CN115453290A - Transformer bushing online monitoring system and method - Google Patents
Transformer bushing online monitoring system and method Download PDFInfo
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- CN115453290A CN115453290A CN202211160085.0A CN202211160085A CN115453290A CN 115453290 A CN115453290 A CN 115453290A CN 202211160085 A CN202211160085 A CN 202211160085A CN 115453290 A CN115453290 A CN 115453290A
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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
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Abstract
The application provides a transformer bushing on-line monitoring system and method, and the system includes main transformer bushing, end screen, leakage current acquisition unit, protection circuit board, sleeve pipe insulation monitoring facilities and voltage acquisition unit, wherein: one end of the end screen is connected with the main transformer bushing through a first cable, and the other end of the end screen is grounded through an end screen grounding cable; the leakage current acquisition unit is arranged on the end screen grounding cable; one end of the protection circuit board is connected in parallel to the end screen through a second cable and an end screen grounding cable, and the other end of the protection circuit board is grounded through a third cable; the sleeve insulation monitoring equipment is connected with the leakage current acquisition unit through a first shielding cable and connected with the voltage acquisition unit through a second shielding cable. Therefore, a casing medium loss tangent angle of the main transformer casing is obtained by collecting current, frequency, voltage and phase angle in the main transformer casing; and comparing the size of the medium loss tangent angle of the sleeve with the preset judgment index, so that whether the insulation state of the main transformer sleeve is normal or not can be judged under the operating voltage.
Description
Technical Field
The application relates to the technical field of power equipment, in particular to a transformer bushing online monitoring system and a transformer bushing online monitoring method.
Background
The transformer bushing is a main insulation device outside the transformer box, and outgoing lines of a transformer winding must penetrate through the transformer bushing, so that the outgoing lines are insulated from one another and from the transformer shell, and the outgoing lines are fixed. The bushing is one of important parts of the transformer, and the proportion of bushing faults in the transformer faults is up to 14% according to transformer fault data statistics, so that online monitoring of the insulation state of the high-voltage bushing has a substantial significance on reliable operation of the transformer.
The preventive test of the transformer bushing can be carried out only in a power failure state, the voltage of the preventive test is low, the period is long, the workload is large, and the condition of overdue or test omission possibly occurs in the test process.
Taking the dielectric loss of the capacitive bushing as an example: the casing pipe with the voltage of 220kV and above is subjected to a preventive test for three years, and the casing pipe with the voltage of 110kV and below is subjected to a preventive test for six years. However, the deterioration rate of insulation is not uniform and has latency. Even if the power equipment is qualified through the pre-test, the power equipment can break down soon after being put into operation, and power failure needs to be performed again to perform the preventive test. That is, the transformer bushing cannot be monitored in real time at the operating voltage by preventive testing.
Therefore, the online monitoring equipment provided by the invention can be used for monitoring in real time under the operation voltage, does not need power failure of the equipment during monitoring, improves the power supply reliability, saves human resources and provides a reference basis for equipment state maintenance.
Disclosure of Invention
The application provides a transformer bushing on-line monitoring system and a transformer bushing on-line monitoring method, which can be used for solving the technical problem that the existing preventive test cannot monitor the transformer bushing in real time under the operation voltage.
In a first aspect, the present application provides a transformer bushing on-line monitoring system, on-line monitoring system includes main transformer bushing, end screen, leakage current acquisition unit, protection circuit board, bushing insulation monitoring equipment and voltage acquisition unit, wherein:
one end of the end screen is connected with the main transformer bushing through a first cable, and the other end of the end screen is grounded through an end screen grounding cable;
the leakage current acquisition unit is arranged on the end screen grounding cable;
one end of the protection circuit board is connected in parallel to the end screen through a second cable and the end screen grounding cable, and the other end of the protection circuit board is grounded through a third cable;
the sleeve insulation monitoring equipment is connected with the leakage current acquisition unit through a first shielding cable and connected with the voltage acquisition unit through a second shielding cable.
In one implementation manner of the first aspect, the leakage current collecting unit is a casing leakage current sensor.
In one implementation form of the first aspect, the protection circuit board is a circular ring type.
