JP7467781B2 - System for monitoring condition of circuit breaker spring operating mechanism, and method for monitoring circuit breaker spring operating mechanism - Google Patents

Description

An embodiment of the present invention relates to a condition monitoring system for a spring operating mechanism for a circuit breaker, and a method for monitoring a spring operating mechanism for a circuit breaker.

Generally, power plants, substations, and switching yards are equipped with circuit breakers and circuit breaker operating devices that open and close the circuit breakers. In recent years, circuit breaker operating devices that use a spring operating mechanism have become mainstream. The spring operating mechanism is required to quickly move a movable contact that can come into contact with the fixed contact of the circuit breaker between a breaking position, which is an open position, and a closing position, which is a closed position.

However, because the spring operating mechanism is housed inside the housing, it is extremely difficult to detect defects in the part from its appearance. For this reason, there is a demand for a monitoring system that can automatically detect abnormalities in the spring operating mechanism and identify the location of the abnormality.

Japanese Patent Publication No. 2010-160926

The problem that this invention aims to solve is to provide a condition monitoring system for a spring operating mechanism for a circuit breaker that can automatically detect abnormalities in the spring operating mechanism and identify the location of the abnormality, and a method for monitoring a spring operating mechanism for a circuit breaker.

The state monitoring system for a spring operating mechanism for a circuit breaker of the embodiment is a state monitoring system for a spring operating mechanism for a circuit breaker that reciprocates the movable contact of the circuit breaker to transition the circuit breaker between an interrupted state and a closed state. The spring operating mechanism has an output rod, an interrupting spring, a closing spring, an electric motor, an interrupting electromagnetic solenoid, and a closing electromagnetic solenoid. The output rod is connected to the movable contact. The interrupting spring is locked to a charged state in the closed state, and is released when the circuit breaker is transitioned from the closed state to the interrupted state. The closing spring is locked to a charged state in the interrupting state, and is released and charges the interrupting spring when the circuit breaker is transitioned from the interrupting state to the closed state. The electric motor charges the closing spring. The interrupting electromagnetic solenoid unlocks the interrupting spring in the charged state in the closed state. The closing electromagnetic solenoid unlocks the closing spring in the charged state in the interrupting state. The condition monitoring system has a displacement sensor, a current sensor, a measurement value recording unit, a one-dimensional equivalent circuit network calculation unit, a condition determination unit, and an abnormality location identification unit. The displacement sensor measures the displacement of the output rod. The current sensor measures the current flowing through the cut-off electromagnetic solenoid, the closing electromagnetic solenoid, and the electric motor. The measurement value recording unit records the measurement results of the displacement sensor and the current sensor as measurement value data in a storage device. The one-dimensional equivalent circuit network calculation unit calculates calculated value data representing the condition of the spring operating mechanism by applying the measurement value data to a one-dimensional equivalent circuit network model of the spring operating mechanism in which parameters for each component and interaction relationships between the components are specified. The condition determination unit determines whether the condition of any component of the spring operating mechanism is abnormal based on a comparison result between the measurement value data and normal state calculated value data calculated by the one-dimensional equivalent circuit network calculation unit using parameters for the normal state. When the condition determination unit determines that the condition of any component is abnormal, the abnormality identification unit changes the parameters so that the difference between the measurement value data and the calculated value data is within a preset range, and identifies the component associated with the parameters that differ by more than a standard compared to the parameters in the normal state at the time the parameters are changed as the abnormality.

1 is a diagram showing a circuit breaker and a circuit breaker spring operating device according to an embodiment; FIG. 2 is a development view showing a closed state of the circuit breaker spring operating mechanism according to the embodiment; FIG. 4 is a view of the circuit breaker spring operation mechanism according to the embodiment, as viewed from the +Y direction. FIG. 2 is a development view showing a disconnecting state of the circuit breaker spring operating mechanism according to the embodiment; FIG. 4 is a development view showing a state immediately after a closing operation is completed in the circuit breaker spring operating mechanism according to the embodiment. FIG. 6 is a diagram showing an example of a one-dimensional equivalent circuit network model of the circuit breaker spring operating mechanism described in FIGS. 1 to 5. 5A and 5B are diagrams for explaining a process performed by a state determination unit according to the embodiment. FIG. 4 is a diagram showing a circuit breaker and a circuit breaker spring operating device according to a first modified example of the embodiment. FIG. 13 is a diagram showing a circuit breaker and a circuit breaker spring operating device according to a second modified example of the embodiment.

Below, the status monitoring system for a spring operating mechanism for a circuit breaker and the monitoring method for a spring operating mechanism for a circuit breaker of an embodiment are described with reference to the drawings.

FIG. 1 is a diagram showing a circuit breaker and a spring operating device for a circuit breaker according to an embodiment.
As shown in Fig. 1, the circuit breaker spring operating device 1 is an operating device that operates to open and close a circuit breaker 90. For example, the circuit breaker 90 is a gas circuit breaker. The circuit breaker 90 includes a fixed contact 91 and a movable contact 92 that can come into contact with and separate from the fixed contact 91. The circuit breaker spring operating device 1 moves the movable contact 92 between a break position where the movable contact 92 separates from the fixed contact 91 to open the circuit breaker 90 and a close position where the movable contact 92 comes into contact with the fixed contact 91 to close the circuit breaker 90. The circuit breaker spring operating device 1 includes a circuit breaker spring operating mechanism 2 mechanically linked to the circuit breaker 90, and a state monitoring system 100 for the circuit breaker spring operating mechanism 2.

