JP2007287651A - Operation device for gas-insulated switchgear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation device for a gas-insulated switchgear (C) equipped with a current blocking device or an electric circuit input device constituted of a fixed contact and a movable contact (A), which is provided in a grounded container with insulation gas injected inside, drives the movable contact (A) to a blocking direction or an input direction, reduced in energy loss to be accumulated and capable of arbitrary continuous operation of input and blocking. <P>SOLUTION: An blocking operation is carried out by a spring operation device (100), an input operation is carried out by a separately independent oil pressure operation device (200). Operation ends of the spring operation device (100) and the oil pressure operation device (200) are coupled through a connection link (300) and a lever (12), and driving energy by the oil pressure operation device can be accumulated at a spring (10) of the spring operation device (100). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a gas-insulated switchgear constituted by a stationary contact and a movable contact that contacts the stationary contact, for interrupting current and charging an electric circuit. In particular, the present invention relates to an operating device for a gas insulated switchgear in which a mechanism for driving a movable contact is constituted by a hydraulic operating means and a spring operating means.

  Normally, a gas-insulated switchgear has a fixed contact and a movable contact that contact a circuit for energizing current because it is necessary to energize and shut off the current. An electric cut-off signal is given to an operating device for driving the child. Similarly, in order to turn on the circuit electrically, a signal command is given to the operating device.

  At present, as a driving source of an operating device for driving a movable contact of a gas insulation device, a hydraulic operating device using an oil accumulator using a compressible gas as a driving source and a compressive gas directly under pressure An air operating device that accumulates in a container and serves as a driving source, and a spring operating device that uses a coil spring or a disc spring as a driving source are mainly used.

  As described above, the hydraulic actuator uses an accumulator that uses a compressible gas as a device for accumulating drive energy, and energy is supplied to the hydraulic actuator only by this accumulator. Similarly, in the air operating machine, a high-pressure air tank is used as a device for storing drive energy, and the energy of the air operating device is supplied only by the high-pressure tank.

  On the other hand, as a gas-insulated switchgear in which an air operating device is partially applied, there is a case where a design using a compression spring force is used for the closing operation, but a design using a spring operation for the blocking operation is not seen.

  The operation principles of the hydraulically operated and pneumatically operated drive devices referred to above are quite similar, and an example of the configuration will be described as follows.

  That is, among the pistons having different pressure receiving areas, a closing operation is performed by constantly applying a high pressure to one piston and switching the pressure in the other piston to a high pressure. Further, the shut-off operation is performed by switching the pressure acting on one of the pistons to a low pressure in the driving device in the input state.

  A feature of the hydraulic and pneumatic actuators is that by increasing the diameter of the piston, greater operating energy can be realized relatively easily when compared to a spring actuator.

  In the spring operating device, since the blocking spring force and the closing spring force have a mutual relationship, it is impossible to change only one of the spring forces. In addition, a structure that interlocks the mechanical spring force for closing and the spring force for closing by a cam mechanism is common, but due to the mechanical strength of the connecting parts, large operation like a hydraulic actuator or an air operating device is required. It is impossible to realize power.

  In addition to the above-described features, the hydraulic operating device and the air operating device include an accumulator or a high-pressure air tank as an energy storage device and supply energy to the operating device by the energy storage device. Therefore, this operation device can easily increase the number of possible continuous operations of the gas insulating device by simply increasing the size of the storage device.

  In general, a gas insulated switchgear to which the above-described hydraulic and air operating devices are applied is a continuous operation function according to conditions without additional supply of energy by a hydraulic pump compressor, etc. There is a case where a function of continuously performing the closing operation → the blocking operation or the closing operation → the blocking operation three or more times is also required.

  In addition, since the energy storage device uses gas, energy (hydraulic pressure accumulated in the accumulator) decreases due to the operation of the gas insulated switchgear because the energy storage device uses gas. .

  The gas-insulated switchgear operating device (for example, a hydraulic operating device) has a normal pressure change range (31.5-33.5 MPa), a high-speed reclosing operation lock (lock ) Pressure (pressure to lock the operation to perform continuous shut-in-shut-off: 30.0 MPa), lock-in operation lock pressure (27.0 MPa), and shut-off operation lock pressure (25.5 MPa) are defined by standards Has been.

