KR20140078938A - Speed characteristic test device of turbine and boiler feedwater pump - Google Patents

Abstract

Disclosed is a speed characteristic test device which can test the characteristic of a speed detector which measures the rotation speed of a turbine and a boiler feedwater pump. A speed characteristic test device of a turbine and a boiler feedwater pump according to the present invention includes a rotation body having a gear, a sub motor which rotates the rotation body, a fixing bracket which allows a speed detector to be fixed to the gear of the rotation body with a constant distance, an analog to digital (A/D) convertor which converts an analog signal generated by the speed detector according to the rotation speed of the rotation body into a digital voltage signal, a control part which controls the rotation of the sub motor and calculates the rotation speed of the rotation body according to the digital voltage signal, and a control motor which inputs a setting value for testing the speed detector and displays the test result of the speed detector.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a turbine and a feed pump speed detector,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed detector characteristic test apparatus, and more particularly, to an apparatus for testing the characteristics of a speed detector applied to a turbine and a feed pump.

Generally, a speed detector installed in a turbine (TBN) or a boiler feedwater pump (BFP) is a device for measuring the rotational speed of a turbine or feed pump.

The speed detector is divided into a passive type and an active type (Positive Type) which does not require external power supply depending on whether an external power source is supplied.

The speed detector measures the rotational speed of the turbine or feed pump and generates a corresponding voltage. Using the voltage generated by the speed detector, the rotational speed of the turbine or feed pump can be measured.

In order to accurately measure the characteristics of the speed detector (normal operation), it is preferable to use the rotation speed measured by the speed detector by operating the turbine or the feed pump. However, if the turbine or the feed pump is in operation, Was impossible.

Therefore, the characteristics of the speed detector were indirectly measured by stopping the operation of the turbine or feed pump and separating the speed detector from the turbine or feed pump to measure the resistance of the speed detector.

1A is a diagram showing a resistance measurement of a passive velocity detector, and FIG. 1B is a diagram showing a resistance measurement of an active velocity detector.

Referring to FIGS. 1A and 1B, in order to determine whether the speed detector operates normally, a resistance is measured using a tester.

That is, the normal operation was judged by measuring the insulation resistance between the pin and the casing of the passive type speed detector composed of two pins and the line resistance between the pins.

For example, it was judged that the passive type speed detector operates normally when the insulation resistance between each pin and the casing is 0.1 MΩ respectively and the inter-line resistance between the pins is measured at 200 KΩ.

The resistance measurement method of the active speed detector is the same as the resistance measurement method of the passive speed detector.

For example, in the case of an active type speed detector composed of 3 pins, when the line-to-line resistance between the pins is 5? And the insulation resistance of each pin and casing is measured by 0.1 M ?, respectively, .

The conventional determination method indirectly measures the characteristics of the speed detector by using a resistor, so that even if the measured value is correct, there is a problem that the speed detector does not operate normally.

That is, since the characteristics of the speed detector are conventionally measured by an indirect method instead of a direct method, there is a problem in that it is difficult to accurately determine whether the speed detector operates normally.

Since the rotational speed of the turbine or feed pump is controlled on the basis of the rotational speed measured by the speed detector, it is necessary to safely operate the turbine or feed pump only if the speed detector can measure the correct rotational speed of the turbine or feed pump It is possible.

2 is a table showing the voltage generated in the speed detector according to the revolution speed (RPM) of the turbine or feed pump.

Referring to FIG. 2, the abscissa of the table indicates the rotation speed of the turbine or the feed pump, the rotation speed recognized according to the voltage generated by the speed detector and the voltage generated by the speed detector according to the rotation speed.

The vertical axis of the table represents the rotational speed of the turbine or feed pump, the number of revolutions recognized according to the voltage generated by the speed detector and the voltage generated by the speed detector according to the rotational speed.

For example, if the speed detector is normal, and the rotational speed of the turbine or feed pump is 2000 RPM, the voltage generated by the speed detector is 12 volts (V).

However, if the voltage generated by the speed detector is 18 volts (V), the rotation speed recognized according to the voltage generated by the speed detector is recognized as 3000 RPM, so that a disturbance may occur in the control system of the turbine or the feed pump.

