CN104515933A - Leak current fault detecting method and device - Google Patents
Leak current fault detecting method and device Download PDFInfo
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- CN104515933A CN104515933A CN201410773519.3A CN201410773519A CN104515933A CN 104515933 A CN104515933 A CN 104515933A CN 201410773519 A CN201410773519 A CN 201410773519A CN 104515933 A CN104515933 A CN 104515933A
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Abstract
The invention discloses a leak current fault detecting method and device. The method includes the steps of acquiring a current voltage value of each of three phase lines of a power transmission line to a ground; detecting whether or not the phase lines having a difference between the current voltage value and a normal voltage value being greater than a preset threshold exist in the three phase lines; if yes, marking the detected phase lines as phase lines having leak current fault. The current voltage value of each of the three phase lines of the low-tension distribution network power transmission line to the ground is acquired; according to the fact of whether or not the phase lines having the difference between the current voltage value and the normal voltage value being greater than the preset threshold exist in the detected phase lines, the phases having the leak current fault are judged; thus, the technical problem that the related part of leak current fault detection is low in detection efficiency is solved.
Description
Technical field
The present invention relates to technical field of electric power, in particular to a kind of leak current fault detection method and device.
Background technology
In low-voltage circuit operational process, often can encounter because user power utilization equipment failure causes line electrical leakage switch breaking situation.In troubleshooting, usually take by plucking the method trying mutually to send mutually to determine fault phase to reduce seek scope, and then trouble spot is carried out to fault phase search.
But the time is long, efficiency is low to adopt said method not only to search, meanwhile, repeatedly examination is sent and is also had very strong impact to user's electrical equipment.
At present, for above-mentioned technical matters, effective solution is not yet proposed.
Summary of the invention
Embodiments provide a kind of leak current fault detection method and device, at least to solve the technical matters that in correlation technique, the detection efficiency of leak current fault is lower.
According to an aspect of the embodiment of the present invention, provide a kind of detection method of leak current fault, comprising: obtain the current voltage value between each and the ground in the triple-phase line of power transmission line; Detect the difference whether existed between described current voltage value and normal voltage value in described triple-phase line and be greater than the phase line of predetermined threshold, wherein, described normal voltage value is the magnitude of voltage of described phase line when there is not leak current fault between described phase line and described ground; If the difference existed between described current voltage value and normal voltage value is greater than the phase line of predetermined threshold in described triple-phase line, then the described phase line detected is labeled as the phase line occurring leak current fault.
Alternatively, the current voltage value between each and ground in the triple-phase line of described acquisition power transmission line comprises: from the voltage check part between each and the ground that are arranged on described triple-phase line, obtain described current voltage value.
Alternatively, obtain described current voltage value in the voltage check part between described each and ground from being arranged on described triple-phase line to comprise: send voltage to described voltage check part and obtain and ask; Receive the described current voltage value that described voltage check part returns.
Alternatively, described voltage check part comprises: voltage table.
Alternatively, the described described phase line detected being labeled as occurs that the phase line of leak current fault comprises: light and be labeled as with described the pilot lamp occurring that the phase line of leak current fault is corresponding.
According to the another aspect of the embodiment of the present invention, provide a kind of leak current fault pick-up unit, comprise: acquisition module, be connected respectively with the triple-phase line of described power transmission line, for obtaining the current voltage value between each and the ground in the triple-phase line of described power transmission line; Detection module, be connected with described acquisition module, the phase line of predetermined threshold is greater than for detecting the difference whether existed between described current voltage value and normal voltage value in described triple-phase line, wherein, described normal voltage value is the magnitude of voltage of described phase line when there is not leak current fault between described phase line and described ground; Mark module, be connected with described detection module, when being greater than the described phase line of described predetermined threshold for the difference existed between described current voltage value and described normal voltage value in described triple-phase line, the described phase line detected is labeled as the phase line occurring leak current fault.
