CN104297624A - Direct current ground fault detecting and handling method - Google Patents
Direct current ground fault detecting and handling method Download PDFInfo
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- CN104297624A CN104297624A CN201410618339.8A CN201410618339A CN104297624A CN 104297624 A CN104297624 A CN 104297624A CN 201410618339 A CN201410618339 A CN 201410618339A CN 104297624 A CN104297624 A CN 104297624A
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Abstract
The invention relates to the field of fault detecting of an electric system, in particular to a direct current ground fault detecting and handling method in the electric system. The direct current ground fault detecting and handling method comprises the steps that signals produced by a signal producing device are sent to a direct current system; a signal receiving device is used for receiving the signals from a to-be-detected branch of the direct current system, wherein if the signals are successfully received, it is shown that the to-be-detected branch does not have the direct current ground fault, and if the signals are not successfully received, it is shown that the direct current system has the direct current ground fault; the signal receiving device sends the features of the received signals to a central processing unit, and the central processing unit judges the ground situation of the direct current system according to the signal feature and makes a decision. By means of the technical scheme, the fault can be quickly and accurately positioned and handled with low cost while the branch run is not affected as much as possible, and the safety of the electric system is improved.
Description
Technical field
The present invention relates to the field of fault detection of electric system, particularly, relate to DC ground fault in a kind of electric system and detect and disposal route.
Background technology
Straight-flow system is the pith in transformer substation system; it will provide reliable and stable direct supply to relay protection device, and the safe and stable operation of relay protection device is the main equipment ensureing power equipment safety and prevent and limit the long-time large-area power-cuts of electric system.If direct supply cannot safely and steadily run, whole relay protection device can not effectively protect electrical power stabilization supply.
When straight-flow system negative or positive electrode and the earth between dielectric level drop to a certain setting valve or lower than a certain setting time, be called DC system grounding; When positive pole dielectric level is lower than being called positive ground connection during a certain setting; When negative insulation level is lower than being called negative ground connection during a certain setting.
The equipment that generating plant, transformer station direct current system connect is many, complex circuit, and in the process run, owing to being subject to the impact of external environment condition, different problem of aging all appears in cable and joint thereof, very easily DC Line Fault occurs.The operation of DC ground fault to transformer station has larger harm, and perhaps positive ground connection can cause the situation of tripping operation, and negative ground connection then may cause isolating switch tripping.Many accidents and danger, due to the fault of DC earthing, have been caused in some areas.Therefore, in practice, the reason that obstacle occurs constantly to be analyzed, to improve stability and the reliability of transformer station direct current system further.
Existing Method for Measuring Insulating Resistance comprises: equilibrium point emigrant method, unbalanced electric bridge, signal seek track method and Leakage Method etc.But; balanced bridge method and unbalanced electric bridge all can only detect the insulation status of whole electric system; when there is the branch road of DC ground fault in location; the connection between each branch road and DC bus need be disconnected successively; the branch road of the disconnection DC bus that this is will run under unprotect state, can not carry out any operation therebetween.In addition, though signal tracing method and Leakage Method can judge the branch road at DC ground fault place, but it easily receives the impact of branch road electric capacity, sensor accuracy, looped network and ripple interference, cause erroneous judgement, and complex structure, cost are higher, current transformer or DC leakage sensor need be arranged for each branch road.
Based on above-mentioned analysis, the present invention proposes that one does not affect that branch road runs, with low cost and localization of fault accurately DC ground fault detect and disposal route.
Summary of the invention
Branch road can be affected run for overcoming existing positioning DC fault ground method, locate the inaccurate and problem that cost is higher and make the present invention, for this reason, fundamental purpose of the present invention is to provide does not affect that branch road runs, with low cost and localization of fault accurately DC ground fault detect and disposal route, to solve relevant issues.
DC ground fault of the present invention detects and disposal route comprises:
The signal that signal generation apparatus produces is sent in straight-flow system;
Described signal is received from the branch road to be detected of described straight-flow system with signal receiving device, if can successfully receive described signal, illustrate that DC ground fault does not occur described branch road to be detected, receive described signal if fail, described straight-flow system generation DC ground fault is described;
The signal characteristic received is sent to central processing unit by described signal receiving device, and described central processing unit judges according to the Grounding of described signal characteristic to described straight-flow system and makes a policy.
Further, the signal that described signal generation apparatus produces is low frequency signal.
Further, carry out electric current clamp routing to described branch road to measure, the signal that measurement result and described signal receiving device receive is compared, if both sampling nature are more consistent, then illustrate that the duty of signal receiving device is normal, if both sampling nature are inconsistent, then illustrate that the duty of low frequency signal receiving trap may have problems.
Further, if all judge after every bar branch road of described straight-flow system detects DC ground fault occurs, then need to carry out further DC ground fault judgement by open line method to all branch roads, wherein, described open line method is for turning off other branch roads when measuring a certain branch road.
Further, the signal characteristic received is sent to central processing unit by described signal receiving device, and described central processing unit judges according to the Grounding of described signal characteristic to described straight-flow system and makes a policy.
Further; described decision-making at least comprises one of following: the earth fault menace level generating described straight-flow system; notify that maintenance personal overhauls described straight-flow system; adjust power system monitor and the Preservation tactics of the control of described straight-flow system, adjust the emissive power of described signal generation apparatus, frequency.
By means of technical scheme provided by the invention, detected and disposal route by DC ground fault provided by the invention, can run not affecting branch road as far as possible, with the accurately localizing faults also process in time fast of lower cost, improve the security of electric system.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from instructions, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in write instructions, claims and accompanying drawing and obtain.
