JP4585468B2 - Liquid quality sensor, liquid quality detection apparatus and method - Google Patents

Description

  The present invention relates to a liquid quality sensor, a liquid quality detection apparatus, and a method for detecting a change in liquid quality such as liquid leakage from a condenser of a thermal power generation facility, for example, a device through which seawater flows.

  Conventionally, in a thermal power generation facility or the like, steam generated in a boiler is cooled and condensed by a condenser and circulated and used as boiler water (pure water). Here, a cooling pipe for cooling the steam in the condenser is provided, and seawater for cooling flows through the cooling pipe. However, when a crack or the like occurs in the cooling pipe, seawater leaks from there. Then, it is mixed in the condensed boiler condensate, and the condensed water is mixed with salt to corrode various pipes. Therefore, various seawater leakage detection devices have been developed to check for seawater leakage from the condenser (see, for example, Patent Document 1).

  However, in the case of the above-described prior art, since the boiler water condensed at the lower part of the condenser is collected and liquid analysis is performed, the problem is that the leaked seawater is significantly diluted with the boiler water and the detection sensitivity is reduced accordingly. is there. In addition, the actual seawater leak is caused by a part of the condenser cracking, but in the case of the above technology, it is impossible to specify which part of the condenser is leaking, and it takes time to deal with it. There was also.

  Therefore, the present applicant has proposed a leak detection apparatus as shown in FIG. As shown in FIG. 20, the conventional leak detection device is installed below the target device 200 for liquid leak detection, and in a first direction parallel to one direction and a second direction intersecting with the one direction. A number of metal wires 2A to 2H, 3A, 3B that are arranged and spaced apart from each other, and values of electrical conductivity between any one of the metal wires 3A in the first direction and the metal wires 2D in the second direction, and then And a leak position specifying means 201 for specifying the leak position of the target device based on the crossing positions of the metal wires 3A and 2D (Patent Document 2, FIG. 1).

JP 2001-141596 A JP 2004-144708 A

  However, the leak detection apparatus according to Patent Document 2 is installed below the leak detection target device, and tries to detect a change in resistance between electrodes due to a difference in electrical conductivity when seawater and condensed water fall. Yes. In this method, seawater diluted with water is mixed in compared to the change in electrical characteristics between the electrodes when dripping water enters between the electrodes and when it does not (space or water vapor exists between the electrodes). In order to detect seawater dripping with small changes in electrical characteristics due to the sensor, it is necessary to stretch the sensor in a plane and very densely, and it is difficult to detect scattered seawater There's a problem.

Therefore, in order to be able to detect the scattered seawater, as shown in FIG. 21, a detection sensor 212 composed of a pair of bare electrodes 211-1 and 211-2 is immersed in the falling water recovery tank 210, The resistance of a pair of bare electrodes was measured by a TDR (Time Domain Reflectometry) device 213.
However, as shown in FIG. 22, the resistance of the bare electrode in the air shows good reflection at an attenuation rate of about 30% at 1.8 m, but when measured in water, the resistance is shown in FIG. As shown, there is a problem in that the attenuation rate is extremely lowered at the first portion of 1.8 m and measurement is not possible.
Therefore, there is a problem that it is difficult to accurately detect minute liquid leakage of seawater in a wide area such as a condenser.

  Accordingly, there is a demand for the emergence of a liquid leakage detection device that can reliably detect scattered seawater and can detect liquid leakage of a minute amount of seawater in a wide range.

  In view of the above problems, an object of the present invention is to provide a liquid quality sensor, a liquid quality detection device, and a method capable of stably detecting liquid leakage such as seawater leakage of a condenser with high sensitivity. And

A first invention of the present invention for solving the above-described problem is a liquid quality sensor comprising a pair of conductors for detecting a change in the liquid quality in a solution, and comprising a pair of conductors installed in the solution. both conductors, Ri Na exist insulating material to expose at least a portion, the solution detects the change in liquid property due to the leakage fluid of a different nature from, is disposed below the liquid leakage target device It is in the liquid quality sensor characterized by the above.

