CN117031222A - Partial discharge pulse current sensing unit and detection method thereof - Google Patents
Partial discharge pulse current sensing unit and detection method thereof Download PDFInfo
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- CN117031222A CN117031222A CN202310994162.0A CN202310994162A CN117031222A CN 117031222 A CN117031222 A CN 117031222A CN 202310994162 A CN202310994162 A CN 202310994162A CN 117031222 A CN117031222 A CN 117031222A
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- 239000004020 conductor Substances 0.000 claims abstract description 80
- 238000004804 winding Methods 0.000 claims abstract description 72
- 239000003990 capacitor Substances 0.000 claims abstract description 16
- 238000012360 testing method Methods 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 20
- 230000035699 permeability Effects 0.000 claims description 9
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000009413 insulation Methods 0.000 abstract description 6
- 230000035945 sensitivity Effects 0.000 description 15
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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
- G01R31/1254—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 gas-insulated power appliances or vacuum gaps
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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
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Abstract
The invention provides a partial discharge pulse current sensing unit and a detection method thereof, and relates to the technical field of discharge detection. The sensing unit is arranged in a high-voltage conductor cavity of the gas insulation equipment; the partial discharge pulse current sensing unit comprises a first winding, a second winding and an inductance L 1 Capacitance C, detection resistance R L The first winding and the second winding are wound on the annular magnetic core, two ends of the first winding are respectively connected to the first high-voltage conductor and the second high-voltage conductor, the capacitor C is connected between the first winding and the first high-voltage conductor, two ends of the inductor L are respectively connected to the first high-voltage conductor and the second high-voltage conductor, and two ends of the second winding are respectively connected with the detection resistor R L The two ends of the partial discharge pulse current sensing unit are connected to form an output end of the partial discharge pulse current sensing unit, and the output end is used for being connected with the acquisition device. The sensing unit and the detection method can realize partial discharge high-potential detection and can eliminate ground potential serial-inInterference and reducing the measurement error of partial discharge.
Description
Technical Field
The invention relates to the technical field of discharge detection, in particular to a partial discharge pulse current sensing unit and a detection method thereof.
Background
The gas-insulated switchgear (English name: gas insulated switchgear, abbreviated as GIS) and the gas-insulated transmission line (English name: gas-insulated transmission lines, abbreviated as GIL) have the advantages of compact structure, small occupied area, strong environment adaptability and the like, and are widely applied to electric energy production and transmission links of large hydropower stations, ultra/extra-high voltage substations, extra-high voltage direct current converter stations and the like. GIS and GIL are used as key core equipment of the power system, and the operation reliability of the GIS and GIL directly relates to the safety and stability of the whole power grid energy transmission channel.
At present, the local discharge monitoring of the GIL and GIS field handover test mostly adopts an ultrahigh frequency method and an ultrasonic method, but on one hand, the ultrahigh frequency method and the ultrasonic method have insufficient detection sensitivity on the surface micro defects of the insulator, and the quality and effect of the insulator are difficult to meet the field handover test requirement; on the other hand, the amplitudes of the ultrahigh frequency signal and the ultrasonic signal have no direct corresponding relation with the local discharge capacity, the local discharge capacity of the micro defects on the surface of the GIS insulator cannot be measured, and the development degree of the local discharge is difficult to evaluate effectively. The pulse current method can quantitatively measure the discharge capacity of partial discharge, and in principle, the detection sensitivity is higher, so that the method is the most basic and effective method for measuring the partial discharge. However, because the capacitance of the GIL and the GIS equipment is larger, the coupling capacitance is difficult to meet the requirement by using the traditional pulse current detection mode, and the detection sensitivity is lower. In addition, the pulse current method has a low detection frequency, usually below megahertz, and is easily interfered by complex noise in the field handover test process, so that the pulse current method is difficult to apply in the field.
