CN103163416A - 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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- CN103163416A CN103163416A CN2013101067466A CN201310106746A CN103163416A CN 103163416 A CN103163416 A CN 103163416A CN 2013101067466 A CN2013101067466 A CN 2013101067466A CN 201310106746 A CN201310106746 A CN 201310106746A CN 103163416 A CN103163416 A CN 103163416A
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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, people require more and more higher to the power distribution system secure power supply reliability, 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 the 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 still is allowed to continue operation a period of time, the rules regulation is generally 1h～2h, for preventing the distribution system fault spread, at distribution system generation singlephase earth fault and still continue operation during this period of time in must distinguish as early as possible and get rid of singlephase earth fault.
See also 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 the 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 can not specifically be detected, thereby can not detect fast the position of concrete singlephase earth fault, cause the testing staff not fix a breakdown fast.The demarcation switch load side refers to the side that demarcation switch is connected with load, and the 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 that can not detect fast singlephase earth fault concrete in branched line, the problem that causes the testing staff 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 comprises:
Obtain the first electric current in branched line;
Judge whether described the first electric current is not less than predetermined current, obtain the first judged result;
Judge whether described the first electric current satisfies pre-conditioned, obtain the second judged result;
Show that in described the first judged result described the first electric current is not less than described predetermined current, and described the second judged result to show that described the first electric current does not satisfy described when pre-conditioned, determine described branched line load side generation singlephase earth fault;
Show described the first electric current less than described predetermined current in described the first judged result, and described the second judged result to show that described the first electric current does not satisfy described when pre-conditioned, determine described branched line mains side generation singlephase earth fault.
Preferably, after described definite described branched line load side generation singlephase earth fault, also comprise:
Control the demarcation switch disjunction in described branched line.
Preferably, after described definite described branched line mains side generation singlephase earth fault, also comprise:
Control the master switch disjunction of the distribution line at described branched line place.
Preferably, after described definite described branched line load side generation singlephase earth fault, also comprise:
The information of described branched line load side generation singlephase earth fault is sent to monitoring server.
Preferably, after described information with described branched line load side generation singlephase earth fault is sent to monitoring server, also comprise:
After described monitoring server receives the indication of controlling the demarcation switch disjunction described branched line, control described demarcation switch disjunction.
A kind of branched line phase-to-ground fault detection device comprises:
Obtain module, be used for obtaining the first electric current of branched line;
The first judge module is used for judging whether described the first electric current is not less than predetermined current, obtains the first judged result;
The second judge module is used for judging whether described the first electric current satisfies pre-conditioned, obtains the second judged result;
The first determination module, be used for showing that in described the first judged result described the first electric current is not less than described predetermined current, and it is described when pre-conditioned that described the second judged result shows that described the first electric current does not satisfy, and determines described branched line load side generation singlephase earth fault;
The second determination module, be used for showing that in described the first judged result described the first electric current is less than described predetermined current, and it is described when pre-conditioned that described the second judged result shows that described the first electric current does not satisfy, and determines described branched line mains side generation singlephase earth fault.
Preferably, also comprise:
The first control module is used for controlling the demarcation switch disjunction in described branched line after described the first determination module is determined described branched line load side generation singlephase earth fault.
Preferably, also comprise:
The second control module is used for after described the second determination module is determined described branched line mains side generation singlephase earth fault, controls the master switch disjunction in the distribution line at described branched line place.
Preferably, also comprise:
Sending module is used for the information of described branched line load side generation singlephase earth fault is sent to monitoring server.
Preferably, also comprise:
The 3rd control module after being used for receiving the indication of the demarcation switch disjunction of controlling described branched line from described monitoring server, is controlled described demarcation switch disjunction.
via above-mentioned technical scheme as can be known, compared with prior art, the embodiment of the present invention provides a kind of branched line single-phase earth fault detecting method, at 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 satisfies pre-conditioned, obtain the second judged result, show that in described the first judged result described the first electric current is not less than described predetermined current, and it is described when pre-conditioned that described the second judged result shows that described the first electric current does not satisfy, determine described branched line load side generation singlephase earth fault, show that in described the first judged result described the first electric current is less than described predetermined current, and it is described when pre-conditioned that described the second judged result shows that described the first electric current does not satisfy, determine described branched line mains side generation singlephase earth fault, can obtain the position of the concrete singlephase earth fault of branched line by said method, like this can so that the testing staff fix a breakdown fast.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to the accompanying drawing that provides other accompanying drawing.
