CN105486975A - Single-phase earth fault detection method of 10kV distribution network - Google Patents
Single-phase earth fault detection method of 10kV distribution network Download PDFInfo
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- CN105486975A CN105486975A CN201510805468.2A CN201510805468A CN105486975A CN 105486975 A CN105486975 A CN 105486975A CN 201510805468 A CN201510805468 A CN 201510805468A CN 105486975 A CN105486975 A CN 105486975A
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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 single-phase earth fault detection method of the 10kV distribution network. The method comprises the steps that 1) a signal generator sends a pilot frequency detection signal to a line with a single-phase earth fault; 2) a signal collector detects the pilot frequency detection signal and a load signal of the line with the single-phase earth fault, and locates the single-phase earth fault; and 3) a signal reception locator receives measurement data detected by the signal collector, displays the data in real time, and emits position data to indicate the position of a fault point. According to the steps of method, the pilot frequency detection signal can be effectively sent to the fault line, the signal collector and the signal reception locator are used to detect the signal, the fault can be located, and the fault point can be rapidly and effectively found.
Description
Technical field
The present invention relates to a kind of electric network fault detection method, relate to a kind of to 10KV distribution single-phase earth fault detecting method in particular.
Background technology
In recent years, along with the enforcement of electric network reconstruction engineering, the change of 10kV distribution line power supply mode, enhances the dielectric level of distribution line, reduces the trip-out rate of distribution line, improves power supply reliability, decrease line loss.But take new power supply mode in actual motion, frequent generation singlephase earth fault, particularly under the inclement weather conditions such as strong wind, heavy rain, hail, snow, earth fault frequently occurs, and has had a strong impact on the safety of converting equipment and power distribution network, economical operation.After fault occurs, because line length scope is wide, adopt by rule of thumb, segmentation is push-and-pull piecemeal in the past, and the classic method such as shaft tower inspection is investigated step by step, and waste time and energy, power failure range is large, and the time is long, very difficultly quick and precisely finds trouble spot.
Summary of the invention
For prior art exist deficiency, the object of the present invention is to provide a kind of can quick and precisely find trouble spot to 10KV distribution single-phase earth fault detecting method.
For achieving the above object, the invention provides following technical scheme: a kind of to 10KV distribution single-phase earth fault detecting method,
Step one, adopts signal generation apparatus to inject alien frequencies detection signal to singlephase earth fault circuit;
Step 2, utilizes alien frequencies detection signal and the load signal of signal picker detection of ground faults circuit, location singlephase earth fault scene;
Step 3, utilizes the measurement data detected by Signal reception steady arm Received signal strength collector, and data is shown in real time, send position data with the position of indication fault point simultaneously.
As a further improvement on the present invention, the signal generation apparatus that above-mentioned steps one adopts comprises timing chip, this chip has discharge end and output terminal, described discharge end is coupled with rheostat, described rheostatic one end is coupled to power supply after being coupled with the 7th resistance, the other end couples ground connection after the first electric capacity, this timing chip also has low triggering end and high-triggering end and control voltage end, described low triggering end and high-triggering end are all coupled between rheostat and the first electric capacity, diode is coupled with between described low triggering end and discharge end, described control voltage end is coupled with ground connection after the second electric capacity, described output terminal is coupled with ground connection after light emitting diode, also be coupled with the first operational amplifier, the in-phase input end of this first operational amplifier and the output terminal of timing chip couple, inverting input is coupled with ground connection after the second resistance, the second resistance is coupled to after the output terminal of described first operational amplifier is coupled with the first resistance, and be also coupled to faulty line.
As a further improvement on the present invention, the rotating disc that described rheostat comprises base and is electrically connected with timing chip, one end of described base offers swivelling chute, described rotating disc is embedded in swivelling chute, described base supply the resistance of different resistance to embed embedding hole along the circumferential edge of swivelling chute along being placed with several, the cell wall of described swivelling chute offers and embedding hole through hole one to one, the circumferential edge of described rotating disc is provided with hemispherical contact, when needs resistance value, rotating disc is embedded in swivelling chute, hemispherical contact through one of them through hole and resistance in embedding hole corresponding to this through hole be electrically connected, one end of described rotating disc base dorsad is also coaxially fixed with column spinner, the side of described column spinner also offers anti-slip veins.
