CN103698662A - Detection method and device for fault of direct current ice thawing overhead ground wires - Google Patents
Detection method and device for fault of direct current ice thawing overhead ground wires Download PDFInfo
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- CN103698662A CN103698662A CN201410003644.6A CN201410003644A CN103698662A CN 103698662 A CN103698662 A CN 103698662A CN 201410003644 A CN201410003644 A CN 201410003644A CN 103698662 A CN103698662 A CN 103698662A
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Abstract
The invention discloses a detection method and device for the fault of direct current ice thawing overhead ground wires, relates to the fault processing technology in the ice thawing process of a power transmission line and belongs to the field of fault monitoring of a power system. A high-voltage signal generator (1) connected with overhead ground wires M and N and a detector are arranged at a measuring point of a substation, the method comprises the steps of firstly injecting a high-voltage pulse signal between the overhead ground wires M and N and the ground by the high-voltage signal generator (1), then measuring the injection moment of the high-voltage pulse signal and the reaching moment of reflected waves of the high-voltage pulse signal at a fault point F of the overhead ground wires M and N by the detector, calculating the distance between the fault point F and the measuring point by using a single-end traveling wave fault ranging technology, thus determining the position of the fault point F. The detection method and device for the fault of the direct current ice thawing overhead ground wires solve the fault monitoring problem in the direct ice thawing process of the power transmission line, so the precision for positioning the fault point is improved, and the method and the device have the advantages of simple operation, precise positioning and the like.
Description
Technical field
DC ice melting aerial earth wire fault detection method and device.Relate to the fault handling technology in transmission line of electricity deicing processes, belong to electric power system fault monitoring field.
Background technology
In ice and snow disaster in recent years, the large portion in south transmission line of electricity has suffered huge loss.For the strong baneful influence of ice and snow disaster to transmission line of electricity of resisting, grid company has installed direct current ice melting system on the line additional, impact with reply ice and snow weather, but in the DC ice melting process to ground wire, because the insulation of ground wire is post-production, therefore in deicing processes, there will be short circuit phenomenon, even can there is metallicity short circuit phenomenon, affect the carrying out of DC ice melting work, limited the performance of direct current ice melting system function.
When there is this type of fault, if energy Fast Measurement fault distance is fixed a point to fault, just can repair in time fault, guarantee carrying out smoothly of ice-melt work.Therefore find a kind of feasible technological means with the localization of faults fast and accurately when fault occurs, to guarantee normally carrying out of DC ice melting work, particularly important.
As the mainstream technology of current power transmission line fault range finding, fault localization when row ripple principle can be applied to DC ice melting; For earth fault, can adopt the mode that Injection Signal and travelling wave ranging combine to carry out fault localization.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the problem that prior art exists, a kind of DC ice melting aerial earth wire fault detection method and device of simple to operate, the accuracy that can improve localization of fault is provided.
The technical solution adopted for the present invention to solve the technical problems is: this DC ice melting aerial earth wire fault detection method, it is characterized in that: at transformer station's measurement point, while and aerial earth wire M are set, the High-voltage Signal Generator that N is connected and sniffer, first at aerial earth wire M, between N and the earth, by High-voltage Signal Generator, inject high-voltage pulse signal, then by sniffer, measure that high-voltage pulse signal injects constantly and at aerial earth wire M, the reflection wave due in of N trouble spot F, utilize the single-ended traveling wave fault location technique computes distance of a F to measurement point that be out of order, thereby the position of localization of faults F.
The described single-ended traveling wave fault location technique computes trouble spot F that utilizes to the formula of the distance of measurement point is:
, wherein: T
for the moment of High-voltage Signal Generator output injection high-voltage pulse signal, equalling zero second is T
=0S; T
for signal arrives trouble spot F, the high-voltage pulse signal of measuring after trouble spot F reflection is at the reflection wave due in of aerial earth wire trouble spot F; V is high-voltage pulse signal velocity of propagation in the line; X is trouble spot distance; S is second.
