KR102135793B1 - Duplex turbine trip system - Google Patents

Abstract

A trip system according to the present invention includes: a solenoid unit provided with a plurality of solenoid valves each independently switched to open or close; a control unit provided with a plurality of logic valves and connected to a trip valve that determines whether to stop a turbine according to the moving direction of working fluid passing through the solenoid unit; a switch unit for moving the working fluid to the solenoid unit or the control unit; and a first line providing a path through which the working fluid passing through the solenoid unit moves in the direction of the control unit.

Description

Duplex turbine trip system{Duplex turbine trip system}

The present invention relates to a duplex type turbine trip system, and more particularly, to a duplex type turbine trip system in a turbine trip system formed to rapidly block steam flowing into a high pressure turbine during an emergency between turbine operations.

Turbine generator is a device that performs the function of sequentially converting the thermal energy of steam into mechanical energy and electrical energy. In general, the turbine control system enables the turbine generator to safely operate under normal, transient, emergency, and malfunction conditions. It is monitored and protected by.

In addition, the control system includes multiple mechanical and electrical trip devices to prevent excessive speed of the turbine generator, and additional manual trip devices are provided to prevent damage to the turbine generator.

The steam flowing from the steam generator passes through a plurality of turbine stop valves and turbine control valves and is exhausted to a high pressure turbine, and the turbine stop valve rapidly blocks steam entering the high pressure turbine in an emergency, and the turbine control valve controls turbine speed. For this, it performs the function of properly controlling or blocking the steam flow rate.

In this regard, various types of trip systems have been introduced, but the circuit diagrams for implementing a 2 Out Of 2 or 2 Out Of 3 type trip system generally used among trip systems are complicated, and each of them is implemented to implement the circuit diagram. Multiple components that perform different functions are required.

In addition, at the same time as the turbine operation, the trip system must maintain control at all times and operate on the intermittent trip signal. However, due to the nature of multiplexing due to the fastening of the valve in the state of long-term system maintenance, a failure occurs in any one unit and the trip does not occur due to an OFF failure in the normal trip signal, which can cause fatal damage to the turbine.

Republic of Korea Registered Patent Publication No. 10-1982-0002170

The present invention is to provide a duplex-type turbine trip system as an invention devised to solve the problems of the prior art described above.

In addition, it is to provide a maintenance method using the trip system.

The problems of the present invention are not limited to the problems mentioned above, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

The trip system of the present invention for achieving the above object is a solenoid unit provided with a plurality of solenoid valves, each independently switched to an open or non-excited (close), the flow of the working fluid via the solenoid unit It is provided with a plurality of logic valves for controlling, a control unit connected to a trip valve for determining whether to stop the turbine according to the flow direction of the working fluid, a switch unit for flowing the working fluid to the solenoid unit or the control unit And a first line providing a path through which the working fluid passing through the solenoid unit flows in the direction of the control unit.

At this time, the control unit may be characterized in that to stop the turbine when the working fluid flows in the direction of the solenoid unit from at least one of a plurality of logic valves connected to the trip valve.

Alternatively, the switch unit, a direction change valve for determining the flow direction of the working fluid so that the working fluid flows in the direction of the solenoid unit or the control unit, providing a path for the working fluid to flow to the solenoid unit It may include a main line and an auxiliary line providing a path through which the working fluid flows to the control unit.

At this time, the control unit, the first logic valve for controlling the flow of the working fluid passing through the solenoid unit, extending from the first line to provide a path for the working fluid to flow to the first logic valve A second line, a third line branched from the first line or the second line to provide a flow path of the working fluid, and a third line branched from the third line and connected to a first logic valve connected to the second line It may include a first stage control unit in which four lines are formed.

At this time, the third line may include a check valve so that the flow direction of the working fluid flowing through the third line is made in one direction.

Alternatively, the first stage control unit may be characterized in that the working fluid passing through the first stage control unit is connected to the trip valve.

At this time, the auxiliary line, it may be characterized in that connecting the directional valve and the first logic valve.

And the first stage control unit is branched from the first line or the second line, connects each of the first logic valve and the two solenoid valves, and each of the solenoid valves and the two first logics A bypass line connecting the valve may be included.

At this time, the control unit, a plurality of second logic valves for controlling the flow of the working fluid through the first stage control unit, extending from the third line, the path through which the working fluid flows to the second logic valve A fifth line providing a, a sixth line branching from the third line or the fifth line to provide a flow path of the working fluid, and a seventh line branching from the sixth line and connected to the second logic valve It may include a second stage control unit is formed.