Alternatively, described acquisition module comprises: voltage check part, is arranged between each and the described ground in described triple-phase line, for obtaining described current magnitude of voltage.
Alternatively, described acquisition module comprises: transmitting element, is connected with described voltage check part, obtains request for sending voltage to described voltage check part; Receiving element, is connected with described voltage check part, for receiving the described current voltage value that described voltage check part returns.
Alternatively, described voltage check part comprises: voltage table.
Alternatively, described mark module comprises: pilot lamp, is used to indicate the phase line being labeled as and occurring leak current fault.
The embodiment of foregoing invention can reach following beneficial effect:
In embodiments of the present invention, by the falling quantity of voltages in above-mentioned phase line, the phase line that there is leak current fault can be detected, and do not need to carry out by plucking phase mutually to the three-phase in power transmission line, thus the technical matters that in solution correlation technique, the detection efficiency of leak current fault is lower, improve the detection efficiency of leak current fault.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the detection method process flow diagram of the optional a kind of leak current fault of the embodiment of the present invention;
Fig. 2 is the detection method circuit structure diagram of the optional a kind of leak current fault of the embodiment of the present invention;
Fig. 3 is the detection method process flow diagram of the optional another kind of leak current fault of the present embodiment of the present invention;
Fig. 4 is the optional a kind of leak current fault structure of the detecting device block diagram of the present embodiment of the present invention;
Fig. 5 is the optional another kind of leak current fault structure of the detecting device block diagram of the present embodiment of the present invention.
Embodiment
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
Embodiment 1:
Fig. 1 is the detection method process flow diagram of the optional a kind of leak current fault of the embodiment of the present invention.As shown in Figure 1, a kind of detection method of leak current fault, comprising:
S102: obtain the current voltage value between each and the ground in the triple-phase line of power transmission line;
S104: detect the difference whether existed between current voltage value and normal voltage value in triple-phase line and be greater than the phase line of predetermined threshold, wherein, described normal voltage value is the magnitude of voltage of phase line when there is not leak current fault between phase line and ground;
S106: if the difference existed in triple-phase line between current voltage value and normal voltage value is greater than the phase line of predetermined threshold, then the phase line detected is labeled as the phase line occurring leak current fault.
Fig. 2 is the detection method circuit structure diagram of the optional a kind of leak current fault of the embodiment of the present invention;
As shown in Figure 2, alternatively, in S102, the current voltage value obtained between each and the ground in the triple-phase line of power transmission line comprises: from the voltage check part between each and the ground that are arranged on triple-phase line, obtain current voltage value.Alternatively, voltage check part comprises: voltage table 11.
In the present embodiment, by the corresponding voltage check part voltage table 11 connected in each phase of low-voltage network triple-phase line, change in voltage between each phase and ground of Real-Time Monitoring triple-phase line, when power transmission line is a certain there is earth fault mutually time, while generation ground current, voltage drop in corresponding phase line, can detect by the change of monitoring relevant voltage the phase line broken down.The detection method of the leak current fault of the present embodiment can not only improve the detection efficiency of leak current fault, can avoid taking in correlation technique simultaneously by the impact impact caused electrical equipment when plucking mutually and try delivery method mutually to determine fault phase.
For example, normal voltage value is 220 (V), and predetermined threshold is 4 (V).Suppose that the voltage of a phase line detected in triple-phase line by voltage table 11 is 210 (V), like this, difference between the voltage of a phase line and normal voltage value is 10 (V), be greater than predetermined threshold, thus judge that leak current fault appears in a phase line in triple-phase line, a phase line in triple-phase line is labeled as the phase line occurring leak current fault.
The mode of above-mentioned judgement is equally applicable to b phase line in triple-phase line and c phase line.
It should be noted that, above-mentioned predetermined threshold is 4 (V), and be only an example, the present embodiment does not limit this.