Described detection method concrete steps are as follows:
Step 1: prepare, detect the out-of-limit or switching signal input of input signal, if so, enter step 2, if not, return to step 1;
Step 2: enabling signal acquisition circuit, gathers fault data and stamp markers;
Step 3: store the data that collect into storage unit;
Step 4: data are carried out to filtering processing, and adopt wavelet algorithm to process, obtain Wave data;
Step 5: generate Wave data and be sent to backstage and carry out manual detection;
Step 6: finish.
A device of realizing DC ice melting aerial earth wire fault detection method claimed in claim 1, is characterized in that: described sniffer is aerial earth wire malfunction detector.
Described aerial earth wire malfunction detector comprises analog signal input circuit, high-speed data acquisition unit, switching value input circuit, high precision clock and synchronizing signal receiving circuit, CPU (central processing unit), switching value output circuit, man-machine interface circuit and communication interface, simulating signal input is connected with high-speed data acquisition unit by analog signal input circuit, high-speed data acquisition unit is connected with CPU (central processing unit), and CPU (central processing unit) is connected with communication interface with switching value output circuit, man-machine interface circuit respectively.
Described high-speed data acquisition unit sampling frequency is 1MHz～5MHz.
When aerial earth wire breaks down, at transformer station's measurement point, by High-voltage Signal Generator, between aerial earth wire and ground, inject high-voltage pulse signal, by injecting the high-voltage pulse signal of different wave characteristic and amplitude, the reflection configuration time of arrival of each frequency that measurement collects, and then utilize single-ended traveling wave fault location technique computes trouble spot to the distance of measurement point.
Compared with prior art, the beneficial effect that DC ice melting aerial earth wire fault detection method of the present invention and device have is: solved the malfunction monitoring problem in power line DC ice-melting, the method can directly utilize signal generator to inject waveform characteristic and the adjustable high-voltage pulse signal of amplitude, by sniffer, in transformer station's high speed acquisition, be injected into the high-voltage pulse signal of aerial earth wire and at the waveform of aerial earth wire trouble spot reflection wave, sample frequency is adjustable between 1MHz～5MHz, has improved the accuracy of localization of fault.There is the advantages such as simple to operate, registration simultaneously.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is aerial earth wire malfunction detector schematic block circuit diagram.
Fig. 3 is detection method process flow diagram.
In figure: 1, High-voltage Signal Generator 2, aerial earth wire malfunction detector M, N: aerial earth wire F, trouble spot.
Embodiment
Fig. 1 ~ 3rd, most preferred embodiment of the present invention, is described further below in conjunction with 1 ~ 3 pair of DC ice melting aerial earth wire fault detection method of the present invention of accompanying drawing and device.
With reference to Fig. 1,3: this DC ice melting aerial earth wire fault detection method, High-voltage Signal Generator 1 and the sniffer being connected with aerial earth wire M, N is set at transformer station's measurement point simultaneously, what sniffer adopted is aerial earth wire malfunction detector 2.First between aerial earth wire M, N and the earth, by High-voltage Signal Generator 1, inject waveform characteristic and the adjustable high-voltage pulse signal of amplitude, then by aerial earth wire malfunction detector 2, measure that high-voltage pulse signals inject constantly and at the reflection wave due in of aerial earth wire M, N trouble spot F, utilize single-ended traveling wave fault location technique computes to be out of order a F to the distance of measurement point, thus the position of localization of faults F.
The described single-ended traveling wave fault location technique computes trouble spot F that utilizes to the formula of the distance of measurement point is:
, wherein: T
for the moment of High-voltage Signal Generator output injection high-voltage pulse signal, equalling zero second is T
=0S; T
for signal arrives trouble spot F, after trouble spot F reflection, the high-voltage pulse signal of measuring is at the reflection wave due in of aerial earth wire trouble spot F; V is high-voltage pulse signal velocity of propagation in the line; X is trouble spot distance; S is second.
The concrete detection steps of DC ice melting aerial earth wire fault is as follows:
Step 1: prepare, detect the out-of-limit or switching signal input of input signal, if so, enter step 2, if not, return to step 1;
Step 2: enabling signal acquisition circuit, gathers fault data and stamp markers;
Step 3: store the data that collect into storage unit;
Step 4: data are carried out to the processing such as filtering, and adopt wavelet algorithm to process, obtain Wave data;
Step 5: generate Wave data and be sent to backstage and carry out manual detection;
Step 6: finish.
