KR101184267B1 - An apparatus to test for an hydraulic actuator of an turbine of an generator and an method to test for it - Google Patents

Abstract

PURPOSE: An apparatus and a method for inspecting a hydraulic actuator for a power plant turbine is provided to inspect an emergency stop operation of a hydraulic actuator and to individually inspect each component status during the emergency stop operation. CONSTITUTION: An apparatus for inspecting a hydraulic actuator for a power plant turbine(10) comprises a hydraulic actuator(100), multiple sensors, a control unit(400), and an output unit(500). Multiple passages for FAS(Fluid Actuator Supply) flow rate and ETS(Fluid Emergency Trip Supply) flow rate are formed in the hydraulic actuator along a main body, a servo valve, a solenoid valve, and a shutoff valve. Multiple sensors detect operating information of the hydraulic actuator including flow rate and pressure information of the passages and lifting information of a piston. The control unit controls the operation of the hydraulic actuator and process the operating information detecting in the multiple sensors. The output unit outputs results of the operating information processed in the control unit. [Reference numerals] (400) Control unit; (500) Output unit

Description

An apparatus to test for an hydraulic actuator of an turbine of an generator and an method to test for it}

The present invention relates to an emergency stop operation inspection apparatus for a hydraulic actuator and an inspection method using the same, and more particularly, to an emergency stop operation inspection apparatus and an inspection method for a hydraulic actuator for opening and closing a turbine valve of a power plant.

The turbine output of the power plant is controlled by controlling the amount of steam entering the turbine as the turbine valve opens and closes. At this time, opening and closing of the turbine valve is controlled by a hydraulic actuator installed on one side of the turbine valve.

1 is a cross-sectional view showing a cross section of a hydraulic actuator for a power plant. Hereinafter, a hydraulic actuator for a power plant will be described with reference to FIG. 1.

One side of the main body of the hydraulic actuator has an entry port through which a fluid actuator supply (FAS) flow rate and a fluid emergency trip supply (ETS) flow rate are formed. And the other side of the main body is formed with a drain port (drain port) for discharging the fluid inside the main body to the outside. A flow path through which the FAS and the ETS proceed and a fluid drain to coller (FCD) flow path through which the FAS and the ETS drain to the drain port are provided between the entry port and the drain port.

On the other hand, one side of the hydraulic actuator is provided with a piston which is installed to be able to lift in the vertical direction. At the bottom of the piston, a disc dump valve is formed. Therefore, as shown in FIG. 1, while the ETS flow rate supports the disc dump valve lower side, the FAS flow rate flows into the lower side of the piston to control the opening and closing of the turbine valve while the piston moves up and down.

Meanwhile, a servo valve, a solenoid valve, and a shut-off valve are installed outside the hydraulic actuator body. The servo valve controls the height at which the piston moves up and down by controlling the flow rate of the FAS provided to the lower side of the piston by moving the position of the servo valve spool according to the input signal. The solenoid valve serves to selectively switch the piston to the emergency stop state in an emergency situation by selectively blocking the flow path where the ETS flow rate is provided below the disk dump valve according to the position of the solenoid valve spool. In addition, the shutoff valve is configured to block a path through which the FAS flow rate flows while the shutoff valve spool is moved by the elastic member as the solenoid valve is switched to the emergency stop state.

Here, the hydraulic actuator used for the power plant turbine operates to close the valve of the turbine by switching to the emergency stop mode when an external emergency situation such as an earthquake or fire occurs. Therefore, it is necessary to check frequently whether the hydraulic actuator can normally perform the emergency stop operation. However, in the conventional emergency stop operation checking method, it is only possible to check whether the actuator is in an emergency stop operation, and it is difficult to specifically check the operation contents of each component of the actuator.

In order to solve the above-described problems, the present invention checks whether the hydraulic actuator can perform the emergency stop operation normally, and can specifically grasp the operation of each component of the hydraulic actuator when performing the emergency stop operation. It is to provide an inspection apparatus and an inspection method of the actuator.

The object of the present invention described above is an emergency stop operation inspection apparatus for a hydraulic actuator for a power plant turbine having a piston and a plurality of valves which are provided to move up and down, wherein the FAS flow rate supporting the lower end of the piston and the piston below the piston A hydraulic actuator in which an ETS flow path for supporting a bottom of a space in which the FAS flow rate is accommodated is formed, a plurality of sensors for sensing operation information including flow rate information of the flow path, hydraulic information, and lifting position information of the piston; ETS flow rate is achieved by the emergency stop operation inspection apparatus of the hydraulic actuator for power plant turbine including a control unit for selectively blocking the flow path proceeding to the lower side of the piston, and receiving and processing the operation information sensed by the plurality of sensors Can be.

