CN104007373A - Device and method for locating cable partial discharge signals - Google Patents
Device and method for locating cable partial discharge signals Download PDFInfo
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- CN104007373A CN104007373A CN201410233812.0A CN201410233812A CN104007373A CN 104007373 A CN104007373 A CN 104007373A CN 201410233812 A CN201410233812 A CN 201410233812A CN 104007373 A CN104007373 A CN 104007373A
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Abstract
The invention discloses a device for locating cable partial discharge signals. The device comprises an inductive probe, a data collecting unit, a signal level adjusting unit, a signal intensity judging and converting unit and a control display unit. Ultrasonic wave signals obtained by the inductive probe are converted into pulse signals in the data collecting unit and are amplified and filtered into collecting signals. After the collecting signals are adjusted by the signal level adjusting unit, whether the signal level is in a level section or not is judged through the signal intensity judging and converting unit, if yes, the collecting signals are converted into digital signals to be output, and if not, the level is output. When the control display unit obtains the level, the signal level adjusting unit is controlled to reset the collecting signal level, when the digital signals are obtained, a feature value of the digital signals is compared with a noise feature value, and unmatched frequency band signals serve as the cable partial discharge signals to be displayed or output. By means of the device for locating the cable partial discharge signals, based on an ultrasonic wave test, the cable partial discharge signals can be fast and conveniently located.
Description
Technical field
The present invention relates to power system monitoring technical field, relate in particular to a kind of device and method for positioning cable local discharge signal.
Background technology
Along with the development of urban distribution network and the needs of transformation and upgrade, the use amount of power cable line rises just year by year, and particularly high voltage power cable obtains a wide range of applications, and the amount of laying cumulative year after year.
Current, the caused defect of insulation ag(e)ing that power cable line occurs unavoidably some defects or causes because of long-time running in production, transport and installation process, after power cable line is installed and in long-play, easily there is cable local discharge phenomenon, if the long-term accumulation of this cable local discharge phenomenon, may cause serious potential safety hazard, thereby occur heavy economic losses.Therefore need accurately also to grasp in time the running status of cable line, local discharge signal is carried out to on-line monitoring or regular visit routinely, can avoid to greatest extent accident to occur.At present, lack a kind of easy to usely and test accurate equipment, under to the too large environment of cable local discharge effect of signals time, can from complicated signal, find real cable local discharge signal.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of device and method for positioning cable local discharge signal, it is based on ultrasonic investigation method, can be under to the too large environment of cable local discharge effect of signals, fast, positioning cable local discharge signal easily.
In order to solve the problems of the technologies described above, the embodiment of the present invention provides a kind of device for positioning cable local discharge signal, comprises inductive probe, data acquisition unit, signal level adjustment unit, signal intensity judgement and converting unit and control display unit; Wherein,
Described inductive probe, its output terminal is connected with the input end of described data acquisition unit, for the ultrasonic signal on induction cable circuit;
Described data acquisition unit, its output terminal is connected with the first end of described signal level adjustment unit, for the described ultrasonic signal sensing being converted to after pulse signal through amplifying and filtering processing, obtains collection signal; Wherein, described pulse signal and collection signal are simulating signal;
Described signal level adjustment unit, its second end is connected with the input end of described signal intensity judgement and converting unit, the 3rd end is connected with the first end of described control display unit, for after the level of the described collection signal obtaining is adjusted according to default level zoom factor, be adjusted signal; Wherein, described adjustment signal is simulating signal;
Described signal intensity judgement and converting unit, its output terminal is connected with the second end of described control display unit, whether the level that is used for the adjustment signal obtaining described in judging is positioned at default level interval, if so, after converting digital signal to, exports as state value the described adjustment signal obtaining; If not, do not change, only the level of the described adjustment signal obtaining is exported as state value;
Described control display unit, for obtaining state value the judgement of described output, in the time that described state value is the level of described adjustment signal, drives described signal level adjustment unit to reset described default level zoom factor; In the time that described state value is described digital signal, after being analyzed and processed according to default algorithm, described digital signal obtains the eigenwert of described digital signal, and described in judgement, whether the eigenwert that obtains all mates with arbitrary noise signal eigenwert in default noise characteristic storehouse, if not, signal under determining eigenwert in described digital signal and described arbitrary noise signal eigenwert all not being mated in frequency range is cable local discharge signal, and described cable local discharge signal is shown or export.