Wherein: backstage is computing machine, notebook etc.
With reference to Fig. 2: this aerial earth wire malfunction detector is comprised of analog signal input circuit, high-speed data acquisition unit, switching value input circuit, high precision clock and synchronizing signal receiving circuit, CPU (central processing unit), switching value output circuit, man-machine interface circuit and communication interface, simulating signal input is connected with high-speed data acquisition unit by analog signal input circuit, high-speed data acquisition unit is connected with CPU (central processing unit), and CPU (central processing unit) is connected with communication interface with switching value output circuit, man-machine interface circuit respectively.High-speed data acquisition unit sampling frequency is 1MHz～5MHz, adjustable within the scope of this.
With reference to Fig. 1: establishing aerial earth wire M is 100km to the distance of N, before carrying out ice-melt, first at transformer station's measurement point, by High-voltage Signal Generator 1, between aerial earth wire and the earth, inject high-voltage pulse signal, the moment that aerial earth wire malfunction detector 2 is write down is now T
=0S(zero second), high-voltage pulse signal arrives after the F of aerial earth wire trouble spot, and through aerial earth wire trouble spot F reflection, then aerial earth wire malfunction detector 2 is measured this pulse signal at the reflection wave due in T of aerial earth wire trouble spot F
=300 μ s, high-voltage pulse signal velocity of propagation in the line
.By formula:
can calculate trouble spot distance is:
43.92
.
By injecting the high-voltage pulse signal of different wave and frequency, the reflection configuration time of arrival of each frequency that measurement multi collect arrives, and then utilize single-ended traveling wave fault location technique computes trouble spot to the distance of measurement point.Realization is accurately located trouble spot.
Aerial earth wire malfunction detector principle of work and the course of work are as follows:
When CPU (central processing unit) detects simulating signal input and meets the default entry condition of aerial earth wire malfunction detector or while receiving switching value input circuit signal, instruction simulation signal input circuit starts action, completes the functions such as conversion, filtering, amplification of current input signal; High-speed data acquisition unit completes realizes A/D conversion, convert original analog to computing machine accessible digital signal, in this process, high speed acquisition unit receives high precision clock circuit and produces the time signal that precision reaches μ s level, with Accurate Calibration, trigger constantly, and stamp markers to data message.The data that collect are delivered to memory cell stores, and are read, processed by CPU (central processing unit), and the data after processing are carried out to buffer memory.CPU (central processing unit) is delivered to backstage (computing machine) by communication interface by the data after processing and is carried out human assistance processing, to obtain abort situation.
Switching value output circuit is generally used for aerial earth wire malfunction detector and starts and self check abnormal alarm; Man-machine interface circuit generation device running status indicator signal, comprises that abnormal indication is normally indicated, installed to startup (triggering) indication, time synchronizing signal, the indication etc. of communicating by letter; Switching Power Supply access 110V or the input of 220V AC/DC, produce the direct supply that aerial earth wire malfunction detector internal circuit is used.
The above, be only preferred embodiment of the present invention, is not the present invention to be done to the restriction of other form, and any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solution of the present invention content that do not depart from, any simple modification, equivalent variations and the remodeling above embodiment done according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.
Claims (6)
1. DC ice melting aerial earth wire fault detection method, it is characterized in that: High-voltage Signal Generator (1) and the sniffer being connected with aerial earth wire MN is set at transformer station's measurement point simultaneously, first between aerial earth wire MN and the earth, by High-voltage Signal Generator (1), inject high-voltage pulse signal, then by sniffer, measure that high-voltage pulse signal injects constantly and at the reflection wave due in of aerial earth wire MN trouble spot F, utilize single-ended traveling wave fault location technique computes to be out of order a F to the distance of measurement point, thus the position of localization of faults F.
2. DC ice melting aerial earth wire fault detection method according to claim 1, is characterized in that: the described single-ended traveling wave fault location technique computes trouble spot F that utilizes to the formula of the distance of measurement point is:
, wherein: T
for the moment of High-voltage Signal Generator output injection high-voltage pulse signal, equalling zero second is T
=0S; T
for signal arrives trouble spot F, the high-voltage pulse signal of measuring after trouble spot F reflection is at the reflection wave due in of aerial earth wire trouble spot F; V is high-voltage pulse signal velocity of propagation in the line; X is trouble spot distance; S is second.