The inspection apparatus further includes an output unit configured to output a result of processing the driving information to the user.

The hydraulic actuator includes a solenoid valve forming a part of a flow path through which the ETS flow rate flows, and the control unit selectively excites the spool of the solenoid valve to selectively block the traveling path of the ETS flow rate.

The output unit is configured to output information including an hourly pressure change of the ETS flow path and an hourly position change of the piston from the time when the control unit controls the spool of the solenoid valve to be excited.

On the other hand, the object of the present invention described above in the emergency stop operation inspection method of the hydraulic actuator for a power plant turbine having a piston and a plurality of valves are installed to be elevated, (a) the flow rate of the FAS for supporting the lower end of the piston and the Providing an ETS flow rate supporting a bottom of a space in which the FAS flow rate is accommodated at a lower side of the piston; (b) rapidly lowering the piston by blocking a path through which the ETS flow rate flows below the piston; During the steps (a) and (b), detecting operation information including flow rate information, hydraulic pressure information, and lifting position information of the piston through a plurality of sensors; and (d) Transmitting the operation information sensed by the sensor to the controller; Emergency stop operation inspection of the hydraulic actuator for power plant turbine comprising a It can also be achieved by four methods.

The emergency stop operation checking method may further include (e) outputting a result of processing the driving information transmitted to the controller to a user.

In this case, the plurality of valves of the hydraulic actuator includes a solenoid valve forming a part of the flow path through which the ETS flow rate proceeds, and in step (b), the controller excites the spool of the solenoid valve to advance the flow path of the ETS flow rate. Can be blocked.

Furthermore, the step (e) may be configured to output information including a time-dependent pressure change of the ETS flow path and a time-dependent position change of the piston from a time point at which the control unit controls to excite the spool of the solenoid valve.

According to the present invention, in addition to the inspection of the emergency stop operation of the hydraulic actuator, by specifically checking the state of each component of the hydraulic actuator during the emergency stop operation, the specific details of the abnormality of the hydraulic actuator and the position of the occurrence of the abnormality Can provide results.

1 is a cross-sectional view showing a cross section of a hydraulic actuator for a power plant,
Figure 2 is a schematic diagram showing an inspection apparatus of a hydraulic actuator for a power plant turbine according to an embodiment of the present invention,
3 is a sectional view showing an evaporation state of a hydraulic actuator,
4 is a cross-sectional view showing the state of dehydration of the hydraulic actuator
5 is a sectional view showing a hydraulic actuator in an emergency stop operation state;
6 is a sectional view showing a hydraulic actuator in a safe stop operation state;
7 is a flowchart illustrating a test method using a power plant hydraulic actuator test apparatus of the present invention,
8 to 13 are examples of outputs output through an output unit from the hydraulic actuator inspection method of FIG. 7.

Hereinafter, a hydraulic actuator inspection apparatus and inspection method for a power plant turbine according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the positional relationship of each component is explained based on the drawings in principle. In addition, the drawings may be displayed by simplifying the structure of the invention or by exaggerating if necessary for the convenience of description. Therefore, the present invention is not limited thereto, and various other devices may be added, modified or omitted.

Figure 2 is a schematic diagram showing an inspection system of a hydraulic actuator for a power plant turbine according to an embodiment of the present invention. As shown in FIG. 2, the inspection apparatus 10 of the hydraulic actuator for a power plant turbine according to the present embodiment is connected to the actuator 100, a plurality of sensors 300 for detecting various operation information of the actuator, and the sensor. It is configured to include a control unit 400.

The hydraulic actuator 100 includes a main body 110 in which a piston 150 is liftable on one side, a servo valve 120, a solenoid valve 130, and a detachable installation in the main body. And shut-off valve 140. Inside the hydraulic actuator, a plurality of flow paths through which a fluid actuator supply flow rate (FAS) and a fluid emergency trip supply flow rate (ETS) flow are formed. The plurality of flow paths are formed from the entry port 170 formed at one side of the main body to the drain port 180 via the servo valve 120, the solenoid valve 130, and the shutoff valve 140. Here, the servo valve 120, the solenoid valve 130, and the shutoff valve 140 control the operation of the hydraulic actuator 100 by blocking, changing, or adjusting the flow rate of the flow path of the FAS flow rate or the flow rate of the ETS flow rate. Various operations of the hydraulic actuator will be described in more detail below.

