JP2004129344A - Gas-blast circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas-blast circuit breaker for excellent reliability and economy capable of accurately understanding the state of an equipment for timely maintenance according to actual state of the equipment while a line is hot. <P>SOLUTION: A body of a gas tank 1 is attached with a grease degradation diagnosing device 6 which comprises an observation window 7 and a grease holder 8. The observation window 7 is arranged vertical to the body of the gas tank 1. The grease holder 8 is arranged horizontally in the gas tank 1, and coated with the same grease 14 as that used for a contact of an arc-extinguishing chamber 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a gas circuit breaker used in a substation or a switchyard of a power system, and more particularly to a gas circuit breaker having a diagnostic function for determining a maintenance time.
[0002]
[Prior art]
Maintenance is indispensable for operating the gas circuit breaker in good condition. However, as shown in FIG. 19, since the arc-extinguishing chamber 2 to be maintained is housed in the gas tank 1 in which the arc-extinguishing gas is sealed, the situation cannot be directly seen from the outside in a live state. For example, grease is applied to the sliding portion between the contacts inside the arc-extinguishing chamber 2, but it is impossible to directly see the state of the grease. Therefore, irrespective of the quality of the grease, regular internal inspections are performed while the line is stopped, and the grease is increased. As described above, in the related art, it is general that the maintenance is determined on a regular basis by setting the criteria for performing the maintenance such that the cumulative breaking current reaches the reference value and when 12 to 18 years have passed since the installation. It was a target.
[0003]
[Patent Document 1]
JP-A-2002-260502
[Problems to be solved by the invention]
However, in practice, individual differences between devices are large, and maintenance may not be required even after 12 years or more. Conversely, if the grease applied to smoothly slide the contacts in the arc-extinguishing chamber or the insulation deterioration due to sliding powder is severe, maintenance must be performed before the cumulative breaking current reaches the reference value. Sometimes it is necessary. In order to realize safe and stable power supply, the timing of maintenance is extremely important. In addition, it is desirable from a viewpoint of economy to omit maintenance of normal equipment. For this reason, in recent years, there has been a demand for timely maintenance that is not performed periodically according to a determination criterion, but is performed only when an abnormality occurs in the device according to the state of the device.
[0005]
The present invention has been proposed in view of such circumstances, and an object of the present invention is to enable the state of equipment to be accurately grasped in a live state without stopping power supply, and to be timely adapted to the actual equipment state. It is an object of the present invention to provide a gas circuit breaker which is excellent in reliability and economy by performing a proper maintenance.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an arc-extinguishing chamber having a fixed contact and a movable contact that can be freely contacted and detached in a gas tank at a ground potential, fills with an insulating gas, and further operates the movable contact. A gas circuit breaker driven by a mechanism has the following technical features.
[0007]
In the invention of claim 1, grease is applied to the arc-extinguishing chamber in order to smoothly slide the contacts, and a grease deterioration diagnostic device is attached to the gas tank. It is characterized by comprising a grease holder to which the same grease as the grease used for the arc chamber is applied, and an observation window for observing the grease applied to the grease holder.
In the ninth aspect of the present invention, a foreign substance monitoring device is attached to the gas tank, and the foreign substance monitoring device includes a foreign substance trap for collecting foreign substances in the gas tank, and an observation window for observing the foreign substances collected in the foreign substance trap. It is characterized by becoming.
[0008]
A twelfth aspect of the invention is characterized in that a load measuring probe is attached to at least one location on the bottom surface of the gas tank.
Further, the invention of claim 13 is characterized in that a microphone is mounted in a storage box of the operation mechanism or in the gas tank.
