JP2009294052A - Measurement system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a measurement system capable of acquiring a measurement value of a standby side, even in a measurement mode of a regular-use side, and checking the soundness of the standby side at its switching phase. <P>SOLUTION: The measuring system includes; two measurement systems consisting of the regular-use side and the standby side which have thermometers 11, 12 and temperature transducing sections 15, 16 for sending temperature signals on the basis of outputs of the thermometers 11, 12; a power supply 19 which is coupled with a recording section 14 for recording the temperature signals and applies a voltage for operating these measurement systems; a separate power supply 20; and a change-ver switch 13 for selectively connecting each measurement system to the power supplies 19, 20. The change-ver switch 13 performs such a switching/connecting operation that the measurement system of the regular-use side is connected to the power supply 19 and the recording section 14, and the measurement system on the standby side is connected to the power supply 20 in the use mode of the regular-use side; and in the use mode of the standby side, the measurement system of the standby side is connected to the power supply 19 and the recording section 14. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a measurement system, and is particularly useful when applied to a measurement system that measures the temperature of the intake port and drain port of a condenser in a power generation facility.

  In a thermal power generation facility, a steam turbine is rotated and driven by high-temperature and high-pressure steam, and power is generated by driving a generator using the steam turbine as a prime mover. The steam that has worked in the steam turbine is condensed in the condenser and returned to the water, and then circulated toward the boiler. That is, the condenser functions as a heat exchanger, and the steam supplied to the condenser is cooled with seawater and returned to water. Therefore, the condenser includes a water intake for taking in seawater as cooling water from the sea, and a water outlet for returning the seawater after heat exchange to the sea. Here, if the temperature difference between the seawater taken in through the intake port and the seawater returned to the sea through the drainage port is large, the environment may be adversely affected. Mandatory. For this reason, thermometers are installed on the intake side and the drain side, respectively, and the temperature of the seawater taken into the intake port and the temperature of the seawater discharged from the drain port are measured. Etc., and sent to a remote recording unit.

  Here, when only one pair of thermometers is provided on the water intake side and the water discharge side, there is a problem that measurement reliability is lacking. This is because if any one of the thermometers fails, a predetermined measurement cannot be performed. Therefore, a temperature measuring system is provided in which a standby side thermometer is provided on each of the water intake side and the water discharge side, and the temperature measuring system is made redundant so that it can be used by switching if one of the thermometers fails. desirable. In this case, if there are two systems from the thermometer to the recording unit for recording the measured temperature, complete redundancy can be achieved, but the cost increases accordingly. In view of this, there can be considered a system in which only two measurement systems are used and one recording system is used, and switching is provided by providing a switching means in the middle. For example, as shown in FIG. 5, the temperature measuring system includes two thermometers 1 and 2 on the water intake side, the thermometer 1 is used as the regular side, and the thermometer 2 is configured as the standby side. It can be constructed by selecting either the normal side or the standby side with the changeover switch 3 and inputting the temperature signal (measurement signal) to the recording unit 4. The drain side can be constructed with two measurement systems and one recording system in exactly the same manner.

  In such a temperature measurement system, the change-over switch 3 is usually provided at the site. This is because when an abnormality occurs, the operator grasps the abnormality state and switches to the system of the thermometer 2 on the standby side. Here, as the thermometers 1 and 2, those that measure the temperature of the measurement object by utilizing the fact that the resistance value of the temperature sensing portion changes in proportion to the temperature are widely used. In this type of thermometers 1 and 2, a signal representing the resistance value is converted into a current by the temperature conversion units 5 and 6 to form a temperature signal, and this temperature signal is supplied to the recording unit 4 via the changeover switch 3. It has become. Here, the power required for measurement is supplied from one power source 9 via the changeover switch 3. Moreover, the measured value of temperature is displayed on the display parts 7 and 8 of the temperature conversion parts 5 and 6.

  In such a temperature measurement system, when an abnormality of the system (normal system) related to one thermometer 1 is detected, the operator goes to the site and switches from the normal side to the standby side by operating the changeover switch 3. Yes.