The plurality of sensors collect various information at various positions of the hydraulic actuator 100 when the hydraulic actuator 100 is operated. The plurality of sensors may include a plurality of flow sensors 331, 332, 333 (see FIGS. 3 to 7) passing through a flow rate passing through a specific flow path, and a plurality of hydraulic sensors 341, 342, 343, which measure the oil pressure of the specific flow path. 344, 345, and FIGS. 3 to 7), a sensor 320 measuring an input current signal input to a servovalve, a displacement sensor 310 measuring a lifting position of a piston, and the like, to measure various driving information. do.

A plurality of test blocks may be installed between the main body of the hydraulic actuator and each valve. As shown in FIG. 2, a first test block 210 is installed between the main body 110 and the servovalve 120 of the hydraulic actuator, and a second test block 220 is provided between the main body and the solenoid valve 130. In addition, a third test block 230 is installed between the main body 110 and the shutoff valve 140. Each test block has a plurality of flow paths connecting the flow path of the body and the flow path of each valve. Some or all of the plurality of sensors are installed in the test block to measure operation information such as flow rate or oil pressure passing through a specific flow path.

Meanwhile, the controller 400 controls the operation of the hydraulic actuator 100 while inspecting the hydraulic actuator 100. For example, the controller 400 controls the FAS flow rate and the ETS flow rate flowing into the entry port 170, controls the input signal provided to the servo valve 120, or selectively controls the spool of the solenoid valve 130. Various inspections can be performed by controlling the operation contents of the hydraulic actuator 100 such as exciting. In this case, the controller 400 may drive the hydraulic actuator 100 according to the operation mode set by the user, or may operate the hydraulic actuator according to a pre-stored process.

 In addition, the controller 400 is connected to the plurality of sensors by wire or wirelessly. Therefore, various operation information of the hydraulic actuator 100 measured by the plurality of sensors is provided to the controller 400. In this case, the driving information provided from the plurality of sensors may be data continuously measured while driving is in progress, or may be data measured at a specific time point during driving. The controller 400 may receive and process the driving information.

The result processed by the controller 400 is displayed to the user through a separate output unit 500. Here, the processed result may be a process of processing the data measured by each sensor in the form of a table or a graph during the hydraulic actuator 100 inspection operation, by comparing the data measured by each sensor with the data value of the normal range, respectively It may be a result of determining whether or not the components of the abnormal. The output unit 500 may be configured to output the processed result through a printed matter, or may be configured to be displayed to the user as image information through a separate display.

As described above, the hydraulic actuator inspection apparatus 10 according to the present exemplary embodiment may perform the inspection while controlling the operation contents of the hydraulic actuator 100 by using the controller 400, according to various operation modes of the hydraulic actuator 100. It is possible to collectively check for normal operation. In addition, since operation information is measured using a plurality of sensors installed at main positions of the hydraulic actuator 100 during operation, it is possible to determine in detail whether each component is defective in the overall structure of the hydraulic actuator. In addition, by providing the result to the user through the output unit, the user can easily grasp the inspection result of the hydraulic actuator.

Hereinafter, the operation of the hydraulic actuator according to the operation mode of the controller will be described in more detail.

3 is a cross-sectional view showing the evaporated state of the hydraulic actuator, Figure 4 is a cross-sectional view showing the depressed state of the hydraulic actuator. Here, the evaporation state means an operation state in which the piston is raised to open the turbine valve to increase the amount of steam supplied to the turbine, and the desensitization state is an operation state in which the piston is lowered to close the turbine valve. Means.

First, the FAS flow rate and the ETS flow rate are introduced into the hydraulic actuator through the entry port 170. Here, the servo valve 120, the solenoid valve 130, or the shutoff valve 140 are positioned on the path through which the FAS flow rate and the ETS flow rate proceed. Each valve has at least one spool and an elastic body for opening and closing an internal flow path or changing a direction of the flow path. Hereinafter, for convenience of description, the servo valve 120 includes a first spool 121 and a first elastic body 122, and the solenoid valve 130 includes a second spool 131 and a second elastic body 132. The shutoff valve 140 is referred to as having a third spool 141 and a third elastic body 142.

The ETS flow rate introduced through the ETS entry port 172 passes through the flow path of the solenoid valve 130. At this time, when the excitation is made by the solenoid structure, the second spool 131 moves to the left side in the pressing direction of the second elastic body 132, and when the excitation is not made, the second spool 131 is in close contact with the right side by the second elastic body. The position of the second spool 131 is determined by the control of the controller 400. As shown in Figs. 3 and 4, in the evaporation state and the deceleration state, the second spool 131 is controlled in the non-excited state, and is positioned to open the flow path of the ETS flow rate. Therefore, the ETS flow rate flows into the lower side of the disk dump valve, raises the disk dump valve, and forms a closed space below the cylinder. Further, the additionally introduced ETS flow proceeds in the direction of the shutoff valve to press the third spool 141 to the left to secure a flow path of the FAS flow rate.