A second invention is the liquid quality sensor according to the first invention, characterized in that the change in the liquid quality is due to the fall, penetration or diffusion of the leaked liquid.

A third invention is the liquid quality sensor according to the first or second invention , wherein the exposed portions of the insulating material are formed at predetermined intervals along the axial direction of the conducting wire.

A fourth invention is the liquid quality sensor according to any one of the first to third inventions, wherein the exposed portion of the insulating material is formed along the axial direction of the conducting wire.

A fifth invention is the liquid quality sensor according to any one of the first to fourth inventions, wherein the dielectric constant of the insulating material is 3 or less.

According to a sixth invention, in any one of the first to fifth inventions, the pair of conductive wires, the insulating portion covering the pair of conductive wires, and a part of the insulating portion are formed. It exists in the liquid quality sensor which consists of an exposed groove part.

A seventh invention is a liquid quality sensor according to any one of the first to fifth inventions, comprising a pair of flat conductors and an insulating portion that insulates the pair of conductors so as to expose at least end faces of the conductors. is there.

According to an eighth invention, in any one of the first to fifth inventions, a flat or core-shaped lead wire and a substantially U-shaped lead wire, and the flat or core-like lead wire are substantially U-shaped. The liquid sensor includes an insulating portion that is disposed inside the conductive wire and includes an insulating portion that insulates the periphery of the flat or core-shaped conductive wire while exposing a part of the flat or core-shaped conductive wire.

According to a ninth invention, in any one of the first to fifth inventions, a core-shaped conductor, a sheath-shaped conductor disposed around the core-shaped conductor via an insulating material, and the outer conductor In the liquid quality sensor, a groove portion is formed by cutting out a part of the conductor and the insulating material, and a part of the core conductor is exposed.

According to a tenth invention, in any one of the first to fifth inventions, a core-shaped conductor, a mesh-shaped conductor arranged around the core-shaped conductor via an insulating material, and the insulating material In the liquid quality sensor, a groove part is formed by cutting out a part thereof, and a part of the core-shaped conductor is exposed.

According to an eleventh aspect of the present invention, in any one of the first to fifth aspects, a core-shaped conductor and a plurality of solid or hollow insulating materials having a rectangular or circular cross section around the core-shaped conductor. The liquid quality sensor is characterized by comprising a net-like conductive wire disposed in a line.

A twelfth aspect of the invention is a liquid quality sensor according to any one of the first to eleventh aspects of the invention, wherein the conducting wire has a cable shape.

13th aspect of the present invention is based on the liquid property sensor of any one invention of the first to 12, the time from when a pulse voltage is applied between the front Kishirube line to the reflecting voltage returns between each conductor And a liquid quality position identifying device for identifying the liquid quality change position.

A fourteenth invention is the liquid quality detection device according to the thirteenth invention, wherein the target device is a condenser and the liquid leakage is seawater.

The fifteenth aspect of the invention uses the liquid quality detection device of the thirteenth or fourteenth aspect of the invention . First, the impedance of a conducting wire in a steady state where leakage does not occur is periodically measured, and the relationship between the signal raw value and the distance is used. The original waveform is managed, the measured impedance value of the conducting wire is compared with a preset specified value, and when the impedance changes beyond the specified value, it is judged that there is a possibility of leakage and the specified value The liquid quality detection method is characterized in that it is determined that the steady state is reached.

A sixteenth aspect of the invention is the liquid quality detection method according to the fifteenth aspect of the invention, wherein the expansion and contraction and inclination of the impedance waveform are corrected and then a determination is made.

In a seventeenth aspect , in the fifteenth or sixteenth aspect, the level difference between the impedance measurement values at the starting point and the ending point of the immersion of the conducting wire is compared with a preset specified value. In the liquid quality detection method, it is determined that there is a possibility of occurrence of leakage when the impedance changes, and that it is determined that it is in a steady state when it is within a specified value.

