switch

Abstract

To provide a technique which suppresses the malfunction of a switch.SOLUTION: A switch includes: overcurrent detection means which detects an overcurrent accident at an electric path; power failure detection means which detects a power failure at the electric path; vibration sensing means which detects vibration; and a control device which internally has the vibration sensing means. The control device controls to perform a trip operation of a switch body when the power failure of the electric path is detected by the power failure detection means in addition to the detection of the overcurrent accident of the electric path by the overcurrent detection means, or when vibration is detected by the vibration sensing means and the power failure of the electric path is detected continuously for a predetermined time by the power failure detection means.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This specification discloses a technique related to a switch that opens and closes an electric circuit. [Background technology]

[0002] Patent Document 1 discloses a switch that can prevent secondary disasters, such as fires, caused by energization of electrical equipment of an electric power consumer after the power supply is resumed when a power outage occurs due to a disaster such as an earthquake. The switch of Patent Document 1 does not trip (does not open) the switch when an overcurrent accident occurs in an electric circuit, but keeps the tripped state in a standby state. The switch then trips (opens) the switch when a power outage is detected by a power outage detection means, or when vibration is detected by a vibration detection means and a power outage is detected by the power outage detection means. In other words, the switch of Patent Document 1 does not trip when vibration is detected by the vibration detection means alone, but trips when a power outage is detected together with vibration. This prevents the switch from tripping (misoperating) when vibrations that are not caused by a disaster such as an earthquake are detected, such as when a large vehicle passes around the switch and causes vibrations. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-273389 Summary of the Invention [Problem to be solved by the invention]

[0004] The switch disclosed in Patent Document 1 trips when both a power outage and vibration are detected. This prevents the switch from malfunctioning (false opening). However, if the voltage of the electrical circuit temporarily drops coincidentally with the detection of vibration, the switch may determine that a power outage has been detected along with the vibration and trip. A temporary voltage drop in an electrical circuit refers to a voltage drop of approximately 90% or less of the normal voltage for approximately two seconds or less, and is sometimes referred to as a "voltage drop." In other words, the switch disclosed in Patent Document 1 may malfunction by tripping even when a tripping operation is unnecessary if a special condition occurs, such as the coincidence of an extremely short power outage (voltage drop) that is not generally considered a power outage and the detection of vibration that is not caused by a disaster such as an earthquake. This specification aims to provide a technology for preventing switch malfunctions. [Means for solving the problem]

[0005] One embodiment of a switch disclosed in this specification includes an overcurrent detection means for detecting an overcurrent fault in an electric circuit, a power outage detection means for detecting a power outage in the electric circuit, a vibration sensing means for detecting vibrations, and a control device having the vibration sensing means installed therein. The control device may trip the switch body when the overcurrent detection means detects an overcurrent fault in the electric circuit and the power outage detection means detects a power outage in the electric circuit, or when the vibration sensing means detects vibrations and the power outage detection means detects a power outage in the electric circuit that continues for a predetermined time.

[0006] Another embodiment of the switch disclosed in this specification includes overcurrent detection means for detecting an overcurrent fault in an electric circuit, ground fault detection means for detecting a ground fault in the electric circuit, power outage detection means for detecting a power outage in the electric circuit, vibration sensing means for detecting vibrations, and a control device having the vibration sensing means installed therein. The control device prepares the tripping operation of the switch main body when the overcurrent detection means detects an overcurrent fault in the electric circuit, and can trip the switch main body in any of the following cases (1) to (3): (1) When the overcurrent detection means detects an overcurrent fault and the power outage detection means detects a power outage in the electric circuit; (2) When the ground fault detection means detects a ground fault and the overcurrent detection means does not detect an overcurrent fault; or (3) When vibration is detected by the vibration sensing means and the power outage detection means detects a power outage in the electric circuit that continues for a predetermined period of time.

[0007] Yet another embodiment of the switch disclosed in this specification includes a ground fault detection means for detecting a ground fault in an electric circuit, a power failure detection means for detecting a power failure in the electric circuit, a vibration sensing means for detecting vibrations, and a control device having the vibration sensing means provided therein. The control device may trip the switch body when the ground fault detection means detects a ground fault, or when the vibration sensing means detects vibrations and the power failure detection means detects a power failure in the electric circuit that continues for a predetermined period of time. [Brief explanation of the drawings]

[0008] [Figure 1] A schematic diagram of a switch is shown. [Figure 2] 1 shows a block diagram of a switch according to a first embodiment. [Figure 3] FIG. 10 shows a block diagram of a switch according to a second embodiment. [Figure 4] FIG. 10 shows a block diagram of a switch according to a third embodiment. [Figure 5] FIG. 10 shows a block diagram of a switch according to a fourth embodiment. [Figure 6] FIG. 10 shows a block diagram of a switch according to a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] The switch disclosed in this specification may include an overcurrent detection means for detecting an overcurrent fault in an electric circuit, a power outage detection means for detecting a power outage in the electric circuit, a vibration sensing means for detecting vibrations, and a control device. The overcurrent detection means, the power outage detection means, the vibration sensing means, and the control device may all be packaged together. Alternatively, some of the overcurrent detection means, the power outage detection means, and the vibration sensing means may be located in a switch body separate from the control device. In this case, the control device and the switch body can be installed in different locations by connecting them with a cable. For example, the control device can be installed at the bottom of the utility pole and the switch body can be installed at the top of the utility pole.