Compared with the traditional pulse current detection method, the GIS and GIL high-potential partial discharge pulse current measurement is carried out, the partial discharge pulse current detection module is implanted into the high-voltage conductor and is connected in series into the high-voltage loop, so that the detection of the partial discharge high potential is realized, the problem that the detection impedance cannot be connected in series onto the test article grounding line in the GIL and GIS factory test and the field handover test is effectively solved, meanwhile, the interference of ground potential connection can be eliminated, and the partial discharge measurement error is reduced. However, for the whole interval GIS or long-distance GIL, the capacity of the sample is large, the current flowing through the high-voltage conductor is large during the detection of the partial discharge test, especially for the ultra/extra-high voltage GIS and GIL, the test voltage is higher, the power frequency test current in the test process is larger, the saturation of the detection impedance magnetic core in the high-potential partial discharge detection system is easy to cause, the detection sensitivity is seriously affected, and meanwhile, the increase of the magnetic core loss and the serious heating are also caused. In order to better apply GIS and GIL high-potential partial discharge pulse current detection, the problem of power frequency saturation of a detection impedance magnetic core needs to be solved.
Disclosure of Invention
The invention aims to provide a partial discharge pulse current sensing unit and a detection method thereof, which can realize partial discharge high-potential detection, eliminate interference of ground potential serial-in and reduce partial discharge measurement errors.
Embodiments of the invention may be implemented as follows:
in a first aspect, an embodiment of the present invention provides a partial discharge pulse current sensing unit, where the partial discharge pulse current sensing unit is applied to a gas insulation device, and the gas insulation device includes a first high voltage conductor, a second high voltage conductor, and a high voltage conductor cavity connected to the first high voltage conductor, and the partial discharge pulse current sensing unit is installed in the high voltage conductor cavity;
partial discharge pulse current sensing unitComprises a first winding, a second winding and a detection resistor R L The first winding and the second winding are wound on the annular magnetic core, two ends of the first winding are respectively connected to the first high-voltage conductor and the second high-voltage conductor, and two ends of the second winding are respectively connected with the detection resistor R L The two ends of the partial discharge pulse current sensing unit are connected to form an output end of the partial discharge pulse current sensing unit, and the output end is used for being connected with the acquisition device.
The partial discharge pulse current sensing unit provided by the embodiment of the invention has the beneficial effects that:
compared with the traditional mode of stringing detection impedance on the ground wire, the local discharge pulse current sensing unit is implanted into the high-voltage conductor and stringed into the high-voltage loop to realize local discharge high-potential detection, so that the problem that the detection impedance cannot be stringed on the test sample ground wire in the GIL and GIS factory test and the field handover test can be solved, and the interference of ground potential stringing can be eliminated, and the local discharge measurement error can be reduced.
In an alternative embodiment, the number of turns of both the first winding and the second winding is greater than 30 turns.
In an alternative embodiment, the relative permeability of the toroidal core is greater than 10000.
In an alternative embodiment, the partial discharge pulse current sensing unit further comprises an inductance L 1 Inductance L 1 The two ends of the first branch circuit are used for being connected to the first high-voltage conductor and the second high-voltage conductor respectively to form a first branch circuit, and the first branch circuit is used as a power frequency test current circulation branch circuit.
In an alternative embodiment, the partial discharge pulse current sensing unit further includes a capacitor C, the capacitor C is connected between the first winding and the first high-voltage conductor, the branch where the capacitor C is located is a second branch, and the second branch is used as a partial discharge detection branch.
In a second aspect, the present invention provides a method for detecting a partial discharge pulse current, where the method uses the partial discharge pulse current sensing unit according to the foregoing embodiment, and the method includes:
disconnecting the high-voltage conductor of the gas insulation device to form a first high-voltage conductor, a second high-voltage conductor and a high-voltage conductor cavity connected to the first high-voltage conductor;
installing a partial discharge pulse current sensing unit in the high-voltage conductor cavity;
the output end of the partial discharge pulse current sensing unit is connected to the acquisition device.
