CN110596553A - Transformer on-line monitoring measuring device - Google Patents
Transformer on-line monitoring measuring device Download PDFInfo
- Publication number
- CN110596553A CN110596553A CN201910956605.0A CN201910956605A CN110596553A CN 110596553 A CN110596553 A CN 110596553A CN 201910956605 A CN201910956605 A CN 201910956605A CN 110596553 A CN110596553 A CN 110596553A
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- Prior art keywords
- transformer
- resistor
- measuring device
- line monitoring
- metal sensing
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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
- G01R29/12—Measuring electrostatic fields or voltage-potential
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The invention discloses an on-line monitoring and measuring device for a transformer, which relates to the technical field of transformer monitoring and comprises a measuring module consisting of a metal sensing sheet, a resistor, a cable and a voltage detector and an electric field intensity display module for calculating and displaying the electric field intensity of the inner surface of the metal sensing sheet according to the voltages at two ends of the resistor; the metal sensing sheet is a part cut from the transformer shell and then fixed at the notch of the transformer shell through an insulating medium; one end of the resistor is connected with the metal sensing sheet, and the other end of the resistor is connected with the transformer shell; the two ends of the resistor are connected with one end of the cable, and the other end of the cable is connected with a voltage meter for acquiring the voltages at the two ends of the resistor and sending the voltages at the two ends of the resistor to the electric field intensity display module; the invention realizes the purpose of monitoring the running state of the transformer in real time by a simple measuring device, can monitor the power frequency electric field intensity on the inner surface of the shell of the transformer and the electric field intensity under various faults or partial discharge on line, and is convenient for the optimization design of the electric field intensity of high-voltage power equipment.
Description
Technical Field
The invention relates to the technical field of transformer monitoring, in particular to an online monitoring and measuring device for a transformer.
Background
The power transformer is an important device in a power system, and the reliability of the power transformer is related to whether a power grid can safely and stably operate. The optimal design of the distribution of the electric field intensity is the key of the design of the transformer, the optimal design of the electric field intensity can not only ensure the safe and stable operation of the transformer, but also improve the economical efficiency of the design of the transformer. In the power transformer in operation, partial discharge can occur due to possible defects in the insulation, and the partial discharge can accelerate the insulation degradation of the power transformer, and even electrochemical breakdown of the insulation can occur in severe cases. Therefore, the method has practical value for real-time online monitoring and diagnosis of the insulation partial discharge of the power transformer in operation. The on-line monitoring mainly comprises the steps of monitoring the power transformer in real time by using related equipment, analyzing and processing acquired information in real time through computer software, knowing the internal condition of the power transformer in time, and maintaining the power transformer in case of need.
In recent years, a High Frequency (UHF) measurement method is rapidly developed, and an UHF detection method has the advantages of a wide measurement Frequency band, High sensitivity, strong anti-interference capability and the like, but also has the problems of High acquisition and storage cost, low processing speed and the like of an UHF signal.
Disclosure of Invention
The invention aims to provide an on-line monitoring and measuring device for a transformer, which can monitor the running state of the transformer in real time, including the electric field intensity in normal running, fault and partial discharge states, and has low cost.
In order to achieve the purpose, the invention provides the following scheme:
a transformer on-line monitoring and measuring device comprises a measuring module and an electric field intensity display module connected with the measuring module;
the measuring module comprises a metal sensing sheet, a resistor, a cable and a pressure detector; wherein the metal sensing piece is a part cut from a transformer housing, and the metal sensing piece is fixed at a notch of the transformer housing through an insulating medium before measuring voltage;
one end of the resistor is connected with the metal sensing sheet, and the other end of the resistor is connected with the transformer shell; two ends of the resistor are connected with one end of the cable, and the other end of the cable is connected with the voltage detector; the voltage detector is used for acquiring voltages at two ends of the resistor and sending the voltages at the two ends of the resistor to the electric field intensity display module; and the electric field intensity display module is used for calculating and displaying the electric field intensity at the inner surface of the metal sensor sheet according to the voltages at the two ends of the resistor.
Optionally, the insulating medium is an insulating film; the metal sensing piece is pasted at the notch of the transformer shell through the insulating film, so that the metal sensing piece is separated from the transformer shell.
Optionally, the insulating film is a polyimide film.
