CN112557805A - Auxiliary device and method for quickly searching faults of overhead line - Google Patents
Auxiliary device and method for quickly searching faults of overhead line Download PDFInfo
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- CN112557805A CN112557805A CN202011178895.XA CN202011178895A CN112557805A CN 112557805 A CN112557805 A CN 112557805A CN 202011178895 A CN202011178895 A CN 202011178895A CN 112557805 A CN112557805 A CN 112557805A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005259 measurement Methods 0.000 claims abstract description 17
- 238000012360 testing method Methods 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000009194 climbing Effects 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 7
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013024 troubleshooting Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
Abstract
The invention provides an auxiliary device and a method for quickly searching faults of an overhead line, wherein the auxiliary device comprises a high-voltage input port, three ammeters, an intermediate relay and three output ends; the high-voltage input port is connected with high-voltage direct current; the high-voltage direct current is divided into three paths of branch currents, and the three paths of branch currents are connected to one ends of three normally open contacts of the intermediate relay after passing through three ammeters respectively; and the other ends of the three normally open contacts of the intermediate relay are respectively connected with three output ends. The invention solves the problems that a large amount of manpower and material resources are consumed by searching for hidden and high-resistance ground faults by manually climbing the pole and releasing strain-resistant drainage jumper wires by climbing the pole. And sectional shaking measurement is not needed, so that the fault range is prevented from being enlarged.
Description
Technical Field
The invention relates to the field of power detection and monitoring, in particular to an auxiliary device and method for quickly searching faults of an overhead line.
Background
Most of the existing 10kV distribution lines adopt a three-phase three-wire power supply mode with ungrounded neutral points. The power supply mode of the distribution line changes the insulation level of the distribution line, reduces the trip rate of the distribution line and improves the power supply reliability. However, in actual operation, a new power supply mode is adopted, so that single-phase earth faults frequently occur, especially, under severe weather conditions such as strong wind, thunderstorm and the like, the earth faults frequently occur, and the safe and economic operation of the power transformation equipment and the power distribution network is seriously influenced.
When a line ground fault occurs, the binary method is usually adopted to check that the line has no section switch, knife switch and link. When a hidden and high-resistance grounding fault occurs, the traditional methods of checking towers one by one, climbing the tower, unfastening the drainage wire head of the tension rod, pulling the transformers one by one and the like are required. The troubleshooting method is time-consuming and labor-consuming, and is difficult to find out fault points, so that the power supply reliability is influenced. When the fault of a plurality of lines is tripped in special weather, sometimes the call and scheduling contact can not be connected for a long time, the operation of the scheduling command is waited to be received, time is consumed, the reliability of power supply is influenced, and the workload of scheduling is increased. When a line has a ground fault, a general megger and a direct current trial-sending instrument pull open a section link or a disconnecting link and then shake for finding a ground fault point. The line fault is checked by using a megger and a direct current trial-sending instrument, namely the line is repeatedly pulled from a main line or a branch line and then is sectional-shaken, so that a knife switch on a column, a cocker spring are deformed and have insufficient pressure, a porcelain sleeve is manually impacted and damaged, and the fault range is expanded.
Disclosure of Invention
The invention aims to provide an auxiliary device and a method for quickly searching faults of an overhead line, which can solve the problems that in the prior art, manual pole climbing is needed to search for ground faults, pole climbing is needed to unlock strain-resistant drainage jumper wires, a large amount of manpower and material resources are consumed, and the fault range is expanded due to sectional shaking detection.
The purpose of the invention is realized by the following technical scheme:
in a first aspect, the invention provides an auxiliary device for quickly searching faults of an overhead line, which comprises a high-voltage input port, three ammeters, an intermediate relay and three output ends; the high-voltage input port is connected with high-voltage direct current; the high-voltage direct current is divided into three paths of branch currents, and the three paths of branch currents are connected to one ends of three normally open contacts of the intermediate relay after passing through three ammeters respectively; and the other ends of the three normally open contacts of the intermediate relay are respectively connected with three output ends.
Furthermore, the auxiliary device for rapidly searching the overhead line faults further comprises three measuring leads, and the three measuring leads are connected to the three output ends respectively.
Furthermore, auxiliary device is seeked fast to overhead line trouble still includes the take-up reel for the rolling measurement lead wire.