The circuit breaker spring operating mechanism 2 reciprocates the movable contact 92 of the circuit breaker 90 to switch the circuit breaker 90 between an interrupted state in which the movable contact 92 is in the interrupted position and an on state in which the movable contact 92 is in the on position. The circuit breaker spring operating mechanism 2 includes an output rod 4 connected to the movable contact 92, an interrupter spring section 10 which is a drive source for moving the movable contact 92 from the on position to the interrupted position, an interrupter spring interlocking section 20 which is driven in conjunction with the operation of the interrupter spring section 10, a closing spring section 30 which is a drive source for moving the movable contact 92 from the interrupted position to the on position, a closing spring interlocking section 40 which is driven in conjunction with the operation of the closing spring section 30, and a frame 6 which houses or supports the main movable parts of the circuit breaker spring operating mechanism 2. In the following description of the configuration of the circuit breaker spring operating mechanism 2, the circuit breaker spring operating mechanism 2 in the on state will be described unless otherwise specified.

For convenience of explanation, the +X direction, -X direction, +Y direction, -Y direction, +Z direction, and -Z direction are defined here. The -X direction is the opposite direction to the +X direction. When the +X direction and the -X direction are not distinguished, they are simply referred to as the "X direction". The +Y direction and the -Y direction are perpendicular to the X direction. The -Y direction is the opposite direction to the +Y direction. When the +Y direction and the -Y direction are not distinguished, they are simply referred to as the "Y direction". The +Z direction and the -Z direction are perpendicular to the X direction and the Y direction. The -Z direction is the opposite direction to the +Z direction. When the +Z direction and the -Z direction are not distinguished, they are simply referred to as the "Z direction". In each figure, the direction in which the arrow points is the + direction. In this embodiment, the Z direction is the vertical direction, and the X direction and the Y direction are the horizontal directions. Also, in this embodiment, the +Z direction is vertically upward, and the -Z direction is vertically downward. In the following description, the direction of rotation of a rotor that rotates about an axis extending in the Y direction will be described as the direction of rotation as viewed from the +Y direction.

The frame 6 is arranged in the +X direction of the circuit breaker 90. The frame 6 is fixedly arranged with respect to immovable parts such as the tank 93 of the circuit breaker 90.

The output rod 4 extends in the X direction. A first end of the output rod 4 in the -X direction is connected to the movable contact 92 inside the tank 93 of the circuit breaker 90. The output rod 4 passes through the tank 93 of the circuit breaker 90 so as to be displaceable in the X direction. The output rod 4 moves the movable contact 92 from the closing position toward the breaking position by displacing in the +X direction. The output rod 4 moves the movable contact 92 from the breaking position toward the closing position by displacing in the -X direction.

FIG. 2 is a development view showing the circuit breaker spring operating mechanism according to the embodiment in a closed state.
As shown in FIG. 2, the shutoff spring unit 10 includes a shutoff spring 11, which is a compression coil spring, a shutoff spring receiver 12 that receives the movable end of the shutoff spring 11, a shutoff spring link 13 connected to the shutoff spring interlocking unit 20, and a damper 14 supported by the shutoff spring receiver 12. The shutoff spring 11 is disposed in the +Z direction of the frame 6. The shutoff spring 11 is disposed so that the expansion and contraction direction coincides with the Z direction. The lower end of the shutoff spring 11 is supported by the frame 6 as a fixed end. The upper end of the shutoff spring 11 is provided as a movable end. The shutoff spring 11 is locked in a charged (compressed) state by a shutoff spring lock mechanism 60, which will be described later. The shutoff spring receiver 12 moves up and down together with the upper end of the shutoff spring 11 as the shutoff spring 11 expands and contracts. The shutoff spring link 13 is disposed so as not to be able to move up and down relative to the shutoff spring receiver 12. The shutoff spring link 13 protrudes downward toward the inside of the frame 6. The damper 14 has a cylinder 15 and a piston 16 arranged in the cylinder 15 so as to be slidable in translation. The cylinder 15 is fixed to the break spring bearing 12. The cylinder 15 protrudes downward from the break spring bearing 12 inside the break spring 11. The cylinder 15 is connected to the upper end of the break spring link 13, and connects the break spring bearing 12 and the break spring link 13. The piston 16 protrudes upward from the cylinder 15 and the break spring bearing 12. The piston 16 is movable up and down relative to the cylinder 15. The upper end of the piston 16 faces a stopper 6a fixed to the frame 6 from below.

The cut-off spring interlocking section 20 comprises a main link 21 connected to the output rod 4, a main lever 22 connected to the cut-off spring section 10 and the main link 21, a main/sub connecting link 23 connected to the main lever 22, a first shaft 24 rotatably supported on the frame 6, a sub-lever 25 fixed to the first shaft 24, a latch lever 26 and a cam lever 27.

The main link 21 includes a first connection part 21a rotatably connected to the end of the output rod 4 in the +X direction, and a second connection part 21b rotatably connected to the main lever 22 at a position in the +X direction from the first connection part 21a. This allows the main link 21 to connect the output rod 4 and the main lever 22. The first connection part 21a is disposed outside the frame 6. The second connection part 21b is disposed inside the frame 6.

The main lever 22 is disposed within the frame 6. The main lever 22 is supported by a bearing on the second shaft 41 described later. The main lever 22 is disposed rotatably around the central axis Q extending in the Y direction of the second shaft 41. The main lever 22 includes a first arm 22a rotatably connected to the second connection portion 21b of the main link 21, a second arm 22b rotatably connected to the lower end of the breaking spring link 13, and a third arm 22c rotatably connected to the main/sub connecting link 23. The first arm 22a is connected to the second connection portion 21b of the main link 21 at a position in the +Z direction from the central axis Q. The second arm 22b is connected to the breaking spring link 13 at a position in the -X direction from the central axis Q and in the -Z direction from the connection portion between the first arm 22a and the main link 21. The third arm 22c is connected to the main/sub connecting link 23 at a position in the -Z direction from the central axis Q and in the +X direction from the connection portion between the second arm 22b and the breaking spring link 13. The main lever 22 is biased in the clockwise direction by the breaking spring portion 10, and is restricted from rotating in the clockwise direction by the breaking spring lock mechanism 60.

