CN115078914A - Reactor loop defect monitoring method and device based on bus mutual inductor - Google Patents
Reactor loop defect monitoring method and device based on bus mutual inductor Download PDFInfo
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- CN115078914A CN115078914A CN202210789097.3A CN202210789097A CN115078914A CN 115078914 A CN115078914 A CN 115078914A CN 202210789097 A CN202210789097 A CN 202210789097A CN 115078914 A CN115078914 A CN 115078914A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
- G01R19/1658—AC voltage or recurrent signals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The invention discloses a method and a device for monitoring a reactor loop defect based on a bus mutual inductor, wherein the method comprises the following steps: acquiring a secondary side electric signal of the bus mutual inductor; storing the corresponding waveform of the sudden change signal, the corresponding waveform of the preset amplitude-frequency signal and the corresponding waveform of the opening and closing signal of each path of reactor as a transient waveform; dividing the transient waveform into a plurality of groups of switching-off transient waveforms according to the switching time of each path of reactor on the same bus, wherein each group of switching-off transient waveforms corresponds to one path of reactor loop; extracting the characteristics of the waveforms in the time period containing the target frequency in each group of switching-off transient waveforms; if the deviation value of the extracted characteristic quantity and the historical characteristic quantity recorded by the historical data is larger than a preset threshold value, the reactor loop corresponding to the group of split-gate transient waveforms has defects. By adopting the invention, the detection device is arranged on the secondary side of the bus mutual inductor, so that the working condition of each reactive loop of the same bus can be detected for a long time, and the defects can be found in time.
Description
Technical Field
The invention relates to the technical field of power grid operation and maintenance, in particular to a method and a device for monitoring reactor loop defects based on a bus mutual inductor.
Background
The frequent ignition and combustion of the reactor is an important problem influencing the safe and stable operation of a power grid, the switching reactive equipment of a vacuum circuit breaker can generate restrike overvoltage and pre-breakdown overvoltage to cause insulation damage and even tripping of the equipment and damage the safe and stable operation of the power grid, at present, no on-line monitoring device exists for reactive switching of the power grid, the on-line monitoring of the reactive equipment cannot be carried out, only an off-line testing device exists, a voltage divider is arranged in an off-line method for power failure testing to obtain transient overvoltage, the switching operation is carried out after the power failure is carried out on the equipment and a contact type monitoring device is arranged, the workload is large, potential safety problems exist in field testing of personnel, the problem is that the operation condition of the equipment cannot be monitored for a long time due to the fact that only data can be obtained during the testing period, samples are limited, and the operation state after the characteristic change in the operation of the actual equipment cannot be reflected timely to meet the requirements, therefore, the application is limited, and for the defect development process of the transient device in the repeated switching process, the existing power grid does not have a device or a method for carrying out full-life-cycle observation on the reactive equipment, and the defect early warning cannot be realized.
The traditional method considers that the transient process generated in the switching process must be carried out through the voltage test of the switched part, so the prior art and the testing device adopt the mode of installing a voltage divider at the head end and the tail end of the tested reactive equipment, one-time wiring needs to be changed when power failure occurs, short circuit needs to be strictly avoided in the installation process, manual multiple switching is carried out on the equipment after the installation, the overvoltage condition of the switching process and whether the equipment is reignited are tested, testing process personnel need to operate an instrument on site, and once the transient voltage is too high and short circuit occurs, personal safety can be threatened. In addition, the current state of the equipment can only be monitored in a limited way, the long-term running state of the equipment cannot be reflected, equipment faults can be caused once a loop changes due to the defect of the equipment, and at present, a large number of running equipment of a power grid are in a non-monitoring state, so that faults or defects occur frequently.
Disclosure of Invention
The embodiment of the invention provides a method and a device for monitoring the defects of a reactor loop based on a bus mutual inductor.
In order to achieve the above object, a first aspect of the embodiments of the present application provides a method for monitoring a fault of a reactor loop based on a bus transformer, including:
acquiring a secondary side electric signal of the bus transformer;
storing waveforms corresponding to sudden change signals, waveforms corresponding to preset amplitude-frequency signals and waveforms corresponding to opening and closing signals of all paths of reactors in the secondary side electric signals as transient waveforms; the preset amplitude-frequency signal refers to an electric signal of which the frequency and the amplitude exceed a preset threshold value simultaneously;
dividing the transient waveform into a plurality of groups of switching-off transient waveforms according to the switching time of each path of reactor on the same bus, wherein each group of switching-off transient waveforms corresponds to one path of reactor loop; when each path of reactor is switched, the secondary side electric signal can generate oscillation with a certain frequency;
extracting the characteristics of the waveforms in the time period containing the target frequency in each group of switching-off transient waveforms;
if the deviation value of the extracted characteristic quantity and the historical characteristic quantity recorded by the historical data is larger than a preset threshold value, the reactor loop corresponding to the group of split-gate transient waveforms has defects.
