KR100770099B1 - Control apparatus for gas insulated switchgear - Google Patents

Abstract

The present invention is to collect the advantages of each of the manipulators of the hydraulic manipulator, air manipulator, spring manipulator which is used mainly as a manipulator for driving the contactor of the gas insulated switchgear can solve the disadvantages of the three kinds of manipulators described above. To implement a control device for a gas insulated switchgear.

Gas, Insulation, Manipulator, Valve, Spring, Lever, Accumulator.

Description

Control device for gas insulated switchgear {CONTROL APPARATUS FOR GAS INSULATED SWITCHGEAR}

1 is a view showing a fully inserted state of the operation device for gas insulated switchgear according to an embodiment of the present invention.

FIG. 2 is a view showing the middle of a blocking operation of the operation device shown in FIG. 1; FIG.

Figure 3 is a view showing a blocking state of the operation device shown in FIG.

4A and 4B are views showing the feeding operation of the operating device shown in FIG. 1.

Fig. 5 is a view showing the operation of the manipulator when an abnormal condition occurs after the closing operation shown in Fig. 1;

<Description of the symbols for the main parts of the drawings>

10: blocking spring 12: peripheral ring lever

14: blocking spring rod 18: roller lever

20: three-speed lever 22: two-speed lever

24: 1-speed lever 26: Solenoid lever

30, 32, 34: Reset spring 36: Operation piston

38: Accumulator 40: Operation piston control room

42: switching valve 44: switching valve control room

46: pilot valve for injection 48: solenoid for injection

50: reset spring 54: orifice

56: hydraulic pump 58: shutoff solenoid

60: Switching B port 62: Switching C port

64: hydraulic pump case 66: operation piston low pressure chamber

68: cushioning section for blocking 70: blocking spring stop bar

72: A port for switching 74: Pressure release check valve

76: variable input choke 78: pressure-opening check piston

80: input cushion device 100: spring operation unit

200: hydraulic control unit

300: link for connection

The present invention relates to a gas insulated switchgear configured from a fixed contactor for current interruption and electrical circuit input, and a movable contact contacting the fixed contactor, and more particularly, comprising a hydraulic operation means and a spring operation means. The present invention relates to a gas insulated switchgear for driving a ruler.

Typically, a gas insulated switchgear has a fixed contactor and a movable contactor for contacting a circuit for current conduction because the gas insulated switchgear must be energized and interrupted, and when the circuit is disconnected, an electrical disconnect signal is provided to an actuator driving the movable contactor. It is. In addition, in order to electrically input the circuit, it is operated by giving a signal command to the manipulator.

Currently, a hydraulic manipulator driven by an oil accumulator using a compressible gas as a driving source for driving a movable contactor of a gas insulator, and an air manipulator and coil spring which accumulate the compressed gas directly in a pressure vessel as a driving source. Alternatively, a spring manipulator using a disc spring as a driving source is mainly used.

As described above, an accumulator using a compressible gas is used as a device for accumulating driving energy, and energy is supplied to the hydraulic actuator only by the accumulator. Similarly, in the case of the air manipulator, a high pressure air tank is used as a device for accumulating driving energy, and energy of the air manipulator is supplied only to the high pressure tank.

On the other hand, as a gas insulated switchgear to which some air manipulators are applied, a design using a compression spring force may be employed as a closing operation, but there is no design using a blocking operation as a spring operation.

The operating principle of the above-mentioned hydraulically operated and pneumatically actuated drive devices is quite similar, and the configuration examples are as follows.

That is, the injection operation is performed by switching the pressure to a high pressure on the other side by always applying a high pressure to one of the pistons having different hydraulic pressure areas. In addition, the shut-off operation is performed by switching one pressure to a low pressure in the driving device piston in the closed state.

The hydraulic manipulator and the manipulator are characterized by increasing the diameter of the piston so that a larger operating energy can be realized relatively easily as compared to the spring manipulator.

In the spring manipulator, it is impossible to change either spring force only because the blocking spring force and the closing spring force have a mutual relationship. In addition, a structure in which a mechanical shutoff spring force and a closing spring force are interlocked by a cam mechanism or the like is common, but it is impossible to realize a large operating force such as a hydraulic manipulator and an air manipulator due to the mechanical strength of the connecting parts.

In addition to the above-described features, the hydraulic manipulator and the air manipulator have an accumulator or a high pressure air tank as an energy accumulator, and have a structure for supplying energy to the manipulator by the energy accumulator. It has become possible to easily increase the number of continuous operable times of the gas insulation device.