Furthermore, the auxiliary device is looked for fast to overhead line trouble still includes the instrument board for the inside components and parts of auxiliary device are looked for fast to the protection overhead line trouble, and look over the reading of three ampere meters through the display window.
In a second aspect, the present invention provides a method for quickly finding faults of an overhead line, including the following steps:
step 2, inputting the high-voltage direct current into an auxiliary device, and dividing the high-voltage direct current into three branches;
step 3, connecting the three branch currents to one end of a normally open contact of a built-in intermediate relay of the auxiliary device after passing through an ammeter respectively;
step 4, the intermediate relay is electrified, the normally open contact is closed, and three branches of current are injected into three high-voltage lines through three measuring leads respectively;
and 5, if a certain ammeter has a reading, the high-voltage line of the line is a fault line.
Further, the method for quickly searching the faults of the overhead line further comprises the following steps of searching fault points:
and detecting on a fault line by using the wireless high-voltage clamp meter, wherein if the wireless high-voltage clamp meter at a certain test point has a reading, the fault point is still on a rear-section line, and if the wireless high-voltage clamp meter at the test point has no reading, the rear-section line at the test point has no fault.
Furthermore, the auxiliary device comprises a high-voltage input port, three ammeters, an intermediate relay and three output ends; the high-voltage input port is connected with high-voltage direct current output by the direct current trial transmission instrument; the high-voltage direct current is divided into three paths of branch currents, the three paths of branch currents are connected to one ends of three normally open contacts of the intermediate relay after passing through the three ammeters respectively, and the other ends of the three normally open contacts of the intermediate relay are connected with three output ends of the auxiliary device respectively.
The auxiliary device and the method for quickly searching the faults of the overhead line are combined with a direct-current ground fault positioning technology, a low-current ground fault positioning technology and a method for manually injecting low-frequency high-voltage direct-current three-phase power to technically update a single-phase ground fault searching operation method of a 10kV line, analysis is carried out according to the output characteristics of direct current, a major breakthrough is obtained, and the problem that a large amount of manpower and material resources are consumed due to the fact that a person needs to manually climb a pole to search the ground fault and climb the pole to untie a drainage jumper is solved.
Drawings
FIG. 1 is a schematic structural diagram of an auxiliary device for rapid fault finding of an overhead line according to the present invention;
FIG. 2 is a schematic circuit diagram of the overhead line fault quick look-up aid of the present invention;
FIG. 3 is one of the schematic diagrams of the applied circuit of the auxiliary device for fast fault finding of the overhead line of the present invention;
FIG. 4 is a second schematic diagram of an applied circuit of the auxiliary device for fast fault finding of an overhead line according to the present invention;
fig. 5 is a method step diagram of the fast overhead line fault finding of the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The invention discloses an auxiliary device for quickly searching faults of an overhead line. The high-voltage input port is connected with the high-voltage direct current output by the direct current trial transmission instrument. The high-voltage direct current is divided into three paths of branch currents, the three paths of branch currents are connected to one ends of three normally open contacts of the intermediate relay after passing through the three ammeters respectively, and the other ends of the three normally open contacts of the intermediate relay are connected with three output ends of the auxiliary device respectively.
Further, in a preferred embodiment of the present application, the auxiliary device for fast finding an overhead line fault further includes three measurement leads, and the three measurement leads are respectively connected to three output ends of the auxiliary device.
Further, in the preferred embodiment of this application, overhead line trouble looks for auxiliary device fast still includes the take-up reel for the rolling measurement lead wire.
Further, in the preferred embodiment of this application, overhead line trouble seeks auxiliary device fast still includes the instrument board for the inside components and parts of protection overhead line trouble seeks auxiliary device fast, and look over the reading of three ampere meters through the display window.
