CN102735976B - Monitoring method for state of elements of high voltage electric power equipment - Google Patents
Monitoring method for state of elements of high voltage electric power equipment Download PDFInfo
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- CN102735976B CN102735976B CN201210231830.6A CN201210231830A CN102735976B CN 102735976 B CN102735976 B CN 102735976B CN 201210231830 A CN201210231830 A CN 201210231830A CN 102735976 B CN102735976 B CN 102735976B
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Abstract
The invention provides a monitoring method for state of elements of high voltage electric power equipment. The present monitoring method for the state of the elements of the high voltage electric power equipment does not has a standard, and the absence of the standard leads to problem of false assessment to the state, wherein the standard is used for describing signals which are useful for external interference separating. The method comprises the following steps: 1. determining multiple self frequencies of the high voltage electric power equipment to be detected; 2. measuring and recording spectrum frequency of electromagnetic radiation when the electromagnetic radiation spectrum of high frequency wave band near the high voltage electric power equipment is stable; 3. comparing values of the multiple self frequencies determined in the step 1 and the frequency of the electromagnetic radiation spectrum in the step 2, and establishing information subband of the spectrum; 4. determining a standard constant value according to the spectrum value obtained from the established information subband of the spectrum; and 5. determining whether the whole technical state of the high voltage electric power equipment and the technical state of individual parts have a defect according to the standard value in the step 4. The monitoring method provided in the invention is used for monitoring the state of the elements of the high voltage electric power equipment.
Description
Technical field
The present invention relates to a kind of monitoring method of high voltage electric power equip ment element state.
Background technology
The early diagnosis (status monitoring) of high voltage electric power equip ment has special effect in the operation control of existing potential device.In exploitation when this technology, under operating voltage, in use procedure, need not cut off equipment and equipment is carried out to early diagnosis there is most important significance.
Supervision to the radiation of equipment component self electromagnetism in normal course of operation and explanation are one of state important method of monitoring equipment element.
Utilize the power equipment self electromagnetism radiation under operating voltage so that the method for monitoring status of electric power is known.Can obtain about the information that can determine the discharge process intensity producing in insulation, high voltage electric power equip ment structural detail the spectral analysis of high voltage electric power equip ment electromagnetic radiation, this method is not disturbed technological process.Discharge process (electromagnetic radiation source) and the so far contact between equipment state after deliberation very thorough.
Power equipment state monitoring method is known, if the patent No. is RU № 2311652 " power equipment state monitoring method ", and М П К G01R31/00(2006.01).Determine according to the electromagnetic radiation of this equipment for the state of power equipment under operating voltage, therefore advise that radiation frequency determined by antenna, adopt the outside vertical component of power equipment input line, with the metal shell insulation of ground connection for this reason.In the following order the status of electric power of monitoring is evaluated:
Calculate the resonant frequency of aerial radiation;
Form and the associated normal radiation frequency band of resonance frequency value;
According to watch-dog and standard device, the comparison of the integrated intensity of electromagnetic radiation in normal frequency band, concludes to the state of power equipment.
Self the electric radiation forming in power equipment is that this method is significantly determined, in order to calculate resonant frequency, adopts the parameter of outside vertical part.
The state monitoring method of high voltage electric power equip ment element is also known, if the patent No. is RU № 2368914 " monitoring method of high voltage electric power equip ment element state ", and М П К G01R31/302, (2006.01).Suggestion is analyzed the self electromagnetism radiation spectrum of converting equipment, and this analysis is:
Near high voltage electric power equip ment element, electromagnetic radiation is carried out to preliminary test research;
From electromagnetic radiation registration spectrum, mark off electromagnetic radiation part, this has produced partial discharge in built-in electrical insulation;
Then, generate electromagnetic radiation in the electric discharge of built-in electrical insulation generating portion, the numerical value of their spectra re-recorded is analyzed, formed a set of quantitative criterion, this makes the whole state of definite high voltage electric power equip ment and/or defectiveness in its individual part;
" the frequency branching section that marks off electromagnetic radiation spectrum from the electromagnetic radiation of record, electromagnetic radiation is generated by the partial discharge in built-in electrical insulation " in the conventional method; But do not have explanation to mark off the standard that meets partial discharge in built-in electrical insulation from the total spectrum of electromagnetic radiation of record.Meanwhile, near the high voltage variable electrical equipment using, electromagnetism has very large interference, disturbs from external factor and near other transformer, bus, isolating switch and transformer station's miscellaneous equipment.In order to utilize the symbol of self electromagnetism radiation as equipment component state, require to isolate useful signal from external disturbance.In existing method, do not describe the standard that clear and definite external disturbance separates useful signal, therefore in fact this can not implement, or cause the assessment of state wrong.