In general, a gas insulated switchgear employing the hydraulic manipulator and the air manipulator described above is a continuous operation function according to conditions without additional supply of energy by a hydraulic pump compressor, etc. In some cases, a function of performing the operation or the closing operation → the closing operation three times or more may be required.

In addition, the common problem of the hydraulic manipulator and the air manipulator described above is that since the energy accumulator uses gas, the energy (hydraulic force accumulated in the accumulator) decreases according to the operation of the gas insulated switchgear.

Manipulators for gas insulated switchgear (for example, in the case of hydraulic manipulators) are operated at normal pressure change range (31.5 to 33.5 MPa) based on the rated pressure (31.5 MPa), and high-speed reclosing operation lock. The pressure for locking the operation to continuously perform the closing / closing: 30.0 MPa, the closing operation LOCK pressure (27.0 MPa) and the blocking operation LOCK pressure (25.5 MPa) are prescribed by the standard.

Because of this, the breaking current capability of the device needs to guarantee the lock pressure of each operation (blocking lock is 25.5 MPa). In addition, the mechanical strength design needed to be designed to the highest pressure range (33.5 MPa) in general, which made it impossible to design very economically.

As a result, the device is expensive and compact design is difficult. In addition, since the pressure fluctuates according to the change of ambient temperature by using gas, the accumulated energy decreases due to oil leakage and leakage of compressed air, so it is necessary to replenish the energy regularly by hydraulic pump compressor, etc. Auxiliary devices such as devices and safety devices are needed, which also affects the cost of the device.

If the spring manipulator is different from the hydraulic manipulator and air manipulator described above, the spring manipulator has a structure composed of two types of springs: a shutoff spring and a shutoff spring compression and closing spring.

All the spring manipulators that are currently commercialized have a mechanism for opening the driving energy of the closing spring and compressing the blocking spring while performing the closing operation of the gas insulated switchgear.

In addition, the gas insulated switchgear of the spring manipulator is capable of only a continuous operation of a blocking operation, a closing operation, and a blocking operation. After completion of the continuous operation, it is about 10 to 15 seconds as a time for accumulating the spring for injection. You will need some time.

It is only possible to perform continuous operation in blocking → closing → blocking, which is a major disadvantage of the spring manipulator compared to the hydraulic manipulator and the air manipulator. In particular, devices with a transmission voltage of 300kV or higher often fail to meet customer requirements.

In the case of the spring manipulator, the driving energy is maintained as a mechanical energy due to the compression force of the spring, so that the value does not change with time such as a hydraulic manipulator or an air manipulator. At the same time, the operation is driven by the compression energy of the spring force, so that the gas insulated switchgear is usually driven with the same energy. This is also the most significant difference compared to hydraulic and air manipulators, where operating energy is likely to change.

On the other hand, there is a Japanese Patent Application Laid-open No. Hei 5-298968 as a means for solving such a problem. The above-mentioned invention discloses a hydraulic manipulator that applies a plate spring to an oil accumulator. However, since the accumulator is commonly used for shut-off, the accumulator has the capacity of the present invention compared to the hydraulic manipulator having the same operating energy. Compared with the case it becomes significantly larger. Basically, it replaces the accumulator to which the pressurized gas which the conventional hydraulic manipulator is employ | adopted is just applying the spring and it does not solve the technical problem which the conventional hydraulic manipulator has.

Accordingly, the present invention is to collect the advantages of the hydraulic manipulator, air manipulator, spring manipulator, which is currently mainly used as a manipulator for driving the contactor of the gas insulated switchgear can solve the disadvantages of the three kinds of manipulators described above. There is provided a control device for a gas insulated switchgear.

That is, the present invention can be implemented in combination with the gas insulated switchgear compact design is possible to implement a manipulator for driving a gas insulated switchgear with a high degree of design freedom and economical and reasonable.

For example, a change in operating characteristics due to design irrationalities and changes in ambient temperature is caused by a large change in the driving force at the time of operation, which is a defect of the hydraulic manipulator and the air manipulator, from the opening operation lock pressure condition to the maximum pressure condition. And it is possible to solve the problems such as a large number of hydraulic pumps, compressors, auxiliary equipment by supplementing the leakage of high pressure oil high pressure air. In addition, it is possible to completely solve problems such as the difficulty in designing a large operating force, which is a drawback of the spring manipulator, and the interruption, closing, and blocking by the continuous operation function.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the following description will be presented a representative embodiment in the present invention to achieve the above technical problem. And other embodiments that can be presented with the present invention are replaced by the description in the configuration of the present invention.