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 that the neutral point of electrical network in prior art is through the schematic diagram of small current neutral grounding connected mode;
A kind of principle schematic that adopts the detection branches line fault point under the isolated neutral connected mode at electrical network that Fig. 8 provides for the embodiment of the present invention;
A kind of principle schematic that adopts the detection branches line fault point under the isolated neutral connected mode at electrical network that Fig. 9 provides for the embodiment of the present invention;
A kind of principle schematic that adopts the detection branches line fault point of neutral point under the 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, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
For quote and know for the purpose of, the explanation of the technical term that hereinafter uses, write a Chinese character in simplified form or abridge and be summarized as follows:
ZCT:Zero Current Transition, the zero current conversion.
See also accompanying drawing 2, the schematic flow sheet of a kind of branched line single-phase earth fault detecting method that provides for the embodiment of the present invention, 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 satisfies pre-conditioned, obtain the second judged result.
Pre-conditionedly can be the alternate overcurrent condition of transformer.Electrical network can not be directly the load power supply by demarcation switch, needs transformer that the voltage of electrical network is changed, the transformer of above-mentioned transformer with regard to referring to the voltage of electrical network is changed.
Step S204: show that in the first judged result the first electric current is not less than predetermined current, and the second judged result shows that the first electric current does not satisfy when pre-conditioned, determines branched line load side generation singlephase earth fault.
Step S205: show the first electric current less than predetermined current in the first judged result, and the second judged result shows that the first electric current does not satisfy when pre-conditioned, determines branched line mains side generation singlephase earth fault.
the embodiment of the present invention, at 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 satisfies pre-conditioned, obtain the second judged result, show that in the first judged result the first electric current is not less than predetermined current, and the second judged result shows that the first electric current does not satisfy when pre-conditioned, determine branched line load side generation singlephase earth fault, show that in the first judged result the first electric current is less than predetermined current, and the second judged result shows that the first electric current does not satisfy when pre-conditioned, determine branched line mains side generation singlephase earth fault, can obtain the position of the concrete singlephase earth fault of branched line by said method, like this can so that the testing staff fix a breakdown fast.
See also Fig. 3, the method flow schematic diagram of a kind of another embodiment of branched line single-phase earth fault detecting method that provides for the embodiment of the present invention, 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 satisfies pre-conditioned, obtain the second judged result.
Step S304: show that in the first judged result the first electric current is not less than predetermined current, and the second judged result shows that the first electric current does not satisfy when pre-conditioned, determines branched line load side generation singlephase earth fault.
Step S305: control the demarcation switch disjunction in branched line.
in prior art when a certain branched line being detected and singlephase earth fault occurs, excise faulty line by controlling the master switch disjunction, take Fig. 1 as example, when singlephase earth fault appears in the branched line that demarcation switch K1 place detected, can gauge tap K0 disjunction, will affect like this user of demarcation switch K2 place branched line and the user of demarcation switch K3 place branched line, and the embodiment of the present invention is only controlled the demarcation switch disjunction in the branched line that singlephase earth fault occurs, so can not have influence on the user on other branched lines, thereby dwindled power failure range.
Step S306: show that in the first judged result the first electric current is not less than predetermined current, and the second judged result shows that the first electric current does not satisfy when pre-conditioned, determines branched line load side generation singlephase earth fault.
Step S304 and step S306 do not have sequencing.
Step S307: control the master switch disjunction of 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 master switch disjunction in the distribution line demarcation switch disjunction in the ACTIVE CONTROL branched line or ACTIVE CONTROL branched line place.
See also Fig. 4, the method flow schematic diagram of a kind of another embodiment of branched line single-phase earth fault detecting method that provides for the embodiment of the present invention, 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 satisfies pre-conditioned, obtain the second judged result.