In an implementation manner of the first aspect, the protection circuit board includes a pin, a component, and a housing, where the pin and the component are disposed on the housing.
In an implementation manner of the first aspect, the protection circuit board is connected to the end of the end screen through the leading-out pin.
In one implementation form of the first aspect, the protection circuit board is grounded through the housing.
In an implementation manner of the first aspect, the pin, the component, and the housing are sequentially connected in series.
In one implementation form of the first aspect, the components include a gas discharge tube, a varistor, and a transient suppression diode connected in parallel.
In one implementation manner of the first aspect, an MB NAND FLASH memory is provided in the bushing insulation monitoring device.
In a second aspect, the present application provides a transformer bushing online monitoring method, where the monitoring method is applied to the first aspect and various implementation manners of a transformer bushing online monitoring system, where the monitoring system includes a main transformer bushing, a tap screen, a leakage current collecting unit, a protection circuit board, a bushing insulation monitoring device, and a voltage collecting unit, where:
one end of the end screen is connected with the main transformer bushing through a first cable, and the other end of the end screen is grounded through an end screen grounding cable;
the leakage current acquisition unit is arranged on the end screen grounding cable;
one end of the protection circuit board is connected in parallel to the end screen through a second cable and the end screen grounding cable, and the other end of the protection circuit board is grounded through a third cable;
the sleeve insulation monitoring equipment is connected with the leakage current acquisition unit through a first shielded cable and connected with the voltage acquisition unit through a second shielded cable;
the online detection method comprises the following steps:
collecting current in the main transformer bushing through the leakage current collecting unit, and transmitting the current to the bushing insulation monitoring equipment;
acquiring a PT reference signal through the voltage acquisition unit, and transmitting the PT reference signal to the sleeve insulation monitoring equipment; wherein the PT reference signals include frequency, voltage and phase angle in the main transformer bushing;
the sleeve insulation monitoring equipment obtains a sleeve medium loss tangent angle of the main transformer sleeve according to the current, the frequency, the voltage and the phase angle;
and comparing the tangent angle of the dielectric loss of the sleeve with the preset judgment index to judge whether the insulation state of the main transformer sleeve is normal or not.
According to the technical scheme, the application provides a transformer bushing on-line monitoring system and method, the on-line monitoring system includes main transformer bushing, end screen, leakage current acquisition unit, protection circuit board, bushing insulation monitoring equipment and voltage acquisition unit, wherein: one end of the end screen is connected with the main transformer bushing through a first cable, and the other end of the end screen is grounded through an end screen grounding cable; the leakage current acquisition unit is arranged on the end screen grounding cable; one end of the protection circuit board is connected in parallel to the end screen through a second cable and the end screen grounding cable, and the other end of the protection circuit board is grounded through a third cable; the sleeve insulation monitoring equipment is connected with the leakage current acquisition unit through a first shielded cable and connected with the voltage acquisition unit through a second shielded cable.
In this way, the leakage current collecting unit is used for collecting the current in the main transformer bushing and transmitting the current to the bushing insulation monitoring equipment; acquiring a PT reference signal through the voltage acquisition unit, and transmitting the PT reference signal to the sleeve insulation monitoring equipment; wherein the PT reference signals include frequency, voltage and phase angle in the main transformer bushing; the sleeve insulation monitoring equipment obtains a sleeve medium loss tangent angle of the main transformer sleeve according to the current, the frequency, the voltage and the phase angle; and comparing the size of the tangent angle of the dielectric loss of the sleeve with a preset judgment index, and judging whether the insulation state of the main transformer sleeve is normal or not under the operating voltage.
Drawings
In order to more clearly describe the technical solution of the present application, the drawings required to be used in the embodiments will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an online transformer bushing monitoring system provided in the present application;
fig. 2 is a schematic structural diagram of a protection circuit board of an online transformer bushing monitoring system provided in the present application;
fig. 3 is a schematic circuit connection diagram of a protection circuit board of an online transformer bushing monitoring system provided in the present application;
fig. 4 is a schematic diagram of a butt joint installation structure of a protection circuit board of the transformer bushing online monitoring system provided by the present application.