The present invention is to solve the present problem, by the operation contact of the gas insulated switchgear to perform the shut-off operation to the spring operation device and the closing operation to the hydraulic operation device during the closing operation of the hydraulic device is a spring operation device of the It has a structure that can store driving energy by compressing blocking spring.

In addition, each of the spring-loaded operating device and the hydraulic control device of the present invention is configured to be completely independent, and according to the arrangement of the device is configured to mechanically move both manipulators by the link and lever for connecting. In addition, the hydraulic control device is configured as a system for automatically opening the high-pressure hydraulic fluid, which is the driving source of the hydraulic control device, when the closing operation of the spring-loaded control device is completed.

On the other hand, when the present invention is applied to the gas insulated switchgear, the current blocking characteristic according to the operation determination pressure, which was a problem of the gas insulated switchgear using the conventional hydraulic device and the air manipulator, is secured, and at the same time, the mechanical performance according to the highest pressure condition is achieved. The problem can be solved by applying a spring manipulator that can always implement a constant operating energy as an operation device for blocking operation and can also accumulate as a compression spring energy.

In addition, the present invention can also completely exclude the influence of the blocking operation characteristics due to the change in the ambient temperature, by applying a hydraulic operation device in the closing operation to the mechanical strength problem by the increase in the operating force which was a problem of the conventional spring manipulator The solution also became possible. In terms of the number of continuous operations, the accumulator capacity of the hydraulic manipulators for input and output was increased or decreased in accordance with the customer's specifications, so that the customer's requirements could be sufficiently changed without any major change. In addition, the overall configuration of the gas insulated switchgear can be mechanically moved by using a link and a lever, so that both operation devices formed by completely separating the spring operation device for shutoff and the hydraulic operation device for injection can be operated. Free design of the location is possible, and as a whole, the gas insulated switchgear has been miniaturized and realized reasonable and economical design.

Hereinafter will be described in detail based on the preferred embodiment of the present invention, the present invention is not limited by the embodiment.

{Example 1}

1 is a view showing a fully closed state of the operation device for gas insulated switchgear according to a preferred embodiment of the present invention. The operating device of the present invention is a hydraulic control device unit for performing the closing operation while compressing the spring-type control device unit 100 to perform the blocking operation, and the blocking spring 10 of the spring-type operating device unit 100 during the closing operation. It consists of 200. The manipulation unit 100, 200 is connected to a link 300 for connection. In addition, the movable contact A of the gas insulated switchgear C is connected to the link B by the peripheral ring lever 12 of the spring operated device unit 100.

The spring-type operating device unit 100 is connected to the peripheral ring lever 12 by the blocking spring rod 14 and the hinge 16 by the force of the blocking spring 10 that has accumulated the blocking energy. The peripheral ring lever 12 is in contact with the three-stage lever 20 by the roller lever 18 of the peripheral ring lever to maintain the rotational force. Since the clockwise rotational force is generated by the peripheral lever lever 12 and the movement in the three stage lever 20, the load direction from the peripheral ring lever 12 and the rotational central axis of the three stage lever 20 are moved only as necessary. It is designed.

The rotational force of the three-stage lever 20 generated by the principle described above is maintained by the two-stage lever 22. As with the peripheral contact lever 12 and the three-level lever 20, the clockwise rotational force acts on the two-speed lever 22 by the mutual contact between the three-speed lever 20 and the two-speed lever 22. do. The rotational force of the second stage lever 22 is maintained by mutual contact with the first stage lever 24. Since the rotary shaft of the first stage lever 24 is designed to be the mutual contact position and the dead point of the second stage lever 22, the first stage lever 24 is designed to have no rotational force. At this time, the first stage lever 24 is connected to the solenoid lever 26 and the link 28 by sandwiching the rotary shaft. In addition, the above-described levers 20, 22, and 24 are provided with reset springs 30, 32, and 34 so that the counterclockwise rotational force is applied to the levers 20, 22, and 24.

The operation piston 36 of the hydraulic operation unit 200 which performs the closing operation is connected to the peripheral ring lever 12 by sandwiching the link 300. At this time, the hydraulic force does not act on the operation piston 36 in the fully inserted state.

On the other hand, the hydraulic operation unit 200 is a switching valve 42 for supplying high pressure oil from the accumulator 38 for hydraulically driving the operation piston 36 to the operation piston control chamber 40 during the operation of the operation. ) And an injection solenoid 48 for driving an injection pilot valve 46 for supplying high pressure oil to the switching valve control chamber 44.