Meanwhile, the FAS flow rate introduced through the FAS entry port 171 flows into the shutoff valve 140. Despite the elastic force of the third elastic body 142, the third spool 141 of the shutoff valve is pressurized by the ETS flow rate as described above to open a path through which the FAS flow rate proceeds. Therefore, the FAS flow rate passes through the main body 110 to the servovalve 120 via the shutoff valve 140.

As shown in FIGS. 3 and 4, the FAS flow rate flows from the main body 110 to the servo valve 120 along three flow paths. The flow rate of the FAS traveling along the flow path formed on the left side of the three paths is injected to the nozzle 123 formed above the first spool 121 to determine the position of the first spool 121 according to the operation mode. In addition, the flow rate of the FAS traveling along the flow path formed to the right may be selectively introduced into the space below the piston according to the position of the first spool 121 to raise the piston.

Specifically, the nozzle 123 supplies the FAS flow rate to both sides of the first spool. In this case, the nozzle 123 may control the injection direction by the direction control module 124 to adjust the ratio of the FAS flow rate supplied to both sides of the first spool 121. In this case, the direction control module 124 may include an electrical member such as an electromagnet, and control the injection direction of the nozzle according to the magnitude of the input signal current provided to the servovalve 120.

At this time, one side of the first spool 121 is provided with a first elastic body (122). Therefore, the position of the first spool 121 is determined by the elastic force of the first elastic body 122 and the FAS flow rate supplied to both sides of the first spool. Therefore, the controller 400 may control the input signal current provided to the servovalve 120 to determine the position of the first spool 121 according to the operation mode.

3 discloses the position of the first spool 121 in an evaporated state. In this case, the first spool 121 is positioned so that the FAS flow rate flowing into the right flow path of the servo valve 120 can be supplied to the lower side of the piston, thereby raising the piston 150.

4 discloses the position of the first spool 121 in the depressed state. In the decelerated state, the first spool 121 blocks the path through which the FAS flow rate flows into the right flow passage of the servo valve 120, and is positioned such that the FAS flow rate under the piston can be drained through the drain flow passage. Therefore, the piston 150 lowers by gradually draining the FAS flow rate under the piston through the servovalve.

Therefore, the controller 400 controls the input signal of the servo valve 120 when the piston 150 is to be raised or lowered to a specific position, thereby changing the position of the first spool 121 so that the piston 150 It is possible to adjust to supply or discharge the FAS flow rate at the bottom. In addition, although not shown in the drawing, when the control unit intends to fix the position of the piston, the controller controls the first spool to be positioned at a position where the flow path connected to the lower side of the piston can be blocked from the right flow path and the drain flow path of the servovalve. Can be stopped.

In this case, a first flow rate sensor 331 is provided in the first test block 210, a second flow rate sensor 332 is formed in the second test block 220, and a third flow rate sensor 333 is formed in the third test block 230. Can be installed. 3 and 4, the first flow sensor 331 measures the flow rate of the oil leaked from the servo valve 120 along the flow rate of the drain flow path, and the second flow rate sensor 332 and the second flow rate sensor 332 and the first flow rate sensor. The three flow rate sensors 333 may measure the flow rate of leakage from the solenoid valve and the shutoff valve. Therefore, according to the operation mode set by the controller 400, whether each spool is located at a normal position, or the flow rate leaked through the inner surface of each valve and between the spools is measured to determine the wear level of the spool or the valve section. It is possible to figure out.

3 and 4, in the output flow path of the second test block 220, a first hydraulic sensor 341 for measuring the oil pressure of the ETS flow path provided under the disk dump valve 160 is provided. Is installed. In addition, a second oil pressure sensor 342 for measuring the oil pressure of the ETS flow path, a third oil pressure sensor 343 for measuring the oil pressure of the FAS flow path, and a fourth oil pressure for measuring the oil pressure of the drain flow path beneath the shutoff valve 140. Sensor 344 may be installed. In addition, a fifth hydraulic sensor 345 may be installed below the piston to measure the size of the hydraulic pressure supporting the piston.

The plurality of hydraulic sensors 341, 342, 343, 344, and 345 may measure the oil pressure of each flow path to determine whether the flow path is abnormal and whether the driving mode is normally performed. In addition, the control unit 400 is provided with the measured values of the hydraulic sensors installed in different positions in real time, it is possible to measure the relative operating characteristics between each component of the actuator according to the operation content and the time required for switching the operation mode, etc. Do.