Optionally, the insulating medium is a connecting flange with insulating bolts; the connecting flange is positioned at the notch of the transformer shell; the metal sensing piece is connected with the connecting flange through the insulating bolt, so that the metal sensing piece and the transformer shell are electrically installed at the notch of the transformer shell without contacting with each other.
Optionally, the connection flange is integrally formed on the transformer housing or movably mounted at a notch of the transformer housing.
Optionally, the connection flange and the metal sensing piece are filled with an insulating material or sealed with an insulating sealing ring to prevent liquid stored inside the transformer from leaking.
Optionally, when the insulating medium is a connecting flange with insulating bolts, the metal sensing piece is processed to have a flanged structure.
Optionally, the resistance range of the resistor is 50 Ω to 1 Μ Ω.
Optionally, the positions and the number of the measuring points in the transformer online monitoring and measuring device are determined according to the actual requirements of the transformer; wherein one of the measurement points corresponds to one of the measurement modules.
Optionally, the online monitoring and measuring device further includes a metal shielding box; the metal shielding box is arranged on the transformer shell, so that the resistor, the metal sensing sheet and the insulating medium are positioned between the metal shielding box and the transformer shell; the metal shielding box is used for shielding external electromagnetic interference.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides an on-line monitoring and measuring device for a transformer, which can quickly acquire the voltage condition of a monitored part through a simple voltage measuring device, further judge the running condition in the transformer through electric field analysis, realize the purpose of monitoring the running state of the transformer in real time, solve the problems of high acquisition and storage cost, low processing speed and the like of ultrahigh frequency signals due to a high-frequency measuring method, provide technical support for the optimized design of the distribution of the electric field strength in the transformer, and improve the economy of the transformer design.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a top view of an on-line monitoring and measuring device for a transformer according to an embodiment of the present invention;
FIG. 2 is a top view of an on-line monitoring and measuring device of a transformer with an insulating medium being an insulating film according to an embodiment of the present invention;
FIG. 3 is a top view of an on-line monitoring and measuring device of a transformer with an insulating medium being a connecting flange with insulating bolts according to an embodiment of the present invention;
fig. 4 is a schematic diagram of the distribution of the measurement points according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide an on-line monitoring and measuring device for a transformer, which can monitor the running state of the transformer in real time and has low cost.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a top view of an on-line transformer monitoring and measuring device according to an embodiment of the present invention, and as shown in fig. 1, the on-line transformer monitoring and measuring device according to the embodiment includes a measuring module and an electric field strength display module 11 connected to the measuring module.
The measuring module comprises a metal sensing sheet 12, a resistor 13, a cable 14 and a pressure detector 15; wherein the metal sensor strip 12 is a part cut from a transformer housing 16, and the metal sensor strip 12 is fixed at a cut of the transformer housing 16 through an insulating medium 17 before measuring a voltage. The transformer housing 16 has a thickness and is grounded via a ground line.
One end of the resistor 13 is connected with the metal sensing sheet 12, and the other end of the resistor 13 is connected with the transformer shell 16; two ends of the resistor 13 are connected with one end of the cable 14, and the other end of the cable 14 is connected with the voltage detector 15; the voltage detector 15 is configured to obtain voltages at two ends of the resistor, and send the voltages at two ends of the resistor to the electric field strength display module 11.
The electric field intensity display module 11 is used for calculating and displaying the electric field intensity on the inner surface of the metal sensing sheet 12 according to the voltages at the two ends of the resistor, specifically, calculating and displaying the electric field intensity on the inner surface of the metal sensing sheet 12 through the relationship between the voltages at the two ends of the resistor and the electric field on the inner surface of the transformer shell, so as to explain the internal operation condition of the transformer.
Preferably, the electric field strength display module 11 is a voltage display.
Preferably, the resistance value of the resistor 13 ranges from 50 Ω to 1M Ω.
Preferably, the online monitoring and measuring device further comprises a metal shielding box (not shown in the figure); the metal shielding box is mounted on the transformer housing 16, so that the resistor 13, the metal sensing piece 12 and the insulating medium 17 are positioned between the metal shielding box and the transformer housing 16; the metal shielding box is used for shielding external electromagnetic interference.