3. according to the arbitrary described DC ice melting aerial earth wire fault detection method of claim 1 or 2, it is characterized in that: described detection method concrete steps are as follows:
Step 1: prepare, detect the out-of-limit or switching signal input of input signal, if so, enter step 2, if not, return to step 1;
Step 2: enabling signal acquisition circuit, gathers fault data and stamp markers;
Step 3: store the data that collect into storage unit;
Step 4: data are carried out to filtering processing, and adopt wavelet algorithm to process, obtain Wave data;
Step 5: generate Wave data and be sent to backstage and carry out manual detection;
Step 6: finish.
4. a device of realizing DC ice melting aerial earth wire fault detection method claimed in claim 1, is characterized in that: described sniffer is aerial earth wire malfunction detector (2).
5. device according to claim 4, it is characterized in that: described aerial earth wire malfunction detector (2) comprises analog signal input circuit, high-speed data acquisition unit, switching value input circuit, high precision clock and synchronizing signal receiving circuit, CPU (central processing unit), switching value output circuit, man-machine interface circuit and communication interface, simulating signal input is connected with high-speed data acquisition unit by analog signal input circuit, high-speed data acquisition unit is connected with CPU (central processing unit), CPU (central processing unit) respectively with switching value output circuit, man-machine interface circuit is connected with communication interface.
6. device according to claim 5, is characterized in that: described high-speed data acquisition unit sampling frequency is 1MHz～5MHz.
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Cited By (6)
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| CN105467269A (en) * | 2015-11-23 | 2016-04-06 | 中国南方电网有限责任公司超高压输电公司贵阳局 | System and method for ground wire ice-melting fault localization of power transmission line |
| CN106019088A (en) * | 2016-05-17 | 2016-10-12 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | DC earth electrode line fault location method |
| CN106443358A (en) * | 2016-11-08 | 2017-02-22 | 三峡大学 | Aerial power distribution network traveling-wave positioning system based on signal injection device |
| CN108761257A (en) * | 2018-03-21 | 2018-11-06 | 北京蓝宇天翔环境科技有限公司 | Novel intelligent hot pipe network leakage and positioning monitoring system and method |
| CN109387743A (en) * | 2018-11-21 | 2019-02-26 | 国网辽宁省电力有限公司朝阳供电公司 | Switch and thus generate the method for single end distance measurement of traveling wave Injection Signal using neutral point |
| CN113884808A (en) * | 2021-09-28 | 2022-01-04 | 华北电力大学（保定） | Cable fault detection system and fault positioning method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105467269A (en) * | 2015-11-23 | 2016-04-06 | 中国南方电网有限责任公司超高压输电公司贵阳局 | System and method for ground wire ice-melting fault localization of power transmission line |
| CN106019088A (en) * | 2016-05-17 | 2016-10-12 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | DC earth electrode line fault location method |
| CN106019088B (en) * | 2016-05-17 | 2018-11-23 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of direct current grounding pole route distance measuring method |
| CN106443358A (en) * | 2016-11-08 | 2017-02-22 | 三峡大学 | Aerial power distribution network traveling-wave positioning system based on signal injection device |
| CN106443358B (en) * | 2016-11-08 | 2023-08-25 | 三峡大学 | Overhead power distribution network traveling wave positioning system based on signal injection device |
| CN108761257A (en) * | 2018-03-21 | 2018-11-06 | 北京蓝宇天翔环境科技有限公司 | Novel intelligent hot pipe network leakage and positioning monitoring system and method |
| CN109387743A (en) * | 2018-11-21 | 2019-02-26 | 国网辽宁省电力有限公司朝阳供电公司 | Switch and thus generate the method for single end distance measurement of traveling wave Injection Signal using neutral point |
| CN113884808A (en) * | 2021-09-28 | 2022-01-04 | 华北电力大学（保定） | Cable fault detection system and fault positioning method thereof |
| CN113884808B (en) * | 2021-09-28 | 2023-11-10 | 华北电力大学（保定） | Cable fault detection system and fault positioning method thereof |
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Application publication date: 20140402 |