KR20170079595A - Apparatus and methods for measuring the times involved operating in motor operated valve - Google Patents

Abstract

According to the present invention, there is provided an apparatus for measuring the operating time of a motor drive valve, comprising: an operating unit for operating whether or not a current switch is energized; and an indicator for indicating the state of the valve in accordance with energization of the current switch, A sensing unit for amplifying a current passed through the operating unit by the current switch and detecting a signal value exceeding a set value in the amplification value; And a timer unit for counting the operation time using the timer.
According to the present invention, it is possible to provide an apparatus and method for measuring the operation time of a motor drive valve for confirming an accurate operation time in measuring an operation time of a nuclear safety grade motor drive valve.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus and method for measuring the operating time of a motor drive valve,

The present invention relates to an apparatus and method for measuring the operating time of a motor-operated valve, and more particularly, to an apparatus and method for accurately measuring the operating time of a motor-operated valve, And more particularly, to an apparatus and method for measuring the operating time of a motor-operated valve.

In general, valves are used to open and close the flow and control the flow in the pipe, and various kinds of valves are installed in the power plant to block or control the flow of the fluid such as water and air. The valves must also be operated to meet the grid performance requirements for each requirement.

Among them, a motor operated valve (MOV) is composed of an electric motor and a driver, which is a gear bundle, and rotates the gear of the actuator with a motor, which is a power source, to open and close the valve.

Motor-driven valves are also used to change the opening of process-based mechanical valves or to operate ventilation system dampers. Among them, nuclear safety grade electric valves must be accurately opened and closed at a predetermined reference time, so it is most important to accurately measure the operation time.

On the other hand, safe operation of power plants and meeting regulatory requirements are fundamental to health promotion and safety protection of the general public. The verification of the equipment at the power plant is intended to demonstrate that the safety related system and equipment can perform the given functions during normal operation or in a crisis such as an earthquake. Verification of the performance of valves related to the safety of nuclear power plants is also important. It corresponds to the verification index.

The physical quantities of the motor drive valve motor speed and torque are also important performance verification factors, but the precisely measured operating time plays a particularly important role in the operation and safety of the power plant.

Therefore, it is necessary to accurately measure the operating time of the motor drive valve.

On the other hand, Korean Patent No. 1312564 (Prior Art 1) discloses a method for measuring the operating time of a motor-operated valve, Discloses a motorized valve control system including a user terminal that receives an operation log from a valve.

Another conventional technique for measuring the operating time of a motor-operated valve is to apply a load to the shaft, such as when there is a flow in the presence of a valve in the field, to determine the torque current And voltage, operating time, and the like, and controlling these values.

However, the apparatus and method for measuring the operating time of the motor drive valve have the following problems.

Motor-operated valves are mainly used for heavy-duty valves that are difficult to open and close manually, and are installed in places that are difficult for human access or dangerous. Normally, the operating time is controlled by a switchboard, It is difficult to guarantee the accurate operation time because it uses mutual communication and man-made measurement method using a stopwatch.

In addition, since the operation time of the motor-operated valve was manually checked beforehand, the operation time was measured. Therefore, it was installed in a place which is not easy to access and troublesome manpower.

In addition, there has been a problem in that when employing a method of measuring the operation time manually, the improvement of the reliability is inevitably limited.

The performance evaluation test against design basis accidents is very narrow because it requires precise measurement of operation time as a performance test evaluation, not only when a design basis accident occurs, but also when the motor drive valve is in operation.

As described above, the conventional method of measuring the operating time of the power-driven motor has been limited to improve the safety and reliability of the power-driven motor and further the nuclear power plant. In view of such a problem, Applicant has devised an apparatus and method for measuring the operating time of a motor-operated valve so as to accurately measure the operating time of the motor-operated valve.

Korean Patent Registration No. 1312564 (2013.09.30) Korean Patent Registration No. 0963283 (June 4, 2010)

It is an object of the present invention to accurately measure the operation time of a nuclear safety grade motor drive valve in order to solve all of the problems of the related art.

It is another object of the present invention to provide an apparatus and method for measuring the operating time of a motor-operated valve for confirming whether a nuclear safety grade motor-operated valve satisfies safe operation and regulatory requirements of a prescribed power plant.

Still another object of the present invention is to measure the operation time automatically and shorten the management time and manpower when the motor drive valve operates.

In order to achieve the above object, an apparatus for measuring the operating time of a motor-operated valve according to an embodiment of the present invention is an apparatus for measuring the operating time of a motor-operated valve used in a nuclear power plant, An operation part for displaying the state of the valve as an indicator in accordance with the energization of the imaginary phase current switch and for driving the motor drive valve according to whether or not the current is energized and a control part for amplifying the current energized to the operation part by the current switch, And a timer unit for counting an operation time using a frequency divider according to the signal value detected by the detection unit.