In addition, the position of the switching valve 42 is hydraulically maintained at the center of the switching valve 42 by maintaining the pressure of the pipe line 52 and the switching valve control chamber 44 for supplying the high pressure oil to the switching valve control chamber 44. An orifice 54 is designed to hold it. A hydraulic pump 56 for generating high pressure oil and supplying it to the accumulator 38 is designed, and a safety valve, a stop valve, a filter valve, and the like are incorporated therein.

The gas insulated switchgear C performs a cutoff operation in the state of FIG. 1, and the cutoff operation is given an electric cutoff signal to the gas insulated switchgear C or operated by manual operation.

Pressing the manual control button rotates the solenoid lever 26. In the case of electrically performing the same operation, a current flows through the blocking solenoid 58 so that the solenoid is driven, and the solenoid lever 26 is rotated in a clockwise direction so that the solenoid lever 26 and the rotating shaft are connected to each other. ) Also rotate clockwise and disconnect the two-stage lever (22). Accordingly, the rotation of the two-stage lever 22 and the three-stage lever 20 is released by the rotational force acting on the two-stage lever 22.

In this way, the connection between the three-stage lever 20 and the peripheral ring lever 12 is released and the blocking spring 10 is released, so that the peripheral ring lever 12 rotates clockwise to drive the movable contactor A in the blocking direction. Let's do it. The operating piston 36 mechanically connected by the link link 300 by the rotational movement of the peripheral ring lever 12 is operated in the left (left) direction.

2 is a view showing a state in which the blocking operation of the operation device for a gas insulated switchgear according to the present invention is performed.

The low pressure hydraulic oil in the operation piston control chamber 40 passes from the switching B port 60 through the switching C port 62 to be discharged into the hydraulic pump case 64 and the hydraulic pump case 64 is provided in the operation piston low pressure chamber 66. The hydraulic oil in the) flows. In addition, since the braking operation of the gas opening and closing device is performed at the end of the blocking operation, the operation piston 36 is provided with a blocking cushioning device portion 68. After reaching the stroke end controlled by the cushioning device portion 68, the blocking spring stop bar 70 supports the blocking spring force and simultaneously locks the blocking position.

3 is a view showing a cut-off state of the operation device for a gas insulated switchgear according to the present invention. The closing operation will be described below.

The gas insulated switchgear C performs the closing operation from the cutoff state of FIG. The closing operation is given an electrical closing signal to the gas insulated switchgear C as in the blocking operation, or operated by manual operation.

When the manual operation button is pressed, the pilot valve 46 for opening is opened, and in the case of operating with electric force, current flows through the injection solenoid 48 to drive the solenoid to open the pilot valve 46 for injection. Done. When the input pilot valve 46 is opened, high pressure oil is supplied to the switching valve control chamber 44 so that the switching valve 42 is switched to 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 is supplied from the accumulator 38 to the operation piston control chamber 40. At this time, the pressure-opening check valve 74 is opened and does not open the high pressure oil via the switching valve control chamber 44 and the pipe line.

By supplying high pressure oil to the operation piston control chamber 40, the operation piston 36 is driven in the right direction. The peripheral ring lever 12 connected to the link 300 for rotation is rotated counterclockwise, and thus the blocking spring 10 is compressed. By providing an input variable choke 76 between the accumulator 38 and the switching A port 72, the speed of the operation piston 36 can be adjusted. The high pressure oil is supplied from the orifice 54 provided in the switching valve 42 by holding the high pressure oil of the switching valve control chamber 44 during the closing operation.

4 is a view showing a state during the closing operation of the operation device for a gas insulated switchgear according to the present invention.

When the closing operation reaches the end, the operation piston 36 collides with the pressure opening check piston 78, and at this time, the pressure opening check piston 78 opens the pressure opening check valve 74 to switch valve control room 44. Of the high pressure oil is discharged to the switching port C (62).

The peripheral ring lever 12 connected to the operation piston 36 and the link 300 for connection has an overstroke at the same time as the positional relationship at which the operation piston 36 and the pressure-opening check piston 78 collide. to the stroke position. The over stroke is connected again to the peripheral ring lever 12, the third stage lever 20, the second stage lever 22, and the first stage lever 24 of the spring operated device unit 100. Therefore, by rotating the peripheral ring lever 12 counterclockwise more than the connection position of the blocked state to secure the gap (a) defined in the contact portion between the roller lever 18 and the three-stage lever 20. Indicates. At this time, the over stroke time can be secured by adjusting the characteristics of the input cushion device 80 to re-connect the lever. In addition, when the characteristics of the injecting cushion device 80 are made variable, it is possible to easily cope with other injecting operation characteristics according to the type of the gas insulated switchgear C. FIG.

