CN114019252B - Tapping switch state evaluation method based on arc electromagnetic radiation signals - Google Patents
Tapping switch state evaluation method based on arc electromagnetic radiation signals Download PDFInfo
- Publication number
- CN114019252B CN114019252B CN202111302260.0A CN202111302260A CN114019252B CN 114019252 B CN114019252 B CN 114019252B CN 202111302260 A CN202111302260 A CN 202111302260A CN 114019252 B CN114019252 B CN 114019252B
- Authority
- CN
- China
- Prior art keywords
- arc
- electromagnetic radiation
- energy
- burning
- determining
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000005670 electromagnetic radiation Effects 0.000 title claims abstract description 100
- 238000011156 evaluation Methods 0.000 title claims abstract description 22
- 238000010079 rubber tapping Methods 0.000 title description 12
- 238000000034 method Methods 0.000 claims abstract description 40
- 238000010891 electric arc Methods 0.000 claims abstract description 15
- 230000008859 change Effects 0.000 claims description 37
- 238000001914 filtration Methods 0.000 claims description 15
- 230000035772 mutation Effects 0.000 claims description 15
- 238000012544 monitoring process Methods 0.000 claims description 13
- 238000012545 processing Methods 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 238000013480 data collection Methods 0.000 claims description 2
- 230000004044 response Effects 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000003044 adaptive effect Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 230000008033 biological extinction Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The application discloses a tap changer state evaluation method based on an arc electromagnetic radiation signal, which is characterized in that energy information in a plurality of frequency bands is obtained through electromagnetic radiation signal frequency band energy measurement of an on-load tap changer, an arc signal energy threshold of the on-load tap changer and electromagnetic radiation frequency distribution characteristics of an arc can be obtained by utilizing a self-adaptive arc signal threshold determination method, then an arc occurrence position and arc arcing intensity are determined, and arc arcing duration and energy range during each arc arcing are further determined, so that the running state of the on-load tap changer is evaluated. And finally, judging whether an arc fault occurs by using a self-adaptive on-load tap-changer state judging method, and evaluating the influence of the arc fault on the on-load tap-changer. The method and the device can improve response speed by adopting electromagnetic radiation signals, and effectively reduce false alarm rate of the electric arc through a self-adaptive electric arc signal threshold value determining method and a self-adaptive on-load tap switch state judging method.
Description
Technical Field
The application relates to the technical field of transformer equipment state evaluation, in particular to a tap switch state evaluation method based on arc electromagnetic radiation signals.
Background
The on-load tap-changer is widely applied to various power transformers, plays a key role in on-load voltage regulation, and causes serious consequences when faults occur. The on-load tap-changer is the only mechanism capable of operating in the transformer and has complex mechanical structure and electrical characteristics.
The faults of the on-load tap-changer mainly can be divided into two types of electric faults and mechanical faults, and mainly comprise sliding gears, mechanical transmission faults, contact wear and looseness, asynchronous three-phase gears, internal discharge of an oil chamber, interstage short circuit and the like. When the contact is worn and loosened, the three-phase gear is not synchronous, and the oil chamber is internally discharged, the on-load tap-changer may have arc discharge, so that the problems of partial overheating, pulse current, electromagnetic wave radiation, oil decomposition and degradation, discharge arcing, ignition and the like are caused.
The on-load tap-changer is usually placed in a transformer box body and soaked in insulating oil, and in order to monitor the running condition of the on-load tap-changer on line, state evaluation methods related to electric arcs adopted in the prior art comprise a temperature rise measurement method and an oil gas analysis method, but the two methods have the problems of long response time and high false alarm rate.
Disclosure of Invention
The application discloses a tap changer state evaluation method based on an arc electromagnetic radiation signal, which aims to solve the technical problems of long response time and high false alarm rate of an on-load tap changer state evaluation method related to an arc in the prior art.
The application discloses a tap changer state evaluation method based on arc electromagnetic radiation signals, which comprises the following steps:
setting an electromagnetic radiation receiving antenna of the on-load tap-changer, and acquiring electromagnetic radiation signals near the on-load tap-changer through the electromagnetic radiation receiving antenna;
carrying out band-pass filtering on electromagnetic radiation signals in frequency bands and obtaining energy information in each frequency band;
according to the energy information of each electromagnetic radiation receiving antenna in each frequency band, determining an arc signal energy threshold value by using a self-adaptive arc signal threshold value determining method, and determining the electromagnetic radiation frequency distribution characteristic of the arc;
judging whether arc burning occurs or not according to the arc signal energy threshold and the electromagnetic radiation frequency distribution characteristics, and if so, determining an arc occurrence position and arc burning intensity;
continuously judging the arc burning, and determining the arc burning duration and the energy range when the arc burning occurs each time;
according to the arc burning time length and the arc intense arcing degree when each arc burning occurs, the operation state of the on-load tap-changer is evaluated;
aiming at any arc burning, judging whether the arc faults occur in any arc burning or not by using a self-adaptive on-load tap-changer state judging method according to the arc burning duration and the energy range of the any arc burning;
and if the arc faults of any one of the arc burning are judged, evaluating the influence of the arc faults on the on-load tap-changer according to the arc occurrence position, the arc burning duration and the arc burning intensity of any one of the arc burning.