Wherein, in the time that the level of the described adjustment signal obtaining is less than the minimum value in described default level interval, described control display unit sends control signal and drives described signal level adjustment unit to improve described default level zoom factor; In the time that the level of the described adjustment signal obtaining is greater than the maximal value in described default level interval, described control display unit sends control signal and drives described signal level adjustment unit to dwindle described default level zoom factor.
Wherein, described data acquisition unit comprises pre-amplifying module and bandpass filtering modules block; Wherein,
Described pre-amplifying module comprises signal converter and amplifier; Wherein, the input end of described signal converter is connected with described inductive probe, and output terminal is connected with the input end of described amplifier, for converting the ultrasonic signal of described acquisition to pulse signal; The output terminal of described amplifier is connected with the input end of described bandpass filtering modules block, for described pulse signal is amplified, is amplified signal;
Described bandpass filtering modules block, its output terminal is connected with the first end of described signal level adjustment unit, for the described amplifying signal obtaining is carried out, after filtration treatment, obtaining described collection signal.
Wherein, described pre-amplifying module also comprises the high-frequency transformer being arranged between described signal converter and described amplifier, described high-frequency transformer converts differential signal to for the pulse signal that described signal converter is exported, and described differential signal is inputted to described amplifier and amplify.
Wherein, the frequency of described collection signal is between 10KHz to 300KHz.
Wherein, described signal intensity judgement and converting unit comprise the digital to analog converter of one 12 bit arithmetic precision, and the highest slewing rate of described digital to analog converter is 512KHz.
Wherein, described control display unit also comprises the 3rd end for signal output.
The embodiment of the present invention also provides a kind of method for positioning cable local discharge signal, and it realizes in aforesaid device, and described method comprises:
Ultrasonic signal on a, induction cable circuit, and the described ultrasonic signal sensing is converted to after pulse signal through amplifying and filtering processing, collection signal obtained; Wherein, described pulse signal and described collection signal are simulating signal;
B, described in after the level of the collection signal that obtains adjusts according to default level zoom factor, be adjusted signal; Wherein, described adjustment signal is simulating signal;
Whether the level of the adjustment signal obtaining described in c, judgement is positioned at default level interval, if so, after the described adjustment signal obtaining converts digital signal to, exports as state value; If not, do not change, only the level of described adjustment signal is exported as state value;
D, the state value that obtains described output judgement, in the time that described state value is the level of described adjustment signal, reset after described default level zoom factor, returns to step b; Or
In the time that described state value is described digital signal, after being analyzed and processed according to default algorithm, described digital signal obtains the eigenwert of described digital signal, and described in judgement, whether the eigenwert that obtains all mates with arbitrary noise signal eigenwert in default noise characteristic storehouse, if not, signal under determining eigenwert in described digital signal and described arbitrary noise signal eigenwert all not being mated in frequency range is cable local discharge signal, and described cable local discharge signal is shown or export.
Wherein, the concrete steps that " in the time that described state value is the level of described adjustment signal, reset described default level zoom factor " in described steps d comprise:
In the time that the level of described adjustment signal is less than the minimum value in described default level interval, improve described default level zoom factor;
In the time that the level of described adjustment signal is greater than the maximal value in described default level interval, dwindle described default level zoom factor.
Wherein, the frequency of described collection signal is between 10KHz to 300KHz.
