CN111707909B - Porcelain insulator detection method and porcelain insulator detection circuit - Google Patents
Porcelain insulator detection method and porcelain insulator detection circuit Download PDFInfo
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- CN111707909B CN111707909B CN202010467984.XA CN202010467984A CN111707909B CN 111707909 B CN111707909 B CN 111707909B CN 202010467984 A CN202010467984 A CN 202010467984A CN 111707909 B CN111707909 B CN 111707909B
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- 229910052573 porcelain Inorganic materials 0.000 title claims abstract description 219
- 239000012212 insulator Substances 0.000 title claims abstract description 209
- 238000001514 detection method Methods 0.000 title claims abstract description 76
- 230000008859 change Effects 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 42
- 229910052742 iron Inorganic materials 0.000 claims description 21
- 238000005259 measurement Methods 0.000 claims description 16
- 238000005070 sampling Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 11
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000009421 internal insulation Methods 0.000 abstract description 5
- 238000000105 evaporative light scattering detection Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 238000009413 insulation Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000825 ultraviolet detection Methods 0.000 description 1
Classifications
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
-
- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/18—Subjecting similar articles in turn to test, e.g. go/no-go tests in mass production
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention provides a porcelain insulator detection method and a porcelain insulator detection circuit, wherein the porcelain insulator detection method comprises the following steps: s101: respectively transmitting impulse voltage to a normal porcelain insulator and a porcelain insulator to be tested through an impulse voltage generator, and acquiring voltage change waveform data by utilizing a measuring loop; s102: acquiring the charge quantity, the first equivalent charge quantity and the second equivalent charge quantity of the porcelain insulator to be tested of the normal porcelain insulator according to the acquired voltage sequence and time sequence; s103: judging whether the porcelain insulator to be detected is a deteriorated porcelain insulator or not according to whether the second equivalent charge quantity is smaller than the product of the first equivalent charge quantity and a preset threshold value. According to the invention, the impulse voltage generator is used for sending impulse voltage to the porcelain insulator, the internal defect of the porcelain insulator is broken down by using the short-time high voltage of the impulse voltage, the internal insulation problem is exposed, the leakage detection problem of the deteriorated porcelain insulator is avoided, the pressurizing time is short, the power is low, the energy consumption is low, and the miniaturization and the mass detection of the detection equipment are facilitated.
Description
Technical Field
The invention relates to the field of electrical equipment detection, in particular to a porcelain insulator detection method and a porcelain insulator detection circuit.
Background
Porcelain insulators are important equipment components of power transmission and transformation systems, and are widely used in power grid systems such as high-voltage transmission lines and transformer substations, and play roles in mechanical support and electric insulation of transmission wires. Among various porcelain insulators, porcelain insulators are the porcelain insulators with the largest use amount, and the porcelain insulators have the remarkable advantages that porcelain has good chemical stability, porcelain materials basically cannot age, and meanwhile, the porcelain insulators are good in mechanical property and simpler in matching mode with an electrical system. In addition, the porcelain insulator has high cost performance, and is the most mature and most experienced product in the aspects of cooperation installation and maintenance technology.
For porcelain insulators, there are many reasons for the deterioration of the mechanical properties of porcelain insulators, which is called deterioration of porcelain insulators, due to the loss of insulating ability. Porcelain insulators may deteriorate during production, transportation and installation, and operation. During production, the porcelain insulator has micro-pores and micro-cracks in the manufacturing process, and the defects such as gaps are caused by inconsistent shrinkage coefficients of the connecting piece and the porcelain piece material. In the transportation and installation process, the head defect of the porcelain part is also caused by collision and other reasons. After the porcelain insulator is put into operation, the porcelain insulator has poor self tensile property, and air holes and cracks in the porcelain insulator are expanded to cause degradation in long-time operation. In order to eliminate the deteriorated porcelain insulator and ensure the safe and reliable operation of the power grid, an accurate and effective detection means of the deteriorated porcelain insulator must be provided.