  Therefore, the breaking current performance of the device needs to guarantee the lock pressure of each operation (breaking lock is 25.5 MPa). Further, since the mechanical strength design needs to be performed with the maximum value (33.5 MPa) in the normal pressure range, a very economical design is impossible.

  As a result, the cost of the equipment is high, and at the same time, compact design is difficult. In addition, the pressure is fluctuated by the change in ambient temperature by using gas. That is, since the driving force during operation greatly changes from the condition of opening operation lock pressure to the condition of maximum pressure, the accumulated energy is reduced due to leakage of oil or compressed air. For this reason, it is necessary to periodically replenish energy with a hydraulic pump compressor or the like, thereby requiring auxiliary equipment such as a pressure monitoring device and a safety device, which also affects the cost of the equipment.

  Unlike the above-described hydraulic operation device and air operation device, the spring operation device has a structure composed of two types of springs, namely, a cutoff operation spring and a cutoff spring compression operation and closing spring.

  All spring actuators that are currently commercialized have a mechanism that compresses the shut-off spring at the same time as performing the closing operation of the gas insulated switchgear by releasing the driving energy of the closing spring.

  In addition, due to the mechanism of the spring actuator, the gas-insulated switchgear can only perform a continuous operation of shut-off operation-> close-up operation-> shut-off operation, and accumulates its potential energy in the close-up spring after completing this continuous operation. The time of about 10 to 15 seconds is required.

  Only a continuous operation of shut-off → loading → shut-off can be performed, which is a great disadvantage of the spring operating device as compared with the hydraulic operating device and the air operating device. In particular, there are many cases where a customer's request is not satisfied for a device having a transmission voltage of 300 kV or higher.

  In the spring operating device, since the driving energy is maintained as mechanical energy by the compressive force of the spring, the fact that the value does not change with time as in the case of a hydraulic operating device or an air operating device acts as a great advantage. At the same time, since the operation is performed by the compression energy of the spring force, the gas insulated switchgear is driven by normal energy. This is also the most different point when compared with hydraulic and pneumatic actuators where the operating energy can change.

As means for solving the above problems, Japanese Patent Application Laid-Open No. 5-298968 discloses a hydraulic operating device in which a disc spring is applied to an oil accumulator. Since this accumulator is commonly used for shut-off, the capacity of the accumulator is significantly larger than that when the present invention is applied when compared with a hydraulic actuator having the same operating energy. Basically, it replaces the accumulator using compressed gas, which is used in conventional hydraulic actuators, and solves the technical problems of conventional hydraulic actuators only by applying disc springs. I couldn't.
JP-A-5-298968 JP2003-36769A JP-A-6-196407

  Therefore, by collecting the advantages of the hydraulic operating device, air operating device and spring operating device which are mainly used as the operating device for driving the contact of the current gas insulated switchgear, the above problems can be solved. An object of the present invention is to provide an operating device for a gas-insulated switchgear constituted by hydraulic operating means and spring operating means for driving a movable contact.

  In order to achieve the above object, the present invention provides a gas insulated switchgear comprising a current interrupt device or an electric circuit input device composed of a stationary contact and a movable contact provided in a grounded container into which an insulating gas has been injected. A device is characterized in that a shut-off operation is performed by a spring operating device and a closing operation is performed by a hydraulic operating device with respect to an operating device for driving the movable contact in a shut-off direction or a closing direction. .

  The present invention also provides a gas insulation comprising a current contact device or an electric circuit charging device comprising a fixed contact installed in a grounded container into which an insulating gas is injected and a movable contact contacting the fixed contact. A device is characterized in that a spring operation device for driving the movable contact member in a shut-off direction and a hydraulic operation device for driving the movable contact member in a closing direction are separated and independent from each other.

  Furthermore, a coil spring or a disc spring is applied as a driving source of the spring operating device, and an accumulator using compressible gas energy is used as a driving source of the hydraulic operating device, or a coil spring or a disc is used as the driving source of the shut-off operating device. An accumulator having a spring is used.

