Determination device and determination method

Abstract

A determination device (1) is provided with: an acquisition unit (10) for acquiring the temperature or pressure in a tank (50) of a circuit breaker (5); and a determination unit (20) that determines, on the basis of the temperature or pressure in the tank, the presence or absence of an arc generated by vacuum degradation of a vacuum valve (60) housed in the tank. A determination device (1) is capable of appropriately determining a change in the degree of vacuum of a vacuum container.

Description

Technical Field

[0001] One embodiment of the present invention relates to a determination device for determining vacuum degradation of a vacuum valve. Background Art

[0002] It is known that there is a vacuum valve (vacuum interrupter) provided with a pair of contacts that can contact and separate from each other inside a vacuum container. The vacuum valve is provided in a vacuum circuit breaker provided in a power circuit breaker device, for example, to interrupt the circuit. In such a vacuum valve, if the vacuum degree inside the vacuum container decreases, the insulation performance, that is, the circuit breaking performance, will decrease. Therefore, a technology for determining the decrease in the vacuum degree inside the vacuum container is sought.

[0003] Patent document 1 discloses a vacuum degradation monitoring device, which includes: a pressure measuring container (insulating fixture) having an airtight and sealed structure for accommodating a vacuum valve, and a pressure detection component for detecting a pressure change in the pressure measuring container. Here, when a vacuum leak occurs in the vacuum valve, the insulating gas in the pressure measuring container flows into the vacuum valve, and the pressure in the pressure measuring container decreases. The pressure detection component detects vacuum degradation of the vacuum valve by detecting the pressure decrease in the pressure measuring container.

[0004] In addition, when a vacuum leak occurs in the vacuum valve and gas molecules flow into the vacuum valve, partial discharge occurs in the vacuum valve. A technique for detecting vacuum degradation of a vacuum container by detecting such partial discharge is also known.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent No. 6207805 Summary of the invention

[0008] Problems to be solved by the invention

[0009] In the technology of Patent Document 1, the pressure drop in the pressure measuring container caused by the pressure leakage of the pressure measuring container may be mistakenly judged as the vacuum degradation of the vacuum valve. In addition, when the vacuum of the vacuum valve is degraded due to the impact caused by the arc generated in the normal operation (opening operation) at normal time, the arc will continue in the vacuum valve even after the pair of contacts are cut off. As a result, the gas temperature in the pressure measuring container rises, and the pressure in the pressure measuring container also rises. In this case, there are the following problems: the pressure drop in the pressure measuring container cannot be detected, and the vacuum degradation of the vacuum valve cannot be detected.

[0010] In addition, it is known that if the vacuum leakage of the vacuum valve further progresses and the gas pressure in the vacuum container reaches a predetermined pressure or more, partial discharge will not occur. Therefore, in the technology of detecting vacuum degradation of the vacuum valve by detecting partial discharge, there is a problem that partial discharge cannot be detected if the gas pressure in the vacuum container reaches a predetermined pressure or more.

[0011] An embodiment of the present invention has been made in view of the above-mentioned problem, and an object of the present invention is to appropriately determine vacuum degradation of a vacuum valve.

[0012] Technical means of solving problems

[0013] To solve the above-mentioned problem, a determination device according to one embodiment of the present invention includes: an acquisition unit for acquiring the temperature or pressure inside a first tank of a circuit breaker; and a determination unit for determining, based on the temperature or pressure inside the first tank, whether or not there is an arc generated due to vacuum degradation of a vacuum valve housed in the first tank.

[0014] To solve the above-mentioned problem, a determination method according to one embodiment of the present invention includes: an acquisition step of acquiring the temperature or pressure inside a first tank of a circuit breaker; and a determination step of determining, based on the temperature or pressure inside the first tank, whether there is an arc generated due to vacuum degradation of a vacuum valve housed in the first tank.

[0015] Effects of the Invention

[0016] According to an embodiment of the present invention, a change in the vacuum degree of a vacuum container can be appropriately determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] [ Figure 1 ] is a schematic diagram showing the main part structure of a determination system according to one embodiment of the present invention.

[0018] [ Figure 2 ] is a block diagram showing the structure of the determination device of the determination system.

[0019] [ Figure 3 ] is a graph showing the change in pressure inside the vacuum valve.