Step S404: show that in the first judged result the first electric current is not less than predetermined current, and the second judged result shows that the first electric current does not satisfy when pre-conditioned, determines 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: after monitoring server receives the indication of controlling the demarcation switch disjunction branched line, control the demarcation switch disjunction.
Step S406 is preferred step, and the embodiment of the present invention can not comprise this step.
Step S407: show that in the first judged result the first electric current is not less than predetermined current, and the second judged result shows that the first electric current does not satisfy when pre-conditioned, determines branched line load side generation singlephase earth fault.
Preferably, after step S407, can also comprise: report to the police.
Step S407 and step S404 do not have sequencing, at synchronization, may be only S407 or only S404 in steps in steps, perhaps 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, the testing staff can be according to the information of the branched line that presents on monitoring server, master switch to the distribution line at each branched line or each branched line place is controlled, for example, when the testing staff finds in monitoring server to show the information of branched line 1 mains side generation singlephase earth fault, can send by monitoring server the indication of the master switch disjunction in the distribution line of controlling branched line 1 place to branched line 1, perhaps monitoring server is according to each information that receives, corresponding demarcation switch and master switch are operated accordingly.
Step S409: after monitoring server receives the indication of the master switch disjunction the distribution line of controlling the 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 isolated neutral connected mode, neutral by arc extinction coil grounding connected mode or the neutral point of electrical network through the small current neutral grounding connected mode, and the below carries out the principle explanation,
See also Fig. 5, be the schematic diagram of the isolated neutral connected mode of electrical network in prior art.
See also Fig. 6, be 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.
See also Fig. 7, be the neutral point of electrical network in the prior art schematic diagram through the small current neutral grounding connected mode.
As can be seen from Figure 7 neutral point is by resistance R 0 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 that detects is whole ground currents, and when the mains side generation singlephase earth fault of branched line, the first electric current that detects is I02, I02 is the partial earth electric current, thus I01 greater than I02, so can with arbitrary less than I01 and greater than the electric current of I02 as predetermined current.
Due to Fig. 5, Fig. 6 with Figure 7 shows that so prior art does not repeat them here.
See also Fig. 8, a kind of principle schematic that adopts the detection branches line fault point under the isolated neutral connected mode at electrical network that provides for the embodiment of the present invention.
In Fig. 8, capacitor C 1 place side is the branched line mains side, pole line and cable relatively the capacitance summation of capacitor C 2 for comprising in the branched line load side line, capacitor C 1 is the pole line that comprises in branched line mains side circuit and the capacitance summation relatively of cable, and the ZCT in demarcation switch K4 shown in Figure 8 can detect the first electric current.
When the position of breaking down is 1 position, trouble spot, the position of namely breaking down is the branched line load side, and this moment, the first electric current was I01=3 ω U0C1, and wherein U0 is line voltage, and ω is the frequency of line voltage.
See also Fig. 9, a kind of principle schematic that adopts the detection branches line fault point under the isolated neutral connected mode at electrical network that provides for the embodiment of the present invention.
Capacitor C 1 in Fig. 9 is for being the pole line that comprises in branched line mains side circuit and the capacitance summation relatively of cable, pole line and cable relatively the capacitance summation of capacitor C 2 for comprising in the branched line load side line, the ZCT in demarcation switch K4 shown in Figure 9 can detect the first electric current.
When the position of breaking down is 2 positions, trouble spot, the position of namely breaking down is the branched line mains side, and this moment, the first electric current was I02=3 ω U0C2, and wherein U0 is line voltage, and ω is the frequency of line voltage.
By I01=3 ω U0C1 and I02=3 ω U0C2 as can be known, when C1 is far longer than C2, I01 is far longer than I02, this shows, it is the distribution line of isolated neutral connected mode for electrical network, when singlephase earth fault occurred in the branched line mains side, the electric current I 01 that detects was far longer than the electric current I 02 that detects when singlephase earth fault occurs in the branched line load side, thus can with arbitrary less than I01 and greater than the electric current of I02 as predetermined current.
See also Figure 10, a kind of principle schematic that adopts the detection branches line fault point of neutral point under the arc suppression coil connected mode at electrical network that provides for the embodiment of the present invention.