In an eighteenth aspect based on the fifteenth aspect , the slope of the mobile N-point K-th order curve is calculated from the start point within the effective range of the conducting wire to be measured, and then the local signal change is calculated as the signal speed. According to the liquid quality detection method, the presence of leakage and / or the specification of the leakage position are performed based on the change in the signal speed.

  According to the present invention, liquid leakage can be reliably detected over a wide range, and for example, seawater leakage of a condenser can be detected with high sensitivity and stability.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

A liquid quality sensor, a liquid quality detection apparatus, and a method according to a first embodiment of the present invention will be described with reference to the drawings.
The liquid quality sensor of the present invention is a liquid quality sensor comprising a pair of conductors for detecting a change in the liquid quality in a solution, wherein both conductors of the pair of conductors installed in the solution are at least partially. An insulating material exists so as to be exposed. Here, the liquid quality change is not limited to the one in which the signal changes due to, for example, dropping, intrusion or diffusion of a solution different from the solution in which the liquid quality sensor is immersed. Such a component that changes (degrades, diffuses, etc.) the constituent elements of the liquid quality by the excitation action of a medium such as sound is also included. Also included are changes in factors over time, such as changes in the medium itself.

Hereinafter, in this embodiment, a liquid leak detection sensor will be described as an example of the liquid quality sensor.
FIG. 1 is a conceptual diagram illustrating a liquid leakage detection sensor that is a specific example of the liquid quality sensor according to the first embodiment. In the present embodiment, a condenser is used as the liquid leakage target device.
As shown in FIG. 1, a liquid leak detection sensor 100 according to the present embodiment is a solution that is installed below a condenser 101 that is a target device for liquid leak detection and has a different property from seawater 102 that is a leaked liquid. A liquid leakage detection sensor comprising a pair of conductors 104-1 and 104-2 installed in a certain condensed water 103, wherein both of the pair of conductors 104-1 and 104-2 are at least partially. An insulating material exists so as to be exposed. Reference numeral 105 is a recovery tank for recovering the condensed water 103, and 106 is steam.

  In the TDR method, the pair of conductors 104-1 and 104-2 is leaked by resistance change between the pair of conductors (two electrodes) 104-1 and 104-2 due to a change in electrical conductivity when seawater leaks. I try to detect it.

The exposed portion of the insulating material is preferably formed with a predetermined interval along the axial direction of the conducting wire. The predetermined interval means that an exposed portion is formed every 30 cm, 50 cm,.
More preferably, the exposed portion of the insulating material is formed over the entire axial direction of the conducting wire. This is because the leak detection range is improved by forming the exposed portion over the entire area.

In addition, the relative dielectric constant of the insulating material is preferably 3 or less. In general, although the relative dielectric constant of water varies depending on the conditions, it is about 80, so that the relative dielectric constant of, for example, resin or the like, which is not affected by the water, is set to 3 or less.
Examples of the insulating material having a relative dielectric constant of 3 or less include resins such as polyethylene (PE, relative dielectric constant: 2.3) and polypropylene (PP, relative dielectric constant: 2.3 to 2.7). it can.

  Hereinafter, specific examples of the liquid leakage detection sensor will be described with reference to FIGS.

FIG. 2 is a schematic cross-sectional view of the liquid leakage detection sensor according to the present embodiment. As shown in FIG. 2, the liquid leak detection sensor 10 according to the present embodiment includes a pair of conducting wires 11-1 and 11-2, an insulating portion 13 covering the pair of conducting wires 11-1 and 11-2, and the insulation. It is formed in a part of the part 13 and is composed of groove parts 14-1 and 14-2 that expose a part of the pair of conducting wires 11-1 and 11-2.
The width of the groove is made smaller than that of the conducting wire to prevent the conducting wire from jumping out. Specifically, it may be about 1/3 to 1/10 of the conductive wire.
In this embodiment, the conducting wire is 2 mmφ, and the groove portion of the insulating portion 13 is about 1 mm.