[0010] The switch may prepare for tripping of the switch body and close the electric circuit when the overcurrent detection means detects an overcurrent fault in the electric circuit. The switch body may then be tripped when both the overcurrent fault and the electric circuit power outage are detected by the power outage detection means. The switch body may also be tripped when vibration is detected by the vibration detection means and a power outage in the electric circuit continues for a predetermined period of time by the power outage detection means. That is, even if vibration is detected by the vibration detection means, the switch does not trip if the power outage detection means does not detect a power outage in the electric circuit for a predetermined period of time. This prevents tripping when the voltage in the electric circuit temporarily drops (in the case of a voltage sag). The switch disclosed in this specification can suppress erroneous tripping when a voltage sag in the electric circuit occurs (when no tripping is required).

[0011] In addition to the above configuration, the switch disclosed in this specification may also include a ground fault detection means for detecting a ground fault in the electric circuit. In this case, the switch can perform a tripping operation even when the ground fault detection means detects a ground fault but the overcurrent detection means does not detect an overcurrent fault.

[0012] Furthermore, the circuit breaker disclosed in this specification may be provided with an AND circuit to which the output signal of the overcurrent detection means and the output signal of the vibration sensing means are input in addition to the ground fault detection means. Even in this configuration, a tripping operation can be performed when a ground fault is detected by the ground fault detection means but an overcurrent fault is not detected by the overcurrent detection means. [Example]

[0013] With reference to Figure 1, an overview of a high-voltage air switch 100 will be described. The high-voltage air switch 100 is an example of a switch, and is an overcurrent lock type (SOG type) high-voltage air switch. The high-voltage air switch 100 comprises a switch body 50 and a control device 30 that controls the operation of the switch body 50. The switch body 50 and the control device 30 are connected by a cable. The switch body 50 is installed at the top of a utility pole (not shown), and the control device 30 is installed at the bottom of the utility pole. First, the internal configuration of the switch body 50 will be described.

[0014] (Structure of the switch body) The switch body 50 is provided on an electric circuit 52. More specifically, the switch body 50 is connected to an electric power supply side (power supply side) electric circuit 52a and a consumer side (load side) electric circuit 52b, electrically connecting the two (closing the electric circuit 52). The electric circuit 52 has an R phase, an S phase, and a T phase. On the electric circuit 52, a zero-phase current transformer 58, a switching unit 54, a control power supply transformer 80, and a current detection unit 60 are arranged in this order from the power supply side to the load side.

[0015] The zero-phase-sequence current transformer 58 detects a zero-phase-sequence current (ground fault current) occurring in the electric circuit 52. Both ends of the zero-phase-sequence current transformer 58 are connected to the control device 30. As will be described in detail later, both ends of the zero-phase-sequence current transformer 58 are connected to a circuit (ground fault detection circuit 31: see FIG. 2) within the control device 30. When the zero-phase-sequence current transformer 58 detects a zero-phase-sequence current, it outputs a detection signal to the control device 30 (ground fault detection circuit 31).

[0016] The switching unit 54 includes switches 54r, 54s, and 54t. The switches 54r, 54s, and 54t are respectively provided on the R phase, S phase, and T phase of the electric circuit 52. When the switching unit 54 is opened, the electric circuit 52 is opened, and when the switching unit 54 is closed, the electric circuit 52 is closed.

[0017] The control power supply transformer 80 has two coils with different numbers of turns, the primary coil being connected to two phases (S-phase and T-phase) of the electric circuit 52, and the secondary coil being connected to the circuits within the control device 30 (power supply circuit 33, energy storage circuit 35: see FIG. 2). The control power supply transformer 80 can generate power to drive the circuits within the control device 30. The high-voltage air contactor 100 can secure power to drive the circuits within the control device 30 by utilizing the voltage of the electric circuit 52, so it is possible to omit providing a separate power supply just for driving the circuits within the control device 30.

[0018] The current detection unit 60 includes current transformers 60r and 60t. As described above, the current detection unit 60 is located downstream of the switching unit 54 (on the consumer-side electrical circuit 52b side). Therefore, the current transformers 60r and 60t can detect the load currents flowing through the R and T phases of the electrical circuit 52, respectively. The current detection unit 60 is connected to a microswitch 70. The microswitch 70 is a double-throw type and includes a normally closed contact 72, a normally open contact 74, and a common contact 76. The normally closed contact 72 and the common contact 76 are connected to a circuit (overcurrent detection circuit 36; see FIG. 2 ) within the control device 30. When the current detection unit 60 (current transformers 60r and 60t) detects a current equal to or greater than the overcurrent detection threshold, the normally open contact 74 of the microswitch 70 connects to the common contact 76 (the normally closed contact 72 opens). When the normally open contact 74 connects to the common contact 76, a detection signal is output to the control device 30. Furthermore, the normally closed contact 72 is connected to the trip coil 56. The trip coil 56 is connected to a component (normally open contact 41: see FIG. 2) within the control device 30. The trip coil 56 trips (opens) the switches 54r, 54s, and 54t of the opening / closing unit 54.

[0019] (Controller structure: first embodiment) The control device 30 will be described with reference to Fig. 2. The control device 30 includes a plurality of circuits, normally open contacts 41, and a vibration sensor 10. The ground fault detection circuit 31 is connected to the zero-phase-sequence current transformer 58 (see also Fig. 1), and outputs a ground fault detection signal to the operation determination circuit 32 when it detects an output signal from the zero-phase-sequence current transformer 58.

[0020] The power supply circuit 33 is connected to the control power supply transformer 80 (see also FIG. 1), and smooths the line voltage of the S phase and T phase of the electric circuit 52 and converts it into a DC voltage. The power supply circuit 33 is also connected to the power failure detection circuit 34. Therefore, when the electric circuit 52 experiences a power failure, the power supply from the power supply circuit 33 stops, and the power failure detection circuit 34 can determine that the electric circuit 52 has experienced a power failure. When the power failure detection circuit 34 determines that the electric circuit 52 has experienced a power failure, it outputs a power failure detection signal to the AND circuit 37 and the vibration sensor 10 (operation delay timer circuit 4). Although not shown in the figure, the DC voltage converted by the power supply circuit 33 is In the control device 30 The signal is also supplied to circuits other than the power failure detection circuit 34.

