CN105486975B - It is a kind of to 10kV distribution single-phase earth fault detecting methods - Google Patents
It is a kind of to 10kV distribution single-phase earth fault detecting methods Download PDFInfo
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- CN105486975B CN105486975B CN201510805468.2A CN201510805468A CN105486975B CN 105486975 B CN105486975 B CN 105486975B CN 201510805468 A CN201510805468 A CN 201510805468A CN 105486975 B CN105486975 B CN 105486975B
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- 238000009826 distribution Methods 0.000 title claims abstract description 16
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- 238000005259 measurement Methods 0.000 claims abstract description 4
- 239000004973 liquid crystal related substance Substances 0.000 claims description 9
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Classifications
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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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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Abstract
The invention discloses a kind of to 10KV distribution single-phase earth fault detecting methods, step 1, alien frequencies detection signal is injected to singlephase earth fault circuit using signal generation apparatus；Step 2, the alien frequencies detection signal and load signal of earth fault line are detected using signal picker, position singlephase earth fault scene；Step 3, the measurement data detected by locator reception signal collector is received using signal, and data real-time display is come out, be simultaneously emitted by position data to indicate the position of trouble point.The present invention to 10KV distribution single-phase earth fault detecting methods, by Step 1: the setting of step 2 and step 3, can to faulty line effectively by injecting alien frequencies detection signal, and receive locator using signal picker and signal and detect the signal, so as to learn the failure scene of faulty line, it becomes possible to fast and effectively find trouble point.
Description
Technical field
It is more particularly to a kind of to 10KV distribution single-phase earthings the present invention relates to a kind of electric network fault detection method
Fault detection method.
Background technology
In recent years, with the implementation of electric network reconstruction engineering, the change of 10kV distribution line power supply modes, distribution is enhanced
The dielectric level of circuit, the trip-out rate of distribution line is reduced, improves power supply reliability, reduces line loss.But take
New power supply mode is in actual motion, frequent generation singlephase earth fault, is particularly disliked in strong wind, heavy rain, hail, snow etc.
Under bad weather condition, earth fault frequently occurs, and has had a strong impact on safety, the economical operation of transformer and power distribution network.Failure
After generation, because line length scope is wide, using piecewise push-and-pull by rule of thumb, is segmented in the past, the conventional method such as shaft tower inspection is carried out step by step
Investigation, wastes time and energy, and power failure range is big, time length, it is difficult to quick and precisely find trouble point.
The content of the invention
In view of the deficienciess of the prior art, it is an object of the invention to provide one kind can quick and precisely find trouble point
To 10kV distribution single-phase earth fault detecting methods.
To achieve the above object, the invention provides following technical scheme：It is a kind of that 10KV distributions singlephase earth fault is examined
Survey method,
Step 1, alien frequencies detection signal is injected to singlephase earth fault circuit using signal generation apparatus；
Step 2, the alien frequencies detection signal and load signal of earth fault line are detected using signal picker, and positioning is single
Phase earth fault scene；
Step 3, the measurement data detected by locator reception signal collector is received using signal, and data are real
When show, be simultaneously emitted by position data to indicate the position of trouble point.
As a further improvement on the present invention, signal generation apparatus includes timing chip used by above-mentioned steps one, should
Chip has discharge end and output end, and the discharge end is coupled with rheostat, and described rheostatic one end is coupled with the 7th resistance
After be coupled to power supply, the other end is grounded after coupling the first electric capacity, the timing chip also have low triggering end and high-triggering end and
Control voltage end, the low triggering end and high-triggering end are coupled between rheostat and the first electric capacity, the low triggering end and
Diode is coupled between discharge end, the control voltage end is grounded after being coupled with the second electric capacity, and the output end is coupled with hair
It is grounded after optical diode, has been also coupled to the first operational amplifier, the in-phase input end and timing chip of first operational amplifier
Output end coupling, inverting input is grounded after being coupled with second resistance, and the output end of first operational amplifier is coupled with
Second resistance is coupled to after first resistor, and is further coupled to faulty line.
As a further improvement on the present invention, the rheostat includes base and the rotating disk electrically connected with timing chip,
One end of the base offers swivelling chute, and the rotating disk is embedded into swivelling chute, along the circle of swivelling chute on the base
All edges are placed with several and are embedded in embedding hole for the resistance of different resistances, are offered on the cell wall of the swivelling chute with embedding hole one by one
Corresponding through hole, the circumferential edge of the rotating disk is provided with hemispherical contact, when resistance value is needed, rotating disk insertion
Into swivelling chute, hemispherical contact passes through one of the resistance electrical connection in through hole and embedding hole corresponding with the through hole, the rotation
Rotating disk is also coaxially fixed with column spinner backwards to one end of base, and the side of the column spinner is further opened with anti-slip veins.
