CN102508102A - Power cable operation fault monitoring terminal and system for detecting earth fault - Google Patents
Power cable operation fault monitoring terminal and system for detecting earth fault Download PDFInfo
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- CN102508102A CN102508102A CN201110352916XA CN201110352916A CN102508102A CN 102508102 A CN102508102 A CN 102508102A CN 201110352916X A CN201110352916X A CN 201110352916XA CN 201110352916 A CN201110352916 A CN 201110352916A CN 102508102 A CN102508102 A CN 102508102A
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Abstract
The embodiment of the invention provides a power cable operation fault monitoring terminal and a power cable operation fault monitoring system for detecting earth fault. The terminal comprises three detectors which are arranged on three phases of a cable line respectively, and a communication host machine which is connected with the three detectors; the three detectors are used for sending a line-to-ground fault report to the communication host machine when detecting that the line current of the corresponding phase meets a preset condition, and the communication host machine sends the fault report to a monitoring center; and the preset condition is that: suddenly increasing transient capacitance current exists in the line, the earth current exists in the line, the voltage of an earth line is reduced by over 3kV, and the earth line is still in a power supply state.
Description
Technical field
The invention belongs to the power technology field, relate in particular to a kind of power cable operation troubles monitor terminal and system that is grounded fault detect.
Background technology
Along with computer technology, gordian techniquies such as the communication technology constantly are introduced into each link of electrical production, and increasing problem also is able to solve thereupon in the electrical production, and has obtained better development, makes electrical production safer, stable, efficient and energy-conservation.
However, power circuit moves outside people's sight line for a long time, makes it difficult in maintenance, thereby causes the cable fault of operation throughout the year to take place frequently, and especially in peak of power consumption period, failure rate is higher.In case break down, it is difficult to search the fault ten minutes.Though can use some instruments to measure the approximate location of cable, many with intersecting side by side in worker's well with cables, cause to be difficult to failure judgement on earth on any root cable, and the fault judgement mistake can cause very serious consequence.For fear of the problems referred to above, need usually manual work one by one worker's well remove to seek cable louding, and seek the cable break down.The Breakdown Maintenance of the cable long for circuit, that intermediate head is many need consume great amount of manpower and material resources.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of power cable operation troubles monitor terminal and system that is grounded fault detect, can locate earth fault quickly and accurately.
For realizing above-mentioned purpose; One embodiment of the present of invention provide a kind of power cable operation troubles monitor terminal that is grounded fault detect; Comprise: be respectively installed to three detecting devices on the cable line three-phase, and with said three host computer communications that detecting device is connected;
Said three detecting devices are used for when the line current that detects corresponding phase satisfies predetermined condition, report to host computer communication transmitting line earth fault, and by host computer communication this Trouble Report are sent to Surveillance center;
Said predetermined condition is:
Suddenly the transient state capacitance current of increase appears in the circuit, and
There is ground current in the circuit, and
Ground path voltage reduces more than the 3kV, and ground path still is in power supply state.
On the other hand, the present invention also provides a kind of power cable operation troubles supervisory system that is grounded fault detect, it is characterized in that, comprises that Surveillance center and at least one are like the above-mentioned power cable operation troubles monitor terminal that is grounded fault detect.
According to the embodiment of the invention; Monitor terminal in the present embodiment effectively monitoring cable operation state; And, earth fault notifies Surveillance center when taking place immediately; Improved the work efficiency that inspection is safeguarded, alleviated staff's labour intensity, and can locate earth fault quickly and accurately.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the synoptic diagram of an embodiment of the power cable operation troubles monitor terminal that is grounded fault detect provided by the invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer; To combine the accompanying drawing in the embodiment of the invention below; Technical scheme in the embodiment of the invention is carried out clear, intactly description; Obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Embodiment one
Fig. 1 shows an embodiment who is grounded the power cable operation troubles monitor terminal of fault detect provided by the invention; This monitor terminal comprises three detecting device 101a, 101b and 101c on the ABC three-phase that is installed in cable line; Suppose especially that in the present embodiment detecting device 101a is installed in A and goes up mutually; Detecting device 101b is installed in B and goes up mutually, and detecting device 101c is installed in C and goes up mutually.Three detecting device 101a, 101b and 101c are installed on the same host computer communication 102 jointly.