[0021] The energy storage circuit 35 is connected to the control power supply transformer 80, and stores the line voltage between the S phase and the T phase of the electric circuit 52 as a power source for exciting the trip coil 56 (see also FIG. 1). A normally open contact 41 is provided between the energy storage circuit 35 and the trip coil 56. When the normally open contact 41 closes, the power stored in the energy storage circuit 35 is supplied to the trip coil 56, which is excited and causes the switching unit 54 to trip.

[0022] The overcurrent detection circuit 36 ​​is connected to the current detection unit 60 (see also FIG. 1 ), and when an overcurrent detection signal is input from the current detection unit 60, it outputs an abnormality detection signal to the OR circuit 42. The OR circuit 42 receives an output signal (abnormality detection signal) from the overcurrent detection circuit 36 ​​and an output signal from an operation delay timer circuit 4 (described later). When one or both of the output signals from the current detection unit 60 are input to the OR circuit 42, the OR circuit 42 outputs an output signal to the AND circuit 37 and the lock circuit 38. When the abnormality detection signal is input, the lock circuit 38 outputs a lock signal to the operation determination circuit 32 to lock the tripping operation of the switching unit 54. In other words, when the lock signal is input to the lock circuit 38, the opening operation of the switching unit 54 is prohibited.

[0023] When a ground fault detection signal is input from the ground fault detection circuit 31, the operation determination circuit 32 determines whether or not a lock signal is input from the lock circuit 38. When a lock signal is not input, the operation determination circuit 32 outputs a trip operation permission signal to the OR circuit 39, and when a lock signal is input, the operation determination circuit 32 does not output a trip operation permission signal to the OR circuit 39.

[0024] The AND circuit 37 outputs a trip operation permission signal to the OR circuit 39 when it receives both the power failure detection signal from the power failure detection circuit 34 and the output signal from the OR circuit 42. As described above, the output signal from the OR circuit 42 corresponds to the output signal from the overcurrent detection circuit 36 ​​and / or the output signal from the operation delay timer circuit 4. That is, when it receives only the power failure detection signal from the power failure detection circuit 34 or only the output signal from the OR circuit 42, the AND circuit 37 does not output a trip operation permission signal to the OR circuit 39. When it receives the trip operation permission signal from the operation determination circuit 32 or the trip operation permission signal from the AND circuit 37, the OR circuit 39 outputs a trip operation request signal to the operation output circuit 40. The OR circuit 39 also outputs a trip operation request signal to the operation output circuit 40 when it receives trip operation permission signals from both the operation determination circuit 32 and the AND circuit 37.

[0025] The operation output circuit 40 closes the normally open contact 41 when a trip operation request signal is input from the OR circuit 39. This causes power to be supplied from the energy storage circuit 35 to the trip coil 56, causing the switching unit 54 to trip.

[0026] The vibration sensing unit 10 is provided with a vibration sensor 14, a vibration detection circuit 12, a reset timer circuit 8, a vibration detection test circuit 6, and an operation delay timer circuit 4. When the vibration sensor 14 detects vibrations of a predetermined value or greater, it outputs a detection signal to the vibration detection circuit 12. The vibration sensor 14 is adjusted so that it outputs a detection signal when it detects vibrations equivalent to a seismic intensity of 5, for example.

[0027] When a detection signal is input from the vibration sensor 14, the vibration detection circuit 12 outputs a vibration detection signal to the reset timer circuit 8 and the operation delay timer circuit 4. The reset timer circuit 8 starts counting when the input of the vibration detection signal from the vibration detection circuit 12 stops, and outputs a reset signal to the vibration sensor 14 when a predetermined time (e.g., 5 seconds) has elapsed. When the reset signal is input from the reset timer circuit 8, the vibration sensor 14 returns to its initial state. The predetermined time for the reset timer circuit 8 is arbitrary and may be, for example, 1 minute, 10 minutes, or 1 hour.

[0028] In addition to the vibration detection signal from the vibration detection circuit 12, the power outage detection signal from the power outage detection circuit 34 is also input to the operation delay timer circuit 4. The operation delay timer circuit 4 delays the vibration detection signal and the power outage detection signal and outputs them to the OR circuit 42. The OR circuit 42 outputs signals to the AND circuit 37 and the lock circuit 38. Specifically, when both the vibration detection signal and the power outage detection signal are continuously input for a predetermined time (e.g., 2 seconds), the operation delay timer circuit 4 outputs a signal to the AND circuit 37 and the lock circuit 38 via the OR circuit 42. In other words, if the input signal from the vibration detection circuit 12 or the power outage detection circuit 34 is less than the predetermined time, the operation delay timer circuit 4 does not output a signal to the OR circuit 42, and the signal from the operation delay timer circuit 4 is not input to the AND circuit 37 and the lock circuit 38. After outputting a signal to the OR circuit 42 (i.e., the AND circuit 37 and the lock circuit 38), the operation delay timer circuit 4 returns to its initial state. The predetermined time period of the operation delay timer circuit 4 is arbitrary and may be, for example, 1 second, 3 seconds, or 5 seconds.

[0029] The OR circuit 42 outputs a signal to the AND circuit 37 and the lock circuit 38 when it receives an overcurrent detection signal from the overcurrent detection circuit 36 ​​or an output signal (vibration detection signal, power outage detection signal) from the operation delay timer circuit 4. The OR circuit 39 also outputs a signal to the AND circuit 37 and the lock circuit 38 when it receives both the overcurrent detection signal from the overcurrent detection circuit 36 ​​and the output signal from the operation delay timer circuit 4.