In an alternative embodiment, the partial discharge pulse current sensing unit further comprises an inductance L 1 And a capacitance C;
inductance L 1 The two ends of the first branch circuit are used for being connected to the first high-voltage conductor and the second high-voltage conductor respectively to form a first branch circuit, and the first branch circuit is used as a power frequency test current circulation branch circuit;
the capacitor C is connected between the first winding and the first high-voltage conductor, the branch where the capacitor C is located is a second branch, and the second branch is used as a partial discharge detection branch.
By adding capacitance C and inductance L 1 The magnetic core saturation problem caused by the large power frequency test current can be avoided, meanwhile, the detection sensitivity is not greatly reduced, the magnetic core saturation problem caused by the power frequency test current can be effectively solved on the premise that the detection sensitivity is ensured as much as possible, and the high-sensitivity high-potential partial discharge pulse current detection is realized.
In an alternative embodiment, the current I flowing through the first winding 2 The calculation formula of (2) is as follows:
wherein ω is angular frequency, L 2 An equivalent inductance formed by the first winding, I 0 I for the current flowing through the high-voltage conductor 1 For flowing through inductance L 1 Is set in the above-described range).
Thus, at lower frequencies, I 2 ≈ω 2 CL 1 I 0 By selecting a relatively small capacitance C and inductance L 1 The power frequency test current flowing through the first winding can be made smaller; at higher frequencies, I 2 ≈I 0 L 1 /(L 1 +L 2 ) By selecting an appropriate inductance L 1 Equivalent inductance L with the first winding 2 The high frequency current flowing through the first winding is not reduced too much by the cooperation.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an application scenario of a partial discharge pulse current sensing unit according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a partial discharge pulse current sensing unit according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a partial discharge pulse current sensing unit according to a second embodiment of the present invention;
FIG. 4 is a schematic diagram of an equivalent circuit of a partial discharge pulse current sensing unit according to a second embodiment of the present invention;
fig. 5 is a schematic diagram showing an effect of suppressing a power frequency test current in a partial discharge pulse current sensing unit according to a second embodiment of the present invention.
Icon: 1-tested device phase a; 2-phase B of the device under test; 3-high voltage conductors; 4-pressurizing means; 5-a first high voltage conductor; 6-a second high voltage conductor; 7-a high voltage conductor cavity; 8-a partial discharge pulse current sensing unit; 9-a first winding; 10-a second winding; 11-sense resistor R L The method comprises the steps of carrying out a first treatment on the surface of the 12-a toroidal core; 13-inductance L 1 The method comprises the steps of carrying out a first treatment on the surface of the 14-capacitance C.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus it should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
First embodiment
Referring to fig. 1 and 2, the present embodiment provides a partial discharge pulse current sensing unit 8, and the partial discharge pulse current sensing unit 8 is applied to a gas insulation device, where the gas insulation device may be GIL or GIS.
As shown in fig. 1, the application scenario of the partial discharge pulse current sensing unit 8 is that the tested device a phase 1 and the tested device B phase 2 are respectively connected to the pressurizing device 4 through the high-voltage conductor 3, and the partial discharge pulse current sensing unit 8 is installed on the high-voltage conductor 3.
Specifically, referring to fig. 2, the gas-insulated apparatus includes a first high-voltage conductor 5, a second high-voltage conductor 6, and a high-voltage conductor cavity 7 connected to the first high-voltage conductor 5, the high-voltage conductor cavity 7 is not connected to the second high-voltage conductor 6, the partial discharge pulse current sensing unit 8 is installed in the high-voltage conductor cavity 7, and the high-voltage conductor cavity 7 forms an electric field shield for the partial discharge pulse current sensing unit 8.
The partial discharge pulse current sensing unit 8 comprises a first winding 9, a second winding 10 and a detection resistor R L 11 and a ring-shaped magnetic core 12, the first winding 9 and the second winding 10 are wound on the ring-shaped magnetic core 12, two ends of the first winding 9 are used for being respectively connected to the first high-voltage conductor 5 and the second high-voltage conductor 6, and two ends of the second winding 10 are respectively connected with the detection resistor R L And two ends of the power supply 11 are connected to form an output end of the partial discharge pulse current sensing unit 8, and the output end is used for being connected with the acquisition device.