The main/sub connecting link 23 includes a first connection part that is rotatably connected to the third arm 22c of the main lever 22, and a second connection part that is connected to the sub lever 25 at a position closer to the rotation center (central axis Q) of the main lever 22 than the first connection part in the -X direction. In this way, the main/sub connecting link 23 connects the main lever 22 and the sub lever 25.

The first shaft 24 is rotatably supported by the frame 6. The first shaft 24 has a central axis P extending in the Y direction. The central axis P is located in the -X direction from the center of rotation of the main lever 22 (central axis Q).

The sub-lever 25 rotates integrally with the first shaft 24 around the central axis P. The sub-lever 25 is connected to the main/sub connecting link 23 at a position in the positive direction from the central axis P.

The latch lever 26 rotates integrally with the first shaft 24 around the central axis P. The latch lever 26 is disposed in a position in the -Y direction from the sub-lever 25. A roller 26a is provided at the tip of the latch lever 26. The roller 26a is capable of rotating around an axis extending in the Y direction.

The cam lever 27 rotates integrally with the first shaft 24 around the central axis P. The cam lever 27 is disposed between the sub-lever 25 and the latch lever 26 in the Y direction. A roller 27a is provided at the tip of the cam lever 27. The roller 27a is capable of rotating around an axis extending in the Y direction.

The closing spring section 30 includes a closing spring 31, which is a compression coil spring, and a closing spring receiver 32 that receives the movable end of the closing spring 31. The closing spring 31 is disposed in the +Z direction of the frame 6. The closing spring 31 is disposed in the +X direction from the cutoff spring 11. The closing spring 31 is disposed so that the direction of expansion and contraction coincides with the Z direction. The lower end of the closing spring 31 is supported by the frame 6 as a fixed end. The upper end of the closing spring 31 is provided as a movable end. The closing spring 31 is locked in a charged (compressed) state by a closing spring lock mechanism 80, which will be described later. The closing spring receiver 32 moves up and down together with the upper end of the closing spring 31 as the closing spring 31 expands and contracts. A pin 33 is disposed in the closing spring receiver 32. A closing link 43, which will be described later, is rotatably connected to the pin 33. The closing spring section 30 may be provided with a plurality of closing springs. In this case, the closing spring receiver is configured to collectively receive the movable ends of all the closing springs.

The closing spring interlocking section 40 comprises a second shaft 41 rotatably supported on the frame 6, a closing lever 42 fixed to the second shaft 41, a closing link 43 connecting the closing spring section 30 and the closing lever 42, and a closing cam 44 fixed to the second shaft 41.

The second shaft 41 is rotatably supported by the frame 6. The second shaft 41 has a central axis Q extending in the Y direction. The central axis Q is located in the +X direction relative to the central axis P of the first shaft 24. The second shaft 41 rotatably supports the main lever 22 via a bearing.

The closing lever 42 rotates integrally with the second shaft 41 around the central axis Q. The closing lever 42 is positioned in the -Y direction from the latch lever 26.

The closing link 43 moves up and down together with the closing spring holder 32 as the closing spring 31 expands and contracts. The closing link 43 is arranged in the -Y direction of the frame 6. The closing link 43 has a first connection part 43a rotatably connected to the pin 33 of the closing spring holder 32, and a second connection part 43b rotatably connected to the closing lever 42. The closing link 43 is rotatable around an axis extending in the Y direction relative to the closing spring holder 32. The closing link 43 extends downward from the first connection part 43a. The second connection part 43b is arranged in a position further in the -Z direction than the first connection part 43a and in the +X direction than the central axis Q. The closing link 43 receives the elastic return force of the closing spring 31 and biases the closing lever 42 in the counterclockwise direction.

The insertion cam 44 rotates integrally with the second shaft 41 around the central axis Q. The insertion cam 44 is disposed at a position in the Y direction corresponding to the cam lever 27. The insertion cam 44 has a cam surface 44a. The cam surface 44a extends so as to move away from the central axis Q in the clockwise direction. The roller 27a of the cam lever 27 rolls on the cam surface 44a.

FIG. 3 is a view of the circuit breaker spring operating mechanism according to the embodiment as viewed from the +Y direction.
As shown in FIG. 3 , the circuit breaker spring operating mechanism 2 further includes an energy storage mechanism 50 that imparts elastic energy to the closing spring portion 30 .

The energy storage mechanism 50 stores energy in the released closing spring 31. The energy storage mechanism 50 includes an electric motor 51 as a drive source, a lever drive unit 52 that receives the output of the electric motor 51 to rotate the closing lever 42, and a transmission unit 53 that transmits the output of the electric motor 51 to the lever drive unit 52. The electric motor 51 is fixed to the frame 6. For example, the transmission unit 53 is a chain-type transmission mechanism having a sprocket and a roller chain. The lever drive unit 52 has a reducer, etc.

As shown in FIG. 2, the circuit breaker spring operating mechanism 2 further includes a breaking spring locking mechanism 60 that releasably locks the breaking spring 11 in the charged state, and a closing spring locking mechanism 80 that releasably locks the closing spring 31 in the charged state.

The cut-off spring lock mechanism 60 restricts the displacement of the cut-off spring interlocking portion 20, thereby restricting the clockwise rotation of the main lever 22 and the release of the cut-off spring 11. The cut-off spring lock mechanism 60 includes a lock lever 61 that locks the latch lever 26, and a lever restricting portion 71 that restricts the rotation of the lock lever 61 so that it can be released.