[0030] The vibration detection test circuit 6 can input a test signal to the vibration detection circuit 12. That is, the vibration detection test circuit 6 can input a pseudo signal for confirming vibration detection to the vibration detection circuit 12. Furthermore, by providing the vibration detection test circuit 6, it is possible to check whether or not there is a malfunction in the vibration sensing unit 10 during periodic inspection of the control device 10.

[0031] As described above, in the high-voltage air switch 100, the ground fault detection circuit 31, the overcurrent detection circuit 36, the power failure detection circuit 34, other circuits required for SOG operation, and the vibration sensor 10 are all packaged integrally within the control device 30, which simplifies the circuit configuration within the control device 30 and enables the control device 30 to be made smaller. Also, since the high-voltage air switch 100 has all of the above-mentioned devices (sensors, circuits, etc.) integrated and arranged within the control device 30, the number of wiring connections does not increase compared to, for example, a high-voltage air switch without a vibration sensor. In other words, compared to, for example, a high-voltage air switch having a vibration sensor separate from the switch main body and the control device, the high-voltage air switch 100 can omit wiring connections between the vibration sensor and the switch main body or the control device, thereby eliminating the need for complicated work such as wiring connections.

[0032] (Operation of high-voltage air switch) The operation of the high-voltage air contactor 100 will be described below. First, a case where a ground fault occurs in the electric circuit 52 will be described. When a ground fault occurs in the electric circuit 52, a ground fault detection signal is input from the ground fault detection circuit 31 to the operation determination circuit 32. As described above, the operation determination circuit 32 determines whether or not a lock signal is input from the lock circuit 38. The lock circuit 38 outputs a lock signal to the operation determination circuit 32 when an overcurrent detection signal is input from the overcurrent detection circuit 36 ​​via the OR circuit 42 and / or when a signal is input from the operation delay timer circuit 4. In other words, the lock circuit 38 does not output a lock signal to the operation determination circuit 32 when an overcurrent detection signal is not input from the overcurrent detection circuit 36 ​​and a signal is not input from the operation delay timer circuit 4. Therefore, when a current greater than or equal to the overcurrent detection threshold does not flow in the electric circuit 52, a power outage occurs in the electric circuit 52, and the vibration detection circuit 12 (vibration sensor 14) does not detect vibrations greater than a predetermined value, a trip operation permission signal is output from the operation determination circuit 32 to the OR circuit 39, a trip operation request signal is output from the OR circuit 39 to the operation output circuit 40, the normally open contact 41 closes, and the trip coil 56 performs a trip operation on the opening / closing unit 54.

[0033] On the other hand, when a current equal to or greater than the overcurrent detection threshold flows in the electric circuit 52 (an abnormality detection signal is output from the overcurrent detection circuit 36 ​​to the lock circuit 38 via the OR circuit 42), a lock signal is output from the lock circuit 38 to the operation determination circuit 32, and therefore the tripping operation of the switching unit 54 is locked (the tripping operation is set to a preparation state). When a power outage occurs in the electric circuit 52, the power outage detection circuit 34 outputs a power outage detection signal to the AND circuit 37, and then the switching unit 54 performs a tripping operation. This prevents the switching unit 54 from being opened while an overcurrent is flowing in the electric circuit 52, and makes it possible to prevent a failure of the high-voltage air contactor 100 (switch body 50).

[0034] Furthermore, when the vibration detection circuit 12 (vibration sensor 14) detects vibrations equal to or greater than a predetermined value, a lock signal is output from the lock circuit 38 to the operation determination circuit 32, and the tripping operation of the switching unit 54 is locked (the tripping operation is set to a preparation state). When a power outage occurs in the electric circuit 52, the power outage detection circuit 34 outputs a power outage detection signal to the AND circuit 37, and then the switching unit 54 trips. Note that even when the vibration detection circuit 12 (vibration sensor 14) detects vibrations equal to or greater than a predetermined value and a power outage occurs in the electric circuit 52, the lock circuit 38 outputs a lock signal to the operation determination circuit 32; however, in this case, the tripping operation is performed regardless of whether or not a ground fault has occurred.

[0035] Next, we will explain what happens when an overcurrent fault occurs in the electric circuit 52, causing a power outage for the electric circuit 52. When an overcurrent fault occurs in the electric circuit 52, the current detection unit 60 outputs an abnormality detection signal to the AND circuit 37 and the lock circuit 38 via the OR circuit 42. Therefore, when a current greater than or equal to the overcurrent lock value flows through the electric circuit 52, the lock circuit 38 outputs a lock signal to the operation determination circuit 32, locking the trip operation of the switching unit 54. When a power outage occurs in the electric circuit 52, the power outage detection circuit 34 outputs a power outage detection signal to the AND circuit 37. When the abnormality detection signal from the current detection unit 60 and the power outage detection signal from the power outage detection circuit 34 are input to the AND circuit 37, the AND circuit 37 outputs a trip operation permission signal to the OR circuit 39. As a result, the OR circuit 39 outputs a trip operation request signal to the operation output circuit 40, the normally open contact 41 closes, and the trip coil 56 trips the switching unit 54. The switching unit 54 is prevented from being opened when an overcurrent is flowing through the electric circuit 52, and breakdown of the high voltage air switch 100 (switch body 50) can be prevented.