  According to the present invention, the gas-insulated switchgear has an unreasonable design to ensure the performance under the circuit locking pressure condition and the mechanical performance under the highest pressure condition, which has been a problem of the conventional pneumatic actuator. The necessary cause is solved, and at the same time, the influence of the shut-off operation characteristic due to the ambient temperature change can be completely eliminated. If a hydraulic actuator is used for the closing operation, it is possible to solve the problem of mechanical strength, which is a problem with the conventional spring actuator. Further, the number of continuous operations can be easily dealt with by changing the capacity of the accumulator.

  If the spring-type operating device for shut-off and the hydraulic operating device for making-up are configured independently and these operating devices or units are mechanically interlocked, the degree of freedom in design with respect to the arrangement and mounting direction of the operating devices. Is extremely high, and a compact design is possible. Therefore, the gas insulated switchgear of the present invention has an effect that it is very economical due to downsizing and rationalization of the equipment.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  In the following description, a representative embodiment of the present invention for realizing the above technical problem is presented.

  In the present invention, the shut-off operation is performed by a spring-type operating device by the movable contact of the gas-insulated switchgear, and the closing operation is performed by a hydraulic-type operating device. The hydraulic device has a structure capable of storing drive energy by compressing the cutoff spring of the spring operating device during the closing operation.

  In addition, the spring type operating device and the hydraulic type operating device of the present invention are configured independently of each other, and are configured to mechanically move both operating devices by a connection link, a lever and the like according to the arrangement of the devices. When the hydraulic operation device completes the closing operation, at the same time, the accumulation of the drive energy of the shut-off spring type operation device is completed, and at this time, the high-pressure hydraulic oil that is the driving source of the hydraulic operation device is automatically reduced to the lower pressure side. Including a system that opens up to the space.

  On the other hand, if the device of the present invention is applied to a gas-insulated switchgear, the problem relating to the operation lock pressure in the gas-insulated switchgear to which the conventional hydraulic device and the air operating device are applied is solved, and the current interruption characteristics due to the operation lock pressure Can be secured. At the same time, constant operating energy can always be realized by the operating device for the shut-off operation without causing the problem of ensuring the mechanical performance due to the maximum pressure condition. Moreover, the gas insulated switchgear according to the present invention can be rationally solved by applying a spring-type operating device capable of accumulating as compression spring energy.

  Furthermore, the device of the present invention can completely eliminate the influence of the shut-off operation characteristics due to changes in the ambient temperature, and by applying a hydraulically operated device to the closing operation, the machine due to an increase in operating force in the conventional spring operating device It is possible to solve the problem of mechanical strength. For the number of continuous operations, the capacity of the accumulator of the input hydraulic operating device can be increased / decreased according to the customer's specifications, so that it can be carried out without significant changes to the equipment. It is. It is possible to configure the cutoff spring operating device and the closing hydraulic operating device to be completely independent, and to mechanically interlock both operating devices by using links and levers. If it is like this, it can design freely also with respect to the arrangement | positioning direction and position of an operating device, and a gas insulated switchgear can implement | achieve rational and economical design simultaneously with size reduction of an apparatus.

<Specific Embodiment>
FIG. 1 shows a state in which the operation device for a gas insulated switchgear according to a preferred embodiment of the present invention is completely charged. The operating device according to the present invention includes a spring-type operating device unit 100 that performs a shut-off operation, and a hydraulic operating device unit 200 that performs a closing operation while compressing the shut-off spring 10 of the spring-type operating device unit 100 during the closing operation. The The operation device units 100 and 200 are connected to each other through a connection link 300. In the illustrated example, the operation end portions of these operation device units 100 and 200 are connected to each other through a main conversion lever 12 in the spring-type operation device unit 100 and pivotally supported at the center, and a connection link 300. ing. That is, one arm end of the main conversion lever 12 is connected to the operation end (the free end of the rod 14) of the spring-type operating device unit 100 via the hinge 16, and the other arm end of the main conversion lever 12 is It is connected to the operating end of the hydraulic operating device unit 200 (the free end of the operating piston 36) via a straight connection link 300 and two hinges.

  Further, the movable contact A of the gas insulated switchgear C is connected to the main conversion lever 12 in the spring-type operating device unit 100 by a link B. In the illustrated example, the link B connected to the movable contact A is connected to the hinge 16 of the main conversion lever 12.