Therefore, it is very important that the speed detector operates correctly, and a device capable of accurately measuring the characteristics of the speed detector (normal operation status) is needed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a test apparatus for testing whether a speed detector attached to a turbine and a feed pump is operating normally.

According to the present invention, there is provided an apparatus for testing the characteristics of a turbine and a feed pump speed detector, comprising: a rotor having a toothed gear; a servo motor for rotating the rotatable shaft; An analog to digital converter for converting the analog voltage signal generated by the speed detector into a digital voltage signal in accordance with the interval between the gear of the rotating body and the speed detector and the rotational speed of the rotating body, A control unit for controlling the rotation of the servomotor and calculating a rotation speed of the rotating body in accordance with the digital voltage signal; a setting unit for inputting a setting value for testing the speed detector; And a control monitor connected to the control unit.

The turbine and feed pump speed detector characteristic testing apparatus of the present invention further includes an emergency button switch capable of stopping the test of the speed detector.

According to the above configuration, it is possible to grasp the speed detector that does not operate normally. Therefore, it is possible to prevent the malfunction of the turbine and the feed pump and the disturbance of the control system caused by the installation of the defective speed detector in the turbine and the feed pump .

The malfunction of the turbine and the feed pump and the disturbance of the control system can be prevented in advance, thereby preventing the start-up of the turbine and the feed pump from being delayed.

Since the speed detector which does not operate normally can be grasped by using the speed detector characteristic test apparatus, it is possible to stably operate the turbine and the feed pump.

The characteristic of the speed detector characteristic test apparatus is easily portable, and it is easy to move and easy to operate, which is easy for anyone to handle.

1A is a diagram showing a resistance measurement of a passive velocity detector.
Fig. 1B shows the resistance measurement of the active speed detector.
2 is a table showing the voltage generated in the speed detector according to the revolution speed (RPM) of the turbine or feed pump.
3 is an embodiment showing the concept of a velocity detector testing apparatus according to the present invention.
4 is a diagram showing a configuration of a speed detector test apparatus according to an embodiment of the present invention.
5 is a diagram showing a flow of a test method of a velocity detector test apparatus according to the present invention.
6A is a view showing an entire screen of a control monitor of the speed detector testing apparatus according to the present invention.
6B is an embodiment showing a screen for registering the specification of the speed detector through the input unit of the control monitor.
6C is a diagram showing a screen for registering the reference voltage through the control monitor.
6D is a diagram showing a screen for displaying test data of the speed detector through the control monitor.
FIG. 6E is an embodiment showing a screen for displaying the speed detector specification registered by the user.
6F is an embodiment of a table showing the output voltage of the speed detector under test.
FIG. 6G is an embodiment of a screen for graphically displaying the results for the velocity detector under test.
Figure 6h is an embodiment showing that the result graph for the speed detector under test is zoomed in.
6I is an embodiment of a screen showing a manual operation mode of the speed detector test apparatus.
6J is an embodiment of a screen showing an automatic operation mode of the speed detector test apparatus.
6K is an embodiment showing a window activated by clicking the START button in the automatic operation mode.
FIG. 61 is an embodiment showing a message screen displaying the state of the velocity detector testing apparatus.
6M is an embodiment showing a screen for selecting a power source to be supplied to the speed detector.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Wherein like reference numerals refer to like elements throughout.

3 is an embodiment showing the concept of a speed detector characteristic test apparatus according to the present invention.

3, the speed detector characteristic test apparatus 100 according to the present invention includes a control monitor 13, a control unit 11, a servo motor 2, a rotating body 1, and an A / D (Analog to Digital ) Converter 12. In this embodiment,

Through the control monitor 13, the user can input various setting values for the speed detector and display various information about the speed detector to be tested.

For example, the user can set the target speed for rotating the rotating body 1 through the control monitor 13, and can set the specification of the speed detector and the reference voltage. The reference voltage is a voltage generated by a speed detector operating normally according to the speed of the rotating body 1. [

Also, the user can set a test mode, a delay time, an up value, and a maximum speed through the control monitor 13. The test mode includes a linear mode and a step mode.

