CN113945766A - Electromagnetic compatibility testing method for transformer embedded sensor - Google Patents
Electromagnetic compatibility testing method for transformer embedded sensor Download PDFInfo
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- CN113945766A CN113945766A CN202111132409.5A CN202111132409A CN113945766A CN 113945766 A CN113945766 A CN 113945766A CN 202111132409 A CN202111132409 A CN 202111132409A CN 113945766 A CN113945766 A CN 113945766A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
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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
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Abstract
The invention discloses an electromagnetic compatibility testing method of a transformer embedded sensor, and belongs to the technical field of power equipment state detection. The sensor to be tested is placed in the sensor accommodating device by sealing and filling the insulating medium in the insulated sensor accommodating device, so that the actual working scene of the sensor can be better simulated; according to the electromagnetic field characteristics in the transformer, power frequency magnetic field immunity test, surge immunity test, electric fast transient pulse group immunity test and power frequency electric field and pulse electric field immunity test are carried out on the transformer embedded sensor, so that the electromagnetic compatibility of the sensor is tested, and whether the protection of the sensor meets the requirements is inspected. The invention can better simulate the actual working scene of the sensor, carry out relevant electromagnetic compatibility tests on the transformer embedded sensor according to the electromagnetic field characteristics in the transformer, and meet the actual requirements.
Description
Technical Field
The invention belongs to the technical field of power equipment state detection, and particularly relates to an electromagnetic compatibility testing method of an embedded sensor of a transformer.
Background
In recent years, with the deep revolution of energy structures and production modes in the world, many countries in the world are beginning to build smart power grids, and the most intuitive embodiment is the intelligent transformer substation which is characterized by intelligent automation, integration and digital information and is in the international leading position. The intelligent substation is intelligent because a large number of sensors are adopted and assisted by corresponding algorithms. However, with the extensive use of sensors, the problem of electromagnetic compatibility of sensors is gradually emerging, especially for sensors inside electrical equipment. Therefore, the electromagnetic compatibility problem of the sensor in the transformer is solved, and the method has very important significance for the construction of a strong smart power grid.
The amplitude of an electromagnetic field in the transformer is high, distribution is complex, calculation shows that the maximum value of the electric field in the 10kV distribution transformer can reach 21.2kV/cm, the maximum electric field is located at the end part of a winding, the maximum value of the magnetic field can reach 2.87T, the maximum electric field is distributed at the corner of an iron core window, and a sensor is located in the electromagnetic environment and is prone to failure. Therefore, before the sensor in the transformer is installed, the electromagnetic compatibility of the sensor needs to be tested, so that whether the protection of the sensor meets the requirements or not is examined.
The existing electromagnetic compatibility test project mainly comprises an electrostatic discharge immunity test, a radio frequency electromagnetic field radiation immunity test, an electric fast transient pulse group immunity test, a surge immunity test, a radio frequency field induced conduction disturbance immunity test, a power frequency magnetic field immunity test, a pulse magnetic field immunity test and the like, and only a power frequency magnetic field immunity test, a power frequency electric field immunity test, a pulse electric field immunity test, a surge immunity test and an electric fast transient pulse group test need to be carried out on an internal sensor of the transformer by considering the characteristics of an internal electromagnetic field of the transformer. The tests specified by the GB/T17626 series standards are all universal tests, do not consider such extreme scenes in the transformer, and are far less severe than electromagnetic fields in the transformer. In addition, the current electromagnetic compatibility test is directly carried out in air, and the medium of the sensor in actual use is not considered, for example, the sensor inside the oil-immersed transformer is immersed in transformer oil.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a method for testing the electromagnetic compatibility of the transformer embedded sensor, which can better simulate the actual working scene of the sensor, carry out related electromagnetic compatibility tests on the transformer embedded sensor according to the characteristics of an electromagnetic field in a transformer, and meet the actual requirements.