At this time, the second stage control unit may be characterized in that the working fluid passing through the second stage control unit is connected to the trip valve.

At this time, the auxiliary line, it may be characterized in that the connecting the direction switch valve and the second logic valve.

The turbine trip system of the present invention for solving the above problems has the following effects.

First, first, even if some of the multiple solenoid valves do not work, the turbine can be stopped immediately.

Second, preventive maintenance is possible during operation of at least some of the plurality of solenoid valves.

Third, manufacturing and maintenance are advantageous by unifying components compared to the prior art.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 to 3 are views showing a trip process and a maintenance method according to a circuit diagram of 1 Out Of 2 to which the duplex type turbine trip system of the present invention is applied.
4 to 6 are views showing a trip process and a maintenance method according to a circuit diagram of 2 Out Of 2 to which the duplex type turbine trip system of the present invention is applied.
And Figure 7 is a diagram showing a circuit diagram of 2 Out Of 3 to which the duplex type turbine trip system of the present invention is applied.

Hereinafter, preferred embodiments of the present invention, in which the object of the present invention can be specifically realized, will be described with reference to the accompanying drawings. In describing the present embodiment, the same name and the same code are used for the same configuration, and additional description will be omitted.

In addition, in describing the embodiments of the present invention, it is revealed in advance that components having the same function use the same name and the same reference numerals and are not substantially identical to the conventional ones.

In addition, the terms used in the embodiments of the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In addition, in the embodiments of the present invention, terms such as "comprises" or "have" are intended to indicate that there are features, numbers, steps, operations, components, parts, or a combination thereof described in the specification, but one Or further features or numbers, steps, actions, components, parts, or combinations thereof, should not be excluded in advance.

In addition, the configuration of the present invention to be described below may be formed symmetrically due to the characteristics of the invention, and a part of the symmetrical configuration will be described. It is apparent to those skilled in the art that the symmetrical configuration of the described configuration can also be understood as the same or similar configuration that implements the same or similar functions.

The duplex trip system of the present invention may include a solenoid unit 100, a control unit 300, a switch unit 200 and a first line 510.

The solenoid unit 100 is provided with a plurality of solenoid valves 110 each of which is independently switched to open or non-excited (close).

That is, the solenoid valve 110 is configured to switch to excitation or non-excitation according to signal generation, and is characterized in that a stop signal of a turbine is generated from a control system or is switched from an excitation state to an unexcited state as power is lost. Can be done with The signal can be understood as a signal related to the emergency stop of the turbine, and the solenoid valve 110 is in an excited state when in a normal operation state, and when the signal occurs, the solenoid valve 110 is switched to a non-excited state. Can.

The solenoid valve 110 may be a method in which the solenoid is operated by moving the valve to change direction when a specific electric signal is input by providing an electric operation to the solenoid. In addition, a plurality of solenoid valves 110 constituting the solenoid unit 100 may be provided according to the operating conditions of the turbine.

At this time, the solenoid unit 100 may include a drain line 130 that provides a path through which the working fluid is discharged. The drain line 130 is configured to provide a path through which the working fluid is discharged when the solenoid valve 110 is switched to a non-excited state, and is preferably formed to be connected to the solenoid valve 110. The flow of the working fluid in this regard will be described below.

The control unit 300 is provided with a plurality of logic valves, and may be connected to a trip valve 700 that determines whether to stop the turbine according to the flow direction of the working fluid passing through the solenoid unit 100.

The logic valve is a configuration that can control the flow of the working fluid through the solenoid unit 100 to participate in the movement of the turbine, and the operation or emergency of the turbine through control related to the flow direction or flow of the working fluid Stop and the like can be controlled.

The trip valve 700 is not limited to the configuration as long as it can determine whether or not the turbine is emergency in connection with the solenoid unit 100 or the control unit 300.

At this time, the control unit 300, to stop the turbine when the working fluid flows in the direction of the solenoid unit 100 from at least one of a plurality of logic valves connected to the trip valve 700 It can be characterized by.

That is, when the working fluid flows in the direction of the solenoid unit 100 with respect to the logic valve connected to the trip valve 700 among the plurality of logic valves constituting the control unit 300 to the trip valve 700 No working fluid is introduced.

Accordingly, in the case of the duplex type turbine trip system of the present invention, when a problem occurs with any one of the solenoid valves 110 among the plurality of solenoid valves 110, the turbine trip system can be immediately activated.

