JP4686555B2 - Vacuum switchgear - Google Patents

Description

The present invention relates to a vacuum switch equipment, in particular regarding the preferred vacuum switchgear equipment to what has a function of diagnosing the soundness of the vacuum pressure in the vacuum valve during operation.

  In general, in a vacuum switching device, an electrode opening / closing operation is performed inside the vacuum vessel, and therefore the pressure inside the vacuum vessel (vacuum pressure) affects the withstand voltage performance and interruption performance of the device. FIG. 4 is a so-called Paschen curve showing the discharge characteristics in vacuum, and shows the correlation between the pressure and the discharge start voltage when the length of the vacuum insulation gap between the electrodes is 5 mm. As shown in the figure, the discharge start voltage depends on the vacuum pressure, and from this it can be seen that the withstand voltage performance and the cutoff performance in the vacuum vessel depend on the vacuum pressure. Therefore, the vacuum switchgear must periodically diagnose whether the vacuum pressure is appropriate, that is, the soundness of the vacuum pressure, in order to guarantee their performance.

  The soundness diagnosis of the vacuum pressure is carried out by diagnosing the soundness of the vacuum pressure based on the presence or absence of a flashing by applying a predetermined high voltage between the electrodes after the opening / closing part is carried out of the receiving board. . In this case, at the time of vacuum pressure diagnosis, the apparatus must be cut off, and a high voltage power source for applying a high voltage is required separately, which increases the burden at the time of diagnosis. In order not to increase the burden at the time of diagnosis, it is desirable to perform diagnosis during operation, that is, diagnosis without causing a power failure of the apparatus. For example, Patent Document 1 discloses a vacuum switching device that enables such diagnosis. There is something.

  In Patent Document 1, a measurement terminal for vacuum pressure diagnosis is arranged facing a metal container having a floating potential, and this measurement terminal is molded in an insulator together with the metal container. Is connected to a grounded capacitor, the voltage generated at both ends of the capacitor is compared with a preset threshold value by a comparator, and an alarm lamp which is turned ON / OFF by a relay contact operated by the output of the comparator A vacuum switchgear that uses and diagnoses the soundness of vacuum pressure is described.

  In the above-described apparatus, it is possible to diagnose the soundness of the vacuum pressure by allowing a diagnostician to visually check the alarm lamp at the time of periodic diagnosis.

JP 2007-80594 A

  However, for secondary substations (power receiving boxes installed on the shoulders) located in the immediate vicinity of consumers, the vacuum switchgear is covered with an outer box. It was necessary to enter the inside of the box, and it was difficult to diagnose the soundness of the vacuum pressure.

  Also, the opportunity to see the warning lamp is limited to a regular diagnosis once every few years. Therefore, if the vacuum pressure deteriorates and the alarm lamp continues to light for a long time, the alarm lamp itself deteriorates or breaks down during periodic diagnosis, resulting in oversight of the vacuum pressure deterioration and the reliability of the vacuum pressure diagnosis is impaired. There was a fear.

  Therefore, in the apparatus as described above, from the viewpoint of the fail-safe idea, a new inverting circuit is provided so that the signal voltage is ON when it is healthy and OFF when it is deteriorated, or a separate circuit for alarm lamp diagnosis is provided. As a result, the soundness of the alarm lamp must be diagnosed, the structure becomes complicated, and the cost is inevitably increased.

The present invention has been made in view of the above problems, purpose of that is to provide a vacuum switchgear which can be diagnosed soundness of easy vacuum pressure.

Vacuum switchgear of the present invention is to achieve the previous SL object, and the metal casing of the floating potential inside with at least one pair of main circuit consisting of fixed electrode and movable electrode in a vacuum, and the internal, the movable electrode An operation mechanism that opens and closes the fixed electrode, a bus that supplies power to the main circuit, and a cable that supplies power from the main circuit to the load side, and these are housed in a housing. In the vacuum switchgear, it is determined whether the main circuit is charged with first connection means to which the vacuum pressure diagnostic means for diagnosing the vacuum pressure in the metal container is detachably connected to the housing. The electrical connection diagnosis means includes second connection means to be detachably connected , and the first connection means and the second connection means have a common structure, and the vacuum pressure diagnosis means and the second connection means Electricity diagnosis means is the same means Characterized in that that.