However, the conventional detection and analysis means can only detect the insulation resistance value of the porcelain insulator, and the applied voltage level is low, so that cracks in the porcelain cannot be exposed, and the deteriorated porcelain insulator cannot be completely detected. With the development of various zero-value porcelain insulator detection devices in recent years, the equipment with small detection equipment and high detection speed is gradually applied to the defect detection field of power grid equipment, such as infrared detection, ultraviolet detection, ultrasonic detection and the like. However, the methods are influenced by pollution on the outer surface of the porcelain insulator and environmental acousto-optic and electric noise, the accuracy is poor, the internal problem of the porcelain insulator porcelain can not be exposed, and a large amount of missing detection exists on the deteriorated porcelain insulator.
The head of the porcelain piece is cracked, but a degraded porcelain insulator of a penetrating channel is not formed, and the measured insulation resistance value is still higher by using a low-voltage-class megger, and the insulation resistance value can be detected only by a power frequency withstand voltage test in the prior art. Increasing the detection voltage is a necessary means for detecting the deteriorated porcelain insulator. However, the industrial frequency withstand voltage test requires special equipment, so that the equipment is large in volume, long in single pressurization time, few in application places and inconvenient to detect in a large scale.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the porcelain insulator detection method and the porcelain insulator detection circuit, wherein the impulse voltage generator is used for sending impulse voltage to the porcelain insulator, the internal defects of porcelain insulator porcelain pieces are broken down by using the short-time high voltage of the impulse voltage, the internal insulation problem is exposed, the problem of missing detection of the deteriorated porcelain insulator is avoided, the pressurizing time is short, the power is low, the energy consumption is low, the judgment logic is simple and convenient to integrate, the miniaturization of detection equipment is facilitated, the application place is wide, and the detection is convenient to be carried out in a large batch.
In order to solve the problems, the invention adopts a technical scheme that: a porcelain insulator detection method, the porcelain insulator detection method comprising: s101: respectively transmitting impulse voltage to a normal porcelain insulator and a porcelain insulator to be tested through an impulse voltage generator, and acquiring voltage change waveform data of the normal porcelain insulator and the porcelain insulator to be tested through a measuring loop; s102: acquiring a voltage sequence of the voltage variation waveform data and a time sequence corresponding to the voltage sequence, and acquiring the electric charge quantity and the first equivalent electric charge quantity of the iron cap of the normal porcelain insulator and the second equivalent electric charge quantity of the iron cap of the porcelain insulator to be tested according to the voltage sequence and the time sequence; s103: and judging whether the second equivalent charge quantity is smaller than the product of the first equivalent charge quantity and a preset threshold value, if so, determining that the porcelain insulator to be detected is a deteriorated porcelain insulator, and if not, determining that the porcelain insulator to be detected is a qualified porcelain insulator.
Further, the measuring loop comprises a high-voltage probe and a waveform sampling circuit, and the waveform sampling circuit is connected with the two ends of the normal porcelain insulator and the porcelain insulator to be measured through the high-voltage probe.
Further, before the step of acquiring the voltage sequence of the voltage variation waveform data and the time sequence corresponding to the voltage sequence, the method further includes:
and removing burrs in the voltage variation waveform data by means of low-pass filtering.
Further, the impulse voltage generator generates high voltage of 60-100kv when in idle load, and the rising time of the impulse voltage applied to the porcelain insulator to be tested and the normal porcelain insulator is lower than 10ms.
Further, the input impedance of the measurement loop is greater than 1gΩ, and the sampling interval of the measurement loop is not greater than 1ms.
Further, the time interval of the time series is equal to the sampling interval of the measurement loop.