In a possible implementation manner of the first aspect, the extracting features of waveforms in a time period in which each group of switching-off transient waveforms includes a target frequency specifically includes:
if the waveform frequency of the group of the split gate transient waveforms in a time period is equal to the target frequency, feature extraction is carried out on the waveforms in the time period, and the extracted feature quantity comprises oscillation amplitude, oscillation frequency, attenuation time constant and whether amplitude catastrophe points exist.
In a possible implementation manner of the first aspect, the extracting a deviation value between the extracted feature quantity and a historical feature quantity recorded in historical data is greater than a preset threshold, and the extracting includes:
the deviation value of the dispersion of the oscillation amplitude exceeds a preset threshold, or,
the deviation value of the oscillation frequency exceeds a preset threshold, or,
the deviation value of the decay time constant exceeds a preset threshold, or,
the deviation value of the oscillating voltage waveform exceeds a preset threshold.
In a possible implementation manner of the first aspect, if the deviation value between the extracted feature quantity and the historical feature quantity recorded in the historical data is greater than a preset threshold, the reactor loop corresponding to the set of split-gate transient waveforms has a defect, specifically including:
when the deviation value of the decay time constant is larger than a preset threshold value, the equipment parameters of the reactor loop are changed disadvantageously.
In a possible implementation manner of the first aspect, if the deviation value between the extracted feature quantity and the historical feature quantity recorded in the historical data is greater than a preset threshold, the reactor loop corresponding to the set of split-gate transient waveforms has a defect, specifically including:
when the deviation value of the oscillation voltage waveform is larger than a preset threshold value, the reactor loop has the defect of insulation breakdown.
A second aspect of the embodiments of the present application provides a reactor loop defect monitoring device based on a bus transformer, which is applied to a secondary side of the bus transformer, and includes:
the signal acquisition module is used for acquiring a secondary side electric signal of the bus mutual inductor;
the waveform storage module is used for storing a corresponding waveform of a sudden change signal, a corresponding waveform of a preset amplitude-frequency signal and a corresponding waveform of a switching-on/off signal of each path of reactor as a transient waveform; the preset amplitude-frequency signal refers to an electric signal of which the frequency and the amplitude exceed a preset threshold value simultaneously;
the dividing module is used for dividing the transient waveform into a plurality of groups of switching-off transient waveforms according to the switching time of each path of reactor on the same bus, wherein each group of switching-off transient waveforms corresponds to one path of reactor loop;
the characteristic extraction module is used for extracting the characteristics of the waveforms in the time period containing the target frequency in each group of switching-off transient waveforms;
and the defect analysis module is used for judging that the reactor loop corresponding to the set of brake transient waveforms has defects if the deviation value of the extracted characteristic quantity and the historical characteristic quantity recorded by the historical data is greater than a preset threshold value.
In a possible implementation manner of the second aspect, if a waveform frequency of the group of split-gate transient waveforms in a time period is equal to a target frequency, feature extraction is performed on the waveforms in the time period, and the extracted feature quantities include an oscillation amplitude, an oscillation frequency, a decay time constant, and whether an amplitude discontinuity exists.
In a possible implementation manner of the second aspect, the feature extraction module is specifically configured to:
if the waveform frequency of the group of switching transient state waveforms in a time period is equal to the target frequency, feature extraction is carried out on the waveforms in the time period, and the extracted feature quantity comprises oscillation amplitude, oscillation frequency, attenuation time constant and whether amplitude catastrophe points exist.
In a possible implementation manner of the second aspect, the extracting a deviation value between the extracted feature quantity and a historical feature quantity recorded in historical data is greater than a preset threshold, and specifically includes:
the deviation value of the dispersion of the oscillation amplitude exceeds a preset threshold, or,
the deviation value of the oscillation frequency exceeds a preset threshold, or,
the deviation value of the decay time constant exceeds a preset threshold, or,
the deviation value of the oscillating voltage waveform exceeds a preset threshold.