  By the exposed portions 15-1 and 15-2 of the groove portions 14-1 and 14-2, a resistance change between the electrodes including the pair of conductors 11-1 and 11-2 due to a change in electrical conductivity due to seawater leakage is increased. Sensitivity can be detected.

  FIG. 3 is a schematic cross-sectional view of the liquid leak detection sensor according to this embodiment. As shown in FIG. 3, the liquid leakage detection sensor 20 according to the present embodiment includes at least a pair of flat conductors 21-1 and 21-2 and a pair of flat conductors 21-1 and 21-2. It consists of an insulating part 23 that insulates the pair of conductors 21-1 and 21-2 so that the end face is exposed to form an exposed part 25-1.25-2.

  The exposed portions 25-1 and 25-2 can detect a change in resistance between the electrodes including the pair of conductors 21-1 and 21-2 due to a change in electrical conductivity due to leakage of seawater with high sensitivity.

  FIG. 4 is a schematic cross-sectional view of the liquid leakage detection sensor according to this embodiment. As shown in FIG. 4, the liquid leakage detection sensor 30 according to this embodiment includes a flat conductive wire 31, a substantially U-shaped conductive wire 32, and the flat conductive wire 31 that is a substantially U-shaped conductive wire 32. And an insulating portion 33 that insulates the periphery of the flat lead wire 31 as an exposed portion 35. In the present embodiment, a flat plate is used, but the present invention is not limited to this, and may be a core.

  The exposed portion 35 can detect a change in resistance between the pair of conductive wires 31 and 32 due to a change in electrical conductivity due to seawater leakage with high sensitivity.

FIG. 5 shows a schematic cross-sectional view of the liquid leakage detection sensor according to the present embodiment. As shown in FIG. 5, the liquid leak detection sensor 40 according to the present embodiment includes a core-shaped conductor 41 and a sheath-shaped conductor disposed around the core-shaped conductor 41 via an insulating portion 43. 42, a groove portion 44 in which a part of the outer conductor 42 and the insulating material 43 are cut out, and an exposed portion 45 is formed by exposing a part of the core conductor 41. .
This embodiment has a so-called coaxial cable shape, and the central conductor 41-1 has a diameter of 2 mmφ, and the insulating portion 43 has an outer diameter of 10 mmφ.

  The exposed portion 45 can detect a change in resistance between the pair of conductive wires 41 and 42 due to a change in electrical conductivity due to seawater leakage with high sensitivity.

  FIG. 6 shows a schematic cross-sectional view of the liquid leakage detection sensor according to this example. As shown in FIG. 6, the liquid leak detection sensor 50 according to the present embodiment includes a core-shaped conductor 51, and a net-shaped conductor 52 disposed around the core-shaped conductor 51 via an insulating material 53. A groove portion 54 is formed by cutting out a part of the insulating material 53, and a part of the core-shaped lead wire 51 is exposed to form an exposed portion 55.

  The exposed portion 55 can detect a change in resistance between the pair of conductive wires 51 and 52 due to a change in electrical conductivity due to seawater leakage with high sensitivity.

  FIG. 7 shows a schematic cross-sectional view of the liquid leakage detection sensor according to the present embodiment. As shown in FIG. 7, the liquid leak detection sensor 60 according to the present embodiment includes a core-shaped conductor 61 and a plurality of solid or hollow insulating portions 63 having a circular cross section around the core-shaped conductor 61. It consists of the net-like conducting wire 62 arrange | positioned through. Since a plurality of solid or hollow insulating portions 63 having a circular cross section are bundled and disposed around the core-shaped conductor 61, the exposed portion 65 of the conductor 61 is formed by a gap formed by them.

  The exposed portion 65 can detect a change in resistance between the pair of conductive wires 51 and 52 due to a change in electrical conductivity due to seawater leakage with high sensitivity.