Implement the embodiment of the present invention, there is following beneficial effect:
1, in embodiments of the present invention, owing to considering or security consideration for accuracy, equipment cabinet is sticked strip of paper used for sealing or pinning, and device is by determining cable local discharge signal based on ultrasonic investigation method, and it has high security, reliability and easy to carry;
2, in embodiments of the present invention, device realizes by controlling display unit the power that judges fast collection signal, and adjust the level panntographic system in signal level adjustment unit and carry out numerical value processing at this control display unit by controlling display unit control according to this signal power, realize and judge fast having or not of local discharge signal, it is high that it has collection signal reduction degree, can be under to the too large environment of cable local discharge effect of signals, fast, positioning cable local discharge signal easily.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, the accompanying drawing that obtains other according to these accompanying drawings still belongs to category of the present invention.
The connection diagram of the device for positioning cable local discharge signal that Fig. 1 provides for the embodiment of the present invention one;
Fig. 2 is a connection diagram of data acquisition unit in Fig. 1;
Fig. 3 is the another connection diagram of data acquisition unit in Fig. 1;
The process flow diagram of the method for positioning cable local discharge signal that Fig. 4 provides for the embodiment of the present invention two.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, in the embodiment of the present invention one, a kind of device for positioning cable local discharge signal is proposed, be applicable to equipment cabinet and sticked strip of paper used for sealing or pinning, and in electriferous state, by gather the signal discharging on cable line based on ultrasonic investigation method, this device comprises inductive probe, data acquisition unit, signal level adjustment unit, signal intensity judgement and converting unit and control display unit; Wherein,
Inductive probe, its output terminal is connected with the input end of data acquisition unit, for the ultrasonic signal on induction cable circuit;
Data acquisition unit, its output terminal is connected with the first end a1 of signal level adjustment unit, for the ultrasonic signal sensing being converted to after pulse signal through amplifying and filtering processing, obtains collection signal;
Signal level adjustment unit, its second end a2 is connected with the input end of signal intensity judgement and converting unit, the 3rd end a3 is connected with the first end b1 that controls display unit, after the level of the collection signal obtaining is adjusted according to default level zoom factor, is adjusted signal; Wherein, pulse signal, collection signal and adjustment signal are simulating signal;
Signal intensity judgement and converting unit, its output terminal is connected with the second end b2 that controls display unit, for judging that whether the level of the adjustment signal obtaining is positioned at default level interval, if so, exports as state value after the adjustment signal obtaining converts digital signal to; If not, do not change, only the level of the adjustment signal obtaining is exported as state value; This signal intensity judgement and converting unit comprise the digital to analog converter of 12 bit arithmetic precision, and the highest slewing rate of this digital to analog converter is 512KHz(hertz);
Control display unit, for obtaining state value the judgement of output, when state value is while adjusting the level of signal, drive signal level adjustment unit reset aforementioned in default level zoom factor, in the time that state value is digital signal, after being analyzed and processed according to default algorithm, digital signal obtains the eigenwert of digital signal, and whether the eigenwert of the digital signal that obtains of judgement all mates with arbitrary noise signal eigenwert in default noise characteristic storehouse, if not, determine that the signal in all not mating affiliated frequency range with arbitrary noise signal eigenwert of eigenwert in this digital signal is cable local discharge signal, and this cable local discharge signal is shown or output, in the eigenwert of the digital signal that is about to obtain and default noise characteristic storehouse, each noise signal eigenwert contrasts, if when the eigenwert obtaining is not all mated with each noise signal eigenwert, determine that the signal in all not mating affiliated frequency range with arbitrary noise signal eigenwert of eigenwert in this digital signal is cable local discharge signal, and this cable local discharge signal is shown or output.Certainly, in order further to carry out the signal in processing controls display unit or to show to control signal waveform in display unit by external equipment, this control display unit also comprises that for by the 3rd end b3 of cable local discharge signal or other signal output, the 3rd end b3 is connected with external equipment.
Should be noted that, do not have before drive signal level adjustment unit resets level zoom factor default in aforementioned controlling display unit, this default level zoom factor is 1, the level of this collection signal while not changing collection signal first passage signal level adjustment unit.