Further, in the case of testing the speed detector, the user can select the power supply to the speed detector via the control monitor 13. [ For example, when power is not supplied to the speed detector, it can be set to "No". When supplying power to the speed detector, a direct current (DC) power source of 12 volts (V) or 24 volts V).

Since the power supplied to the speed detector can be selected, it is possible to supply the power according to the speed detector specification.

The control unit 11 controls the servo motor 2 that rotates the rotating body 1 in accordance with the target speed inputted through the control monitor 13 and controls the servo motor 2 in accordance with the set value inputted through the control monitor 13. [ And controls the characteristic testing apparatus 100.

The speed detector generates a voltage signal based on the rotational speed of the rotating body 1, and the voltage signal generated by the speed detector is an analog signal.

More specifically, when the gap between the speed detector and the gear 14 changes according to the rotation of the gear 14 formed on the rotating body 1, a voltage signal corresponding to the change in the gap is generated.

That is, when the interval between the speed detector and the gear 14 is wide, the voltage generated by the speed detector is high, and conversely, when the interval is narrow, the voltage generated is low.

When the rotational speed of the rotating body 1 is high, the voltage generated by the speed detector also increases in proportion thereto. Using the principle described above, the speed detector measures the rotational speed of the rotating body 1.

The analog to digital (A / D) converter 12 converts the analog voltage signal generated by the speed detector into a digital voltage signal, and the control unit 11 grasps the rotation speed of the rotating body 1 based on the digital voltage signal .

That is, the control unit 11 calculates the rotation speed of the rotating body 1 according to the digital voltage signal converted by the A / D converter 12.

The control monitor 13 displays various information on the speed detector and may be constituted by a display device (LCD, LED, PDP, etc.). Various information displayed by the control monitor 13 will be described in detail below.

4 is a diagram showing a configuration of a speed detector test apparatus according to an embodiment of the present invention.

4, the speed detector characteristic test apparatus 100 according to the present invention includes a rotating body 1, a servo motor 2, a first fixing bracket 3, a second fixing bracket 4, A second power supply terminal 5, a second connector 6, an emergency switch 7, a power on / off switch 8, a power cable terminal 9, a power supply 10, a control unit 11, an A / D converter 12, , And a control monitor (13).

The rotating body 1 is connected to the servomotor 2 and a gear 14 is formed on the rotating body 1. [

The servomotor 2 is a driving body for rotating the rotating body 1, and generally uses an AC power source 220 volts (AC 220 V) as a power source.

Each of the first fixing bracket 3 and the second fixing bracket 4 serves to fix the speed detector at a position close to the gear 14 of the rotating body 1. [ At least one fixing bracket is used and the number of fixing brackets is not limited to two.

Depending on the number of speed detectors to be tested, the number of fixed brackets (3, 4) can also be changed.

The first connector 5 and the second connector 6 are connected to the end of a cable (not shown) connected to the respective speed detectors, and each connector 5, 6 supplies power to the speed detector.

As with the first and second fixing brackets 3 and 4, the number of the first and second connectors 5 and 6 can be changed according to the number of speed detectors to be tested.

The emergency switch 7 is operated by the speed detector characteristic testing apparatus 100 when an unexpected emergency situation occurs during the test of the speed detector (for example, the speed detector characteristic test apparatus 100 is overloaded) Can be stopped. Therefore, it is possible to quickly respond to an emergency situation through the emergency switch 7. [

The speed detector characteristic testing apparatus 100 can receive power from an external power supply unit (not shown) through the power cable terminal block 9. The power cable terminal block 9 can be connected to an external power supply through a cable.

The power supplied to the speed detector test apparatus 100 can be determined through the power on / off switch 8 whether or not the power source for driving the speed detector characteristic testing apparatus 100 is supplied.

The power supply unit 10 stably supplies power to the speed detector characteristic testing apparatus 100.

The control unit 11 drives the servo motor 2 in accordance with the input target speed and controls the speed detector characteristic testing apparatus 100 as a whole.