The invention is realized by the following technical scheme:
a method for testing electromagnetic compatibility of a transformer embedded sensor comprises the following steps:
placing a sensor to be tested in an insulated sensor accommodating device, wherein an insulating medium is hermetically filled in the sensor accommodating device, leading a power line and a signal line of the sensor to be tested out of the sensor accommodating device, connecting the power line to a sensor power supply, connecting the signal line to a signal processing and analyzing system, and respectively testing:
testing the noise immunity of the power frequency magnetic field: placing the accommodating device of the sensor to be tested in the center of a rectangular coil, connecting the rectangular coil with a large current generator, starting a power supply of the sensor, and recording and outputting by a signal processing and analyzing system; starting a large current generator, generating a power frequency magnetic field in the rectangular coil, recording an output signal of the sensor to be tested by a signal processing and analyzing system, and analyzing the power frequency magnetic field immunity of the sensor to be tested;
and (3) testing the surge immunity: starting a sensor power supply, and measuring the output of a sensor to be measured when no interference is applied; applying surge interference between the positive electrode and the negative electrode of a power supply of the sensor, between the positive electrode and the negative electrode of the sensor to be tested and a grounding wire, and between the input of the sensor to be tested and the grounding wire respectively, recording an output signal of the sensor to be tested by a signal processing and analyzing system, and analyzing the surge immunity of the sensor to be tested;
electric fast transient burst immunity test: starting a sensor power supply, and measuring the output of a sensor to be measured when no interference is applied; applying electric fast transient pulse group interference between the anode and the cathode of the sensor to be tested and the grounding wire and between the input of the sensor to be tested and the grounding wire respectively, recording an output signal of the sensor to be tested by a signal processing and analyzing system, and analyzing the electric fast transient pulse group immunity of the sensor to be tested;
testing the noise immunity of the power frequency electric field and the pulse electric field: starting a sensor power supply, and measuring the output of the sensor when no interference is applied; and respectively applying power frequency voltage and pulse voltage to two ends of the sensor to be detected to generate a power frequency electric field and a pulse electric field, recording an output signal of the sensor to be detected by a signal processing and analyzing system, and analyzing the power frequency electric field immunity and the pulse electric field immunity of the sensor to be detected.
Preferably, the sensor accommodating device comprises an insulating shell, an upper electrode rod, a lower electrode plate, an insulating tray and an upper electrode plate; the insulating shell comprises a side wall, an upper end face and a lower end face, the upper end face and the lower end face are connected with two ends of the side wall, a medium cavity used for filling insulating media is hermetically enclosed in the insulating shell, and the lower electrode plate, the insulating tray and the upper electrode plate are arranged in the medium cavity; the insulating tray is connected with the inner wall of the insulating shell through a plurality of insulating support columns; the lower end face of the insulating shell is provided with a medium outlet and a plurality of wiring leading-out ends, the lower electrode plate is connected with the lower end face of the insulating shell through a lower electrode rod, and the lower electrode rod extends out of the lower end face of the insulating shell; a medium inlet is arranged on the upper end face of the insulating shell, the upper electrode plate is connected with the upper end face of the insulating shell through an upper electrode rod, and the upper electrode rod extends out of the upper end face of the insulating shell; the insulating tray is arranged between the lower electrode plate and the upper electrode plate.
Further preferably, the side walls of the insulating housing are detachably connected with the upper end face and the lower end face by nylon bolts, respectively.
Further preferably, a sealing ring is respectively arranged between the upper end face and the side wall and between the lower end face and the side wall.
Further preferably, the edge of the insulating tray is provided with a rib.
Further preferably, a plurality of insulating supporting columns are uniformly distributed on the lower surface of the insulating tray.
Further preferably, a transparent liquid level window is arranged on the side wall of the insulating shell.
Preferably, each test is performed in a class a shielded room.
Preferably, the signal processing and analyzing system comprises an oscilloscope and an upper computer, wherein the input end of the oscilloscope is connected with a signal wire of the sensor to be detected, and the output end of the oscilloscope is connected with the upper computer.