As a further improvement on the present invention, the signal picker adopted in above-mentioned steps two comprises mutual inductor, second operational amplifier and the 3rd operational amplifier, described mutual inductor is hand-held mutual inductor, the out secondary of described mutual inductor and the in-phase input end of the second operational amplifier and inverting input couple, the inverting input of described second operational amplifier is also coupled with ground connection after the 4th resistance, the 4th resistance is coupled to after the output terminal of described second operational amplifier is coupled with the 3rd resistance, the inverting input of the 3rd operational amplifier is coupled to after being also coupled with the 5th resistance, the output terminal of this operational amplifier is coupled to after the inverting input of described 3rd operational amplifier is also coupled with the 6th resistance parallel with one another and the 3rd electric capacity, the in-phase input end ground connection of described 3rd operational amplifier, output terminal is coupled with zigbee module and the communication of Signal reception steady arm.
As a further improvement on the present invention, the Signal reception steady arm that above-mentioned steps three adopts comprises control CPU, liquid crystal display, 4G module, GPRS module and zigbee module, described control CPU and signal picker couple, described 4G module, liquid crystal display, GPRS module all couple with control CPU, when signal picker collects data and is input in control CPU time, control CPU shows this data by liquid crystal display, and obtain position location data by GPRS module, then by 4G module, position data is sent.
The present invention has following beneficial effect, when line fault, by the setting of step one, just effectively can utilize signal generation apparatus, alien frequencies detection signal is injected in faulty line, this alien frequencies detection signal will circulate in faulty line, at this moment signal picker is adopted to detect alien frequencies detection signal along faulty line again, real-time for the data detected is sent to Signal reception steady arm simultaneously, real-time for these data will show by Signal reception steady arm, in time certain some left and right sides being detected, there is this alien frequencies signal side, when opposite side does not have, then determine that this point is exactly fault ground point, now the position data of this point will detect by Signal reception steady arm, then control desk is sent, this makes it possible to promptly and accurately and effectively determine the trouble spot of circuit.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of signal generation apparatus of the present invention;
Fig. 2 is the circuit diagram of signal picker of the present invention;
Fig. 3 is the module map of Signal reception steady arm of the present invention;
Fig. 4 is rheostatic one-piece construction figure in Fig. 1.
Embodiment
Shown in 4, the one of the present embodiment, to 10KV distribution single-phase earth fault detecting method, is characterized in that:
Step one, adopts signal generation apparatus 1 to inject alien frequencies detection signal to singlephase earth fault circuit;
Step 2, utilizes alien frequencies detection signal and the load signal of signal picker 2 detection of ground faults circuit, location singlephase earth fault scene;
Step 3, utilize the measurement data detected by Signal reception steady arm 3 Received signal strength collector, and data are shown in real time, send position data with the position of indication fault point simultaneously, when circuit generation earth fault, first alien frequencies detection signal is injected by signal generation apparatus 1 to faulty line, such alien frequencies detection signal will flow inside faulty line, at this moment the alien frequencies detection signal of faulty line internal circulation just can be collected by signal picker 2, in time certain some left and right sides being detected, there is this alien frequencies signal side, when opposite side does not have, then determine that this point is exactly fault ground point, now the position data of this point will detect by Signal reception steady arm 3, then control desk is sent, this makes it possible to promptly and accurately and effectively determine the trouble spot of circuit, the mode of artificial experience is adopted compared to existing technology, many fast and accurately.