The switch unit 200 may flow the working fluid to the solenoid unit 100 or the control unit 300.

At this time, the switch unit 200, it is preferable that it is disposed in the front end of the solenoid unit 100 in the direction in which the working fluid flows. However, this is for simply decorating the circuit diagram of the trip system of the present invention and is not limited thereto.

As the working fluid flows to the solenoid unit 100 or the control unit 300 by the switch unit 200, it is possible to operate the trip system or to maintain the solenoid valve 110.

That is, when the working fluid flows to the solenoid unit 100, it is possible to determine whether to stop the turbine in conjunction with the control unit 300. In addition, when the working fluid bypasses the solenoid unit 100 and flows to the control unit 300, replacement or maintenance of the solenoid unit 100 may be performed.

Specifically, the switch unit 200 may include a direction change valve 210, a main line 230, and an auxiliary line 250.

The direction change valve 210 may determine a flow direction of the working fluid such that the working fluid flows in the direction of the solenoid unit 100 or the control unit 300. The working fluid passing through the switch unit 200 by the direction changing valve 210 flows in the direction of the solenoid unit 100 along the main line 230 to be described later, or along the auxiliary line 250 By bypassing the solenoid unit 100 may flow in the direction of the control unit 300.

The main line 230 may provide a path through which the working fluid flows to the solenoid unit 100. That is, the main line 230 is a path connecting the switch unit 200 and the solenoid unit 100, and the working fluid by the main line 230 passes through the switch unit 200. It can flow to the solenoid unit 100.

In addition, the auxiliary line 250 may provide a path through which the working fluid flows to the control unit 300. That is, the auxiliary line 250 is a path connecting the switch unit 200 and the control unit 300, and the working fluid by the auxiliary line 250 passes through the switch unit 200. It can flow directly to the control unit 300.

Accordingly, the direction change valve 210 may be operated so that the working fluid is generally passed along the main line 230 during operation or trip of the turbine. In addition, when the preventive maintenance of the solenoid valve 110 is required, the working fluid may operate the direction changing valve 210 so as to pass along the auxiliary line 250.

The first line 510 may provide a path through which the working fluid passing through the solenoid unit 100 flows in the direction of the control unit 300. Accordingly, the working fluid may flow through the main line 230 by the switch unit 200, pass through the solenoid unit 100, and then flow along the first line 510.

In addition, the first line 510 is a path through which the working fluid flows in the direction of the control unit 300 via the solenoid unit 100, and at the same time through the control unit 300. It may be a path that flows in the direction of the solenoid unit 100.

The 1 Out Of 2 trip system of the present invention will be described with reference to FIGS. 1 to 3. 1 to 3 are diagrams showing a trip process and a maintenance method according to a circuit diagram (hereinafter referred to as a first embodiment) of 1 Out Of 2 to which the duplex type turbine trip system of the present invention is applied.

According to the first embodiment of the present invention, the control unit 300 may include a first stage control unit 310. In addition, the first stage control unit 310 may include a first logic valve 313, a second line 520, a third line 530, and a fourth line 540.

A plurality of the first logic valves 313 may be provided to control the flow of the working fluid passing through the solenoid unit 100. That is, the first logic valve 313 may be understood as a logic valve provided in the first stage control unit 310. In addition, the plurality of logic valves is preferably provided in a number corresponding to the plurality of solenoid valve 110. For example, when the solenoid valve 110 is composed of two or three, the logic valve may also be composed of two or three, respectively. However, the present invention is not limited thereto, and may be appropriately selected according to the operating conditions of the turbine.

The second line 520 may extend from the first line 510 to provide a path through which the working fluid flows to the logic valve.

The third line 530 may branch from the first line 510 or the second line 520 to provide a flow path of the working fluid. At this time, the third line 530 may be provided with a check valve 535 so that the flow direction of the working fluid flowing through the third line 530 is made in one direction.

In the first stage control unit 310, an operating fluid passing through the first stage control unit 310 may be connected to the trip valve 700 by the third line 530. For example, when the solenoid valve 110 is in an excited state, the working fluid flows in the direction of the trip valve 700 by sequentially passing through the first line 510 and the third line 530. can do. That is, the third line 530 may be formed to connect the first stage control unit 310 and the trip valve 700.

The fourth line 540 may be connected to a logic valve branched from the third line 530 and connected to the second line 520.

According to the turbine trip system of the first embodiment, the first stage control unit 310 may be characterized in that the working fluid passing through the first stage control unit 310 is connected to the trip valve 700. That is, in the first embodiment, the third line 530 described above may be connected to the trip valve 700.