As a further improvement on the present invention, the signal picker employed in above-mentioned steps two includes transformer, second
Operational amplifier and the 3rd operational amplifier, the transformer are hand-held transformer, the secondary end of the transformer and second
In-phase input end and the inverting input coupling of operational amplifier, the inverting input of second operational amplifier have been also coupled to
It is grounded after 4th resistance, the output end of second operational amplifier is coupled to the 4th resistance after being coupled with 3rd resistor, goes back coupling
It is connected to the inverting input that the 3rd operational amplifier is coupled to after the 5th resistance, the inverting input of the 3rd operational amplifier
It is also coupled to be coupled to after the 6th resistance and the 3rd electric capacity parallel with one another the output end of the operational amplifier, the 3rd computing
The in-phase input end ground connection of amplifier, output end are coupled with zigbee modules and receive locator communication with signal.
As a further improvement on the present invention, the signal that above-mentioned steps three use, which receives locator, includes control CPU, liquid crystal
Display, 4G modules, GPRS module and zigbee modules, the control CPU couple with signal picker, the 4G modules, liquid
Crystal display, GPRS module couple with control CPU, when signal picker collects data and is input in control CPU
Wait, control CPU shows the data by liquid crystal display, and obtains location position data by GPRS module, then passes through 4G
Module sends position data.
The invention has the advantages that when line fault, pass through the setting of step 1, it is possible to effective
Using signal generation apparatus, alien frequencies detection signal is injected into faulty line, the alien frequencies detection signal will be in faulty line
Circulation, alien frequencies detection signal is at this moment detected along faulty line using signal picker again, at the same the data detected are real-time
The signal that is sent to receive locator, signal receives locator and will show these data in real time, when detecting certain
When the point left and right sides, there is this alien frequencies signal side, when opposite side does not have, it is determined that and it is exactly fault ground point that this point, which is,
Now signal receives locator and will detect the position data of the point, then sends console, thus can
Enough trouble points for promptly and accurately and effectively determining circuit.
Brief description of the drawings
Fig. 1 is the circuit diagram of the signal generation apparatus of the present invention；
Fig. 2 is the circuit diagram of the signal picker of the present invention；
Fig. 3 is that the signal of the present invention receives the module map of locator；
Fig. 4 is rheostatic overall structure figure in Fig. 1.
Embodiment
Referring to figs. 1 to shown in 4, a kind of of the present embodiment exists to 10kV distribution single-phase earth fault detecting methods, its feature
In：
Step 1, alien frequencies detection signal is injected to singlephase earth fault circuit using signal generation apparatus 1；
Step 2, the alien frequencies detection signal and load signal of earth fault line are detected using signal picker 2, and positioning is single
Phase earth fault scene；
Step 3, the measurement data detected by the reception signal collector of locator 3 is received using signal, and data are real
When show, be simultaneously emitted by position data to indicate the position of trouble point, it is logical first when earth fault occurs for circuit
Cross signal generation apparatus 1 and inject alien frequencies detection signal to faulty line, such alien frequencies detection signal will be inside faulty line
Flowing, at this moment can collects the alien frequencies detection signal of faulty line internal circulation by signal picker 2, when detecting certain
When the point left and right sides, there is this alien frequencies signal side, when opposite side does not have, it is determined that and it is exactly fault ground point that this point, which is,
Now signal receives locator 3 and will detect the position data of the point, then sends console, thus can
Enough trouble points for promptly and accurately and effectively determining circuit, it is middle by the way of artificial experience compared with prior art, it is quick
It is accurately more.