In fig. 1 to 2:
100 is a main transformer bushing, 200 is a tail screen, 210 is a first cable, 220 is a tail screen grounding cable, 300 is a leakage current acquisition unit, 400 is a protective circuit board, 410 is a second cable, 420 is a third cable, 430 is a leading-out pin, 440 is a component, 441 is a gas discharge tube, 442 is a piezoresistor, 443 is a transient suppression diode, 450 is a shell, 460 is an installation cylinder, 500 is bushing insulation monitoring equipment, 510 is a first shielding cable, 520 is a second shielding cable, and 600 is a voltage acquisition unit.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, the following detailed description of the embodiments of the present application will be made with reference to the accompanying drawings.
The terminology used in the following examples is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of this application and the appended claims, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, such as "one or more", unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of the present application, "at least one", "one or more" means one, two or more, "a plurality" means two or more. The term "and/or" is used to describe the association relationship of the associated objects, and means that there may be three relationships; for example, a and/or B, may represent: a exists singly, A and B exist simultaneously, and B exists singly, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless otherwise specifically stated.
The first embodiment of the present application discloses an online monitoring system for transformer bushings, which is specifically described below with reference to the accompanying drawings.
Referring to fig. 1, a schematic structural diagram of an online transformer bushing monitoring system provided by the present application is shown;
as shown in fig. 1, the transformer bushing online monitoring system provided in the first embodiment of the present application includes a main transformer bushing 100, a tap 200, a leakage current collecting unit 300, a protection circuit board 400, a bushing insulation monitoring device 500, and a voltage collecting unit 600, wherein:
one end of the end screen 200 is connected with the main transformer bushing 100 through a first cable 210, and the other end is grounded through an end screen grounding cable 220;
the leakage current collecting unit 300 is disposed on the end screen grounding cable 220;
in the embodiment of the present application, the leakage current collecting unit 300 is a casing leakage current sensor, and may also be other devices capable of collecting leakage current.
One end of the protection circuit board 400 is connected in parallel to the end screen 200 through a second cable 410 and the end screen grounding cable 220, and the other end is grounded through a third cable 420;
referring to fig. 2, a schematic structural diagram of a protection circuit board of an online transformer bushing monitoring system provided in the present application is shown;
as shown in fig. 2, in the embodiment of the present invention, the protection circuit board 400 is a circular ring.
The protection circuit board 400 includes an extraction pin 430, a component 440, and a housing 450, wherein the extraction pin 430 and the component 440 are disposed on the housing 450.
The protection circuit board 400 is connected to the end of the end screen 200 through the pin 430.
The protection circuit board 400 is grounded through the case 450.
The protection circuit board 400 is connected to the end screen 200 in parallel with the sleeve end screen cable, when the end screen grounding cable 220 is grounded well or not damaged, the component 440 is not conductive and has good insulation, and the end screen grounding current flows through the end screen grounding cable 220 to the ground. When the end screen grounding cable 220 is damaged or the contact is poor, the current cannot normally flow to the ground from the end screen grounding cable 220, at the moment, the voltage on the end screen 200 is increased, the components 440 are conducted in a grading mode according to the voltage level, the grounding current flows back to the ground again, and therefore accidents caused by the fact that the end screen grounding cable is opened are prevented.
Referring to fig. 3, a schematic circuit connection diagram of a protection circuit board of an online transformer bushing monitoring system provided in the present application is shown;
as can be seen from fig. 3, in the embodiment of the present application, the outgoing pin 430, the component 440, and the housing 450 are electrically connected in series in this order.
The component 440 includes a gas discharge tube 441, a varistor 442, and a transient suppression diode 443 connected in parallel.
In fig. 3, the gas discharge tube 441 is represented by G1, the varistor 442 is represented by R1, and the transient suppression diode 443 is represented by D1.