And in the time that the level of the adjustment signal obtaining is less than the minimum value in level interval default in aforementioned, control display unit send control signal drive signal level adjustment unit improve aforementioned in default level zoom factor, in the time that the level of the adjustment signal obtaining is greater than the maximal value in level interval default in aforementioned, control display unit send control signal drive signal level adjustment unit dwindle aforementioned in default level zoom factor, now, the level of collection signal also changes accordingly, obtain the unequal adjustment signal of level with the collection signal of first passage, the judgement and adjusting in entering signal intensity judgement and converting unit again of this adjustment signal, until the level of this adjustment signal is in signal intensity judgement and converting unit in default level interval, now, adjustment signal by level in level interval converts digital signal to and exports to control display unit, and contrast by digital signal is carried out to each noise signal eigenwerts of mode numerical value processing heel such as discrete Fourier transformation in control display unit, thereby determine that the signal in all not mating affiliated frequency range with arbitrary noise signal eigenwert of eigenwert in this digital signal is cable local discharge signal, and this cable local discharge signal is shown or output.
Further, as shown in Figures 2 and 3, data acquisition unit comprises pre-amplifying module and bandpass filtering modules block; Wherein,
Pre-amplifying module comprises signal converter and amplifier; Wherein, the input end of signal converter is connected with inductive probe, and output terminal is connected with the input end of amplifier, for converting the ultrasonic signal of acquisition to pulse signal; The output terminal of amplifier is connected with the input end of bandpass filtering modules block, for pulse signal is amplified, is amplified signal;
Bandpass filtering modules block, its output terminal is connected with the first end of signal level adjustment unit, after filtration treatment, obtains collection signal for the amplifying signal obtaining is carried out; This bandpass filtering modules block is selected inductance and the electric capacity composition of discrete device, is mainly to retain the signal in frequency range between 10KHz to 300KHz, and the frequency of the collection signal obtaining is between 10KHz to 300KHz.
In order to improve antijamming capability, be convenient to amplification and the filtration treatment of follow-up signal, pre-amplifying module also comprises the high-frequency transformer being arranged between signal converter and amplifier, this high-frequency transformer converts differential signal to for the pulse signal that signal converter is exported, and differential signal input amplifier is amplified.
Principle of work for the device of positioning cable local discharge signal in the embodiment of the present invention one is: first, opening device, utilize inductive probe to obtain the ultrasonic signal on cable line, converting this ultrasonic signal to pulse signal (differential signal even) amplifies after filtration treatment, the collection signal entering signal level adjustment unit obtaining, because collection signal passes through for the first time, therefore convergent-divergent level coefficient is 1, makes to collect signal level constant.
Then, signal intensity judgement and converting unit will judge the level of this collection signal, once the level of this collection signal is not in default level interval, just refuse this collection signal and convert digital signal to, and by controlling that display unit improves the convergent-divergent level coefficient (or dwindling the convergent-divergent level coefficient in signal level adjustment unit) in signal level adjustment unit thus the level of adjusting this collection signal, be adjusted signal, until the level of this adjustment signal is in default level interval, and convert the adjustment signal finally obtaining to digital signal and export to control display unit.
Afterwards, control the eigenwert that obtains digital signal after display unit is analyzed digital signal and process according to default algorithm, and each noise signal eigenwert in the eigenwert obtaining and default noise characteristic storehouse is contrasted, if when the eigenwert obtaining is not all mated with each noise signal eigenwert, signal under determining eigenwert in this digital signal and arbitrary noise signal eigenwert all not being mated in frequency range is cable local discharge signal, and by this cable local discharge signal demonstration or export to external equipment.