Preferably, the coil for power frequency magnetic field immunity test is 1m by 1 m.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the electromagnetic compatibility testing method of the transformer embedded sensor, the insulating medium is hermetically filled in the insulating sensor accommodating device, and the sensor to be tested is placed in the sensor accommodating device, so that the actual working scene of the sensor can be better simulated; according to the electromagnetic field characteristics in the transformer, power frequency magnetic field immunity test, surge immunity test, electric fast transient pulse group immunity test and power frequency electric field and pulse electric field immunity test are carried out on the transformer embedded sensor, so that the electromagnetic compatibility of the sensor is tested, and whether the protection of the sensor meets the requirements is inspected.
Further, the structure of the sensor accommodating device can meet the requirements of insulating and sealing the insulating medium.
Furthermore, the side wall of the insulating shell is detachably connected with the upper end face and the lower end face through nylon bolts, so that the inside of the sensor accommodating device is convenient to maintain.
Furthermore, the sealing rings are respectively arranged between the upper end face and the side wall and between the lower end face and the side wall, so that the sealing performance can be further improved.
Furthermore, the edge of the insulating tray is provided with a flange, so that the sensor to be detected can be prevented from shifting when a liquid insulating medium is injected.
Furthermore, a transparent liquid level window is arranged on the side wall of the insulating shell, so that the filling condition of the internal insulating medium can be observed conveniently.
Drawings
FIG. 1 is a schematic diagram of a method for testing the noise immunity of a power frequency magnetic field of a sensor inside a transformer;
FIG. 2 is a schematic diagram of a method for testing surge immunity of a sensor inside a transformer;
FIG. 3 is a schematic diagram of a method for measuring immunity to electrical fast transient bursts of a sensor inside a transformer;
FIG. 4 is a schematic diagram of a method for testing the noise immunity of a power frequency electric field and a pulse electric field of a sensor inside a transformer;
FIG. 5 is a schematic view of the overall structure of the sensor receptacle with the top surface facing upward;
FIG. 6 is a schematic view of the entire structure of the sensor receptacle with the bottom surface facing upward;
FIG. 7 is a schematic view of the structure inside the lower half of the sensor housing;
fig. 8 is a schematic view of the structure inside the upper half of the sensor housing device.
In the figure: 1 is an insulating shell, 2 is a nylon bolt, 3 is a medium inlet, 4 is an upper electrode bar, 5 is a lower electrode bar, 6 is a sensor wiring leading-out end, 7 is a medium outlet, 8 is a sealing ring, 9 is a lower electrode plate, 10 is an insulating tray, 11 is an insulating support and 12 is an upper electrode plate.
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are given by way of illustration and not by way of limitation.
The invention discloses an electromagnetic compatibility testing method of a transformer embedded sensor, which comprises the following steps:
placing the sensor to be tested in an insulated sensor accommodating device, wherein an insulating medium is filled in the sensor accommodating device in a sealing manner, leading out a power line and a signal line of the sensor to be tested from the sensor accommodating device, connecting the power line to a sensor power supply, adopting an EUT power supply by the sensor power supply, connecting the signal line to a signal processing and analyzing system, and respectively testing:
testing the noise immunity of the power frequency magnetic field: as shown in fig. 1, the sensor accommodating device to be measured is placed in the center of a rectangular coil, the rectangular coil is connected with a large current generator, the coil is 1m by 1m, the power supply of the sensor is started, and a signal processing and analyzing system records and outputs the coil; starting a large current generator, generating a power frequency magnetic field in the rectangular coil, recording an output signal of the sensor to be tested by a signal processing and analyzing system, and analyzing the power frequency magnetic field immunity of the sensor to be tested;
and (3) testing the surge immunity: as shown in fig. 2, the power supply of the sensor is turned on, and the output of the sensor to be measured when no interference is applied is measured; applying surge interference between the positive electrode and the negative electrode of a power supply of the sensor, between the positive electrode and the negative electrode of the sensor to be tested and a grounding wire, and between the input of the sensor to be tested and the grounding wire respectively, recording an output signal of the sensor to be tested by a signal processing and analyzing system, and analyzing the surge immunity of the sensor to be tested;
electric fast transient burst immunity test: as shown in fig. 3, the sensor power is turned on, and the output of the sensor to be measured is measured when no interference is applied; applying electric fast transient pulse group interference between the anode and the cathode of the sensor to be tested and the grounding wire and between the input of the sensor to be tested and the grounding wire respectively, recording an output signal of the sensor to be tested by a signal processing and analyzing system, and analyzing the electric fast transient pulse group immunity of the sensor to be tested;
testing the noise immunity of the power frequency electric field and the pulse electric field: turning on the sensor power, as in fig. 4, the sensor output is measured when no interference is applied; and respectively applying power frequency voltage and pulse voltage to two ends of the sensor to be detected to generate a power frequency electric field and a pulse electric field, recording an output signal of the sensor to be detected by a signal processing and analyzing system, and analyzing the power frequency electric field immunity and the pulse electric field immunity of the sensor to be detected.
