embodiment of the present invention can not comprise this step.
Step S407: show that the first electric current is not less than predetermined current in the first judged result, and when the second judged result shows that the first electric current does not meet pre-conditioned, determine branched line load side generation singlephase earth fault.
Preferably, after step S407, can also comprise: report to the police.
Step S407 and step S404 does not have sequencing, at synchronization, may only S407 or only S404 in steps in steps, or S404 and step S407 in steps simultaneously.
Step S408: the information of branched line mains side generation singlephase earth fault is sent to monitoring server.
Monitoring server can be a long-range controller, testing staff can according to the information of the branched line that monitoring server presents, the master switch of the distribution line at each branched line or each branched line place is controlled, such as, when testing staff finds the information showing branched line 1 mains side generation singlephase earth fault in monitoring server, the instruction of the master switch disjunction in then can sending to branched line 1 distribution line controlling branched line 1 place by monitoring server, or monitoring server is according to each information received, corresponding demarcation switch and master switch are operated accordingly.
Step S409: after the instruction of the master switch disjunction from monitoring server receives the distribution line controlling branched line place, control this master switch disjunction.
Step S409 is preferred step, and the embodiment of the present invention can not have this step.
Above-mentioned either method embodiment goes for the isolated neutral connected mode of electrical network, neutral by arc extinction coil grounding connected mode or neutral point through small current neutral grounding connected mode, carries out principle explanation below,
Referring to Fig. 5, is the schematic diagram of the isolated neutral connected mode of electrical network in prior art.
Referring to Fig. 6, is the schematic diagram of the neutral by arc extinction coil grounding connected mode of electrical network in prior art.
Neutral point is by inductance L ground connection as can be seen from Figure 6.
Refer to Fig. 7, for the neutral point of electrical network in prior art is through the schematic diagram of small current neutral grounding connected mode.
As can be seen from Figure 7 neutral point is by resistance R0 ground connection.
General neutral point through the single-phase earth fault current of small current neutral grounding mode at 300A ~ 500A, when the load side generation single-phase earthing of branched line, the first electric current I 01 detected is whole ground currents, and when the mains side generation singlephase earth fault of branched line, the first electric current detected is I02, I02 is partial earth electric current, so I01 is greater than I02, so can using arbitrary I01 of being less than and the electric current being greater than I02 as predetermined current.
Due to Fig. 5, Fig. 6 with Figure 7 shows that prior art so do not repeat them here.
Referring to Fig. 8, is a kind of principle schematic adopting the detection branches line fault point under isolated neutral connected mode at electrical network that the embodiment of the present invention provides.
In Fig. 8, side, electric capacity C1 place is branched line mains side, electric capacity C2 is the pole line and cable capacitance summation relatively that comprise in branched line load side line, electric capacity C1 is the capacitance summation relatively of pole line and the cable comprised in branched line mains side circuit, and the ZCT in the demarcation switch K4 shown in Fig. 8 can detect the first electric current.
When the position of breaking down is position, trouble spot 1, the position of namely breaking down is branched line load side, and now the first electric current is I01=3 ω U0C1, and wherein U0 is line voltage, and ω is the frequency of line voltage.
Referring to Fig. 9, is a kind of principle schematic adopting the detection branches line fault point under isolated neutral connected mode at electrical network that the embodiment of the present invention provides.
Electric capacity C1 in Fig. 9 is the capacitance summation relatively of pole line for comprising in branched line mains side circuit and cable, electric capacity C2 is the pole line and cable capacitance summation relatively that comprise in branched line load side line, and the ZCT in the demarcation switch K4 shown in Fig. 9 can detect the first electric current.
When the position of breaking down is position, trouble spot 2, the position of namely breaking down is branched line mains side, and now the first electric current is I02=3 ω U0C2, and wherein U0 is line voltage, and ω is the frequency of line voltage.
From I01=3 ω U0C1 and I02=3 ω U0C2, when C1 is far longer than C2, I01 is far longer than I02, as can be seen here, for the distribution line that electrical network is isolated neutral connected mode, when singlephase earth fault occurs in branched line mains side, the electric current I 01 detected is far longer than the electric current I 02 detected when singlephase earth fault occurs in branched line load side, thus can using arbitrary I01 of being less than and the electric current being greater than I02 as predetermined current.
Referring to Figure 10, is a kind of principle schematic adopting the detection branches line fault point of neutral point under arc suppression coil connected mode at electrical network that the embodiment of the present invention provides.
ZCT in demarcation switch K4 shown in Figure 10 can detect the first electric current.
According to the first electric current that the ZCT in the polar plot demarcation switch in Figure 10 detects be: I'
01=I
01-I
l, wherein I
01for the whole network capacitance current effective value except C2, I
lfor the effective value of arc suppression coil compensation electric current.