  The spring-type operating device unit 100 transmits the force of the cutoff spring 10 that has accumulated energy for the cutoff operation to the main conversion lever 12 by the cutoff spring rod 14 and the hinge 16. The main conversion lever 12 is in contact with the three-stage lever 20 with the roller lever 18 of the main conversion lever, and maintains the rotational force. The three-stage lever 20 generates a clockwise rotational force by the operation with the main conversion lever 12. Therefore, it is designed by moving the load direction from the main conversion lever 12 and the rotation center axis of the three-stage lever 20 by necessary dimensions.

  Based on the principle described above, the generated rotational force of the three-stage lever 20 is maintained by the two-stage lever 22. Similarly to the mutual contact relationship between the main conversion lever 12 and the third-stage lever 20, a clockwise rotational force acts on the second-stage lever 22 by the mutual contact between the third-stage lever 20 and the second-stage lever 22. The rotational force of the second lever 22 is maintained by mutual contact with the first lever 24. Since the rotation axis of the first-stage lever 24 is designed to be a mutual contact position of the second-stage lever 22 and a dead point, the first-stage lever 24 has a design in which no rotational force acts. At this time, the first stage lever 24 is connected to the solenoid lever 26 by the link 28 with the rotating shaft fitted. The above-described levers 20, 22, and 24 are provided with reset springs 30, 32, and 34, respectively, to apply a counterclockwise rotational force to the levers 20, 22, and 24.

  The operating piston 36 of the hydraulic operating device unit 200 that performs the closing operation is connected to the main conversion lever 12 by fitting the connecting link 300. At this time, the oil pressure does not act on the operation piston 36 in the fully charged state.

  The hydraulic operating device unit 200 includes a switching valve 42 for supplying high pressure oil from the accumulator 38 to the operating piston control chamber 40 in order to hydraulically drive the operating piston 36 during the closing operation, and a switching valve control chamber 44. And a charging solenoid 48 for driving a charging pilot valve 46 for supplying high-pressure oil to the tank.

  Further, in the central portion of the switching valve 42, a conduit 52 for supplying high-pressure oil to the switching valve control chamber 44 and the pressure of the switching valve control chamber 44 are maintained to hydraulically position the switching valve 42. An orifice 54 is provided for maintenance. A hydraulic pump 56 for generating high-pressure oil and supplying it to the accumulator 38 is designed, and includes a safety valve, a stop valve, and a filter valve.

  The gas insulated switchgear C performs a shut-off operation from the state shown in FIG. This shut-off operation is performed by giving an electrical shut-off signal to the gas insulated switchgear C or by manual operation.

  When the manual operation button is pressed, the solenoid lever 26 rotates. When the same electrical operation is performed, a current flows through the shut-off solenoid 58 and the solenoid is driven to rotate the solenoid lever 26 clockwise. At this time, the first-stage lever 24 connected to the solenoid lever 26 by inserting the rotary shaft also rotates in the clockwise direction, and the connection with the second-stage lever 22 is released. Therefore, the second lever 22 is rotated clockwise by the rotational force acting on the second lever 22, and the connection between the second lever 22 and the third lever 20 is released.

  In this way, by releasing the connection between the three-stage lever 20 and the main conversion lever 12, the locking action that has left the blocking spring 10 compressed is released. As a result, the main conversion lever 12 rotates in the clockwise direction, and the movable contact A is driven in the blocking direction. Due to the rotational movement of the main conversion lever 12, the operation piston 36 mechanically connected through the connection link 300 performs a protruding operation toward the left side.

  FIG. 2 shows a state in which the shut-off operation of the operating device for gas insulated switchgear according to the present invention is being performed.

  The low-pressure hydraulic oil in the operation piston control chamber 40 passes through the switching C port 62 from the switching B port 60 and is discharged into the hydraulic pump case 64. The hydraulic oil in the hydraulic pump case 64 flows into the operation piston low pressure chamber 66. Further, in order to perform the braking operation of the gas switching device at the end of the shut-off operation, a shut-off cushion device portion 68 is installed on the operation piston 36. After reaching the stroke end controlled by the cushion device portion 68, the blocking spring stop bar 70 supports the blocking spring force and simultaneously locks the blocking position.

  FIG. 3 shows a state where the shut-off operation is completed in the operating device for a gas insulated switchgear according to the present invention. The input operation of the present invention will be described below.