The signal processing and analyzing system comprises an oscilloscope and an upper computer, wherein the input end of the oscilloscope is connected with a signal wire of the sensor to be detected, and the output end of the oscilloscope is connected with the upper computer.
In a preferred embodiment of the present invention, the tests are performed in a class A shielded room.
As shown in fig. 5 to 8, the sensor housing device includes an insulating case 1, an upper electrode rod 4, a lower electrode rod 5, a lower electrode plate 9, an insulating tray 10, and an upper electrode plate 12; the insulating shell 1 comprises a side wall, an upper end face and a lower end face, wherein the upper end face and the lower end face are connected with two ends of the side wall, a medium cavity for filling insulating media is hermetically enclosed in the insulating shell 1, and the lower electrode plate 9, the insulating tray 10 and the upper electrode plate 12 are all arranged in the medium cavity; the insulating tray 10 is connected with the inner wall of the insulating shell 1 through a plurality of insulating support columns 11; a medium outlet 7 and a plurality of wiring leading-out terminals 6 are arranged on the lower end surface of the insulating shell 1, a lower electrode plate 9 is connected with the lower end surface of the insulating shell 1 through a lower electrode bar 5, and the lower electrode bar 5 extends out of the lower end surface of the insulating shell 1; a medium inlet 3 is arranged on the upper end face of the insulating shell 1, an upper electrode plate 12 is connected with the upper end face of the insulating shell 1 through an upper electrode rod 4, and the upper electrode rod 4 extends out of the upper end face of the insulating shell 1; an insulating tray 10 is provided between the lower electrode plate 9 and the upper electrode plate 12.
In a preferred embodiment of the present invention, the side walls of the insulating housing 1 are detachably connected to the upper and lower end surfaces by nylon bolts 2, respectively.
In a preferred embodiment of the invention, sealing rings 8 are respectively arranged between the upper end surface and the side wall and between the lower end surface and the side wall.
In a preferred embodiment of the invention, the edge of the insulating tray 10 is provided with a rib.
In a preferred embodiment of the present invention, a plurality of insulating support posts 11 are uniformly distributed on the lower surface of the insulating tray 10.
In a preferred embodiment of the invention, the side walls of the insulating housing 1 are provided with transparent liquid level windows.
The invention is further illustrated below in a specific embodiment:
the distribution transformer of this embodiment is oil-immersed transformer, confirms transformer internal sensor electromagnetic compatibility test item according to the characteristics of the inside electromagnetic field of transformer: the method comprises the following steps of power frequency magnetic field immunity testing, surge immunity testing, electric fast transient pulse group immunity testing, power frequency electric field immunity testing and pulse electric field immunity testing. During testing, the sensor is placed on the insulating tray 10 in the sensor accommodating device, and the insulating shell 1 is sealed. The actual working environment of the sensor is simulated by injecting transformer oil into the medium cavity of the insulating shell 1 through the medium inlet 3.