The A / D converter 12 converts an analog voltage signal generated by the speed detector into a digital voltage signal.

The converted digital voltage signal is received by the controller, and based on the converted digital voltage signal, the controller 11 determines the rotational speed of the rotating body 1 measured by the speed detector.

The user can input the specification and reference voltage of the speed detector through the control monitor 13, and visually displays information such as the speed detector test result to the user.

Accordingly, the user compares the previously inputted target speed with the measured rotation speed, and compares the same with each other to determine whether the speed detector is operating normally.

The storage unit (not shown) stores all the information related to the test, such as the contents of the test and the speed detector specifications through the speed detector characteristic testing apparatus 100.

The information stored in the storage unit can be confirmed by the user through the control monitor 13. [

5 is a diagram showing a flow of a test method of a velocity detector test apparatus according to the present invention.

5, a method of testing a speed detector using the apparatus 100 for testing the characteristics of a speed detector according to the present invention is as follows. First, a speed detector is mounted on a speed detector characteristic testing apparatus 100 (S1).

The gap between the rotating body 1 and the gear 14 is adjusted so that the cable is connected to the end of the speed detector and connected to the connectors 5 and 6 of the speed detector characteristic testing apparatus 100. When a plurality of speed detectors are mounted, they are mounted in the same manner as described above.

The power for driving the speed detector characteristic testing apparatus 100 is connected to the speed detector testing apparatus 100 (S2). The power supply uses AC 220V and is connected through a cable.

When the power on / off switch 8 is turned on, power is supplied to the speed detector characteristic testing apparatus 100.

Information for the speed detector test is inputted through the control monitor 13 (S3). The information includes various data as the specification of the speed detector, the target speed of the rotating body 1, and the like.

An operational mode for the speed detector test is set through the control monitor 13 (S4). The operation modes are the manual operation mode and the automatic operation mode, and the test is performed according to the setting of the mode selected by the user.

According to the test result, the user can judge whether or not the speed detector should be replaced.

When the test for the normal operation of the speed detector is completed, the result data is stored (S5). Through the stored data, it is possible for the user to check the test results for the speed detector at any time.

6A is a view showing an entire screen of a control monitor of the speed detector testing apparatus according to the present invention.

6A, the control monitor 13 includes a pull-down menu window A for registering the specifications of the speed detector and a reference voltage, a screen B for displaying test data of the speed detector, (C) showing the registered speed detector specifications, a table (D) showing the output voltage of the speed detector under test, a screen (E) showing the results of the speed detector under test as a graph, a result A screen G indicating a manual operation mode of the speed detector tester, a screen H indicating an automatic operation mode of the speed detector tester, A message screen (I) for displaying the status of the speed detector test apparatus, a screen (J) for selecting power to be supplied to the speed detector, and an emergency stop button (K).

By clicking the emergency stop button K, the user can stop the test at the occurrence of an emergency situation in the speed detector test apparatus 100, and it is possible to quickly respond to the emergency situation.

The remaining screens will be described in detail with reference to the following drawings.

FIG. 6B is a diagram illustrating a screen for registering the specification of the speed detector through the input unit of the control monitor, and FIG. 6C is a diagram illustrating a screen for registering the reference voltage through the control monitor.

When the pull-down menu window A of the control monitor 13 is clicked, a new window for inputting the specification of the speed detector and the reference voltage is opened.

Referring to FIG. 6B, at the top of the screen for registering the speed detector specification, there is a list in which various specifications related to the speed detector can be registered, so that the user can input various specifications of the speed detector.

Further, at the lower end of the screen for registering the speed detector specification, there is a button for allowing the user to add, delete, modify and store the specification of the speed detector, so that the user can change information about the specification of the speed detector.

Referring to FIG. 6C, the user can input the reference voltage according to the rotational speed RPM of the rotating body 1.

Although the reference voltage is input at 500 RPM intervals, the interval of rotation speed and the reference voltage can be changed variously according to the speed detector test.

Also, the user can add, delete, modify and store the reference voltage according to the rotation speed.

6D is a diagram showing a screen for displaying test data of the speed detector through the control monitor.