[0009]
According to the present invention having the above-described configuration, the state of grease or foreign matter in the grease holder or the foreign matter trap is monitored from the observation window, or the operating load is measured by the load measuring probe, and further, the operation load from the microphone is measured. Through the work of analyzing the operation sound, it is possible to determine whether the device is normal or abnormal even in the live state. As a result, timely maintenance that is similar to the actual device state can be performed. As a result, good operability can be maintained and reliability is improved. In addition, since maintenance does not need to be performed while the device is operating normally, the cost required for maintenance can be reduced, which is economical.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an example of an embodiment according to the present invention will be described with reference to the drawings and reference numerals in the drawings. In the following embodiment, grease is applied to the arc-extinguishing chamber 2 in order to smoothly slide the contacts. In addition, the same reference numerals are given to the same or corresponding parts as the constituent parts described in the related art, and description thereof will be omitted.
[0011]
(First Embodiment)
(Constitution)
The first embodiment is an application of the gas circuit breaker according to the first aspect of the present invention. FIG. 1 is a cross-sectional view showing the first embodiment, and FIG. 2 is an essential part of the first embodiment. FIG. A grease deterioration diagnosis device 6 is attached to the body of the gas tank 1. The grease deterioration diagnostic device 6 includes an observation window 7 and a grease holder 8. The observation window 7 is arranged perpendicular to the body of the gas tank 1. The grease holder 8 is disposed horizontally in the gas tank 1, and the same grease 14 as the grease used for the contact portion of the arc-extinguishing chamber 2 is applied.
[0012]
(Effect)
As described above, conventionally, in the live state, it is impossible to directly see the state of grease applied to the sliding portion inside the arc-extinguishing chamber 2 housed in the gas tank 1 in which the arc-extinguishing gas is sealed. Was. On the other hand, in the present embodiment, the quality of the grease 14 can be determined by directly viewing the color or the like of the grease 14 applied to the grease holder 8 from the observation window 7.
[0013]
Therefore, it is possible to determine the state of the grease 14 in the live state. As a result, timely maintenance can be performed according to the state of the grease 14 of the gas circuit breaker. As a result, a stable operation state can be maintained for a long time, and the reliability is improved. Moreover, as long as the state of the grease 14 is good, there is no need to perform maintenance, so that the number of times of maintenance can be minimized and the cost can be reduced.
[0014]
(Second embodiment)
(Constitution)
The second embodiment is an application of the gas circuit breaker according to the second aspect of the present invention, and FIG. 3 is a cross-sectional view of a main part of the second embodiment. As shown in FIG. 3, the grease holder 8 is provided with a pair of electrodes 8a, and the terminals of the electrodes 8a are drawn out of the gas tank 1 through the gas-tight insulating terminals 32.
[0015]
(Effect)
According to the second embodiment, the insulation resistance of the grease 14 applied to the grease holder 8 can be measured using the gas-tight insulation terminal 32. Therefore, the electrical evaluation can be performed by comparing the resistance value of the grease 14 in a normal state and the measured resistance value to determine a change in the resistance value due to the deterioration of the grease 14. That is, similarly to the first embodiment, it is possible to determine the state of the grease 14 in a live state, and to perform timely maintenance, thereby improving reliability and economy.
[0016]
(Third embodiment)
(Constitution)
The third embodiment is an application of the gas circuit breaker according to the third and fourth aspects of the present invention. FIG. 4 is a cross-sectional view of a main part of the third embodiment, and FIG. It is a front view of a contact surface. As shown in FIG. 4, a probe 9 is attached to the grease deterioration diagnostic device 6 via a packing 11 capable of sealing an insulating gas. The probe 9 can be operated from the outside of the gas tank 1, and is configured so that its tip is mechanically pressed against the surface of the grease 14 of the grease holder 8. A lattice-shaped pattern 9a (see FIG. 5A) and a concentric pattern 9b (see FIG. 5B) are provided on the contact surface of the tip of the probe 9 with the grease 14. Each of these patterns 9a and 9b has an uneven surface so that the pattern can be transferred to the grease 14 side. Furthermore, both the grease holder 8 and the probe 9 can be viewed directly from the observation window 7.
