CN102221664A - Grounding fault detection method of overhead high voltage circuit - Google Patents
Grounding fault detection method of overhead high voltage circuit Download PDFInfo
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- CN102221664A CN102221664A CN2011101417475A CN201110141747A CN102221664A CN 102221664 A CN102221664 A CN 102221664A CN 2011101417475 A CN2011101417475 A CN 2011101417475A CN 201110141747 A CN201110141747 A CN 201110141747A CN 102221664 A CN102221664 A CN 102221664A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention provides a grounding fault detection method of an overhead high voltage circuit. The method comprises the following steps: a sampling sensor is provided in a high voltage circuit; information of capacitance current and electric field voltage in grounding instant is induced through a capacitance current sampling circuit; high level is outputted to a signal indication circuit through a logic determination circuit; and the signal indication circuit sends a grounding fault indication.
Description
Technical field
The present invention relates to a kind of overhead high voltage line earth-fault detecting method that is used for, relate in particular to a kind of be used to be installed in built on stilts 6-35KV isolated neutral or the earth-fault detecting method on the arc suppression coil earthing system high-tension line.
Background technology
Overhead high voltage line often is subjected to the influence of earth fault, causes the hidden failure of circuit, has a strong impact on normal electric power and carries and power grid security.Behind system's generation single-phase earthing, ground current is very little, only is several the peace to tens peaces, the not power supply of interrupt system, but because the existence of earth fault is arranged, phase-to-ground voltage raises, reliability of system operation is affected.The method of detection of ground faults roughly has two classes at present: but a class is line selection apparatus, promptly in transformer station line selection apparatus is installed, and can judge concrete which bar high-tension line generation earth fault, but then can not differentiate to the particular location of this circuit; Another kind of is handheld device, and promptly after the ground connection that high-tension line takes place not have a power failure, pipeline rider's hand-held instrument is searched along the line, and this method not only labour intensity is big, and for the singlephase earth fault that takes place simultaneously to have a power failure, adopts the handheld device cisco unity malfunction.The principle of this equipment mostly is the residual voltage and the zero-sequence current of sensor wire, relatively judges mutually, can not differentiate for the high-and low-voltage circuit of joint using.
Summary of the invention
The object of the present invention is to provide the fault detection method behind a kind of high-tension line generation single-phase earthing, when circuit generation earth fault, the accurate position of fault location, and can be used to joint use the circuit of height line ball.
Foundation of the present invention is, electric current radio-frequency component on the general normal power supply circuit is very little, and when single-phase earthing takes place, the radio-frequency component that significant proportion is arranged in its ground current, this ground connection high-frequency current instantaneous direction is relevant with ground connection transient voltage direction, when detecting the HF voltage electric current that homophase is arranged in certain moment on certain circuit, and the high-frequency current sudden change is greater than certain numerical value, and can judge on this circuit has singlephase earth fault.
The technical solution used in the present invention is come as follows:
The overhead high voltage line earth-fault detecting method is characterized in that:
(1) sampling sensor is set on high-tension line, described sampling sensor comprises capacitance current sample circuit and lead voltage of electric field sample circuit; The output terminal of capacitance current sample circuit and lead voltage of electric field sample circuit is connected with two input ends of a logic judging circuit respectively, and the output terminal of logic judging circuit connects the input end of a signal indicating circuit;
(2) the electric current capacitance variations information by lead capacitance current sampling circuit inductive grounding instantaneous pressure circuit, and send the input end of a high level to logic judging circuit at its output terminal;
(3) send a high level another input end to logic judging circuit by the lead voltage of electric field sample circuit induction high-tension line ground connection change in voltage information of moment, and at its output terminal;
(4) signal sent here according to capacitance current sample circuit and lead voltage of electric field sample circuit of logic judging circuit judges that when the two was high level, logic judging circuit was sent a high level to signal indicating circuit at its output terminal;
(5) when the input end of signal indicating circuit was high level, signal indicating circuit promptly sent the ground connection shows signal.
Described capacitance current sample circuit comprises current sensor, rectifier filer, signal output apparatus, and its effect is a sampling ground connection moment capacitance current.Current sensor is a magnet ring that is wound with coil, this magnet ring is set in the top in institute survey line highway section, two termination rectifier filers of coil, when circuit generation earth fault, the immediate current sudden change, the coil two ends HF voltage of will inducting, this HF voltage direction with moment the mutation current direction relevant, through rectifier filer filtering low frequency part, according to the induced potential direction, if induced potential and electric current homophase are then exported high level to logic judging circuit at the output terminal of signal output apparatus.