As shown in Figure 4, in the embodiment of the present invention two, propose a kind of method for positioning cable local discharge signal, described method comprises:
Ultrasonic signal on step S101, induction cable circuit, and the described ultrasonic signal sensing is converted to after pulse signal through amplifying and filtering processing, collection signal obtained; Wherein, described pulse signal and described collection signal are simulating signal; The frequency of described collection signal is between 10KHz to 300KHz;
Step S102, described in after the level of the collection signal that obtains adjusts according to default level zoom factor, be adjusted signal; Wherein, described adjustment signal is simulating signal;
Whether the level of the adjustment signal obtaining described in step S103, judgement is positioned at default level interval, if so, after the described adjustment signal obtaining converts digital signal to, exports as state value; If not, do not change, only the level of described adjustment signal is exported as state value;
Step S104, the state value that obtains described output judgement, in the time that described state value is the level of described adjustment signal, reset after described default level zoom factor, returns to step S102; Or
In the time that described state value is described digital signal, after being analyzed and processed according to default algorithm, described digital signal obtains the eigenwert of described digital signal, and described in judgement, whether the eigenwert that obtains all mates with arbitrary noise signal eigenwert in default noise characteristic storehouse, if not, signal under determining eigenwert in described digital signal and described arbitrary noise signal eigenwert all not being mated in frequency range is cable local discharge signal, and described cable local discharge signal is shown or export.
The concrete steps that " in the time that described state value is the level of described adjustment signal, reset described default level zoom factor " in step S104 comprise:
Step S201, in the time that the level of described adjustment signal is less than the minimum value in described default level interval, improve described default level zoom factor;
Step S202, in the time that the level of described adjustment signal is greater than the maximal value in described default level interval, dwindle described default level zoom factor.
Implement the embodiment of the present invention, there is following beneficial effect:
1, in embodiments of the present invention, owing to considering or security consideration for accuracy, equipment cabinet is sticked strip of paper used for sealing or pinning, and device is determined cable local discharge signal by the method for testing based on ultrasonic signal, and it has high security, reliability and easy to carry;
2, in embodiments of the present invention, device realizes by controlling display unit the power that judges fast collection signal, and adjust the level panntographic system in signal level adjustment unit and carry out numerical value processing at this control display unit by controlling display unit control according to this signal power, realize and judge fast having or not of local discharge signal, it is high that it has collection signal reduction degree, can be under to the too large environment of cable local discharge effect of signals, fast, positioning cable local discharge signal easily.
One of ordinary skill in the art will appreciate that all or part of step realizing in above-described embodiment method is can carry out the hardware that instruction is relevant by program to complete, described program can be stored in a computer read/write memory medium, described storage medium, as ROM/RAM, disk, CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. for a device for positioning cable local discharge signal, it is characterized in that, comprise inductive probe, data acquisition unit, signal level adjustment unit, signal intensity judgement and converting unit and control display unit; Wherein,
Described inductive probe, its output terminal is connected with the input end of described data acquisition unit, for the ultrasonic signal on induction cable circuit;
Described data acquisition unit, its output terminal is connected with the first end of described signal level adjustment unit, for the described ultrasonic signal sensing being converted to after pulse signal through amplifying and filtering processing, obtains collection signal; Wherein, described pulse signal and collection signal are simulating signal;
Described signal level adjustment unit, its second end is connected with the input end of described signal intensity judgement and converting unit, the 3rd end is connected with the first end of described control display unit, for after the level of the described collection signal obtaining is adjusted according to default level zoom factor, be adjusted signal; Wherein, described adjustment signal is simulating signal;
Described signal intensity judgement and converting unit, its output terminal is connected with the second end of described control display unit, whether the level that is used for the adjustment signal obtaining described in judging is positioned at default level interval, if so, after converting digital signal to, exports as state value the described adjustment signal obtaining; If not, do not change, only the level of the described adjustment signal obtaining is exported as state value;
Described control display unit, for obtaining state value the judgement of described output, in the time that described state value is the level of described adjustment signal, drives described signal level adjustment unit to reset described default level zoom factor; In the time that described state value is described digital signal, after being analyzed and processed according to default algorithm, described digital signal obtains the eigenwert of described digital signal, and described in judgement, whether the eigenwert that obtains all mates with arbitrary noise signal eigenwert in default noise characteristic storehouse, if not, signal under determining eigenwert in described digital signal and described arbitrary noise signal eigenwert all not being mated in frequency range is cable local discharge signal, and described cable local discharge signal is shown or export.