[0017]
(Effect)
In the third embodiment, the probe 9 is operated by operating the gas tank 1 from outside, and the tip of the probe 9 is pressed against the surface of the grease 14 of the grease holder 8. Then, the viscosity or the like of the grease 14 when the probe 9 is pressed is observed from the observation window 7. At this time, since the patterns 9a and 9b are formed on the contact surface of the probe 9 with the grease 14, the states of the patterns 9a and 9b appear on the grease 14 side. According to the third embodiment, in addition to the functions and effects of the above-described embodiment, there is an advantage that the state of the grease 14 can be grasped at a glance, and deterioration of the grease 14 can be quickly determined. is there.
[0018]
(Fourth embodiment)
(Constitution)
The fourth embodiment is one in which the gas circuit breaker according to the invention of claim 5 is applied, and FIG. 6 is a cross-sectional view of a main part of the fourth embodiment. As shown in FIG. 6, a pair of electrodes is formed between the grease holder 8 and the probe 9, and the grease holder 8 is provided with an insulating terminal 15 that is electrically insulated from the gas tank 1. The probe 9 is attached to the gas tank 1 via a seal flange 10 made of an insulating material and a packing 11 capable of sealing an insulating gas. Therefore, the probe 9 is electrically insulated from the gas tank 1 and can be operated mechanically from outside the gas tank 1. Both the grease holder 8 and the probe 9 can be directly viewed from the observation window 7.
[0019]
(Effect)
In the fourth embodiment having the above configuration, the probe 9 is operated from the outside of the gas tank 1 to apply a voltage while changing the gap between the grease holder 8 and the grease holder 8, so that the probe 9 is moved between the grease holder 8 and the probe 9. Can be measured. Therefore, it is possible to know the change in the electrical insulation performance due to the deterioration of the grease 14. Further, when a foreign substance adheres to the grease holder 8, it is possible to observe a change in the electrical insulation performance of the grease 14 in consideration of the influence of the foreign substance. According to such a fourth embodiment, the status of the device according to the state of the grease 14 can be grasped in detail, and the maintenance timing can be determined with high accuracy.
[0020]
(Fifth embodiment)
(Constitution)
The fifth embodiment is one in which the gas circuit breaker according to the invention of claim 6 is applied, and FIG. 7 is a cross-sectional view of a main part of the fifth embodiment. As shown in FIG. 7, the feature of the fifth embodiment is that a light-shielding protection plate 19 made of metal or the like is detachably attached to the outside (atmosphere side) of the observation window 7.
[0021]
(Effect)
In the fifth embodiment, by attaching the protective plate 19 to the observation window 7 except when observing the grease 14 of the grease holder 8, direct exposure of the grease 14 to external light can be restricted. Therefore, deterioration of the grease 14 due to external light can be suppressed, and the deterioration state of the grease 14 is similar to that of an actual device. For this reason, the timing at which the maintenance is performed is not shifted, and the reliability and economy are further improved.
[0022]
(Sixth embodiment)
(Constitution)
The sixth embodiment is an application of the gas circuit breaker according to the seventh aspect of the present invention, and FIG. 8 is a cross-sectional view of a main part of the sixth embodiment. The seventh embodiment is characterized in that the surface of the grease holder 8 on which the grease 14 is applied is arranged substantially vertically.
[0023]
(Effect)
In the sixth embodiment as described above, since the grease 14 of the grease holder 8 is arranged substantially vertically, gravity that is not affected by the substantially horizontal arrangement acts on the grease 14, and changes in the state of the grease 14 due to gravity. Can be observed. Therefore, the state of deterioration of the grease 14 becomes more similar to the actual equipment, maintenance can be performed at accurate timing, and excellent reliability and economy can be obtained.