[0020] [ Figure 4 ] is a flowchart showing an example of a process in which a determination device determines vacuum degradation of a vacuum valve. DETAILED DESCRIPTION

[0021] [Implementation method 1]

[0022] Figure 1 1 is a schematic diagram showing the main structure of the determination system 1000. Figure 1As shown, the determination system 1000 includes a detection device 100 and a circuit breaker 5. First, before describing the structure of the detection device 100, the structure of the circuit breaker 5 will be described below.

[0023] (Schematic Structure of Circuit Breaker 5)

[0024] The circuit breaker 5 (switch device) includes a tank 50 (first tank), a first circuit 51 , and a second circuit 52 . Figure 1 This is a schematic diagram, and a part of the second circuit 52 is omitted. The circuit breaker 5 is used, for example, to break a circuit in a power circuit breaker device. The circuit breaker 5 is, for example, a vacuum circuit breaker (VCB).

[0025] The tank 50 is a sealed tank that accommodates a vacuum valve 60 described later. The tank 50 is filled with an insulating gas (eg, dry air). The pressure of the insulating gas in the tank 50 is higher than the atmospheric pressure, thereby improving the insulation of the vacuum valve 60.

[0026] The first circuit 51 is one of the power circuit breaker devices ( Figure 1 The second circuit 52 is another ( Figure 1 The first circuit 51 and the second circuit 52 penetrate the tank 50 and are introduced into the tank 50.

[0027] exist Figure 1 In the example shown, a tank 50A (second tank) different from tank 50 is provided on the upper part of tank 50. Tank 50A is also a sealed tank and is filled with a gas at a predetermined pressure. The first circuit 51 penetrates the boundary surface between tank 50 and tank 50A while maintaining the airtightness of tank 50 and tank 50A. That is, tank 50 and tank 50A are connected through the first circuit 51. In addition, Figure 1 In the figure, the first circuit 51 in the tank 50A is omitted. Similarly, a tank 50B (not shown) different from the tank 50 is provided on the side of the tank 50, and the tank 50 and the tank 50B are connected to each other through the second circuit 52.

[0028] The vacuum valve 60 includes a vacuum container 61 and a pair of contacts (not shown). The vacuum container 61 maintains a predetermined vacuum degree and accommodates a pair of contacts connected to the first circuit 51 and the second circuit 52. The pair of contacts is configured to connect / disconnect the contacts (opening and closing operation of the vacuum valve 60) by the operation of an operating unit (not shown).

[0029] Here, as long as the vacuum container 61 maintains a vacuum state, the arc generated between a pair of contacts during the opening action of the vacuum valve 60 will spread and extinguish. That is, the circuit can be disconnected. On the other hand, if the vacuum degree in the vacuum container 61 decreases, the insulation performance, that is, the disconnection performance of the vacuum valve 60 decreases. In order to prevent the disconnection performance of the vacuum valve 60 from decreasing due to the decrease in the vacuum degree in the vacuum container 61, the determination system 1000 of this embodiment is provided with a detection device 100 for determining the decrease (change) in the vacuum degree of the vacuum container 61.

[0030] (Schematic Structure of Detection Device 100)

[0031] The detection device 100 includes a determination device 1, a coaxial cable 2, a partial discharge sensor 4, a temperature sensor 3a, and a pressure sensor 3b. Hereinafter, the partial discharge sensor 4, the temperature sensor 3a, and the pressure sensor 3b are collectively referred to as sensors. The determination device 1 is connected to the sensor via the coaxial cable 2. The sensor ensures insulation from the vacuum valve 60 and is provided inside the tank 50. The determination device 1 determines vacuum degradation of the vacuum valve 60 using physical information detected by the sensor.

[0032] If a vacuum leak occurs in the vacuum container 61, gas molecules will be mixed in from the outside of the vacuum container 61. If the vacuum leak occurs in the closed state of the vacuum valve 60, a partial discharge will be generated inside the vacuum container 61. The partial discharge sensor 4 is a sensor for detecting such a partial discharge. Specifically, the partial discharge sensor 4 is a sensor for detecting a partial discharge signal (such as an electromagnetic wave, a ground line current, or a TEV (Transition Earth Voltage)) accompanying the partial discharge. When the partial discharge sensor 4 detects a partial discharge, the determination device 1 determines that the vacuum degree of the vacuum container 61 is reduced.