5 is a cross-sectional view showing a hydraulic actuator in the emergency stop operation. The inspection apparatus of the hydraulic actuator according to the present embodiment may also measure whether the hydraulic actuator normally performs emergency stop operation through control of the controller.

The second spool of the solenoid valve remains non-excited while the piston of the hydraulic actuator is normally elevated in normal operating conditions such as the evaporation and deceleration conditions described above. Therefore, the path through which the ETS flow rate proceeds is opened, so that the ETS flow rate is provided to the lower side of the disk dump valve 160 through the solenoid valve 130. As a result, the disk dump valve 160 is raised to form a closed space in which the FAS flow rate is accommodated below the piston 150 (see FIGS. 3 and 4).

In contrast, when the emergency stop operation is performed as shown in FIG. 5, the disk dump valve 160 of the hydraulic actuator descends and the FAS flow rate of the piston lower side is drained all at once, thereby rapidly decreasing the piston.

Specifically, the control unit 400 excites the second spool 131 of the solenoid valve 130 so that the hydraulic actuator 100 can perform an emergency stop operation. The excited second spool 131 overcomes the elastic force of the second elastic body 132 by the electromagnetic force acting in the left direction and moves to the left side as shown in FIG. 5. The second spool 131 moved to the left blocks the path through which the ETS flow rate passes through the solenoid valve 130, thereby restricting the flow of the ETS flow rate toward the disc dump valve and the shutoff valve side.

At this time, the disk dump valve 160 is lowered as the ETS flow rate that supports the disk dump valve 160 is not additionally supplied. Therefore, the flow rate of the FAS supporting the piston 150 is rapidly drained through the space in which the disc dump valve 160 opens while descending, and the piston 150 is rapidly lowered.

Meanwhile, in the normal operation state, the shutoff valve 140 secures a path in which the FAS flow proceeds upward as the ETS flow pressurizes the third spool 141 to the left (see FIGS. 3 and 4). In contrast, during the emergency stop operation, the flow rate of the ETS to the shutoff valve 140 is limited. Therefore, the third spool 141 moves to the right by the restoring force of the third elastic body 142 to block the path of the FAS flow.

As such, the controller 400 excites the second spool 131 of the solenoid valve 130 to block the traveling path of the ETS flow rate and the FAS flow rate of the hydraulic actuator 100, and to rapidly lower the piston 150. Control to perform stop operation.

In addition, the controller 400 may check whether the emergency stop operation of the hydraulic actuator 100 is normally performed and the time required for the emergency stop operation to proceed using the information detected by the sensors 300. . In addition, when the emergency stop operation is not normally performed, it is possible to easily determine the cause of the abnormality by using the information measured by the plurality of flow rate sensors and hydraulic pressure sensors.

 Fig. 6 is a sectional view showing the hydraulic actuator in a safe stop operation state. The hydraulic actuator inspection apparatus according to the present embodiment can check whether the hydraulic actuator properly performs the safety stop operation.

The emergency stop operation described above is an operation for rapidly lowering the piston by controlling to drain the FAS flow rate supporting the piston. In contrast, the safety stop operation shown in FIG. 6 is an operation for checking the safety characteristic of the hydraulic actuator 100 designed to lower the piston 150 by its own safety design at the end of the operation. Therefore, the safe stop operation proceeds in such a manner as to check whether the piston 150 safely descends when the hydraulic actuator 100 is stopped by setting an environment in which the hydraulic actuator 100 cannot be controlled.

Specifically, the control unit 400 blocks the input signal current provided to the servovalve 120 to test the safe stop operation to create a virtually uncontrollable environment. At this time, when the input signal current provided to the servo valve 120 is cut off, the position of the first spool 121 is no longer controlled by the flow rate injected from the nozzle, but is positioned by the restoring force of the first elastic body 122. Is determined. Therefore, as shown in FIG. 6, the first spool 121 is in close contact with the right direction with reference to FIG. 6.

The position of the first spool 121 allows the flow path of the FAS flow rate formed from the servo valve 120 to the lower side of the piston 150 to open in the direction of the drain flow path. Therefore, the FAS flow rate which supported the piston 150 is drained to the drain flow path through a servo valve, and the piston 150 gradually descends and stops.

As such, the control unit 400 creates an uncontrollable environment by cutting off the input signal current provided to the servovalve 120, so that the hydraulic actuator 100 supports the piston 150 by its own safety design. It is controlled to perform a safety stop operation of lowering the piston 150 by draining it to the outside.