  The gas insulated switchgear C performs the closing operation from the shut-off state of FIG. As in the case of the shut-off operation, the closing operation is performed by giving an electrical closing signal to the gas insulated switchgear C, or is performed manually.

  When the manual operation button is pressed, the closing pilot valve 46 is opened. In the case of operating by electric force, a current is passed through the closing solenoid 48 to drive the solenoid, thereby opening the closing pilot valve 46. When the injection pilot valve 46 is opened, high-pressure oil is supplied to the switching valve control chamber 44, and the switching valve 42 is switched in the left direction.

  As a result, the switching A port 72 and the switching B port 60 are connected to each other, and the high pressure oil from the accumulator 38 is supplied to the operation piston control chamber 40. At this time, the pressure release check valve 74 is opened via the switching valve control chamber 44 and the pipeline, and the high pressure oil is not released.

  By supplying high-pressure oil to the operation piston control chamber 40, the operation piston 36 is driven in the right direction. The main conversion lever 12 connected to the connection link 300 rotates counterclockwise, whereby the blocking spring 10 is compressed. By installing the input variable choke 76 between the accumulator 38 and the switching A port 72, the speed of the operation piston 36 can be adjusted. During the charging operation, high pressure oil is supplied from an orifice 54 installed inside the switching valve 42 by maintaining the high pressure oil in the switching valve control chamber 44.

  FIG. 4A shows a state during the closing operation of the operating device for the gas insulated switchgear according to the present invention.

  When the closing operation reaches the final stage, the operation piston 36 collides with the pressure release check piston 78. At this time, the pressure release check piston 78 opens the pressure release check valve 74 and discharges the high pressure oil in the switching valve control chamber 44 to the switching C port 62.

  The main conversion lever 12 connected to the operation piston 36 through the connection link 300 is rotated to an overstroke position at the time when the operation piston 36 and the pressure release check piston 78 come into a positional relationship where they collide. The The overstroke cuts off the main conversion lever 12 to perform the operation of reconnecting the main conversion lever 12, the third step lever 20, the second step lever 22, and the first step lever 24 of the spring-type operating device unit 100. This is an operation of slightly rotating counterclockwise from the connection position in the state, and a predetermined gap a is secured at the contact portion between the roller lever 18 and the three-stage lever 20. At this time, the length of time or the time range during which the overstroke is performed can be adjusted by adjusting the characteristics of the throwing cushion device 80, thus ensuring the time required to reconnect the lever. Is possible. Further, if the characteristics of the closing cushion device 80 are made variable, it is possible to easily cope with other charging operation characteristics depending on the type of the gas insulated switchgear C.

  FIG. 4B shows a state when the closing operation of the operation device for gas insulated switchgear according to the present invention has reached the final stage.

  Simultaneously with the overstroke operation, the pressure release check valve 74 is opened, and the high pressure oil in the switching valve control chamber 44 is discharged to the switching C port 62. Therefore, when the switching valve 42 is operated in the right direction so that the switching B port 60 and the switching C port 62 communicate with each other, the high pressure oil in the operation piston control chamber 40 is discharged to the hydraulic pump case 64, As a result, the operation piston 36 loses the hydraulic driving force. At this time, the main conversion lever 12 in the overstroke state rotates clockwise by the force of the cutoff spring 10 to the position where it is connected to the three-stage lever 20. At the same time, the operation piston 36 connected to the connection link 300 is also moved leftward by a distance corresponding to the gap a to complete the closing operation.

  Next, a response when an abnormal operation occurs in the operating device according to the present invention will be described.

  The abnormal operation that causes a problem in the gas-insulated switchgear C occurs for some reason after the closing operation. In order to perform an abnormal operation, the pilot valve for injection 46 must not be completely closed, and high-pressure oil must be continuously supplied to the switching valve control chamber 44.

  As described above, when an abnormal operation occurs, the pressure release check valve 74 installed at a position communicating with the switching valve control chamber 44 via a pipe line is pressed by the operation piston 36. Therefore, it is not completely closed. Therefore, even when the closing pilot valve 46 is not completely closed due to an abnormal phenomenon, the pressure in the switching valve control chamber 44 can be maintained at a low pressure. Therefore, the abnormal phenomenon can be confirmed by increasing the number of pump operations.