Optionally, the electromagnetic radiation receiving antenna is arranged on the wall of the transformer oil tank and is arranged parallel to the action main shaft of the on-load tap-changer, and the electromagnetic radiation receiving antenna is distributed close to the positions of all contacts of the on-load tap-changer.
Optionally, the step of performing band-pass filtering on the electromagnetic radiation signal and obtaining energy information in each frequency band includes:
the electromagnetic radiation signals are subjected to gain and filtering through a signal processing circuit, and the frequency bands of the electromagnetic radiation signals are divided into a plurality of groups according to the equal proportion;
and obtaining in-band signals by using high-order band-pass filtering, and calculating signal energy to obtain energy information in each frequency band.
Optionally, the determining the arc signal energy threshold by using the adaptive arc signal threshold determining method according to the energy information of each electromagnetic radiation receiving antenna in each frequency band, and determining the electromagnetic radiation frequency distribution characteristic of the arc include:
according to the energy information of each electromagnetic radiation receiving antenna in each frequency band, acquiring the average value of the historical data of the energy information in each frequency band, and setting the threshold value of the mutation range to be +/-10%;
when the newly obtained data does not exceed the mutation range threshold value, determining the newly obtained data as data in a normal state, counting energy information, and calculating a new average value;
when the newly obtained data exceeds the mutation range threshold, if the newly obtained data exceeds the mutation range threshold, judging that an arc occurs, and carrying out a recording scheme consistent with the data in a normal state on the energy information when the arc occurs to obtain an average value during the arc occurrence period; if the arc burning data exceeds the threshold value of the abrupt change range downwards, determining arc burning data from the previous data, transferring the previous data to the energy information statistics during the arc occurrence period, and processing the subsequent data according to the data in the normal state to obtain an average value in the normal state; data collection is carried out under the arc occurrence state, and the triggering conditions are opposite;
and determining an average value of the arc state and the normal state, recording a frequency band where an energy peak value is located, taking the intermediate value of the arc burning state and the normal state as an arc signal energy threshold value, recording data change trend among different frequency bands, and determining the electromagnetic radiation frequency distribution characteristic of the arc.
Optionally, before determining the average value in the arc state and the normal state, the method further includes:
and if the number of times of data transfer exceeds 10 in one hour, adjusting the threshold value of the mutation range to 20%, emptying energy information statistics, and re-determining the new arc state and the average value under the normal state.
Optionally, the determining the arc occurrence position and the arc burning intensity includes:
comparing the signals measured by the electromagnetic radiation receiving antennas near the electromagnetic radiation receiving antennas, which detect the occurrence of the electric arc, and the energy information under the lowest frequency band, determining the electromagnetic radiation receiving antenna with the most received energy as a target receiving antenna, taking the target receiving antenna as a reference, acquiring the energy intensities of all frequency bands of the target receiving antenna, and acquiring the energy intensities of all frequency bands of the two surrounding electromagnetic radiation receiving antennas of the target receiving antenna;
and determining the arc occurrence position according to the energy intensity in all frequency bands of the target receiving antenna, the energy intensity in all frequency bands of the electromagnetic radiation receiving antennas around the target receiving antenna and the energy proportion received by each electromagnetic radiation receiving antenna when the arc occurs at each contact determined by simulation, and reversely pushing out the electromagnetic radiation energy condition of the arc to determine the arc burning intensity.
Optionally, the determining, by using a self-adaptive on-load tap-changer state determining method for any arc arcing, whether the arc fault occurs in any arc arcing includes:
presetting an upper limit of arc burning duration, and determining the arc burning duration and the energy range of the arc under a normal state according to the arc burning duration and the energy range of the arc when the arc burning occurs each time;
after the number of times of arc burning exceeds 100, setting an arc burning time length change threshold and an energy range change threshold to be +/-10%, and determining electromagnetic radiation signals which do not exceed the upper limit of the arc burning time length change threshold and the energy range change threshold as normal signals when the subsequent arc is monitored, and redetermining the arc burning time length and the energy range of the arc under the normal state;
in the subsequent arc monitoring, aiming at any arc arcing, judging whether the arc arcing of any arc has arc faults or not according to the arc arcing duration and the energy range of the arc under the redetermined normal state; and when the arc burning duration exceeds the arc burning duration change threshold value or the energy range exceeds the energy range change threshold value, judging that arc faults occur in any arc burning.