Summary of the invention
The object of the invention is monitoring method in order to solve existing high voltage electric power equip ment element state and do not describe clear and definite external disturbance and separate the standard of useful signal, cause the problem wrong to the assessment of state, the invention provides a kind of monitoring method of high voltage electric power equip ment element state.
The monitoring method of high voltage electric power equip ment element state, it comprises the steps:
Step 1: multiple self frequency of determining detected high voltage electric power equip ment;
Step 2: in the time that electromagnetic radiation spectrum is stablized near high frequency band high voltage electric power equip ment, measure and record the spectrum of electromagnetic radiation;
Step 3: the frequency of the electromagnetic radiation spectrum in numerical value and the step 2 of multiple self frequency of determining in comparison step one, set up the information subrane of spectrum;
Step 4: obtain spectral value in the information subrane of the spectrum of setting up, definite value settles the standard;
Step 5: according to the standard definite value described in step 4, judge whether defectiveness of the whole state of the art of high voltage electric power equip ment and the state of the art of individual part.
Multiple self frequency of the detected high voltage electric power equip ment in described step 1 comprise self frequency of whole self frequency of high voltage electric power equip ment and inner main parts size.
Described definite standard definite value comprises in the minimum value, wave band of signal in the maximal value, wave band of signal in independent frequency, wave band one or more in the function of signal amplitude value average root deviation, spectrum energy value and above-mentioned each value in signal averaging amplitude, wave band.
The task that the present invention endeavours to solve has reflected the accuracy and the reliability that improve defect in the whole state of high voltage electric power equip ment, diagnosing insulation and structural member individual component, must determine in advance multiple self frequency of equipment, if found near frequency branching section power equipment self frequency in the electromagnetic radiation of record, in this self frequency, found obvious reflected signal, can be considered as be information subrane to this frequency branching section.According to spectral amplitudes numerical value in information subrane, form the quantitative criterion about power equipment state of the art, i.e. standard definite value.Owing to having guaranteed the selection of information and interference rejection, the technique effect that method of the present invention obtains has been to improve the accuracy of the running status of monitoring high voltage electric power equip ment, for the early diagnosis of high voltage electric power equip ment provides data foundation, improve the reliability of the high voltage electric power equip ment state of the art moving under use state.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the monitoring method of high voltage electric power equip ment element state of the present invention.
Fig. 2 be near the transformer station's region inner high voltage power equipment of embodiment in embodiment one in high frequency band the schematic diagram of electromagnetic radiation spectrum.Horizontal ordinate is frequency, and ordinate is amplitude.
Embodiment
Embodiment one: below in conjunction with Fig. 1, present embodiment is described, the monitoring method of high voltage electric power equip ment element state, it comprises the steps:
Step 1: multiple self frequency of determining detected high voltage electric power equip ment;
Step 2: in the time that electromagnetic radiation spectrum is stablized near high frequency band high voltage electric power equip ment, measure and record the spectrum of electromagnetic radiation;
Step 3: the frequency of the electromagnetic radiation spectrum in numerical value and the step 2 of multiple self frequency of determining in comparison step one, set up the information subrane of spectrum;
Step 4: obtain spectral value in the information subrane of the spectrum of setting up, definite value settles the standard;
Step 5: according to the standard definite value described in step 4, judge whether defectiveness of the whole state of the art of high voltage electric power equip ment and the state of the art of individual part.
Transformer is complicated high factor circuit, and its frequecy characteristic has repeatedly resonance (self) frequency.The frequency of internal resonance oscillatory system is determined by size and the configuration of transformer device structure element, therefore, targetedly each element of equipment is determined to information frequency wave band.The energy of partial discharge carries out excitation to self high-frequency electromagnetic oscillation in transformer, in the frequency band that meets self frequency radiation they.