  FIG. 5 shows a state when an abnormal condition occurs after the closing operation in the operating device for gas insulated switchgear according to the present invention.

  As described above, the specific embodiments have been described in the detailed description of the present invention. However, it is apparent to those skilled in the art that various changes in form and details are possible. . Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined based on the description of the scope of claims and equivalents thereof.

It is a figure which shows the state which injection | throwing-in was completed about the operating device for gas insulated switchgear by preferable embodiment of this invention. It is a figure which shows the state in which interruption | blocking operation is progressing about the operating device of FIG. It is a figure which shows the state when the interruption | blocking operation is completed about the operating device of FIG. It is a figure which shows the state in which injection | throwing-in operation is progressing about the operating device shown in FIG. It is a figure which shows the state at the time of closing operation | movement reaching the final stage about the operating device shown in FIG. FIG. 2 is a diagram showing a state when an abnormal condition occurs after a closing operation in the operating device shown in FIG. 1.

Explanation of symbols

10 Interrupting spring 12 Main conversion lever 14 Interrupting spring load
18 Roller lever 20 3 step lever 22 2 step lever
24 1st lever 26 Solenoid lever
30, 32, 34 Reset spring 36 Operating piston
38 Accumulator 40 Operating piston control chamber 42 Switching valve 44 Switching valve control chamber 46 Pilot valve for charging
48 Solenoid for closing 50 Reset spring 54 Orifice
56 Hydraulic pump 58 Solenoid for shutoff
60 B port for switching 62 C port for switching 64 Hydraulic pump case
66 Operation piston low pressure chamber 68 Cushion device part for shutoff 70 Shutoff spring stopper 72 A port for switching
74 Pressure Release Check Valve 76 Input Variable Choke 78 Pressure Release Check Piston 80 Input Cushion Device 100 Spring Actuator Unit 200 Hydraulic Actuator Unit 300 Link for Connection

Claims (6)

A current interrupting device or an electric circuit input comprising a fixed contact (A) and a movable contact (A) that is detachably contacted with the fixed contact provided in a grounded container into which an insulating gas has been injected. An operation device for driving the movable contact (A) in a shut-off direction or a closing direction for a gas insulated switchgear (C) provided with a device,
A shut-off operation for driving the movable contact (A) in the shut-off direction is performed by the spring operating device (100), and a closing operation for driving the movable contact (A) in the closing direction is performed by the hydraulic operating device (200). An operating device for a gas insulated switchgear characterized by performing. A current interrupting device or an electric circuit input comprising a fixed contact (A) and a movable contact (A) that is detachably contacted with the fixed contact provided in a grounded container into which an insulating gas has been injected. An operation device for driving the movable contact (A) in a shut-off direction or a closing direction for a gas insulated switchgear (C) provided with a device,
A closing operation for driving the movable contact in the closing direction is performed by a spring operating device (100), and a blocking operation for driving the movable contact in a blocking direction is performed by a hydraulic operating device (200). Operation device for gas insulated switchgear.   The operating device for a gas insulated switchgear according to claim 1 or 2, wherein the spring operating device (100) and the hydraulic operating device (200) are configured separately from each other.   The operating end of the spring operating device (100) and the operating end of the hydraulic operating device (200) are connected to each other through a connection link (300) and a lever (12), and the hydraulic operating device (200) is driven. The operating device for a gas-insulated switchgear according to claim 3, wherein the driving energy is stored in the spring (10) of the spring operating device (100) when the operation is performed.   When the closing operation by the closing hydraulic operating device (200) is completed and the accumulation of the driving energy in the interrupting spring operating device (100) is completed at the same time, the hydraulic operating device (200) is automatically driven. 5. The gas insulation according to claim 4, further comprising a mechanism for losing the driving force generated by the hydraulic operating device (200) by opening the high-pressure hydraulic oil in the piston on the side to the space on the low-pressure side. Operating device for switchgear.   2. An accumulator using compressible gas energy is used as a driving source of the hydraulic operating device, and / or an accumulator having a coil spring or a disc spring is used as a driving source of the spring operating device. The operation apparatus for gas insulated switchgears in any one of -5.

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