  Patent Document 1 can be cited as an example of a conventional technique for achieving system redundancy.

JP-A-6-112865

  However, since the thermometers 1 and 2 of the temperature measurement system shown in FIG. 5 can measure a predetermined temperature for the first time in a state in which a voltage is applied from the power source 9, the normal side is selected by the changeover switch 3. The temperature conversion unit 6 including the standby thermometer 2 and the display unit 8 cannot be operated. For this reason, when switching to the standby side due to a failure on the regular side, there is no guarantee that the standby side is healthy. Further, the temperature instruction on the display unit 8 cannot be confirmed in advance when switching to the standby side. Furthermore, it is conceivable that the temperature instruction changes during an operation associated with switching, and the recording during this time becomes inaccurate. Incidentally, FIG. 5 shows that “20 ° C.” is displayed on the display unit 7 on the regular side, whereas there is no display on the display unit 8 on the standby side.

  In view of the above-described conventional technology, the present invention can also measure the measured value on the standby side even during measurement by the regular side, and can check the state of the measurement target in advance and also check the soundness of the standby side when switching. An object is to provide a measurement system.

  In order to achieve the above object, the first aspect of the present invention comprises a measuring means for measuring a physical quantity including temperature, and a signal converting means for sending a measurement signal representing the physical quantity based on the output of the measuring means. A power supply for supplying a voltage for the operation of the measurement system integrated with a recording means for recording the measurement signal, and another power supply separate from the power supply Switching means for selectively connecting each of the measurement systems to the one power source and the other power source, and the switching means is configured to switch the normal measurement system to the one in one mode. The standby side measurement system is connected to the other power source while the standby side measurement system is connected to the one power source and the recording means. Switching connection In the measurement system, characterized in that is obtained by configuration so that.

  According to this aspect, the standby-side measurement system is also maintained in the active state by the standby-side power supply even during normal use in which a predetermined physical quantity is measured by the normal-side measurement system. Therefore, when an abnormality occurs on the regular side, it is possible to quickly determine the soundness on the standby side.

  According to a second aspect of the present invention, in the measurement system according to the first aspect, the switching unit connects the standby measurement system to the one power source and the recording unit in the other mode. The measuring system is configured to connect the other power source to the measuring system on the regular side.

  According to this aspect, even when switching to the standby side due to an abnormality on the normal side, it is possible to supply power for determining the quality of the signal conversion means on the normal side.

  According to a third aspect of the present invention, there is provided the measurement system according to the first aspect or the second aspect, wherein the switching means is constituted by a cam switch.

  According to this aspect, the switching means can be easily configured.

  According to a fourth aspect of the present invention, in the measurement system according to any one of the first to third aspects, the physical quantity is a temperature on the intake side or a temperature on the drain side of the condenser of the power generation facility. There is a measuring system characterized by being.

  According to this aspect, the temperature of the seawater on the intake side or drainage side of the condenser can be managed well.

  According to the present invention, the standby-side measurement system is also maintained in the active state by the standby-side power supply even during normal use in which a predetermined physical quantity is measured by the regular-side measurement system. Therefore, when an abnormality occurs on the regular side, it is possible to quickly determine the soundness on the standby side. As a result, when an abnormality occurs on the regular side, switching to the standby side can be performed smoothly. Also, the continuity of the recording data at the time of switching is maintained well.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic diagram showing an entire temperature measurement system according to an embodiment of the present invention. As shown in the figure, the water reservoirs C and D of the intake port A and the drain port B have thermometers (11A, 11B), (12A, 12A) via floats (9A, 9B), (10A, 10B). 12B) is provided. Here, the thermometers 11A and 12A are the service side, and the thermometers 11B and 12B are the standby side. The thermometers (11A, 11B) and (12A, 12B) on the service side and standby side respectively send resistance value data representing the temperatures measured toward the temperature conversion units (15A, 15B) and (16A, 16B). To do. The change-over switches 13A and 13B are for selecting either the service side or the standby side and sending the seawater temperature information of the storage units C and D to the recording unit 14.