[0024]
(Seventh embodiment)
(Constitution)
In the seventh embodiment, the gas circuit breaker according to the invention of claim 8 is applied, FIG. 9 is a cross-sectional view of the seventh embodiment, and FIG. 10 is a main part of the seventh embodiment. FIG. As shown in FIGS. 9 and 10, a grease deterioration diagnosis device 12 is installed in the gas tank 1. The grease deterioration diagnosing device 12 is provided with a simulated contact 13 of a fixed contact and a movable contact, which are similar in shape to the contact of the arc-extinguishing chamber 2 and can be separated. One end of the simulated contact 13 is configured to be operable from outside the gas tank 1. The same grease 14 as the grease used for the arc-extinguishing chamber 2 contact portion is applied to the sliding portion of the simulated contact 13. That is, in the seventh embodiment, the simulated contact 13 itself plays the role of the grease holder 8. The state of the grease 14 applied to the simulated contact 13 can be directly observed from the observation window 7. Further, a detachable load diagnosis device 33 is installed outside the grease deterioration diagnosis device 12.
[0025]
(Effect)
In the seventh embodiment having the above configuration, by operating one end of the simulated contact 13 from outside the gas tank 1, the state of the grease 14 of the sliding portion of the simulated contact 13 is directly observed from the observation window 7, and Can be determined. At the same time, the frictional force can be measured by attaching the load diagnosis device 33 when operating the simulated contact 13. When the grease in the sliding portion of the arc-extinguishing chamber 2 is deteriorated, so-called "galling" or the like occurs with an increase in frictional force. According to the seventh embodiment, such a defect is quantitatively evaluated. It becomes possible. Therefore, timely maintenance is possible, and it is possible to contribute to improvement in reliability and economy of the gas circuit breaker.
[0026]
(Eighth embodiment)
(Constitution)
The eighth embodiment is an application of the gas circuit breaker according to the ninth aspect of the present invention. FIG. 11 is a cross-sectional view of the eighth embodiment, and FIG. 12 is a main part of the eighth embodiment. FIG. As shown in FIGS. 11 and 12, a foreign body monitoring device 16 is provided on the body of the gas tank 1. The foreign substance monitoring device 16 includes a foreign substance trap 17 and an observation window 7. The foreign matter 29 deposited on the foreign matter trap 17 can be viewed directly from the observation window 7.
[0027]
(Effect)
According to the above-described eighth embodiment, the material, quantity and shape of the foreign matter 29 can be grasped by directly viewing the foreign matter 29 deposited on the foreign matter trap 17 from the observation window 7. For this reason, it is possible to accurately know the occurrence state of the foreign matter 29 which affects the breaking performance and the insulating performance of the gas circuit breaker in the hot wire state. Therefore, timely maintenance can be performed according to the situation of the foreign matter 29, and reliability and economy can be improved.
[0028]
(Ninth embodiment)
(Constitution)
The ninth embodiment is an application of the gas circuit breaker according to the tenth aspect of the present invention, and FIG. 13 is a cross-sectional view of a main part of the ninth embodiment. As shown in FIG. 13, the foreign matter trap 17 is made of an insulator, and has at least one pair of electrodes 17a. The electrode 17a is drawn out of the gas tank 1 from the foreign matter trap 17 by an airtight insulating terminal 30.
[0029]
(Effect)
In the ninth embodiment as described above, the behavior of the foreign matter 29 deposited on the foreign matter trap 17 can be observed from the observation window 7 with a voltage applied to both ends of the insulating terminal 30. It can be determined whether the foreign matter 29 is a conductive metal foreign matter or an insulator. Therefore, the occurrence state of the foreign matter 29 can be grasped more accurately, and maintenance can be performed without losing the timing.
[0030]
(Tenth embodiment)
(Constitution)
The tenth embodiment is an application of the gas circuit breaker according to the eleventh aspect of the present invention, and FIG. 14 is a cross-sectional view of a main part of the tenth embodiment. As shown in FIG. 14, the observation window provided in the gas tank 1 is composed of a plurality of transparent plates 18, and the outside atmosphere is communicated between the transparent plates 18 through the vent 31. In the embodiment of FIG. 14, the grease holder 8 is arranged as an observation target from the transparent plate 18 which is an observation window, but the foreign matter trap 17 may be used.
[0031]
(Effect)
In the tenth embodiment, since the observation window is provided from the plurality of transparent plates 18 through which the outside air passes through the gap, the observation inside the gas tank 1 should be performed during the observation of the grease holder 8 (or the foreign matter trap 17). Even if the pressure rises rapidly and the inner transparent plate 18 in contact with the gas is broken, the observer can be protected from the debris. Therefore, it is possible to ensure safety in the monitoring operation.