Alternatively, except the falling quantity of voltages in phase line, can also in conjunction with other because usually judging whether this phase line occurs leak current fault, wherein, other factors can be, but not limited to the ground current of this phase line.Such as, if meet ground current falling quantity of voltages more than 800mA while to reach 4V and above phase line, this phase line can be defined as the phase line of leak current fault.
Embodiment 2:
Fig. 3 is the detection method process flow diagram of the optional another kind of leak current fault of the present embodiment of the present invention.
As shown in Figure 3, alternatively, from the voltage check part between each and the ground that are arranged on triple-phase line, obtain current voltage value to comprise:
S202: send voltage to voltage check part and obtain request;
S204: the described current voltage value that receiver voltage detection part returns.
Such as, to a phase line, the voltage check part voltage table 11 of b phase line and c phase line all sends voltage and obtains request, the current voltage of Real-time Obtaining returns by voltage table 11, suppose to detect that the voltage of a phase line in triple-phase line and c phase line is respectively 218 (V) and 212 (V) by voltage table 11, like this, difference between the voltage of a phase line and normal voltage value is 2 (V), in predetermined threshold range, and the difference between the voltage of c phase line and normal voltage value is 8 (V), exceed predetermined threshold range, thus judge that leak current fault appears in the c phase line in triple-phase line, c phase line in triple-phase line is labeled as the phase line occurring leak current fault.
Conveniently testing staff grasps the phase line occurring earth fault fast, alternatively, all connects corresponding pilot lamp three phase lines, when leak current fault appears in corresponding phase line, lights and is labeled as the pilot lamp occurring that the phase line of leak current fault is corresponding.By pilot lamp mark fault phase line, testing staff can be made to grasp fault phase line in power transmission line intuitively, quickly.
Embodiment 3:
Fig. 4 is the optional a kind of leak current fault structure of the detecting device block diagram of the present embodiment of the present invention.
As shown in Figure 4, alternatively, comprising: acquisition module 1, be connected respectively with the triple-phase line of power transmission line, for obtaining the current voltage value between each and the ground in the triple-phase line of power transmission line; Detection module 2, be connected with acquisition module 1, the phase line of predetermined threshold is greater than for detecting the difference whether existed between current voltage value and normal voltage value in triple-phase line according to the current voltage value obtained, wherein, normal voltage value is the magnitude of voltage of phase line when there is not leak current fault between phase line and ground; Mark module 3, is connected with detection module 2, is labeled as the phase line difference existed between current voltage value and normal voltage value in the triple-phase line detected being greater than predetermined threshold the phase line occurring leak current fault.
In the present embodiment, by the corresponding acquisition module 1 connected in each phase of low-voltage network triple-phase line, the current voltage value between each and ground in the triple-phase line of Real-time Obtaining power transmission line; Detection module 2, is connected with acquisition module 1, is greater than the phase line of predetermined threshold for detecting the difference whether existed between current voltage value and normal voltage value in triple-phase line according to the current voltage value obtained.When power transmission line is a certain there is earth fault mutually time, while generation ground current, voltage drop in corresponding phase line, the phase line being greater than predetermined threshold by detecting the difference whether existed between current voltage value and normal voltage value in current voltage value detection triple-phase line can draw fault phase line.Generally, meet more than ground current 800mA voltage drop 4V and above phase line simultaneously, leak current fault phase line can be defined as.The detection method of the leak current fault of the present embodiment can not only improve the detection efficiency of leak current fault, can avoid taking in correlation technique simultaneously by the impact impact caused electrical equipment when plucking mutually and try delivery method mutually to determine fault phase.
Fig. 5 is the optional another kind of leak current fault structure of the detecting device block diagram of the present embodiment of the present invention.
As shown in Figure 5, alternatively, acquisition module 1 comprises: voltage check part, is arranged between phase line and ground, for obtaining current magnitude of voltage.Alternatively, voltage check part comprises: voltage table 11.Alternatively, acquisition module 1 also comprises: transmitting element 12, is connected with voltage check part voltage table 11, obtains request for sending voltage to voltage check part; Receiving element 13, is connected with voltage check part voltage table 11, for the current voltage value that receiver voltage detection part returns.