Fig. 2 is a top view of an online monitoring and measuring device of a transformer with an insulating film as an insulating medium according to an embodiment of the present invention, as shown in fig. 2, the insulating medium 17 in this embodiment is an insulating film 21; the metal sensing piece 12 is adhered to the cut of the transformer housing 16 through the insulating film 21, so that the metal sensing piece 12 is separated from the transformer housing 16.
The insulating film 21 is a polyimide film or other insulating material.
Fig. 3 is a top view of a transformer on-line monitoring and measuring device with an insulating medium being a connecting flange with insulating bolts according to an embodiment of the present invention, as shown in fig. 3, the insulating medium 17 in this embodiment is a connecting flange 31 with insulating bolts 32; the connecting flange 31 is positioned at the notch of the transformer shell 16; the metal sensing piece 12 is connected with the connecting flange 31 through an insulating bolt 32, so that the metal sensing piece 12 and the transformer shell 16 are installed at the notch of the transformer shell 16 without being in electric contact. The use of the attachment flange 31 facilitates the mounting and dismounting of the metal sensor plate 12, allowing the metal sensor plate 12 to be independent of the transformer housing 16.
The connecting flange 31 is a flange fixed by bolts, that is, the connecting flange 31 is movably mounted at the notch of the transformer housing 16 by bolts, or the connecting flange 16 is integrally formed on the transformer housing 16, that is, the connecting flange 16 and the transformer housing are integrally formed.
In order to prevent the liquid stored inside the transformer from leaking and ensure the air tightness of the transformer, the space between the connecting flange 31 and the metal sensing piece 12 is filled with an insulating material 33 or sealed with an insulating sealing ring 34.
Preferably, the insulating material 33 is a polyimide material or other insulating material. The insulating seal ring 34 is a rubber seal ring.
When the insulating medium 17 is a connecting flange 31 with insulating bolts 32, the metal sensing piece 12 is also processed into a flange structure, so that the metal sensing piece 12 is better installed at the notch of the transformer housing 16.
The positions and the number of measuring points in the transformer online monitoring and measuring device are determined according to the actual requirement of the transformer; wherein one of the measurement points corresponds to one of the measurement modules. That is to say, the metal sensor sheets 12 are distributed on the transformer casing 16, and are installed at multiple measuring points, and the installation positions and number can be determined according to actual conditions, as shown in fig. 4, in which the numbers 1-9 represent different measuring points on the transformer casing, and the transformer casing is further provided with a low-voltage bushing and a high-voltage bushing.
Compared with the prior art, the transformer on-line monitoring and measuring device provided by the invention has the following advantages:
(1) compared with the existing high-frequency detection method, the transformer on-line monitoring and measuring device provided by the invention does not need to be provided with a sensor, and has the advantages of low storage cost, high processing speed and the like.
(2) The transformer on-line monitoring and measuring device provided by the invention can be directly arranged on a transformer shell and has the advantages of small volume, simple structure, low cost and the like.
(3) The transformer on-line monitoring and measuring device provided by the invention is arranged outside the transformer, does not need to be arranged inside, does not influence the normal operation of the transformer, and is safer.
(4) The transformer on-line monitoring and measuring device provided by the invention is mounted in a multi-point distributed manner, is more flexible, and the shell is grounded, so that the device is safer and more reliable.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. The transformer on-line monitoring and measuring device is characterized by comprising a measuring module and an electric field intensity display module connected with the measuring module;
the measuring module comprises a metal sensing sheet, a resistor, a cable and a pressure detector; wherein the metal sensing piece is a part cut from a transformer housing, and the metal sensing piece is fixed at a notch of the transformer housing through an insulating medium before measuring voltage;
one end of the resistor is connected with the metal sensing sheet, and the other end of the resistor is connected with the transformer shell; two ends of the resistor are connected with one end of the cable, and the other end of the cable is connected with the voltage detector; the voltage detector is used for acquiring voltages at two ends of the resistor and sending the voltages at the two ends of the resistor to the electric field intensity display module; and the electric field intensity display module is used for calculating and displaying the electric field intensity at the inner surface of the metal sensor sheet according to the voltages at the two ends of the resistor.
2. The on-line monitoring and measuring device of the transformer as claimed in claim 1, wherein the insulating medium is an insulating film; the metal sensing piece is pasted at the notch of the transformer shell through the insulating film, so that the metal sensing piece is separated from the transformer shell.