[0032]
(Eleventh embodiment)
(Constitution)
In the eleventh embodiment, the gas circuit breaker according to the twelfth aspect of the present invention is applied. FIG. 15 is a cross-sectional view of the eleventh embodiment, and FIG. 16 is a main part of the eleventh embodiment. FIG. As shown in FIGS. 15 and 16, the operating load diagnosis device 20 is installed on the leg 24 of the gas circuit breaker on the base 25. The load diagnosis device 20 is configured by supporting the gas circuit breaker by the block 22 by tightening the jack bolt 27, removing the mounting bolt 26, and mounting the removable probe 21.
[0033]
(Effect)
In the eleventh embodiment, in the load diagnosis device 20, the operating load of the gas circuit breaker is measured by the detachable probe 21, and the result is compared with the normal operating load and the measured operating load. Thus, it is possible to determine whether the device operation is normal or abnormal in the live state. As a result, the quality of the device can be easily determined, and timely maintenance can be performed according to the actual status of the device.
[0034]
(Twelfth embodiment)
(Constitution)
The twelfth embodiment is one in which the gas circuit breaker according to the invention of claim 13 is applied, and FIG. 17 is a cross-sectional view of the twelfth embodiment. The twelfth embodiment is characterized in that a detachable microphone 28 is mounted in a storage box of the operation mechanism 5 as shown in FIG.
[0035]
(Effect)
In the twelfth embodiment, the sound during the operation of the gas circuit breaker is collected by using the microphone 28, the sound frequency spectrum is analyzed, and the result is compared with that in the normal state. Thus, similarly to the eleventh embodiment, it is possible to easily determine whether the device operation is normal or abnormal in the live state, and to perform maintenance. As a modification of the twelfth embodiment, as shown in FIG. 18, the mounting position of the microphone 28 may be changed from the inside of the storage box of the operation mechanism 5 to the inside of the gas tank 1. The same operation and effect can be obtained.
[0036]
【The invention's effect】
As described above, according to the present invention, by monitoring the grease in the grease holder from the observation window, it is possible to accurately grasp the state of the device while maintaining the live state, and to timely reflect the actual device state. By performing a proper maintenance, a gas circuit breaker excellent in reliability and economy can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of a main part of the first embodiment.
FIG. 3 is a cross-sectional view of a main part of a second embodiment of the present invention.
FIG. 4 is a cross-sectional view of a main part according to a third embodiment of the present invention.
FIGS. 5A and 5B are front views of a contact surface of a probe with grease according to a third embodiment of the present invention.
FIG. 6 is a cross-sectional view of a main part of a fourth embodiment of the present invention.
FIG. 7 is a cross-sectional view of a main part according to a fifth embodiment of the present invention.
FIG. 8 is a cross-sectional view of a main part of a sixth embodiment of the present invention.
FIG. 9 is a cross-sectional view of a seventh embodiment of the present invention.
FIG. 10 is a cross-sectional view of a main part of a seventh embodiment.
FIG. 11 is a cross-sectional view of the eighth embodiment of the present invention.
FIG. 12 is a cross-sectional view of a main part according to an eighth embodiment of the present invention.
FIG. 13 is a cross-sectional view of a main part of a ninth embodiment of the present invention.
FIG. 14 is a cross-sectional view of a main part according to a tenth embodiment of the present invention.
FIG. 15 is a cross-sectional view of the eleventh embodiment of the present invention.
FIG. 16 is a cross-sectional view of a main part of an eleventh embodiment of the present invention.
FIG. 17 is a transverse sectional view of a twelfth embodiment of the present invention.
FIG. 18 is a cross-sectional view of a modification of the twelfth embodiment of the present invention.