Alternatively, mark module 3 comprises: pilot lamp 31, is used to indicate mark module 3 and is labeled as the phase line occurring leak current fault.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
In the above embodiment of the present invention, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a detection method for leak current fault, is characterized in that, comprising:
Obtain the current voltage value between each and the ground in the triple-phase line of power transmission line;
Detect the difference whether existed between described current voltage value and normal voltage value in described triple-phase line and be greater than the phase line of predetermined threshold, wherein, described normal voltage value is the magnitude of voltage of described phase line when there is not leak current fault between described phase line and described ground;
If the difference existed between described current voltage value and described normal voltage value is greater than the described phase line of described predetermined threshold in described triple-phase line, then the described phase line detected is labeled as the phase line occurring leak current fault.
2. method according to claim 1, is characterized in that, the current voltage value between each and ground in the triple-phase line of described acquisition power transmission line comprises:
Described current voltage value is obtained from the voltage check part between each and the described ground that are arranged on described triple-phase line.
3. method according to claim 2, is characterized in that, obtains described current voltage value and comprise in the voltage check part between described each and ground from being arranged on described triple-phase line:
Send voltage to described voltage check part and obtain request;
Receive the described current voltage value that described voltage check part returns.
4. according to the method in claim 2 or 3, it is characterized in that, described voltage check part comprises: voltage table.
5. according to the method in any one of claims 1 to 3, it is characterized in that, the described described phase line detected being labeled as occurs that the phase line of leak current fault comprises:
Light and be labeled as with described the pilot lamp occurring that the phase line of leak current fault is corresponding.
6. a pick-up unit for leak current fault, is characterized in that, comprising:
Acquisition module, is connected respectively with the triple-phase line of power transmission line, for obtaining the current voltage value between each and the ground in the triple-phase line of described power transmission line;
Detection module, be connected with described acquisition module, the phase line of predetermined threshold is greater than for detecting the difference whether existed between described current voltage value and normal voltage value in described triple-phase line, wherein, described normal voltage value is the magnitude of voltage of described phase line when there is not leak current fault between described phase line and described ground;
Mark module, be connected with described detection module, when being greater than the described phase line of described predetermined threshold for the difference existed between described current voltage value and described normal voltage value in described triple-phase line, the described phase line detected is labeled as the phase line occurring leak current fault.
7. device according to claim 6, is characterized in that, described acquisition module comprises:
Voltage check part, is arranged between each and the described ground in described triple-phase line, for obtaining described current voltage value.
8. device according to claim 7, is characterized in that, described acquisition module comprises:
Transmitting element, is connected with described voltage check part, obtains request for sending voltage to described voltage check part;
Receiving element, is connected with described voltage check part, for receiving the described current voltage value that described voltage check part returns.
9. the device according to claim 7 or 8, is characterized in that, described voltage check part comprises: voltage table.
10. the device according to any one of claim 6 to 8, is characterized in that, described mark module comprises:
Pilot lamp, is labeled as the phase line occurring leak current fault described in being used to indicate.
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| CN201410773519.3A CN104515933A (en) | 2014-12-12 | 2014-12-12 | Leak current fault detecting method and device |
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| CN201410773519.3A CN104515933A (en) | 2014-12-12 | 2014-12-12 | Leak current fault detecting method and device |
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| CN105572530A (en) * | 2015-12-11 | 2016-05-11 | 国网北京市电力公司 | Electric leakage detection device |
| CN105675966A (en) * | 2016-01-08 | 2016-06-15 | 安徽长远绿色能源有限公司 | Fault arc detection method based on difference calculation and protection device thereof |
| CN110780129A (en) * | 2019-10-17 | 2020-02-11 | 国网吉林省电力有限公司电力科学研究院 | Electricity stealing and leakage positioning method based on current deviation analysis technology |
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