In a possible implementation manner of the second aspect, the defect analysis module is specifically configured to:
if the deviation value of the decay time constant is larger than the preset threshold value, the equipment parameters of the reactor loop are changed disadvantageously.
In a possible implementation manner of the second aspect, the defect analysis module is specifically configured to:
if the deviation value of the oscillating voltage waveform is larger than the preset threshold value, the reactor loop has the defect of insulation breakdown.
Compared with the prior art, the method and the device for monitoring the loop defect of the reactor based on the bus mutual inductor do not need to install a voltage divider to change the primary side wiring of a system, only need to install a voltage signal acquisition device on the secondary side of the bus mutual inductor, observe the high-frequency component of a reactive loop by the voltage signal of the secondary side, adopt an electric signal real-time monitoring method to replace an offline reconnection test, and have higher safety because the bus wiring does not need to be changed, devices such as a voltage divider and the like do not need to be added, and additional power failure maintenance is not needed to be carried out on the external devices.
In addition, 4 or more reactive compensation outgoing lines are often connected to the bus, the switching process of all reactive devices can be reflected once through bus voltage secondary side observation, the economy is extremely high, transient data with a longer period can be obtained through on-line monitoring, the early defect identification criterion of the reactor is obtained through extraction of voltage characteristic quantities, and effective control of reactor faults can be achieved.
Drawings
Fig. 1 is a schematic flowchart of a method for monitoring a reactor loop defect based on a bus transformer according to an embodiment of the present invention;
fig. 2 is a schematic diagram of switching oscillation occurring on the secondary side electrical signal in an embodiment of the present invention;
fig. 3 is an access schematic diagram of a reactor loop defect monitoring device based on a bus transformer according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a method for monitoring a reactor loop defect based on a bus transformer, including:
and S10, acquiring a secondary side electric signal of the bus transformer.
S11, storing waveforms corresponding to sudden change signals, preset amplitude-frequency signals and switching-on and switching-off signals of all paths of reactors in the secondary side electric signals as transient waveforms; the preset amplitude-frequency signal refers to an electric signal of which the frequency and the amplitude exceed a preset threshold value at the same time.
S12, dividing the transient waveform into a plurality of groups of opening transient waveforms according to the switching time of each path of reactor on the same bus, wherein each group of opening transient waveforms corresponds to one path of reactor loop; when each path of reactor is switched, the secondary side electric signal can generate oscillation with a certain frequency.
And S13, performing feature extraction on the waveforms in the time period containing the target frequency in each group of opening transient waveforms.
And S14, if the deviation value of the extracted characteristic quantity and the historical characteristic quantity recorded by the historical data is larger than a preset threshold value, the reactor loop corresponding to the group of split-gate transient waveforms has defects.
In S11, waveforms corresponding to the sudden change signal, waveforms corresponding to the preset amplitude-frequency signal, and waveforms corresponding to the switching signals of each reactor in the secondary-side electrical signal are stored as transient waveforms, so that the coverage of the stored transient waveforms is as wide as possible, and the switching process of each reactor is prevented from being omitted.
Referring to fig. 2, since the bus voltage has an oscillation process in the reactor opening process, the switching process is determined by using the transient process in the embodiment of the present invention, it is considered that the high-frequency voltage of the reactive loop portion must be observed for the restriking in the past, the bus voltage can reflect the high-frequency component through the actual measurement, and the restriking waveform can be observed at the PT secondary because the high-frequency transfer characteristic of the PT (bus transformer) meets the identification requirement of the restriking waveform.
It should be noted that, the oscillation degree is different in the opening process of different reactors, and experiments and statistical analysis need to be performed in advance.
According to the embodiment of the invention, the long-term monitoring of the switching of the total station reactive equipment is realized through the secondary voltage monitoring of the bus voltage transformer, on one hand, a voltage divider is not required to be installed to change the primary wiring of a system, so that the safety of the equipment and personnel is ensured, on the other hand, due to the long-term installation, the comprehensive comparison of the running conditions of the equipment in different periods can be observed, and the measured result is more feasible. On the other hand, the cost is extremely low and the popularization is convenient because primary equipment is not involved. Because the traditional offline manual switching test is replaced by the online monitoring method, the online monitoring method has the advantages of high safety, large data acquisition amount, small test difficulty and high economy. Finally, besides the low cost, the voltage can be observed through the bus PT to simultaneously obtain the action condition of each loop of reactive outgoing line of the same bus, and the application range is wider.