  FIG. 2 is a block diagram showing a temperature measurement system according to the present embodiment corresponding to FIG. Here, since the structures on the intake side and the drain side are exactly the same, only the structure on the intake side is shown. As shown in the figure, of the two thermometers 11 and 12, the thermometer 11 is used as the normal side, and the thermometer 12 is set as the standby side. Either one is selected and a temperature signal is input to the recording unit 14. Here, in the temperature measurement system according to the present embodiment, not only the power supply 19 on the normal side but also the power supply 20 is provided on the standby side, and the switch 13 is commonly used as a temperature measurement system for sending a temperature signal to the recording unit 14. Even when the side is selected, a voltage is also applied to the temperature measurement system on the standby side via the changeover switch 13 so that the temperature measurement result of the thermometer 12 can be displayed on the display unit 18 of the temperature conversion unit 16. It is comprised so that it may become. Incidentally, FIG. 2 shows a state in which “20 ° C.” is displayed on the display unit 17 on the normal side, and “20 ° C.” that is the temperature measurement result of the thermometer 12 is also displayed on the display unit 18 on the standby side. Yes.

  On the other hand, when the changeover switch 13 is switched to select the standby side as the temperature measurement system for sending the temperature signal to the recording unit 14, the power supply 19 on the normal side and the recording unit 14 become the temperature measurement system on the standby side. In addition to being connected, the power supply 20 on the standby side is connected to the temperature measuring system on the regular side.

  The function and structure of the changeover switch 13 in this case will be described with reference to FIGS. 3 and 4 showing this part in more detail. FIG. 3 is a circuit diagram showing the temperature measurement system according to the present embodiment in the normal use mode, and FIG. 4 is a circuit diagram showing the temperature measurement system according to the present embodiment in the standby use mode. In FIG. 3 and FIG. 4, the same parts as those in FIG. 1 and FIG. Also here, since the configurations of the intake side and the drain side are exactly the same, only the configuration of the intake side is shown.

  As shown in FIG. 3, in the normal use mode, the change-over switch 13 has contacts 13a, 13b, 13c, 13d indicated by black circles closed and contacts 13e, 13f, 13g, 13h indicated by white circles opened. Yes. As a result, a current path as shown by a thick line in FIG. 3 is formed.

  In such a normal use mode, a signal from the thermometer 11 operated by a voltage applied from the power source 19 via the change-over switch 13 is processed by the temperature conversion unit 15 to form a temperature signal. Is recorded by the recording unit 14 via the changeover switch 13. At this time, a voltage is applied to the thermometer 12 on the standby side from the power source 20 via the changeover switch 13. As a result, the temperature conversion unit 16 processes the signal from the thermometer 12 and displays the temperature on the display unit 18. In this state, a predetermined temperature measurement and recording are performed via the regular-side thermometer 11 and the temperature conversion unit 15.

  On the other hand, when an abnormality occurs on the normal side, for example, when a signal line from the thermometer 11 to the temperature conversion unit 15 is disconnected, the abnormal state is detected and notified by a separate alarm device, so an abnormal state occurs. After detecting this, the operator goes to the site, confirms the cause of the abnormality, and switches the selector switch 13. At the time of such switching, the operator can perform predetermined switching after confirming the soundness of the standby side by visually checking the display on the display unit 18 on the standby side.

  FIG. 4 is a circuit diagram in the use mode on the standby side after switching. As shown in FIG. 4, in the use mode on the standby side, the contacts 13e, 13f, 13g, 13h indicated by black circles of the changeover switch 13 are closed and the contacts 13a, 13b, 13c, 13d indicated by white circles are opened. The As a result, a current path as shown by a thick line in FIG. 4 is formed.