Optionally, the upper limit of the arc burning duration is 20ms.
Optionally, after determining that the arc fault occurs in any one of the arc arcs, if the any one of the arc arcs is marked as a non-fault arc, a calculation flow of an arc arcing duration change threshold and an energy range change threshold in a normal state is also included; and if any arc burning is determined to be the fault burning, determining an arc burning duration change threshold value and an energy range change threshold value again.
Optionally, the method further comprises the step of sending out an alarm signal after the arc fault of any arc burning is judged.
The method obtains energy information in a plurality of frequency bands through electromagnetic radiation signal frequency band energy measurement of an on-load tap-changer, obtains an arc signal energy threshold of the on-load tap-changer and electromagnetic radiation frequency distribution characteristics of an arc by utilizing a self-adaptive arc signal threshold determining method, then determines an arc occurrence position and arc arcing intensity, further determines arc arcing duration and energy range when each arc arcing occurs, and can evaluate the running state of the on-load tap-changer according to the arc arcing duration and the arc arcing intensity when each arc arcing occurs. And finally, judging whether arc faults occur in any arc burning by using a self-adaptive on-load tap-changer state judging method, and evaluating the influence of the arc faults on the on-load tap-changer according to the arc occurrence position, the arc burning duration and the arc burning intensity of any arc burning. The method and the device can improve response speed by adopting electromagnetic radiation signals, and effectively reduce false alarm rate of the electric arc through a self-adaptive electric arc signal threshold value determining method and a self-adaptive on-load tap switch state judging method.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic workflow diagram of a tap changer state evaluation method based on an arc electromagnetic radiation signal according to an embodiment of the present application;
fig. 2 is a schematic diagram illustrating an electromagnetic radiation receiving antenna in a tap changer state evaluation method based on an arc electromagnetic radiation signal according to an embodiment of the present application;
fig. 3 is a schematic flow chart of band-pass filtering of a frequency division band in a tap changer state evaluation method based on an arc electromagnetic radiation signal according to an embodiment of the present application.
Detailed Description
In order to solve the technical problems of long response time and high false alarm rate of an on-load tap changer state evaluation method related to an electric arc in the prior art, the application discloses a tap changer state evaluation method based on an electric arc electromagnetic radiation signal through the following embodiment.
The application discloses a tap changer state evaluation method based on arc electromagnetic radiation signals, referring to a work flow diagram shown in fig. 1, specifically comprising the following steps:
step S101, setting an electromagnetic radiation receiving antenna of the on-load tap-changer, and obtaining an electromagnetic radiation signal near the on-load tap-changer through the electromagnetic radiation receiving antenna.
Furthermore, the electromagnetic radiation receiving antennas are arranged on the wall of the transformer oil tank and are arranged parallel to the action main shaft of the on-load tap-changer, and the positions of the electromagnetic radiation receiving antennas close to the contacts of the on-load tap-changer are distributed.
When the arc burns, high temperature, light emission and electromagnetic wave with rich frequency content can be generated on the discharge path. Because a large number of harmonic components exist in the voltage and current in the working environment of the converter transformer, the traditional method for monitoring the electric arc by using the voltage and current is easy to be interfered by external harmonic injection, the accuracy of electric arc detection can be influenced, and the method for monitoring the electric arc by the pressure change in the oil tank cavity caused by the decomposition and gas generation of the transformer during the high temperature and discharge generated by the electric arc arcing is long in required monitoring time and easy to be misreported because of the large specific heat capacity of the transformer. Through selecting proper antenna shape and designing proper antenna arrangement mode, the electromagnetic wave with rich frequency content emitted during arc burning can be utilized to obtain the arc burning intensity, the arc extinguishing time and the arc burning position of the tapping switch, and the quantity of antenna channels and the arc monitoring sensitivity are balanced and monitored.
Referring to fig. 2, in some embodiments of the present application, the focus arc monitoring is performed on the contact position because the arc fault that occurs in the tap switch is mainly a continuous arcing problem caused by insufficient arc extinguishing capability of the contact position when switching the tap. In order to reduce the total volume of the detection antenna and reduce the influence of a monitoring device on the on-load voltage dividing switch, a second-order hilbert antenna is selected, the material size and the base material of the antenna are adjusted to enable the receiving frequency range of the antenna to cover the range of 10MHz-50MHz in oil, a directional diagram of the antenna in a corresponding frequency range is obtained through electromagnetic simulation, according to the directional diagram and the original space distribution condition of a transformer tapping switch, when the antenna is arranged as close as possible to a tank wall nearest to the axis of the tapping switch, the monitoring coverage of the antenna is increased, the position of signal intensity-3 dB in the directional diagram of the antenna is taken as a critical angle, and a plurality of antennas are arranged along the tapping switch direction until all tapping switch contacts are partially covered, and each contact is in the-3 dB receiving range of the antenna.