Looking at the driving of the first embodiment of the present invention according to the above configuration is as follows.

As in FIG. 1, when the solenoid valve 110 is in an excited state, the working fluid flows along the main line 230 by the redirection valve 210 and then moves the solenoid valve 110. Can go through. Thereafter, the working fluid may flow through the first line 510 to the second line 520, the third line 530, and the fourth line 540. However, the working fluid flowing in the second line 520 or the fourth line 540 may be blocked without passing through the first logic valve 313. And the working fluid flowing to the third line 530 flows into the trip valve 700 so that the turbine can be operated normally.

However, the working fluid flowing along the second line 520 and the fourth line 540 does not pass through the first logic valve 313. Specifically, the first logic valve 313 is formed so that the working fluid can flow only in the direction of the second line 520 from the fourth line 540, the working fluid flowing in the second line 520 May not pass through the first logic valve 313.

The bypass line 580 is always pushed with a large force due to the difference in force when pressure is generated at the same time as the internal pilot line communicating with the bypass line 580 and the fourth line 540 operating the logic valve 313. When there is a flow of the fourth line 540 when the pressure of the line 580 is lost, the flow from the fourth line 540 to the second line 520 is made by connecting to the second line 520 by an internal pilot. It becomes possible.

And, as shown in FIG. 2, even if a problem occurs due to the fixation of the solenoid valve 110 by inputting a signal related to the emergency stop of the turbine to the solenoid valve 110, even one solenoid valve 110 is switched to the non-excited state. If possible, the working fluid flowing to the trip valve 700 is sequentially the fourth line 540, the first logic valve 313, the second line 520 and the first line 510 After passing through, it may be discharged to the tank or the like through the drain line 130.

At this time, some of the working fluid may be blocked by a check valve 535 provided in the third line 530. That is, when the solenoid valve 110 is in an excited state by the check valve 535, the working fluid flows from the solenoid unit 100 to the trip valve 700 through the control unit 300. However, when the solenoid valve 110 is in the non-excited state, the flow in the reverse direction may be blocked.

In addition, as shown in FIG. 3, when replacement or maintenance of the solenoid valve is required, the working fluid is provided through a direction switching valve 210 formed on a solenoid valve 110 that requires replacement or maintenance of the valve. It can be made to flow to the auxiliary line 250.

That is, in the first embodiment, the auxiliary line 250 may connect the direction change valve 210 and the first logic valve 313. A part of the first logic valve 313 is operated by the working fluid flowing to the auxiliary line 250, and the working fluid passing through the fourth line 540, the first logic valve 313 It may not be able to connect to the second line 520 through. Thereafter, the working fluid in the second line 520 may be discharged through the drain line 130 provided in the solenoid unit 100. When all of the working fluid is discharged through the drain line 130, replacement or maintenance of some solenoid valves may be performed.

The 2 Out Of 2 trip system of the present invention will be described with reference to FIGS. 4 to 6. 4 to 6 are diagrams showing a tripping process and a maintenance method according to a circuit diagram (hereinafter referred to as a second embodiment) of 2 Out Of 2 to which the duplex turbine trip system of the present invention is applied.

According to the second embodiment of the present invention, the control unit 300 may include a first stage control unit 310. In addition, the first stage control unit 310 may include a first logic valve 313, a second line 520, a third line 530, a fourth line 540, and a bypass line 580. .

The configuration of the first logic valve 313, the second line 520, the third line 530, and the fourth line 540 of the second embodiment of the present invention is the first logic of the first embodiment of the present invention described above. The valve 313, the second line 520, the third line 530 and the fourth line 540 may be understood as the same or similar configuration.

However, in the case of the second embodiment of the present invention, it is branched from the first line 510 or the second line 520 to connect the respective first logic valves 313 and the two solenoid valves 110 And, it may further include a bypass line 580 connecting each of the solenoid valve 110 and the two first logic valves 313.

When the number of the solenoid valve 110 and the number of the first logic valves 313 are equal to n, respectively, the number of cases where the solenoid valve 110 and the logic valve are connected by the bypass line 580 is It can be represented by nC2. The C is a meaning having calculation and properties of combination.