  According to the vacuum switching device of the present invention, it is possible to easily diagnose the soundness of the vacuum pressure.

  Embodiments of the vacuum switchgear according to the present invention will be described below with reference to FIGS.

  As shown in FIGS. 1 and 2, the vacuum switching device 1 includes an opening / closing part 100, an operating mechanism 3 provided on the opening / closing part 100, for opening / closing an electrode of the opening / closing part 100, and the opening / closing part 100. Connected to the switching unit 100 to supply power to the switching unit 100, a cable 5 connected to the switching unit 100 to supply power from the switching unit 100 to the load side, and a metal made to house them inside And a housing 2.

  The above-described switch 100 includes a vacuum valve 101 for a circuit breaker and a disconnect switch, a vacuum valve 102 for a ground switch, a bus-side conductor 112 that connects the vacuum valve 101 and the bus 4, and a bus-side conductor. 112, a bushing 113 that connects the bus bar 4, a load-side conductor 116 that connects the vacuum valve 101 and the cable 5, a bushing 117 that connects the conductor 116 and the cable 5, and one end connected to the load-side conductor 116. And a voltage detecting capacitor 152 to be operated.

  A vacuum valve 101 having a cutoff and disconnection function installed in the opening / closing part 100 is housed in a metal container 12 having a floating potential inside the vacuum and the metal container 12, facing each other, and constituting a main circuit The pair of fixed electrodes 110 and 114 and the movable electrodes 120 and 121 are roughly configured. The fixed electrode 110 is supported by one end of the fixed conductor 111, and the other end of the fixed conductor 111 is connected to the bus-side conductor 112. The movable electrode 120 is supported by one end of the movable conductor 122, and the other end of the movable conductor 122 is connected to one side of the connecting conductor 124. The movable electrode 121 is supported by one end of the movable conductor 123, and the other end of the movable conductor 123 is connected to the other side of the connecting conductor 124 described above. The fixed electrode 114 is supported by one end of the fixed conductor 115, and the other end of the fixed conductor 115 is connected to the conductor 116.

  An arc shield 119 is disposed around the fixed electrode 110 and the movable electrode 120, and around the fixed electrode 114 and the movable electrode 121, respectively, and the arc shield 119 is sandwiched between insulating ceramic cylinders 118 covering the periphery of the electrodes. . The ceramic cylinder 118 is prevented by the arc shield 119 from attaching an arc emitted from the electrode when the movable electrode is turned on and off. The connection conductor 124 is connected to the operation rod 126 via the ceramic rod 125. A bellows 130 for operating the operating mechanism 3 while maintaining a vacuum state is provided between the operating rod 126 and the metal container 12, and the operating rod 126 projects to the outside of the vacuum valve 101. An end located on the opposite side to 125 is supported by an insulating rod 127 and connected to the operation mechanism 3.

  As shown in FIG. 2, each part of the opening / closing part 100 and the conductive terminal 50 for vacuum pressure diagnosis are molded integrally with an insulator 20 such as epoxy, and the vacuum valve 101 and the terminal 50 are insulated from each other. Has been. The terminal 50 is outside the metal container 12 and is disposed to face the metal container 12. A conductive coating 21 is applied to the surface of the insulator 20, and the conductive coating 21 is at a ground potential.

  On the other hand, the vacuum valve 102 for opening and closing the ground is schematically composed of an insulating ceramic cylinder 140, a fixed electrode 145 whose periphery is covered by terminal plates 141 and 142 located at both ends thereof, and a movable electrode 146 facing the fixed electrode 145. Has been. The fixed electrode 145 is supported by one end of the fixed conductor 143, and the other end of the fixed conductor 143 is connected to the conductor 116. The movable electrode 146 is supported by one end of a movable conductor 144 supported by the terminal plate 141 via a bellows 148, and a part of the movable conductor 144 is external to the ceramic cylinder 140 and the terminal plates 141 and 142. Protruding to The bellows 148 follows the movement of the movable conductor 144, and by providing the bellows 148, the gap between the movable conductor 144 and the terminal plate 141 can be sealed. The end of the movable conductor 144 opposite to the side where the movable electrode 146 is supported is connected to a connecting conductor 149 that is grounded, and the connecting conductor 149 is connected to the insulating rod 151 via a metal fitting 150. ing. The insulating rod 151 is connected to the operation mechanism 3 at an upper portion thereof. The parts inside the vacuum valve 102 are joined by high-temperature brazing in a vacuum furnace.