The locking lever 61 comprises a lever body 62 and a latch 63. The lever body 62 is supported by the second shaft 41 via a bearing. The lever body 62 is rotatable around the central axis Q relative to the frame 6. The lever body 62 is disposed at a position corresponding to the latch lever 26 in the Y direction. The lever body 62 is biased in the clockwise direction by a compressed return spring 64, with clockwise rotation restricted.

The latch 63 is supported by the lever body 62. The latch 63 is rotatable around an axis extending in the Y direction relative to the lever body 62. The latch 63 is biased in the clockwise direction by a compressed return spring 65 in a state where clockwise rotation is restricted. The latch 63 protrudes from the lever body 62 when viewed from the Y direction. The latch 63 contacts the roller 26a of the latch lever 26 in the counterclockwise direction centered on the central axis P. The latch 63 is pressed in the clockwise direction by the latch lever 26. The lever body 62 is pressed in the counterclockwise direction via the latch 63 by the counterclockwise force of the latch lever 26. The lever body 62 is restricted from rotating in the counterclockwise direction by the lever restriction portion 71. As a result, the locking lever 61 restricts the counterclockwise rotation of the latch lever 26.

The lever regulating unit 71 includes a cutoff regulating lever 72, a return spring 73, and a cutoff electromagnetic solenoid 74. The cutoff regulating lever 72 is rotatable around an axis extending in the Y direction relative to the frame 6. The cutoff regulating lever 72 includes a locking portion 75 having a cross section in a sector shape (half moon shape) centered on the rotation center of the cutoff regulating lever 72. The outer peripheral surface 75a of the locking portion 75 contacts a claw 62a provided on the lever body 62 of the locking lever 61 from the counterclockwise direction centered on the central axis Q and is locked to the lever body 62. The return spring 73 biases the cutoff regulating lever 72 in the clockwise direction. The cutoff electromagnetic solenoid 74 includes a plunger 74a, which is a driving unit. The cutoff electromagnetic solenoid 74 restricts the clockwise rotation of the cutoff regulating lever 72 by bringing the plunger 74a into contact with the cutoff regulating lever 72. The cutoff electromagnetic solenoid 74 projects a plunger 74 a based on a command from the circuit breaker 90 or the like, thereby rotating the cutoff restriction lever 72 counterclockwise.

The closing spring lock mechanism 80 restricts the displacement of the closing spring interlocking part 40, thereby restricting the counterclockwise rotation of the closing lever 42 and the release of the closing spring 31. The closing spring lock mechanism 80 includes a lever restricting part 81 that restricts the rotation of the closing lever 42 so as to be releasable.

The lever regulating unit 81 includes a restricting lever 82 for inserting, a return spring 83, and an electromagnetic solenoid 84 for inserting. The restricting lever 82 for inserting is rotatable around an axis extending in the Y direction relative to the frame 6. The restricting lever 82 for inserting is provided with a locking portion 85 having a cross-sectional sector shape (half-moon shape) centered on the rotation center of the restricting lever 82 for inserting. The outer peripheral surface 85a of the locking portion 85 contacts a claw 42a provided on the inserting lever 42 from the counterclockwise direction centered on the central axis Q, and is locked to the inserting lever 42. The return spring 83 biases the restricting lever 82 for inserting in the clockwise direction. The electromagnetic solenoid 84 for inserting is provided with a plunger 84a as a driving unit. The electromagnetic solenoid 84 for inserting restricts the clockwise rotation of the restricting lever 82 for inserting by bringing the plunger 84a into contact with the restricting lever 82 for inserting. The closing electromagnetic solenoid 84 protrudes a plunger 84a based on a command from a circuit breaker 90 or the like, thereby rotating the closing restriction lever 82 counterclockwise.

The operation of the circuit breaker spring operating mechanism 2 of this embodiment will be described with reference to Figures 2, 4, and 5. Figure 4 is an exploded view showing the circuit breaker spring operating mechanism of the embodiment in a cutoff state. Figure 5 is an exploded view showing the circuit breaker spring operating mechanism of the embodiment in a state immediately after the closing operation is completed.

The following describes the interruption operation that transitions the circuit breaker 90 from the on state to the off state. As shown in FIG. 2, when the circuit breaker 90 is in the on state and an interruption command is issued from the circuit breaker 90, the interruption electromagnetic solenoid 74 of the interruption spring lock mechanism 60 is activated. The interruption electromagnetic solenoid 74 protrudes the plunger 74a and rotates the interruption restriction lever 72 in the counterclockwise direction against the biasing force of the return spring 73. When the interruption restriction lever 72 rotates in the counterclockwise direction, the outer peripheral surface 75a of the locking portion 75 slides against the claw 62a of the lever body 62 of the locking lever 61. When the claw 62a rides over the clockwise edge of the outer peripheral surface 75a of the locking portion 75, the lever body 62 is released from the locking portion 75 and becomes able to rotate in the counterclockwise direction.

Here, the latch lever 26 presses the lock lever 61 in the counterclockwise direction due to the elastic return force of the cutoff spring 11. Therefore, when the lever body 62 of the lock lever 61 is released from the locking portion 75, the latch lever 26 pushes the lock lever 61 in the counterclockwise direction around the central axis Q while resisting the biasing force of the return spring 64, and releases from the lock lever 61. This releases the restriction on the displacement of the cutoff spring interlocking portion 20, releases the lock on the cutoff spring 11 in the charged state, and releases the cutoff spring 11. Accordingly, the main lever 22 rotates in the clockwise direction, and moves the movable contact 92 from the closing position to the cutoff position via the output rod 4. At this time, the piston 16 of the damper 14 of the cutoff spring portion 10 contacts the stopper 6a from below, generating the braking force of the damper 14, so that the movable contact 92 reaches the cutoff position while decelerating. As a result, the circuit breaker 90 is in the cutoff state shown in FIG. 4.

