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JP-7856247-B2 - Determination device and determination method

JP7856247B2JP 7856247 B2JP7856247 B2JP 7856247B2JP-7856247-B2

Inventors

  • 山里 将史
  • 堀越 和彦
  • 増田 新

Assignees

  • 日新電機株式会社
  • 国立大学法人京都工芸繊維大学

Dates

Publication Date
20260511
Application Date
20220404

Claims (10)

  1. A vibration unit that applies vibration to the vacuum container, A detection unit for detecting vibrations transmitted from the vacuum vessel when the vibration excitation unit applies vibration to the vacuum vessel, The system includes a determination unit that determines a change in the vacuum level of the vacuum vessel based on a change in the natural frequency of the vacuum vessel, The vibration unit and the detection unit are separate piezoelectric elements, and the separate piezoelectric elements are provided at positions that sandwich the vacuum container, The separate piezoelectric elements mentioned above function as both the excitation unit and the detection unit. The determination unit is a determination device that determines a change in the natural frequency of the vacuum vessel based on the vibration detected by each of the separate piezoelectric elements.
  2. A vibration unit that applies vibration to the vacuum container, A detection unit for detecting vibrations transmitted from the vacuum vessel when the vibration excitation unit applies vibration to the vacuum vessel, The system includes a determination unit that determines a change in the vacuum level of the vacuum vessel based on a change in the natural frequency of the vacuum vessel, The vacuum container, together with a pair of contacts in the circuit breaker, constitutes a vacuum valve. A determination device in which the vibration unit and the detection unit are provided on the outer surface of a tank housing the vacuum valve.
  3. A vibration unit that applies vibration to the vacuum container, A detection unit for detecting vibrations transmitted from the vacuum vessel when the vibration excitation unit applies vibration to the vacuum vessel, The system includes a determination unit that determines a change in the vacuum level of the vacuum vessel based on a change in the natural frequency of the vacuum vessel, The vacuum container, together with a pair of contacts in the circuit breaker, constitutes a vacuum valve. A determination device in which the vibration unit and the detection unit are provided inside a tank that houses the vacuum valve.
  4. The determination device according to claim 2 or 3 , wherein the excitation unit and the detection unit are the same piezoelectric element.
  5. The determination device according to claim 2 or 3 , wherein the vibration unit and the detection unit are separate piezoelectric elements, and the separate piezoelectric elements are provided at positions that sandwich the vacuum container.
  6. The determination device according to claim 1 , wherein the vacuum container, together with a pair of contacts in the circuit breaker, constitutes a vacuum valve.
  7. The determination device according to claim 6 , wherein the vibration unit and the detection unit are provided on the outer surface of the vacuum valve.
  8. An excitation step in which vibration is applied to the vacuum vessel by the vibration unit , A detection step in which a detection unit detects vibrations transmitted from the vacuum vessel when vibrations are applied to the vacuum vessel by the excitation step, The process includes a determination step of determining a change in the vacuum level of the vacuum vessel based on a change in the natural frequency of the vacuum vessel, The vibration unit and the detection unit are separate piezoelectric elements, and the separate piezoelectric elements are provided at positions that sandwich the vacuum container, The separate piezoelectric elements mentioned above function as both the excitation unit and the detection unit. The determination step involves determining a change in the natural frequency of the vacuum vessel based on the vibration detected by each of the separate piezoelectric elements .
  9. An excitation step in which vibration is applied to the vacuum vessel by the vibration unit , A detection step in which a detection unit detects vibrations transmitted from the vacuum vessel when vibrations are applied to the vacuum vessel by the excitation step, The process includes a determination step of determining a change in the vacuum level of the vacuum vessel based on a change in the natural frequency of the vacuum vessel, The vacuum container, together with a pair of contacts in the circuit breaker, constitutes a vacuum valve. A determination method wherein the vibration unit and the detection unit are provided on the outer surface of a tank housing the vacuum valve .
  10. An excitation step in which vibration is applied to the vacuum vessel by the vibration unit , A detection step in which a detection unit detects vibrations transmitted from the vacuum vessel when vibrations are applied to the vacuum vessel by the excitation step, The process includes a determination step of determining a change in the vacuum level of the vacuum vessel based on a change in the natural frequency of the vacuum vessel, The vacuum container, together with a pair of contacts in the circuit breaker, constitutes a vacuum valve. A determination method wherein the vibration unit and the detection unit are provided inside a tank that houses the vacuum valve .