  The other end of the voltage detecting capacitor 152 opposite to the conductor 116 is connected to one end of the voltage detecting coupling capacitor 1001, and the other end of the voltage detecting coupling capacitor 1001 is grounded. A front panel 1002 provided in the housing 2 is a diagnostic means for determining whether the main circuit is charged, and is a plug-in type voltage detection that is an external device in the vacuum switchgear 1. The connection plug 1003 to which the device 2000 is connected is provided. The connection plug 1003 is electrically connected to both ends of the voltage detection coupling capacitor 1001 through the coaxial wiring 1004, and the voltage of the voltage detection coupling capacitor 1001 is connected. Is applied. The voltage detector 2000 includes, for example, LEDs and terminals that can be inserted into the connection plug 1003.

  On the other hand, the terminal 50 for vacuum pressure diagnosis molded integrally with each part of the opening / closing part 100 is located outside the metal container 12 and is disposed facing the metal container 12. This terminal 50 is housed in the housing 2 and connected to a vacuum pressure diagnostic capacitor 1005 whose other end is grounded via a conductor. Further, both ends of the vacuum pressure diagnostic capacitor 1005 are electrically connected to a connection plug 1006 provided on the front panel 1002 of the housing 2 via a coaxial wiring 1007, and the voltage of the vacuum pressure diagnostic capacitor 1005 is Is applied to the connection plug 1006. Here, the connection plug 1006 has the same structure (same structure) as the connection plug 1003 described above, and the voltage detector 2000 is detachably connected thereto.

  Next, the open / close mechanism of the ground open / close vacuum valve 102 installed in the open / close unit 100 will be described. As the insulating rod 151 is driven in the vertical direction by the operating mechanism 3, the movable electrode 146 also moves up and down, and an opening / closing operation with the fixed electrode 145 is performed. One end of the fixed conductor 143 is connected to the conductor 116, and the connecting conductor 149 is grounded. Therefore, the load is grounded by the closing operation of the vacuum valve 102.

  Here, the current flow and the operating mechanism in the opening / closing part 100 will be described. With the configuration described above, the power from the bus 4 is applied to the opening / closing part 100 by the bushing 113 -conductor 112 -fixed conductor 111 -fixed electrode 110 -movable electrode 120 -movable conductor 122 -connecting conductor 124 -movable conductor 123- Electricity is supplied through the path of the movable electrode 121, the fixed electrode 114, the fixed conductor 115, the conductor 116, and the bushing 117, and supplied to the load side via the cable 5. As the insulating rod 127 is driven up and down by the operating mechanism 3, the movable electrodes 120 and 121 are arranged at three positions, that is, an entry position Y0, a cut position Y1, and a disconnect position Y2 formed between the fixed electrodes 110 and 114. The disconnection function is performed by the operation between the entry position Y0 and the disconnection position Y1, and the disconnection function is performed by the operation between the disconnection position Y1 and the disconnection position Y2.

  Hereinafter, a method for determining whether or not the vacuum switching device 1 is energized using the voltage detector 2000 described above and a soundness diagnosis method of the vacuum pressure will be described with reference to FIG.

First, a voltage detector 2000 as an external device for determining whether the main circuit is charged is connected to a connection plug 1003 as a connection means (reference numeral 200). When the conductor 116 is charged, the potential between the voltage detection capacitor 152 and the voltage detection coupling capacitor 1001 is the capacitance C152 of the voltage detection capacitor 152 and the capacitance of the voltage detection coupling capacitor 1001. The divided voltage V1 with respect to the ground voltage V / √3 of the system voltage V determined by C1001
V1 = V / √3 × C152 / (C152 + C1001)
Is equal to Accordingly, since the voltage proportional to the divided voltage V1 is applied to the connection plug 1003 through the coaxial wiring 1004 and the voltage detector 2000 is lit, the main circuit is in an applied state. At the same time, it is diagnosed that the voltage detector 2000 is normal (reference numeral 204). On the other hand, when the voltage detector 2000 is not lit, it is checked whether or not the movable electrodes 120 and 121 are in the closed position. If the voltage detector 2000 is not in the closed position, the operation mechanism 3 is operated to put the movable electrodes 120 and 121 into the closed position. Then, the lighting state of the voltage detector 2000 is observed. When lit, the voltage detector 2000 is diagnosed as normal (reference numeral 204). If it is not lit, or if the movable electrodes 120 and 121 are in the closed position and not lit, the voltage detector 2000 is diagnosed as having failed (reference numeral 203) and either repaired or another voltage detected. The same procedure is performed using the vessel 2000.

