CN106771919B - Pulse current waveform half-peak time-width-phase spectrogram construction method and device - Google Patents
Pulse current waveform half-peak time-width-phase spectrogram construction method and device Download PDFInfo
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- CN106771919B CN106771919B CN201611198142.9A CN201611198142A CN106771919B CN 106771919 B CN106771919 B CN 106771919B CN 201611198142 A CN201611198142 A CN 201611198142A CN 106771919 B CN106771919 B CN 106771919B
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Abstract
The invention relates to a construction method and a device of partial discharge pulse current waveform half-peak time width-phase spectrograms, wherein the construction method comprises the steps of setting acquisition parameters, acquiring partial discharge pulse current waveform-time sequences based on ultra-wideband detection technology by using the acquisition parameters, extracting half-peak time width from the partial discharge pulse current waveforms, obtaining the half-peak time width-time sequences, converting the half-peak time width-time sequences into the half-peak time width-phase sequences, and displaying the half-peak time width-phase sequence spectrograms.
Description
Technical Field
The invention relates to a partial discharge information processing technology, in particular to a construction method and a device of a half-peak time-width-phase spectrogram of pulse current waveforms.
Background
When the local discharge detection is carried out on the electrical equipment insulation (oil paper insulation, gas insulation and the like), it is assumed that under an ideal noise rejection technology, when multiple local discharge sources exist (including two) based on the detection of a local discharge pulse peak value-time (phase) sequence, the local discharge data acquired by the system is a randomly aliased peak value-phase sequence (PRPD). the local discharge sources existing in the electrical equipment insulation are unknown, but under the working condition that the local discharge sources are stable, a transmission path formed by a detection system is determined.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide simple and practical pulse current waveform half-peak time-width-phase spectrogram construction methods and devices with abundant data acquisition quantity.
The purpose of the invention can be realized by the following technical scheme:
A construction method of a half-peak time-width-phase spectrogram of a local discharge pulse current waveform comprises the following steps:
setting acquisition parameters;
acquiring partial discharge pulse current waveform-time sequence based on ultra-wideband detection technology according to the acquisition parameters;
extracting a half-peak time width from the partial discharge pulse current waveform, and obtaining a half-peak time width-time sequence;
and converting the half-peak time width-time sequence into a half-peak time width-phase sequence, and displaying a spectrogram of the half-peak time width-phase sequence.
Further comprising:
and storing the partial discharge pulse current waveform-time sequence and the half-peak time width-time sequence.
The extraction of the half-peak time width from the partial discharge pulse current waveform specifically comprises:
according to a linear equation formed by two points of a% and b% at the rising edge of the pulse current waveform, calculating the corresponding time t at the apparent zero point of the pulse current waveform0：
Wherein, ta％、tb％The times corresponding to a% and b% at the rising edge, Aa％、Ab％Amplitudes corresponding to a% and b% at the rising edge, respectively，a＞b；
Calculating half-peak time width t of pulse current waveformw：tw＝t50％-t0Wherein, t50％0.5A in pulse current waveformpeakAt the corresponding 2 nd time, ApeakIs the peak value of the pulse current waveform.
The values of a and b are 90 and 10 respectively.
A local discharge pulse current waveform half-peak time-width-phase spectrogram constructing device comprises:
the setting module is used for setting acquisition parameters;
the acquisition module is used for acquiring partial discharge pulse current waveform-time sequence based on an ultra-wideband detection technology according to the acquisition parameters;
the extraction module is used for extracting half-peak time width from the partial discharge pulse current waveform and obtaining a half-peak time width-time sequence;
and the spectrogram generating and displaying module is used for converting the half-peak time width-time sequence into a half-peak time width-phase sequence and displaying the half-peak time width-phase sequence spectrogram.
Further comprising:
and the storage module is used for storing the partial discharge pulse current waveform-time sequence and the half-peak time width-time sequence.