As a kind of improved embodiment, signal generation apparatus 1 includes timing core used by above-mentioned steps one
Piece U1, the chip have discharge end and output end, and the discharge end is coupled with rheostat RP, the rheostat RP one end coupling
Power supply is coupled to after having the 7th resistance R7, the other end is grounded after coupling the first electric capacity C1, and timing chip U1 also has low triggering
End and high-triggering end and control voltage end, the low triggering end and high-triggering end are coupled to rheostat RP and the first electric capacity C1
Between, diode D is coupled between the low triggering end and discharge end, the control voltage end is coupled with the second electric capacity C2 and is followed by
Ground, the output end are grounded after being coupled with LED, have been also coupled to the first operational amplifier Q1, and first computing is put
The output end of big device Q1 in-phase input end and timing chip U1 is coupled, and inverting input is grounded after being coupled with second resistance R2,
The output end of the first operational amplifier Q1 is coupled to second resistance R2 after being coupled with first resistor (R1), and is further coupled to event
Hinder circuit, when signal generation apparatus 1 works, its internal circuit will be connected, and at this moment power supply will pass through the 7th resistance
R7 and rheostat RP charges to the first electric capacity C1, while timing chip U1 discharge end closing, output end output high level, because
In the presence of charging, the first electric capacity C1 terminal voltage will be raised constantly, and the terminal voltage can constantly be input to low touch
In originator and high-triggering end, when the trigger voltage of high-triggering end is arrived in the first electric capacity C1 terminal voltage lifting, timing chip
U1 will be acted, and discharge end is opened, while output end is changed to export low level, then now the first electric capacity C1 will pass through change
Hinder device RP to discharge to discharge end, then the first electric capacity C1 terminal voltage will slowly decline, when terminal voltage drops to low triggering
When end, timing chip U1 will be acted, and discharge end is closed, while output end is changed to export high level, the first electric capacity C1 again
Terminal voltage continue to rise, when high-triggering end is risen to, timing chip U1 can be acted again, repeat above-mentioned action, output
Low level can be changed into again again, such timing chip U1 output end will export a square wave, and the frequency of the ripple can lead to
Overregulate rheostat RP resistance, and then adjust the first electric capacity C1 discharge and recharge time to realize, thus effectively realize
The effect that one signal occurs, the frequency used in the present embodiment is low frequency, and by the setting of LED,
Can allows people to know the signal output situation of signal generation apparatus 1 so that people timely and effectively can be adjusted to it.
As a kind of improved embodiment, the rheostat RP includes base 4 and electrically connected with timing chip U1
Rotating disk 5, one end of the base 4 offers swivelling chute 41, and the rotating disk 5 is embedded into swivelling chute 41, the base 4
On along the circumferential edge of swivelling chute 41 along several resistance for different resistances are placed be embedded in embedding hole 411, the swivelling chute 41
Cell wall on offer and be provided with hemispherical contact with the one-to-one through hole 412 in embedding hole 411, the circumferential edge of the rotating disk 5
51, when resistance value is needed, rotating disk 5 is embedded into swivelling chute 41, and hemispherical contact 51 passes through one of through hole
412 and embedding hole 411 corresponding with the through hole 412 in resistance electrical connection, the rotating disk 5 is also coaxially solid backwards to one end of base 4
Surely there is column spinner 52, the side of the column spinner 52 is further opened with anti-slip veins, is needing the output frequency of change signal generation apparatus 1
When rate, that is, when changing rheostat RP access resistance, it is only necessary to hold column spinner 52, then turn column spinner
52 so that column spinner 52 drives rotating disk 5 in the internal rotation of swivelling chute 41, and while rotation, hemispherical contact 51 also can be with
Rotate together, hemispherical contact 51 rotate during, will be one by one be embedded into through hole 412, when hemispherical contact
51 when be embedded into a through hole 412, and resistance that will be in embedding hole 411 corresponding with the through hole 412 is in contact, and at this moment accesses
Resistance in circuit is just the resistance of the resistance, when hemispherical contact 51 is embedded into another through hole 412, Jiu Huiyu
Ohmic contact corresponding to the through hole 412 in embedding hole 411, the resistance at this moment accessed in circuit are just the resistance of this resistance, such as
This just can be good at playing a part of a conversion resistance, and the resistance converted is fixed resistance, thus would not go out
Now using conventional rheostat occur can not by resistance conversion to a suitable resistance the problem of.
