CN216560748U - Embedded ring type measuring system - Google Patents
Embedded ring type measuring system Download PDFInfo
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- CN216560748U CN216560748U CN202122650550.6U CN202122650550U CN216560748U CN 216560748 U CN216560748 U CN 216560748U CN 202122650550 U CN202122650550 U CN 202122650550U CN 216560748 U CN216560748 U CN 216560748U
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Abstract
The utility model discloses an embedded ring type measuring system which comprises an embedded metal ring, a metal shielding shell and a central conductor, wherein the central conductor is arranged at the central position of the embedded metal ring, and the metal shielding shell is covered on the outer side of the embedded metal ring; a port is inserted in the metal shielding shell, and one end of the port extending into the metal shielding shell is connected with the embedded metal ring; the port is externally connected with a front-stage capacitor, the front-stage capacitor is connected with a rear-stage resistor through a transmission cable, and the rear-stage resistor is electrically connected with an oscilloscope. The utility model effectively solves the flashover problem, improves the high-frequency cut-off frequency when the port is externally connected with the preceding stage capacitor, and can greatly improve the equivalent bandwidth of the measurement system; the method effectively solves the problems of narrow frequency band and poor reliability of the transient overvoltage steep wave measurement method based on the transformer bushing sensor.
Description
Technical Field
The utility model relates to the technical field of transient overvoltage steep wave measurement, in particular to an embedded ring type measurement system.
Background
There are many methods for measuring transient overvoltage steep waves at home and abroad, and a capacitance voltage division method is mainly adopted to measure the steep waves. The basic principle of measuring steep waves by a capacitance voltage division method is as follows: an electrode is arranged at a measuring point, a coupling capacitor is formed between the electrode and a high-voltage conductor, then the electrode and the high-voltage conductor are grounded through a large capacitor, the two series capacitors form an impedance voltage division relation, and the voltage at the high-voltage conductor can be calculated through a voltage division ratio by measuring the voltage at the capacitor of a low-voltage arm, wherein the principle is shown in figure 1. At present, transient overvoltage steep wave measurement methods based on transformer bushing sensors are mostly adopted, and the problems of narrow frequency band and poor reliability exist.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an embedded ring type measuring system to solve the problems.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
a pre-buried ring type measuring system comprises a pre-buried metal ring, a metal shielding shell and a central conductor, wherein the central conductor is arranged at the central position of the pre-buried metal ring, and the metal shielding shell covers the outer side of the pre-buried metal ring; a port is inserted into the metal shielding shell, and one end of the port extending into the metal shielding shell is connected with the embedded metal ring; the port is externally connected with a front-stage capacitor, the front-stage capacitor is connected with a rear-stage resistor through a transmission cable, and the rear-stage resistor is electrically connected with an oscilloscope.
Further, a capacitor C between the embedded metal ring and the high-voltage guide rod115pF to 19 pF.
Further, the grounding capacitor C of the pre-embedded metal ring2230pF to 250 pF.
Furthermore, the number of the ports is four, and the ports are arranged on the metal shielding shell in a surrounding mode at equal intervals.
Furthermore, the oscilloscope also comprises a power supply system which is electrically connected with the oscilloscope.
The oscilloscope, the signal processing module and the PC are sequentially connected in series.
Has the advantages that:
the setting of the preceding stage capacitor effectively solves the flashover problem, improves the high-frequency cut-off frequency when the port is externally connected with the preceding stage capacitor, and can greatly improve the equivalent bandwidth of a measurement system; the method effectively solves the problems of narrow frequency band and poor reliability of the transient overvoltage steep wave measurement method based on the transformer bushing sensor.
Drawings
Fig. 1 is a schematic diagram of capacitive voltage division.
Fig. 2 is a schematic structural diagram of the present invention.