[0033] Here, if the vacuum degradation further progresses in the closed state of the vacuum valve 60, the pressure in the vacuum container 61 will soon reach a pressure balance near the original pressure in the tank 50. It can be seen that if the pressure in the vacuum container 61 reaches a predetermined pressure or more, the partial discharge generated before will not occur. Therefore, in the case where the vacuum degradation of the vacuum container 61 rapidly progresses from the normal vacuum state until the pressure is balanced to a state near the original pressure in the tank 50, the partial discharge may not be detected by the partial discharge sensor 4.

[0034] At this time, when a command for a disconnection action is issued in a vacuum-degraded state, the arc continues even after the conductive pair of contacts are cut off (fault current is disconnected or load current is disconnected), and the temperature and pressure of the gas in the vacuum container 61 and the tank 50 increase over time. The temperature sensor 3a and the pressure sensor 3b are sensors for detecting the increase in the temperature and pressure of the gas in the tank 50. When the temperature sensor 3a detects a temperature increase in the gas in the tank 50, the determination device 1 determines that an overheating abnormality has occurred in the tank 50 due to the vacuum-degraded state of the vacuum valve 60 or other factors. Similarly, when the pressure sensor 3b detects a pressure increase in the gas in the tank 50, the determination device 1 determines the vacuum-degraded state of the vacuum valve 60. In addition, Figure 1 , an example in which the temperature sensor 3a is installed in the tank 50 is shown, but the temperature sensor 3a may also be installed on the outer wall of the tank 50.

[0035] In addition, when a pair of contacts of the vacuum valve 60 are disconnected (off static operation state), if a vacuum leak occurs in the vacuum container 61, it will be converted into partial discharge generation and arc generation as the vacuum degradation progresses, so the same abnormality detection operation can be performed.

[0036] (Structure of Determination Device 1)

[0037] Figure 2 is a block diagram showing the structure of the determination device 1. Figure 2 As shown, the determination device 1 includes an acquisition unit 10, a determination unit 20, an alarm unit 30, and a storage unit 40. The determination device 1 determines the vacuum degradation of the vacuum valve 60 in the circuit breaker 5. Hereinafter, the vacuum valve 60 maintaining the vacuum state and the tank 50 accommodating the vacuum valve 60 are respectively referred to as the normal vacuum container 61 and the normal tank 50.

[0038] The acquisition unit 10 includes a partial discharge detection circuit 11, a temperature detection circuit 12a, and a pressure detection circuit 12b. The acquisition unit 10 acquires an output signal output by a sensor. The acquisition unit 10 generates a processed signal after performing a predetermined process on the output signal. The acquisition unit 10 outputs the processed signal to the determination unit 20. In addition, it is sufficient that any one of the temperature sensor 3a and the pressure sensor 3b is provided on the circuit breaker 5. That is, it is sufficient that the acquisition unit 10 includes any one of the temperature detection circuit 12a and the pressure detection circuit 12b in accordance with the sensor provided on the circuit breaker 5.

[0039] The partial discharge detection circuit 11 is a circuit for acquiring a partial discharge signal accompanying a partial discharge generated in the vacuum valve 60. When the partial discharge sensor 4 detects an electromagnetic wave accompanying a partial discharge as a partial discharge signal, the partial discharge detection circuit 11 acquires a high-frequency signal received by the partial discharge sensor 4. The partial discharge detection circuit 11 uses a known filter on the high-frequency signal to pass a signal component of a predetermined frequency band (for example, a frequency band from a high frequency (HF) band to a very high frequency (VHF) band). Thus, the partial discharge detection circuit 11 can extract waveform data of the electromagnetic wave accompanying the partial discharge. The partial discharge detection circuit 11 outputs the high-frequency signal of the predetermined frequency band to the determination unit 20 as a processed signal. In addition, the partial discharge detection circuit 11 can also monitor the presence or absence of a partial discharge signal at all times and store the high-frequency signal of the predetermined frequency band in the storage unit 40.

[0040] The temperature detection circuit 12a is a circuit for acquiring the temperature T in the tank 50 of the circuit breaker 5. The temperature detection circuit 12a acquires the output signal output by the temperature sensor 3a (for example, when the temperature sensor 3a is a temperature measuring resistor, the voltage across the temperature measuring resistor). The temperature detection circuit 12a determines the temperature T in the tank 50 sensed by the temperature measuring sensor 3a based on the output signal. The temperature detection circuit 12a outputs the determined temperature T in the tank 50 as a processing signal to the determination unit 20. In addition, the temperature detection circuit 12a may always acquire the temperature T in the tank 50 and store it in the storage unit 40. Furthermore, the temperature detection circuit 12a may acquire the output signal output by a temperature sensor (not shown) provided in a tank 50A different from the tank 50. The temperature detection circuit 12a also determines the temperature TA in the tank 50A and outputs it to the determination unit 20.

