CN218602266U - Voltage-sharing capacitor with pressure monitoring device for converter valve - Google Patents
Voltage-sharing capacitor with pressure monitoring device for converter valve Download PDFInfo
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- CN218602266U CN218602266U CN202222634515.XU CN202222634515U CN218602266U CN 218602266 U CN218602266 U CN 218602266U CN 202222634515 U CN202222634515 U CN 202222634515U CN 218602266 U CN218602266 U CN 218602266U
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Abstract
The utility model relates to a take pressure monitoring device's voltage-sharing capacitor for converter valve, its characterized in that: the device comprises an upper cover plate, a lower cover plate, a hollow composite sleeve, a capacitor core and a pressure monitoring meter; the capacitor core is electrically connected with the upper cover plate and the lower cover plate through a wire, so that the reliability is high; through the pressure monitoring device, the internal gas pressure of the capacitor can be monitored in real time, the gas leakage abnormity of the capacitor can be warned in time, and the reliable operation of the capacitor is ensured; the sleeve adopts a hollow composite sleeve, the process is mature and stable, and the partial discharge capacity of the capacitor is low; SF6 gas is adopted, so that the electrical insulation strength is high; positive pressure gas is filled in the capacitor, and an internal positive pressure value is kept in the full operation temperature range of the capacitor, so that insulation damage and breakdown caused by negative pressure moisture absorption are avoided; the capacitor element adopts full-film medium, the elements are electrically connected in a cold welding mode, high impact vibration load can be endured, the electrical connection is reliable, the risk of electrical virtual connection is avoided, and the capacitor element is suitable for horizontal, vertical or inclined installation.
Description
Technical Field
The utility model relates to a voltage-sharing capacitor technical field especially relates to a take pressure monitoring device's voltage-sharing capacitor for converter valve.
Background
The high-voltage direct-current transmission is rapidly developed in China, and becomes an important way for realizing the optimal allocation of energy resources in China. Converter valves are becoming more and more important as core equipment for high voltage direct current transmission. When equipment in a valve hall, such as a converter transformer valve side sleeve, has a flashover fault to the ground, each potential cannot be changed in time within the first microseconds of grounding, and overvoltage at two ends of a fault-phase high-rise valve and a valve arrester of the fault-phase high-rise valve has high-frequency steep wave properties. Due to the influence of stray capacitance, the voltage distribution between thyristor stages in the valve section is not uniform under high-frequency impact. Through establish ties an impact voltage-sharing electric capacity at every valve section, this impact voltage-sharing electric capacity plays fine voltage-sharing effect between the valve section when the valve suffers high frequency impulse voltage.
The potential distribution of the converter valve under the lightning and steep wave impulse voltage is uneven, so that the voltage among valve sections is uneven, and the thyristor is damaged;
in the common scheme, a spring and copper plug connector structure at the upper end of the voltage-sharing capacitor as shown in figure 1 is not easy to install, and the spring structure may have poor electrical contact to cause internal discharge; the device has no internal gas pressure monitoring function, if the product leaks gas, the gas cannot be found in time, and the internal gas pressure of the capacitor is reduced and the insulation is damaged due to long-time operation, so that the insulation breakdown of the capacitor is caused; the epoxy casting sleeve is easy to cause excessive local discharge due to incomplete control of the casting process, a capacitor is heated after long-time operation, and breakdown is caused by insulation aging; the mixed gas of SF6 and N2 is adopted, so that the electrical insulation strength is low, and internal breakdown is easily caused; the inside atmospheric pressure of the capacitor of this structure is low, and when the temperature was less than the leaving factory temperature, negative pressure, absorption moisture appeared easily in the capacitor inside, and the capacitor insulation descends and leads to puncturing, endangers the operation of valve room.
1 in FIG. 1: a spring connection terminal; 2: an internal capacitor core; 21: sulfur hexafluoride and nitrogen mixed gas; 3: an outer shed; 4: a base plate.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a take pressure monitoring device's voltage-sharing capacitor for converter valve, can solve general voltage-sharing capacitor electric contact bad, do not have the pressure monitoring function, the problem that partial discharge easily exceeds standard.