Here, the measurement result of TDR when immersed in water using the liquid leak detection sensor 60 according to Example 7 described above is shown in FIG.
The total length of the liquid leak detection sensor 60 is about 20 m, and a length of about 1.8 m from the vicinity of about 8 m from the device connection portion is put in the water of the water tank.
As shown in FIG. 8, the liquid leak detection sensor 60 has a reflection at the end portion of approximately 1000 mρ and is hardly attenuated.
In this way, by increasing the covering of the conductive wire by the insulating portion 63 and reducing the amount of water entering between the exposed portion 65 and the electrode, attenuation in water can be reduced, and measurement over a long distance can be realized. found.

FIG. 9 shows an example of a liquid leak detection apparatus which is an example of a liquid quality inspection apparatus using such a liquid leak detection sensor.
As shown in FIG. 9, the liquid leakage detection device 70, which is an example of a liquid quality inspection device, applies a pulse voltage between the liquid leakage detection sensor 60 according to Example 7 described above and the pair of conductive wires. A liquid leakage position specifying device 71 that specifies the liquid leakage position of the target device based on the time until the reflected voltage returns between the conductors is provided. The condenser 101 has a plurality of cooling tubes 101a, and seawater 102 as cooling water flows into the cooling tubes. Steam 106 from the boiler is cooled by a cooling tube, becomes condensed water 103, and is collected in a lower collection tank 105.
A liquid leak detection sensor 60 is immersed in the recovery tank 105 at a predetermined distance from the liquid surface.

  FIG. 10 shows a hanger 80 in which the liquid leak detection sensor 60 is immersed at a predetermined distance from the liquid surface, and a plurality of floats 82 are connected via wires 81. A plurality of couplers 83 suspended from the wire 81 are immersed in the condensed water at a predetermined distance from the liquid surface.

The liquid leak detection sensor 60 and the liquid leak position specifying device 71 are connected by a signal line 72, process the detection result, and display the result as a warning on the monitor 73.
This display indicates the signal intensity, the presence / absence of liquid leakage from the signal intensity, and the location thereof.

FIG. 11 is an example showing a TDR measurement test result when the detection of seawater leak is simulated using the liquid leak detection device 70 of FIG.
In the test, a section of about 10 m of the liquid leak detection sensor 60 is spirally installed in a 750 × 750 mm container, submerged in circulating pure water, and TDR measurement is performed when seawater is dripped locally. went.

  As shown in FIG. 11, it was found that a change in impedance occurred in a part (4 m to 5 m and 7 m to 8 m) of the liquid leak detection sensor 60 immersed in water, and the change increased with time.

  In general, a condenser is a unit in which a structure in which a thin tube extending in the longitudinal direction is bent 180 degrees in a direction perpendicular to the same on a single plane and then folded back in the longitudinal direction is defined as one unit. A large number of layers are stacked in the direction. And the cooling seawater which flowed in from the entrance side of a thin tube cools the boiler vapor | steam sprayed on the outer side of a condenser, makes it condensed water, and flows out from the exit side of a thin tube. The condensed water is stored in a recovery tank installed below, and then reused as circulating water.

  In such a plurality of narrow tubes, for example, when leakage due to seawater corrosion occurs, seawater leaks from the corroded portion and falls into the recovery tank. Since the recovery tank is only condensed water, the liquid leak detection sensor usually shows an almost constant value, but when seawater falls, the ion concentration in the falling part changes, and this change is detected as a change in electrical conductivity. You can identify leaks.

  In the above embodiment, the condenser is exemplified as the liquid leakage target device. However, the present invention is not limited to this, and the liquid leakage detection sensor according to the present invention is applied to the liquid having different properties from the liquid leakage. It is possible to accurately detect leakage by installing and measuring the signal intensity in the TDR device.

Next, a signal processing method of the liquid leak detection sensor installed in the recovery tank of the condenser will be described.
(1) First Signal Processing Method First, the cable impedance in a steady state (a state in which no leakage has occurred) is periodically measured by the TDR measurement method described above, and the signal raw value and distance as shown in FIG. To manage the original waveform consisting of
Next, the cable impedance measurement value is compared with a preset specified value.