Further, an apparatus for measuring the operating time of a motor-operated valve according to an embodiment of the present invention is an apparatus for measuring the operating time of a motor-operated valve installed in parallel with a motor-operated valve, wherein the operating unit comprises a current switch for current opening and closing A contactless relay for determining whether the motor drive valve is operated, and a current transformer for generating a current in the coil of the electromagnetic contactor in operation of the motor drive valve, And a comparator for comparing the signal value with a minimum operation current set value of the electromagnetic contactor coil. The timer receives the signal value as a timer operation signal, And a 7-segment display device for displaying the counted time through a display window And the one that features.

The method for measuring the operating time of a motor-operated valve used in a nuclear power plant includes the steps of: (a) flowing an electric current by switching; (b) (C) a step of amplifying the current in the step (b) and outputting the amplified current value to the motor drive valve when the current is supplied in the step (a) And a counting step of counting an operation time according to the analysis value of the step (c) and visualizing the operation time. The method according to claim 1, further comprising: .

According to the present invention, the following effects are expected.

First, by measuring the operation time of the nuclear safety grade motor drive valve by the apparatus and the method, compared to the method in which the previous worker directly measures using the stopwatch, etc., it can contribute to reduce the measurement error of the operation time by reducing the human error.

Second, it is possible to accurately determine whether the operation within the prescribed reference operation time is completed, and the risk of safety accidents in a nuclear power plant can be minimized.

Third, it is possible to accurately measure the stroke time of the motor drive valve itself except the delay time by using the recorder instead of the stopwatch by the operator, thereby ensuring the accuracy and reliability of the data.

Fourth, errors due to external factors affecting the operation time measurement result can be minimized.

Fifth, as in the case where the operation time measuring device of the motor drive valve (MOV) is connected in parallel with the motor drive valve to control the operation in the central control room (MCR), the operation time measuring device of the motor drive valve ) Can be opened and closed.

Sixth, there is an advantage that the operation time can be automatically measured when the motor operated valve is operated, and the management time and manpower can be shortened.

1 is a view showing an operation state of a motor drive valve.
2 is a view showing an embodiment of an operation time measuring circuit for a motor drive valve according to an embodiment of the present invention.
FIG. 3 is a block diagram showing the operation time measuring method of the motor-operated valve according to the embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to or limited by the exemplary embodiments. Like reference numerals in the drawings denote members performing substantially the same function.

The specific structure or functional description presented in the embodiment of the present invention is merely illustrative for the purpose of illustrating an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention can be implemented in various forms. And should not be construed as limited to the embodiments described herein, but should be understood to include all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

1 is a view showing an operating state of a motor operated valve (MOV). As illustrated in FIG. 2, when the operator presses the operation button, the limit B contact of the motor drive valve (MOV) passes through the central control room (MCR, Main Control Room) and the breaker terminal block Then, the electromagnetic contactor of the breaker terminal block (MCC) is operated again.

When the current flows to the electronic contactor and the motor drive valve (MOV) is driven and the stroke is completed, the limit A contact is attached and the stop is made in the central control room (MCR) after passing through the breaker end material (MCC).

2 is a diagram showing an embodiment of an operation time measuring circuit of a motor drive valve (MOV) according to an embodiment of the present invention. 2, an operation time measuring device 1 (hereinafter referred to as? Measuring device) of a motor drive valve (MOV) measures the operation time of a motor drive valve (MOV) used in a nuclear power plant .

The measuring apparatus 1 includes an operating unit 10, an operating unit 20, a sensing unit 30, and a timer unit 40. [ The measuring device 1 may also be connected in parallel to a limit switch or a motor control center (MCC) in a motor drive valve (MOV) in the nuclear power plant of Fig. The measuring apparatus 1 is connected in parallel to the connection of the motor drive valve MOV of FIG. 1 to enable control of the motor drive valve MOV as well as control by the central control room MCR. This makes it possible to reestablish the stroke of the motor drive valve (MOV) within the defined reference operation time and to obtain the operation time value of the reliable motor drive valve (MOV) in the measurement.

In this case, the motor drive valve (MOV) is composed of a motor and a gear. When the motor is driven, the valve is opened and closed by a gear, and the operation can be controlled by the limit switch and the torque switch.

The limit switch is a switch that limits the stroke range of the valve. It is a device that controls the valve to be stopped by an electric signal at full opening, closing, or a certain intermediate opening degree of the valve. A separate torque switch is a device that cuts off the power to the motor when the driving force exceeds the set value due to some cause during opening and closing of the valve.

The operation unit 10 includes a current switch 110. The operation unit 10 can serve as switching for operating whether the current switch 110 is energized or not.

The operation unit 20 may include a display lamp 210, a contactless relay 220, and a current transformer 230. The operation unit 20 can display the valve state as an indicator in response to the current flow through the current switch 110 and drive the motor drive valve MOV according to whether the current switch 110 is energized or not.