5 is a view showing the end of the closing operation of the operation device for a gas insulated switchgear according to the present invention.

At the same time as the over stroke operation, the pressure release check valve 74 is opened and the switching valve 42 is operated in the right direction by discharging the high pressure oil of the switching valve control chamber 44 to the switching port C. As the switching B port 60 and the switching C port 62 communicate with each other, the high pressure oil of the operation piston control chamber 40 is discharged to the hydraulic pump case 64 so that the operation piston 36 loses the hydraulic driving force. At this time, the peripheral ring lever 12 in the over stroke state rotates clockwise to a position connecting with the third stage lever 20 by the force of the blocking spring 10. At the same time, the operation piston 36 connected to the link 300 for connection also moves to the left by a distance corresponding to the gap a to complete the closing operation.

Next, the correspondence at the time of abnormal operation of the operation device according to the present invention will be described.

The abnormal operation, which is a problem in the gas insulated switchgear C, should not be completely closed by the pilot valve 46 for inputting due to something after the feeding operation, and the high pressure oil is continuously supplied to the switching valve control room 44. Should be.

As described above, when an abnormal operation is issued, the pressure release check valve 74 installed at the position passing through each other via the switching valve control chamber 44 and the pipe is connected to the operation piston 36 by the pressure release check piston 78. Because it is pressed by, the relationship is not completely closed. Therefore, even when the injection pilot valve 46 is not completely closed due to an abnormal phenomenon, the pressure in the switching valve control chamber 44 can be kept at a low pressure, and the abnormal phenomenon can be confirmed by increasing the number of pump operations.

Finally, Figure 6 is a view showing an abnormal condition occurs after the operation of the operation of the gas insulation switchgear operating device according to the present invention.

As described above, the gas insulated switchgear to which the present invention is applied does not make an unreasonable design to secure the performance according to the circuit locking pressure condition and the mechanical performance according to the maximum pressure condition, which were problems of the conventional pneumatic hydraulic actuator. The cause must be solved, and at the same time, the influence of the blocking operation characteristic due to the change in the ambient temperature can be completely eliminated. In addition, if the hydraulic manipulator is adopted for the closing operation, the mechanical strength problem that has been a problem in the conventional spring manipulator can be solved, and the cumulative operation number can be easily coped with by changing the accumulator capacity.

In addition, the configuration of the gas insulated switchgear as a whole consists of a spring operation device for shutoff and a hydraulic manipulator for input operation independently, and mechanically moves. The miniaturization and rationalization of the apparatus of the whole apparatus was realized.

Claims (7)

A gas insulated switchgear having a current interrupting device or an electric circuit input device constructed from a movable contact contacting a fixed contact installed in a ground container injecting insulating gas, And a closing operation as a spring operating device and a closing operation as a hydraulic operating device for the operating device for driving the movable contactor in the breaking direction or the closing direction. The method of claim 1, And a closing operation is performed by the spring operating device, and a shutoff operation is performed by the hydraulic control device. In the gas insulated device provided with the fixed contactor installed in the ground container which injected the insulating gas, and the electric current interrupter or the electric circuit input device comprised from the movable contact which contact | connects the said fixed contactor, And a spring operation device for driving the movable contactor in the blocking direction and a hydraulic operation device for driving the movable contactor in the input direction, respectively. The method of claim 3, On the link link and the lever which separate and arrange the spring operation device for driving the movable contactor in the blocking direction and the hydraulic operation device for driving the movable contactor in the closing direction with respect to the operation device for the gas insulated switchgear. The gas insulated switchgear is characterized in that it is operated by an input hydraulic device having a mechanism for mechanically moving the two operation devices, and has a structure capable of accumulating driving energy of the blocking spring type operation device. Controls. The method of claim 4, wherein When the closing operation of the hydraulic control device is completed with respect to the closing hydraulic control device, at the same time, the driving energy accumulation of the blocking spring control device is completed and the high pressure hydraulic oil which is the driving source of the hydraulic control device is automatically opened. A control device for a gas insulated switchgear, characterized in that it has a mechanism for losing the driving force generated by the device. delete In the gas insulated device provided with the fixed contactor installed in the ground container which injected the insulating gas, and the electric current interrupter or the electric circuit input device comprised from the movable contact which contact | connects the said fixed contactor, Applying a coil spring or a dish spring as a spring operating device drive source for driving the movable contactor in the blocking direction, an accumulator or coil spring using compressible gas energy as a hydraulic operating device drive source for driving the movable contactor in the input direction or An operation device for gas insulated switchgear, characterized in that the accumulator having a plate spring is used.

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