As a kind of embodiment improved, the signal generation apparatus 1 that above-mentioned steps one adopts comprises timing chip U1, this chip has discharge end and output terminal, described discharge end is coupled with rheostat RP, power supply is coupled to after one end of described rheostat RP is coupled with the 7th resistance R7, the other end couples ground connection after the first electric capacity C1, this timing chip U1 also has low triggering end and high-triggering end and control voltage end, described low triggering end and high-triggering end are all coupled between rheostat RP and the first electric capacity C1, diode D is coupled with between described low triggering end and discharge end, described control voltage end is coupled with ground connection after the second electric capacity C2, described output terminal is coupled with ground connection after LED, also be coupled with the first operational amplifier Q1, the in-phase input end of this first operational amplifier Q1 and the output terminal of timing chip U1 couple, inverting input is coupled with ground connection after the second resistance R2, the second resistance R2 is coupled to after the output terminal of described first operational amplifier Q1 is coupled with the first resistance (R1), and be also coupled to faulty line, when signal generation apparatus 1 works, its internal circuit will be connected, at this moment power supply will charge to the first electric capacity C1 by the 7th resistance R7 and rheostat RP, the discharge end of timing chip U1 is closed simultaneously, output terminal exports high level, because under the effect of charging, the terminal voltage of the first electric capacity C1 will constantly raise, and this terminal voltage can constantly be input in low triggering end and high-triggering end, when the terminal voltage of the first electric capacity C1 rises to the trigger voltage of high-triggering end time, timing chip U1 will action, discharge end is opened, output terminal changes output low level into simultaneously, so now the first electric capacity C1 will be discharged to discharge end by rheostat RP, so the terminal voltage of the first electric capacity C1 will decline slowly, when terminal voltage drops to low triggering end time, timing chip U1 will action, discharge end is closed, output terminal changes output high level again into simultaneously, the terminal voltage of the first electric capacity C1 continues to rise, in time rising to high-triggering end, timing chip U1 again can action, repeat above-mentioned action, export and can become low level more again, the output terminal of such timing chip U1 will export a square wave, and this wave frequency can by the resistance of standardsizing rheostat RP, and then regulate the discharge and recharge time of the first electric capacity C1 to realize, so just effectively achieve the effect that a signal occurs, the frequency adopted in the present embodiment is low frequency, and by the setting of LED, people just can be allowed to know, and the signal of signal generation apparatus 1 exports situation, people can be adjusted it timely and effectively.
As a kind of embodiment improved, the rotating disc 5 that described rheostat RP comprises base 4 and is electrically connected with timing chip U1, one end of described base 4 offers swivelling chute 41, described rotating disc 5 is embedded in swivelling chute 41, described base 4 supply the resistance of different resistance to embed embedding hole 411 along the circumferential edge of swivelling chute 41 along being placed with several, the cell wall of described swivelling chute 41 offers and embedding hole 411 through hole 412 one to one, the circumferential edge of described rotating disc 5 is provided with hemispherical contact 51, when needs resistance value, rotating disc 5 is embedded in swivelling chute 41, the resistance of hemispherical contact 51 through one of them through hole 412 and in embedding hole 411 corresponding to this through hole 412 is electrically connected, one end of described rotating disc 5 base 4 dorsad is also coaxially fixed with column spinner 52, the side of described column spinner 52 also offers anti-slip veins, when the output frequency needing change signal generation apparatus 1, when namely changing the access resistance of rheostat RP, only need to catch column spinner 52 with hand, then column spinner 52 is turned, column spinner 52 driven rotary dish 5 is rotated in swivelling chute 41, while rotation, hemispherical contact 51 also can along with rotating together, in the process that hemispherical contact 51 rotates, will be embedded in through hole 412 one by one, when hemispherical contact 51 is embedded in a through hole 412 time, will contact by the resistance in embedding hole 411 corresponding to this through hole 412, at this moment the resistance in place in circuit is just the resistance of this resistance, when hemispherical contact 51 is embedded in another through hole 412 time, will Ohmic contact in the embedding hole 411 corresponding with this through hole 412, at this moment the resistance in place in circuit is just the resistance of this resistance, so just can be good at the effect playing a conversion resistance, and the resistance of conversion is fixing resistance, what thus would not occur adopting conventional rheostat to occur cannot by the problem of resistance conversion to a suitable resistance.