In addition, the controller 400 may check whether the safety stop operation of the hydraulic actuator 100 is normally performed and the time required for the safety stop operation to proceed using the information detected by the sensors 300. . In addition, when the safety stop operation is not normally performed, it is possible to easily determine the cause of the abnormality by using the information measured by the plurality of flow sensors and the hydraulic sensors.

Hereinafter, an embodiment of an inspection method using the inspection apparatus of the hydraulic actuator for a power plant turbine described above with reference to FIGS. 7 to 13 will be described in detail.

7 is a flowchart illustrating a test method using a power plant hydraulic actuator test apparatus of the present invention.

First, the operation content of the hydraulic actuator is set from the control unit 400 (C10). It is possible for the user to directly set the operation contents of the hydraulic actuator, and it is also possible to proceed by setting the operation contents with the inspection process already stored.

Meanwhile, the controller 400 controls the flow rate of the FAS and the flow rate of the ETS to the entry port. Then, the input signal current of the servo valve 120 and the position of the second spool 131 of the solenoid valve 130 are controlled to drive the hydraulic actuator according to the set operation contents (A10).

First, the operation contents by the controller 400 may be operated to raise the piston 150 as much as possible at an initial position where the piston 150 is in a lowered state. Then, after waiting for a predetermined time in a state where the piston 150 is raised as much as possible, the piston 150 may be returned to the initial position (A20).

In this step, the controller 400 maintains the second spool 131 of the solenoid valve 130 in a non-excited state. The first spool 121 is positioned to control the input signal current to the servovalve 120 so that the FAS flow rate is supplied to the lower part of the piston as much as possible. When the piston is opened to the maximum, the first spool 121 is moved to block the flow path of the FAS flow rate connected to the lower part of the piston for a predetermined time, and then the first spool 121 is moved again to increase the FAS flow rate at the lower part of the piston. Drained to the drain flow path.

In this embodiment, it is possible to control the piston to be raised twice from the initial position after returning as much as possible.

In addition, the control unit 400 drives the piston of the hydraulic actuator step by step to the first position, the second position, the third position, and the like, and then descends to the third position, the second position, and the first position step by step. Can be controlled (A30).

In this case, the operation of raising the piston 150 step by step and then stepping down the first spool by controlling the input signal current of the servo motor while maintaining the second spool 131 in a non-excited state as described above It can control by moving the position of 121 in steps.

In the present embodiment, after the piston 150 of the hydraulic actuator 100 sequentially rises from the initial position to the 20% position, 40% position, 60% position, 80% position and maximum lift position relative to the maximum ascending position. The operation can be controlled to gradually descend to the initial position through the position of 80%, the position of 60%, the position of 40%, and the position of 20%.

Thereafter, the controller 400 may perform an emergency stop operation. At this time, the control unit 400 controls the input signal current of the servo valve 120 while maintaining the second spool 131 of the solenoid valve 130 in a non-excited state in order to set the normal operating state. ) Can be maintained at approximately 50% increase. In addition, the second spool 131 of the solenoid valve 130 is switched to the excited state assuming an emergency situation. As a result, the ETS flow path of the solenoid valve is blocked, and the disk dump valve is lowered to perform the emergency stop operation in which the piston 150 rapidly descends while the FAS flow rate is drained. At this time, as the ETS flow path is blocked, the third spool of the shutoff valve is moved to block the additional supply of the FAS flow rate (A40).

When the emergency stop operation is completed, the control unit 400 switches the second spool 131 of the solenoid valve 130 to the non-excited state and supplies the ETS flow rate and the FAS flow rate. Then, once again raising the piston in the normal operating state, it may be performed to step down (A50).

In this step, the piston 150 is sequentially raised to the position of 30%, the position of 70% and the position of 100% relative to the maximum ascending position at the initial position of the piston 150, and then sequentially to the position of 70%, the position of 30% and the initial position. Can be lowered.

Thereafter, the controller 400 may perform a safe stop operation (S60). At this time, the control unit 400 controls the input signal current of the servo valve 120 to maintain the second spool 131 of the solenoid valve 130 in an excited state in order to set the normal operating state. The state which raised may be maintained. Assuming that the hydraulic actuator is not controlled, the input signal current to the servo motor is cut off. As a result, the flow path and the drain flow path of the FAS flow rate in which the first spool 121 of the servovalve 120 is mechanically moved by the elasticity of the first elastic body 122 and connected to the lower part of the piston are opened. Therefore, the FAS flow rate, which has been providing hydraulic pressure at the lower side of the piston, is drained to the outside through the lower side of the first spool 121, whereby the piston 150 rapidly descends to perform the emergency stop operation.

