CN202502190U - Fault detection and location device for frequency shift transmission line based on Labview - Google Patents
Fault detection and location device for frequency shift transmission line based on Labview Download PDFInfo
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- CN202502190U CN202502190U CN2012200880313U CN201220088031U CN202502190U CN 202502190 U CN202502190 U CN 202502190U CN 2012200880313 U CN2012200880313 U CN 2012200880313U CN 201220088031 U CN201220088031 U CN 201220088031U CN 202502190 U CN202502190 U CN 202502190U
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Abstract
The utility model discloses a Labview-based fault detecting and positioning device for frequency-shift transmission line, comprising a frequency-shift power supply, a sampling circuit, a data acquisition card, an interface circuit and an industrial personal computer, wherein the output of the frequency-shift power supply is connected with a transmission line; a voltage input and a current input in the sampling circuit are connected with the transmission line respectively; a voltage output and a current output in the sampling circuit are simultaneously connected with the data acquisition card; and the data acquisition card is connected with the industrial personal computer via a USB (universal serial bus) interface. The device is simple in equipment, convenient in use, good in human-computer interface, high in positioning accuracy, capable of effectively avoiding the interference of power-frequency induced voltage, and capable of obtaining the actual electrical parameters of the transmission line during fault detection; and development difficulty is reduced via graphical programming, and the device has very strong function expansibility.
Description
Technical field
The utility model relates to transmission line malfunction and detects and the location, especially is applicable to fault detect of long distance transmission line off-line and location, belongs to the transmission facility technical field.
Background technology
Traditional transmission line malfunction positioning function generally is to be integrated in the electrical secondary system relay protection device module; Fault Identification and location that methods such as application transient state travelling wave range finding are carried out alive circuit; For the relay protection device action provides criterion; And, can't satisfy the condition of circuit charging operation image data, and exist the probability of failure of ground short circuit or open circuit bigger for the transmission line of electricity in newly-built transmission line of electricity or the improvement project; Cause whole project of transmitting and converting electricity to lag behind and put into operation, bring great economic loss to grid company.In order under above-mentioned situation, to find the trouble spot of circuit fast, accurately, improve workmen's work efficiency, need transmission line of electricity off-line failure detector.
The principle of present most of off-line detection devices all is based on traveling wave method or impedance method.Traveling wave method is the transmission theory according to ripple, and ripple is at the transmission of electricity above-the-line promotion, when running into open circuit or short dot; Can reflect, produce standing wave on the line, carry out localization of fault through obtaining the corresponding time; The influence that the reliability of this method location and precision are not disturbed by circuit types, fault resstance and power frequency in theory; But in reality, still receive the restriction of many other engineering factors, and higher to hardware requirement, need high-speed sampling; And the extraction and the analysis of mass data proposed higher requirement, and there is bigger fault localization dead band.Impedance method is to utilize the coaptation of the voltage and current signal record and transmission line of electricity itself position of being out of order; This method realizes simple; Cost is low; In the detection line fault, can obtain the parameter of power transmission line, but the bearing accuracy of impedance method is subject to the influence of line-frequency induction undesired signal on every side; Traditional anti-interference method is the amplitude that increases the power frequency supply signal, reduces the proportion of induced voltage signal in measuring-signal, thereby improves bearing accuracy, but this improving one's methods had relatively high expectations to testing power supply.
Moreover present most of pick-up units all are to be based upon on the basis of single-chip microcomputer to realize, realize that through liquid crystal display man-machine conversation and fault show, export and record for realizing real time data, are furnished with serial line interface and computing machine and carry out communication.Because the resource-constrained of single-chip microcomputer is difficult to accomplish a series of complex calculations, man-machine interface and function expansion are restricted.
Summary of the invention
The utility model purpose is to overcome the above-mentioned deficiency that prior art exists, and a kind of fault detect of transmission line of electricity off-line and locating device based on virtual instrument, employing shift frequency method of testing is provided.
This appliance arrangement is simple, easy to use, have good man computer interface; The interference that bearing accuracy is high, can effectively avoid line-frequency induction voltage can access the actual electric parameter of power transmission line in fault detect; Through graphic programming, reduced development difficulty, have very strong function expansibility simultaneously.