Step S102, carrying out band-pass filtering on the electromagnetic radiation signal in frequency bands and acquiring energy information in each frequency band.
In some embodiments of the present application, the performing the band-pass filtering on the electromagnetic radiation signal and obtaining the energy information in each frequency band includes:
the electromagnetic radiation signals are subjected to gain and filtering through the signal processing circuit, and the frequency bands of the electromagnetic radiation signals are divided into a plurality of groups according to the equal proportion.
And obtaining in-band signals by using high-order band-pass filtering, and calculating signal energy to obtain energy information in each frequency band.
Referring to fig. 3, after electromagnetic radiation signals at corresponding spatial positions are acquired through antennas, gain and filtering are performed on the acquired signals through a signal processing circuit, frequency bands of received signals are divided into a plurality of groups according to equal proportion, and illustratively, 5 groups (10-13.8 MHz,13.8-19.0MHz,19.0-26.3MHz,26.3-36.2MHz, and 36.2-50 MHz) are divided, in-band signals are acquired through high-order band-pass filtering, and signal energy calculation is performed to acquire energy distribution under different frequency bands.
And acquiring the energy of different frequency bands after processing by using an analog-to-digital converter, and processing electromagnetic radiation signals received by each antenna according to the energy threshold value of the arc signal of each frequency band and the electromagnetic radiation frequency distribution characteristic of the arc.
Step S103, according to the energy information of each electromagnetic radiation receiving antenna in each frequency band, determining an arc signal energy threshold value by using an adaptive arc signal threshold value determining method, and determining the electromagnetic radiation frequency distribution characteristic of the arc.
In view of the fact that the arc fault judgment standards required under the conditions of different models, capacities, tapping schemes and transformers are different, the arc fault judgment standards need to be determined according to equipment, and in order to improve the universality of an evaluation method, the evaluation method provides an adaptive arc judgment standard and a tapping switch running state verification scheme. Because the monitoring scheme is the technical scheme of the on-line monitoring of the arc faults, the on-line monitoring device is installed on the transformer when equipment is manufactured or modified, the transformer is verified by manufacturers when leaving the factory, the possibility that the arc faults occur on the tapping switch in the factory test of qualified products and in the initial installation and operation is very small, the monitoring of the monitoring equipment arranged according to the scheme can cover the whole service life or maintenance period of the tapping switch, and the data recorded in the operation initial stage of the tapping switch can be used for verifying the arc judgment threshold value.
In some embodiments of the present application, the determining the arc signal energy threshold value according to the energy information of each electromagnetic radiation receiving antenna in each frequency band by using the adaptive arc signal threshold value determining method, and determining the electromagnetic radiation frequency distribution characteristic of the arc includes:
according to the energy information of each electromagnetic radiation receiving antenna in each frequency band, the average value of the historical data of the energy information in each frequency band is obtained, and the threshold value of the mutation range is set to be +/-10%.
And when the newly obtained data does not exceed the mutation range threshold value, determining the newly obtained data as data in a normal state, counting energy information, and calculating a new average value.
When the newly obtained data exceeds the mutation range threshold, if the newly obtained data exceeds the mutation range threshold, the occurrence of the arc is judged, the recording scheme consistent with the data in the normal state is carried out on the energy information when the arc occurs, and the average value during the arc occurrence period is obtained. If the threshold value of the abrupt change range is exceeded downwards, arc burning data are determined from the previous data, the previous data are transferred to the energy information statistics during the arc occurrence period, and the subsequent data are processed according to the data in the normal state, so that an average value in the normal state is obtained. And (3) collecting data under the arc occurrence state, wherein the triggering conditions are opposite.
And determining an average value of the arc state and the normal state, recording a frequency band where an energy peak value is located, taking the intermediate value of the arc burning state and the normal state as an arc signal energy threshold value, recording data change trend among different frequency bands, and determining the electromagnetic radiation frequency distribution characteristic of the arc.
Wherein before determining the average value in the arc state and the normal state, the method further comprises:
and if the number of times of data transfer exceeds 10 in one hour, adjusting the threshold value of the mutation range to 20%, emptying energy information statistics, and re-determining the new arc state and the average value under the normal state.
If the energy information of different frequency bands measured by a certain antenna exceeds the set energy threshold value of the arc signal and the energy distribution of different frequency bands is approximate to the electromagnetic radiation frequency distribution characteristic of the arc, the arc burning event is considered to occur.
And step S104, judging whether arc burning occurs according to the arc signal energy threshold and the electromagnetic radiation frequency distribution characteristic, and if so, determining the arc occurrence position and the arc burning intensity.