[0041] The pressure detection circuit 12b is a circuit for acquiring the pressure in the tank 50 of the circuit breaker 5. Similar to the case where the temperature detection circuit 12a determines the temperature T in the tank 50 of the circuit breaker 5 and outputs it to the determination unit 20, the pressure detection circuit 12b determines the pressure in the tank 50 of the circuit breaker 5 and outputs it to the determination unit 20.

[0042] The determination unit 20 determines whether the partial discharge sensor 4 has detected a partial discharge. For example, the determination unit 20 determines whether the intensity I of the high-frequency signal in a predetermined frequency band is greater than or equal to a threshold value Th0 based on the waveform data output by the partial discharge detection circuit 11. When the intensity I is greater than or equal to the threshold value Th0, it is determined that the partial discharge sensor 4 has detected a partial discharge (that is, the vacuum degree of the vacuum valve 60 has decreased). In addition, commercial synchronization is also added to the determination conditions, and the detection accuracy can be further improved.

[0043] In addition, the determination unit 20 determines whether the vacuum of the vacuum valve 60 is deteriorated based on the temperature T in the tank 50. For example, the determination unit 20 determines whether the temperature T in the tank 50 output by the temperature detection circuit 12a is equal to or greater than the threshold value Th1. When the temperature T is equal to or greater than the threshold value Th1, it is determined that an arc has occurred in the vacuum valve 60 (that is, the vacuum degree of the vacuum valve 60 has decreased). In addition, the determination unit 20 may determine the threshold value Th1 according to the surrounding environment (for example, the temperature of the outside air). In addition, the determination unit 20 may determine whether an arc has occurred in the vacuum valve 60 by comparing the temperature T in the tank 50 with the temperature TA in the tank 50A in the same environment as the tank 50. For example, when T-TA is equal to or greater than a predetermined threshold value or when T / TA is equal to or greater than a predetermined threshold value, the determination unit 20 determines that an arc has occurred in the vacuum valve 60. Thus, even when the temperature T of the tank 50 in normal state changes according to the surrounding environment of the circuit breaker 5, it is possible to appropriately determine the increase in the temperature T in the vacuum valve 60 caused by the arc.

[0044] Similarly, the determination unit 20 determines the vacuum degradation of the vacuum valve 60 based on the pressure in the tank 50. For example, the determination unit 20 determines whether the pressure P in the tank 50 output by the pressure detection circuit 12b is greater than or equal to the threshold value Th2. When the pressure P is greater than or equal to the threshold value Th2, it is determined that an arc has occurred in the vacuum valve 60 (that is, the vacuum degree of the vacuum valve 60 has decreased).

[0045] The alarm unit 30 notifies the outside that the vacuum degree of the vacuum valve 60 has decreased based on the determination result of the determination unit 20. In addition, the alarm unit 30 outputs an interlock indicating that the vacuum degree of the vacuum valve 60 has decreased.

[0046] The storage unit 40 stores various data used in the determination device 1. The storage unit 40 stores in advance, for example, threshold values ​​used for determination by the determination unit 20. The storage unit 40 also stores the temperature T and pressure P in the tank 50 output by the temperature detection circuit 12a and the pressure detection circuit 12b.

[0047] Figure 3 : is a diagram showing the pressure change in the vacuum valve 60 when the vacuum of the vacuum valve 60 deteriorates. Figure 3 As shown, the pressure in the vacuum valve 60 increases over time as the insulating gas in the tank 50 flows into the vacuum valve 60. The pressure in the vacuum valve 60 reaches a predetermined first pressure P1 at time t1, reaches a predetermined second pressure P2 (pressure around atmospheric pressure) at time t2, and finally becomes equal to the pressure P3 in the tank 50.

[0048] When the pressure in the vacuum valve 60 is below the predetermined first pressure P1, even if the commercial voltage is applied to the pair of contacts, no partial discharge occurs in the vacuum valve 60. Therefore, the determination device 1 does not detect a partial discharge signal accompanying partial discharge before time t1, and determines that the vacuum container 61 maintains a vacuum state.

[0049] On the other hand, when the pressure in the vacuum valve 60 is between the predetermined first pressure P1 and the predetermined second pressure P2, application of the commercial voltage causes partial discharge in the vacuum valve 60. Therefore, the determination device 1 can detect a partial discharge signal accompanying the partial discharge between time t1 and time t2.