Then, when the impedance decreases beyond a specified value (for example, signal raw value: 30), a determination is made that “there is a possibility of leakage”. Further, when it is within the specified value, it is determined that the state is “steady state”.
In this signal processing method, even if the initial impedance of the cable is not uniform, it can be detected as a change from the initial state.

  Further, since the condenser is in a vacuum state, voids are generated at the beginning of the vacuum. Due to the generation of the void, the peak waveform of the impedance changes due to expansion and contraction. In this case, each peak value for a predetermined time is judged, and the deviation of the peak value is corrected to correct the raw data as shown in FIG. Thereby, even when the void is tied to the cable and the waveform of the impedance is changed, the correction can be made.

Here, in addition to the change in water quality due to the generation of voids, the correction can be similarly applied in the case of an environmental change such as temperature.
It is also effective to correct not only the expansion / contraction change in the length direction but also the overall inclination of the waveform.

(2) Second signal processing method The cable impedance in a steady state (a state where no leakage has occurred) is periodically measured, and the original waveform is managed (see FIG. 12).
Next, the level difference between the cable impedance measurement values at the start point and end point of the immersion cable is compared with a preset specified value. The result of this difference is shown in FIG.

  In the difference data relating to the second signal processing shown in FIG. 13, unlike the raw value as shown in FIG. 12, the impedance of the cable in the distance direction is taken into consideration, so the determination of the presence or absence of abnormality as a whole is improved. To do.

  Then, when there is a decrease exceeding a predetermined value (for example, difference signal: −30) defined in advance, it is determined that “there is a possibility of leakage”. Further, when it is within the specified value, it is determined that the state is “steady state”.

In the first signal processing method, in FIG. 12, when the initial impedance distribution is not uniform, the difference value may be increased or decreased due to the influence of sampling deviation or the like simply by taking the difference between the measurement results. is there. For example, when two differences in which the phase of the Sin function is shifted are calculated, the difference value becomes maximum when the differential value of Sin is maximum.
On the other hand, in the second signal processing method, it is possible to prevent erroneous detection due to a signal shift caused by such a phase shift.

  As described above, in the second signal processing, it is possible to determine whether or not there is a leakage abnormality as a whole by detecting a change in the signal in the distance direction of the cable.

(3) Third signal processing method When there is a possibility of leakage in the first signal processing or the second signal processing, the following signal processing is further performed.
First, the impedance of the cable is periodically measured, and the following processing is sequentially performed.
a) The second signal processing is smoothed. In this smoothing process, a moving average process is performed for M points (for example, 5 points), and the result is set as a difference / average process (see FIG. 14).
b) Next, the signal speed is calculated from the difference data shown in FIG. For example, the slope of the moving N-point quadratic curve (the following formula (1)) from the start point within the cable effective range is obtained by, for example, differentiation processing (the following formula (2)), and the local signal change is determined by the signal speed. (FIG. 15).
Quadratic approximation: y = ax2 + bx + c (1)
Speed calculation: dy / dx = 2ax + b (2)
Here, the x value is a distance value at the center of N points.

As shown in FIG. 15, a definitive determination of the presence of leakage and the specification of the leakage position are performed based on this change in signal speed (there is a large drop).
An alarm is output as needed from the speed data of the signal.
Also, as shown in FIG. 16, for example, a plurality of threshold values are provided, and alarm types and leak locations of seawater leakage attention (level 1), minor failure (level 2), and major failure (level 3) are transmitted step by step.

  As described above, by performing the third signal processing, it is possible to identify the degree of seawater leakage and the leakage position from the impedance distribution of the cable.

  In the difference data, when there is little noise, the smoothing process can be omitted.

  Further, without performing the difference data processing as shown in FIG. 13, the signal speed calculation processing is performed directly from the raw signal value (FIG. 12), and the degree of seawater leakage and the leakage position as shown in FIG. 15 are specified. May be.