Description

One aspect of the present invention relates to a determination device for determining changes in the vacuum level in a vacuum vessel. Vacuum valves (vacuum interrupters) are known in which a pair of contacts capable of contacting and separating from each other are provided inside a vacuum container. Vacuum valves are installed, for example, in vacuum circuit breakers in power interruption equipment to interrupt the electrical circuit. In such vacuum valves, a decrease in the vacuum level inside the vacuum container leads to a decrease in insulation performance, i.e., interruption performance. Therefore, there is a need for technology to determine the decrease in the vacuum level inside the vacuum container. Patent Document 1 discloses a technique for detecting electromagnetic waves generated by internal discharge in a vacuum valve to identify the discharge initiation voltage, and for estimating the vacuum level of the vacuum valve based on a Paschen curve showing the correlation between the discharge initiation voltage and the vacuum level. Patent Document 2 discloses a technique for determining whether a signal detected by an antenna during discharge in a vacuum valve is due to discharge caused by vacuum level degradation within the vacuum valve. Japanese Patent Publication No. 2015-15172Japanese Patent Publication No. 2005-302331 This is a block diagram showing an example of the main components of a determination system according to one embodiment of the present invention.This figure shows an example of a measurement circuit in a judgment system.This flowchart shows an example of a judgment process in which a judgment system determines a decrease in the vacuum level of a vacuum container.This block diagram shows another example of the main components of a judgment system.This block diagram shows yet another example of the main components of a judgment system.This figure shows another example of a measurement circuit in a judgment system. [Embodiment 1] Hereinafter, Embodiment 1 of the present disclosure will be described in detail with reference to Figures 1 to 4. Figure 1 is a block diagram showing the configuration of the main part of the determination system 100. Figure 2 is a diagram showing an example of a measurement circuit in the determination system 100. In the following description, a determination device for determining a decrease in the vacuum level of a vacuum vessel in a circuit breaker will be used as an example. However, the determination device according to this embodiment is not limited to a vacuum vessel in a circuit breaker, but can be applied to vacuum vessels in various situations. Figure 1 is a block diagram showing an example of the main components of the determination system 100. As shown in Figure 1, the determination system 100 comprises a determination device 1 and a circuit breaker 2. First, before describing the configuration of the determination device 1, the configuration of the circuit breaker 2 will be explained below. (Outline configuration of circuit breaker 2) The circuit breaker 2 (switching device) comprises a tank 50, a vacuum valve 60, and an actuator 70. The circuit breaker 2 is used, for example, to interrupt an electrical circuit in a power interruption system. Examples of circuit breakers 2 include vacuum circuit breakers and gas circuit breakers. Tank 50 is a sealed tank housing the vacuum valve 60, which will be described later. If the circuit breaker 2 is a gas-insulated switchgear, tank 50 is filled with an insulating gas (e.g., dry air). If the circuit breaker 2 is a vacuum circuit breaker, the inside of tank 50 is maintained at a predetermined vacuum level (vacuum state). Furthermore, the first circuit 51, which is one of the circuits in the power interruption equipment (the upper side in Figure 1), and the second circuit 52, which is the other circuit in the power interruption equipment (the lower side in Figure 1), penetrate the tank 50 and are introduced into the interior of the tank 50. Inside the tank 50, insulating members are provided between the circuits in the power interruption equipment and the tank 50 to support the vacuum valve 60 while maintaining insulation between the circuits and the tank 50. Specifically, inside the tank 50, a first insulating member 53 is provided between the first circuit 51 and the upper part of the tank 50. Also, inside the tank 50, a second insulating member 54 is provided between the second circuit 52 and the lower part of the tank 50. The vacuum valve 60 comprises a vacuum chamber 61, a fixed contact 62, and a movable contact 63. The vacuum chamber 61 is maintained at a predetermined vacuum level and houses the fixed contact 62 and the movable contact 63. The fixed contact 62 is connected to the first circuit 51 and has a contact point with the movable contact 63 at its end on the vacuum chamber 61 side. The fixed contact 62 is fixed to the vacuum chamber 61. The movable contact 63 is connected to the second circu