3. The on-line monitoring and measuring device for the transformer as claimed in claim 2, wherein the insulating film is a polyimide film.
4. The on-line monitoring and measuring device of the transformer as claimed in claim 1, wherein the insulating medium is a connecting flange with insulating bolts; the connecting flange is positioned at the notch of the transformer shell; the metal sensing piece is connected with the connecting flange through the insulating bolt, so that the metal sensing piece and the transformer shell are electrically installed at the notch of the transformer shell without contacting with each other.
5. The on-line monitoring and measuring device of the transformer as claimed in claim 4, wherein the connecting flange is integrally formed on the transformer housing or movably mounted at a notch of the transformer housing.
6. The on-line monitoring and measuring device for the transformer as claimed in claim 4, wherein the space between the connecting flange and the metal sensing piece is filled with an insulating material or sealed by an insulating sealing ring so as to prevent the liquid stored inside the transformer from leaking.
7. The on-line monitoring and measuring device of the transformer as claimed in claim 1, wherein when the insulating medium is a connecting flange with insulating bolts, the metal sensing piece is processed into a structure with a flange.
8. The on-line monitoring and measuring device for the transformer as claimed in claim 1, wherein the resistance value of the resistor is in a range of 50 Ω -1M Ω.
9. The transformer on-line monitoring and measuring device according to claim 1, wherein the positions and the number of the measuring points in the transformer on-line monitoring and measuring device are determined according to the actual requirement of the transformer; wherein one of the measurement points corresponds to one of the measurement modules.
10. The on-line monitoring and measuring device of the transformer as claimed in claim 1, wherein the on-line monitoring and measuring device further comprises a metal shielding box; the metal shielding box is arranged on the transformer shell, so that the resistor, the metal sensing sheet and the insulating medium are positioned between the metal shielding box and the transformer shell; the metal shielding box is used for shielding external electromagnetic interference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910956605.0A CN110596553A (en) | 2019-10-10 | 2019-10-10 | Transformer on-line monitoring measuring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910956605.0A CN110596553A (en) | 2019-10-10 | 2019-10-10 | Transformer on-line monitoring measuring device |
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| CN110596553A true CN110596553A (en) | 2019-12-20 |
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| CN201910956605.0A Pending CN110596553A (en) | 2019-10-10 | 2019-10-10 | Transformer on-line monitoring measuring device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112034269A (en) * | 2020-09-07 | 2020-12-04 | 广东电网有限责任公司广州供电局 | Electric field intensity measuring device suitable for cable termination fault detection |
| CN112034270A (en) * | 2020-09-07 | 2020-12-04 | 广东电网有限责任公司广州供电局 | Detection apparatus for cable intermediate head power frequency electric field intensity |
| CN112034235A (en) * | 2020-09-07 | 2020-12-04 | 广东电网有限责任公司广州供电局 | Device and method suitable for measuring power frequency voltage of T-shaped cable connector |
| CN112034236A (en) * | 2020-09-07 | 2020-12-04 | 华北电力大学 | Online monitoring device and method for transient voltage of cable elbow terminal |
| CN112946343A (en) * | 2021-01-29 | 2021-06-11 | 华北电力大学 | Overhead line power frequency voltage measuring device and measuring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112034269A (en) * | 2020-09-07 | 2020-12-04 | 广东电网有限责任公司广州供电局 | Electric field intensity measuring device suitable for cable termination fault detection |
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| CN112034235A (en) * | 2020-09-07 | 2020-12-04 | 广东电网有限责任公司广州供电局 | Device and method suitable for measuring power frequency voltage of T-shaped cable connector |
| CN112034236A (en) * | 2020-09-07 | 2020-12-04 | 华北电力大学 | Online monitoring device and method for transient voltage of cable elbow terminal |
| CN112034236B (en) * | 2020-09-07 | 2021-08-03 | 华北电力大学 | Online monitoring device and method for transient voltage of cable elbow terminal |
| CN112034235B (en) * | 2020-09-07 | 2023-06-27 | 广东电网有限责任公司广州供电局 | Device and method suitable for power frequency voltage measurement of cable T-shaped connector |
| CN112946343A (en) * | 2021-01-29 | 2021-06-11 | 华北电力大学 | Overhead line power frequency voltage measuring device and measuring method |
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Application publication date: 20191220 |
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