The first winding 9 and the second winding 10 are coupled through the magnetic field of the annular magnetic core 12, and are not directly electrically connected, so that the damage of high voltage to the acquisition device is avoided.
The working principle of the partial discharge pulse current sensing unit 8 provided in this embodiment is as follows:
when partial discharge exists in the gas-insulated device, high-frequency pulse current (frequency is usually hundreds of kHz) generated by the discharge flows through the high-voltage conductor 3 and the first winding 9 of the partial discharge pulse current sensing unit 8, the high-frequency pulse current flows through the first winding 9, and a changing magnetic flux is generated in the annular magnetic core 12, so that an output voltage is induced at both ends of the second winding 10, and the effect of detecting the partial discharge pulse current is achieved. In general, the pulse current generated by the discharge is small (< 1 mA), and for obtaining a good detection effect, the number of turns of the first winding 9 and the second winding 10 is more than 30 turns, and the toroidal core 12 is made of a high magnetic permeability material, so that the relative magnetic permeability of the toroidal core 12 is higher than 10000. Wherein a larger number of winding turns and a higher relative permeability can enable a smaller pulse current in the first winding 9 to be coupled to the second winding 10 to the greatest extent, improving the detection sensitivity.
The partial discharge pulse current sensing unit 8 provided in this embodiment has the following beneficial effects:
compared with the traditional mode of stringing detection impedance on the ground wire, the local discharge pulse current sensing unit 8 is implanted into the high-voltage conductor 3 and stringed into the high-voltage loop to realize local discharge high-potential detection, so that the problem that the detection impedance cannot be stringed on the test article ground wire in the GIL and GIS factory test and the field handover test can be solved, and the interference of ground potential stringing can be eliminated, and the local discharge measurement error is reduced.
Second embodiment
Referring to fig. 3 and 4, the present embodiment provides a partial discharge pulse current sensing unit 8, which is similar to the sensing unit provided in the first embodiment in that an inductor L is added 1 13 and a capacitor C14.
In the case of high-potential partial discharge detection, a commercial frequency test current flows through the first winding 9 in addition to a high-frequency pulse current generated by discharge. The power frequency test current is usually larger and can reach more than 1A. Especially for ultra-high or ultra-high voltage GIL equipment, the test voltage is higher, the capacitance value of the test sample is larger, and the power frequency test current can even reach more than 10A. When the power frequency test current flows through the first winding 9 due to the large winding number and high relative magnetic permeability, large magnetic flux is generated in the annular magnetic core 12, so that the magnetic flux of the annular magnetic core 12 is saturated, the detection sensitivity and the distortion pulse current waveform are greatly reduced when the annular magnetic core 12 works in a saturated state, the partial discharge pulse current detection is greatly influenced, and meanwhile, the loss of the annular magnetic core 12 is increased, and the heating is serious. Saturation of the toroidal core 12 can be avoided by reducing the number of winding turns, or by choosing a toroidal core 12 of low relative permeability (even if the relative permeability is < 1000), but correspondingly also results in a larger degree of reduction in the sensitivity of detection of the partial discharge pulse current. For example, when the relative permeability is reduced by 10 times, the detection sensitivity is also approximately 1/10 of the original sensitivity; also, a 10-fold decrease in the number of winding turns causes a 10-fold decrease in the detection sensitivity.
For this purpose, an inductor L is added in the embodiment 1 13 and a capacitor C14. Specifically, inductance L 1 And two ends of the first branch circuit 13 are respectively connected to the first high-voltage conductor 5 and the second high-voltage conductor 6 to form a first branch circuit, and the first branch circuit is used as a power frequency test current circulation branch circuit. The capacitor C14 is connected between the first winding 9 and the first high-voltage conductor 5, and the branch where the capacitor C14 is located is a second branch which is used as a partial discharge detection branch.