Wherein, in the figure:
1-embedding a metal ring; 2-a metallic shielding housing; 3-a central conductor; 4-port; 5-a front stage capacitance; 6-a transmission cable; 7-rear stage resistance; 8-an oscilloscope; 9-power supply system.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
Referring to the attached drawing 2, the utility model discloses an embedded ring type measuring system, which comprises an embedded metal ring 1, a metal shielding shell 2 and a central conductor 3, wherein the central conductor 3 is arranged at the central position of the embedded metal ring 1, and the metal shielding shell 2 is covered on the outer side of the embedded metal ring 1; a port 4 is inserted into the metal shielding shell 2, and one end of the port 4 extending into the metal shielding shell 2 is connected with the embedded metal ring 1; the port 4 is externally connected with a front-stage capacitor 5, the front-stage capacitor 5 is connected with a rear-stage resistor 7 through a transmission cable 6, and the rear-stage resistor 7 is electrically connected with an oscilloscope 8. Wherein the front stage capacitor 5 (C)L) The low-inductance high-voltage high-frequency stable capacitor is adopted.
In this embodiment, four ports 4 are provided, and are circumferentially disposed on the metal shielding shell 2 at equal intervals.
According to the utility model, four capacitors are externally connected to the four ports 4 of the embedded metal ring 1, and low-inductance and high-stability capacitors are selected, so that the flashover problem is effectively solved, the high-frequency cut-off frequency (10MHz) when the four ports 4 are externally connected with the preceding-stage capacitors 5 is improved, and the bandwidth of embedded ring type measurement is effectively improved.
In this embodiment, the capacitor C between the embedded metal ring 1 and the high-voltage guide rod is embedded1Is 15pF to 19pF, preferably 17 pF.
In this embodiment, the grounded capacitor C of the metal ring 1 is embedded2Is 230pF to 250pF, preferably 240 pF.
In this embodiment, the system further includes a power supply system 9, and the power supply system 9 is electrically connected to the oscilloscope 8.
In this embodiment, the device further includes a signal processing module and a PC, and the oscilloscope 8, the signal processing module and the PC are sequentially connected in series. The oscilloscope 8 is used for displaying partial discharge data generated under the action of different steep wave overvoltage and displaying the partial discharge data on a screen in a waveform mode; the signal processing module analyzes, processes and stores the partial discharge data, and transmits the result to the PC, so that the reference and the check of the working personnel are facilitated.
The arrangement of the preceding-stage capacitor 5 effectively solves the flashover problem, improves the high-frequency cut-off frequency when the port 4 is externally connected with the preceding-stage capacitor 5, and can greatly improve the equivalent bandwidth of a measurement system; the transient overvoltage steep wave measuring method based on the transformer sleeve sensor effectively solves the problems of narrow frequency band and poor reliability of a transient overvoltage steep wave measuring method based on the transformer sleeve sensor, and is suitable for GIS with embedded electrodes.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. An embedded ring type measuring system is characterized by comprising an embedded metal ring, a metal shielding shell and a central conductor, wherein the central conductor is arranged at the central position of the embedded metal ring, and the metal shielding shell is covered on the outer side of the embedded metal ring; a port is inserted into the metal shielding shell, and one end of the port extending into the metal shielding shell is connected with the embedded metal ring; the port is externally connected with a front-stage capacitor, the front-stage capacitor is connected with a rear-stage resistor through a transmission cable, and the rear-stage resistor is electrically connected with an oscilloscope.
2. The embedded ring type measuring system as claimed in claim 1, wherein the capacitance C between the embedded metal ring and the high voltage guide rod115pF to 19 pF.
3. The embedded ring type measuring system according to claim 1, wherein the grounded capacitance C of the embedded metal ring2230pF to 250 pF.
4. The embedded ring type measuring system as claimed in claim 1, wherein the number of the ports is four, and the ports are circumferentially arranged on the metal shielding shell at equal intervals.
5. The embedded ring type measurement system according to claim 1, further comprising a power supply system, wherein the power supply system is electrically connected to the oscilloscope.
6. The embedded ring type measurement system according to claim 1, further comprising a signal processing module and a PC, wherein the oscilloscope, the signal processing module and the PC are sequentially connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122650550.6U CN216560748U (en) | 2021-11-01 | 2021-11-01 | Embedded ring type measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122650550.6U CN216560748U (en) | 2021-11-01 | 2021-11-01 | Embedded ring type measuring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216560748U true CN216560748U (en) | 2022-05-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122650550.6U Active CN216560748U (en) | 2021-11-01 | 2021-11-01 | Embedded ring type measuring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216560748U (en) |
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2021
- 2021-11-01 CN CN202122650550.6U patent/CN216560748U/en active Active
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