The extraction module comprises:
a zero time calculation unit for calculating the time t corresponding to the apparent zero point of the pulse current waveform according to a linear equation formed by two points of a% and b% at the rising edge of the pulse current waveform0：
Wherein, ta％、tb％The times corresponding to a% and b% at the rising edge, Aa％、Ab％The amplitudes corresponding to a% and b% at the rising edge are respectively, and a is larger than b;
a half-peak time width calculating unit for calculating half-peak time width t of pulse current waveformw：tw＝t50％-t0Wherein, t50％0.5A in pulse current waveformpeakAt the corresponding 2 nd time, ApeakIs the peak value of the pulse current waveform.
In the zero time calculation unit, a and b take values of 90 and 10 respectively.
method for identifying discharge source based on the partial discharge pulse current waveform half-peak time width-phase spectrogram construction method comprises:
acquiring a half-peak time width-phase sequence spectrogram;
and identifying a partial discharge source according to the half-peak time width-phase sequence spectrogram, and judging whether an interference source exists or not.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention designs the construction process of the local discharge pulse current waveform half-peak time-width-phase sequence spectrogram, and is simple and practical;
(2) the half-peak time-width-phase sequence spectrogram obtained by the method contains abundant waveform information;
(3) the half-peak time-width-phase sequence spectrogram can be conveniently used for analyzing a plurality of partial discharge sources and interference pulse sources.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a schematic diagram of the structure of the apparatus of the present invention;
FIG. 3 is a schematic diagram of a pulse current waveform-time sequence collected based on ultra-wideband detection techniques in accordance with the present invention;
FIG. 4 is a schematic diagram of pulse waveform half-peak time-width extraction according to the present invention;
FIG. 5 is a schematic representation of the method of the present invention for analysis of test results.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
The invention aims to overcome the defect that the conventional PRPD spectrogram loses more information from practical application and provides methods for constructing a wide-phase spectrogram at half peak of a local discharge pulse current waveform, as shown in FIG. 1, the construction method comprises the following steps:
in step 101, setting acquisition parameters, and acquiring partial discharge pulse current waveform-time sequence based on ultra-wideband detection technology according to the set acquisition parameters;
in step 102, storing the waveform-time sequence of the collected partial discharge pulse current;
in step 104, the half-peak time-width-time sequence is converted into a half-peak time-width-phase sequence, and a spectrogram of the half-peak time-width-phase sequence phase-resolved half-peak-time (PRHPT) is displayed. The obtained half-peak time-width-phase sequence spectrogram can be compared and analyzed with the traditional PRPD spectrogram.
FIG. 3 shows embodiments of partial discharge pulse current waveform-time sequence acquisition based on ultra-wideband detection technology, in which the test sample and the detection impedance Z are measuredm end connected, detecting impedance Zm terminal is grounded, the detection impedance ZmThe response bandwidth needs to reach ns level, the time domain waveform of the local discharge pulse current is not distorted, the sampling rate of the ultra-wideband high-speed pulse recording device used in the embodiment needs to be 100MS/s or more, the analog bandwidth is 50M or more, and the stored pulse current waveform-time sequence P (t) is recordedj) The definition is as follows:
note: j-jth pulse current;
tj-the jth pulse current waveform recording time (μ s, acquisition time);
k-each pulse waveform consists of k points;
pi-the amplitude (mA/mV) corresponding to the ith point of the pulse current waveform;
Δ t (i-1) — the time corresponding to the ith point of the pulse current waveform (ns, Δ t is the sampling time interval).
In other embodiments of the invention, the impedance Z is detectedmCapacitor C capable of being connected in series with low-voltage arm of coupling capacitor2Between the ground net and the detection impedance ZmIt can also be used as a high-frequency small-current detection sensor such as Rogowski coil and non-inductive resistor.