FIG. 19 is a cross-sectional view of a conventional gas circuit breaker.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Gas tank 2 ... Arc extinguishing chamber 3, 4 ... Conductor 5 ... Operation mechanism part 6 ... Grease deterioration diagnosis device 7 ... Observation window 8 ... Grease holder 9, 21 ... Probes 9a and 9b ... Probe tip pattern 10 ... Seal flange DESCRIPTION OF SYMBOLS 11 ... Packing 12 ... Grease deterioration diagnosis device 13 ... Simulated contact 14 ... Grease 15 ... Insulation terminal 16 ... Foreign matter monitoring device 17 ... Foreign matter trap 18 ... Transparent plate 19 ... Protective plate 20 ... Operating load diagnosis device 24 ... Leg 28 ... Microphone 29 ... Foreign matter 30... Insulating terminals 31.

Claims (13)

In a gas circuit breaker having a configuration in which an arc-extinguishing chamber having a fixed contact and a movable contact that can be freely contacted and separated is housed in a gas tank at a ground potential and is filled with an insulating gas, and the movable contact is driven by an operating mechanism.
Grease is applied to the arc-extinguishing chamber to smoothly slide the contacts,
Attach a grease deterioration diagnostic device to the gas tank,
The grease deterioration diagnosis device is characterized in that it comprises a grease holder to which the same grease as the grease used for the arc-extinguishing chamber is applied, and an observation window for observing the grease applied to the grease holder. Gas circuit breaker. Providing at least one pair of electrodes on the grease holder,
2. The gas circuit breaker according to claim 1, wherein the terminal of the electrode is drawn out of the gas tank through a gas-tight insulating terminal. The gas circuit breaker according to claim 1, further comprising a probe that is operated from outside the gas tank and mechanically presses the grease surface of the grease holder. The gas circuit breaker according to claim 3, wherein a pattern having an uneven surface that can be transferred to the grease side is provided on a contact surface of the probe with the grease. Electrically insulating between the probe and the gas tank, and between the grease holder and the gas tank,
The gas circuit breaker according to claim 3 or 4, wherein a pair of electrodes is provided between the probe and the grease holder. The gas circuit breaker according to any one of claims 1 to 5, wherein a light-shielding protection plate is detachably disposed outside the observation window. The gas circuit breaker according to any one of claims 1 to 6, wherein a grease surface of the grease holder is arranged substantially vertically. The grease deterioration diagnostic device is provided with a simulated contact composed of a movable contact and a fixed contact that can be separated from and separated from the contact of the arc extinction chamber,
The gas circuit breaker according to any one of claims 1 to 7, wherein the simulated contact is configured such that one end thereof is operated from outside the gas tank. In a gas circuit breaker configured to house an arc-extinguishing chamber consisting of a fixed contact and a movable contact in a gas tank at a ground potential and fill with an insulating gas, and further drive the movable contact by an operation mechanism,
Attach a foreign substance monitoring device to the gas tank,
The gas circuit breaker, wherein the foreign substance monitoring device comprises a foreign substance trap for collecting foreign substances in the gas tank, and an observation window for observing the foreign substances collected in the foreign substance trap. The foreign matter trap is made of an insulator,
Providing at least one pair of electrodes in the foreign matter trap;
The gas circuit breaker according to claim 9, wherein the terminal of the electrode is drawn out of the gas tank. The gas circuit breaker according to claim 9, wherein the observation window includes a plurality of transparent plates, and a space between the transparent plates communicates with an external atmosphere. In a gas circuit breaker configured to house an arc-extinguishing chamber consisting of a fixed contact and a movable contact in a gas tank at a ground potential and fill with an insulating gas, and further drive the movable contact by an operation mechanism,
A gas circuit breaker, wherein a load measuring probe is attached to at least one portion of a bottom portion of the gas tank. In a gas circuit breaker configured to house an arc-extinguishing chamber consisting of a fixed contact and a movable contact in a gas tank at a ground potential and fill with an insulating gas, and further drive the movable contact by an operation mechanism,
A gas circuit breaker, wherein a microphone is mounted in a storage box of the operation mechanism or in the gas tank.

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