  Therefore, it is possible to determine whether the vacuum switchgear 1 is energized and to determine the soundness of the voltage detector 2000 depending on whether the LED of the voltage detector 2000 is turned on (reference numeral 204).

Next, the voltage detector 2000 is connected to a connection plug 1006 which is a connection means (reference numeral 205). The capacitance Cg between the metal container 12 having a floating potential and the grounded conductive coating 21 is sufficiently larger than the capacitance Cm between the main circuit in the vacuum valve 101 and the metal container 12 (Cg >> Cm) Therefore, when the vacuum pressure is healthy, the potential of the metal container 12 becomes substantially equal to the ground potential. On the other hand, when the vacuum pressure deteriorates and a discharge occurs between the main circuit in the vacuum valve 101 and the metal container 12, the potential of the metal container 12 rises to the ground voltage V / √3 of the system voltage V. That is, the potential between the metal container 12, the vacuum pressure diagnostic terminal 50, and the vacuum pressure diagnostic capacitor 1005 is substantially equal to the ground potential when the vacuum pressure is healthy, but the vacuum pressure deteriorates and the main circuit and the metal container 12, when the discharge occurs between the terminal 50 and the metal container 12, the ground voltage V / of the system voltage V determined by the electrostatic capacity C 0 between the terminal 50 and the metal container 12 and the electrostatic capacity C 1005 of the vacuum pressure diagnostic capacitor 1005. Divided voltage V2 for √3
V2 = V / √3 × C0 / (C0 + C1005)
Is equal to

  Therefore, a voltage proportional to the divided voltage V2 is applied to the connection plug 1006 that is electrically connected to the vacuum pressure diagnostic capacitor 1005 through the coaxial wiring 1007. In this case, if the voltage detector 2000 is lit, it is diagnosed that the vacuum pressure is healthy (reference numeral 206), and if it is not lit, it is diagnosed that the vacuum pressure in the vacuum valve 101 is deteriorated (reference numeral 207). . When it is diagnosed that the vacuum pressure is deteriorated, the vacuum valve 101 or the opening / closing part 100 needs to be repaired or replaced.

Here, the relationship required between the electrostatic capacitance C152 of the voltage detection capacitor 152 and the electrostatic capacitance C1001 of the voltage detection coupling capacitor 1001 is as follows. When the operating voltage of the voltage detector 2000 is v, v ≦ V1. At least have to meet,
(C1001 / C152) ≦ {(V / √3) −v} / v
It is.

  Therefore, the ratio of the capacitance C1001 of the voltage detection coupling capacitor 1001 and the capacitance C152 of the voltage detection capacitor 152 is the difference between 1 / √3 of the system voltage V and the operating voltage v of the voltage detector 2000 and the voltage. If it is below the ratio of the operating voltage of the detector 2000, the voltage detector 2000 as a diagnostic means for diagnosing the vacuum pressure can be connected to a connection plug 1006 that is detachably connected, whereby the applied state can be determined. The possibility of deterioration / failure of the alarm lamp can be reduced.

Further, the relationship required for the capacitance C0 between the terminal 50 and the metal container 12 and the capacitance C1005 of the vacuum pressure diagnostic capacitor 1005 must satisfy at least v ≦ V2.
(C1005 / C0) ≦ {(V / √3) −v} / v
It is.