ZCT in demarcation switch K4 shown in Figure 10 can detect the first electric current.
The first electric current that detects according to the ZCT in the polar plot demarcation switch in Figure 10 is: I'
01=I
01-I
L, I wherein
01Be the whole network capacitance current effective value except C2, I
LEffective value for the arc suppression coil compensation electric current.
I'
01Size and Orientation change with compensation way, but in general, take off humorous degree and should be not less than 10%, therefore, I'
01〉=0.1I
01, much larger than C2 the time (0.1C1 is significantly greater than C2), I' is arranged still as C1
01Much larger than I02, thus can with arbitrary less than I01 and greater than the electric current of I02 as predetermined current.
Analysis by three kinds of above ground connection methods of operation can be found out, when branched line mains side capacitor C 1 relatively much larger than relatively capacitor C 2 of branched line load side the time (C1 is the hundreds of of C2 and even thousands of times in actual applications), can arrange less than I01 is predetermined current I0set greater than the electric current of I02.
When predetermined current I0set is set, also needs to consider a safety factor and margin of safety, as get I0set=2I02.If branched line load side circuit is cable, the C2 value obviously increases (because cable electric capacity relatively is greater than pole line electric capacity relatively), after need to calculating I01 value and I02 value according to actual cable electric capacity this moment, whether the relation between checking I02, I0set and I01 three satisfies I02＜I0set＜I01, to guarantee the position of selecting properly singlephase earth fault.
Describe method in detail in the disclosed embodiment of the invention described above, can adopt the device of various ways to realize for method of the present invention, therefore the invention also discloses multiple device, the below provides specific embodiment and is elaborated.
See also Figure 11, the structural representation of a kind of branched line phase-to-ground fault detection device that provides for the embodiment of the present invention, this device comprises: obtain module 1101, the first judge module 1102, the second judge module 1103, the first determination module 1104 and the second determination module 1105, wherein:
Obtain module 1101, be used for obtaining the first electric current of branched line.
The first judge module 1102 is used for judging whether described the first electric current is not less than predetermined current, obtains the first judged result.
The second judge module 1103 is used for judging whether described the first electric current satisfies pre-conditioned, obtains the second judged result.
The first determination module 1104, be used for showing that in described the first judged result described the first electric current is not less than described predetermined current, and it is described when pre-conditioned that described the second judged result shows that described the first electric current does not satisfy, and determines described branched line load side generation singlephase earth fault.
The second determination module 1105, be used for showing that in described the first judged result described the first electric current is less than described predetermined current, and it is described when pre-conditioned that described the second judged result shows that described the first electric current does not satisfy, and determines described branched line mains side generation singlephase earth fault.
the embodiment of the present invention, at first whether be not less than predetermined current by the first electric current in the branched line of the first judge module 1102 judgement acquisition modules 1101 acquisitions, obtain the first judged result, judge by the second judge module 1103 whether the first electric current satisfies pre-conditioned, obtain the second judged result, show that in the first judged result the first electric current is not less than predetermined current, and the second judged result shows that the first electric current does not satisfy when pre-conditioned, the first determination module 1104 is determined branched line load side generation singlephase earth fault, show that in the first judged result the first electric current is less than predetermined current, and the second judged result shows that the first electric current does not satisfy when pre-conditioned, the second determination module 1105 is determined branched line mains side generation singlephase earth fault, can obtain the position of the concrete singlephase earth fault of branched line by said method, like this can so that the testing staff fix a breakdown fast.
See also Figure 12, the structural representation of another embodiment of a kind of branched line phase-to-ground fault detection device that provides for the embodiment of the present invention, this device comprises:
Obtain module 1101, the first judge module 1102, the second judge module 1103, the first determination module 1104, the second determination module 1105 and the first control module 1201, wherein
Obtain module 1101, be used for obtaining the first electric current of branched line.
The first judge module 1102 is used for judging whether described the first electric current is not less than predetermined current, obtains the first judged result.
The second judge module 1103 is used for judging whether described the first electric current satisfies pre-conditioned, obtains the second judged result.
The first determination module 1104, be used for showing that in described the first judged result described the first electric current is not less than described predetermined current, and it is described when pre-conditioned that described the second judged result shows that described the first electric current does not satisfy, and determines described branched line load side generation singlephase earth fault.