In the embodiment of the application, G1 belongs to a gas discharge tube, and the working principle of the gas discharge tube is that when a certain voltage is applied between two poles of the discharge tube, an uneven electric field is generated between the poles, under the action of the electric field, gas in the tube starts to dissociate, when the applied voltage is increased to enable the field intensity between the poles to exceed the insulation strength of the gas, discharge is broken down through a gap between the two poles, the original insulation state is converted into a conduction state, the voltage between the two poles of the discharge tube is maintained at the residual voltage level determined by a discharge arc channel after the conduction, the residual voltage is generally very low, and therefore electronic equipment connected with the discharge tube in parallel is prevented from being damaged by overvoltage.
R1 belongs to a voltage dependent resistor, is a resistor device with nonlinear volt-ampere characteristics, is mainly used for clamping voltage when a circuit bears overvoltage, absorbs redundant current to protect a sensitive device, and when the voltage applied to the voltage dependent resistor is lower than the threshold value of the voltage dependent resistor, the current flowing through the voltage dependent resistor is extremely small, which is equivalent to a resistor with infinite resistance. That is, when the voltage applied to it is below its threshold, it behaves as a switch in the off state; when the voltage across the varistor exceeds its threshold, the current flowing through it increases sharply, corresponding to a resistance of infinitesimal magnitude. That is, when the voltage applied to it is above its threshold, it behaves as a closed-state switch.
D1 belongs to TVS diodes, also known as transient suppression diodes, and is a commonly used new type of high-efficiency circuit protection device with extremely fast response time (sub-nanosecond level) and relatively high surge absorption capability. When the two ends of the TVS are subjected to transient high-energy impact, the TVS can change the impedance value between the two ends from high impedance to low impedance at a very high speed so as to absorb a transient large current and clamp the voltage between the two ends of the TVS at a preset value, thereby protecting the following circuit elements from the impact of transient high-voltage spike pulse.
The bushing insulation monitoring device 500 is connected to the leakage current collecting unit 300 through a first shielded cable 510, and is connected to the voltage collecting unit 600 through a second shielded cable 520.
In the embodiment of the present application, a 64MB NAND FLASH memory is provided in the bushing insulation monitoring device 500.
Specifically, the sleeve insulation monitoring system analyzes the insulation of the transformer sleeve, and comprises the following basic parameters: dielectric loss, end screen current, equivalent capacitance.
The sleeve insulation monitoring system can store more than one year of characteristic information and 24-hour real-time data, and adopts a 64MB NAND FLASH memory; if necessary, historical monitoring information (including raw data and result data) can be called by the MDS4000 system server through the site control layer network.
Referring to fig. 4, a schematic diagram of a butt joint installation structure of a protection circuit board of the transformer bushing online monitoring system provided by the present application is shown;
as shown in fig. 4, in another implementation manner of the embodiment of the present application, the protection circuit board 400 is connected to the end screen 200 through a mounting cylinder 460, and the size of the mounting cylinder 460 is designed according to the size of the end screen 200.
According to the technical scheme, the application provides a transformer bushing on-line monitoring system and method, the on-line monitoring system includes main transformer bushing, end screen, leakage current acquisition unit, protection circuit board, bushing insulation monitoring equipment and voltage acquisition unit, wherein: one end of the end screen is connected with the main transformer bushing through a first cable, and the other end of the end screen is grounded through an end screen grounding cable; the leakage current acquisition unit is arranged on the end screen grounding cable; one end of the protection circuit board is connected in parallel to the end screen through a second cable and the end screen grounding cable, and the other end of the protection circuit board is grounded through a third cable; the sleeve insulation monitoring equipment is connected with the leakage current acquisition unit through a first shielded cable and connected with the voltage acquisition unit through a second shielded cable.
In this way, the leakage current collecting unit is used for collecting the current in the main transformer bushing and transmitting the current to the bushing insulation monitoring equipment; acquiring a PT reference signal through the voltage acquisition unit, and transmitting the PT reference signal to the sleeve insulation monitoring equipment; wherein the PT reference signals include frequency, voltage and phase angle in the main transformer bushing; the sleeve insulation monitoring equipment obtains a sleeve medium loss tangent angle of the main transformer sleeve according to the current, the frequency, the voltage and the phase angle; and comparing the size of the tangent angle of the dielectric loss of the sleeve with a preset judgment index, and judging whether the insulation state of the main transformer sleeve is normal or not under the operating voltage.