[0050] However, if the pressure in the vacuum valve 60 reaches or exceeds the predetermined second pressure P2, the partial discharge may disappear. Therefore, in the case where the pressure in the vacuum valve rises suddenly, for example, the time during which the determination device 1 can detect the partial discharge signal is short, and therefore the partial discharge detection circuit 11 may miss the detection of the partial discharge signal.

[0051] Therefore, even when the partial discharge detection circuit 11 does not obtain a partial discharge signal, the determination unit 20 determines whether an arc has occurred in the vacuum valve 60 based on the temperature and pressure in the tank 50. That is, the determination device 1 determines the vacuum degradation of the vacuum valve 60 based not only on the partial discharge detected by the partial discharge sensor 4 but also on the temperature T and pressure P of the gas in the tank 50 detected by the temperature sensor 3a and the pressure sensor 3b, respectively. This may serve as a backup in the case where the partial discharge sensor 4 cannot detect a partial discharge before the pressure of the gas in the vacuum container 61 reaches the predetermined second pressure P2.

[0052] (Operation Example of Determination Device 1)

[0053] Figure 4 2 is a flowchart showing an example of a process of determining whether the vacuum valve 60 is deteriorated by the determination device 1. Figure 4 Hereinafter, an operation example of the determination device 1 determining the vacuum degradation of the vacuum valve 60 based on the temperature T in the tank 50 , the pressure P in the tank 50 , and the partial discharge signal will be described.

[0054] like Figure 4As shown, first, the partial discharge detection circuit 11 acquires the partial discharge signal received by the partial discharge sensor 4 (S1). The partial discharge detection circuit 11 performs a predetermined process on the partial discharge signal and outputs it to the determination unit 20. Next, the temperature detection circuit 12a and the pressure detection circuit 12b acquire the output signals output by the temperature sensor 3a and the pressure sensor 3b, respectively (acquisition step S2). The temperature detection circuit 12a and the pressure detection circuit 12b determine the temperature T and the pressure P in the tank 50, respectively, and output them to the determination unit 20.

[0055] Next, the determination unit 20 determines whether the partial discharge sensor 4 detects partial discharge (S3). When it is determined that the partial discharge sensor 4 detects partial discharge (YES in S3), the determination unit 20 determines that the vacuum degree of the vacuum valve 60 is reduced. Thereafter, the alarm unit 30 outputs an interlock indicating that the vacuum degree of the vacuum valve 60 is reduced (S5).

[0056] When it is determined that the partial discharge sensor 4 has not detected partial discharge (NO in S3), the determination unit 20 determines whether the arc continues based on the temperature T and pressure P in the tank 50. That is, the determination unit 20 determines whether the temperature T in the tank 50 is greater than or equal to the threshold value Th1 and the pressure in the tank 50 is greater than or equal to the threshold value Th2 (determination step S4). When the temperature T in the tank 50 is greater than or equal to the threshold value Th1 or the pressure P in the tank 50 is greater than or equal to the threshold value Th2 (YES in S4), the determination unit 20 determines that the arc continues. Thereafter, the alarm unit 30 outputs an interlock indicating that the arc continues (S5). When the temperature T in the tank 50 is not greater than or equal to the threshold value Th1 and the pressure P in the tank 50 is not greater than or equal to the threshold value Th2 (YES in S4), the determination unit 20 determines that the vacuum state of the vacuum valve 60 is maintained. Thereafter, the process returns to S1. That is, the determination device 1 always monitors the presence or absence of the partial discharge signal and the temperature T and pressure P in the tank 50 during the monitoring period.

[0057] As described above, the determination device 1 can detect the occurrence of arcs in the vacuum valve 60 by monitoring the temperature T and pressure P in the tank 50. Thus, the presence or absence of arcs caused by vacuum deterioration in the vacuum valve 60 can be appropriately determined.

[0058] In addition, the detection of the occurrence of the arc as described above is performed together with the detection of the partial discharge signal. Therefore, even if the partial discharge detection circuit 11 misses the detection of the partial discharge signal, by monitoring the temperature T and pressure P in the tank 50, it is possible to appropriately determine whether or not there is an arc caused by the vacuum degradation of the vacuum valve. In addition, the partial discharge signal can be detected shortly after the vacuum valve is degraded ( Figure 3Therefore, by also detecting the partial discharge signal, it is possible to perform high-speed diagnosis of vacuum degradation of the vacuum valve.