Next, the closing operation for shifting the circuit breaker 90 from the interrupted state to the closed state will be described. As shown in FIG. 4, when a closing command is issued from the circuit breaker 90 in the interrupted state of the circuit breaker 90, the closing electromagnetic solenoid 84 of the closing spring lock mechanism 80 is activated. The closing electromagnetic solenoid 84 protrudes the plunger 84a and rotates the closing restriction lever 82 in the counterclockwise direction while resisting the biasing force of the return spring 83. When the closing restriction lever 82 rotates in the counterclockwise direction, the outer peripheral surface 85a of the locking portion 85 slides against the claw 42a of the closing lever 42. When the claw 42a rides over the clockwise edge of the outer peripheral surface 85a of the locking portion 85, the closing lever 42 is released from the locking portion 85 and can be rotated in the counterclockwise direction. As a result, the restriction on the displacement of the closing spring interlocking portion 40 is released, and the lock of the energized closing spring 31 is released, and the closing spring 31 is released from the energized state. Accordingly, the second shaft 41 and the closing cam 44 rotate counterclockwise.

When the insertion cam 44 rotates counterclockwise, the cam surface 44a comes into contact with the roller 27a of the cam lever 27 in the counterclockwise direction centered on the central axis P. The cam lever 27 rotates the cam lever 27 in the clockwise direction so that the roller 27a moves away from the central axis Q, following the shape of the cam surface 44a, while causing the roller 27a to roll on the cam surface 44a of the insertion cam 44. Then, the sub-lever 25 and the latch lever 26 rotate in the clockwise direction together with the first shaft 24.

When the sub-lever 25 rotates clockwise, the main lever 22 is pressed counterclockwise via the main/sub connecting link 23. As a result, as shown in FIG. 5, the breaking spring receiver 12 is displaced downward via the breaking spring link 13, and the breaking spring 11 is charged.

When the latch lever 26 rotates clockwise, the roller 26a rotates the latch 63 of the locking lever 61 counterclockwise against the biasing force of the return spring 65, and overcomes the latch 63. As a result, the latch lever 26 comes into contact with the latch 63 from the clockwise direction about the central axis P, and the counterclockwise rotation is restricted. As a result, the closing spring 31 can be locked in the charged state as shown in Figure 5.

The following describes the charging operation of the closing spring 31. When the above-mentioned closing operation is completed, the charging mechanism 50 is driven to rotate the closing lever 42 in the counterclockwise direction. This causes the closing spring receiver 32 to be displaced downward via the closing link 43, so that the closing spring 31 is charged as shown in FIG. 2.

The following describes the condition monitoring system 100. The condition monitoring system 100 includes, for example, a displacement sensor 110, current sensors 120-1 to 120-3, a measurement value recording unit 130, and a condition monitoring device 150. The measurement value recording unit 130 may be an internal component of the condition monitoring device 150.

The displacement sensor 110 measures the displacement of the output rod 4 in the X direction and outputs the measurement result to the measurement value recording unit 130.

Current sensor 120-1 measures the current flowing through the electric motor 51 and outputs the measurement result to the measurement value recording unit 130. Current sensor 120-2 measures the current flowing through the closing electromagnetic solenoid 84 and outputs the measurement result to the measurement value recording unit 130. Current sensor 120-3 measures the current flowing through the breaking electromagnetic solenoid 74 and outputs the measurement result to the measurement value recording unit 130.

The measurement value recording unit 130 includes a storage device such as a RAM (Random Access Memory), flash memory, or HDD (Hard Disk Drive). The measurement value recording unit 130 records the measurement results (measurement value data) input from the displacement sensor 110 and each of the current sensors 120-1 to 120-3 in the storage device.

The condition monitoring device 150 includes, for example, a one-dimensional equivalent circuit network calculation unit 152, a condition judgment unit 154, an abnormality location identification unit 156, and a life estimation unit 158. These components are realized by, for example, a hardware processor such as a CPU (Central Processing Unit) executing a program (software). Some or all of these components may be realized by hardware (including circuitry) such as an LSI (Large Scale Integration), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a GPU (Graphics Processing Unit), or may be realized by cooperation between software and hardware. The program may be stored in advance in a storage device such as an HDD (Hard Disk Drive) or a flash memory (a storage device with a non-transient storage medium), or may be stored in a removable storage medium such as a DVD or CD-ROM (a non-transient storage medium), and may be installed in the storage device by mounting the storage medium in a drive device.

The one-dimensional equivalent circuit network calculation unit 152 calculates the calculated value data representing the state of the circuit breaker spring operating mechanism 2 by applying the measurement data to a one-dimensional equivalent circuit network model 200 (described later) of the circuit breaker spring operating mechanism 2 assumed in advance. The one-dimensional equivalent circuit network model 200 specifies the parameters and equations for each component, and the mutual interactions between the components, and can be created using model support software such as 1DCAE. The components include a rotating lever, a link, a spring, a damper, a motor, and an electromagnetic solenoid. For example, the spring is given a spring constant and a natural length as parameters, and the rotating lever is given parameters such as the position of the center of rotation, the position of each connection point, the moment of inertia, friction, a return spring, a stopper, and material properties. And, between components that affect each other, a mutual interaction relationship is specified in which the displacement amount of a specified location of one component affects the displacement amount of a specified location of the other component.