Illustratively, the feature extraction is performed on the waveforms in the time period containing the target frequency in each group of switching-off transient waveforms, specifically including:
if the waveform frequency of the group of switching transient state waveforms in a time period is equal to the target frequency, feature extraction is carried out on the waveforms in the time period, and the extracted feature quantity comprises oscillation amplitude, oscillation frequency, attenuation time constant and whether amplitude catastrophe points exist.
Illustratively, the deviation value between the extracted feature quantity and the historical feature quantity recorded in the historical data is greater than a preset threshold, and specifically includes:
the deviation value of the dispersion of the oscillation amplitude exceeds a preset threshold, or,
the deviation value of the oscillation frequency exceeds a preset threshold, or,
the deviation value of the decay time constant exceeds a preset threshold, or,
the deviation value of the oscillating voltage waveform exceeds a preset threshold.
For example, if the deviation value between the extracted feature quantity and the historical feature quantity recorded in the historical data is greater than a preset threshold, the reactor loop corresponding to the group of split-gate transient waveforms has a defect, and the method specifically includes:
when the deviation value of the decay time constant is larger than a preset threshold value, the equipment parameters of the reactor loop are changed disadvantageously.
For example, if the deviation value between the extracted feature quantity and the historical feature quantity recorded in the historical data is greater than a preset threshold, the reactor loop corresponding to the group of split-gate transient waveforms has a defect, and the method specifically includes:
when the deviation value of the oscillation voltage waveform is larger than a preset threshold value, the reactor loop has the defect of insulation breakdown. Comparing the extracted characteristic quantity with the previous data, and when the dispersion of the amplitude exceeds a certain value compared with the previous data, the difference of the frequency exceeds a certain value compared with the previous data, the attenuation time constant exceeds a certain value compared with the previous data, voltage waveform mutation (namely, the amplitude and the derivative have mutation) occurs in the oscillation process, and one or more conditions are met, the reactor loop is considered to have defects, for example, when the attenuation time constant changes, the inductance value, the capacitance value and the resistance value of the loop are changed, equipment parameters such as the reactor, the capacitor and the like are necessarily explained to have changes, and when the oscillation voltage waveform has mutation, the possibility of insulation breakdown is shown to occur. When necessary, the related test is carried out without investing again.
Compared with the prior art, the method for monitoring the defect of the reactor loop based on the bus transformer does not need to install a voltage divider to change the primary side wiring of a system, only needs to install a voltage signal acquisition device on the secondary side of the bus transformer, observes the high-frequency component of a reactive loop through the voltage signal of the secondary side, adopts an electric signal real-time monitoring method to replace an offline change-over test, and has higher safety because the bus wiring does not need to be changed, devices such as a voltage divider and the like do not need to be added, and additional power-off maintenance is not needed to be carried out on the added devices.
In addition, 4 or more reactive compensation outgoing lines are often connected to the bus, the switching process of all reactive devices can be reflected once through bus voltage secondary side observation, the economy is extremely high, transient data with a longer period can be obtained through on-line monitoring, the early defect identification criterion of the reactor is obtained through extraction of voltage characteristic quantities, and effective control of reactor faults can be achieved.
The second aspect of the embodiment of the application provides a reactor loop defect monitoring device based on a bus transformer, which is applied to the secondary side of the bus transformer and comprises a signal acquisition module, a waveform storage module, a division module, a feature extraction module and a defect analysis module.
The signal acquisition module is used for acquiring a secondary side electric signal of the bus mutual inductor;
the waveform storage module is used for storing a corresponding waveform of a sudden change signal, a corresponding waveform of a preset amplitude-frequency signal and a corresponding waveform of a switching-on/off signal of each path of reactor as a transient waveform; the preset amplitude-frequency signal refers to an electric signal of which the frequency and the amplitude exceed a preset threshold value simultaneously;
the dividing module is used for dividing the transient waveform into a plurality of groups of switching-off transient waveforms according to the switching time of each path of reactor on the same bus, wherein each group of switching-off transient waveforms corresponds to one path of reactor loop;
the characteristic extraction module is used for extracting the characteristics of the waveforms in the time period containing the target frequency in each group of switching-off transient waveforms;
and the defect analysis module is used for judging that the reactor loop corresponding to the set of brake transient waveforms has defects if the deviation value of the extracted characteristic quantity and the historical characteristic quantity recorded by the historical data is greater than a preset threshold value.