Corresponding to the transformer bushing on-line monitoring system provided by the first embodiment of the present application, the second embodiment of the present application provides a transformer bushing on-line monitoring method, which is applied to the transformer bushing on-line monitoring system provided by the first embodiment, the monitoring system includes a main transformer bushing 100, an end screen 200, a leakage current collecting unit 300, a protection circuit board 400, a bushing insulation monitoring device 500, and a voltage collecting unit 600, wherein:
one end of the end screen 200 is connected with the main transformer bushing 100 through a first cable 210, and the other end is grounded through an end screen grounding cable 220;
the leakage current collecting unit 300 is disposed on the end screen grounding cable 220;
one end of the protection circuit board 400 is connected to the end screen 200 in parallel through a second cable 410 and the end screen grounding cable 220, and the other end is grounded through a third cable 420;
the bushing insulation monitoring device 500 is connected to the leakage current collecting unit 300 through a first shielding cable 510, and is connected to the voltage collecting unit 600 through a second shielding cable 520;
the online detection method comprises the following steps:
step 101, collecting current in the main transformer bushing 100 through the leakage current collecting unit 300, and transmitting the current to the bushing insulation monitoring equipment 500;
102, acquiring a PT reference signal through the voltage acquisition unit 600, and transmitting the PT reference signal to the bushing insulation monitoring equipment 500; wherein the PT reference signals include frequency, voltage and phase angle in the main transformer bushing 100;
step 103, obtaining a casing medium loss tangent angle of the main transformer casing 100 by the casing insulation monitoring equipment 500 according to the current, the frequency, the voltage and the phase angle;
and 104, comparing the tangent angle of the casing medium loss with a preset judgment index, and judging whether the insulation state of the main transformer casing 100 is normal.
According to the technical scheme, the application provides a transformer bushing on-line monitoring system and method, the on-line monitoring system includes main transformer bushing, end screen, leakage current acquisition unit, protection circuit board, bushing insulation monitoring equipment and voltage acquisition unit, wherein: one end of the end screen is connected with the main transformer bushing through a first cable, and the other end of the end screen is grounded through an end screen grounding cable; the leakage current acquisition unit is arranged on the end screen grounding cable; one end of the protection circuit board is connected in parallel to the end screen through a second cable and the end screen grounding cable, and the other end of the protection circuit board is grounded through a third cable; the sleeve insulation monitoring equipment is connected with the leakage current acquisition unit through a first shielding cable and connected with the voltage acquisition unit through a second shielding cable.
In this way, the leakage current collecting unit is used for collecting the current in the main transformer bushing and transmitting the current to the bushing insulation monitoring equipment; acquiring a PT reference signal through the voltage acquisition unit, and transmitting the PT reference signal to the sleeve insulation monitoring equipment; wherein the PT reference signals include frequency, voltage and phase angle in the main transformer bushing; the sleeve insulation monitoring equipment obtains a sleeve dielectric loss tangent angle of the main transformer sleeve according to the current, the frequency, the voltage and the phase angle; and comparing the size of the tangent angle of the dielectric loss of the sleeve with a preset judgment index, and judging whether the insulation state of the main transformer sleeve is normal or not under the operating voltage.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains; it is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof; the scope of the invention is limited only by the appended claims.
Claims (10)
1. The utility model provides a transformer bushing on-line monitoring system, its characterized in that, on-line monitoring system includes that main transformer bushing (100), end screen (200), leakage current acquisition unit (300), protection circuit board (400), bushing insulation monitoring facilities (500) and voltage acquisition unit (600), wherein:
one end of the end screen (200) is connected with the main transformer bushing (100) through a first cable (210), and the other end of the end screen is grounded through an end screen grounding cable (220);
the leakage current acquisition unit (300) is arranged on the end screen grounding cable (220);
one end of the protection circuit board (400) is connected to the end screen (200) in parallel through a second cable (410) and the end screen grounding cable (220), and the other end of the protection circuit board is grounded through a third cable (420);
the sleeve insulation monitoring device (500) is connected with the leakage current acquisition unit (300) through a first shielding cable (510), and is connected with the voltage acquisition unit (600) through a second shielding cable (520).