Each detecting device can obtain the line current of its place phase respectively, and for example detecting device 101a is installed in A and goes up mutually, can obtain the line current of A phase.
Each detecting device is after obtaining line current; Whether the line current that can detect corresponding phase satisfies the predetermined condition of earth fault; If Mazu; Then detecting device sends the earth fault report to connected host computer communication 102, and this Trouble Report is sent to the Surveillance center of network one side by host computer communication 102.
In reality; When circuit generation single-phase earthing, according to different grounding requirements, the transition effect of multiple complicacy can appear; Comprise the distributed capacitance discharge current that line-to-ground occurs; Ground path voltage over the ground descends, and ground path the inferior higher hamonic wave of 5-7 occurs and increases phenomenon, and this circuit zero-sequence current increases; Comprehensive above situation, in the present embodiment, the predetermined condition of above-mentioned earth fault is:
Suddenly the transient state capacitance current (in reality, can be 4-5A) of increase appears in the circuit, and
Exist in the circuit ground current (in reality can >=10A), and
Ground path voltage reduces more than the 3kV, and ground path still is in power supply state.
In reality, normally be responsible for electric current and be 80A when above, can be more than the 350A with the value defined that is four times in the normal load current value.
In whole power cable system; In each position that need monitor the monitor terminal in the present embodiment is installed; And three detecting devices in the monitor terminal are installed on the monitoring position place three-phase line; When earth fault appears in certain position of certain root cable, the monitor terminal that is installed in this position of this cable will report the earth fault report from trend Surveillance center.Surveillance center can number all monitor terminals in the total system in advance; And the installation site of writing down the monitor terminal of each numbering; Surveillance center just can be according to the label of the monitor terminal that sends the earth fault report like this, and the position of earth fault takes place in the location.
Certainly; Also can in the monitor terminal at the scene a GPS module be set; Communication host is before sending to monitoring with the earth fault report; Read the current position coordinates that the GPS module is obtained simultaneously, and send to Surveillance center in the lump together with the earth fault report, Surveillance center also can obtain to take place the positional information of earth fault like this.
In the present embodiment, the communication host in the monitor terminal can be supplied power by solar storage battery, and directly charges to battery through solar panels, thereby further reduces the number of times that the work committee member safeguards this monitor terminal.
In addition, communication host can have the gsm communication module, and this module is used ICP/IP protocol, and like this, communication host can report that the mode through wireless GPRS is uploaded to Surveillance center with earth fault.
Monitor terminal in the present embodiment effectively monitoring cable operation state; And, line-to-ground fault notifies Surveillance center when taking place immediately; Improved the work efficiency that inspection is safeguarded, alleviated staff's labour intensity, and can locate earth fault quickly and accurately.
Embodiment two
Another embodiment of the present invention also provides a kind of power cable operation troubles supervisory system that is grounded fault detect, and this system comprises Surveillance center and at least one monitor terminal a kind of like embodiment.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (4)
1. a power cable operation troubles monitor terminal that is grounded fault detect is characterized in that, comprising: be respectively installed to three detecting devices on the cable line three-phase, and with said three host computer communications that detecting device is connected;
Said three detecting devices are used for when the line current that detects corresponding phase satisfies predetermined condition, report to host computer communication transmitting line earth fault, and by host computer communication this Trouble Report are sent to Surveillance center;
Said predetermined condition is:
Suddenly the transient state capacitance current of increase appears in the circuit, and
There is ground current in the circuit, and
Ground path voltage reduces more than the 3kV, and ground path still is in power supply state.
2. the power cable operation troubles monitor terminal that is grounded fault detect according to claim 1 is characterized in that said transient state capacitance current is 4-5A.
3. the power cable operation troubles monitor terminal that is grounded fault detect according to claim 1 is characterized in that said ground current is more than or equal to 10A.