Testing the noise immunity of the power frequency magnetic field: firstly, a sensor to be measured is placed in a medium cavity, and a power line and a signal line of the sensor are led out through a wiring leading-out terminal 6 at the bottom of an insulating shell 1. Then the insulating shell 1 is placed in the center of the 1m by 1m rectangular coil, the power line of the sensor is connected to the power supply of the sensor, and the signal line is connected to an oscilloscope. And finally, testing in a shielding room, starting a power supply of the sensor and a power supply of the oscilloscope, recording output, then starting the large current generator to generate a power frequency magnetic field, recording output, and analyzing the immunity of the power frequency magnetic field of the sensor.
And (3) testing the surge immunity: firstly, a sensor to be measured is placed in a medium cavity, and a power line and a signal line of the sensor are led out through a wiring leading-out terminal 6 at the bottom of an insulating shell 1. Then, a sensor power supply and an oscilloscope were connected, and the sensor output was measured in a shielded room without applying interference. And finally, applying surge interference between the positive electrode and the negative electrode of the power supply of the sensor, between the positive electrode and the negative electrode of the sensor and the grounding wire, and between the input of the sensor and the grounding wire, respectively, recording the output of the sensor, and analyzing the surge immunity of the sensor.
Electric fast transient burst immunity test: firstly, a sensor to be measured is placed in a medium cavity, and a power line and a signal line of the sensor are led out through a wiring leading-out terminal 6 at the bottom of an insulating shell 1. Then, a sensor power supply and an oscilloscope were connected, and the sensor output was measured in a shielded room without applying interference. And finally, applying electric fast transient pulse group interference between the positive electrode and the negative electrode of the sensor and the grounding wire and between the input of the sensor and the grounding wire respectively, recording the output of the sensor, and analyzing the immunity of the electric fast transient pulse group of the sensor.
Testing the noise immunity of the power frequency electric field and the pulse electric field: firstly, a sensor to be measured is placed in a medium cavity, and a power line and a signal line of the sensor are led out through a wiring leading-out terminal 6 at the bottom of an insulating shell 1. Then, a sensor power supply and an oscilloscope were connected, and the sensor output was measured in a shielded room without applying interference. And finally, applying power frequency voltage and pulse voltage between the upper electrode plate 12 and the lower electrode plate 9 respectively to generate a power frequency electric field and a pulse electric field, recording the output of the sensor, and analyzing the noise immunity of the sensor.
It should be noted that the above description is only a part of the embodiments of the present invention, and equivalent changes made to the system described in the present invention are included in the protection scope of the present invention. Persons skilled in the art to which this invention pertains may substitute similar alternatives for the specific embodiments described, all without departing from the scope of the invention as defined by the claims.
Claims (10)
1. A method for testing electromagnetic compatibility of a transformer embedded sensor is characterized by comprising the following steps:
placing a sensor to be tested in an insulated sensor accommodating device, wherein an insulating medium is hermetically filled in the sensor accommodating device, leading a power line and a signal line of the sensor to be tested out of the sensor accommodating device, connecting the power line to a sensor power supply, connecting the signal line to a signal processing and analyzing system, and respectively testing:
testing the noise immunity of the power frequency magnetic field: placing the accommodating device of the sensor to be tested in the center of a rectangular coil, connecting the rectangular coil with a large current generator, starting a power supply of the sensor, and recording and outputting by a signal processing and analyzing system; starting a large current generator, generating a power frequency magnetic field in the rectangular coil, recording an output signal of the sensor to be tested by a signal processing and analyzing system, and analyzing the power frequency magnetic field immunity of the sensor to be tested;
and (3) testing the surge immunity: starting a sensor power supply, and measuring the output of a sensor to be measured when no interference is applied; applying surge interference between the positive electrode and the negative electrode of a power supply of the sensor, between the positive electrode and the negative electrode of the sensor to be tested and a grounding wire, and between the input of the sensor to be tested and the grounding wire respectively, recording an output signal of the sensor to be tested by a signal processing and analyzing system, and analyzing the surge immunity of the sensor to be tested;
electric fast transient burst immunity test: starting a sensor power supply, and measuring the output of a sensor to be measured when no interference is applied; applying electric fast transient pulse group interference between the anode and the cathode of the sensor to be tested and the grounding wire and between the input of the sensor to be tested and the grounding wire respectively, recording an output signal of the sensor to be tested by a signal processing and analyzing system, and analyzing the electric fast transient pulse group immunity of the sensor to be tested;
testing the noise immunity of the power frequency electric field and the pulse electric field: starting a sensor power supply, and measuring the output of the sensor when no interference is applied; and respectively applying power frequency voltage and pulse voltage to two ends of the sensor to be detected to generate a power frequency electric field and a pulse electric field, recording an output signal of the sensor to be detected by a signal processing and analyzing system, and analyzing the power frequency electric field immunity and the pulse electric field immunity of the sensor to be detected.