Described voltage of electric field sample circuit be by after the series connection of two diodes again with a resistance capacitance and connect an electric capacity and isolate; The positive pole of one of them diode and the negative pole of another diode connect the magnet ring of current sensor with lead, promptly connect the power transmission line of surveying, its output signal connects a phase inverter through the triode conducting, signal is delivered to logic judging circuit after anti-phase, the positive pole of another diode connects power cathode and connects a copper sheet unsettled, and the effect of this copper sheet is that the earth is formed an electric capacity.
Described logic judging circuit comprises trigger and capacitance-resistance time-delay reset circuit, trigger has output terminal of two input ends, when trigger receives the high level that high level that the capacitance current sample circuit sends here and voltage of electric field sample circuit are sent here, trigger output high level is to signal indicating circuit and capacitance-resistance time-delay reset circuit, and the capacitance-resistance time-delay reset circuit is with trigger reset.
Described signal indicating circuit comprises trigger, capacitance-resistance time-delay reset circuit, acousto-optic indicating circuit, when receiving current/voltage, the trigger input end judges the high level signal of sending here, the trigger output terminal is sent high level to acousto-optic indicating circuit and capacitance-resistance time-delay reset circuit, the acousto-optic indicating circuit sends acousto-optic indication short trouble, and the capacitance-resistance time-delay reset circuit is with trigger reset.
The present invention is by sampling high-tension line ground connection capacitance current and the voltage of electric field of moment, in certain duration, when the first half-wave sudden change of moment capacitance current greater than certain numerical value, and the ground connection phase voltage is when reducing, then think high-tension line generation earth fault, otherwise earth fault does not take place.Determination methods of the present invention is simply accurate, can at a plurality of sections of circuit sensor be set as required, when circuit takes place can show ground connection branch and ground wire section after the ground connection, thereby energy is the position of fault location accurately, find the trouble spot rapidly, improve power supply reliability, reduce labor intensity; The present invention can be used to joint use the circuit of high and low line ball.
Description of drawings
Fig. 1 is the building-block of logic of the inventive method
Fig. 2 is capacitance current sample circuit figure of the present invention
Fig. 3 is voltage of electric field sample circuit figure of the present invention
Fig. 4 is logic judging circuit figure of the present invention
Fig. 5 is signal indicating circuit figure of the present invention
Embodiment
Below in conjunction with accompanying drawing, detection method of the present invention is elaborated by embodiment.
Fig. 1 is the building-block of logic of the inventive method.Overhead high voltage line earth-fault detecting method of the present invention may further comprise the steps:
(1) sampling sensor is set on high-tension line, described sampling sensor comprises capacitance current sample circuit and lead voltage of electric field sample circuit; The output terminal of capacitance current sample circuit and lead voltage of electric field sample circuit is connected with two input ends of a logic judging circuit respectively, and the output terminal of logic judging circuit connects the input end of a signal indicating circuit;
(2) the electric current capacitance variations information by capacitance current sample circuit inductive grounding instantaneous pressure circuit, and send the input end of a high level to logic judging circuit at its output terminal;
(3) send a high level another input end to logic judging circuit by the voltage of electric field sample circuit induction high-tension line ground connection change in voltage information of moment, and at its output terminal;
(4) signal sent here according to capacitance current sample circuit and lead voltage of electric field sample circuit of logic judging circuit judges that when the two was high level, logic judging circuit was sent a high level to signal indicating circuit at its output terminal;
(5) when the input end of signal indicating circuit was high level, signal indicating circuit promptly sent the ground connection shows signal.
Referring to shown in Figure 2, the capacitance current sample circuit mainly comprises current sensor, rectifier filer and signal output apparatus, and the effect of capacitance current sample circuit is a sampling ground connection moment capacitance current.Current sensor can be that a magnet ring that is wound with coil is L1, and this magnet ring is set in the top in institute survey line highway section, two termination rectifier filers of coil.Rectifier filer is made up of D1, D2, D3, D4, C1, C2, C3, C4, R3, R4, R5, C5, and signal output apparatus is made up of triode T1, resistance R 6, R7, capacitor C 6, phase inverter U1A.When circuit generation earth fault, the immediate current sudden change, the coil L1 HF voltage of will inducting at two ends, this HF voltage direction with moment the mutation current direction relevant, through rectifier filer filtering low frequency part, according to the induced potential direction, if induced potential and electric current homophase, then export 1 pin of a low level, after anti-phase, then export high level to the current/voltage decision circuitry at 2 pin of phase inverter U1A to phase inverter U1A.