[0036] Next, we will explain the case where the vibration detection circuit 12 (vibration sensor 14) detects vibrations equal to or greater than a predetermined value and a power outage occurs in the electric circuit 52. This situation can typically occur when a power outage occurs due to an earthquake. When the power outage detection circuit 34 detects a power outage in the electric circuit 52, the power outage detection circuit 34 outputs a power outage detection signal to the AND circuit 37 and the operation delay timer circuit 4. As described above, when both the vibration detection signal and the power outage detection signal are continuously input for a predetermined time, the operation delay timer circuit 4 outputs a signal to the AND circuit 37 and the lock circuit 38 via the OR circuit 42. That is, only when the power outage detection signal from the power outage detection circuit 34 is continuously input to the operation delay timer circuit 4 for a predetermined time, the output signal (power outage detection signal) from the operation delay timer circuit 4 is input to the AND circuit 37 via the OR circuit 42. In other words, if the voltage of the electrical circuit 52 temporarily drops (the voltage drops for less than a predetermined time), the power outage detection signal from the power outage detection circuit 34 is input to the AND circuit 37 without passing through the OR circuit 42, but since no signal is output from the operation delay timer circuit 4 to the OR circuit 42, the output signal (power outage detection signal) from the operation delay timer circuit 4 is not input to the AND circuit 37.

[0037] When both the power outage detection signal from the power outage detection circuit 34 and the signal from the operation delay timer circuit 4 are input to the AND circuit 37, the AND circuit 37 outputs a trip operation permission signal to the OR circuit 39, the OR circuit 39 outputs a trip operation request signal to the operation output circuit 40, the normally open contacts 41 close, and the trip coil 56 performs the trip operation of the switching unit 54. In other words, when a power outage occurs in the electric circuit 52 due to the occurrence of an earthquake, the switching unit 54 is opened. As a result, when power is restored to the power system, power is prevented from being supplied to the load equipment, and the occurrence of secondary disasters such as fires can be prevented.

[0038] On the other hand, if the voltage of the electric circuit 52 only drops temporarily, the signal from the operation delay timer circuit 4 is not input to the AND circuit 37, and the switching unit 54 is not tripped. Therefore, the high-voltage air switchgear 100 can prevent the switching unit 54 from tripping when an extremely short-term power outage (instantaneous voltage drop) that is not generally called a power outage occurs and vibration that is not a disaster such as an earthquake is detected simultaneously. In other words, the high-voltage air switchgear 100 can prevent a malfunction such as the switching unit 54 tripping when it is not necessary to do so.

[0039] The signal from the action delay timer circuit 4 may be output directly to the OR circuit 39 or the action output circuit 40. In this case, the OR circuit 42 can be omitted. That is, the signal from the action delay timer circuit 4 does not have to be output to the AND circuit 37 and the lock circuit 38 via the OR circuit 42. Even in this case, if a power outage occurs in the electric circuit 52 due to the occurrence of an earthquake, the switching unit 54 will trip, and if the occurrence of a voltage drop and the detection of vibrations that are not a disaster such as an earthquake are simultaneously detected, the switching unit 54 can be prevented from tripping.

[0040] (Modifications of High-Voltage Air Switchgear: Second to Fifth Embodiments) The high voltage air switchgear 100a to 100d will be described below with reference to Figures 3 to 6. The high voltage air switchgear 100a to 100d are modified examples of the high voltage air switchgear 100. The high voltage air switchgears 100a to 100d have vibration sensing units 10a to 10d that have structures different from the vibration sensing unit 10 of the high voltage air switchgear 100. For the high voltage air switchgears 100a to 100d, the same reference numbers as those used for the high voltage air switchgear 100 will be used to designate the same components as those of the high voltage air switchgear 100, and descriptions thereof may be omitted.

[0041] (Second Example) As shown in FIG. 3, the vibration sensing unit 10a of the high-voltage air switch 100a is provided with a vibration sensor 14, a vibration detection circuit 12, a reset timer circuit 8, a vibration detection test circuit 6, a power outage continuation confirmation circuit 20, and an AND circuit 22. A power outage detection signal is input from a power outage detection circuit 34 to the power outage continuation confirmation circuit 20. The power outage continuation confirmation circuit 20 delays the power outage detection signal and outputs it to the AND circuit 22. Specifically, the power outage continuation confirmation circuit 20 outputs the power outage detection signal to the AND circuit 22 when the power outage detection signal has been input continuously for a predetermined time (e.g., 2 seconds). The predetermined time for the power outage continuation confirmation circuit 20 to detect the power outage detection signal is arbitrary and may be, for example, 1 second, 3 seconds, or 5 seconds.

[0042] The AND circuit 22 also receives a vibration detection signal from the vibration detection circuit 12. When both the power outage detection signal from the power outage continuation confirmation circuit 20 and the vibration detection signal from the vibration detection circuit 12 are input to the AND circuit 22, the AND circuit 22 outputs a signal to the OR circuit 42, and the output signal from the AND circuit 22 is input to the AND circuit 37 and the lock circuit 38 via the OR circuit 42. That is, if the power outage detection signal input from the power outage detection circuit 34 to the power outage continuation confirmation circuit 20 is less than a predetermined time, the AND circuit 22 does not output a signal to the OR circuit 42, and therefore the output signal from the AND circuit 22 is not input to the AND circuit 37, and the switching unit 54 does not trip. The high-voltage air switch 100a can also prevent a malfunction in which the switching unit 54 trips when it is not necessary. Note that in the high-voltage air switch 100a, the signal from the AND circuit 22 may also be output directly to the OR circuit 39 or the operation output circuit 40. The OR circuit 42 can be omitted. That is, the signal from the signal output circuit 24 does not have to be output to the AND circuit 37 and the lock circuit 38 via the OR circuit 42 .