Further, the step of acquiring the electric charge amount of the iron cap of the normal porcelain insulator according to the voltage sequence and the time sequence specifically comprises the following steps: by the formula And acquiring the electric charge quantity of the iron cap of the normal porcelain insulator, wherein Q is the electric charge quantity of the iron cap, R 1 is the equivalent resistance of the normal porcelain insulator, R 0 is the input impedance of the measuring loop, T is the time interval of the time sequence, I 1 is the current flowing through the equivalent resistance, I 0 is the current flowing through the measuring loop, U 0 is the voltage acquired by the measuring loop, and U i is the ith voltage in the voltage sequence.
Further, the impulse voltage generator sends impulse voltage to the normal porcelain insulator and the porcelain insulator to be tested through the high-voltage silicon stack.
Further, the preset threshold is 0.8.
Based on the same inventive concept, the invention also provides a porcelain insulator detection circuit, which comprises an impulse voltage generator and a measurement loop; the positive electrode and the negative electrode of the impulse voltage generator are respectively connected with the two ends of the normal porcelain insulator or the porcelain insulator to be tested; the measuring loop is connected with two ends of the normal porcelain insulator or the porcelain insulator to be measured; the porcelain insulator detection circuit detects whether the porcelain insulator to be detected is a deteriorated porcelain insulator or not through the porcelain insulator detection method.
Compared with the prior art, the invention has the beneficial effects that: the impulse voltage generator is used for sending impulse voltage to the porcelain insulator, internal defects of porcelain insulator porcelain pieces are broken down by utilizing short-time high voltage of the impulse voltage, internal insulation problems are exposed, the problem of missing detection of the deteriorated porcelain insulator is avoided, the pressurizing time is short, the power is low, the energy consumption is low, the judgment logic is simple and convenient to integrate, the detection equipment is convenient to miniaturize, the application place is wide, and the detection is convenient to conduct in a large batch.
Drawings
FIG. 1 is a flowchart of an embodiment of a porcelain insulator detection method of the present invention;
FIG. 2 is a circuit diagram of an embodiment of a porcelain insulator detection circuit used in the porcelain insulator detection method of the present invention;
FIG. 3 is a schematic diagram of an embodiment of the pressurization amplitudes of a qualified porcelain insulator and a degraded porcelain insulator in the porcelain insulator detection method of the present invention;
FIG. 4 is an equivalent circuit diagram of one embodiment of a portion of the porcelain insulator detection circuit in the porcelain insulator detection method of the present invention;
FIG. 5 is a flowchart of another embodiment of the porcelain insulator detection method of the present invention;
FIG. 6 is a circuit diagram of an embodiment of the porcelain insulator detection circuit of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.
Referring to fig. 1-5, fig. 1 is a flowchart illustrating an embodiment of a method for detecting a porcelain insulator according to the present invention; FIG. 2 is a circuit diagram of an embodiment of a porcelain insulator detection circuit used in the porcelain insulator detection method of the present invention; FIG. 3 is a schematic diagram of an embodiment of the pressurization amplitudes of a qualified porcelain insulator and a degraded porcelain insulator in the porcelain insulator detection method of the present invention; FIG. 4 is an equivalent circuit diagram of one embodiment of a portion of the porcelain insulator detection circuit in the porcelain insulator detection method of the present invention; FIG. 5 is a flowchart of another embodiment of the porcelain insulator detection method of the present invention. The method for detecting the porcelain insulator of the invention is described in detail with reference to fig. 1 to 5.
According to the porcelain insulator detection method, impact voltage is firstly applied to a normal porcelain insulator, and voltage waveforms at two ends of the normal porcelain insulator are acquired to obtain standard waveforms, so that the discharge charge quantity of an iron cap of the normal porcelain insulator is obtained; pressurizing the porcelain insulator to be tested to obtain the discharge charge quantity; and judging whether the porcelain insulator has defects or not by comparing and calculating the difference of the discharge charge quantity of the normal porcelain insulator of the discharge charge quantity of the to-be-detected piece so as to identify the deteriorated porcelain insulator.