In step 103, the extraction of the half-peak time width from the partial discharge pulse current waveform specifically includes:
according to a linear equation formed by two points of a% and b% at the rising edge of the pulse current waveform, calculating the corresponding time t at the apparent zero point of the pulse current waveform0：
Wherein, ta％、tb％Time (ns), A, corresponding to a% and b% at the rising edge, respectivelya％、Ab％The amplitudes corresponding to a% and b% at the rising edge are respectively, and a is larger than b;
calculating half-peak time width t of pulse current waveformw：tw＝t50％-t0Wherein, t50％0.5A in pulse current waveformpeakAt the corresponding 2 nd time (ns), ApeakIs the peak of the pulse current waveform, Apeak(j)＝max(P(tj) J is the jth pulse current; max is the maximum value of the pulse current waveform (mA/mV).
The values of a and b can be set according to needs, and in the embodiment, a and b are respectively 90 and 10.
In the present invention, the time-phase sequence conversion is defined as:
Apeak(φj)＝Apeak(tj)
φj＝{(tj/20)-QZ[(tj/20)]}×360
note: j-jth pulse current;
φj-the jth pulse current waveform acquires the corresponding phase (°);
QZ-integer.
As shown in fig. 2, this embodiment further provides types of local discharge pulse current waveform half-peak time-width-phase spectrogram constructing devices 2, including a setting module 201, an acquisition module 202, an extraction module 203, a spectrogram generating and displaying module 204, and a storage module 205, where the setting module 201 is configured to set acquisition parameters, the acquisition module 202 is configured to perform local discharge pulse current waveform-time sequence acquisition based on an ultra-wideband detection technique according to the set acquisition parameters, the extraction module 203 is configured to extract a half-peak time width from a local discharge pulse current waveform and obtain a half-peak time width-time sequence, the spectrogram generating and displaying module 204 is configured to convert the half-peak time width-time sequence into a half-peak time width-phase sequence and perform half-peak time width-phase spectrogram displaying, and the storage module 205 is configured to store the local discharge pulse current waveform-time sequence and the half-peak time width-time sequence.
The method for constructing the half-peak time-width-phase spectrogram of the partial discharge pulse current waveform can be used for realizing discharge source identification, identifying a partial discharge source according to a half-peak time-width-phase sequence spectrogram and judging whether an interference source exists or not, as shown in fig. 5, an analysis result of the construction method for a partial discharge test of a high-voltage hall is shown, a newly constructed PRHPT spectrogram is obtained after processing the detected pulse current waveform-time sequence according to the flow shown in fig. 1, and is compared with the traditional PRPD, whether 2 partial discharge pulse sources exist or not can not be distinguished on the amplitude distribution of the PRPD spectrogram, but 2 pulse sources obviously exist on the half-peak time-width distribution of the PRHPT, the half-peak time-width distribution interval of pulse sources is [60,80] ns, the typical pulse waveform is shown as the time-domain waveform 1, the half-peak time-width distribution interval of pulse sources is [40,60] ns, the typical pulse waveform of the typical pulse waveform is 2, and the two traditional PRPD _2 partial discharge sources are obtained by classification according to the half-peak time-width distribution interval of the PRPD shown in the PRPD.
Claims (7)
1, local discharge pulse current waveform half-peak time-width-phase spectrogram construction method, characterized by comprising:
setting acquisition parameters;
acquiring partial discharge pulse current waveform-time sequence based on ultra-wideband detection technology according to the acquisition parameters;
extracting a half-peak time width from the partial discharge pulse current waveform, and obtaining a half-peak time width-time sequence;
converting the half-peak time width-time sequence into a half-peak time width-phase sequence, and displaying a spectrogram of the half-peak time width-phase sequence;
the acquisition of the partial discharge pulse current waveform-time sequence is specifically as follows:
test sample and test impedance Zm end connected, detecting impedance Zm terminal is grounded, the detection impedance ZmThe response bandwidth needs to reach ns level, the time domain waveform of the local discharge pulse current cannot be distorted, the sampling rate of the used ultra-wideband high-speed pulse recording device needs to be 100MS/s or more, the analog bandwidth is 50M or more, and the stored pulse current waveform-time sequence P (t) is recordedj) The definition is as follows:
wherein, j is jth pulse current, tj-j-th pulse current waveform recording time, k-each pulse waveform consists of k points, pi-the amplitude, Δ t (i-1), corresponding to point i of the pulse current waveform-the time corresponding to point i of the pulse current waveform;
the extraction of the half-peak time width from the partial discharge pulse current waveform specifically comprises:
according to a% and b% at rising edge of pulse current waveformThe linear equation formed by points calculates the corresponding time t at the apparent zero point of the pulse current waveform0：
Wherein, ta％、tb％The times corresponding to a% and b% at the rising edge, Aa％、Ab％The amplitudes corresponding to a% and b% at the rising edge are respectively, and a is larger than b;
calculating half-peak time width t of pulse current waveformw：tw＝t50％-t0Wherein, t50％0.5A in pulse current waveformpeakAt the corresponding 2 nd time, ApeakIs the peak value of the pulse current waveform.