Referring to fig. 3, the device of the present invention is generally directly connected to the "PT secondary voltage" shown in the figure. In the figure, voltage measuring points 2, 3 and 5 are additionally provided with voltage division, but the embodiment of the invention only needs to provide a voltage signal acquisition device on the secondary side of a bus PT (potential transformer) and does not need to actually change primary wiring, so that the device can be installed for a long time.
Illustratively, if the waveform frequency of the group of split gate transient waveforms in a time period is equal to the target frequency, feature extraction is performed on the waveforms in the time period, and the extracted feature quantities include oscillation amplitude, oscillation frequency, decay time constant and whether amplitude discontinuities exist.
Illustratively, the feature extraction module is specifically configured to:
if the waveform frequency of the group of switching transient state waveforms in a time period is equal to the target frequency, feature extraction is carried out on the waveforms in the time period, and the extracted feature quantity comprises oscillation amplitude, oscillation frequency, attenuation time constant and whether amplitude catastrophe points exist.
Illustratively, the deviation value between the extracted feature quantity and the historical feature quantity recorded in the historical data is greater than a preset threshold, and specifically includes:
the deviation value of the dispersion of the oscillation amplitude exceeds a preset threshold, or,
the deviation value of the oscillation frequency exceeds a preset threshold, or,
the deviation value of the decay time constant exceeds a preset threshold, or,
the deviation value of the oscillating voltage waveform exceeds a preset threshold.
Illustratively, the defect analysis module is specifically configured to:
if the deviation value of the decay time constant is larger than the preset threshold value, the equipment parameters of the reactor loop are changed disadvantageously.
Illustratively, the defect analysis module is specifically configured to:
if the deviation value of the oscillating voltage waveform is larger than the preset threshold value, the reactor loop has the defect of insulation breakdown.
Compared with the prior art, the reactor loop defect monitoring device based on the bus transformer provided by the embodiment of the invention does not need to install a voltage divider to change the primary side wiring of a system, only needs to install a voltage signal acquisition device on the secondary side of the bus transformer, observes the high-frequency component of a reactive loop through the secondary side voltage signal, adopts an electric signal real-time monitoring method to replace an offline change-over test, and has higher safety because the bus wiring does not need to be changed, devices such as a voltage divider and the like do not need to be added, and additional power-off maintenance is not needed to be carried out on the added devices.
In addition, 4 or more reactive compensation outgoing lines are often connected to the bus, the switching process of all reactive devices can be reflected once through bus voltage secondary side observation, the economy is extremely high, transient data with a longer period can be obtained through on-line monitoring, the early defect identification criterion of the reactor is obtained through extraction of voltage characteristic quantities, and effective control of reactor faults can be achieved.
It will be clear to those skilled in the art that for the convenience and simplicity of description, the specific working process of the above-described apparatus may refer to the corresponding process in the foregoing method embodiment, which is not reiterated herein.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method for monitoring the defects of a reactor loop based on a bus mutual inductor is characterized by comprising the following steps:
acquiring a secondary side electric signal of the bus mutual inductor;
storing the corresponding waveform of the sudden change signal, the corresponding waveform of the preset amplitude-frequency signal and the corresponding waveform of the opening and closing signal of each path of reactor as a transient waveform; the preset amplitude-frequency signal refers to an electric signal of which the frequency and the amplitude exceed a preset threshold value simultaneously;
dividing the transient waveform into a plurality of groups of switching-off transient waveforms according to the switching time of each path of reactor on the same bus, wherein each group of switching-off transient waveforms corresponds to one path of reactor loop; when each path of reactor is switched, the secondary side electric signal can generate oscillation with a certain frequency;
extracting the characteristics of the waveforms in the time period containing the target frequency in each group of switching-off transient waveforms;
if the deviation value of the extracted characteristic quantity and the historical characteristic quantity recorded by the historical data is larger than a preset threshold value, the reactor loop corresponding to the group of split-gate transient waveforms has defects.
2. The method for monitoring the defects of the reactor loop based on the bus transformer as claimed in claim 1, wherein the step of extracting the characteristics of the waveforms in the time period containing the target frequency in each group of switching-off transient waveforms specifically comprises the steps of:
if the waveform frequency of the group of the split gate transient waveforms in a time period is equal to the target frequency, feature extraction is carried out on the waveforms in the time period, and the extracted feature quantity comprises oscillation amplitude, oscillation frequency, attenuation time constant and whether amplitude catastrophe points exist.