In order to solve the technical problem, the utility model adopts the technical scheme that: the utility model provides a take pressure monitoring device's voltage-sharing capacitor ware for converter valve which innovation point lies in: the device comprises an upper cover plate, a lower cover plate, a hollow composite sleeve, a capacitor core and a pressure monitoring meter;
the hollow composite sleeve comprises a sleeve main body, an umbrella skirt and a connecting flange; the sleeve main body is of a cylindrical shell-shaped structure, and openings are formed in two ends of the sleeve main body; the connecting flange is provided with a pair of embedded columns, and the embedded columns on the pair of connecting flanges are respectively embedded on the outer walls of the two ends of the sleeve main body; a step surface is formed between the end surface of the embedded column of the connecting flange and the outer wall of the sleeve main body; the umbrella skirt is arranged on the outer wall of the sleeve main body and positioned between the end faces of the nested columns of the two connecting flanges; sulfur hexafluoride gas is filled in the hollow composite sleeve;
the upper cover plate is arranged at the top end of the hollow composite sleeve, the upper cover plate and a connecting flange of the hollow composite sleeve are locked through a bolt, and a first wiring terminal is arranged on the back surface of the upper cover plate; the lower cover plate is arranged at the bottom end of the hollow composite sleeve, the lower cover plate and a connecting flange of the hollow composite sleeve are locked through a bolt, and a second wiring terminal is arranged on the surface of the lower cover plate; an L-shaped pressure monitoring channel is formed in the lower cover plate, one end of the pressure monitoring channel is communicated with the inner cavity of the hollow composite sleeve, the other end of the pressure monitoring channel extends to the side face of the lower cover plate, and a pressure monitoring meter is mounted at the end part of the pressure monitoring channel;
the capacitor core is arranged in the hollow composite sleeve, and the top end of the capacitor core is connected to the first wiring terminal of the upper cover plate through a wire; the bottom end of the capacitor core is connected to the second wiring terminal of the lower cover plate through a wire.
Furthermore, the capacitor core is arranged on the lower cover plate through a connecting frame; the lead on the capacitor core is connected with the wiring terminal in a cold welding mode.
The utility model has the advantages that:
1) The electric connection between the capacitor core and the upper and lower cover plates is realized through the wire, and the reliability is high; the pressure monitoring device can monitor the gas pressure in the capacitor in real time, and can early warn the gas leakage abnormality of the capacitor in time so as to ensure the reliable operation of the capacitor; the sleeve adopts a hollow composite sleeve, the process is mature and stable, and the partial discharge capacity of the capacitor is low; SF6 gas is adopted, so that the electric insulation strength is high; positive pressure gas is filled in the capacitor, and an internal positive pressure value is kept in the full operation temperature range of the capacitor, so that insulation damage and breakdown caused by negative pressure moisture absorption are avoided; the capacitor element adopts a full-film medium, the elements are electrically connected in a cold welding mode, high impact vibration load can be endured, the electrical connection is reliable, the risk of electrical virtual connection is avoided, and the capacitor element is suitable for horizontal, vertical or inclined installation.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of a conventional voltage-sharing capacitor.
Fig. 2 is the utility model discloses a take pressure monitoring device's voltage-sharing capacitor structure sketch map for converter valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The voltage-sharing capacitor with the pressure monitoring device for the converter valve as shown in the figure 2 comprises an upper cover plate 5, a lower cover plate 6, a hollow composite sleeve 7, a capacitor core 8 and a pressure monitoring meter 9.
The hollow composite sleeve 7 comprises a sleeve main body 71, an umbrella skirt 72 and a connecting flange 73; the sleeve main body 71 is a cylindrical shell-shaped structure and is provided with openings at two ends; the connecting flange 73 is provided with a pair of embedded columns, and the embedded columns on the connecting flange 73 are respectively embedded on the outer walls of the two ends of the sleeve main body; a step surface is formed between the end surface of the embedded column of the connecting flange 73 and the outer wall of the sleeve main body 71; the shed 72 is arranged on the outer wall of the sleeve main body 71 and is positioned between the end faces of the nested columns of the two connecting flanges 73; the hollow composite bushing 7 is filled with sulfur hexafluoride gas 74.
The upper cover plate 5 is arranged at the top end of the hollow composite sleeve 7, the upper cover plate 5 and the connecting flange 73 of the hollow composite sleeve 7 are locked through bolts, and a first wiring terminal is arranged on the back surface of the upper cover plate 5; the lower cover plate 6 is arranged at the bottom end of the hollow composite sleeve, the lower cover plate 6 and a connecting flange of the hollow composite sleeve 7 are locked through bolts, and a second wiring terminal is arranged on the surface of the lower cover plate; an L-shaped pressure monitoring channel is arranged on the lower cover plate 6, one end of the pressure monitoring channel is communicated with the inner cavity of the hollow composite sleeve 7, the other end of the pressure monitoring channel extends to the side surface of the lower cover plate 6, and a pressure monitoring meter 9 is arranged at the end part of the pressure monitoring channel.
The capacitor core 8 is arranged in the hollow composite sleeve, and the top end of the capacitor core 8 is connected to a first connecting terminal of the upper cover plate 5 through a lead 81; the bottom end of the capacitor core 8 is connected with the second connecting terminal of the lower cover plate 6 through a lead.
The capacitor core 8 is arranged on the lower cover plate 6 through a connecting frame; the lead on the capacitor core 8 is connected with the wiring terminal in a cold welding mode.
The utility model discloses a theory of operation is: the capacitor core is electrically connected with the upper cover plate and the lower cover plate through a wire, so that the reliability is high; through the pressure monitoring device, the internal gas pressure of the capacitor can be monitored in real time, the gas leakage abnormity of the capacitor can be warned in time, and the reliable operation of the capacitor is ensured; the sleeve adopts a hollow composite sleeve, the process is mature and stable, and the partial discharge capacity of the capacitor is low; SF6 gas is adopted, so that the electrical insulation strength is high; positive pressure gas is filled in the capacitor, and an internal positive pressure value is kept within the full operation temperature range of the capacitor, so that insulation damage and breakdown caused by negative pressure moisture absorption are avoided; the capacitor element adopts a full-film medium, the elements are electrically connected in a cold welding mode, high impact vibration load can be endured, the electrical connection is reliable, the risk of electrical virtual connection is avoided, and the capacitor element is suitable for horizontal, vertical or inclined installation.
It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. The utility model provides a take pressure monitoring device's voltage-sharing capacitor for converter valve which characterized in that: the device comprises an upper cover plate, a lower cover plate, a hollow composite sleeve, a capacitor core and a pressure monitoring meter;
the hollow composite sleeve comprises a sleeve main body, an umbrella skirt and a connecting flange; the sleeve main body is of a cylindrical shell-shaped structure, and openings are formed in two ends of the sleeve main body; the connecting flange is provided with a pair of embedded columns, and the embedded columns on the pair of connecting flanges are respectively embedded on the outer walls of the two ends of the sleeve main body; a step surface is formed between the end surface of the embedded column of the connecting flange and the outer wall of the sleeve main body; the umbrella skirt is arranged on the outer wall of the sleeve main body and positioned between the end faces of the nested columns of the two connecting flanges; sulfur hexafluoride gas is filled in the hollow composite sleeve;
the upper cover plate is arranged at the top end of the hollow composite sleeve, the upper cover plate and a connecting flange of the hollow composite sleeve are locked through a bolt, and a first wiring terminal is arranged on the back surface of the upper cover plate; the lower cover plate is arranged at the bottom end of the hollow composite sleeve, the lower cover plate and a connecting flange of the hollow composite sleeve are locked through a bolt, and a second wiring terminal is arranged on the surface of the lower cover plate; an L-shaped pressure monitoring channel is formed in the lower cover plate, one end of the pressure monitoring channel is communicated with the inner cavity of the hollow composite sleeve, the other end of the pressure monitoring channel extends to the side face of the lower cover plate, and a pressure monitoring meter is mounted at the end part of the pressure monitoring channel;
the capacitor core is arranged in the hollow composite sleeve, and the top end of the capacitor core is connected to the first wiring terminal of the upper cover plate through a wire; and the bottom end of the capacitor core is connected to the second wiring terminal of the lower cover plate through a wire.
2. The voltage sharing capacitor for the converter valve with the pressure monitoring device according to claim 1, wherein: the capacitor core is arranged on the lower cover plate through the connecting frame; the lead on the capacitor core is connected with the wiring terminal in a cold welding mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222634515.XU CN218602266U (en) | 2022-10-09 | 2022-10-09 | Voltage-sharing capacitor with pressure monitoring device for converter valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222634515.XU CN218602266U (en) | 2022-10-09 | 2022-10-09 | Voltage-sharing capacitor with pressure monitoring device for converter valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218602266U true CN218602266U (en) | 2023-03-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222634515.XU Active CN218602266U (en) | 2022-10-09 | 2022-10-09 | Voltage-sharing capacitor with pressure monitoring device for converter valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218602266U (en) |
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2022
- 2022-10-09 CN CN202222634515.XU patent/CN218602266U/en active Active
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