[0043] (Third Example) As shown in FIG. 4, the vibration sensing unit 10b of the high-voltage air switch 100b includes a vibration sensor 14, a vibration detection circuit 12, a reset timer circuit 8, a vibration detection test circuit 6, an AND circuit 22, and a signal output circuit 24. A power outage detection signal from a power outage detection circuit 34 and a vibration detection signal from the vibration detection circuit 12 are input to the AND circuit 22. When both the power outage detection signal and the vibration detection signal are input to the AND circuit 22, the AND circuit 22 outputs a signal to the signal output circuit 24. The signal output circuit 24 delays the signal from the AND circuit 22 and outputs the signal to the AND circuit 37 and the lock circuit 38 via the OR circuit 42. Specifically, when the signal from the AND circuit 22 is continuously input for a predetermined time (e.g., 2 seconds), the signal output circuit 24 outputs a signal to the AND circuit 37 and the lock circuit 38 via the OR circuit 42. The predetermined time for the signal output circuit 24 to detect the signal from the AND circuit 22 is arbitrary and may be, for example, 1 second, 3 seconds, or 5 seconds.

[0044] In the high-voltage air contactor 100b, even if the power failure detection signal input from the power failure detection circuit 34 to the AND circuit 22 is present for less than a predetermined time, the AND circuit 22 outputs a signal to the signal output circuit 24. However, if the signal output from the AND circuit 22 to the signal output circuit 24 is present for less than the predetermined time, the signal output circuit 24 does not output a signal to the OR circuit 42. Therefore, the output signal of the AND circuit 22 is not output to the AND circuit 37. Therefore, the high-voltage air contactor 100b can also prevent a malfunction such as a tripping operation of the switching unit 54 when it is not necessary. Note that in the high-voltage air contactor 100b, the signal from the signal output circuit 24 may be output directly to the OR circuit 39 or the operation output circuit 40. The OR circuit 42 can be omitted. That is, the signal from the signal output circuit 24 does not need to be output to the AND circuit 37 and the locking circuit 38 via the OR circuit 42.

[0045] (Fourth Example) As shown in FIG. 5, the vibration sensing unit 10c of the high-voltage air contactor 100c includes a vibration sensor 14, a vibration detection circuit 12, a reset timer circuit 8, a vibration detection test circuit 6, an operation delay timer circuit 4, and a signal output circuit 24. The vibration sensing unit 10c can also be considered to have a structure in which the output signal of the operation delay timer circuit 4 of the vibration sensing unit 10c is input to the signal output circuit 24 (see also FIG. 2). In the high-voltage air contactor 100c, the operation delay timer circuit 4 delays the power failure detection signal from the power failure detection circuit 34, and the signal output circuit 24 further delays the output signal of the operation delay timer circuit 4. Therefore, the high-voltage air contactor 100c can more reliably prevent malfunctions such as tripping of the switching unit 54 when it is not necessary. In the high-voltage air contactor 100c, the signal of the signal output circuit 24 may also be output directly to the OR circuit 39 or the operation output circuit 40. The OR circuit 42 can be omitted. That is, the signal from the signal output circuit 24 does not have to be output to the AND circuit 37 and the lock circuit 38 via the OR circuit 42 .

[0046] (Fifth Example) As shown in FIG. 6, the vibration sensing unit 10d of the high-voltage air contactor 100d includes a vibration sensor 14, a vibration detection circuit 12, a reset timer circuit 8, a vibration detection test circuit 6, a power outage continuation confirmation circuit 20, an AND circuit 22, and a signal output circuit 24. The vibration sensing unit 10d can be considered to have a structure in which the output signal of the AND circuit 22 of the vibration sensing unit 10a is input to the signal output circuit 24 (see also FIG. 3). Alternatively, the vibration sensing unit 10d can be considered to have a structure in which the power outage detection signal from the power outage detection circuit 34 is input to the AND circuit 22 via the power outage continuation confirmation circuit 20 (see also FIG. 4). In the high-voltage air contactor 100d, the power outage detection signal from the power outage detection circuit 34 is delayed by the power outage continuation confirmation circuit 20, and the output signal of the AND circuit 22 is further delayed by the signal output circuit 24. Therefore, the high-voltage air contactor 100d can more reliably prevent malfunctions such as tripping of the switching unit 54 when it is not necessary. In the high voltage air contactor 100d as well, the signal from the signal output circuit 24 may be output directly to the OR circuit 39 or the operation output circuit 40. The OR circuit 42 can be omitted. That is, the signal from the signal output circuit 24 does not have to be output to the AND circuit 37 and the lock circuit 38 via the OR circuit 42.

[0047] (Another variation 1 of the high-voltage air switch) Although not shown, the high voltage air switchgear of Modification 1 is configured by omitting the zero-phase-sequence current transformer 58 from the switch body 50 (see FIG. 1) and omitting the ground fault detection circuit 31, operation determination circuit 32, lock circuit 38, and OR circuit 39 from the control device 30 (see FIGS. 2 to 6) in the above-mentioned high voltage air switchgears 100, 100a, 100b, 100c, and 100d. That is, the high voltage air switchgear of Modification 1 is configured by connecting a control device 30 having any of the vibration sensing units 10, 10a, 10b, 10c, and 10d therein to a switch body having only an overcurrent protection function (SO function) and no ground fault function (GR function). This type of high voltage air switchgear can also prevent a malfunction such as the switching unit 54 performing a tripping operation when it is not required.