The control unit 400 according to the present embodiment proceeds to operate the hydraulic actuator 100 in accordance with the steps described above. However, the present invention is not limited to the above-described steps, and in addition to this, the driving contents may be variously changed according to the needs of the user.

On the other hand, while the hydraulic actuator is performing the operation as described above, the plurality of sensors 300 continuously measures the various operation information of the hydraulic actuator (B10). The plurality of sensors include a flow rate sensor installed in each test block, a plurality of hydraulic sensors formed in respective flow paths of a shutoff valve, a displacement sensor for detecting a lift position of a piston, and a sensor for measuring an input signal current provided to a servo motor. It may include. Such a plurality of sensors may measure the corresponding information in real time at each position while the hydraulic actuator performs the operation, and transmit the measured value to the controller 400 (B10).

In addition, the controller 400 processes the driving information provided from the plurality of sensors. Here, the controller 400 may process the operation information provided from the plurality of sensors in the form of a table or a graph so as to conveniently interpret the information, or may directly process the abnormality in comparison with the normal range of each data. (C20).

The result processed by the control unit 400 is transmitted to the output unit 500 to proceed with the step displayed by the user. This step may be provided to the user through the output of the processing result or as a printed output. In the present exemplary embodiment, the output unit may include both an image display apparatus and a printing apparatus to display the processing result on the screen, and may print the processing result as printed matter output through the printing apparatus (D10).

8 to 13 are examples of outputs output through an output unit from the hydraulic actuator inspection method of FIG. 7. Specifically, FIGS. 8 to 12 are graphs showing values measured by several sensors during an emergency stop operation, and FIG. 13 is a view showing comprehensively the inspection results of various operation contents of the hydraulic actuator including the emergency stop operation. One graph.

Specifically, FIG. 8 is a graph in which the displacement sensor 310 measures the displacement of the piston 150 over time from the time when the emergency stop control is started. When the emergency stop operation control signal is provided from the control unit 400, the piston 150 starts to descend from the time point of 15 minutes 11.2 seconds on the graph of FIG. 8 and determines that the lowering of the piston 150 is completed at the time point of 15 minutes 11.6 seconds after 0.4 seconds. Can be.

9 and 10 are graphs in which the second oil pressure sensor 342 and the third oil pressure sensor 343 measure time-specific oil pressures of the ETS flow path and the FAS flow path in the shutoff valve 140 during the emergency stop operation. As shown in FIGS. 9 and 10, as the ETS flow path is blocked during the emergency stop operation, the ETS oil pressure of the isolation valve 140 decreases relatively slowly, and the FAS oil pressure of the isolation valve 140 is the third spool 141. It can be seen that the relative decrease rapidly due to the movement of. In addition, it can be seen from the comparison of FIG. 9 and FIG. 10 that the ETS hydraulic pressure is started before the FAS hydraulic pressure changes.

11 and 12 are graphs in which the second flow rate sensor 332 and the third flow rate sensor 333 measure the amount of leakage of the solenoid valve 130 and the shutoff valve 140 over time during the emergency stop operation. 11 and 12, the leakage amount and leakage pattern of the solenoid valve 130 and the shut-off valve 140 are shown before and after the movement time of the second spool 131 and the third spool 141 during the emergency stop operation. I can figure it out. Here, it can be seen that the shutoff valve is maintained for a relatively long time compared to the solenoid valve.

As described above, in the emergency stop operation inspection apparatus and the inspection method according to the present embodiment, it is possible to grasp the operation of each component during the emergency stop operation of the hydraulic actuator for each time zone. Therefore, the time, operation pattern and abnormality of each component may be specifically understood from the emergency stop operation control time point of the controller.

On the other hand, the graph of Figure 13 is a comprehensive view showing the results of the inspection of the various operating contents of the hydraulic actuator including the emergency stop operation, the intuitive state of the state of the hydraulic actuator 100 through the schematic shape of the graph shown in FIG. It is possible to analyze. In addition, by superimposing the data measured by the plurality of sensors 300 for each time the operation including the emergency stop operation proceeds, it is possible to more easily identify and check the correlation between the respective components. .

As described above, the emergency stop operation inspection method according to the present embodiment may specifically provide the user with the abnormal position and the abnormality of the hydraulic actuator, and the user may easily check the inspection result through the output.

However, in the above-described embodiment, the inspection method for collectively checking not only the emergency stop operation of the hydraulic actuator but also the normal relative operation and the safety stop operation has been described. However, the present invention is not limited thereto, and only the emergency stop operation is checked individually. It is of course also possible to proceed.