Under the condition that the power frequency test current flows through the high-voltage conductor 3, the impedance of the capacitor C14 is large, and the inductance L 1 13 is small in impedance, and most of the power frequency test current flows from the first branch, so that the saturation of the annular magnetic core 12 caused by the larger power frequency test current is avoided; under the condition that high-frequency pulse current flows through the high-voltage conductor 3, the impedance of the capacitor C14 is small, and the inductance L 1 13 is large, a large part of the partial discharge pulse current can flow from the second branch, which is detected by the partial discharge pulse current sensing unit 8.
The equivalent circuit of the partial discharge pulse current sensing unit 8 according to this embodiment is shown in FIG. 4, L in FIG. 4 2 For the equivalent inductance of the first winding 9, I 0 For the current (including the industrial frequency test current and the high frequency pulse current) flowing through the high voltage conductor 3, I 1 For flowing through inductance L 1 13, I 2 For the current flowing through the first winding 9. Thus, the current I flowing through the first winding 9 can be obtained 2 The method comprises the following steps:
where ω is the angular frequency.
At low angular frequencies, e.g. at angular frequencies less than 1000, I 2 ≈ω 2 CL 1 I 0 By selecting a relatively small capacitance C14 and inductance L 1 13, the power frequency test current flowing through the first winding 9 can be made smaller; at higher frequencies, e.g. angular frequencies greater than 10000, I 2 ≈I 0 L 1 /(L 1 +L 2 ) By selecting an appropriate inductanceL 1 13 and the equivalent inductance L of the first winding 9 2 The high frequency current flowing through the first winding 9 is not reduced too much by the cooperation.
For example, c=0.1 μf, L is selected 1 ＝L 2 =20mh, then the calculation can be made for I 0 The current flowing in the first winding 9 at a different frequency when=1a (as shown in fig. 5), wherein for a power frequency test current with a frequency of 50Hz and a high frequency pulse current of 100kHz, the current I flowing in the first winding 9 2 0.2mA and 0.5A, respectively. It can be seen that the power frequency test current in the first winding 9 is well suppressed by more than 1000 times, whereas the high frequency pulse current is reduced by only about half.
The partial discharge pulse current sensing unit 8 provided in this embodiment has the following beneficial effects:
by adding a capacitor C14 and an inductance L 1 13 can better restrain the power frequency test current flowing through the first winding 9, avoid the saturation problem of the annular magnetic core 12 caused by larger power frequency test current, and simultaneously can not cause the great reduction of the detection sensitivity. Compared with the traditional mode of stringing detection impedance on the ground wire, the partial discharge pulse current sensing unit 8 is implanted into the high-voltage conductor 3 and stringed into the high-voltage loop, so that the detection of the partial discharge high potential is realized, the problem that the detection impedance cannot be stringed on the test sample ground wire in the GIL and GIS factory test and the field handover test can be solved, and the interference of the ground potential stringing can be eliminated, so that the measurement error of the partial discharge is reduced.
Third embodiment
The present embodiment provides a partial discharge pulse current detection method, which adopts the partial discharge pulse current sensing unit 8 provided in the first embodiment or the second embodiment, and the method includes:
first, the high-voltage conductor 3 of the gas-insulated device is disconnected to form a first high-voltage conductor 5, a second high-voltage conductor 6, and a high-voltage conductor cavity 7 connected between the first high-voltage conductor 5 and the second high-voltage conductor 6;
then, the partial discharge pulse current sensing unit 8 is installed in the high-voltage conductor cavity 7;
finally, the output end of the partial discharge pulse current sensing unit 8 is connected to an acquisition device to detect the partial discharge pulse current.
The partial discharge pulse current detection method provided by the embodiment has the beneficial effects that:
the method can effectively solve the saturation problem of the annular magnetic core 12 caused by the power frequency test current on the premise of ensuring the detection sensitivity as much as possible, and realizes the detection of the high-potential partial discharge pulse current with high sensitivity.