I'
01size and Orientation change with compensation way, but in general, tuning-off degree should be not less than 10%, therefore, I'
01>=0.1I
01, when C1 is much larger than (0.1C1 is greater than C2 significantly) when C2, still have I'
01much larger than I02, thus can using arbitrary I01 of being less than and the electric current being greater than I02 as predetermined current.
As can be seen from the analysis of above three kinds of ground connection methods of operation, when branched line mains side electric capacity C1 is relatively much larger than (C1 is the hundreds of of C2 and even thousands of times in actual applications) when branched line load side electric capacity C2 relatively, can arrange that to be less than the electric current that I01 is greater than I02 be predetermined current I0set.
When arranging predetermined current I0set, also need consideration safety factor and margin of safety, as got I0set=2I02.If branched line load side circuit is cable, then C2 value obviously increases (because cable electric capacity is relatively greater than pole line electric capacity relatively), now need according to after actual cable capacitance calculation I01 value and I02 value, whether the relation between checking I02, I0set and I01 three meets I02 < I0set < I01, to guarantee the position of selecting properly singlephase earth fault.
Describe method in detail in embodiment disclosed in the invention described above, the device of various ways can be adopted to realize for method of the present invention, therefore the invention also discloses multiple device, provide specific embodiment below and be described in detail.
Refer to Figure 11, for the structural representation of a kind of branched line phase-to-ground fault detection device that the embodiment of the present invention provides, this device comprises: obtain module 1101, first judge module 1102, second judge module 1103, first determination module 1104 and the second determination module 1105, wherein:
Obtain module 1101, for obtaining the first electric current in branched line.
First judge module 1102, for judging whether described first electric current is not less than predetermined current, obtains the first judged result.
Second judge module 1103, for judging whether described first electric current meets pre-conditioned, obtains the second judged result.
First determination module 1104, for showing that described first electric current is not less than described predetermined current in described first judged result, and described second judged result show described first electric current do not meet described pre-conditioned time, determine described branched line load side generation singlephase earth fault.
Second determination module 1105, for showing that described first electric current is less than described predetermined current in described first judged result, and described second judged result show described first electric current do not meet described pre-conditioned time, determine described branched line mains side generation singlephase earth fault.
The embodiment of the present invention, first judge whether the first electric current obtained in the branched line of module 1101 acquisition is not less than predetermined current by the first judge module 1102, obtain the first judged result, judge whether the first electric current meets by the second judge module 1103 pre-conditioned, obtain the second judged result, show that the first electric current is not less than predetermined current in the first judged result, and the second judged result is when showing that the first electric current does not meet pre-conditioned, first determination module 1104 determines branched line load side generation singlephase earth fault, show that the first electric current is less than predetermined current in the first judged result, and the second judged result is when showing that the first electric current does not meet pre-conditioned, second determination module 1105 determines branched line mains side generation singlephase earth fault, the position of the concrete singlephase earth fault of branched line can be obtained by said method, like this can so that testing staff fixes a breakdown fast.
Refer to Figure 12, the structural representation of another embodiment of a kind of branched line phase-to-ground fault detection device provided for the embodiment of the present invention, this device comprises:
Obtain module 1101, first judge module 1102, second judge module 1103, first determination module 1104, second determination module 1105 and the first control module 1201, wherein
Obtain module 1101, for obtaining the first electric current in branched line.
First judge module 1102, for judging whether described first electric current is not less than predetermined current, obtains the first judged result.
Second judge module 1103, for judging whether described first electric current meets pre-conditioned, obtains the second judged result.
First determination module 1104, for showing that described first electric current is not less than described predetermined current in described first judged result, and described second judged result show described first electric current do not meet described pre-conditioned time, determine described branched line load side generation singlephase earth fault.
Preferably, the embodiment of the present invention can also comprise sending module, for the information of described branched line load side generation singlephase earth fault is sent to monitoring server.
The embodiment of the present invention can also comprise the 3rd control module, after controlling the instruction of the demarcation switch disjunction in described branched line from described monitoring server reception, controls described demarcation switch disjunction.
First control module 1201, for determine described branched line load side generation singlephase earth fault at the first determination module 1104 after, controls the demarcation switch disjunction in described branched line.
Second determination module 1105, for showing that described first electric current is less than described predetermined current in described first judged result, and described second judged result show described first electric current do not meet described pre-conditioned time, determine described branched line mains side generation singlephase earth fault.
The embodiment of the present invention can also comprise the second control module 1202, for determine described branched line mains side generation singlephase earth fault at the second determination module 1105 after, controls the master switch disjunction in the distribution line at described branched line place.