Figure 6 is a diagram showing an example of a one-dimensional equivalent circuit network model 200 of the circuit breaker spring operating mechanism 2 described in Figures 1 to 5. The reference numerals in the figure are the reference numerals in Figures 1 to 5 plus 200. For example, the component indicated by reference numeral 231 corresponds to the closing spring 31. Reference numeral 301 is a fixed component representing the fixed point of the spring, and reference numerals 302 to 308 are contact components representing the engagement relationship. The contact components indicated by reference numerals 302 to 308 are composed of flags representing that when the distance between the first side member and the second side member becomes zero, they engage and act on each other, and when the distance exceeds zero, they separate and no longer act on each other. The contact components have parameters that are set as the separation distance, contact friction, and restitution coefficient in a certain state, and therefore have parameters that are changed when estimating an abnormality location. The fixed components do not have parameters that are adjusted.

The link component 204 corresponding to the output rod 4 is restricted to only be movable in the axial direction and is connected to the link component 221 corresponding to the main link 21 in a freely rotatable manner.

The rotating lever component 222 corresponding to the main lever 22 has three connection points, which are freely rotatably connected to the link component 221, the link component 213 corresponding to the breaking spring link 13, and the link component 223 corresponding to the main/sub connecting link 23.

The link component 212 corresponding to the breaking spring bearing 12 has three connection points, two of which are rotatably connected to the spring component 211 and the link component 213, and the remaining point is connected to the contact component 302. One end of the spring component 211 is connected to the fixed component 301.

One end of the damper component 214 corresponding to the damper 14 is connected to the fixed component 301 and the other end is connected to the contact component 302.

The rotating lever component 225 corresponding to the sub-lever 25 has three connection points, one of which is freely rotatably connected to the link component 223, and the remaining two points are connected to the contact component 303 and the contact component 304, respectively.

The link component 263 corresponding to the latch 63 has two connection points, one of which is connected to the contact component 303 and the other of which is freely rotatably connected to the link component 261 corresponding to the locking lever 61.

The rotating lever component 272 corresponding to the blocking regulating lever 72 has two connection points, which are respectively connected to contact component 305 and contact component 306.

The link component 274a corresponding to the plunger 74a has two connection points, which are respectively connected to the contact component 306 and the electromagnetic solenoid component 274 corresponding to the cut-off electromagnetic solenoid 74.

The rotating lever component 241 corresponding to the second shaft 41 has three connection points, one of which is freely rotatably connected to the link component 243 corresponding to the closing link 43, and the remaining two points are connected to the contact component 304 and the contact component 307.

The rotating lever component 282 corresponding to the closing regulating lever 82 has two connection points, which are respectively connected to contact component 307 and contact component 308.

The link component 284a corresponding to the plunger 84a has two connection points, which are respectively connected to the contact component 308 and the electromagnetic solenoid component 284 corresponding to the closing electromagnetic solenoid 84.

The link component 232 corresponding to the closing spring receiver 32 has two connection points, which are rotatably connected to the link component 243 and the spring component 231 corresponding to the closing spring 31, respectively. The other end of the spring component 231 is connected to the fixed component 301.

The transmission unit component 253 corresponding to the transmission unit 53 is connected to the electric motor component 251 corresponding to the electric motor 51, and is connected to the rotation axis of the rotating lever component 241 corresponding to the second shaft 41 only during the charging operation.

For the one-dimensional equivalent circuit network model 200 configured in this way, the one-dimensional equivalent circuit network calculation unit 152 inputs, for example, current data from the measurement data, and causes the operation of the electric motor component 251, the electromagnetic solenoid component 274, and the electromagnetic solenoid component 284 caused by the current to act in a ripple manner on all components, and outputs the displacement amount of the link component 204 as calculated value data.

The one-dimensional equivalent circuit network calculation unit 152 uses predetermined normal state parameters to input the current data contained in the measurement data to the one-dimensional equivalent circuit network model 200 each time measurement data is recorded in the measurement recording unit 130 (there may be a time lag), thereby calculating the displacement of the link component 204 as normal state calculation value data.

The state determination unit 154 determines whether the state of any of the components of the circuit breaker spring operating mechanism 2 is abnormal based on the comparison result between the measurement value data and the normal calculation value data. Specifically, the state determination unit 154 compares the displacement amount of the link component 204 included in the measurement value data with the displacement amount of the link component 204 included in the normal calculation value data, and determines that the state of any of the components of the circuit breaker spring operating mechanism 2 is not abnormal if the difference is within a predetermined range (the absolute value of the difference is equal to or less than a threshold value), and determines that the state of any of the components of the circuit breaker spring operating mechanism 2 is abnormal if the difference is outside the predetermined range (the absolute value of the difference exceeds a threshold value). Note that instead of directly comparing the difference with a threshold value, other methods such as using various statistical values may be used.

Figure 7 is a diagram for explaining the processing performed by the state determination unit 154. In the figure, displacement S1 represents the displacement amount of the link component 204, current S2 represents the measurement value data measured by current sensor 120-1, current S3 represents the measurement value data measured by current sensor 120-2, and current S4 represents the measurement value data measured by current sensor 120-3. The solid line in the graph of displacement S1 represents the normal calculation value data, and the dashed line represents the displacement amount of the link component 204 included in the measurement value data. The other measurement value data remains unchanged. The deviation between the solid line and the dashed line in the graph of displacement S1 is recognized as a difference by the state determination unit 154. Note that Figure 7 shows various data during a disconnection operation.