As a kind of improved embodiment, the signal picker 2 employed in above-mentioned steps two includes transformer
L, the second operational amplifier Q2 and the 3rd operational amplifier Q3, the transformer L are hand-held transformer, the transformer L's
Secondary end and the second operational amplifier Q2 in-phase input end and inverting input couple, and the second operational amplifier Q2's is anti-
Phase input is grounded after being also coupled to the 4th resistance R4, and the output end of the second operational amplifier Q2 is coupled with 3rd resistor R3
After be coupled to the 4th resistance R4, be also coupled to be coupled to after the 5th resistance R5 the 3rd operational amplifier Q3 inverting input, institute
State the 3rd operational amplifier Q3 inverting input be also coupled to the 6th resistance R6 and the 3rd electric capacity C3 parallel with one another after couple
In the output end of the operational amplifier, the in-phase input end of the 3rd operational amplifier Q3 is grounded, and output end is coupled with
Zigbee modules and signal receive locator 3 and communicated, signal generation apparatus 1 by alien frequencies signal be injected into faulty line when
Wait, people's can is held signal picker 2 and detected all the way along faulty line, during detection, it is only necessary to by mutual inductance
Device L presses close to faulty line, because when thering is Injection Signal to flow through in faulty line, will be around faulty line
Magnetic field is formed, such transformer L cans effectively induce electric current, after transformer L induces electric current, pass through the second fortune
Calculate amplifier Q2 cans to be effectively amplified the transformer L electric currents induced, simultaneously because what the present embodiment used
It is low frequency signal, thus a low pass filter is formed using the 3rd operational amplifier Q3 herein, so can be with effective
Ensure that it is Injection Signal to be transferred to the signal that signal is received in locator 3, rather than other interference signals so as to trouble point
Positioning is more accurate, and passes through the setting of zigbee modules, it is possible to it is effective realize with signal receive locator 3 it
Between wireless telecommunications, one is not readily susceptible to the interference of faulty line, two come during detection generic failure circuit can compare
It is higher, can be very inconvenient if being connected by the way of wire.
As a kind of improved embodiment, the signal that above-mentioned steps three use, which receives locator 3, includes control
CPU, liquid crystal display, 4G modules, GPRS module and zigbee modules, the control CPU couples with signal picker 2, described
4G modules, liquid crystal display, GPRS module couple with control CPU, when signal picker 2 collects data and is input to control
When in CPU, control CPU shows the data by liquid crystal display, and obtains location position data by GPRS module, so
Position data is sent by 4G modules afterwards, after signal picker 2 arrives signal acquisition, zigbee moulds will be passed through
Block sends a signal to signal and receives locator 3, and the zigbee modules that signal receives inside locator 3 will receive these letters
Number, in appearance while alien frequencies signal can be measured, when another side can not measure, at this moment mean that and have been positioned at faulty line
On trouble point, thus at this time GPRS module will obtain the position data of the trouble point, then be sent by 4G modules
Go out, the position data of the trouble point of faulty line thus can be effectively learnt, is passed through compared to using in the prior art
The method that the mode tested carrys out failure judgement point is fast and accurately more.
In summary, it is of the invention to 10kV distribution single-phase earth fault detecting methods, by the setting of step 1, just
Alien frequencies detection signal effectively can be injected into faulty line using signal generation apparatus 1, pass through the setting of step 2, so that it may
So that alien frequencies detection signal effectively to be detected using signal picker 2, and the setting for passing through step 3, it is possible to utilize letter
Number reception locator 3 effectively sends out the position data of trouble point when signal picker 2 learns trouble point,
Accurately and effectively positioning action is played, this makes it possible to the trouble point of fast and accurately locating bad lines, compared to existing
It is quickly and accurately more by the way of artificial experience.
Described above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (3)
- It is 1. a kind of to 10kV distribution single-phase earth fault detecting methods, it is characterised in that：Step 1, alien frequencies detection signal is injected to singlephase earth fault circuit using signal generation apparatus (1)；Step 2, the alien frequencies detection signal and load signal of earth fault line are detected using signal picker (2), and positioning is single-phase Earth fault scene；Step 3, the measurement data detected by locator (3) reception signal collector is received using signal, and data are real-time Show, be simultaneously emitted by position data to indicate the position of trouble point, signal generation apparatus (1) used by above-mentioned steps one Including timing chip U1, the chip has discharge end and output end, and the discharge end is coupled with rheostat RP, the rheostat RP One end be coupled with after the 7th resistance R7 and be coupled to power supply, the other end is grounded after coupling the first electric capacity C1, and timing chip U1 is also With low triggering end and high-triggering end and control voltage end, the low triggering end and high-triggering end be coupled to rheostat RP with Between first electric capacity C1, diode D is coupled between the low triggering end and discharge end, the control voltage end is coupled with second It is grounded after electric capacity C2, the output end is grounded after being coupled with LED, has been also coupled to the first operational amplifier Q1, should First operational amplifier Q1 in-phase input end couples with timing chip U1 output end, and inverting input is coupled with second resistance It is grounded after R2, the output end of the first operational amplifier Q1 is coupled to second resistance R2 after being coupled with first resistor (R1), and Faulty line is further coupled to, the rheostat RP includes base (4) and the rotating disk (5) electrically connected with timing chip U1, described One end of base (4) offers swivelling chute (41), and the rotating disk (5) is embedded into swivelling chute (41), edge on the base (4) The circumferential edge for swivelling chute (41) is embedded in embedding hole (411), the swivelling chute along several resistance for supplying different resistances are placed with (41) offer on cell wall and be provided with embedding hole (411) one-to-one through hole (412), the circumferential edge of the rotating disk (5) Hemispherical contact (51), when resistance value is needed, rotating disk (5) is embedded into swivelling chute (41), hemispherical contact (51) the resistance electrical connection in through hole (412) and embedding hole (411) corresponding with the through hole (412), the rotation are passed through one of Disk (5) is also coaxially fixed with column spinner (52) backwards to one end of base (4), and the side of the column spinner (52) is further opened with anti-skidding Line.