The present invention is not limited to the above embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (7)
1. A partial discharge pulse current sensing unit, characterized in that the partial discharge pulse current sensing unit is applied to a gas-insulated device comprising a first high-voltage conductor (5), a second high-voltage conductor (6) and a high-voltage conductor cavity (7) connected to the first high-voltage conductor (5), the partial discharge pulse current sensing unit being mounted within the high-voltage conductor cavity (7);
the partial discharge pulse current sensing unit comprises a first winding (9), a second winding (10) and a detection resistor R L (11) Annular magnetic core (12), inductance L 1 (13) And a capacitor C (14), wherein the first winding (9) and the second winding (10) are wound on the annular magnetic core (12), two ends of the first winding (9) are respectively connected to the first high-voltage conductor (5) and the second high-voltage conductor (6), and two ends of the second winding (10) are respectively connected with the detection resistor R L (11) The two ends of the partial discharge pulse current sensing unit are connected to form an output end of the partial discharge pulse current sensing unit, and the output end is used for being connected with an acquisition device;
the inductance L 1 (13) For connection to the first high voltage conductor (5) and to the second high voltage conductor, respectivelyThe body (6) forms a first branch circuit, the first branch circuit is used as a power frequency test current circulation branch circuit, the capacitor C (14) is connected between the first winding (9) and the first high-voltage conductor (5), the branch circuit where the capacitor C (14) is located is a second branch circuit, and the second branch circuit is used as a partial discharge detection branch circuit.
2. Partial discharge pulse current sensing unit according to claim 1, characterized in that the number of turns of the first winding (9) and the second winding (10) is above 30 turns.
3. Partial discharge pulse current sensing unit according to claim 1, characterized in that the relative permeability of the toroidal core (12) is larger than 10000.
4. A partial discharge pulse current detection method employing the partial discharge pulse current sensing unit of claim 1, the method comprising:
disconnecting the high voltage conductor (3) of the gas-insulated device, forming the first high voltage conductor (5), the second high voltage conductor (6) and a high voltage conductor cavity (7) connected to the first high voltage conductor (5);
installing the partial discharge pulse current sensing unit in the high-voltage conductor cavity (7);
and connecting the output end of the partial discharge pulse current sensing unit to the acquisition device.
5. The partial discharge pulse current detection method according to claim 4, characterized in that a current I flowing through the first winding (9) 2 The calculation formula of (2) is as follows:
wherein ω is angular frequency, L 2 For the equivalent inductance formed by the first winding (9), I 0 For the current flowing through the high-voltage conductor (3), I 1 For flowing through inductance L 1 (13) Is set in the above-described range).
6. The partial discharge pulse current detection method according to claim 4, characterized in that the current I flowing through the first winding (9) when the angular frequency ω of the second winding (10) is smaller than 1000 2 The calculation formula of (2) is as follows:
I 2 ≈ω 2 CL 1 I 0
wherein I is 0 Is a current flowing through the high voltage conductor (3).
7. The partial discharge pulse current detection method according to claim 4, wherein the current I flowing through the first winding (9) when the angular frequency ω of the second winding (10) is greater than 10000 2 The calculation formula of (2) is as follows:
I 2 ≈I 0 L 1 /(L 1 +L 2 )
wherein L is 2 For the equivalent inductance formed by the first winding (9), I 0 Is a current flowing through the high voltage conductor (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202310994162.0A CN117031222A (en) | 2023-08-08 | 2023-08-08 | Partial discharge pulse current sensing unit and detection method thereof |
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| CN202310994162.0A CN117031222A (en) | 2023-08-08 | 2023-08-08 | Partial discharge pulse current sensing unit and detection method thereof |
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| CN202310994162.0A Pending CN117031222A (en) | 2023-08-08 | 2023-08-08 | Partial discharge pulse current sensing unit and detection method thereof |
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