  Accordingly, the ratio of the capacitance C1005 of the vacuum pressure diagnostic capacitor 1005 and the capacitance C0 between the terminal 50 and the metal container 12 is the difference between 1 / √3 of the system voltage V and the operating voltage v of the voltage detector 2000. If the voltage detector 2000 as a diagnostic means for diagnosing the vacuum pressure is connected to a connection plug 1003 that is detachably connected, the soundness of the vacuum pressure is obtained. Can be diagnosed.

  In the present embodiment, the determination of the state of application of the main circuit and the diagnosis of the soundness of the vacuum pressure using the voltage detector 2000 have been described as one procedure, but only the soundness diagnosis of the vacuum pressure by the voltage detector 2000 is performed. This also makes it possible to easily perform soundness diagnosis of vacuum pressure.

  In this embodiment, a terminal 50 disposed opposite to the metal container 12, a vacuum pressure diagnostic capacitor 1005 having one end connected to the terminal 50 through a conductor and the other end grounded, and the vacuum pressure diagnosis A connection plug 1006 that is electrically connected to the capacitor 1005 for power supply through the coaxial wiring 1007 and is removably connected to the voltage detector 2000 as an external device, and is connected to the voltage detector 2000 as an external device at the time of diagnosis. The soundness of vacuum pressure can be diagnosed and can be diagnosed easily. In addition, since the voltage detector 2000 is detachably connected to the connection plug 1006, the voltage detector 2000 is carried after diagnosis, and the same vacuum pressure soundness diagnosis is performed for another vacuum switching device. It can be performed, and a plurality of vacuum switchgears can be diagnosed by one unit, which is convenient and economical.

  In this embodiment, the terminal 50 is disposed outside the metal container 12 so as to face the metal container 12. However, even if a conductive material is used instead of the terminal, a capacitance is generated between the metal container 12 and the terminal. And the soundness diagnosis of said vacuum pressure can be performed.

  According to the present embodiment, the connection plug 1003 and the connection plug 1006 have the same structure. Therefore, before diagnosing the soundness of the vacuum pressure, using the voltage detector 2000, the vacuum switch 1 It can be determined whether or not is charged. In addition, the soundness diagnosis of the voltage detector 2000 can be performed simultaneously by the determination. As a result, a separate circuit for diagnosing the voltage detector 2000 itself and a new inverting circuit need not be provided so that the signal voltage is turned on when healthy and turned off when degraded, and the structure is complicated. In addition, the reliability of the vacuum pressure soundness diagnosis can be improved without increasing the cost.

  In this embodiment, each part of the opening / closing part 100 and the terminal 50 for vacuum pressure diagnosis are integrally molded with an insulator 20 such as epoxy, and the surface is provided with a conductive coating 21 having a ground potential. Even if the insulator 20 is sometimes touched, the safety of the operator can be ensured.

  In the present embodiment, one end of the voltage detection coupling capacitor 1001 and the vacuum pressure diagnosis capacitor 1005 is grounded, but even if not grounded, the potential is lower than the terminal 50 when dielectric breakdown occurs, If the potential is known, the capacitance C0 between the terminal 50 and the metal container 12 and the capacitance C1005 of the vacuum pressure diagnostic capacitor 1005 are set so that the voltage V2 is equal to or higher than the operating voltage of the voltage detector 2000. The voltage detector 2000 can be selected and connected to the connection plug 1006, and the soundness of the vacuum pressure can be diagnosed.

  In this embodiment, the voltage detection capacitor 152, the voltage detection coupling capacitor 1001, and the vacuum pressure diagnosis capacitor 1005 are housed inside the housing. However, even if they are installed outside the housing, for example, This diagnostic technique can be applied.

  In the present embodiment, the connection means are the connection plugs 1003 and 1006. However, if the structure of each connection means is common other than the connection plug, for example, by screwing, the voltage detector 2000 itself is diagnosed. Even if a separate inverting circuit is not provided so that a separate circuit and signal voltage for performing the operation are ON when the sound is healthy and OFF when the signal voltage is deteriorated, it is determined whether the vacuum switching device 1 is energized and the voltage detector 2000 is sound. If the soundness diagnosis of the vacuum pressure is performed after determining the sex, diagnosis based on the fail-safe idea can be performed.