2. The transformer bushing online monitoring system according to claim 1, wherein the leakage current collecting unit (300) is a bushing leakage current sensor.
3. The transformer bushing online monitoring system according to claim 1, wherein the protection circuit board (400) is a circular ring type.
4. The transformer bushing online monitoring system according to claim 1, wherein the protection circuit board (400) comprises an outgoing pin (430), a component (440) and a housing (450), wherein the outgoing pin (430) and the component (440) are disposed on the housing (450).
5. The transformer bushing on-line monitoring system of claim 4, characterized in that the protection circuit board (400) is connected to the end of the end screen (200) through the pin (430).
6. The transformer bushing on-line monitoring system of claim 5, wherein the protection circuit board (400) is grounded through the housing (450).
7. The transformer bushing online monitoring system of claim 6, wherein the pin-out (430), the component (440) and the housing (450) are electrically connected in series in sequence.
8. The transformer bushing online monitoring system of claim 7, wherein the components (440) comprise a gas discharge tube (441), a voltage dependent resistor (442), and a transient suppression diode (443) connected in parallel.
9. The transformer bushing on-line monitoring system of claim 1, wherein 64MB NAND FLASH memory is provided in the bushing insulation monitoring device (500).
10. An online monitoring method for transformer bushing, which is applied to the online monitoring system for transformer bushing according to any one of claims 1-9, wherein the monitoring system comprises a main transformer bushing (100), a tap screen (200), a leakage current collecting unit (300), a protection circuit board (400), a bushing insulation monitoring device (500) and a voltage collecting unit (600), wherein:
one end of the end screen (200) is connected with the main transformer bushing (100) through a first cable (210), and the other end of the end screen is grounded through an end screen grounding cable (220);
the leakage current acquisition unit (300) is arranged on the end screen grounding cable (220);
one end of the protection circuit board (400) is connected to the end screen (200) in parallel through a second cable (410) and the end screen grounding cable (220), and the other end of the protection circuit board is grounded through a third cable (420);
the sleeve insulation monitoring device (500) is connected with the leakage current acquisition unit (300) through a first shielding cable (510), and is connected with the voltage acquisition unit (600) through a second shielding cable (520);
the online detection method comprises the following steps:
collecting the current in the main transformer bushing (100) through the leakage current collecting unit (300) and transmitting the current to the bushing insulation monitoring device (500);
acquiring a PT reference signal by the voltage acquisition unit (600) and transmitting the PT reference signal to the bushing insulation monitoring device (500); wherein the PT reference signal comprises a frequency, a voltage and a phase angle in the main transformer bushing (100);
the sleeve insulation monitoring equipment (500) obtains a sleeve dielectric loss tangent angle of the main transformer sleeve (100) according to the current, the frequency, the voltage and the phase angle;
and comparing the tangent angle of the dielectric loss of the sleeve with the preset judgment index to judge whether the insulation state of the main transformer sleeve (100) is normal or not.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211160085.0A CN115453290A (en) | 2022-09-22 | 2022-09-22 | Transformer bushing online monitoring system and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211160085.0A CN115453290A (en) | 2022-09-22 | 2022-09-22 | Transformer bushing online monitoring system and method |
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| CN115453290A true CN115453290A (en) | 2022-12-09 |
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| CN202211160085.0A Pending CN115453290A (en) | 2022-09-22 | 2022-09-22 | Transformer bushing online monitoring system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117970181A (en) * | 2024-03-27 | 2024-05-03 | 南方电网科学研究院有限责任公司 | Transformer bushing end screen ground fault detection device |
-
2022
- 2022-09-22 CN CN202211160085.0A patent/CN115453290A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117970181A (en) * | 2024-03-27 | 2024-05-03 | 南方电网科学研究院有限责任公司 | Transformer bushing end screen ground fault detection device |
| CN117970181B (en) * | 2024-03-27 | 2024-05-28 | 南方电网科学研究院有限责任公司 | Transformer bushing end screen ground fault detection device |
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