In some embodiments of the present application, the determining the arc occurrence location and the arc burning severity includes:
and comparing the signals measured by the electromagnetic radiation receiving antennas near the electromagnetic radiation receiving antennas, which detect the occurrence of the arc, and the energy information under the lowest frequency band, determining the electromagnetic radiation receiving antenna with the most received energy as a target receiving antenna, taking the target receiving antenna as a reference, acquiring the energy intensity of all frequency bands of the target receiving antenna, and acquiring the energy intensity of all frequency bands of the two surrounding electromagnetic radiation receiving antennas of the target receiving antenna.
And determining the arc occurrence position according to the energy intensity in all frequency bands of the target receiving antenna, the energy intensity in all frequency bands of the electromagnetic radiation receiving antennas around the target receiving antenna and the energy proportion received by each electromagnetic radiation receiving antenna when the arc occurs at each contact determined by simulation, and reversely pushing out the electromagnetic radiation energy condition of the arc to determine the arc burning intensity.
Step S105, the arc burning is continuously judged, and the arc burning duration and the energy range of each occurrence of arc burning are determined.
Specifically, through continuous signal detection, when energy signals of different frequency bands at all antennas do not meet the arc burning judgment conditions, arc extinction is considered, and the time when the arc burning judgment conditions are met for the first time and the time when the arc extinction is carried out is recorded, so that the arcing duration of the arc is obtained.
And step S106, evaluating the operation state of the on-load tap-changer according to the arc burning duration and the arc burning intensity when arc burning occurs each time.
Step S107, aiming at any arc burning, judging whether arc faults occur in any arc burning or not by utilizing a self-adaptive on-load tap-changer state judging method according to the arc burning duration and the energy range of any arc burning.
In some embodiments of the present application, the determining, by using an adaptive on-load tap-changer status determining method for any arc strike, whether an arc fault occurs in any arc strike includes:
the upper limit of the arc burning duration is preset, and the arc burning duration and the energy range of the arc under the normal state are determined according to the arc burning duration and the energy range of the arc when the arc burning occurs each time. In some embodiments of the present application, the arc burning duration upper limit is 20ms.
After the number of times of arc burning exceeds 100, setting an arc burning time length change threshold and an energy range change threshold to be +/-10% (the upper limit is +10% and the lower limit is-10%), and determining electromagnetic radiation signals which do not exceed the arc burning time length change threshold and the upper limit of the energy range change threshold as normal signals when the subsequent arc is monitored, and redetermining the arc burning time length and the energy range of the arc under the normal state.
In the subsequent arc monitoring, aiming at any arc arcing, judging whether the arc arcing of any arc has arc faults or not according to the arc arcing duration and the energy range of the arc under the redetermined normal state. And when the arc burning duration exceeds the arc burning duration change threshold value or the energy range exceeds the energy range change threshold value, judging that arc faults occur in any arc burning.
In some embodiments of the present application, after determining that the arc fault occurs in any one of the arc striking arcs, if the arc striking of any one of the arc striking arcs is determined to be a fault striking arc, the corresponding energy information is also included in the data in the normal state, and the energy information statistics is counted, so as to calculate a new average value. And re-determining the arc signal energy threshold and the electromagnetic radiation frequency distribution characteristics of the arc.
In some embodiments of the present application, after determining that the arc fault occurs in the any one arc, if the any one arc is marked as a non-fault arc, a calculation flow of an arc arcing duration change threshold and an energy range change threshold in a normal state is also included. And if any arc burning is determined to be the fault burning, determining an arc burning duration change threshold value and an energy range change threshold value again.
In some embodiments of the present application, an alarm signal is also sent out after determining that an arc fault has occurred with either arc strike.
And step S108, if the arc faults of any one of the arc burning is judged, evaluating the influence of the arc faults on the on-load tap-changer according to the arc occurrence position, the arc burning duration and the arc burning intensity of any one of the arc burning.
The embodiment of the application discloses a tap changer state evaluation method based on an arc electromagnetic radiation signal, which is characterized in that energy information in a plurality of frequency bands is obtained through electromagnetic radiation signal frequency band energy measurement of an on-load tap changer, an arc signal energy threshold of the on-load tap changer and electromagnetic radiation frequency distribution characteristics of an arc can be obtained by utilizing a self-adaptive arc signal threshold determination method, then an arc occurrence position and arc arcing intensity are determined, arc arcing duration and energy range when arc arcing occurs each time are further determined, and the running state of the on-load tap changer can be evaluated according to the arc arcing duration and the arc arcing intensity when arc arcing occurs each time. And finally, judging whether arc faults occur in any arc burning by using a self-adaptive on-load tap-changer state judging method, and evaluating the influence of the arc faults on the on-load tap-changer according to the arc occurrence position, the arc burning duration and the arc burning intensity of any arc burning. The method and the device can improve response speed by adopting electromagnetic radiation signals, and effectively reduce false alarm rate of the electric arc through a self-adaptive electric arc signal threshold value determining method and a self-adaptive on-load tap switch state judging method.