As a kind of embodiment improved, the signal picker 2 adopted in above-mentioned steps two comprises mutual inductor L, second operational amplifier Q2 and the 3rd operational amplifier Q3, described mutual inductor L is hand-held mutual inductor, the out secondary of described mutual inductor L and the in-phase input end of the second operational amplifier Q2 and inverting input couple, the inverting input of described second operational amplifier Q2 is also coupled with ground connection after the 4th resistance R4, the 4th resistance R4 is coupled to after the output terminal of described second operational amplifier Q2 is coupled with the 3rd resistance R3, the inverting input of the 3rd operational amplifier Q3 is coupled to after being also coupled with the 5th resistance R5, the output terminal of this operational amplifier is coupled to after the inverting input of described 3rd operational amplifier Q3 is also coupled with the 6th resistance R6 parallel with one another and the 3rd electric capacity C3, the in-phase input end ground connection of described 3rd operational amplifier Q3, output terminal is coupled with zigbee module and Signal reception steady arm 3 communication, at signal generation apparatus 1 by alien frequencies signal injection to faulty line, people just can hold signal picker 2 and detect along faulty line one tunnel, in the process detected, mutual inductor L is only needed to press close to faulty line, because in time having Injection Signal to flow through in faulty line, will around faulty line formation magnetic field, such mutual inductor L just effectively can induce electric current, after mutual inductor L induces electric current, just can effectively be amplified the electric current that mutual inductor L induces by the second operational amplifier Q2, simultaneously due to the present embodiment employing is low frequency signal, thus the 3rd operational amplifier Q3 is adopted to form a low-pass filter here, so just effectively can ensure that the signal be transferred in Signal reception steady arm 3 is Injection Signal, instead of other undesired signals, make the location of trouble spot more accurate, and pass through the setting of zigbee module, just effectively can realize the wireless telecommunications between Signal reception steady arm 3, one is not easy the interference being subject to faulty line, two detect process in generic failure circuit can be higher, can inconvenience very if adopt the mode of wire to connect.
As a kind of embodiment improved, the Signal reception steady arm 3 that above-mentioned steps three adopts comprises control CPU, liquid crystal display, 4G module, GPRS module and zigbee module, described control CPU and signal picker 2 couple, described 4G module, liquid crystal display, GPRS module all couples with control CPU, when signal picker 2 collects data and is input in control CPU time, control CPU shows this data by liquid crystal display, and obtain position location data by GPRS module, then by 4G module, position data is sent, after signals collecting arrives by signal picker 2, by zigbee module, signal will be sent to Signal reception steady arm 3, the zigbee module of Signal reception steady arm 3 inside will receive these signals, in appearance while alien frequencies signal can be measured, time another side can not measure, at this moment just represent and be positioned at the trouble spot on faulty line, thus at this time GPRS module will obtain the position data of this trouble spot, then sent by 4G module, , so just can effectively learn the position data of the trouble spot of faulty line, compared to the method adopting the mode of experience to carry out failure judgement point in prior art, many fast and accurately.
In sum, of the present invention to 10KV distribution single-phase earth fault detecting method, by the setting of step one, signal generation apparatus 1 just can be effectively utilized to inject alien frequencies detection signal in faulty line, by the setting of step 2, signal picker 2 just can be utilized effectively to be detected by alien frequencies detection signal, and by the setting of step 3, Signal reception steady arm 3 just can be utilized when signal picker 2 learns trouble spot, effectively the position data of trouble spot is sent out, play positioning action accurately and effectively, this makes it possible to the trouble spot of locating bad lines fast and accurately, compared to the mode of existing employing artificial experience, many quickly and accurately.
The above is only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, and all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1., to a 10KV distribution single-phase earth fault detecting method, it is characterized in that:
Step one, adopts signal generation apparatus (1) to inject alien frequencies detection signal to singlephase earth fault circuit;
Step 2, utilizes alien frequencies detection signal and the load signal of signal picker (2) detection of ground faults circuit, location singlephase earth fault scene;
Step 3, utilizes the measurement data detected by Signal reception steady arm (3) Received signal strength collector, and data is shown in real time, sends position data with the position of indication fault point simultaneously.