- It is 2. according to claim 1 to 10kV distribution single-phase earth fault detecting methods, it is characterised in that：Above-mentioned steps Signal picker (2) employed in two includes transformer L, the second operational amplifier Q2 and the 3rd operational amplifier Q3, described Transformer L is hand-held transformer, the secondary end of the transformer L and the second operational amplifier Q2 in-phase input end and anti-phase Input is coupled, and the inverting input of the second operational amplifier Q2 is grounded after being also coupled to the 4th resistance R4, and described second Operational amplifier Q2 output end is coupled to the 4th resistance R4 after being coupled with 3rd resistor R3, has been also coupled to coupling after the 5th resistance R5 The 3rd operational amplifier Q3 inverting input is connected to, the inverting input of the 3rd operational amplifier Q3 has been also coupled to mutually The output end of the operational amplifier, the 3rd operational amplifier Q3 are coupled to after the 6th resistance R6 and the 3rd electric capacity C3 in parallel In-phase input end ground connection, output end, which is coupled with zigbee modules and signal and receives locator (3), to be communicated.
- It is 3. according to claim 2 to 10kV distribution single-phase earth fault detecting methods, it is characterised in that：Above-mentioned steps Three signals used, which receive locator (3), includes control CPU, liquid crystal display, 4G modules, GPRS module and zigbee modules, The control CPU couples with signal picker (2), and the 4G modules, liquid crystal display, GPRS module couple with control CPU, When signal picker (2) collects data and is input in control CPU, control CPU shows this by liquid crystal display Data, and location position data is obtained by GPRS module, then position data is sent by 4G modules.
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| CN201510805468.2A CN105486975B (en) | 2015-11-20 | 2015-11-20 | It is a kind of to 10kV distribution single-phase earth fault detecting methods |
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| CN201510805468.2A CN105486975B (en) | 2015-11-20 | 2015-11-20 | It is a kind of to 10kV distribution single-phase earth fault detecting methods |
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Families Citing this family (4)
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| CN106054030A (en) * | 2016-08-17 | 2016-10-26 | 积成电子股份有限公司 | Master station centralized type small-current grounding fault positioning method based on reactive load injection |
| CN106054031A (en) * | 2016-08-17 | 2016-10-26 | 积成电子股份有限公司 | Main station centralized low-current earth fault positioning method based on resistor load injection |
| CN113702869B (en) * | 2021-09-16 | 2022-06-17 | 浙江日新电气有限公司 | Single-phase earth fault management system and control method |
| CN114002547B (en) * | 2021-10-25 | 2024-02-02 | 国网湖北省电力有限公司恩施供电公司 | Equipment for judging secondary multipoint ground fault of transformer and analysis algorithm |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59141075A (en) * | 1983-01-17 | 1984-08-13 | Mitsubishi Electric Corp | Fault position detector for power transmission line |
| JPH06130116A (en) * | 1992-10-20 | 1994-05-13 | Matsushita Electric Ind Co Ltd | Transmission line fault searching device |
| CN201464598U (en) * | 2009-06-11 | 2010-05-12 | 程刚 | Concealed cable fault detector |
| CN201527459U (en) * | 2009-07-15 | 2010-07-14 | 覃锦衔 | Tracker of grounding point of power overhead line |
| CN201673234U (en) * | 2010-05-26 | 2010-12-15 | 西安兴汇电力科技有限公司 | Distribution line single-phase earth fault inspection device |
| CN102184625B (en) * | 2011-03-15 | 2013-12-04 | 辽宁省电力有限公司抚顺供电公司 | Third generation (3G) communication network-based transmission line fault area positioning system |
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