[0048] (Another variation 2 of the high-voltage air switch) Although not shown, the high voltage air switchgear of the second modification is obtained by omitting the zero-phase-sequence current transformer 58 from the switch body 50 (see FIG. 1) and omitting the ground fault detection circuit 31, the operation determination circuit 32, the lock circuit 38 and the OR circuit 42 from the control device 30 (see FIGS. 2 to 6) in the above-mentioned high voltage air switchgears 100, 100a, 100b, 100c and 100d. That is, the high voltage air switchgear of the second modification is obtained by connecting any one of a control device (see FIG. 2) of a type in which the output signal of the operation delay timer circuit 4 is directly input to the OR circuit 39, a control device (see FIG. 3) of a type in which the output signal of the AND circuit 22 is directly input to the OR circuit 39, and a control device (see FIGS. 4 to 6) of a type in which the output signal of the signal output circuit 24 is directly input to the OR circuit 39 to a switch body having only an overcurrent protection function (SO function) and not a ground fault function (GR function). This type of high-voltage air switch can also prevent the problem of tripping the switching unit 54 when it is not necessary.

[0049] (Another variation 3 of the high-voltage air switch) Although not shown, the high voltage air circuit breaker of Modification 2 is the same as the high voltage air circuit breakers 100, 100a, 100b, 100c, and 100d described above, except that the current detection unit 60 is omitted from the switch body 50 (see FIG. 1), and the overcurrent detection circuit 36, the lock circuit 38, and the operation determination circuit 32 are omitted from the control device 30 (see FIGS. 2 to 6). That is, the high voltage air circuit breaker of Modification 3 is a switch body having only a ground fault function (GR function) and no overcurrent protection function (SO function), and a control device 30 having any of the vibration detection units 10, 10a, 10b, 10c, and 10d therein is connected to the switch body. Furthermore, the AND circuit 37 may be omitted, and the output signal of the operation delay timer circuit 4 may be directly input to the OR circuit 39 (see FIG. 2), the output signal of the AND circuit 22 may be directly input to the OR circuit 39 (see FIG. 3), or the output signal of the signal output circuit 24 may be directly input to the OR circuit 39 (). This type of high-voltage air switch can also prevent the problem of tripping the switching unit 54 when it is not necessary.

[0050] (Other variations) Instead of an overcurrent locking type (SOG type) high-voltage air circuit breaker (see FIG. 1), a control device 30 (see FIGS. 2 to 6) having any of the vibration sensors 10, 10a, 10b, 10c, and 10d inside may be connected to an overcurrent storage trip with earth fault storage trip (SOSG type) high-voltage air circuit breaker. In the overcurrent locking type (SOG type) high-voltage air circuit breaker 100 (see FIGS. 1 and 2), only the vibration detection signal from the vibration detection circuit 12 may be input to the operation delay timer circuit 4 without inputting the power outage detection signal from the power outage detection circuit 34. Even with this configuration, the switching unit 54 will open when a power outage occurs in the electric circuit 52 due to the occurrence of an earthquake. The high-voltage air circuit breakers 100, 100a, 100b, 100c, and 100d may be provided with a lighting lamp that lights up when an overcurrent is detected and / or a lighting lamp that lights up when vibration is detected.

[0051] Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and variations of the specific examples exemplified above. Furthermore, the technical elements described in this specification or drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Furthermore, the technology exemplified in this specification or drawings can achieve multiple objectives simultaneously, and achieving one of these objectives itself has technical utility. [Explanation of symbols]

[0052] 14: Vibration sensing means 30: Control device 34: Power outage detection means 54:Electric circuit 60: Overcurrent detection means 100: Switch

Claims

1. A switch including an overcurrent detection means for detecting an overcurrent fault in an electric circuit, a power outage detection means for detecting a power outage in the electric circuit, a vibration detection means for detecting vibrations, and a control device in which the vibration detection means is provided, The control device includes an operation delay means for receiving output signals from the power failure detection means and the vibration sensing means, The control device The overcurrent detection means detects an overcurrent fault in the electric circuit and the power outage detection means detects a power outage in the electric circuit, or the vibration detection means detects vibration and the power outage detection means detects a power outage in the electric circuit, Furthermore, the operation delay means outputs a signal to trip the switch body when both the output signal of the power failure detection means and the output signal of the vibration sensing means are input for a predetermined period of time, thereby causing the switch body to trip.

2. A switch comprising: overcurrent detection means for detecting an overcurrent fault in an electric circuit; earth fault detection means for detecting an earth fault in the electric circuit; power outage detection means for detecting a power outage in the electric circuit; vibration detection means for detecting vibration; and a control device in which the vibration detection means is provided, The control device includes an operation delay means for receiving output signals from the power failure detection means and the vibration sensing means, The control device When the overcurrent detection means detects an overcurrent fault in the electric circuit, the switch body is set to a ready state for tripping; A vibration sensing device in which an operation delay means outputs a signal to trip a switch body when both the output signal of the power failure detection means and the output signal of the vibration sensing means are input for a predetermined time, and trips the switch body in any of the following cases (1) to (3). (1) When an overcurrent fault is detected by the overcurrent detection means and a power outage in the electrical circuit is detected by the power outage detection means (2) When a ground fault is detected by the ground fault detection means and an overcurrent fault is not detected by the overcurrent detection means (3) When vibration is detected by the vibration sensing means and a power outage in the electric circuit is detected by the power outage detection means.

3. A switch including a ground fault detection means for detecting a ground fault in an electric circuit, a power outage detection means for detecting a power outage in the electric circuit, a vibration sensing means for detecting vibrations, and a control device in which the vibration sensing means is provided, The control device includes an operation delay means for receiving output signals from the power failure detection means and the vibration sensing means, The control device detects a ground fault by the ground fault detection means, or detects vibration by the vibration sensing means and detects a power outage in the electric circuit by the power outage detection means, Furthermore, the operation delay means outputs a signal to trip the switch body when both the output signal of the power failure detection means and the output signal of the vibration sensing means are input for a predetermined period of time, thereby causing the switch body to trip.