2. according to claim 1 to 10KV distribution single-phase earth fault detecting method, it is characterized in that: the signal generation apparatus (1) that above-mentioned steps one adopts comprises timing chip (U1), this chip has discharge end and output terminal, described discharge end is coupled with rheostat (RP), power supply is coupled to after one end of described rheostat (RP) is coupled with the 7th resistance (R7), the other end couples the first electric capacity (C1) ground connection afterwards, this timing chip (U1) also has low triggering end and high-triggering end and control voltage end, described low triggering end and high-triggering end are all coupled between rheostat (RP) and the first electric capacity (C1), diode (D) is coupled with between described low triggering end and discharge end, described control voltage end is coupled with the second electric capacity (C2) ground connection afterwards, described output terminal is coupled with light emitting diode (LED) ground connection afterwards, also be coupled with the first operational amplifier (Q1), the in-phase input end of this first operational amplifier (Q1) and the output terminal of timing chip (U1) couple, inverting input is coupled with the second resistance (R2) ground connection afterwards, the second resistance (R2) is coupled to after the output terminal of described first operational amplifier (Q1) is coupled with the first resistance (R1), and be also coupled to faulty line.
3. according to claim 2 to 10KV distribution single-phase earth fault detecting method, it is characterized in that: the rotating disc (5) that described rheostat (RP) comprises base (4) and is electrically connected with timing chip (U1), one end of described base (4) offers swivelling chute (41), described rotating disc (5) is embedded in swivelling chute (41), described base (4) supply the resistance of different resistance to embed embedding hole (411) along the circumferential edge of swivelling chute (41) along being placed with several, the cell wall of described swivelling chute (41) offers and embedding hole (411) through hole (412) one to one, the circumferential edge of described rotating disc (5) is provided with hemispherical contact (51), when needs resistance value, rotating disc (5) is embedded in swivelling chute (41), the resistance of hemispherical contact (51) through one of them through hole (412) and in embedding hole (411) corresponding to this through hole (412) is electrically connected, one end of described rotating disc (5) base (4) dorsad is also coaxially fixed with column spinner (52), the side of described column spinner (52) also offers anti-slip veins.
4. according to claim 3 to 10KV distribution single-phase earth fault detecting method, it is characterized in that: the signal picker (2) adopted in above-mentioned steps two comprises mutual inductor (L), second operational amplifier (Q2) and the 3rd operational amplifier (Q3), described mutual inductor (L) is hand-held mutual inductor, the out secondary of described mutual inductor (L) and the in-phase input end of the second operational amplifier (Q2) and inverting input couple, the inverting input of described second operational amplifier (Q2) is also coupled with the 4th resistance (R4) ground connection afterwards, the 4th resistance (R4) is coupled to after the output terminal of described second operational amplifier (Q2) is coupled with the 3rd resistance (R3), the inverting input of the 3rd operational amplifier (Q3) is coupled to after being also coupled with the 5th resistance (R5), the output terminal of this operational amplifier is coupled to after the inverting input of described 3rd operational amplifier (Q3) is also coupled with the 6th resistance (R6) parallel with one another and the 3rd electric capacity (C3), the in-phase input end ground connection of described 3rd operational amplifier (Q3), output terminal is coupled with zigbee module and Signal reception steady arm (3) communication.
5. according to claim 4 to 10KV distribution single-phase earth fault detecting method, it is characterized in that: the Signal reception steady arm (3) that above-mentioned steps three adopts comprises control CPU, liquid crystal display, 4G module, GPRS module and zigbee module, described control CPU and signal picker (2) couple, described 4G module, liquid crystal display, GPRS module all couples with control CPU, when signal picker (2) collects data and is input in control CPU time, control CPU shows this data by liquid crystal display, and obtain position location data by GPRS module, then by 4G module, position data is sent.
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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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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
| CN113702869A (en) * | 2021-09-16 | 2021-11-26 | 浙江日新电气有限公司 | Single-phase earth fault management system and control method |
| CN114002547A (en) * | 2021-10-25 | 2022-02-01 | 国网湖北省电力有限公司恩施供电公司 | Secondary multipoint earth fault judgment equipment and analysis algorithm for mutual inductor |
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| 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 |
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