  In such a standby-side use mode, a signal from the standby-side thermometer 12 operated by a voltage applied from the power source 20 via the change-over switch 13 is processed by the temperature conversion unit 16 to form a temperature signal, This temperature signal is recorded by the recording unit 14 via the changeover switch 13. That is, the service-side thermometer 11 is disconnected, and a predetermined temperature measurement and recording are continued via the standby-side thermometer 12 instead.

  At this time, in the present embodiment, a voltage is applied from the power source 20 to the regular temperature conversion unit 15 via the changeover switch 13. As a result, the quality of the temperature conversion unit 15 can be determined at the same time. Incidentally, when a voltage is not applied from the power source 20 to the temperature conversion unit 15, normality or abnormality of the temperature conversion unit 15 itself cannot be specified even if an abnormality in the temperature measurement system on the regular side is detected. This is because, in order to detect an abnormality in the temperature conversion unit 15, it is necessary to prepare a separate power source, apply a voltage, and inspect its soundness.

  Thus, according to this embodiment, during normal use, the predetermined temperature is measured by the normal temperature measurement system, and the standby temperature measurement system is also maintained in the active state. Therefore, when an abnormality occurs on the regular side, it is possible to quickly determine the soundness on the standby side. As a result, when an abnormality occurs on the regular side, switching to the standby side can be performed smoothly.

  The change-over switch 13 is not particularly limited in its structure as long as it has the above-mentioned change-over function, but is preferably constituted by a rotary switch or a cam switch that can change the contact by rotating the shaft. obtain.

  In the above-described embodiment, when the standby-side temperature measurement system is used, the voltage is supplied from the standby-side power source to the regular-side recording unit 14, but such a configuration is essential. is not. However, when configured as in the present embodiment, it is possible to easily detect the quality of the temperature conversion unit 15 on the regular side.

  Furthermore, although the said embodiment demonstrated as a temperature measurement system which measures the temperature of the water intake side and drainage side of the condenser of power generation equipment, of course, it is not restricted to this. It is not necessary to limit the use as a temperature measurement system, and it can be applied to all uses. Moreover, it is not limited to temperature measurement. The present invention can be widely applied as a general measurement system when a physical quantity measurement system is made redundant.

  The present invention can be effectively used in the industrial field related to the maintenance and operation of electric power equipment.

It is a mimetic diagram showing the whole temperature measuring system concerning an embodiment of the invention. It is a block diagram which shows the temperature measurement system which concerns on embodiment of this invention. It is a circuit diagram which shows the temperature measurement system which concerns on embodiment of this invention in the use mode by the side of normal use. It is a circuit diagram which shows the temperature measurement system which concerns on embodiment of this invention in the use mode by the side of a standby. It is a block diagram which shows the temperature measurement system which concerns on a prior art.

Explanation of symbols

11, 12 Thermometer 13 Changeover switch 14 Recording unit 15, 16 Temperature conversion unit 17, 18 Display unit 19, 20 Power supply

Claims (4)

A measuring system of two systems, a normal side and a standby side, having measuring means for measuring a physical quantity including temperature and signal conversion means for sending a measurement signal representing the physical quantity based on an output of the measuring means;
One power supply for supplying a voltage for the operation of the measurement system integrated with a recording means for recording the measurement signal, and another power supply separate from the power supply;
Switching means for selectively connecting each of the measurement systems and the one power source and the other power source, and
In one mode, the switching unit connects the measurement system on the normal side to the one power source and the recording unit, and connects the measurement system on the standby side to the other power source. A measurement system, wherein the measurement system on the side is configured to be switched and connected so as to be connected to the one power source and the recording means. The measurement system according to claim 1,
The switching means is configured to connect the measurement system on the standby side to the one power source and the recording unit and to connect the other power source to the regular measurement system in the other mode. A measurement system characterized by In the measurement system according to claim 1 or claim 2,
The measuring system characterized in that the switching means comprises a cam switch. In the measurement system according to any one of claims 1 to 3,
The measurement system according to claim 1, wherein the physical quantity is a temperature on a water intake side or a temperature on a drain side of a condenser of a power generation facility.

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