The display lamp 210 can display the state of the valve due to the energization of the current switch 110. The display lamp 210 can use a low power high brightness light emitting diode (LED) in each of the energized and deactivated states capable of displaying the energization state of the current switch 110. By using low-power LEDs, it consumes less power and can be used semi-permanently without worrying about remaining power.

The contactless relay 220 senses the current applied from the operation unit 10 and discriminates whether the operation of the measurement apparatus 1 is performed or not. The contactless relay 220 can determine whether or not the motor drive valve (MOV) is operating.

The non-contact type relay 220 is a type of a stationary relay that performs an On / Off operation when the input current or voltage becomes a certain constant value or operates for a limited time under a predetermined condition. The contactless relay 220 may be capable of opening and closing other circuits when the input reaches a certain value.

The current transformer 230 may serve to energize the current to the motor drive valve MOV. When the control power of 110 VAC is applied through the non-contact type relay 220 of the operating unit 10 and the operating unit 20, the current transformer 230 outputs a current of 110 VAC to the electromagnetic contactor coil on the motor drive valve MOV side And the like.

The sensing unit 30 may include an amplifier 310 and a comparator 320. In this case, the sensing unit 30 can amplify the current in the energized state identified by the operation unit 20, particularly the current transformer 230, and detect the signal value exceeding the set value among the amplified values.

The amplifier 310 can serve to amplify the current value with the signal value so as to be comparable to the set value.

The comparator 320 may determine whether the signal device exceeds the set value, and transmit the signal value after discrimination.

More specifically, the comparator 320 sends a high (Hi) signal to the timer section 40 when the signal value exceeds the minimum operating current set value of the electromagnetic contactor coil of the motor drive valve MOV. If the signal value is below the set value , And send a low signal.

When the limit switch or the torque switch of the motor drive valve MOV operates, the closed circuit for operating the electromagnetic contactor is opened and the current transformer 230 outputs a signal corresponding to 0A to the sensing unit 30, In this case, the comparator 320 outputs a low signal to the timer unit 40 because there is no comparison signal itself.

The timer unit 40 may include a frequency divider 410 and a 7-segment display device 420. The timer unit 40 may serve to count the operation time using the frequency divider 410 according to the detected signal value.

The frequency divider 410 receives the high (Hi) signal of the detected signal value, and can measure the operation time with one minute being 60 minutes. If a low signal is detected on the way, it is possible to stop the counting by sensing the stopping time of measurement.

The 7-segment display device 420 can digitally display the operating time of the motor drive valve (MOV) counted by the divider 410.

In this case, the divider 410 receives a high (Hi) signal that can be counted, and when the pulse wave occurs in the oscillation circuit, the frequency divider 410 accurately counts in units of one second using the frequency divider circuit, It is possible to visually show that the stroke time (in seconds) of the motor drive valve MOV increases.

That is, the divider 410 counts when the signal value exceeds the set value in the comparator 320 and determines that the comparator 320 is in the operating state. When the comparator 320 opens the lead below the set value and determines that the signal value is in the stopped state, (Operation time) of the MOV.

The 7-segment display device is configured such that the 7-segment display device starts counting with a Hi signal and outputs a series of times until the counting is stopped by a Low signal, It can be displayed by the stroke time.

Also, the timer section 40 may include a reset button so that the timer section 40 is reset to the state before the stroke time and is initialized. If the reset button is pressed to return to the state before the stroke time, the display screen of the 7-segment display device 420 can be initialized to 0 seconds.

As described above, the measuring device 1 according to the embodiment of the present invention can accurately measure only the stroke time of the motor drive valve itself except the delay time by using a recorder instead of the stopwatch by the operator, You can contribute.

FIG. 3 is a block diagram showing, in steps, a method for measuring the operation time of the motor drive valve MOV according to an embodiment of the present invention. As illustrated in FIG. 3, a method S1 of measuring the operating time of the motor drive valve (MOV) (hereinafter referred to as? Measuring method?) Is as follows.

First, an indicator 210 indicating whether the motor drive valve MOV is operated or not is displayed.

Subsequently, a current is flowed by switching (S10)

When the current is supplied in step S10, the current is supplied to the motor drive valve (MOV)

At this time, it amplifies the current in step S20 and analyzes whether the amplified current value exceeds a predetermined set value, and sends out an arbitrary analysis value. (S30)

Then, the operation time is counted according to the analysis value of step S30, and the operation time is visualized (S40)

In this case, in operation S10, a current is supplied to the current switch 110 by switching.

In this case, step S20 is a step of displaying a valve state by a notification device such as the indicator lamp 210, sending the current applied in step S10 to the contactless relay 220, Energize current with motor drive valve (MOV).