2. The method for testing the electromagnetic compatibility of the in-line sensor of the transformer according to claim 1, wherein the sensor accommodating device comprises an insulating shell (1), an upper electrode rod (4), a lower electrode rod (5), a lower electrode plate (9), an insulating tray (10) and an upper electrode plate (12); the insulating shell (1) comprises a side wall, an upper end face and a lower end face, wherein the upper end face and the lower end face are connected with two ends of the side wall, a medium cavity used for filling insulating media is hermetically enclosed in the insulating shell (1), and the lower electrode plate (9), the insulating tray (10) and the upper electrode plate (12) are all arranged in the medium cavity; the insulating tray (10) is connected with the inner wall of the insulating shell (1) through a plurality of insulating support columns (11); a medium outlet (7) and a plurality of wiring leading-out terminals (6) are arranged on the lower end surface of the insulating shell (1), the lower electrode plate (9) is connected with the lower end surface of the insulating shell (1) through a lower electrode bar (5), and the lower electrode bar (5) extends out of the lower end surface of the insulating shell (1); a medium inlet (3) is arranged on the upper end face of the insulating shell (1), an upper electrode plate (12) is connected with the upper end face of the insulating shell (1) through an upper electrode rod (4), and the upper electrode rod (4) extends out of the upper end face of the insulating shell (1); the insulating tray (10) is arranged between the lower electrode plate (9) and the upper electrode plate (12).
3. The method for testing the electromagnetic compatibility of the in-line sensor of the transformer according to claim 2, wherein the side wall of the insulating housing (1) is detachably connected to the upper end surface and the lower end surface by nylon bolts (2).
4. The method for testing the electromagnetic compatibility of the transformer embedded sensor according to claim 2, wherein a sealing ring (8) is respectively arranged between the upper end surface and the side wall and between the lower end surface and the side wall.
5. The method for testing the electromagnetic compatibility of the in-line sensor of the transformer as claimed in claim 2, wherein the edge of the insulating tray (10) is provided with a rib.
6. The method for testing the electromagnetic compatibility of the transformer embedded sensor according to claim 2, wherein a plurality of insulating support columns (11) are uniformly distributed on the lower surface of the insulating tray (10).
7. The method for testing the electromagnetic compatibility of the transformer embedded sensor according to claim 2, wherein a transparent liquid level window is arranged on the side wall of the insulating shell (1).
8. The method for testing the electromagnetic compatibility of the in-line sensor of the transformer as claimed in claim 1, wherein each test is performed in a class a shielded room.
9. The method for testing the electromagnetic compatibility of the transformer embedded sensor according to claim 1, wherein the signal processing and analyzing system comprises an oscilloscope and an upper computer, an input end of the oscilloscope is connected with a signal line of the sensor to be tested, and an output end of the oscilloscope is connected with the upper computer.
10. The method for testing the electromagnetic compatibility of the transformer embedded sensor according to claim 1, wherein the coil used for the power frequency magnetic field immunity test is 1m x 1 m.
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