  Therefore, it is possible to improve the reliability of the soundness diagnosis of the vacuum pressure without complicating the structure and increasing the cost. Further, when the voltage detector 2000 has a plurality of terminals that can be inserted into the connection plugs 1003 and 1006, for example, it is determined whether or not the vacuum switching device 1 is energized, and the voltage If the soundness diagnosis of the detector 2000 and the soundness diagnosis of the vacuum pressure are performed at the same time, a diagnosis based on the fail-safe idea can be performed.

  In this embodiment, the connection plugs 1003 and 1006 as connection means to which the voltage detector 2000 as diagnosis means is connected are provided on the front panel 1002 of the case 2 to improve operability and safety. The same effect can be obtained if the diagnostic means such as the voltage detector 2000 is provided not only on the front panel of the body 2 but also by a diagnostician from the outside of the housing 2 at a connectable position.

  In this embodiment, since the connection plug 1003 is connected to the vacuum pressure diagnostic capacitor 1005 and the connection plug 1006 is connected to the voltage detection coupling capacitor 1001 via the coaxial wirings 1007 and 1004, the distance between the wirings can be reduced. As a result, the capacitance generated between the wirings through which the current flows becomes equal at any position on the wirings, so that the vacuum pressure diagnosis capacitor 1005 or the voltage detection coupling capacitor 1001 is equalized. The voltage value applied to the connection plug 1003 and the connection plug 1006 can be adjusted only by the capacitance.

  In the present embodiment, the case where the voltage detector 2000 which is a means for performing the determination of the applied state and the vacuum pressure diagnosis is provided with, for example, an LED, but the connection plugs 1003 and 1006 such as a buzzer other than the LED is used. Of course, what is necessary is just to be able to recognize that the diagnostician is in an abnormal state based on the applied voltage.

It is a sectional side view which shows the vacuum switchgear of Example 1 of this invention. It is sectional drawing of the opening / closing part mounted in the vacuum switching apparatus of Example 1 of this invention. It is a flowchart which shows the vacuum pressure diagnostic method of this invention. It is a characteristic view which shows the relationship between a pressure and a discharge start voltage.

DESCRIPTION OF SYMBOLS 1 Vacuum switchgear 2 Case 3 Operation mechanism 4 Bus 5 Cable 12 Metal container 20 Insulator 21 Conductive coating 50 Terminal 100 Opening and closing part 101, 102 Vacuum valve 110, 114 Fixed electrode 111, 115, 143 Fixed conductor 112, 116 Conductor 117 Bushing 118, 140 Ceramic cylinder 119 Arc shield 120, 121, 146 Movable electrode 122, 123, 144 Movable conductor 124, 149 Connection conductor 125 Ceramic rod 126 Operation rod 127, 151 Insulating rod 130, 148 Bellows 141, 142 Terminal plate 150 Metal fitting 152 Voltage detection capacitor 1001 Voltage detection coupling capacitor 1002 Front panel 1003, 1006 Connection plug 1004, 1007 Coaxial wiring 1005 Vacuum pressure diagnosis capacitor 2000 Voltage detector

Claims (8)