The foregoing detailed description has been provided for the purposes of illustration in connection with specific embodiments and exemplary examples, but such description is not to be construed as limiting the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications and improvements may be made to the technical solution of the present application and its embodiments without departing from the spirit and scope of the present application, and these all fall within the scope of the present application. The scope of the application is defined by the appended claims.
Claims (7)
1. A tap changer state assessment method based on arc electromagnetic radiation signals, comprising:
setting an electromagnetic radiation receiving antenna of the on-load tap-changer, and acquiring electromagnetic radiation signals near the on-load tap-changer through the electromagnetic radiation receiving antenna;
carrying out band-pass filtering on electromagnetic radiation signals in frequency bands and obtaining energy information in each frequency band;
according to the energy information of each electromagnetic radiation receiving antenna in each frequency band, determining an arc signal energy threshold value by using a self-adaptive arc signal threshold value determining method, and determining the electromagnetic radiation frequency distribution characteristic of the arc;
judging whether arc burning occurs or not according to the arc signal energy threshold and the electromagnetic radiation frequency distribution characteristics, and if so, determining an arc occurrence position and arc burning intensity;
continuously judging the arc burning, and determining the arc burning duration and the energy range when the arc burning occurs each time;
according to the arc burning duration and the arc burning intensity when each arc burning occurs, the operation state of the on-load tap-changer is evaluated;
aiming at any arc burning, judging whether the arc faults occur in any arc burning or not by using a self-adaptive on-load tap-changer state judging method according to the arc burning duration and the energy range of the any arc burning;
if the arc faults of any one of the arc burning are judged, evaluating the influence of the arc faults on the on-load tap-changer according to the arc occurrence position, the arc burning duration and the arc burning intensity of any one of the arc burning;
the electromagnetic radiation receiving antennas are arranged on the wall of the transformer oil tank and are arranged parallel to the action main shaft of the on-load tap-changer, and the positions of the electromagnetic radiation receiving antennas close to the contacts of the on-load tap-changer are distributed;
the method for determining the energy threshold of the arc signal and the electromagnetic radiation frequency distribution characteristic of the arc by utilizing the self-adaptive arc signal threshold determining method according to the energy information of each electromagnetic radiation receiving antenna in each frequency band comprises the following steps:
according to the energy information of each electromagnetic radiation receiving antenna in each frequency band, acquiring the average value of the historical data of the energy information in each frequency band, and setting the threshold value of the mutation range to be +/-10%;
when the newly obtained data does not exceed the mutation range threshold value, determining the newly obtained data as data in a normal state, counting energy information, and calculating a new average value;
when the newly obtained data exceeds the mutation range threshold, if the newly obtained data exceeds the mutation range threshold, judging that an arc occurs, and carrying out a recording scheme consistent with the data in a normal state on the energy information when the arc occurs to obtain an average value during the arc occurrence period; if the arc burning data exceeds the threshold value of the abrupt change range downwards, determining arc burning data from the previous data, transferring the previous data to the energy information statistics during the arc occurrence period, and processing the subsequent data according to the data in the normal state to obtain an average value in the normal state; data collection is carried out under the arc occurrence state, and the triggering conditions are opposite;
determining an average value of an arc state and a normal state, recording a frequency band where an energy peak value is located, taking a middle value of the arc state and the normal state as an arc signal energy threshold value, recording data change trends among different frequency bands, and determining electromagnetic radiation frequency distribution characteristics of the arc;
the method for judging whether the arc faults occur in any arc by utilizing the self-adaptive on-load tap-changer state judgment method comprises the following steps:
presetting an upper limit of arc burning duration, and determining the arc burning duration and the energy range of the arc under a normal state according to the arc burning duration and the energy range of the arc when the arc burning occurs each time;
after the number of times of arc burning exceeds 100, setting an arc burning time length change threshold and an energy range change threshold to be +/-10%, and determining electromagnetic radiation signals which do not exceed the arc burning time length change threshold and the energy range change threshold as normal signals when the subsequent arc is monitored, and redetermining the arc burning time length and the energy range of the arc under the normal state;
in the subsequent arc monitoring, aiming at any arc arcing, judging whether the arc arcing of any arc has arc faults or not according to the arc arcing duration and the energy range of the arc under the redetermined normal state; and when the arc burning duration exceeds the arc burning duration change threshold value or the energy range exceeds the energy range change threshold value, judging that arc faults occur in any arc burning.
2. The method of claim 1, wherein the step of performing band-pass filtering on the electromagnetic radiation signal and obtaining energy information in each frequency band comprises:
the electromagnetic radiation signals are subjected to gain and filtering through a signal processing circuit, and the frequency bands of the electromagnetic radiation signals are divided into a plurality of groups according to the equal proportion;
and obtaining in-band signals by using high-order band-pass filtering, and calculating signal energy to obtain energy information in each frequency band.