  Also, as shown in FIG. 17, the signal processing is displayed in a display form, so that the intensity of the signal 121 at a specific location in the collection tank 105 is shown, and the visual judgment is made quickly. You may do it.

Next, a seawater leakage detection method using the liquid leakage detection apparatus will be described.
FIG. 18 is a flowchart for implementing a seawater leakage detection method using the liquid leakage detection apparatus.
As shown in FIG. 18, the presence or absence of an alarm of the liquid leakage detection device is determined (S101).
When there is an alarm, a position where the seawater concentration is high and its spread are confirmed (S102).
After confirmation, the system in which seawater is leaking is identified (S103).
Next, the system is stopped (S104).

If there is no alarm in step S101, the abnormal signal behavior at the specific position is confirmed although it is not the alarm level of the liquid leakage detection device (S105).
If there is no behavior, the presence or absence of an alarm in the liquid leak detection device is subsequently confirmed (S101).
On the other hand, if there is a behavior, it is determined whether or not the specific system is stopped (S106).
If it is determined to stop, a specific system is stopped (S104).

According to the present embodiment, it is possible to detect seawater leakage of the condenser with high sensitivity and stability.
Further, seawater leakage can be reliably detected, and the location where the leakage occurs can be quickly identified.

In addition, a seawater leak detection method using a combination of various inspection apparatuses (such as a chlorine concentration meter) and a main liquid leak detection apparatus will be described.
FIG. 19 is a flowchart for implementing a seawater leak detection method using various inspection apparatuses and a liquid leak detection apparatus.
As shown in FIG. 19, the presence / absence of an alarm for various inspection apparatuses is determined (S201).
If there is an alarm, the presence / absence of an alarm in the liquid leakage detection device is determined (S202).
When there is an alarm in the liquid leak detection device, a position where the seawater concentration is high and its spread are confirmed (S203).
After confirmation, the system in which seawater is leaking is specified, and then the system is stopped (S204).
Even if there is an alarm from various inspection devices, if there is no alarm from the liquid leakage detection device, there will be no seawater leakage, so monitoring is continued (S205).

As a result, when the alarm in the inspection device is a false alarm, a quick response is possible.
In particular, in chlorine concentration meters, etc., CO2 may be mixed due to changes in weather conditions, etc., resulting in fluctuations in the data in the inspection device. Instant judgment is possible.

  As described above, the liquid leakage detection sensor according to the present invention can reliably detect liquid leakage over a wide range, and is suitable for, for example, detecting seawater leakage of a condenser with high sensitivity and stability. Yes.

1 is a schematic diagram of a liquid leakage detection sensor according to Embodiment 1. FIG. 6 is a schematic cross-sectional view of a liquid leak detection sensor according to Embodiment 2. FIG. 6 is a schematic cross-sectional view of a liquid leak detection sensor according to Embodiment 3. FIG. 6 is a schematic cross-sectional view of a liquid leak detection sensor according to Embodiment 4. FIG. 10 is a schematic cross-sectional view of a liquid leakage detection sensor according to Embodiment 5. FIG. 10 is a schematic cross-sectional view of a liquid leak detection sensor according to Example 6. FIG. 10 is a schematic cross-sectional view of a liquid leak detection sensor according to Embodiment 7. FIG. It is a TDR measurement result figure of the liquid leak detection sensor concerning Example 7. FIG. 10 is a schematic diagram of a liquid leakage detection apparatus according to an eighth embodiment. It is the schematic of the hanging tool which concerns on Example 8. FIG. It is a figure which shows the TDR measurement test result at the time of simulating the detection of seawater leak. It is a result figure of the signal raw value of the TDR measurement test at the time of simulating detection of seawater leak. It is a difference signal figure which shows the TDR measurement test result at the time of simulating the detection of seawater leak. It is the difference signal figure which carried out the smoothing process which shows the TDR measurement test result at the time of simulating the detection of seawater leak. It is a signal speed calculation result figure of a TDR measurement test result at the time of simulating detection of seawater leak. It is a figure which shows an example of a determination and an alarm message. It is a display-like image figure which shows an example of an alarm message. It is a flowchart which implements the detection method of the seawater leak by a liquid leak detection apparatus. It is a flowchart which implements the detection method of the seawater leak using various test | inspection apparatuses and a liquid leak detection apparatus. It is the schematic of the leak detection apparatus of a prior art. It is a figure which shows the TDR measurement test apparatus of a prior art. It is a figure which shows the TDR measurement test result of a prior art. It is a figure which shows the TDR measurement test result of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Liquid leak detection sensor 101 Condenser 102 Seawater 103 Condensed water 104-1, 104-2 Conductor