Preferably, the embodiment of the present invention can also comprise sending module, is used 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 being used for receiving the indication of the demarcation switch disjunction of controlling described branched line from described monitoring server, controls described demarcation switch disjunction.
The first control module 1201 is used for controlling the demarcation switch disjunction in described branched line after the first determination module 1104 is determined described branched line load side generation singlephase earth fault.
The second determination module 1105, be used for showing that in described the first judged result described the first electric current is less than described predetermined current, and it is described when pre-conditioned that described the second judged result shows that described the first electric current does not satisfy, and determines described branched line mains side generation singlephase earth fault.
The embodiment of the present invention can also comprise the second control module 1202, is used for after the second determination module 1105 is determined described branched line mains side generation singlephase earth fault, 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, is used 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 being used for receiving the indication of master switch disjunction of the distribution line of controlling described branched line place from described monitoring server, controls described master switch disjunction.
Need to prove, each embodiment in this instructions all adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment that between each embodiment, identical similar part is mutually referring to getting final product.For device or system class embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part gets final product referring to the part explanation of embodiment of the method.
Also need to prove, in this article, relational terms such as the first and second grades only is used for an entity or operation are separated with another entity or operational zone, and not necessarily requires or hint and have the relation of any this reality or sequentially between these entities or operation.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby make the process, method, article or the equipment that comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or also be included as the intrinsic key element of this process, method, article or equipment.In the situation that not more restrictions, the key element that is limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can directly use the software module of hardware, processor execution, and perhaps both combination is implemented.Software module can be placed in the storage medium of any other form 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, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, realization in other embodiments.Therefore, the present invention will can not be restricted to these embodiment 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 the first electric current is not less than predetermined current, obtain the first judged result;
Judge whether described the first electric current satisfies pre-conditioned, obtain the second judged result;
Show that in described the first judged result described the first electric current is not less than described predetermined current, and described the second judged result to show that described the first electric current does not satisfy described when pre-conditioned, determine described branched line load side generation singlephase earth fault;
Show described the first electric current less than described predetermined current in described the first judged result, and described the second judged result to show that described the first electric current does not satisfy described when pre-conditioned, determine described branched line mains side generation singlephase earth fault.
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 described information with described branched line load side generation singlephase earth fault is sent to monitoring server, also comprises:
After described monitoring server receives the indication of controlling the demarcation switch disjunction described branched line, control described demarcation switch disjunction.
6. a branched line phase-to-ground fault detection device, is characterized in that, comprising:
Obtain module, be used for obtaining the first electric current of branched line;
The first judge module is used for judging whether described the first electric current is not less than predetermined current, obtains the first judged result;
The second judge module is used for judging whether described the first electric current satisfies pre-conditioned, obtains the second judged result;
The first determination module, be used for showing that in described the first judged result described the first electric current is not less than described predetermined current, and it is described when pre-conditioned that described the second judged result shows that described the first electric current does not satisfy, and determines described branched line load side generation singlephase earth fault;
The second determination module, be used for showing that in described the first judged result described the first electric current is less than described predetermined current, and it is described when pre-conditioned that described the second judged result shows that described the first electric current does not satisfy, and determines described branched line mains side generation singlephase earth fault.
7. branched line phase-to-ground fault detection device according to claim 6, is characterized in that, also comprises:
The first control module is used for controlling the demarcation switch disjunction in described branched line after described the first determination module is determined described branched line load side generation singlephase earth fault.
8. branched line phase-to-ground fault detection device according to claim 6, is characterized in that, also comprises:
The second control module is used for after described the second determination module is determined described branched line mains side generation singlephase earth fault, 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 comprises:
Sending module is used for the information of described branched line load side generation singlephase earth fault is sent to monitoring server.
10. branched line phase-to-ground fault detection device according to claim 9, is characterized in that, also comprises:
The 3rd control module after being used for receiving the indication of the demarcation switch disjunction of controlling described branched line from described monitoring server, is controlled 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 |
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| CN103163416A true CN103163416A (en) | 2013-06-19 |
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