When the state determination unit 154 determines that the state of any of the components of the circuit breaker spring operating mechanism 2 is abnormal, the abnormality location identification unit 156 repeatedly changes the parameters of the one-dimensional equivalent circuit network model 200 and causes the one-dimensional equivalent circuit network calculation unit 152 to calculate the displacement of the link component 204 using the current included in the measurement data as an input value until the difference between the displacement of the link component 204 included in the measurement data and the displacement of the link component 204 included in the calculated value data falls within a predetermined range. Then, the abnormality location identification unit 156 compares the parameters of the one-dimensional equivalent circuit network model 200 at the time when the difference falls within the predetermined range with the parameters in the normal state, and extracts parameters whose difference from the parameters in the normal state exceeds a specified range set for each parameter (an example of a difference greater than a standard). The abnormality location identification unit 156 identifies the part represented by the component corresponding to the extracted parameter as the abnormality location. Note that the range of values that can be taken by the parameters is specified according to the type of component, and the search range is limited thereby. The abnormality location identifying unit 156 may identify, as the abnormal location, a part represented by a component corresponding to a parameter having the largest value obtained by normalizing the difference from the parameter in the normal state according to the component. The abnormality location identifying unit 156 may not simply comprehensively search for parameters, but may search for parameters using an optimal value search method such as a genetic algorithm to avoid falling into a local solution. In this case, the abnormality location identifying unit 156 finds an optimal parameter sequence by performing processes such as crossover and mutation on a vector (gene) in which parameters are arranged.

The life estimation unit 158 tracks the change in the parameter to estimate how much time will pass before the component becomes abnormal. For example, the life estimation unit 158 causes the abnormality location identification unit 156 to change the parameter so that the difference between the measured value data and the calculated value data approaches. "So that the difference approaches" means, for example, that the difference falls within a narrower range than the "predetermined range" used by the state determination unit for determination. The life estimation unit 158 records the history of the changed parameters in a storage device, and identifies for each component the timing at which the parameter is expected to become different from the parameter in the normal state by more than a standard based on the history data of the changed parameters, and estimates the life of the component by assuming that the identified timing is the timing at which the component's life will end. For example, the life estimation unit 158 fits the change in the parameter over time with a straight line or a curve using the least squares method or the like, and identifies the timing at which the fitted straight line or curve reaches a value different from the parameter in the normal state by more than a standard as the above-mentioned timing.

As described above, according to this embodiment, abnormalities in the spring operating mechanism 2 can be automatically detected and the abnormal location can be identified. As a result, repairing the spring operating mechanism 2 requires only partial part replacement. This reduces the labor required for repairing the spring operating mechanism 2 and shortens the downtime of the circuit breaker 90.

In addition, one-dimensional equivalent circuit analysis is a method of modeling the entire system by setting each part as a component containing various parameters and equations, and connecting the components together. Therefore, it is easy to create models even for operating mechanisms with different structures, and it is easy to accommodate various operating mechanisms.

In addition, since the analysis time for one condition in one-dimensional equivalent circuit network analysis is extremely short, abnormalities can be identified in a short time even when multiple analyses are repeated.

In addition, in this embodiment, the lifespan estimation unit 158 also enables lifespan diagnosis of each part of the spring operating mechanism 2, making it possible to plan and prioritize part replacement in accordance with the equipment condition.

In addition, the state judgment unit 154, one-dimensional equivalent circuit network calculation unit 152, abnormality location identification unit 156, and life estimation unit 158 are rewritable, and can be changed to functions suited to operation.

In addition, since there are many parameters in the one-dimensional equivalent circuit network model 200, it may take a long time for the anomaly location identification unit 156 to calculate all combinations and identify the anomaly location. Therefore, by equipping the anomaly location identification unit 156 with a calculation means that uses an optimal value search method that derives an optimal solution that minimizes the difference between the calculated value data and the measured value data, it becomes possible to identify the anomaly location in a short time.

Figure 8 is a diagram showing a circuit breaker and a circuit breaker spring operating device according to a first modified example of the embodiment. Note that in this modified example, the same components as those in the above embodiment are given the same reference numerals and redundant explanations are omitted.

As shown in Fig. 8, in the first modified example, the condition monitoring system 100A further includes a temperature sensor 140. The temperature sensor 140 is disposed in a housing of the spring operating mechanism 2. The temperature sensor 140 measures the ambient temperature of the spring operating mechanism 2. The temperature sensor 140 indirectly measures the temperatures of the cut-off electromagnetic solenoid 74, the closing electromagnetic solenoid 84, the electric motor 51, the damper 14, and the connecting parts and sliding parts of each component in the spring operating mechanism 2. The temperature sensor 140 outputs the measurement results to the measurement value recording unit 130. The measurement value recording unit 130 records the measurement results (measurement value data) input from the temperature sensor 140 in a storage device.
Therefore, according to this modification, highly accurate calculations are possible by reflecting the measurement results of the temperature sensor 140 in the one-dimensional equivalent circuit network model 200. Thus, a condition monitoring system 100A with even higher accuracy can be provided.

Figure 9 is a diagram showing a circuit breaker and a circuit breaker spring operating device according to a second modified example of the embodiment. Note that in this modified example, the same components as those in the first modified example are given the same reference numerals and redundant explanations are omitted.

As shown in FIG. 9, in the second modified example, the measurement results output from the sensors that measure the various parts of the plurality of spring operating mechanisms 2 are collected in a single measurement value recording unit 130 .
Therefore, according to this modification, a single abnormality location identifying unit 156 can monitor the status of the spring operating mechanisms 2 in the entire substation or in multiple substations.

The spring operating mechanism combined with the condition monitoring system 100, 100A is not limited to the configuration of the above embodiment.

In the above embodiment and its modified examples, the condition monitoring system 100 uses the displacement sensor 110, the current sensors 120-1 to 120-3, and the temperature sensor 140, but is not limited to this configuration. The condition monitoring system can also record the measurement results of sensors other than the displacement sensor, current sensor, and temperature sensor (such as a load sensor or acceleration sensor), thereby enabling more accurate identification of abnormalities and lifespan diagnosis.

In addition, in the above embodiment, an example of processing during the cut-off operation is shown in Figure 7, but the same is possible for monitoring the closing operation and the charging operation of the closing spring.