Therefore, the electromagnetic radiation being generated by built-in electrical insulation partial discharge, their spectrum meets spectrum line-equipment component self frequency.But not can in outside electromagnetic radiation, effectively find from all electromagnetic oscillation spectrum lines that produce in transformer.The vibration of some generations, owing to absorbing in transformer output line structure part, does not therefore occur outward at transformer.Other spectrum line can not be found under the background of senior external disturbance.Finally, the third spectrum line can be outside electromagnetic radiation register instrument be measured wave band.
Present embodiment understands a kind of monitoring method specifically, utilizes of carrying out in Russian Siberia and Far East transformer station to implement the spectrogram of obtaining in test.
Step 1: first, determine multiple self frequency of detected high voltage electric power equip ment; Described multiple self frequency is by { f
1, f
2... f
6, composition, horizontal ordinate in Fig. 2;
Step 2, in the time that near high frequency band transformer station's region inner high voltage power equipment, electromagnetic radiation spectrum is stablized, measure and record the spectrum of electromagnetic radiation;
Step 3: the frequency of the electromagnetic radiation spectrum in numerical value and the step 2 of multiple self frequency of determining in comparison step one, set up the information subrane of spectrum; In Fig. 2,, can draw to draw a conclusion:
-around self frequency f 1, what electromagnetic radiation was reflected in whole spectrum is perfectly clear;
Spectrum line in-mono-actual spectrum meets frequency f
2;
-in powerful external signal, can not mark off equipment component in frequency f
2on self electromagnetism radiation;
-at self frequency х f
4and f
6middle energy is fine sees signal;
In frequency f
5in see little signal, it is very little, can pay close attention to it.
Therefore, according to four self frequency f
1, f
2, f
4and f
6can set up the information subrane in this is given an example.The data of composite measurement instrument error and definite value miscount, and can list reserves coefficient К >1, we adopt the numerical value-frequency interval of transmission band.The transmission band of all wave bands can adopt the transmission band that equals self, finally for this example, has obtained the frequency interval of information subrane: [f
1± Δ/2], [f
2± Δ/2], [f
4± Δ/2], [f
6± Δ/2];
Step 4: obtain spectral value in the information subrane of the spectrum of setting up, definite value settles the standard;
Step 5: according to the standard definite value described in step 4, judge whether defectiveness of the whole state of the art of high voltage electric power equip ment and the state of the art of individual part.
Embodiment two: present embodiment is the further restriction of the monitoring method to the high voltage electric power equip ment element state described in embodiment one, multiple self frequency of the detected high voltage electric power equip ment in described step 1 comprise self frequency of whole self frequency of high voltage electric power equip ment and inner main parts size.
Embodiment three: present embodiment is the further restriction of the monitoring method to the high voltage electric power equip ment element state described in embodiment one, in step 2, utilize instrument, spectroanalysis instrument, wideband receiver and the oscilloscope measurement of electromagnetic radiation non-contact recording and record the spectrum of electromagnetic radiation near the high frequency band of high voltage electric power equip ment, and determine the type of the electromagnetic radiation spectrum that records.
Embodiment four: present embodiment is the further restriction of the monitoring method to the high voltage electric power equip ment element state described in embodiment one, definite standard definite value comprises in the minimum value, wave band of signal in the maximal value, wave band of signal in independent frequency, wave band one or more in the function of signal amplitude value average root deviation, spectrum energy value and above-mentioned each value in signal averaging amplitude, wave band.
In frequency, certain wave band, in the maximal value of signal, certain wave band, the function of minimum value, average amplitude value, amplitude average root deviation, spectrum energy value and above-mentioned each value of signal all belongs to a whole set of quantitative criterion separately.It when the independent and various combination of these numerical value, is all the standard of evaluating high voltage electric power equip ment state.
Embodiment five: present embodiment is the further restriction of the monitoring method to the high voltage electric power equip ment element state described in embodiment three, spectroanalysis instrument, wideband receiver and oscillograph sensitivity in step 2 are from kHz unit to MHz unit.
Spectroanalysis instrument, wideband receiver and oscillograph sensitivity are the signal that can record reliable electromagnetic radiation the wave band from kHz unit to MHz unit.