The structural schematic diagram of the auxiliary device for quickly searching the overhead line fault is shown in fig. 1, wherein 1 is an auxiliary device bracket which is a device main body supporting part. 2 is take-up reel, possesses the rolling and measures the lead wire function. And 3, the instrument panel adopts a 3240 epoxy plate resin plate, so that the instruments are fixed and mutually insulated. Reference numeral 4 denotes a first of the three ammeters, phase a meter a1, which shows the leakage current value of phase a. And 5 is the second of the three ammeters, a phase B instrument A2, and shows the leakage current value of the phase B. Reference numeral 6 denotes the third of the three ammeters, phase C instrument a3, which shows the leakage current value of phase C. The three ammeters and the intermediate relay are arranged under the instrument panel, and the instrument panel protects the three ammeters and the intermediate relay from being interfered by the external environment. The display window of the instrument panel is arranged right above the three ammeters, and the readings of the ammeters can be seen through the display window. And 7, a high-voltage plug of a thread high-voltage plug is connected in series with the high-voltage output end of the direct-current trial delivery instrument. 8 is 220V power supply pin plug, and is connected with 220V alternating current, supplies power for built-in intermediate relay 11. And 9, an ABC three-phase measurement lead wire which is led out from the output end of the auxiliary device, is lapped with a 10kV line and transmits voltage to the 10kV line. The auxiliary device 10 is portable and convenient to carry. Reference numeral 11 denotes a built-in intermediate relay, which is connected to the measurement lead 9. The normally open contact of the built-in intermediate relay 11 has the functions of switching on the measurement lead 9 for fault measurement when the power is off, switching on the normally closed contact of the built-in intermediate relay 11, automatically discharging the measurement lead to a fault line through a direct current trial transmission instrument, and protecting the three ammeters from current impact. 3 measurement hooks 12 are arranged at the tail ends of the measurement leads and used for being lapped with a high-voltage line to be detected.
Fig. 2 is a schematic circuit diagram of an auxiliary device of the present invention, and the operation principle of the present invention is described as follows in conjunction with fig. 2:
high-voltage direct current output by the existing direct current test transmission instrument is divided into three paths, and the three paths of high-voltage direct current are respectively injected into one end of three normally open contacts K2, one end of K4 and one end of K6 of an intermediate relay through an A-phase instrument, a B-phase instrument and a C-phase instrument. K2, K4 and K6 are three normally open contacts of the intermediate relay, and K1, K3 and K5 are three normally closed contacts of the intermediate relay. The other ends of the three normally-open contacts K2, K4 and K6 are used as three output ends of an auxiliary device and are respectively connected with a three-phase 10kV line to be detected. The intermediate relay is powered by 220V alternating current. When the intermediate relay is energized, the normally open contacts K2, K4, and K6 are closed, and the normally closed contacts are opened. The three branch currents are respectively injected into 10kV lines of A phase, B phase and C phase through meters A1, A2 and A3. When one line has a ground fault, the line is grounded to generate a loop, and the meter on the line has a leakage current value display. There is no faulty line and the meter has no reading. Therefore, the fault phase can be accurately judged, a lot of troubleshooting work is saved, the workload is reduced, and the operations of manually climbing a pole to search for the ground fault, climbing the pole to untie the tension-resistant drainage jumper and the like are not needed. And sectional shaking measurement is not needed, so that the fault range is prevented from being enlarged. When the power is off, the built-in intermediate relay of the auxiliary device can also play a role in automatically discharging the line. After the power is cut off, the current injected into the circuit can be discharged through the grounding of the direct current trial sending instrument, and the three current instruments are protected.
Fig. 3 and 4 are schematic views of the application of the auxiliary device of the present invention. In fig. 3, the measurement lead of the auxiliary device of the present invention is unfastened, the high voltage output end of the dc trial transmission instrument is connected to the high voltage input end of the auxiliary device, and then the three-phase measurement lead of the auxiliary device is lapped on the line whose line fault is changed to cold standby one by one. And (4) connecting a 220V alternating current power supply to the auxiliary device, and electrifying the fault line to operate according to the operation steps of the direct current trial instrument. When the C phase has a ground fault, the leakage current of the phase is displayed on the auxiliary device instrument, and the fault phase can be quickly judged. In order to accurately locate the fault point, the Bo-ampere-grade wireless high-voltage clamp meter is matched with the ground fault point to search for the ground fault point, and the line fault point can be rapidly searched through the numerical value of the wireless high-voltage clamp meter. The wireless high-voltage clamp meter before the fault point has a reading, and the wireless high-voltage clamp meter after the fault point has no reading.
The invention also provides a method for quickly searching faults of the overhead line, which comprises the following steps:
The utilization of a DC trial-sending instrument to output high-voltage DC belongs to the prior art, and the step is not specifically explained.
And 2, inputting the high-voltage direct current into an auxiliary device, and dividing the high-voltage direct current into three branches of current.
And 3, connecting the three branch currents to one end of a normally open contact of a built-in intermediate relay of the auxiliary device after passing through an ammeter respectively.