According to at least one of the embodiments described above, there is provided a state determination unit which determines whether the state of any of the components of the spring operating mechanism is abnormal based on the comparison result between the measurement data and normal state calculation value data calculated by the one-dimensional equivalent circuit network calculation unit using normal state parameters, and an abnormality location identification unit which, when the state determination unit determines that the state of any of the components is abnormal, changes the parameters so that the difference between the measurement data and the calculation value data is within a preset range, and identifies, at the time the parameters are changed, the component associated with parameters that differ by more than a standard compared to the normal state parameters as being the abnormal location, thereby making it possible to automatically detect abnormalities in the spring operating mechanism and identify the abnormal location.

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are within the scope of the invention and its equivalents as set forth in the claims, as well as the scope and spirit of the invention.

Claims (5)

A state monitoring system for a spring operating mechanism for a circuit breaker that reciprocates a movable contact of the circuit breaker to transition the circuit breaker between an open state and an open state, comprising:
The spring operating mechanism includes:
an output rod connected to the movable contact;
a breaker spring that is locked in a charged state in the closed state and that is released when the circuit breaker is transitioned from the closed state to the interrupted state;
a closing spring that is locked in a charged state in the interrupted state and is released and charges the interrupting spring when the circuit breaker is shifted from the interrupted state to the closed state;
An electric motor that energizes the closing spring;
a cutoff electromagnetic solenoid that unlocks the cutoff spring that is in a charged state in the closed state;
a closing electromagnetic solenoid that unlocks the closing spring that is in a charged state in the disconnected state;
Equipped with
a displacement sensor for measuring a displacement of the output rod;
current sensors for measuring currents flowing through the cut-off electromagnetic solenoid, the make-on electromagnetic solenoid, and the electric motor;
a measurement value recording unit that records the measurement results of the displacement sensor and the current sensor in a storage device as measurement value data;
a one-dimensional equivalent circuit network calculation unit that calculates calculated value data representing a state of the spring operating mechanism by applying the measurement data to a one-dimensional equivalent circuit network model of the spring operating mechanism, the one-dimensional equivalent circuit network model defining parameters for each component and mutual interactions between the components;
a state determination unit that determines whether or not a state of any component of the spring operating mechanism is abnormal based on a comparison result between the measurement value data and normal-state calculated value data calculated by the one-dimensional equivalent circuit network calculation unit using normal-state parameters;
an abnormality location identifying unit that, when the state determining unit determines that the state of any of the components is abnormal, changes the parameters so that a difference between the measurement value data and the calculation value data falls within a preset range, and identifies, at the time when the parameters are changed, a component associated with a parameter that is different from the parameter in the normal state by an amount equal to or greater than a reference value as an abnormal location;
A condition monitoring system for a spring operating mechanism for a circuit breaker comprising: the abnormality location identifying unit changes the parameters so that the difference between the measurement value data and the calculation value data approaches even when the state determining unit determines that the state of any of the components is not abnormal;
a life estimation unit that identifies, for each component, a timing at which the parameter is expected to become different from the parameter in the normal state by a standard or more based on history data of the changed parameter, and estimates a life of the component based on the timing;
The state monitoring system for a spring operating mechanism for a circuit breaker according to claim 1. A temperature sensor for measuring an ambient temperature of the spring operating mechanism is further provided.
The one-dimensional equivalent circuit network calculation unit calculates the calculated value data by further inputting the ambient temperature into the one-dimensional equivalent circuit network model.
3. A state monitoring system for a spring operating mechanism for a circuit breaker according to claim 1. The anomaly location identifying unit includes a calculation means using an optimal value search method.
The state monitoring system for a spring operating mechanism for a circuit breaker according to any one of claims 1 to 3. A monitoring method for a spring operating mechanism for a circuit breaker, in which a status monitoring system reciprocates a movable contact of the circuit breaker to transition the circuit breaker between an open state and an open state, comprising the steps of:
The spring operating mechanism includes:
an output rod connected to the movable contact;
a breaker spring that is locked in a charged state in the closed state and that is released when the circuit breaker is transitioned from the closed state to the interrupted state;
a closing spring that is locked in a charged state in the interrupted state and is released and charges the interrupting spring when the circuit breaker is shifted from the interrupted state to the closed state;
An electric motor that energizes the closing spring;
a cutoff electromagnetic solenoid that unlocks the cutoff spring that is in a charged state in the closed state;
a closing electromagnetic solenoid that unlocks the closing spring that is in a charged state in the disconnected state;
Equipped with
a first measuring step of measuring a displacement of the output rod;
a second measurement step of measuring currents flowing through the cut-off electromagnetic solenoid, the make-on electromagnetic solenoid, and the electric motor;
a measurement value recording step of recording the measured displacement of the output rod and the measured current as measurement value data in a storage device;
a one-dimensional equivalent circuit network calculation step of calculating calculated value data representing a state of the spring operating mechanism by applying the measurement data to a one-dimensional equivalent circuit network model of the spring operating mechanism, the one-dimensional equivalent circuit network model defining parameters for each component and mutual interactions between the components;
a state determination step of determining whether or not a state of any component of the spring operating mechanism is abnormal based on a comparison result between the measurement data and normal-state calculated value data calculated using normal-state parameters in the one-dimensional equivalent circuit network calculation step;
an abnormality location identification step of, when it is determined in the state determination step that the state of any of the components is abnormal, changing the parameters so that a difference between the measurement value data and the calculation value data satisfies a condition within a preset range, and identifying, at the time when the parameters are changed, a component associated with a parameter that is different from the parameter in the normal state by a standard or more as an abnormal location;
A method for monitoring a spring operating mechanism for a circuit breaker comprising the steps of:

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