4. a power cable operation troubles supervisory system that is grounded fault detect is characterized in that, comprises that Surveillance center and at least one are like any described power cable operation troubles monitor terminal that is grounded fault detect in the claim 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110352916XA CN102508102A (en) | 2011-11-09 | 2011-11-09 | Power cable operation fault monitoring terminal and system for detecting earth fault |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110352916XA CN102508102A (en) | 2011-11-09 | 2011-11-09 | Power cable operation fault monitoring terminal and system for detecting earth fault |
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| CN102508102A true CN102508102A (en) | 2012-06-20 |
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| CN201110352916XA Pending CN102508102A (en) | 2011-11-09 | 2011-11-09 | Power cable operation fault monitoring terminal and system for detecting earth fault |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364685A (en) * | 2013-07-22 | 2013-10-23 | 珠海创能科世摩电气科技有限公司 | Current temperature on-line fault indicator and method for judging fault |
| CN106771870A (en) * | 2016-12-26 | 2017-05-31 | 北京国电通网络技术有限公司 | A kind of distribution net work earthing fault localization method and system |
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| JPH11344525A (en) * | 1998-06-02 | 1999-12-14 | Nissin Electric Co Ltd | Fault point plotting device |
| CN1901314A (en) * | 2006-07-21 | 2007-01-24 | 重庆大学 | Fault line selecting method for distribution system single phase earthing |
| KR100829174B1 (en) * | 2006-11-06 | 2008-05-13 | 한전케이디엔 주식회사 | Detecting Method of Fault Indication in Distributing Line |
| CN201555917U (en) * | 2009-12-10 | 2010-08-18 | 桂林电子科技大学 | Power system fault indicating device |
| CN102025196A (en) * | 2010-12-24 | 2011-04-20 | 江苏电力信息技术有限公司 | Service oriented architecture (SOA)-based grid equipment monitoring and failure positioning wireless system |
| CN102195278A (en) * | 2011-05-30 | 2011-09-21 | 齐传正 | Solution for eliminating false grounding phenomenon of 10-35kV ungrounded running power grid |
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2011
- 2011-11-09 CN CN201110352916XA patent/CN102508102A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE2112136B2 (en) * | 1971-03-10 | 1978-02-02 | Siemens AG, 1000 Berlin und 8000 München | Digital network for locating power line short circuits - stores current and voltage at both ends of line in digital form before performing algorithmic calculation |
| JPH11344525A (en) * | 1998-06-02 | 1999-12-14 | Nissin Electric Co Ltd | Fault point plotting device |
| CN1901314A (en) * | 2006-07-21 | 2007-01-24 | 重庆大学 | Fault line selecting method for distribution system single phase earthing |
| KR100829174B1 (en) * | 2006-11-06 | 2008-05-13 | 한전케이디엔 주식회사 | Detecting Method of Fault Indication in Distributing Line |
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| CN102025196A (en) * | 2010-12-24 | 2011-04-20 | 江苏电力信息技术有限公司 | Service oriented architecture (SOA)-based grid equipment monitoring and failure positioning wireless system |
| CN102195278A (en) * | 2011-05-30 | 2011-09-21 | 齐传正 | Solution for eliminating false grounding phenomenon of 10-35kV ungrounded running power grid |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364685A (en) * | 2013-07-22 | 2013-10-23 | 珠海创能科世摩电气科技有限公司 | Current temperature on-line fault indicator and method for judging fault |
| CN103364685B (en) * | 2013-07-22 | 2016-06-29 | 珠海创能科世摩电气科技有限公司 | The online fault detector of current temperature and failure judgment method |
| CN106771870A (en) * | 2016-12-26 | 2017-05-31 | 北京国电通网络技术有限公司 | A kind of distribution net work earthing fault localization method and system |
| US10962582B2 (en) | 2016-12-26 | 2021-03-30 | Beijing Guodian Tong Network Technology Co., Ltd | Ground position of the ground fault method for power distribution network, system, and storage medium |
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Application publication date: 20120620 |