For example, as in the second embodiment of the present invention, when the solenoid valve 110 and the first logic valve 313 are each composed of two (a circuit diagram of 2 Out of 2 method), the solenoid valve 110 And the first logic valve 313 may be connected by a bypass line 580 in one way according to 2C2. In addition, as in the third embodiment of the present invention to be described later, when the solenoid valve 110 and the first logic valve 313 are each composed of three (2 Out of 3 circuit diagram), three according to 3C2 By way of the bypass line 580, the solenoid valve 110 and the first logic valve 313 may be connected.

That is, each of the above-described first logic valve 313 and the two solenoid valves 110 are connected, and each of the solenoid valves 110 and the two first logic valves 313 are configured to be connected. Can be understood as the number of cases connected to the bypass line 580.

In addition, according to the second embodiment, the other end of the first stage control unit 310, one end of which is connected to the solenoid unit 100, is a second stage control unit (at least part of the third line 530) 350).

At this time, the second stage control unit 350, the second logic valve 353, the fifth line 550, the sixth line 560 and the seventh line 570 may be formed.

The second logic valve 353 may control the flow of the working fluid through the first stage control unit 310.

The fifth line 550 may extend from the third line 530 to provide a path through which the working fluid flows to the second logic valve 353.

The sixth line 560 may branch from the third line 530 or the fifth line 550 to provide a flow path of the working fluid. At this time, the sixth line 560, as in the third line 530 of the first embodiment described above, the check valve so that the flow direction of the working fluid flowing through the sixth line 560 is made in one direction ( 535) may be provided.

In addition, the seventh line 570 may be branched from the sixth line 560 and connected to the second logic valve 353.

In addition, the second stage control unit 350 may be characterized in that the working fluid passing through the second stage control unit 350 is connected to the trip valve 700.

Looking at the driving of the second embodiment of the present invention according to the above configuration is as follows.

As in FIG. 4, when the solenoid valve 110 is in an excited state, the working fluid flows along the main line 230 by the redirection valve 210 and then turns the solenoid valve 110. Can go through. Thereafter, the working fluid may flow through the first line 510 to the second line 520, the third line 530, and the fourth line 540. However, the working fluid flowing in the second line 520 or the fourth line 540 may be blocked without passing through the first logic valve 313. At this time, the working fluid flowing along the third line 530 includes the fifth line 550, the sixth line 560, and the seventh line 570 of the second stage control unit 350. Can flow. However, by the second logic valve 353, the working fluid flowing to the fifth line 550 or the seventh line 570 may be blocked without passing through the second logic valve 353. . In addition, the working fluid flowing along the sixth line 560 flows into the trip valve 700 so that the turbine can operate normally.

And, as shown in FIG. 5, when a signal related to the emergency stop of the turbine is input to the solenoid valve 110, and at least one solenoid valve 110 interlocked with the direction switching valve 210 is switched to the non-excitation state. , The working fluid that flowed to the trip valve 700 flows sequentially into the seventh line 570, the second logic valve 353, the fifth line 550, and the third line 530. It may flow in the direction of the first stage control unit 310. At this time, some of the working fluid may be blocked by a check valve 535 provided in the sixth line 560. And the working fluid passes through the fourth line 540, the first logic valve 313, the second line 520, and the first line 510 sequentially, and then the drain line 130 It can be discharged to a tank or the like. At this time, some of the working fluid may be blocked by a check valve 535 provided in the third line 530.

In addition, as shown in Figure 6, when the replacement or maintenance of the solenoid valve is required, the working fluid is through the direction switching valve 210 formed on the side of the solenoid valve 110 that requires replacement or maintenance of the valve It can be made to flow to the auxiliary line 250.

At this time, the auxiliary line 250 may be characterized by connecting the direction switching valve 210 and the second logic valve 353. A part of the second logic valve 353 is operated by the working fluid flowing to the auxiliary line 250, and the working fluid passing through the fifth line 550 or the seventh line 570 is the The first logic valve 313 may not pass. Thereafter, the working fluid may be discharged through the drain line 130 provided in the solenoid unit 100 via the first stage control unit 310 in the same manner as the first embodiment described above. When all of the working fluid is discharged through the drain line 130, replacement or maintenance of some solenoid valves may be performed.

That is, in the case of the duplex trip system of the present invention, when formed in multiple stages, the auxiliary line 250 is preferably connected to a logic valve directly connected to the trip valve 700.

The logic valves and circuits constituting the second stage control unit 350 are configured in the same way as the logic valves and circuits constituting the first stage control unit 310, so that components can be unified and managed so that an administrator can install or maintain or It has the advantage of easy maintenance.