2. device as claimed in claim 1, it is characterized in that, in the time that the level of the described adjustment signal obtaining is less than the minimum value in described default level interval, described control display unit sends control signal and drives described signal level adjustment unit to improve described default level zoom factor; In the time that the level of the described adjustment signal obtaining is greater than the maximal value in described default level interval, described control display unit sends control signal and drives described signal level adjustment unit to dwindle described default level zoom factor.
3. device as claimed in claim 2, is characterized in that, described data acquisition unit comprises pre-amplifying module and bandpass filtering modules block; Wherein,
Described pre-amplifying module comprises signal converter and amplifier; Wherein, the input end of described signal converter is connected with described inductive probe, and output terminal is connected with the input end of described amplifier, for converting the ultrasonic signal of described acquisition to pulse signal; The output terminal of described amplifier is connected with the input end of described bandpass filtering modules block, for described pulse signal is amplified, is amplified signal;
Described bandpass filtering modules block, its output terminal is connected with the first end of described signal level adjustment unit, for the described amplifying signal obtaining is carried out, after filtration treatment, obtaining described collection signal.
4. device as claimed in claim 3, it is characterized in that, described pre-amplifying module also comprises the high-frequency transformer being arranged between described signal converter and described amplifier, described high-frequency transformer converts differential signal to for the pulse signal that described signal converter is exported, and described differential signal is inputted to described amplifier and amplify.
5. the device as described in any one in claim 1 to 4, is characterized in that, the frequency of described collection signal is between 10KHz to 300KHz.
6. device as claimed in claim 5, is characterized in that, described signal intensity judgement and converting unit comprise the digital to analog converter of one 12 bit arithmetic precision, and the highest slewing rate of described digital to analog converter is 512KHz.
7. device as claimed in claim 6, is characterized in that, described control display unit also comprises the 3rd end for signal output.
8. for a method for positioning cable local discharge signal, it is characterized in that, it realizes in the device as described in any one in claim 1 to 7, and described method comprises:
Ultrasonic signal on a, induction cable circuit, and the described ultrasonic signal sensing is converted to after pulse signal through amplifying and filtering processing, collection signal obtained; Wherein, described pulse signal and described collection signal are simulating signal;
B, described in after the level of the collection signal that obtains adjusts according to default level zoom factor, be adjusted signal; Wherein, described adjustment signal is simulating signal;
Whether the level of the adjustment signal obtaining described in c, judgement is positioned at default level interval, if so, after the described adjustment signal obtaining converts digital signal to, exports as state value; If not, do not change, only the level of described adjustment signal is exported as state value;
D, the state value that obtains described output judgement, in the time that described state value is the level of described adjustment signal, reset after described default level zoom factor, returns to step b; Or
In the time that described state value is described digital signal, after being analyzed and processed according to default algorithm, described digital signal obtains the eigenwert of described digital signal, and described in judgement, whether the eigenwert that obtains all mates with arbitrary noise signal eigenwert in default noise characteristic storehouse, if not, signal under determining eigenwert in described digital signal and described arbitrary noise signal eigenwert all not being mated in frequency range is cable local discharge signal, and described cable local discharge signal is shown or export.
9. method as claimed in claim 8, is characterized in that, the concrete steps that " in the time that described state value is the level of described adjustment signal, reset described default level zoom factor " in described steps d comprise:
In the time that the level of described adjustment signal is less than the minimum value in described default level interval, improve described default level zoom factor;
In the time that the level of described adjustment signal is greater than the maximal value in described default level interval, dwindle described default level zoom factor.
10. method as claimed in claim 9, is characterized in that, the frequency of described collection signal is between 10KHz to 300KHz.
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| CN105301454A (en) * | 2015-09-29 | 2016-02-03 | 北京环境特性研究所 | Detection method for corona discharge detection device |
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