3. The method for monitoring the defects of the reactor loop based on the bus transformer as claimed in claim 1, wherein the step of extracting the deviation value between the extracted characteristic quantity and the historical characteristic quantity recorded by the historical data is greater than a preset threshold specifically comprises the steps of:
the deviation value of the dispersion of the oscillation amplitude exceeds a preset threshold, or,
the deviation value of the oscillation frequency exceeds a preset threshold, or,
the deviation value of the decay time constant exceeds a preset threshold, or,
the deviation value of the oscillating voltage waveform exceeds a preset threshold.
4. The method for monitoring the defects of the reactor loop based on the bus transformer as claimed in claim 1, wherein if the deviation value between the extracted characteristic quantity and the historical characteristic quantity recorded by the historical data is greater than a preset threshold, the reactor loop corresponding to the group of the switching transient waveforms has defects, and specifically comprises:
when the deviation value of the decay time constant is larger than a preset threshold value, the equipment parameters of the reactor loop are changed disadvantageously.
5. The method for monitoring the defects of the reactor loop based on the bus transformer as claimed in claim 1, wherein if the deviation value between the extracted characteristic quantity and the historical characteristic quantity recorded by the historical data is greater than a preset threshold, the reactor loop corresponding to the group of the switching transient waveforms has defects, and specifically comprises:
when the deviation value of the oscillation voltage waveform is larger than a preset threshold value, the reactor loop has the defect of insulation breakdown.
6. The utility model provides a reactor return circuit defect monitoring devices based on bus-bar transformer which characterized in that is applied to bus-bar transformer's secondary side, includes:
the signal acquisition module is used for acquiring a secondary side electric signal of the bus mutual inductor;
the waveform storage module is used for storing a corresponding waveform of a sudden change signal, a corresponding waveform of a preset amplitude-frequency signal and a corresponding waveform of a switching-on/off signal of each path of reactor as a transient waveform; the preset amplitude-frequency signal refers to an electric signal of which the frequency and the amplitude exceed a preset threshold value simultaneously;
the dividing module is used for dividing the transient waveform into a plurality of groups of switching-off transient waveforms according to the switching time of each path of reactor on the same bus, wherein each group of switching-off transient waveforms corresponds to one path of reactor loop; when each path of reactor is switched, the secondary side electric signal can generate oscillation with a certain frequency;
the characteristic extraction module is used for extracting the characteristics of the waveforms in the time period containing the target frequency in each group of switching-off transient waveforms;
and the defect analysis module is used for judging that the reactor loop corresponding to the set of brake transient waveforms has defects if the deviation value of the extracted characteristic quantity and the historical characteristic quantity recorded by the historical data is greater than a preset threshold value.
7. The bus transformer-based reactor loop defect monitoring device according to claim 6, wherein the feature extraction module is specifically configured to:
if the waveform frequency of the group of switching transient state waveforms in a time period is equal to the target frequency, feature extraction is carried out on the waveforms in the time period, and the extracted feature quantity comprises oscillation amplitude, oscillation frequency, attenuation time constant and whether amplitude catastrophe points exist.
8. The device for monitoring the defects of the reactor loop based on the bus transformer as claimed in claim 6, wherein the step of extracting the deviation value between the extracted characteristic quantity and the historical characteristic quantity recorded by the historical data is greater than a preset threshold specifically comprises the steps of:
the deviation value of the dispersion of the oscillation amplitude exceeds a preset threshold, or,
the deviation value of the oscillation frequency exceeds a preset threshold, or,
the deviation of the decay time constant exceeds a preset threshold, or,
the deviation value of the oscillating voltage waveform exceeds a preset threshold.
9. The bus-transformer-based reactor loop defect monitoring device according to claim 6, wherein the defect analysis module is specifically configured to:
if the deviation value of the decay time constant is larger than the preset threshold value, the equipment parameters of the reactor loop are changed disadvantageously.
10. The bus-transformer-based reactor loop defect monitoring device according to claim 6, wherein the defect analysis module is specifically configured to:
if the deviation value of the oscillating voltage waveform is larger than the preset threshold value, the reactor loop has the defect of insulation breakdown.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210789097.3A CN115078914A (en) | 2022-07-06 | 2022-07-06 | Reactor loop defect monitoring method and device based on bus mutual inductor |
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| CN202210789097.3A CN115078914A (en) | 2022-07-06 | 2022-07-06 | Reactor loop defect monitoring method and device based on bus mutual inductor |
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