Referring to FIG. 6D, the sensor test condition and the output voltage of the speed detector under test may be displayed.

FIG. 6E is an embodiment showing a screen for displaying the speed detector specification registered by the user.

Referring to FIG. 6E, it is possible to display the specification of the speed detector to be tested, and confirm the specification of the detector that the user is testing speed.

6F is an embodiment of a table showing the output voltage of the speed detector under test.

Referring to FIG. 6F, since the reference voltage for the speed detector and the output voltage of the speed detector under test are displayed according to the rotational speed of the rotating body 1, the user can check whether the speed detector is operating normally .

FIG. 6G is an embodiment of a screen for graphically displaying the results for the velocity detector under test. Figure 6h is an embodiment showing that the result graph for the speed detector under test is zoomed in.

6G and 6H, the abscissa represents the rotation speed (RPM) of the rotating body 1, and the ordinate represents the output voltage of the speed detector under test. Therefore, it is possible for the user to easily check the voltage outputted by the speed detector according to the target speed, which is the inputted rotation speed, in a graph.

Also, it is possible to use the zoom in function to check the graph more closely.

6I is an embodiment of a screen showing a manual operation mode of the speed detector test apparatus.

6I, there are a Run button and a Stop button, and there is a window for inputting the rotational speed (target speed) of the rotating body 1. [ Therefore, it is possible to control the rotational speed of the rotating body 1 at the rotational speed intervals inputted by the user.

6J is an embodiment of a screen showing an automatic operation mode of the speed detector test apparatus. 6K is an embodiment showing a window activated by clicking the START button in the automatic operation mode.

6J and 6K, there are START, STOP, PAUSE and CLEAR buttons on the screen showing the automatic operation mode.

When the user clicks the START button, the test data setting window is activated as shown in FIG. 6J.

Through the test data setting window, the user can set a test mode, a delay time, an up value, and a maximum speed.

The test mode has two types of linear and step types. The linear type increases the rotational speed of the rotating body 1 according to the rotational speed increase value, and the step type type has a stepwise The rotational speed of the rotating body 1 is increased.

When the user clicks the PAUSE button, the test of the speed detector is kept in the currently set state, and when the user clicks the CLEAR button, the set state of the speed detector is cleared. Also, when the user clicks the STOP button, the speed detector test is stopped.

FIG. 61 is an embodiment showing a message screen displaying the state of the velocity detector testing apparatus.

Referring to FIG. 61, the message screen displays the current state of the speed detector characteristic testing apparatus 100. FIG. For example, it is possible to display the test preparation of the speed detector, the completion of the test, the items to be changed during the test, etc., so that the user can easily grasp the state of the speed detector characteristic testing apparatus 100.

6M is an embodiment showing a screen for selecting a power source to be supplied to the speed detector.

Referring to FIG. 6M, the user can set to 'No' when the power is not supplied to the speed detector. When the power is supplied to the speed detector, 12 volts (V) of direct current (DC) Or 24 volts (V).

Since the power supplied to the speed detector can be selected, it is possible to supply the power according to the speed detector specification.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.

100: Speed detector characteristic test apparatus 1:
2: Servo motor 3: First fixing bracket
4: second fixing bracket 5: first connector
6: Second connector 7: Emergency button switch
8: Power on / off switch 9: Power cable terminal block
10: power supply unit 11:
12: A / D converter 13: Control monitor
14: Tooth

Claims (2)

A rotating body having teeth;
A servo motor for rotating the rotating body;
A fixing bracket fixing the speed detector at a predetermined interval to the gear of the rotating body;
An A / D (Analog to Digital) converter for converting an analog voltage signal generated by the speed detector into a digital voltage signal according to a gear of the rotating body, an interval between the speed detector and a rotating speed of the rotating body;
A control unit for controlling the rotation of the servomotor and calculating a rotation speed of the rotating body in accordance with the digital voltage signal; And
A set value for testing the speed detector, and a control monitor
And a turbine and feed pump speed detector characteristic testing device.
The method according to claim 1,
Further comprising an emergency button switch capable of interrupting the test of the speed detector,
Turbine and feed pump speed detector characteristics test equipment.

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