A floating-potential metal container having at least a pair of main circuits composed of a fixed electrode and a movable electrode inside the vacuum, an operating mechanism for opening and closing the fixed electrode of the movable electrode, and the main circuit In a vacuum switchgear comprising a bus for supplying electric power and a cable for supplying electric power from the main circuit to the load side, and housing these in a housing,
A first connecting means for detachably connecting a vacuum pressure diagnostic means for diagnosing the vacuum pressure in the metal container to the casing; and an electric charge diagnosing means for determining whether the main circuit is charged. Comprising a second connecting means detachably connected ;
The structure of the said 1st connection means and the said 2nd connection means is common, The said vacuum pressure diagnostic means and the said electrical charging diagnostic means are the same means, The vacuum switchgear characterized by the above-mentioned . The vacuum switchgear according to claim 1 ,
The second connection means includes a voltage of a voltage detection coupling capacitor connected to the other end of a voltage detection capacitor having one end connected to a load side conductor electrically connected to the main circuit and the cable. Is applied to the vacuum switchgear. The vacuum switchgear according to claim 2 ,
The vacuum switchgear according to claim 1, wherein the voltage of the voltage detecting coupling capacitor is applied to the second connecting means via a coaxial wiring. The vacuum switchgear according to any one of claims 1 to 3 ,
A conductive material facing the metal container outside the metal container and insulated from the metal container; and a vacuum pressure diagnostic capacitor connected to the conductive material,
The vacuum switchgear characterized in that a voltage of the vacuum pressure diagnostic capacitor is applied to the first connecting means. The vacuum switchgear according to claim 4 ,
The vacuum switchgear is characterized in that a voltage of the vacuum pressure diagnostic capacitor is applied to the first connecting means via a coaxial wiring. In the vacuum switchgear according to claim 5 ,
The vacuum switchgear, wherein the conductive material is a conductive terminal. A floating-potential metal container having at least a pair of main circuits composed of a fixed electrode and a movable electrode inside the vacuum, an operating mechanism for opening and closing the fixed electrode of the movable electrode, and the main circuit In a vacuum switchgear comprising a bus for supplying electric power and a cable for supplying electric power from the main circuit to the load side, and housing these in a housing,
A voltage detection coupling capacitor is connected to the other end of the voltage detection capacitor having one end connected to the load-side conductor electrically connected to the main circuit and the cable, and the voltage of the voltage detection coupling capacitor is Is provided through the coaxial wiring, and a connection means to which a diagnosing means for determining whether the main circuit is energized based on the applied voltage is detachably connected is provided in the casing, and the metal A conductive terminal facing the metal container and insulated from the metal container is provided outside the container, the terminal is connected to a vacuum pressure diagnostic capacitor, and the voltage of the vacuum pressure diagnostic capacitor is coaxially wired. A connecting means different from the connecting means to which a diagnostic means for diagnosing the vacuum pressure in the metal container based on the applied voltage is detachably connected. The two connection means are common, and the ratio of the capacitance of the voltage detection coupling capacitor and the capacitance of the voltage detection capacitor is 1 / √3 of the system voltage and the diagnosis the ratio der following operating voltage of the diagnostic means for the difference in operating voltage of the device is,
The vacuum switchgear characterized in that the diagnostic means for determining whether the main circuit is charged and the diagnostic means for diagnosing the vacuum pressure in the metal container are the same means . Each consists of a movable electrode and a fixed electrode, and the periphery of the movable electrode and the fixed electrode is covered with an insulating cylinder, and has a main circuit composed of two pairs of switch units operating at three positions of closed, open and disconnected. The main circuit includes a vacuum switch having an inside disposed in a vacuum metal container;
A vacuum grounding switch comprising a movable electrode and a fixed electrode, and having a switch part in which the periphery of the movable electrode and the fixed electrode is covered with an insulating cylinder, and the switch part is disposed in a vacuum vessel;
An operation mechanism for performing an opening / closing operation with the fixed electrode of the movable electrode in the vacuum switch and the vacuum grounding switch, a bus for supplying power to the main circuit, and a cable for supplying power from the main circuit to a load; The vacuum switch, the vacuum grounding switch, and a housing for storing the operation mechanism therein.
A voltage detection coupling capacitor having one end connected to a ground potential is connected to the other end of the voltage detection capacitor having one end connected to the conductor connecting the main circuit and the cable, and is coaxial with the voltage detection coupling capacitor. A diagnostic means is connected to and connected to the wiring, and a voltage is applied to the voltage detecting coupling capacitor via the coaxial wiring, and a diagnostic means for determining whether the main circuit is charged based on the applied voltage is attached / detached. A first connection plug that can be connected to the casing is provided in the casing, and the conductive container is opposed to the metal container and insulated from the metal container inside the casing and outside the metal container. The terminal is connected to a vacuum pressure diagnostic capacitor having one end at a ground potential, and the vacuum pressure coupling capacitor is connected to the coaxial wiring different from the coaxial wiring. A second connection for detachably connecting a diagnostic means for diagnosing the vacuum pressure in the metal container based on the applied voltage, with the voltage of the vacuum pressure diagnostic capacitor being applied through the wiring. The housing includes a plug, the first and second connection plugs have the same structure, and the vacuum switch, the vacuum ground switch, and the terminal are integrally molded ,
The vacuum switchgear characterized in that the diagnostic means for determining whether the main circuit is charged and the diagnostic means for diagnosing the vacuum pressure in the metal container are the same means .

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