3. The tap changer state evaluation method of claim 1, further comprising, prior to the determining the average value in the arc state and the normal state:
and if the number of times of data transfer exceeds 10 in one hour, adjusting the threshold value of the mutation range to 20%, emptying energy information statistics, and re-determining the new arc state and the average value under the normal state.
4. The tap changer state evaluation method of claim 1, wherein the determining of the arc occurrence position and the arc burning intensity comprises:
comparing the signals measured by the electromagnetic radiation receiving antennas near the electromagnetic radiation receiving antennas, which detect the occurrence of the electric arc, and the energy information under the lowest frequency band, determining the electromagnetic radiation receiving antenna with the most received energy as a target receiving antenna, taking the target receiving antenna as a reference, acquiring the energy intensities of all frequency bands of the target receiving antenna, and acquiring the energy intensities of all frequency bands of the two surrounding electromagnetic radiation receiving antennas of the target receiving antenna;
and determining the arc occurrence position according to the energy intensity in all frequency bands of the target receiving antenna, the energy intensity in all frequency bands of the electromagnetic radiation receiving antennas around the target receiving antenna and the energy proportion received by each electromagnetic radiation receiving antenna when the arc occurs at each contact determined by simulation, and reversely pushing out the electromagnetic radiation energy condition of the arc to determine the arc burning intensity.
5. The tap changer state evaluation method of claim 1, wherein the arc burning duration upper limit is 20ms.
6. The tap changer state evaluation method of claim 1, further comprising a calculation flow of an arc burning duration change threshold and an energy range change threshold in a normal state if the arbitrary arc is marked as a non-fault arc after determining that the arbitrary arc is in arc fault; and if any arc burning is determined to be the fault burning, determining an arc burning duration change threshold value and an energy range change threshold value again.
7. The tap changer condition assessment method of claim 1, further comprising issuing an alarm signal after determining that an arc fault has occurred with either arc strike.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111302260.0A CN114019252B (en) | 2021-11-04 | 2021-11-04 | Tapping switch state evaluation method based on arc electromagnetic radiation signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111302260.0A CN114019252B (en) | 2021-11-04 | 2021-11-04 | Tapping switch state evaluation method based on arc electromagnetic radiation signals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114019252A CN114019252A (en) | 2022-02-08 |
| CN114019252B true CN114019252B (en) | 2024-04-05 |
Family
ID=80061405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111302260.0A Active CN114019252B (en) | 2021-11-04 | 2021-11-04 | Tapping switch state evaluation method based on arc electromagnetic radiation signals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114019252B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117436728B (en) * | 2023-12-20 | 2024-06-11 | 浙江万胜智能科技股份有限公司 | Control response evaluation method and system for circuit breaker |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5729145A (en) * | 1992-07-30 | 1998-03-17 | Siemens Energy & Automation, Inc. | Method and apparatus for detecting arcing in AC power systems by monitoring high frequency noise |
| CA2635862A1 (en) * | 2008-07-16 | 2010-01-16 | Daniel Dallaire | Non-intrusive electromagnetic monitoring and anti-deflagration protection method for use on medium- and high-voltage circuit breakers when energized |
| CN105425145A (en) * | 2015-11-20 | 2016-03-23 | 中国西电集团公司 | Monitoring method for electrical endurance of arc-extinguishing chamber of circuit breaker and determination method for initial time of arcing current |
| CN108181579A (en) * | 2018-01-16 | 2018-06-19 | 国网江苏省电力公司检修分公司特高压交直流运检中心 | A kind of change of current becomes tap switch vibration-electromagnetic wave joint on-line monitoring method |
| CN109752648A (en) * | 2018-12-25 | 2019-05-14 | 河北科技师范学院 | A kind of load ratio bridging switch switching arc energy on-line monitoring method and device |
| CN112183339A (en) * | 2020-09-28 | 2021-01-05 | 中车长春轨道客车股份有限公司 | Electromagnetic environment assessment method and device and server |
| CN112363021A (en) * | 2020-11-13 | 2021-02-12 | 重庆大学 | Distributed line fault detection and positioning system and method |
| CN112926644A (en) * | 2021-02-22 | 2021-06-08 | 山东大学 | Method and system for predicting residual service life of rolling bearing |
| CN113009330A (en) * | 2021-03-02 | 2021-06-22 | 国网陕西省电力公司电力科学研究院 | Vacuum circuit breaker state evaluation method and system based on radiation electromagnetic wave detection |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004056436B4 (en) * | 2004-11-19 | 2019-04-04 | Jenoptik Advanced Systems Gmbh | Method and device for detecting residual current arcs in electrical circuits |