2. The method for constructing a half-peak time-width-phase spectrogram of a local discharge pulse current waveform according to claim 1, further comprising:
and storing the partial discharge pulse current waveform-time sequence and the half-peak time width-time sequence.
3. The method for constructing a local discharge pulse current waveform half-peak time-width-phase spectrogram according to claim 1, wherein a and b are 90 and 10 respectively.
4, kinds of local discharge pulse current waveform half-peak time width-phase spectrogram constructional device, characterized by comprising:
the setting module is used for setting acquisition parameters;
the acquisition module is used for acquiring partial discharge pulse current waveform-time sequence based on an ultra-wideband detection technology according to the acquisition parameters;
the extraction module is used for extracting half-peak time width from the partial discharge pulse current waveform and obtaining a half-peak time width-time sequence;
the spectrogram generating and displaying module is used for converting the half-peak time width-time sequence into a half-peak time width-phase sequence and displaying the half-peak time width-phase sequence spectrogram;
the acquisition of the partial discharge pulse current waveform-time sequence is specifically as follows:
test sample and test impedance Zm end connected, detecting impedance Zm terminal is grounded, the detection impedance ZmThe response bandwidth needs to reach ns level, the time domain waveform of the local discharge pulse current cannot be distorted, the sampling rate of the used ultra-wideband high-speed pulse recording device needs to be 100MS/s or more, the analog bandwidth is 50M or more, and the stored pulse current waveform-time sequence P (t) is recordedj) The definition is as follows:
wherein, j is jth pulse current, tj-j-th pulse current waveform recording time, k-each pulse waveform consists of k points, pi-the amplitude, Δ t (i-1), corresponding to point i of the pulse current waveform-the time corresponding to point i of the pulse current waveform;
the extraction module comprises:
a zero time calculation unit for calculating the time t corresponding to the apparent zero point of the pulse current waveform according to a linear equation formed by two points of a% and b% at the rising edge of the pulse current waveform0：
Wherein, ta％、tb％The times corresponding to a% and b% at the rising edge, Aa％、Ab％The amplitudes corresponding to a% and b% at the rising edge are respectively, and a is larger than b;
a half-peak time width calculating unit for calculating half-peak time width t of pulse current waveformw：tw＝t50％-t0Wherein, t50％0.5A in pulse current waveformpeakAt the corresponding 2 nd time, ApeakIs the peak value of the pulse current waveform.
5. The local discharge pulse current waveform half-peak time-width-phase spectrogram constructing device according to claim 4, further comprising:
and the storage module is used for storing the partial discharge pulse current waveform-time sequence and the half-peak time width-time sequence.
6. The device for constructing a half-peak time-width-phase spectrogram of a local discharge pulse current waveform according to claim 4, wherein in said zero-point time calculation unit, a and b are 90 and 10 respectively.
7, method for realizing discharge source identification based on the local discharge pulse current waveform half-peak time-width-phase spectrogram construction method of any in claims 1-3, which is characterized by comprising the following steps:
acquiring a half-peak time width-phase sequence spectrogram;
and identifying a partial discharge source according to the half-peak time width-phase sequence spectrogram, and judging whether an interference source exists or not.
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