In addition, in addition to the matters described in the above embodiments, those skilled in the art to which the present invention pertains will be able to carry out the present invention by various modifications therefrom, and thus the technical protection scope of the present invention is attached to the appended claims. It should be determined by the scope.

100: hydraulic actuator 120: servo valve
130: solenoid valve 140: shut-off valve
150: piston 300: a plurality of sensors
400: control unit 500: output unit

Claims (10)

In the inspection apparatus of the power plant turbine hydraulic actuator provided with a main body in which a piston can be elevated, and a servo valve, a solenoid valve, and a shutoff valve provided in the main body,
Hydraulic flow rate of the FAS flow rate for supporting the lower end of the piston and the flow path of the ETS flow rate for supporting the bottom surface of the space in which the FAS flow rate is accommodated below the piston is formed along the main body, the servo valve, the solenoid valve, and the shutoff valve. Actuators;
A plurality of sensors configured to detect operation information of the hydraulic actuator including flow rate information, pressure information, and lift information of the piston passing through the main body, the servo valve, the solenoid valve, and the shutoff valve;
A controller for controlling the operation of the hydraulic actuator and receiving and processing the operation information sensed by the plurality of sensors; And,
An output unit configured to output a result of processing the driving information by the controller to a user;
A first test block is installed between the main body of the hydraulic actuator and the servo valve, a second test block is installed between the main body and the solenoid valve, and a third test block is installed between the main body and the shutoff valve. Some or all of the plurality of sensors are installed in the first test block, the second test block and the third test block,
The control unit is the hydraulic actuator,
Raising and lowering the piston sequentially;
Performing an emergency stop operation of the hydraulic actuator for lowering the piston by selectively blocking a flow path in which the ETS flow rate proceeds to the lower side of the piston by exciting the second spool of the solenoid valve while the piston is raised; and
In the hydraulic actuator, the input signal provided to the servo valve is interrupted while the piston is raised, and the first spool of the servo valve is moved by a restoring force of an elastic body provided at one side thereof so that the flow rate of the FAS under the piston is drained. An inspection apparatus for a hydraulic actuator for a power plant, characterized in that the control to proceed in sequence to perform the safety stop operation. delete delete The method of claim 1,
The output unit outputs the hydraulic pressure information of the power plant turbine, characterized in that from the time when the control unit is controlled to excite the second spool of the solenoid valve including the time-dependent pressure change of the ETS flow path and the time-dependent position change of the piston. Inspection device of the actuator. The method of claim 1,
The result output to the output unit is an inspection device for a hydraulic actuator for a power plant turbine, characterized in that the information on whether the piston descends during the emergency stop operation and whether the entry flow path of the FAS flow rate is blocked. A main body on which the piston is movable up and down, a servo valve, a solenoid valve, and a shut-off valve installed on the main body, and a bottom surface of a space in which the FAS flow rate is accommodated at the bottom of the piston In the inspection method of the hydraulic actuator in which the flow path of the ETS flow rate to support is formed along the main body and the servo valve, the solenoid valve, the shutoff valve,
(a) providing a FAS flow rate for supporting a lower end of the piston and an ETS flow rate for supporting a bottom of a space in which the FAS flow rate is received below the piston;
(b) an elevating step of raising and lowering the piston sequentially by controlling the FAS flow rate using the servovalve;
(c) an emergency stop operation step of exciting the second spool of the solenoid valve to block the path where the flow of ETS flows to the lower side of the piston to rapidly lower the piston;
(d) a safety stop operation step of blocking an input signal provided to the servovalve and moving the first spool of the servovalve by a restoring force of an elastic body provided at one side to drain the FAS flow rate below the piston;
(e) detecting operation information including flow rate information of the hydraulic actuator, hydraulic information and lifting position information of the piston through a plurality of sensors while steps (a) to (d) are sequentially performed; ; And,
(f) transmitting the operation information sensed by the plurality of sensors to a control unit. The method of claim 6,
and (g) outputting a result of processing the operation information transmitted to the control unit to a user. delete The method of claim 7, wherein
In the step (g), the control unit outputs information including an hourly pressure change of the ETS flow path and an hourly position change of the piston from a time point at which the control unit controls the second spool of the solenoid valve to be excited. Method of inspecting hydraulic actuators for power plant turbines. The method of claim 7, wherein
The step (g) includes outputting information on whether the piston descends during the emergency stop operation, and information on whether the entry flow path of the FAS flow rate is blocked, and outputting the hydraulic actuator for the power plant turbine. .

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