| US7391218B2 (en) * | 2005-03-11 | 2008-06-24 | Honeywell International Inc. | Method and apparatus for generalized arc fault detection |
-
2021
- 2021-11-04 CN CN202111302260.0A patent/CN114019252B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5729145A (en) * | 1992-07-30 | 1998-03-17 | Siemens Energy & Automation, Inc. | Method and apparatus for detecting arcing in AC power systems by monitoring high frequency noise |
| CA2635862A1 (en) * | 2008-07-16 | 2010-01-16 | Daniel Dallaire | Non-intrusive electromagnetic monitoring and anti-deflagration protection method for use on medium- and high-voltage circuit breakers when energized |
| CN105425145A (en) * | 2015-11-20 | 2016-03-23 | 中国西电集团公司 | Monitoring method for electrical endurance of arc-extinguishing chamber of circuit breaker and determination method for initial time of arcing current |
| CN108181579A (en) * | 2018-01-16 | 2018-06-19 | 国网江苏省电力公司检修分公司特高压交直流运检中心 | A kind of change of current becomes tap switch vibration-electromagnetic wave joint on-line monitoring method |
| CN109752648A (en) * | 2018-12-25 | 2019-05-14 | 河北科技师范学院 | A kind of load ratio bridging switch switching arc energy on-line monitoring method and device |
| CN112183339A (en) * | 2020-09-28 | 2021-01-05 | 中车长春轨道客车股份有限公司 | Electromagnetic environment assessment method and device and server |
| CN112363021A (en) * | 2020-11-13 | 2021-02-12 | 重庆大学 | Distributed line fault detection and positioning system and method |
| CN112926644A (en) * | 2021-02-22 | 2021-06-08 | 山东大学 | Method and system for predicting residual service life of rolling bearing |
| CN113009330A (en) * | 2021-03-02 | 2021-06-22 | 国网陕西省电力公司电力科学研究院 | Vacuum circuit breaker state evaluation method and system based on radiation electromagnetic wave detection |
Non-Patent Citations (1)
| Title |
|---|
| 统一潮流控制器用500 kV油浸式串联变压器技术解析;吴鹏;陶风波;蔚超;李群;杨小平;王骏;孙磊;;电力工程技术;20180128(第01期);14-18 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114019252A (en) | 2022-02-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114019252B (en) | Tapping switch state evaluation method based on arc electromagnetic radiation signals | |
| CN201522543U (en) | Transformer winding turn-to-turn partial discharge joint detection and diagnostic platform | |
| WO2017152634A1 (en) | Method for evaluating flashover fault of ceramic column type circuit breaker of 220kv and above | |
| CN103513139A (en) | Power transformer fault intelligent diagnosis technology, method and device | |
| KR101534774B1 (en) | High voltage distributing board, low voltage distributing board, distributing board, motor contorl board having a function of diagnosing/monitoring high temperature and fire by detecting infrared and ultraviolet and transient earth voltage | |
| EP2279548B1 (en) | Arc detector and associated method for detecting undesired arcs | |
| KR102135388B1 (en) | High voltage line monitoring system of power plant | |
| WO2022105286A1 (en) | System and method for monitoring abnormal state based on progressive identification | |
| CN113009330A (en) | Vacuum circuit breaker state evaluation method and system based on radiation electromagnetic wave detection | |
| KR101535923B1 (en) | An electric distributing board with diagnosis function of electric power quality through monitoring carbonization of power cable and dischare of power apparatus connecting parts | |
| CN109638779B (en) | Self-adaptive gas protection method of on-load tap-changer for transformer | |
| Gregory et al. | More about arc-fault circuit interrupters | |
| CN111599585A (en) | Control method and system for tap switch of converter transformer | |
| KR20180050160A (en) | System and apparatus for diagnosis of oltc and diagnosis method of partial discharge | |
| Da Rocha et al. | Serial arc fault detection through wavelet transform and support vector machine | |
| CN110571070A (en) | method for evaluating breaking performance of circuit breaker | |
| Lubo et al. | Research on the application of mechanical characteristics of GIS disconnector in the equipment status evaluation | |
| CN112444577B (en) | Method and system for evaluating switching state of vacuum on-load tap-changer | |
| CN205050781U (en) | Intelligent middling pressure circuit breaker | |
| CN112067980A (en) | Arcing monitoring system and method for high-voltage circuit breaker | |
| CN112561226A (en) | Novel high-voltage switch cabinet operation state comprehensive evaluation method | |
| Cichoń et al. | Possibility of using acoustic emission method for testing load tap changers during normal operation of the transformer | |
| CN110849611A (en) | Method for on-line detection of mechanical characteristics of circuit breaker by using switch radiation field | |
| Biasse et al. | New features for MV switchgear are now available to move to condition based maintenance | |
| CN217211395U (en) | Detection apparatus for circuit breaker mechanical characteristic |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |