JP4337455B2 - Capacitor - Google Patents

Description

  The present invention relates to a protection device for a power capacitor used for power factor improvement and a capacitor for electrical equipment used in various electric circuits.

  Conventionally, the structure of a protection device for a power capacitor or an electric device capacitor used in various electric circuits has a configuration example such as a capacitor provided with a safety device or a gas-insulated metalized film capacitor (for example, Patent Document 1). , Patent Document 2 and Patent Document 3).

  Hereinafter, the configuration will be described with reference to FIGS.

  As a conventional capacitor equipped with a safety device, for example, as shown in FIG. 12, a capacitor element or a capacitor element assembly 38 is housed in a case 39, and the current passage is utilized by utilizing the case deformation due to an increase in internal pressure at the time of internal failure. Some have a security device 40 for cutting 41.

  In addition, the conventional example shown in FIG. 12 includes a pressure switch 42 that detects a rise in internal pressure in the capacitor case 39 and operates as a contact, separately from the safety device 40. The pressure switch 42 can set the operating pressure to a predetermined set value. In this capacitor, the pressure is set lower than the operating pressure of the safety device 40 and the abnormality is detected before the safety device 40.

  Further, as shown in FIG. 13, a gas-insulated metallized film capacitor provided with a security device in another conventional example accommodates a metallized film capacitor element and is filled with an insulating gas and one of the containers 30. The hole 31 formed in the part, and the cross-section which is fixed to the container 30 so as to close the hole 31 and has a weak point part near the center, is opposed to the reversible metal pressure release plate 32 having a substantially M shape. A mounting plate 36 attached to the container 30 and an intermediate metal fitting 35 provided with a sharp and through-hole mounted on the mounting plate 32 against the weak point 34 of the pressure release plate 32 are provided. It is equipped with a security device.

Further, as shown in FIGS. 14 and 15, a capacitor having another conventional safety device is a case in which a capacitor element or a capacitor element assembly 17 is housed in a case 18 and the internal pressure of the case 18 increases due to an internal failure. In a capacitor having a safety device 20 made of an insulating plate, a lead plate and a metal fitting that cuts the current path by utilizing the deforming force of 18, the connecting rod 29 and the safety device attachment metal fitting 19 attached to the inner wall of the case 18 are provided. The safety device 20 supported via the spring 26, the lower part supported by the connecting rod 29, the lower part supported by the movable element mounting bracket 27 attached to the inner wall of the case 18 via the spring 26, and the above A part of the case 18 is provided with a viewing window 24 for visually observing the movement of the movable element 28 by a spring force when the safety device 20 is operated. It is equipped with a security device that.
Japanese Utility Model Publication No. 6-27941 (FIG. 1) Japanese Utility Model Publication No. 3-95616 (FIGS. 1 and 2) Japanese Examined Patent Publication No. 7-24250 (FIGS. 1 and 4)

  However, the conventional techniques described above have the following problems.

  First, the conventional capacitor shown in FIG. 12 is provided with a pressure switch 42 that operates at a pressure lower than the operating pressure of the safety device 40. When an abnormality occurs in the capacitor element 38, the internal pressure rises due to an internal failure. Using the deformation, an abnormality is detected before the safety device 40 that cuts the current path 41. As a result, the capacitor can be opened from the power source, displayed as a lamp, and an alarm can be issued, and it is possible to prevent the occurrence of a failure such as a decrease in power factor without noticing the operation of the security device when the capacitor fails.

  However, in this configuration, the contact point of the pressure switch must be connected to the operating power supply in series with the circuit in which the trip coil of the capacitor power supply opener and the indicator light, etc. are connected in parallel. It is necessary to separately install a tripping circuit up to this time, and at the same time, the tripping circuit may not operate for some reason.

  In this case, the safety device operates and the faulty capacitor should be shut off in advance. However, there may be a case where the safety device does not operate due to a problem in manufacturing the safety device itself.

  In the unlikely event of a failure of the safety device or pressure switch that should be protected, the protection and notification functions are lost, the pressure rises due to the destruction gas of the capacitor, and eventually the metal case bursts. There is a worst-case danger. At that time, if there is a manager in the vicinity of the failed capacitor, the failure may be recognized due to the swelling of the case, but there is a risk of further personal injury if it is about to break.

  Further, the gas-insulated metallized film capacitor provided with the conventional security device of FIG. 13 accommodates the metallized film capacitor element and has a container 30 filled with an insulating gas and a hole 31 formed in a part of the container 30. And an attachment attached to the container 30 so as to oppose the reversible metal release plate 32 having a substantially M-shaped cross section in which a weak point is formed in the vicinity of the center and is fixed to the container 30 so as to close the hole 31 A gas insulation provided with a safety device, comprising a plate 36 and a center metal fitting 35 provided with a sharp and through-hole mounted on the mounting plate 32 against the weak point 34 of the pressure release plate 32. Since it is a metallized film capacitor, as described above, even when the protective device does not operate in the unlikely event, the breaking gas pressure inside the capacitor is released to the outside, and the worst case of the metal case is ruptured. It is avoided. However, in this case, since the notification function using the protective device and pressure contact has already failed, the administrator cannot be immediately notified of the failure, and the failure such as a power factor decrease due to a capacitor failure. Will be generated.

  Further, the generated gas is generally harmful because it is generated by burning the capacitor element. That is, even when a breakdown gas is released due to a failure, it is necessary to notify immediately, but these proposals do not have sufficient functions.

  Further, the capacitor having the conventional security device shown in FIGS. 14 and 15 stores the capacitor element or the capacitor element assembly 17 in the case 18 and uses the deforming force of the case 18 due to the increase in the internal pressure of the case 18 when an internal failure occurs. Then, in the capacitor having the security device 20 including the insulating plate, the lead plate, and the metal fitting for cutting the current path, the capacitor is supported on the security device fitting 19 attached to the inner wall of the case 18 via the connecting rod 29 and the spring 26. The safety device 20, the lower part is connected to the connecting rod 29, the lower part is supported by a movable element mounting bracket 27 attached to the inner wall of the case 18 via a spring 26, and a part of the case 18. And a viewing window 24 for visually observing the movement of the movable element 28 by a spring force when the safety device 20 is operated. Since a capacitor having a location, visual confirmation from outside the operating state of the safety device can be easily, it is convenient in maintenance. Like conventional capacitors, it is left unattended and does not cause a decrease in power factor.

  However, in this proposal, it is necessary to install a viewing window for visual confirmation, and this viewing window needs to be formed of a material such as glass that can confirm the inside. These materials are generally poor in mechanical strength, resulting in the formation of weak spots in the capacitor. The viewing window may be destroyed by transportation or slight impact, and the capacitor function itself may be lost. Even if it functions normally, it is necessary for the administrator to check the operation from the sight glass by inspection, and as mentioned above, in the situation where the protective device fails, there is no sufficient notification function and fail-safe It was insufficient from the viewpoint.

In order to solve the above problems, the capacitor of the present invention includes one or a plurality of capacitor elements, a metal case containing the capacitor elements and filled with gas, and a gas attached to and filled with the metal case. And a pressure release valve for releasing the internal pressure when the gas pressure reaches the pressure, the pressure release valve has a pressure release path having a portion in which a passage width through which the gas passes is narrowed, and a warning sound is generated by the gas passing through the pressure release path. It is made to generate.

In addition, the capacitor of the present invention includes one or a plurality of capacitor elements, a metal case containing the capacitor and liquid-impregnated inside, and a metal case attached to the metal case. When the inside reaches a predetermined pressure, the internal pressure is released. A condenser having a pressure valve, wherein the pressure relief valve has a pressure relief path that is attached to a portion that becomes the top surface of the metal case when the capacitor is installed, and has a portion that narrows a passage width through which gas passes. A warning sound is generated by the gas passing through the pressure release path.

  As described above, according to the present invention, even when the capacitor element is broken and the capacitor protection device is abnormal and the breaking gas pressure of the capacitor element increases, the gas pressure is set to a predetermined value. Since sound is generated by the outflow of gas when the pressure is released and released, it is possible to widely notify the abnormality of the capacitor.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
1 is a cross-sectional view of the internal structure of the capacitor in the present embodiment, FIG. 2 is a cross-sectional view of the internal structure of the pressure relief valve, and FIG. 3 is a view of the pressure relief valve 5 as viewed from the side.

  The capacitor in the first embodiment shown in FIG. 1 is provided with a sealed case by a metal case 1, a plurality of capacitor elements 3 are accommodated therein, arbitrary wiring is performed by connection lines 4, and external connection is performed by connection lines 4 and insulators 2. It is the structure pulled out to. At this time, the inside is filled with an insulating gas 7.

  The insulating gas 7 may be any gas as long as it has insulating performance. However, as an example in the present embodiment, evaluation was performed using sulfur hexafluoride gas, nitrogen gas, helium gas, or the like.

  In the present embodiment, the connection line 4 is represented as a three-phase star connection, but a three-layer delta connection or a single-phase connection may be used.

  Further, a pressure contact 6 and a pressure release valve 5 are provided on the side portion of the metal case 1 so as to maintain hermeticity. And these pressure contact 6 and the pressure relief valve 5 are accommodated in the attachment protection box 1a. The protective box 1a is not airtight. Further, the pressure contact 6 is for detecting that the internal pressure of the metal case is increased and the case is deformed to cut off the energization to the capacitor element. In the present embodiment, the pressure contact 6 Even when the valve does not operate due to a failure or the like, the internal pressure is released to the outside by the pressure release valve 5.

  Next, the pressure release valve 5 will be described in detail with reference to FIG. As shown in FIG. 2, the pressure relief valve 5 of the capacitor in the present embodiment is attached to a through hole provided in the side portion of the metal case 1. At this time, in order to maintain confidentiality inside the metal case 1, it is fixed by soldering, brazing, welding or the like so that there is no gap between the pressure relief valve 5 through-hole provided in the metal case 1 and the pressure relief valve 5. is doing.

  Further, the internal configuration of the pressure release valve 5 is as shown in FIG. 2, and a spring 5a and a truncated cone-shaped valve 5b are built in the central portion of the pressure release valve 5 so that the gas in the metal case 1 has a predetermined pressure. Then, the valve 5b compresses the spring 5a by the gas pressure, and the gas pressure release path 8 is opened. The gas pressure release device of the present embodiment is configured by combining the spring 5a and the valve 5b as described above, so that the gas passing through the pressure release path 8 flows from the inside of the metal case 1 to the outside. Works only in directions. The passage width of the pressure release passage 8 through which the gas passes is narrower than the passage width of the portion where the spring 5a is located, the portion of the passage immediately before the gas goes out. As described above, by narrowing a part of the pressure release path 8, a gas pressure change is generated on the path of the pressure release gas, and a sound due to the gas pressure release is generated.

  FIG. 3 is a side view of the pressure release valve 5 according to the present embodiment. A circular portion located at the center indicated by reference numeral 8 is a pressure release path when the gas is released, and the gas is The part immediately before going out is shown. In the present embodiment, the cross-sectional shape of the pressure release path 8 is created as a circle. However, if there is no problem in processing, there is no problem in the pressure release characteristics even in other shapes.

  In this way, when the pressure in the metal case 1 increases, the spring 5a is actuated to open the pressure release path 8, so that the capacitor element 3 should be destroyed and installed in the capacitor. Even if the pressure contact 6 and other protective devices (not shown) are inoperable, the pressure increase due to the breaking gas generated inside the capacitor can be released to the outside at a predetermined pressure.

  Further, in the present embodiment, when the released gas released at that time passes through the pressure release path 8, the pressure release valve 5 uses the flow of the gas to generate a sound close to the sound of a whistle. This sound makes it possible to notify more reliably that an abnormal condition has occurred in the capacitor, so that the administrator can take quicker measures, improve the safety of the entire power facility, improve the power quality, Safety can be improved.

The operation set values of the pressure contact 6 and the pressure release valve 5 in FIGS. 1, 2, and 3 of the present embodiment are as follows. That is, the pressure contact 6 was set in a range of 9.8 ± 0.1 (N / cm ² ), and the pressure release valve was set in a range of about 14.7 ± 0.1 (N / cm ² ), about 1.5 times that. This pressure setting is due to the following reason. That is, in order to recognize that the capacitor internal gas pressure is in an abnormal state, it is necessary to consider the variation in the environmental temperature in the general use state. In general, the upper limit of the operating temperature of this type of capacitor is 50 ° C., and the pressure increase due to the temperature at this time varies depending on the capacitor volume, but generally increases by about 1.96 to 3.92 (N / cm ² ). To do. Furthermore, even when an abnormal use state is assumed and the temperature is about 80 ° C., the pressure rise is about 3.92 to 6.86 (N / cm ² ). Therefore, the set value of the pressure contact 6 for protecting the capacitor is generally set to 9.8 ± 0.1 (N / cm ² ) as described above.

When the pressure contact 6 does not operate by setting the operation setting value of the pressure release pressure of the pressure release valve 5 to 14.7 ± 0.1 (N / cm ² ) with respect to the set value set at the pressure contact 6 It is possible to minimize the time for starting the pressure release from the pressure rise curve, and to prevent malfunction of the pressure release valve 5 even when the pressure contact 6 operates normally. .

  Furthermore, in the present embodiment, the pressure release valve 5 has a configuration in which a part of the pressure release path 8 is narrowed so that a gas pressure change is generated on the path of the pressure release gas and a sound due to the gas pressure release is generated. By doing so, it is made to operate only in an abnormal state where a general protective device does not operate, and a gas close to the whistle is emitted using the gas released in such an abnormal state. Can inform the administrator of the abnormality.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIG. FIG. 4A shows an internal structure sectional view of the pressure release valve in the present embodiment, and FIG. 4B shows a cross-sectional shape of the pressure release path 8 of the pressure release valve.

  In the present embodiment, the sectional shape of a part of the pressure release path 8 of the pressure release valve 5 shown in the first embodiment, which is narrowed, is partially changed, and as shown in FIG. A gas path excluding portion 8a that does not allow the gas to flow is provided in a portion close to the outlet of 8 to narrow the gas passage. In addition, in FIG. 4, although the cross section of the gas path | route exclusion part 8a has shown the sector shape of about 1/4 circle, it is good also as a sector shape of 1/4 to 3/4 circle. In addition, the gas path excluding portion 8a is about 1/4 of the narrowed portion of the pressure relief path 8 and is provided on the side close to the outlet. The purpose of installing the gas path excluding portion 8a is a warning. In order to adjust the volume and sound quality, the installation width and the installation position may be appropriately changed.

  Furthermore, in FIG. 4, although the cross section of the gas path | route exclusion part 8a is made into fan shape, as shown in FIGS. 5-7, a cross-sectional shape can also be variously changed.

  That is, in the embodiment in FIG. 5, the basic cross-sectional shape of the pressure release path 8 is circular, and the cross section of the gas path excluding portion 8a is rectangular.

  In the embodiment in FIG. 6, the basic cross-sectional shape of the pressure release path 8 is circular, and the cross section of the gas path excluding portion 8a is rectangular.

  In the embodiment shown in FIG. 7, the basic cross-sectional shape of the pressure release path 8 is circular, and the cross section of the gas path excluding portion 8a is triangular.

  By taking these shapes in the pressure relief path, the capacitor element 3 is destroyed, and even if the pressure contact 6 installed in the capacitor and other protective devices are inoperable, the capacitor The pressure increase due to the destruction gas generated inside can be released to the outside at a predetermined pressure, and the release valve at that time can generate a sound close to the sound of a whistle. By notifying the capacitor that an abnormal state has occurred more reliably than the generation of this sound, the administrator can take quicker measures and improve safety.

(Embodiment 3)
In this embodiment, as shown in FIG. 8, the cross-sectional shape of the pressure release path 8 of the pressure release valve 5 in the second embodiment is particularly semicircular. FIG. 8 is a diagram showing a cross-sectional shape of the pressure release path 8, and a portion indicated by reference numeral 8 a indicates a gas path excluding portion where gas is not circulated.

  The example shown in FIG. 8 is an example in which the cross-sectional shape of the pressure release path of the pressure release valve in the present embodiment is a semicircular shape. With this configuration, the pressure increase due to the breaking gas generated inside the capacitor is a predetermined pressure. And the pressure release valve generates a sound close to the sound of a whistle.

  It has been confirmed by experiments that the cross-sectional shape of the pressure release path is made semicircular in this way and approximates the shape of the whistle blowing portion, resulting in more effective sound quality.

  This is because the cross-section of the pressure release path is semicircular, and a pressure difference during gas discharge occurs between both ends of the semicircular shape and the central part of the semicircular shape. It has become. For this reason, the effect which the notification effect at the time of abnormality improves more is brought about.

  Further, FIG. 9 shows the path width in Embodiments 1 to 3 so that the sound generated when the gas passes through the part where the pressure release path portion of the pressure release valve narrows the passage is between about 10 Hz and about 100 kHz. This indicates whether or not the inspector has recognized the sound when it is heard. The frequency of the sound generated on the horizontal axis and the confirmation when the sound is heard on the vertical axis. It is graphed as a percentage. In addition, this test | inspection is the result of investigating whether it can confirm in the place which is 10 m away by adjusting the path | route width of a pressure release path | route part, generating a sound with various frequencies, and 10 testers.

  As a result, as shown in FIG. 9, the recognition rate exceeded 50% from frequencies exceeding 50 Hz, and the recognition rate was almost 100% around 1 kHz. It was found that when the frequency was further increased, the recognition rate decreased and decreased to 50% at 20 kHz.

  From this, when the path width is set so that the frequency of the generated sound is between 50 Hz and 20 kHz, the recognition rate of the generated sound is good, and it is possible to notify an abnormal state to more people. The safety is further improved.

  In the present embodiment, the installation position of the gas path exclusion portion 8a having a semicircular cross section is provided at the position shown in FIG. 4 as in the second embodiment. However, as described in the second embodiment, the installation width and the installation position may be appropriately changed in order to adjust the volume and sound quality.

(Embodiment 4)
FIGS. 10 and 11 show an embodiment of the wet capacitor of the present invention, and show a cross-sectional view of the internal structure of the capacitor in the present embodiment. In FIG. 10 showing the present embodiment, the same components as those described in the first to third embodiments are denoted by the same reference numerals, and redundant description is omitted.

  In the first to third embodiments, the case where the metal case is filled with the insulating gas has been described. However, in the present embodiment, the filled insulating gas is the insulating oil 15. The structure is the same, a sealed case is provided by the metal case 1, a plurality of capacitor elements 3 are accommodated therein, arbitrary wiring is performed by the connection lines 4, etc., and the connection line 4 and the insulator 2 are pulled out to the outside. Yes.

  The insulating oil filled in the interior at this time may be any oil as long as it has insulating performance. In the present embodiment, the connection line is represented as a three-phase star connection, but a three-layer delta connection or a single-phase connection may be used. Further, as shown in FIG. 10, a pressure contact 6 is provided on the side of the metal case 1 so as to keep hermeticity, and is housed inside the mounting protection box 1a. The protective box 1a may not be airtight.

  And in this Embodiment, while installing the pressure release valve 5 in the part used as the top | upper surface of the metal case 1 at the time of installation of the wet capacitor | condenser of this Embodiment, the gas reservoir part 14 is provided and the path | route along which gas passes is provided. A pressure relief path portion with a narrow passage width is provided to generate a sound when gas passes through the pressure relief path. In addition, since the structure of the part which narrowed the passage width | variety and the effect | action etc. in the middle of the path | route through which this gas passes are the same as the content demonstrated in Embodiment 1-3, the overlapping description is abbreviate | omitted.

  Next, with reference to FIG. 11, an operation when the wet capacitor according to the present embodiment has an abnormality in the capacitor element 3 will be described. In this case, the abnormality occurs in the case where an abnormality occurs in the capacitor element 3, the case internal pressure increases, the electric contact cannot be interrupted due to the failure of the pressure contact 6, and the abnormal state cannot be avoided. Assumed.

  In FIG. 11, breakdown occurs in the central element of the capacitor element 3, and breakdown gas 16 is generated. This destruction gas 16 accumulates in the upper part inside the capacitor case 1. The destruction gas 16 accumulates in the gas reservoir portion 14 installed on the upper surface of the capacitor case, and accumulates in the upper part of the capacitor case 1 as the gas generation continues. The internal pressure rises as the destructive gas 16 accumulates, and when the predetermined pressure is reached, the destructive gas 16 is released from the pressure release valve 5 through the path in the pressure release valve 5 to the outside. At this time, as shown in the first to third embodiments, the pressure release valve is provided with a portion with a narrow passage width in the middle of the gas path by making the cross section various shapes, which resembles the sound of a whistle. The sound can be emitted.

  At this time, as the pressure increases, the metal case 1 of the capacitor swells, so that the oil level gradually decreases. Therefore, even if the internal gas is released, the internal oil is rarely released to the outside. However, since a little bit of oil is ejected, a protective box 5c is provided around the discharge valve.

  With such a configuration, even in a wet capacitor, the capacitor element 3 is destroyed, and the pressure contact 6 and other protective devices (not shown) installed in the capacitor are inoperable. However, the pressure increase due to the breaking gas generated inside the capacitor is released to the outside at a predetermined pressure. The pressure release valve has a mechanism for generating a whistle-like sound by the released gas at that time. By more reliably informing the capacitor that an abnormal condition has occurred due to this generated sound, the manager can take quicker measures, improving the safety of the entire power supply facility, improving the power supply quality, Can improve safety.

  In the first to fourth embodiments, a plurality of examples of capacitor elements built in the metal case are shown. However, the embodiment of the present invention can be applied even if there is a single capacitor element, and the same effect is brought about. be able to.

  In the first to fourth embodiments, the time loss until notification in the case of an abnormality in the protective device is reduced, a sound that is easy to notify is generated, and a sound having a frequency that can be recognized by any person. By doing so, the recognition rate can be improved.

  In addition, the conventional pressure relief valve was the final safety device that was generally used only for the gas insulation type, but as shown in the fourth embodiment, it can also be applied to a wet type in which a metal case is filled with a liquid. In addition, the above-described effects can be obtained equivalent to the gas insulation method.

  As described above, the fail-safe technique of the first to fourth embodiments described above increases the safety of the capacitor and makes it possible to minimize damage even in the unlikely event.

  INDUSTRIAL APPLICABILITY The present invention is useful for an electrical device such as a capacitor, particularly a power capacitor used for power factor improvement and a protective device for a capacitor for electrical devices used in various electric circuits.

Sectional drawing of the internal structure of the capacitor according to the first embodiment of the present invention Cross-sectional view of the internal structure of a pressure relief valve in an embodiment of the present invention The pressure relief valve in the same embodiment as seen from the side (A) Cross-sectional view of internal structure of pressure release valve in second example of embodiment (b) A diagram showing a cross-sectional shape example of a pressure release path portion of the pressure release valve The figure which shows the 2nd cross-sectional shape example of the pressure release path | route part of the pressure release valve The figure which shows the 3rd cross-sectional shape example of the pressure release path | route part of the pressure release valve The figure which shows the 4th cross-sectional shape example of the pressure release path | route part of the pressure release valve The figure which shows the 5th cross-sectional shape example of the pressure release path | route part of the pressure release valve Graph of sound frequency and degree of recognition Cross-sectional view of the internal structure of the capacitor in the third example of the embodiment of the present invention Cross-sectional view of internal structure in the case of capacitor destruction in the third example of the embodiment of the present invention The figure which shows the 1st example of the conventional capacitor | condenser The figure which shows the 2nd example of the conventional capacitor | condenser The 1st figure which shows the 3rd example of the conventional capacitor | condenser 2nd figure which shows the 3rd example of the conventional capacitor | condenser

Explanation of symbols

1 Metal Case 3 Capacitor Element 5 Pressure Release Valve 7 Insulating Gas 8 Pressure Release Path 8a Gas Path Exclusion Section

Claims (10)

One or a plurality of capacitor elements, a metal case containing the capacitor element and filled with gas, and a pressure release valve attached to the metal case and releasing the internal pressure when the filled gas reaches a predetermined gas pressure The pressure release valve has a pressure release path having a portion in which a passage width through which the gas passes is narrowed, and a warning sound is generated by the gas passing through the pressure release path. A capacitor having one or a plurality of capacitor elements, a metal case incorporating the capacitor and liquid-impregnated inside, and a pressure release valve attached to the metal case and releasing the internal pressure when the inside reaches a predetermined pressure. The pressure relief valve is attached to a portion that becomes the top surface of the metal case when the capacitor is installed, and has a pressure relief path having a narrowed passage width through which gas passes, and passes through the pressure relief path. Capacitor that generates a warning sound by gas. The capacitor according to claim 1 , wherein a cross-sectional shape of at least a part of the pressure release path is a fan shape. 4. The capacitor according to claim 3, wherein a cross-sectional shape of at least a part of the pressure release path is a sector shape of a quarter circle to a quarter circle. The capacitor according to claim 1 , wherein a cross-sectional shape of at least a part of the pressure release path is a semicircular shape. The capacitor according to claim 1 , further comprising a gas path excluding portion that does not allow gas to pass through at least a part of the pressure releasing path, wherein the gas path excluding portion has a quadrangular cross-sectional shape. 3. The capacitor according to claim 1 , further comprising a gas path exclusion portion that prevents gas from passing through at least a part of the pressure release path, wherein the gas path exclusion portion has a rectangular cross-sectional shape. 3. The capacitor according to claim 1 , further comprising a gas path excluding portion that prevents gas from passing through at least a part of the pressure relief path, wherein the gas path excluding portion has a triangular cross-sectional shape. The capacitor according to any one of claims 1 to 8 , wherein the pressure relief valve is opened at 14.7 N / cm ² or more. The capacitor according to any one of claims 1 to 9 , wherein the pressure release valve is configured such that a warning sound generated by gas passing through the pressure release path is between 50 Hz and 20 kHz.

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