Among Fig. 3, lead voltage of electric field sample circuit is by diode D5, after the D6 series connection again with a resistance capacitance and connect, the contact of two diodes, it is the negative pole of the positive pole of D5 and D6 connects current sensor with lead iron core, it is GY power transmission line that termination is surveyed, the negative pole of diode D5 is isolated the base stage that meets triode T2 by capacitor C 8, the negative pole of D5 is delivered to C8 as the voltage of electric field sampling end, the emitter of T2 meets a phase inverter U1B, U1B exports as signal after with signal inversion, the positive pole of D6 connects the negative pole of power supply B1, and it is unsettled to connect a copper sheet, and the effect of this copper sheet is that the earth is formed a capacitor C 18.When the GY point is high level, 3 pin of U1B are high level, when GY is low level, C8 is low level to the R8 discharge, the T2 base stage becomes low level by the C8 discharge, and the T2 emitter is a low level to the collector conducting, and 3 pin that make U1B are low level, 4 pin of U1B are high level output, deliver to the current/voltage decision circuitry.
Among Fig. 4, logic judging circuit adds the capacitance-resistance time-delay by a trigger U2A and forms, and trigger U2A input end is D, CLK.Output terminal is Q; When earth fault takes place when, the capacitance current sample circuit is sent high level signal here, and to send into 5 pin of trigger be D end, simultaneously the voltage of electric field sample circuit is also sent high level signal here to send into 3 pin of trigger is the CLK end, and trigger output terminal Q is a high level, sends into signal indicating circuit.Trigger charges to C9 through R10, when C9 is charged as high level, high level signal is sent into 4 pin of U2A with trigger reset.
Among Fig. 5, signal indicating circuit comprises trigger, capacitance-resistance time-delay reset circuit, acousto-optic indicating circuit institute, and wherein trigger U2B has an input contact, an output contact, the high level signal that logic judging circuit is sent here is sent into input contact 11 pin of trigger U2B, and is exported by 13 pin; Form time-delay reset circuit by R11, C10, form the acousto-optic indicating circuit by R12, T3, R13, D9, wherein D9 is the light emitting-type element.When trigger 13 pin are high level, make the T3 collector to the emitter conducting by R12, make the D9 flashing light alarm by R13, the indicating circuit fault; Charge to C10 by R11 after reporting to the police, when C10 is charged as high level, high level signal is delivered to 10 pin of U2B with trigger reset.
In the above-mentioned embodiment, the phase inverter that is adopted, model can be 40106, the trigger that is adopted, model can be 4013.
Claims (5)
1. overhead high voltage line earth-fault detecting method is characterized in that:
(1) sampling sensor is set on high-tension line, described sampling sensor comprises capacitance current sample circuit and lead voltage of electric field sample circuit; The output terminal of capacitance current sample circuit and lead voltage of electric field sample circuit is connected with two input ends of a logic judging circuit respectively, and the output terminal of logic judging circuit connects the input end of a signal indicating circuit;
(2) the electric current capacitance variations information by capacitance current sample circuit inductive grounding instantaneous pressure circuit, and send the input end of a high level to logic judging circuit at its output terminal;
(3) send a high level another input end to logic judging circuit by the lead voltage of electric field sample circuit induction high-tension line ground connection change in voltage information of moment, and at its output terminal;
(4) signal sent here according to capacitance current sample circuit and lead voltage of electric field sample circuit of logic judging circuit judges that when the two was high level, logic judging circuit was sent a high level to signal indicating circuit at its output terminal;
(5) when the input end of signal indicating circuit was high level, signal indicating circuit promptly sent the grounding alarm signal.
2. fault detection method according to claim 1 is characterized in that: described capacitance current sample circuit comprises current sensor, rectifier filer, signal output apparatus, and its effect is a sampling ground connection moment capacitance current; Current sensor is a magnet ring that is wound with coil, this magnet ring is set in the top in institute survey line highway section, two termination rectifier filers of coil, when circuit generation earth fault, the immediate current sudden change, the coil two ends HF voltage of will inducting, this HF voltage direction with moment the mutation current direction relevant, through rectifier filer filtering low frequency part, according to the induced potential direction, if induced potential and electric current homophase are then exported high level to logic judging circuit at the output terminal of signal output apparatus.
3. fault detection method according to claim 1, it is characterized in that: described voltage of electric field sample circuit be by after the series connection of two diodes again with a resistance capacitance and connect an electric capacity and isolate, the positive pole of one of them diode and the negative pole of another diode connect the magnet ring of current sensor with lead, promptly connect the power transmission line of surveying, its output signal connects a phase inverter through the triode conducting, signal is delivered to logic judging circuit after anti-phase, the positive pole of another diode connects power cathode and connects a copper sheet unsettled, and the effect of this copper sheet is that the earth is formed an electric capacity.