A notification device such as the display light 210 is a device for notifying the operator of the fact that current is supplied to the current switch 110 by the visual, audible, tactile, or the like. Preferably, the display light 210, And may be, but is not limited to, hearing if at a distance.

In this case, step S30 amplifies the current sensed by the current transformer 230 in step S20 with a signal value by the amplifier 310, determines whether the signal value exceeds the set value, and outputs an arbitrary signal according to the detected value .

In this case, operation S40 counts the operation time according to the detected signal value, and displays the operation time on the display window of the 7-segment display device 420. [

The details of the steps S30 and S40 of the measuring method S1 according to the present invention are as follows.

After step S20, when the signal value exceeds the set value, a Hi signal is outputted. When the signal value is lower than the set value, a low signal is outputted.

After the step 30, a series of times is counted by the Hi signal to indicate that the counting is stopped by the Low signal. The series of times is displayed as the stroke time of the motor drive valve MOV. Segment display device 420 and displays them on the display window of the 7-segment display device 420. [

As described above, the operation time measuring device 1 of the motor drive valve (MOV) according to the present embodiment provides a measuring device for measuring an accurate operating time. Such a measuring apparatus 1 is intended to reduce the measurement error of the operation time and shorten the management time and manpower. The measuring device 1 according to the present embodiment can accurately measure only the stroke time of the motor drive valve itself except for the delay time due to the human error by using the recorder rather than using the stopwatch by the operator, This can contribute to ensuring the accuracy and reliability of the data.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. will be. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by all changes or modifications derived from the scope of the appended claims and equivalents of the following claims.

1: Operation time measuring device of motor drive valve
10: Operation part 110: Current switch
20: operating part 210: indicator lamp
220: Non-contact relay 230: Current transformer
30: sensing unit 310: amplifier
320: comparator
40: Timer unit 410: Divider
420: 7 segment display
S1: How to measure the operating time of the motor-operated valve
S10: Operation step
S20: Operation step
S30: Detection step
S40: Count step

Claims (9)

An apparatus for measuring the operating time of a motor-operated valve used in a nuclear power plant,
An operation unit for operating whether or not the current switch is energized;
An operation part for displaying the valve state as an indicator according to energization of the current switch and driving the motor drive valve according to the energization;
A sensing unit for amplifying a current passed through the operation unit due to the current switch and detecting a signal value exceeding the set value at the amplification value; And
And a timer for counting an operation time using a frequency divider according to the signal value detected by the sensing unit.
The method according to claim 1,
Wherein,
A contactless relay for sensing a current applied from the operation unit and discriminating whether an operation is performed or not; And
And a current transformer for passing current through the motor drive valve.
The method according to claim 1,
The sensing unit,
An amplifier for amplifying the current value to a signal value so as to be comparable to a set value; And
And a comparator for determining whether the signal device exceeds a set value and sending each signal.
The method of claim 3,
The comparator comprising:
When the signal value exceeds a set value, sends a high signal to the timer section,
And sends a low signal when the signal value is lower than a set value.
The method according to claim 1,
The timer unit,
A frequency divider for receiving the high signal of the detected signal value and measuring the operation time by taking 60 minutes for 1 minute and stopping the counting when the low signal is detected,
Segment display device for digitally displaying the operating time of the motor-operated valve.
An apparatus for measuring the operating time of a motor-operated valve, which is installed in parallel with a motor-operated valve,
The operating section is constituted by a current switch for current opening and closing,
Wherein the operation unit comprises a non-contact type relay for discriminating whether or not the motor drive valve is operated, and a current transformer for generating a current in the coil of the electromagnetic contactor in the operation of the motor drive valve,
The sensing unit may include an amplifier for amplifying a current value detected by the current transformer with a signal value and a comparator for comparing the signal value with a minimum operating current set value of the electromagnetic contactor coil,
Wherein the timer section comprises a 7-segment display device for displaying the frequency divider for counting time by receiving the signal value as a timer operation signal and the counted time through a display window.

A method for measuring an operating time of a motor-operated valve used in a nuclear power plant,
(a) an operating step of flowing current by switching;
(b) when the current is energized in the step (a), notifying the current energization state and flowing the current to the motor drive valve;
(c) amplifying the current in the step (b), analyzing whether the amplified current value exceeds a preset value, and outputting an arbitrary analysis value;
(d) counting the operating time according to the analysis value of the step (c), and visualizing the operating time.
8. The method of claim 7,
The step of outputting the arbitrary signal includes:
And outputting a high signal when the signal value exceeds the set value and outputting a low signal when the signal value is lower than the set value.
9. The method of claim 8,
The step of displaying the operation time on the 7-segment display window includes:
A counted time is counted by receiving the high signal, and a series of times until counting is stopped by the low signal is displayed as a stroke time of the motor drive valve, Of the motor-operated valve (1).

Images