And 4, electrifying the intermediate relay, closing the normally open contact, and injecting the three branches of current into the three high-voltage lines through the three measuring leads respectively.
And 5, if a certain ammeter has a reading, the high-voltage line of the line is a fault line.
Further, in a preferred embodiment of the present application, the auxiliary device includes a high voltage input port, three ammeters, an intermediate relay, and three output terminals. The high-voltage input port is connected with the high-voltage direct current output by the direct current trial transmission instrument. The high-voltage direct current is divided into three paths of branch currents, the three paths of branch currents are connected to one ends of three normally open contacts of the intermediate relay after passing through the three ammeters respectively, and the other ends of the three normally open contacts of the intermediate relay are connected with three output ends of the auxiliary device respectively.
Further, in a preferred embodiment of the present application, the method further includes the step of finding a fault point:
and detecting on a fault line by using the wireless high-voltage clamp meter, wherein if the wireless high-voltage clamp meter at a certain test point has a reading, the fault point is still on a rear-section line, and if the wireless high-voltage clamp meter at the test point has no reading, the rear-section line at the test point has no fault.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.
Claims (7)
1. The auxiliary device for quickly searching the faults of the overhead line is characterized by comprising a high-voltage input port, three ammeters, an intermediate relay and three output ends; the high-voltage input port is connected with high-voltage direct current; the high-voltage direct current is divided into three paths of branch currents, and the three paths of branch currents are connected to one ends of three normally open contacts of the intermediate relay after passing through three ammeters respectively; and the other ends of the three normally open contacts of the intermediate relay are respectively connected with three output ends.
2. The overhead line fault quick-finding auxiliary device of claim 1 further comprising three measurement leads connected to three output terminals respectively.
3. The overhead line fault quick-finding auxiliary device according to claim 2, further comprising a take-up reel for taking up the measurement lead.
4. The overhead line fault quick-finding auxiliary device according to claim 1, further comprising an instrument panel for protecting internal components of the overhead line fault quick-finding auxiliary device and viewing readings of the three ammeters through a display window.
5. The method for quickly searching the faults of the overhead line is characterized by comprising the following steps:
step 1, outputting high-voltage direct current by using a direct current trial delivery instrument;
step 2, inputting the high-voltage direct current into an auxiliary device, and dividing the high-voltage direct current into three branches;
step 3, connecting the three branch currents to one end of a normally open contact of a built-in intermediate relay of the auxiliary device after passing through an ammeter respectively;
step 4, the intermediate relay is electrified, the normally open contact is closed, and three branches of current are injected into three high-voltage lines through three measuring leads respectively;
and 5, if a certain ammeter has a reading, the high-voltage line of the line is a fault line.
6. The overhead line fault rapid-finding method of claim 5, further comprising the step of finding a fault point:
and detecting on a fault line by using the wireless high-voltage clamp meter, wherein if the wireless high-voltage clamp meter at a certain test point has a reading, the fault point is still on a rear-section line, and if the wireless high-voltage clamp meter at the test point has no reading, the rear-section line at the test point has no fault.
7. The overhead line fault fast-finding method according to claim 5 or 6, characterized in that the auxiliary device comprises a high-voltage input port, three ammeters, an intermediate relay and three output terminals; the high-voltage input port is connected with high-voltage direct current output by the direct current trial transmission instrument; the high-voltage direct current is divided into three paths of branch currents, the three paths of branch currents are connected to one ends of three normally open contacts of the intermediate relay after passing through the three ammeters respectively, and the other ends of the three normally open contacts of the intermediate relay are connected with three output ends of the auxiliary device respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011178895.XA CN112557805A (en) | 2020-10-29 | 2020-10-29 | Auxiliary device and method for quickly searching faults of overhead line |
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| CN202011178895.XA CN112557805A (en) | 2020-10-29 | 2020-10-29 | Auxiliary device and method for quickly searching faults of overhead line |
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| CN112557805A true CN112557805A (en) | 2021-03-26 |
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| CN202011178895.XA Pending CN112557805A (en) | 2020-10-29 | 2020-10-29 | Auxiliary device and method for quickly searching faults of overhead line |
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Cited By (1)
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| CN113295965A (en) * | 2021-05-25 | 2021-08-24 | 国网山东省电力公司济南市济阳区供电公司 | Distribution network ground fault positioning method, system and terminal |
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