The 2 Out Of 3 trip system of the present invention will be described with reference to FIG. 7. 7 is a view showing a trip process and a maintenance method according to a circuit diagram of 2 Out Of 3 to which the duplex turbine trip system of the present invention is applied (hereinafter referred to as a third embodiment).

In the case of the third embodiment, it can be understood that the second embodiment and the number of solenoid valves 110 and logic valves to be described below and the number of bypass lines 580 are the same or similar.

That is, in the case of the third embodiment, compared with the second embodiment, three solenoid valves 110 and three logic valves of the first stage control unit 310 may be provided, and when viewed as one unit, the units are 2 When the dog is formed, the total solenoid valve 110 and the logic valves of the first stage control unit 310 may be provided six each.

In addition, the first bypass line 580 formed in the first stage control unit 310 may be formed in 3C2 or three methods according to the above-described features of the present invention.

The operation according to the flow of the other working fluid can be understood in the same or similar manner to the second embodiment described above.

As described above, according to the duplex type trip system of the present invention, it can be formed in various ways other than 1 Out of 2 in the first embodiment, 2 Out of 2 in the second embodiment, and 2 Out of 3 in the third embodiment. It is obvious to a person skilled in the art.

As described above, a preferred embodiment according to the present invention has been examined, and the fact that the present invention may be embodied in other specific forms without departing from the spirit or scope of the embodiment described above has ordinary skill in the art. It is obvious to them. Therefore, the above-described embodiments are to be regarded as illustrative rather than restrictive, and accordingly, the present invention is not limited to the above description and may be modified within the scope of the appended claims and their equivalents.

P: Pump
100: solenoid unit
110: solenoid valve
130: drain line
200: switch unit
210: directional valve
230: main line
250: auxiliary line
300: control unit
310: first stage control unit
313: first logic valve
350: second stage control unit
353: second logic valve
510: Line 1
520: Line 2
530: Line 3
535: check valve
540: line 4
550: Line 5
560: Line 6
570: Line 7
580: bypass line
700: trip valve

Claims (11)

A solenoid unit each having a plurality of solenoid valves that are independently switched to open or closed;
A control unit provided with a plurality of logic valves for controlling the flow of the working fluid through the solenoid unit, and connected to a trip valve for determining whether to stop the turbine according to the flow direction of the working fluid;
A switch unit that flows the working fluid to the solenoid unit or the control unit; And
A first line providing a path through which the working fluid passing through the solenoid unit flows in the direction of the control unit;
Including,
The switch unit,
A direction change valve for determining a flow direction of the working fluid such that the working fluid flows in the direction of the solenoid unit or the control unit;
A main line providing a path through which the working fluid flows to the solenoid unit; And
An auxiliary line providing a path through which the working fluid flows to the control unit;
Trip system comprising a. According to claim 1,
The control unit,
A trip system for stopping the turbine when the working fluid flows in the direction of the solenoid unit from at least one of a plurality of logic valves connected to the trip valve. delete According to claim 1,
The control unit,
A first logic valve for controlling the flow of the working fluid through the solenoid unit, a second line extending from the first line to provide a path for the working fluid to flow to the first logic valve, the first line or A first stage that is branched from the second line to provide a flow path of the working fluid and a fourth line that is branched from the third line and connected to a first logic valve connected to the second line Control unit;
Trip system comprising a. The method of claim 4,
The third line,
A check valve so that the flow direction of the working fluid flowing through the third line is made in one direction;
Trip system comprising a. The method of claim 4,
The first stage control unit,
A trip system, characterized in that the working fluid passing through the first stage control unit is connected to the trip valve. The method of claim 6,
The auxiliary line,
A trip system, characterized in that the direction switching valve and the first logic valve are connected. The method of claim 4,
The first stage control unit,
A bypass line branching from the first line or the second line, connecting the respective first logic valves and the two solenoid valves, and connecting the respective solenoid valves and the two first logic valves;
Trip system comprising a. The method of claim 8,
The control unit,
A plurality of second logic valves for controlling the flow of working fluid through the first stage control unit, a fifth line extending from the third line to provide a path for the working fluid to flow to the second logic valve, the A second stage control unit which is branched from the third line or the fifth line to provide a flow path of the working fluid, and a seventh line branched from the sixth line and connected to the second logic valve;
Trip system comprising a. The method of claim 9,
The second stage control unit,
A trip system characterized in that the working fluid passing through the second stage control unit is connected to the trip valve. The method of claim 10,
The auxiliary line,
A trip system, characterized in that the direction switching valve and the second logic valve are connected.

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