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 that DC ground fault detects and disposal route realization flow figure;
Fig. 2 is DC ground fault detection system connection diagram.
Embodiment
Functional overview
Branch road can be affected run for overcoming existing positioning DC fault ground method, locate the inaccurate and problem that cost is higher and make the present invention, for this reason, fundamental purpose of the present invention is to provide does not affect that branch road runs, with low cost and localization of fault accurately DC ground fault detect and disposal route, to solve relevant issues.
Below in conjunction with accompanying drawing, embodiments of the invention are described.It should be noted that, when not conflicting, the technical characteristic in embodiments of the invention and embodiment can be combined with each other, all within protection scope of the present invention.In addition, for convenience of description, employ step number hereinafter, but this should not be construed as limitation of the present invention, in addition, although each step described in following methods shows logical order in flow charts, in some cases, can be different from the step shown or described by order execution herein.
Embodiment of the method
According to embodiments of the invention, provide a kind of DC ground fault and detect and disposal route method.
Fig. 1 shows and detects and treatment scheme according to the DC ground fault of the inventive method embodiment, comprises the steps:
Step S102, is sent in straight-flow system by the signal that signal generation apparatus produces;
Step S104, receives described signal with signal receiving device from the branch road to be detected of described straight-flow system;
Step S106, the signal characteristic received is sent to central processing unit by signal receiving device.
By the technical scheme that the present embodiment provides, can overcome existing positioning DC fault ground method can affect branch road operation, locate inaccurate and that cost is higher problem, improves the security of electric system.
Be described below in detail the details of above-mentioned process, Fig. 2 gives DC ground fault detection system connection diagram.
(1) step S102
The signal that signal generation apparatus produces is low frequency signal.
Emissive power, the frequency of signal generation apparatus generation signal are controlled by the center processor of electrical network.
(2) step S104
If signal receiving device can successfully receive described signal, there is not DC ground fault in described branch road to be detected, receives described signal if fail, and this straight-flow system generation DC ground fault is described
In order to whether the duty of validation signal receiving trap is normal, electric current clamp routing can be carried out to described branch road to measure, the signal that measurement result and described signal receiving device receive is compared, if both sampling nature (such as waveform characteristic) are more consistent, then illustrate that the duty of signal receiving device is normal, if both sampling nature are inconsistent, then illustrate that the duty of low frequency signal receiving trap may have problems, and needs central processing unit to make due adjustment according to this information.
If all judge after every bar branch road of described straight-flow system detects DC ground fault occurs, then may there is metallic ground by partial branch, need to carry out further DC ground fault judgement by open line method to all branch roads, to guarantee the reliability of DC ground fault result, wherein, described open line method is for turning off other branch roads when measuring a certain branch road.
(3) step S106
Central processing unit to judge the Grounding of described straight-flow system according to described signal characteristic (such as waveform, duration, amplitude or phase place average, amplitude or phase variance etc.) and makes a policy.
If there is earth fault in described straight-flow system, then central processing unit generates earth fault menace level, and notify that maintenance personal overhauls described straight-flow system, strengthen the real-time monitoring described straight-flow system being controlled to electrical network simultaneously, take Isolation and prevention means to reduce after above-mentioned grid collapses other regional power grids even impact of backbone network.
If central processing unit thinks that described signal characteristic exists distortion, then can increase by signaled signal generation apparatus the power sending signal, change the frequency sending signal.
In sum, by means of technical scheme of the present invention, can run not affecting branch road as far as possible, with the accurately localizing faults also process in time fast of lower cost, improve the security of electric system.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. DC ground fault detects and a disposal route, it is characterized in that, comprising:
The signal that signal generation apparatus produces is sent in straight-flow system;
Described signal is received from the branch road to be detected of described straight-flow system with signal receiving device, if can successfully receive described signal, illustrate that DC ground fault does not occur described branch road to be detected, receive described signal if fail, this straight-flow system generation DC ground fault is described;
The signal characteristic received is sent to central processing unit by described signal receiving device, and described central processing unit judges according to the Grounding of described signal characteristic to described straight-flow system and makes a policy.
2. method according to claim 1, the signal that described signal generation apparatus produces is low frequency signal.
3. method according to claim 1, carry out electric current clamp routing to described branch road to measure, the signal that measurement result and described signal receiving device receive is compared, if both sampling nature are more consistent, then illustrate that the duty of signal receiving device is normal, if both sampling nature are inconsistent, then illustrate that the duty of low frequency signal receiving trap may have problems.
4. method according to claim 1, if all judge after every bar branch road of described straight-flow system detects DC ground fault occurs, then need to carry out further DC ground fault judgement by open line method to all branch roads, wherein, described open line method is for turning off other branch roads when measuring a certain branch road.
5. method according to claim 1; described decision-making at least comprises one of following: the earth fault menace level generating described straight-flow system; notify that maintenance personal overhauls described straight-flow system; adjust power system monitor and the Preservation tactics of the control of described straight-flow system, adjust the signal transmission power of described signal generation apparatus, frequency.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410618339.8A CN104297624A (en) | 2014-11-06 | 2014-11-06 | Direct current ground fault detecting and handling method |
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| CN201410618339.8A CN104297624A (en) | 2014-11-06 | 2014-11-06 | Direct current ground fault detecting and handling method |
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Cited By (2)
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| CN105403808A (en) * | 2015-11-12 | 2016-03-16 | 张烨 | DC line ground fault point locating method and device |
| CN112557951A (en) * | 2020-12-10 | 2021-03-26 | 中国科学院合肥物质科学研究院 | On-line monitoring device of grounding system |
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Application publication date: 20150121 |