What the utility model provided tests transmission line fault detection and location device based on the Labview shift frequency, comprises shift frequency power supply, sample circuit, data collecting card, interface circuit and industrial computer;
The output of shift frequency power supply links to each other with power transmission line, and input links to each other with power transmission line respectively the voltage input in the sample circuit with electric current, and output is connected data collecting card to the voltage output in the sample circuit simultaneously with electric current, and data collecting card connects industrial computer through USB interface;
Described sample circuit comprises two-way; One the tunnel is voltage sampling circuit; One the tunnel is current sampling circuit, and voltage sampling circuit is connected signal conditioning circuit and limiter protection circuit respectively successively with current sampling circuit, and the output of limiter protection circuit connects data collecting card.
Industrial computer is write DAQmx data acquisition driver in the Labview platform; Signal processing module is removed power frequency and other noise interferences through Fourier decomposition or other signal handler, and useful signal is after treatment realized fault location function through fault diagnosis and parameter calculating module.
Advantage of the utility model and good effect:
The utility model utilizes powerful graphic programming ability of Labview software and flexile data processing function; In conjunction with signal processing technologies such as Fourier decomposition; Through writing signal handler, fault diagnosis and electric parameter calculation procedure and display interface; Can effectively avoid the interference of line-frequency induction voltage; Program generation problem or need function expansion in fault detect, can access the electric parameter of power transmission line, if can conveniently realize improving in the Labview software environment.Hardware circuit is simple, easy to use, bearing accuracy is high, has good man computer interface and function expansibility.
Description of drawings
Fig. 1 is the hardware block diagram of the utility model.
Fig. 2 is the software architecture diagram of the utility model.
Fig. 3 is the fault detect mode of connection 1 of the utility model shift frequency power supply and three phase transmission line.
Fig. 4 is the fault detect mode of connection 2 of the utility model shift frequency power supply and three phase transmission line.
Fig. 5 is the utility model fault diagnosis and parameter calculating module program flow diagram.
Embodiment
Embodiment 1:
The technical scheme that the utility model adopted comprises hardware components and software section.
Hardware components comprises shift frequency power supply, sample circuit, data collecting card, interface circuit and industrial computer.
Software section comprises data acquisition driver module, signal processing module and fault diagnosis and parameter calculating module.
The output of shift frequency power supply links to each other with power transmission line; Input links to each other with power transmission line through sensor respectively with electric current in voltage input in the sample circuit; Output is connected data collecting card simultaneously with electric current in voltage output in the sample circuit, and data collecting card connects industrial computer through USB interface;
Described sample circuit comprises two-way; One the tunnel is voltage sampling circuit; One the tunnel is current sampling circuit, and voltage sampling circuit is connected signal conditioning circuit and limiter protection circuit respectively successively with current sampling circuit, and the output of limiter protection circuit connects data collecting card.
Shift frequency power supply output 40Hz or 60Hz AC signal link to each other with power transmission line; Utilize sample circuit to gather the voltage and current signal on the power transmission line; Through signal conditioning circuit and limiter protection circuit signal is sent into data collecting card, data collecting card is imported the signal that collects in the industrial computer through USB interface.
Industrial computer is write DAQmx data acquisition driver in the Labview platform; Signal processing module is removed power frequency and other noise interferences through Fourier decomposition or other signal handler, and useful signal is after treatment realized fault location function through fault diagnosis and parameter calculating module.
In order to make those skilled in the art person better understand the utility model scheme, provide a kind of concrete embodiment in conjunction with accompanying drawing:
In hardware block diagram shown in Figure 1; 700V/40Hz shift frequency power supply (1) links to each other with power transmission line (2); Voltage sampling circuit (3) links to each other with power transmission line (2) respectively with current sampling circuit (4) and samples; The output signal of voltage sampling circuit (3) or current sampling circuit (4) is sent in signal conditioning circuit (5) and the limiter protection circuit (6) in succession, and data collecting card (7) links to each other with limiter protection circuit (6), and signal is sent in the industrial computer (9) through usb circuit (8).
The physical circuit parameter that present embodiment provides is following:
Shift frequency power supply (1): this example is selected three-phase supply amplitude 700V frequency 40Hz for use
Voltage sampling circuit (3): it is 100: 1 voltage transformer (VT) that this example is selected the coil ratio for use
Current sampling circuit (4): this example is selected Hall element LEM LTS for use
Signal conditioning circuit (5) and limiter protection circuit (6): through design circuit with Control of Voltage in the range ability of (7) and guarantee precision.What data collecting card was selected for use in this example is positive and negative range, so can save (5).For (6), this example realizes limited amplitude protection with the 10V voltage stabilizing diode.