The invention belongs to the method (as power transformer) of the power equipment Element Technology state under voltage effect being carried out to remote control, can be used for setting up diagnostic message and measure synthesis.Technical result: owing to having guaranteed the selection of information and interference rejection, improved definite location precision and flaw development grade, net result is the objectivity that has improved the high voltage electric power equip ment state of the art moving under use state.High voltage electric power equip ment state monitoring method, comprises self electromagnetism radiation record and its spectral analysis, and its feature is as follows:
-by calculating or test specimen is determined self frequency that power equipment is a large amount of;
-by the electromagnetic radiation spectrum of self a large amount of frequency of power equipment relatively and record, select information frequency subrane, be not less than the stable repeating signal of 20-40 decibel with near noise exceeding.
-based on spectral amplitudes definite value in information subrane, form a set of quantitative criterion that can evaluate power equipment state of the art level.
Claims (5)
1. the monitoring method of high voltage electric power equip ment element state, is characterized in that, it comprises the steps:
Step 1: multiple self frequency of determining detected high voltage electric power equip ment;
Step 2: in the time that electromagnetic radiation spectrum is stablized near high frequency band high voltage electric power equip ment, measure and record the spectrum of electromagnetic radiation;
Step 3: the frequency of the electromagnetic radiation spectrum in numerical value and the step 2 of multiple self frequency of determining in comparison step one, set up the information subrane of spectrum;
Step 4: obtain spectral value in the information subrane of the spectrum of setting up, definite value settles the standard;
Step 5: according to the standard definite value described in step 4, judge whether defectiveness of the whole state of the art of high voltage electric power equip ment and the state of the art of individual part.
2. the monitoring method of high voltage electric power equip ment element state according to claim 1, it is characterized in that, multiple self frequency of the detected high voltage electric power equip ment in described step 1 comprise self frequency of whole self frequency of high voltage electric power equip ment and inner main parts size.
3. the monitoring method of high voltage electric power equip ment element state according to claim 1, it is characterized in that, in step 2, utilize spectroanalysis instrument, wideband receiver and oscilloscope measurement and record the spectrum of electromagnetic radiation near the high frequency band of high voltage electric power equip ment, and determine the type of the electromagnetic radiation spectrum that records.
4. the monitoring method of high voltage electric power equip ment element state according to claim 1, it is characterized in that, definite standard definite value comprises in the minimum value, wave band of signal in the maximal value, wave band of signal in independent frequency, wave band one or more in signal amplitude value average root deviation and spectrum energy value in signal averaging amplitude, wave band.
5. the monitoring method of high voltage electric power equip ment element state according to claim 3, is characterized in that, spectroanalysis instrument, wideband receiver and oscillograph sensitivity in step 2 are from kHz unit to MHz unit.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2749338C1 (en) * | 2020-10-21 | 2021-06-08 | Федеральное государственное автономное образовательное учреждение высшего образования «Дальневосточный федеральный университет» (ДВФУ) | Method for monitoring technical condition of electric power equipment |
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| JPH0738011B2 (en) * | 1988-05-16 | 1995-04-26 | 株式会社日立製作所 | Abnormality diagnosis system for high-voltage power equipment |
| JPH0664108B2 (en) * | 1989-06-02 | 1994-08-22 | 株式会社日立製作所 | Diagnostic apparatus and diagnostic method for power equipment |
| US7053625B2 (en) * | 2002-09-11 | 2006-05-30 | Electric Power Research Institute, Inc. | Method and apparatus for detecting wear in components of high voltage electrical equipment |
| JP4860795B2 (en) * | 2006-09-07 | 2012-01-25 | 三菱電機株式会社 | Power equipment |
| RU2381042C1 (en) * | 2008-11-06 | 2010-02-10 | Российская Академия сельскохозяйственных наук Государственное научное учреждение Всероссийский научно-исследовательский институт электрификации сельского хозяйства (ГНУ ВИЭСХ РОССЕЛЬХОЗАКАДЕМИИ) | Method of protecting man against influence of electromagnetic field radiated with cellular phone |
| JP5193237B2 (en) * | 2010-01-26 | 2013-05-08 | 株式会社日立製作所 | Diagnostic device for electrical equipment, diagnostic method, and diagnostic device loading body |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2749338C1 (en) * | 2020-10-21 | 2021-06-08 | Федеральное государственное автономное образовательное учреждение высшего образования «Дальневосточный федеральный университет» (ДВФУ) | Method for monitoring technical condition of electric power equipment |
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