[0059] 〔Software-based implementation example〕

[0060] The function of the determination device 1 (hereinafter referred to as “device”) can be realized by a program for causing a computer to function as the device and for causing the computer to function as each control block of the device (particularly the acquisition unit 10 and the determination unit 20 ).

[0061] In this case, the device includes a computer having at least one control device (e.g., a processor) and at least one storage device (e.g., a memory) as hardware for executing the program. By executing the program using the control device and the storage device, the functions described in the embodiments can be realized.

[0062] The program may not be temporary, but may be recorded in one or more recording media that can be read by a computer. The device may include the recording medium or may not include the recording medium. In the latter case, the program may be supplied to the device via any transmission medium, whether wired or wireless.

[0063] In addition, part or all of the functions of each control block can also be realized by a logic circuit. For example, an integrated circuit having a logic circuit that functions as each control block is also included in the scope of the present invention. In addition, for example, the functions of each control block can also be realized by a quantum computer.

[0064] In addition, each process described in each embodiment may be executed by AI (Artificial Intelligence). In this case, AI may be executed by the control device or by another device (for example, an edge computer or a cloud server).

[0065] (Summarize)

[0066] A determination device according to one embodiment of the present invention includes: an acquisition unit that acquires the temperature or pressure in a first tank of a circuit breaker; and a determination unit that determines whether an arc is generated due to vacuum degradation of a vacuum valve housed in the first tank based on the temperature or pressure in the first tank.

[0067] In addition, the acquisition unit may acquire a local discharge signal accompanying local discharge generated in the vacuum valve, and the determination unit may determine the vacuum degradation of the vacuum valve based on the local discharge signal. When the acquisition unit does not acquire the local discharge signal, the determination unit may determine the presence or absence of an arc generated accompanying the vacuum degradation of the vacuum valve based on the temperature or pressure in the first tank.

[0068] Furthermore, the determination unit may determine the presence or absence of arcing caused by vacuum degradation of the vacuum valve when the temperature or pressure in the first tank is equal to or higher than a threshold value.

[0069] In addition, the acquisition unit may acquire the temperature or pressure in a second tank different from the first tank, and the determination unit may determine whether there is an arc caused by vacuum degradation of the vacuum valve by comparing the temperature or pressure in the first tank with the temperature or pressure in the second tank.

[0070] A determination method according to one embodiment of the present invention comprises: an acquisition step of acquiring the temperature or pressure in a first tank of a circuit breaker; and a determination step of determining whether an arc is generated due to vacuum degradation of a vacuum valve housed in the first tank based on the temperature or pressure in the first tank.

[0071] The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. Embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention.

[0072] Description of Figure Numbers

[0073] 1: Determination device

[0074] 5: Circuit Breaker

[0075] 10: Get Department

[0076] 20: Judgment Department

[0077] 50: Can (First Can)

[0078] 50A: Tank (Second Tank)

[0079] 60: Vacuum valve

Claims

1. A determination device, comprising: an acquisition unit, which acquires the temperature or pressure in the first tank of the circuit breaker; as well as The determination unit determines the presence or absence of arcing caused by vacuum degradation of the vacuum valve accommodated in the first tank based on the temperature or pressure in the first tank.

2. The determination device according to claim 1, wherein: The acquisition unit acquires a partial discharge signal associated with a partial discharge generated in the vacuum valve. The determination unit determines vacuum degradation of the vacuum valve based on the partial discharge signal. When the acquisition unit does not acquire the partial discharge signal, the determination unit determines the presence or absence of an arc generated due to vacuum degradation of the vacuum valve based on the temperature or pressure in the first tank.

3. The determination device according to claim 1 or 2, wherein: The determination unit determines whether or not an arc is generated due to vacuum degradation of the vacuum valve when the temperature or pressure in the first tank is equal to or higher than a threshold value.

4. The determination device according to claim 1 or 2, wherein: The acquiring unit acquires the temperature or pressure in a second tank different from the first tank, The determination unit determines whether or not an arc is generated due to vacuum degradation of the vacuum valve by comparing the temperature or pressure in the first tank with the temperature or pressure in the second tank.

5. A determination method, comprising: An acquiring step of acquiring the temperature or pressure in the first tank of the circuit breaker; as well as The determination step determines whether or not an arc is generated due to vacuum degradation of a vacuum valve housed in the first tank, based on the temperature or pressure in the first tank.

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