Data collecting card (7): select the USB6008 of NI company for use, range+-10V, positive and negative range.
Software architecture diagram shown in Figure 2 be with Labview as platform, utilize its function library that carries and flexile programming mode to programme, realize corresponding functions of modules, the concrete realization as follows:
Data acquisition driver module (10) is write completion with the function among the DAQmx, realizes the communication of data collecting card and industrial computer.
The function of signal processing module (11) comprises the extraction of denoising, useful signal, overcomes the interference of line-frequency induction voltage signal, is the kernel program that improves bearing accuracy.The filter module that the denoising utilization carries is realized but the extraction self-compiling program of useful signal utilizes fast Fourier to decompose.
Fault diagnosis and parameter calculating module (12) are the keys of this apparatus function.This module is utilized the valid data of signal processing module (11) output; According to the long power transmission line distributed parameter model and the corresponding mode of connection (referring to Fig. 3 or Fig. 4); In conjunction with the known power transmission line length L and the reference electric parameter of power transmission line, judge whether power transmission line breaks down, and which kind of fault takes place; As if the power transmission line non-fault, calculate the electric parameter of actual power transmission line.The program flow diagram of fault diagnosis and parameter calculating module (12) is seen Fig. 5, and detailed process is following:
1) respectively according to Fig. 3, the wiring of Fig. 4 mode of connection, establishing the valid data that obtain after module (11) is handled is u
a, u
b, u
c, i
a, i
b, i
c
2) judge the i that collects under two kinds of situation of terminal short circuit and open circuit
a, i
b, i
cWhether effective value all changes, if change simultaneously, the circuit non-fault is described then, calculates electric parameter and output according to long power transmission line distributed parameter model; If the current effective value variation is inconsistent under terminal short circuit and the open circuit situation, then according to the power transmission line canonical parameter by distributed parameter model failure judgement type and calculate fault distance.
The function that display module (13) is carried by software realizes, through software interface can be clear each item forward-sequence reactance value, positive sequence capacitance and the line fault information of demonstration power transmission line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012200880313U CN202502190U (en) | 2012-03-09 | 2012-03-09 | Fault detection and location device for frequency shift transmission line based on Labview |
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| CN2012200880313U CN202502190U (en) | 2012-03-09 | 2012-03-09 | Fault detection and location device for frequency shift transmission line based on Labview |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931658A (en) * | 2012-11-27 | 2013-02-13 | 甘肃省电力公司电力科学研究院 | Flexible alternating current transmission system (FACTS) equipment cluster control system and method |
| CN103023020A (en) * | 2012-11-27 | 2013-04-03 | 甘肃省电力公司电力科学研究院 | Facilities administration control and time schedule (FACTS) equipment cluster control system and control method thereof |
| CN113484682A (en) * | 2021-07-15 | 2021-10-08 | 保定市毅格通信自动化有限公司 | Distribution line ground fault distance measurement method based on standing wave |
| CN113552442A (en) * | 2021-07-30 | 2021-10-26 | 国网山东省电力公司淄博供电公司 | Power transmission line fault traveling wave analysis system based on LabVIEW and software development method |
-
2012
- 2012-03-09 CN CN2012200880313U patent/CN202502190U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931658A (en) * | 2012-11-27 | 2013-02-13 | 甘肃省电力公司电力科学研究院 | Flexible alternating current transmission system (FACTS) equipment cluster control system and method |
| CN103023020A (en) * | 2012-11-27 | 2013-04-03 | 甘肃省电力公司电力科学研究院 | Facilities administration control and time schedule (FACTS) equipment cluster control system and control method thereof |
| CN102931658B (en) * | 2012-11-27 | 2015-11-11 | 甘肃省电力公司电力科学研究院 | FACTS device clusters control system and control method |
| CN103023020B (en) * | 2012-11-27 | 2016-04-13 | 甘肃省电力公司电力科学研究院 | A kind of FACTS device clusters control system is with its control method |
| CN113484682A (en) * | 2021-07-15 | 2021-10-08 | 保定市毅格通信自动化有限公司 | Distribution line ground fault distance measurement method based on standing wave |
| CN113552442A (en) * | 2021-07-30 | 2021-10-26 | 国网山东省电力公司淄博供电公司 | Power transmission line fault traveling wave analysis system based on LabVIEW and software development method |
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