The embodiment of the present invention can also comprise the second sending module, for the information of described branched line mains side generation singlephase earth fault is sent to monitoring server.
The embodiment of the present invention can also comprise the 4th control module, after controlling the instruction of the master switch disjunction in the distribution line at described branched line place from described monitoring server reception, controls described master switch disjunction.
It should be noted that, each embodiment in this instructions all adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar part mutually see.For device or system class embodiment, due to itself and embodiment of the method basic simlarity, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.
Also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
The software module that the method described in conjunction with embodiment disclosed herein or the step of algorithm can directly use hardware, processor to perform, or the combination of the two is implemented.Software module can be placed in the storage medium of other form any known in random access memory (RAM), internal memory, ROM (read-only memory) (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a branched line single-phase earth fault detecting method, is characterized in that, comprising:
Obtain the first electric current in branched line;
Judge whether described first electric current is not less than predetermined current, obtains the first judged result;
Judge whether described first electric current meets pre-conditioned, obtains the second judged result;
Show that described first electric current is not less than described predetermined current in described first judged result, and described second judged result show described first electric current do not meet described pre-conditioned time, determine described branched line load side generation singlephase earth fault;
Show that described first electric current is less than described predetermined current in described first judged result, and described second judged result show described first electric current do not meet described pre-conditioned time, determine described branched line mains side generation singlephase earth fault;
Wherein, described pre-conditioned be the alternate overcurrent condition of transformer.
2. branched line single-phase earth fault detecting method according to claim 1, is characterized in that, described determine described branched line load side generation singlephase earth fault after, also comprise:
Control the demarcation switch disjunction in described branched line.
3. branched line single-phase earth fault detecting method according to claim 1, is characterized in that, described determine described branched line mains side generation singlephase earth fault after, also comprise:
Control the master switch disjunction of the distribution line at described branched line place.
4. branched line single-phase earth fault detecting method according to claim 1, is characterized in that, described determine described branched line load side generation singlephase earth fault after, also comprise:
The information of described branched line load side generation singlephase earth fault is sent to monitoring server.
5. branched line single-phase earth fault detecting method according to claim 4, is characterized in that, after the described information by described branched line load side generation singlephase earth fault is sent to monitoring server, also comprise:
Receive after the instruction of the demarcation switch disjunction controlled described branched line from described monitoring server, control described demarcation switch disjunction.
6. a branched line phase-to-ground fault detection device, is characterized in that, comprising:
Obtain module, for obtaining the first electric current in branched line;
First judge module, for judging whether described first electric current is not less than predetermined current, obtains the first judged result;
Second judge module, for judging whether described first electric current meets pre-conditioned, obtains the second judged result;
First determination module, for showing that described first electric current is not less than described predetermined current in described first judged result, and described second judged result show described first electric current do not meet described pre-conditioned time, determine described branched line load side generation singlephase earth fault;
Second determination module, for showing that described first electric current is less than described predetermined current in described first judged result, and described second judged result show described first electric current do not meet described pre-conditioned time, determine described branched line mains side generation singlephase earth fault;
Wherein, described pre-conditioned be the alternate overcurrent condition of transformer.
7. branched line phase-to-ground fault detection device according to claim 6, is characterized in that, also comprise:
First control module, for determine described branched line load side generation singlephase earth fault at described first determination module after, controls the demarcation switch disjunction in described branched line.
8. branched line phase-to-ground fault detection device according to claim 6, is characterized in that, also comprise:
Second control module, for determine described branched line mains side generation singlephase earth fault at described second determination module after, controls the master switch disjunction in the distribution line at described branched line place.
9. branched line phase-to-ground fault detection device according to claim 6, is characterized in that, also comprise:
Sending module, for being sent to monitoring server by the information of described branched line load side generation singlephase earth fault.
10. branched line phase-to-ground fault detection device according to claim 9, is characterized in that, also comprise:
3rd control module, after controlling the instruction of the demarcation switch disjunction in described branched line from described monitoring server reception, controls described demarcation switch disjunction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310106746.6A CN103163416B (en) | 2013-03-28 | 2013-03-28 | Method and device for detecting branch circuit single phase earth faults |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310106746.6A CN103163416B (en) | 2013-03-28 | 2013-03-28 | Method and device for detecting branch circuit single phase earth faults |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103163416A CN103163416A (en) | 2013-06-19 |
| CN103163416B true CN103163416B (en) | 2015-04-01 |
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| CN111273194B (en) * | 2020-04-01 | 2022-02-11 | 李晓明 | Extraction method, line selection method and system for small current ground fault quantity of transformer |
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