In this embodiment, the porcelain insulator detection method specifically includes:
S101: and respectively transmitting impulse voltage to the normal porcelain insulator and the porcelain insulator to be tested through the impulse voltage generator, and acquiring voltage change waveform data of the normal porcelain insulator and the porcelain insulator to be tested by utilizing a measuring loop.
In this embodiment, the measurement loop includes a high-voltage probe and a waveform sampling circuit, and the waveform sampling circuit is connected to both ends of the normal porcelain insulator and the porcelain insulator to be measured through the high-voltage probe.
In one particular embodiment, the waveform sampling circuit is an oscilloscope.
In this embodiment, the normal porcelain insulator is a qualified porcelain insulator having no cracks inside.
In the embodiment, the impulse voltage generator generates high voltage of 60-100kv when no load is applied, namely, the impulse voltage is sent to the porcelain insulator, and the rising time of the impulse voltage applied to the porcelain insulator to be tested and the normal porcelain insulator is lower than 10ms.
In a specific embodiment, the normal porcelain insulator and the porcelain insulator to be tested are the same in type and are both porcelain insulators.
In this embodiment, the surge voltage generator sends surge voltage to the normal porcelain insulator or the porcelain insulator to be tested through the high-voltage silicon stack, so that after the surge voltage is sent, the parameter change of the surge voltage generator is guaranteed not to influence the voltage attenuation on the normal porcelain insulator and the porcelain insulator to be tested, and the accuracy of the voltage change waveform data is further guaranteed.
In a specific embodiment, the positive electrode of the impulse voltage generator is connected with a normal porcelain insulator or a porcelain insulator to be tested through a high-voltage silicon stack.
In this embodiment, the waveform sampling circuit is provided with a trigger that triggers simultaneously with the trigger of the impulse voltage generator to enable the measurement loop to collect the voltage variation waveform when the impulse voltage generator emits an impulse voltage.
In this embodiment, the input impedance of the measurement loop is greater than 1gΩ, and the sampling interval of the waveform sampling circuit in the measurement loop is not greater than 1ms.
S102: and acquiring a voltage sequence and a time sequence corresponding to the voltage sequence of the voltage variation waveform data, and acquiring the electric charge quantity and the first equivalent electric charge quantity of the iron cap of the normal porcelain insulator or the second equivalent electric charge quantity of the iron cap of the porcelain insulator to be tested according to the voltage sequence and the time sequence.
In this embodiment, the step of acquiring the voltage sequence of the voltage variation waveform data and the time sequence corresponding to the voltage sequence further includes: the burr in the voltage variation waveform data is removed by means of low-pass filtering.
In this embodiment, the voltage in the surge voltage waveform detected by the measurement loop increases rapidly with time, and then decays slowly, and the time interval of the acquired time sequence is equal to the sampling interval of the measurement loop.
In this embodiment, the step of acquiring the charge amount of the iron cap of the normal porcelain insulator according to the voltage sequence and the time sequence specifically includes: by the formula And acquiring the electric charge quantity of the iron cap of the normal porcelain insulator, wherein Q is the electric charge quantity of the iron cap, R 1 is the equivalent resistance of the normal porcelain insulator, R 0 is the input impedance of a measuring loop, T is the time interval of a time sequence, I 1 is the current flowing through the equivalent resistance, I 0 is the current of the measuring loop, U 0 is the voltage acquired by the measuring loop, and U i is the ith voltage in the voltage sequence.
In this embodiment, the input impedance of the measurement loop may be obtained by a device parameter or measurement.
In this embodiment, the first equivalent charge amount is Q eq,Qeq＝(∑ui) to Q, i.e., the first equivalent charge amount is proportional to the charge amount on the normal porcelain insulator cap.
The same impulse voltage generator is adopted to apply impulse voltage to the porcelain insulator to be tested, voltage change waveform data are obtained, and then the second equivalent charge quantity Q' eq of the iron cap of the porcelain insulator to be tested is obtained through the same method.