4. A switch including an overcurrent detection means for detecting an overcurrent fault in an electric circuit, a power outage detection means for detecting a power outage in the electric circuit, a vibration detection means for detecting vibrations, and a control device in which the vibration detection means is provided, The control device is provided with a power outage continuation confirmation means for confirming the continuation of a signal from the power outage detection means, and an AND circuit for receiving output signals from the power outage detection means and the vibration sensing means, The control device The overcurrent detection means detects an overcurrent fault in the electric circuit and the power outage detection means detects a power outage in the electric circuit, or the vibration detection means detects vibration and the power outage detection means detects a power outage in the electric circuit, Furthermore, the power outage continuation confirmation means outputs a signal to the AND circuit when the output signal of the power outage detection means is input continuously for a predetermined time, A switch that outputs a signal to trip the switch body when the AND circuit receives signals from the power outage continuation confirmation means and the vibration detection means, thereby tripping the switch body.

5. A switch comprising: overcurrent detection means for detecting an overcurrent fault in an electric circuit; earth fault detection means for detecting an earth fault in the electric circuit; power outage detection means for detecting a power outage in the electric circuit; vibration detection means for detecting vibration; and a control device in which the vibration detection means is provided, The control device is provided with a power outage continuation confirmation means for confirming the continuation of a signal from the power outage detection means, and an AND circuit for receiving output signals from the power outage detection means and the vibration sensing means, The control device When the overcurrent detection means detects an overcurrent fault in the electric circuit, the switch body is set to a ready state for tripping; The power outage continuation confirmation means outputs a signal to the AND circuit when the output signal of the power outage detection means is input continuously for a predetermined time, When the AND circuit receives signals from the power outage continuation confirmation means and the vibration detection means, it outputs a signal to trip the switch body, A vibration sensing device that trips the switch body in any of the following cases (1) to (3): (1) When an overcurrent fault is detected by the overcurrent detection means and a power outage in the electrical circuit is detected by the power outage detection means (2) When a ground fault is detected by the ground fault detection means and an overcurrent fault is not detected by the overcurrent detection means (3) When vibration is detected by the vibration sensing means and a power outage in the electric circuit is detected by the power outage detection means.

6. A switch including a ground fault detection means for detecting a ground fault in an electric circuit, a power outage detection means for detecting a power outage in the electric circuit, a vibration sensing means for detecting vibrations, and a control device in which the vibration sensing means is provided, The control device is provided with a power outage continuation confirmation means for confirming the continuation of a signal from the power outage detection means, and an AND circuit for receiving output signals from the power outage detection means and the vibration sensing means, The control device detects a ground fault by the ground fault detection means, or detects vibration by the vibration sensing means and detects a power outage in the electric circuit by the power outage detection means, Furthermore, the power outage continuation confirmation means outputs a signal to the AND circuit when the output signal of the power outage detection means is input continuously for a predetermined time, A switch that outputs a signal to trip the switch body when the AND circuit receives signals from the power outage continuation confirmation means and the vibration detection means, thereby tripping the switch body.

7. A switch including an overcurrent detection means for detecting an overcurrent fault in an electric circuit, a power outage detection means for detecting a power outage in the electric circuit, a vibration detection means for detecting vibrations, and a control device in which the vibration detection means is provided, The control device is provided with an AND circuit that receives output signals from the power failure detection means and the vibration sensing means, and a signal output means that receives the output signal from the AND circuit, The control device The overcurrent detection means detects an overcurrent fault in the electric circuit and the power outage detection means detects a power outage in the electric circuit, or the vibration detection means detects vibration and the power outage detection means detects a power outage in the electric circuit for a predetermined period of time, Furthermore, the switch outputs a signal for tripping the switch body when the signal output means receives the output signal of the AND circuit continuously for a predetermined time, thereby tripping the switch body.

8. A switch comprising: overcurrent detection means for detecting an overcurrent fault in an electric circuit; earth fault detection means for detecting an earth fault in the electric circuit; power outage detection means for detecting a power outage in the electric circuit; vibration detection means for detecting vibration; and a control device in which the vibration detection means is provided, The control device is provided with an AND circuit that receives output signals from the power failure detection means and the vibration sensing means, and a signal output means that receives the output signal from the AND circuit, The control device When the overcurrent detection means detects an overcurrent fault in the electric circuit, the switch body is set to a ready state for tripping; A vibration sensing device in which, when the signal output means receives an output signal from an AND circuit continuously for a predetermined time, it outputs a signal to trip the switch body, and trips the switch body in any of the following cases (1) to (3): (1) When an overcurrent fault is detected by the overcurrent detection means and a power outage in the electrical circuit is detected by the power outage detection means (2) When a ground fault is detected by the ground fault detection means and an overcurrent fault is not detected by the overcurrent detection means (3) When vibration is detected by the vibration sensing means and a power outage in the electric circuit is detected by the power outage detection means.

9. A switch including a ground fault detection means for detecting a ground fault in an electric circuit, a power outage detection means for detecting a power outage in the electric circuit, a vibration sensing means for detecting vibrations, and a control device in which the vibration sensing means is provided, The control device is provided with an AND circuit that receives output signals from the power failure detection means and the vibration sensing means, and a signal output means that receives the output signal from the AND circuit, The control device detects a ground fault by the ground fault detection means, or detects vibration by the vibration sensing means, and detects a power outage in the electric circuit for a predetermined period of time by the power outage detection means, Furthermore, the switch outputs a signal for tripping the switch body when the signal output means receives the output signal of the AND circuit continuously for a predetermined time, thereby tripping the switch body.

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