4. fault detection method according to claim 1, it is characterized in that: described logic judging circuit comprises trigger and capacitance-resistance time-delay reset circuit, trigger has output terminal of two input ends, when trigger receives the high level that high level that the capacitance current sample circuit sends here and voltage of electric field sample circuit are sent here, trigger output high level is given signal indicating circuit, and the capacitance-resistance time-delay reset circuit, the capacitance-resistance time-delay reset circuit is with trigger reset.
5. fault detection method according to claim 1, it is characterized in that: described signal indicating circuit comprises trigger, capacitance-resistance time-delay reset circuit, acousto-optic indicating circuit, when receiving current/voltage, the trigger input end judges the high level signal of sending here, the trigger output terminal is sent high level to acousto-optic indicating circuit and capacitance-resistance time-delay reset circuit, the acousto-optic indicating circuit sends sound and light alarm indication short trouble, and the capacitance-resistance time-delay reset circuit is with trigger reset then.
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| CN2011101417475A CN102221664A (en) | 2011-05-30 | 2011-05-30 | Grounding fault detection method of overhead high voltage circuit |
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| CN2011101417475A CN102221664A (en) | 2011-05-30 | 2011-05-30 | Grounding fault detection method of overhead high voltage circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102647032A (en) * | 2012-04-12 | 2012-08-22 | 向渝 | Suspension power supply started by micro-current |
| CN103018628A (en) * | 2012-11-20 | 2013-04-03 | 山西省电力公司阳泉供电公司 | Tower grounding detection device |
| CN104007362A (en) * | 2014-05-12 | 2014-08-27 | 国家电网公司 | Pole and tower power transmission line fault indicator |
| CN105021937A (en) * | 2014-04-28 | 2015-11-04 | 苏州华天国科电力科技有限公司 | Detector for temporary grounding wire of 10kV high-voltage line |
| CN107607830A (en) * | 2017-09-13 | 2018-01-19 | 广西电网有限责任公司电力科学研究院 | A kind of electrical equipment protective grounding state continuous monitoring method |
| CN108738351A (en) * | 2016-02-12 | 2018-11-02 | 施耐德电器工业公司 | The equipment of the electrical quantity of one phase of the AC electric currents for measuring aerial electrical network |
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| CN1295254A (en) * | 1999-11-08 | 2001-05-16 | 赵世红 | Single-phase earthing-fault display method and instrument for power supply line |
| CN101718832A (en) * | 2009-11-17 | 2010-06-02 | 深圳市科陆电子科技股份有限公司 | High-voltage line fault detection device and detection method |
| CN101738565A (en) * | 2010-01-14 | 2010-06-16 | 北京双杰电气股份有限公司 | Adaptive fault indicator |
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2011
- 2011-05-30 CN CN2011101417475A patent/CN102221664A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295254A (en) * | 1999-11-08 | 2001-05-16 | 赵世红 | Single-phase earthing-fault display method and instrument for power supply line |
| CN101718832A (en) * | 2009-11-17 | 2010-06-02 | 深圳市科陆电子科技股份有限公司 | High-voltage line fault detection device and detection method |
| CN101738565A (en) * | 2010-01-14 | 2010-06-16 | 北京双杰电气股份有限公司 | Adaptive fault indicator |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102647032A (en) * | 2012-04-12 | 2012-08-22 | 向渝 | Suspension power supply started by micro-current |
| CN102647032B (en) * | 2012-04-12 | 2015-10-21 | 向渝 | A kind of suspended power supply of micro-current start |
| CN103018628A (en) * | 2012-11-20 | 2013-04-03 | 山西省电力公司阳泉供电公司 | Tower grounding detection device |
| CN103018628B (en) * | 2012-11-20 | 2015-04-29 | 山西省电力公司阳泉供电公司 | Tower grounding detection device |
| CN105021937A (en) * | 2014-04-28 | 2015-11-04 | 苏州华天国科电力科技有限公司 | Detector for temporary grounding wire of 10kV high-voltage line |
| CN104007362A (en) * | 2014-05-12 | 2014-08-27 | 国家电网公司 | Pole and tower power transmission line fault indicator |
| CN108738351A (en) * | 2016-02-12 | 2018-11-02 | 施耐德电器工业公司 | The equipment of the electrical quantity of one phase of the AC electric currents for measuring aerial electrical network |
| CN107607830A (en) * | 2017-09-13 | 2018-01-19 | 广西电网有限责任公司电力科学研究院 | A kind of electrical equipment protective grounding state continuous monitoring method |
| CN107607830B (en) * | 2017-09-13 | 2021-07-20 | 广西电网有限责任公司电力科学研究院 | Method for continuously monitoring protective grounding state of electrical equipment |
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Application publication date: 20111019 |