S103: and judging whether the second equivalent electric charge quantity is smaller than the product of the first equivalent electric charge quantity and a preset threshold value, if so, determining that the porcelain insulator to be detected is a deteriorated porcelain insulator, and if not, determining that the porcelain insulator to be detected is a qualified porcelain insulator.
In this embodiment, the preset threshold is 0.8, and in other embodiments, the preset threshold is 0.85, 0.9, and other values capable of identifying the degraded porcelain insulator, and the magnitude of the preset threshold may be set according to the actual situation, which is not limited herein.
In this embodiment, since the internal crack of the degraded porcelain insulator is broken down to cause discharge, a part of electric charges circulate from the internal crack, and the difference of the electric charges of the porcelain insulator to be tested and the normal porcelain insulator on the iron cap is compared, so that it can be determined whether the porcelain insulator to be tested is the degraded porcelain insulator. Since the second equivalent charge amount is proportional to the actual charge amount of the iron cap of the porcelain insulator to be tested, only the second equivalent charge amount and the first equivalent charge amount need to be compared, i.e. if Q' eq < Q, the porcelain insulator to be tested is considered as a deteriorated porcelain insulator.
The porcelain insulator detection method provided by the invention has the advantages that the impulse voltage level applied is high, the internal defects of porcelain insulator parts can be effectively exposed, the influence of external pollution and environmental acousto-optic-electric noise is avoided, the degradation judgment accuracy is high, the measurement time is short, the pressurizing time is short, the efficiency is high, the small portability of detection equipment can be realized, and the detection personnel can conveniently and rapidly and accurately detect a large amount of porcelain insulator materials.
The beneficial effects are that: according to the porcelain insulator detection method, the impulse voltage generator is used for sending the impulse voltage to the porcelain insulator, the internal defects of porcelain insulators are broken down by using the short-time high voltage of the impulse voltage, the internal insulation problem is exposed, the problem of missing detection of the deteriorated porcelain insulator is avoided, the pressurizing time is short, the power is low, the energy consumption is low, the judgment logic is simple and convenient to integrate, the detection equipment is convenient to miniaturize, the application place is wide, and the detection is convenient to carry out in a large scale.
Based on the same inventive concept, the present invention further provides a porcelain insulator detection circuit, please refer to fig. 6, fig. 6 is a circuit diagram of an embodiment of the porcelain insulator detection circuit of the present invention, and the porcelain insulator detection circuit of the present invention is specifically described with reference to fig. 6.
In the embodiment, the porcelain insulator detection circuit comprises an impulse voltage generator and a measurement loop; the positive electrode and the negative electrode of the impulse voltage generator are respectively connected with the two ends of the normal porcelain insulator or the porcelain insulator to be tested; the measuring loop is connected with two ends of the normal porcelain insulator or the porcelain insulator to be measured; the porcelain insulator detection circuit detects whether the porcelain insulator to be detected is a deteriorated porcelain insulator by the porcelain insulator detection method described in the above embodiment.
The beneficial effects are that: the porcelain insulator detection circuit disclosed by the invention sends the impulse voltage to the porcelain insulator through the impulse voltage generator, internal defects of porcelain insulator porcelain pieces are broken down by utilizing short-time high voltage of the impulse voltage, the internal insulation problem is exposed, the problem of missing detection of the deteriorated porcelain insulator is avoided, the pressurizing time is short, the power is low, the energy consumption is low, the judgment logic is simple and convenient to integrate, the detection equipment is convenient to miniaturize, the application place is wide, and the detection is convenient to carry out in a large scale.
In the several embodiments provided by the present invention, it should be understood that the disclosed devices, modules, and circuits may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, and for example, the structural device division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple or modules may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be through some interface, device or indirect coupling or communication connection, whether electrical, mechanical or otherwise.
The components described as separate components may or may not be physically separate, and components shown may or may not be physically located in one place, or may be distributed in a plurality of positions. Some or all of them may be selected according to actual needs to achieve the object of the embodiment.
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.
Claims (6)
1. The porcelain insulator detection method is characterized by comprising the following steps of:
S101: respectively transmitting impulse voltage to a normal porcelain insulator and a porcelain insulator to be tested through an impulse voltage generator, and acquiring voltage change waveform data of the normal porcelain insulator and the porcelain insulator to be tested through a measuring loop, wherein the measuring loop comprises a high-voltage probe and a waveform sampling circuit, the waveform sampling circuit is connected with two ends of the normal porcelain insulator and the porcelain insulator to be tested through the high-voltage probe, the input impedance of the measuring loop is larger than 1GΩ, and the sampling interval of the measuring loop is not larger than 1ms; the impulse voltage generator generates high voltage of 60-100kv when in no-load, and the rising time of the impulse voltage applied to the porcelain insulator to be tested and the normal porcelain insulator is lower than 10ms;
S102: acquiring a voltage sequence of the voltage variation waveform data and a time sequence corresponding to the voltage sequence, and acquiring the electric charge quantity and the first equivalent electric charge quantity of the iron cap of the normal porcelain insulator and the second equivalent electric charge quantity of the iron cap of the porcelain insulator to be tested according to the voltage sequence and the time sequence;
the step of obtaining the electric charge quantity of the iron cap of the normal porcelain insulator according to the voltage sequence and the time sequence specifically comprises the following steps:
By the formula Acquiring the electric charge of the iron cap of the normal porcelain insulator, wherein Q is the electric charge of the iron cap, R 1 is the equivalent resistance of the normal porcelain insulator, R 0 is the input impedance of the measuring loop, T is the time interval of the time sequence, I 1 is the current flowing through the equivalent resistance, I 0 is the current flowing through the measuring loop, U 0 is the voltage acquired by the measuring loop, and U i is the ith voltage in the voltage sequence;
The first equivalent electric charge quantity is Q eq＝(∑ui) to Q, namely the first equivalent electric charge quantity is in direct proportion to the electric charge quantity on the iron cap of the normal porcelain insulator;
Acquiring a second equivalent charge quantity Q eq' of the iron cap of the porcelain insulator to be detected by the same method;
S103: and judging whether the second equivalent charge quantity is smaller than the product of the first equivalent charge quantity and a preset threshold value, if so, determining that the porcelain insulator to be detected is a deteriorated porcelain insulator, and if not, determining that the porcelain insulator to be detected is a qualified porcelain insulator.
2. The porcelain insulator detection method according to claim 1, wherein the step of acquiring the voltage sequence of the voltage variation waveform data and the time sequence corresponding to the voltage sequence is preceded by the step of further comprising:
and removing burrs in the voltage variation waveform data by means of low-pass filtering.
3. The porcelain insulator detection method of claim 1, wherein the time series has a time interval equal to a sampling interval of the measurement loop.
4. The porcelain insulator detection method according to claim 1, wherein the surge voltage generator transmits a surge voltage to the normal porcelain insulator and the porcelain insulator to be tested through a high voltage silicon stack.
5. The porcelain insulator detection method of claim 1, wherein the preset threshold value is 0.8.
6. The porcelain insulator detection circuit is characterized by comprising an impulse voltage generator and a measurement loop;
The positive electrode and the negative electrode of the impulse voltage generator are respectively connected with the two ends of the normal porcelain insulator or the porcelain insulator to be tested;
the measuring loop is connected with two ends of the normal porcelain insulator or the porcelain insulator to be measured;
the porcelain insulator detection circuit detects whether the porcelain insulator to be detected is a deteriorated porcelain insulator by the porcelain insulator detection method according to any one of claims 1 to 5.
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| CN113092864A (en) * | 2021-04-20 | 2021-07-09 | 清华珠三角研究院 | Method for detecting degraded porcelain insulator |
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