Claims (18)

A liquid quality sensor comprising a pair of conductors for detecting a change in liquid quality in a solution,
Conductors of both of the pair of conductors is placed in the solution is, Ri Na exist insulating material to expose at least a portion,
Liquid quality sensor, characterized with, the Rukoto placed under the leakage target device to detect a change in liquid property due to the leakage fluid of a different nature from said solution. In claim 1,
The liquid quality sensor according to claim 1, wherein the change in the liquid quality is due to a drop, penetration or diffusion of the leaked liquid. In claim 1 or 2 ,
The liquid quality sensor, wherein the exposed portions of the insulating material are formed at predetermined intervals along the axial direction of the conducting wire. In any one of Claims 1 thru | or 3 ,
The liquid quality sensor, wherein the exposed portion of the insulating material is formed along the axial direction of the conducting wire. In any one of Claims 1 thru | or 4,
A liquid quality sensor, wherein the dielectric material has a relative dielectric constant of 3 or less. In any one of Claims 1 thru | or 5 ,
A pair of conductors;
An insulating portion covering a pair of conductors;
A liquid quality sensor comprising a groove portion formed in a part of the insulating portion and exposing a part of a pair of conductive wires. In any one of Claims 1 thru | or 5 ,
A pair of flat conductors;
A liquid quality sensor comprising an insulating portion that insulates a pair of conductive wires so that at least an end face of the conductive wire is exposed. In any one of Claims 1 thru | or 5 ,
A flat or core-shaped conductor and a substantially U-shaped conductor;
A liquid composed of an insulating portion that disposes the flat or core-shaped conducting wire inside the substantially U-shaped conducting wire and insulates the periphery of the flat or core-shaped conducting wire as an exposed portion. Quality sensor. In any one of Claims 1 thru | or 5 ,
A core-shaped conductor, and a sheath-shaped conductor disposed around the core-shaped conductor via an insulating material;
A liquid quality sensor formed by forming a groove portion in which a part of the outer conductor and the insulating material are notched and exposing a part of the core conductor. In any one of Claims 1 thru | or 5 ,
A core-shaped conductor, and a mesh-shaped conductor disposed around the core-shaped conductor via an insulating material;
A liquid quality sensor, wherein a groove part in which a part of the insulating material is notched is formed, and a part of the core-shaped conductor is exposed. In any one of Claims 1 thru | or 5 ,
A liquid quality comprising: a core-like lead wire; and a net-like lead wire disposed around the core-like lead wire through a plurality of solid or hollow insulating materials having a rectangular or circular cross section Sensor. In any one of Claims 1 thru | or 11 ,
The liquid quality sensor, wherein the conducting wire has a cable shape. A liquid quality sensor according to any one of claims 1 to 12 ,
A liquid comprising: a liquid quality position specifying device for specifying the liquid quality change position based on a time from when a pulse voltage is applied between the conductive wires to when a reflected voltage returns between the conductive wires. Quality detection device. In claim 13 ,
A liquid quality detection apparatus, wherein the target device is a condenser and the liquid leakage is seawater. Using the liquid quality detection device according to claim 13 or 14 ,
First, the impedance of a steady-state lead that has not leaked is measured periodically, and the original waveform consisting of the relationship between the raw signal value and the distance is managed,
Compare the impedance measurement value of the conducting wire with a preset specified value,
A liquid quality detection method comprising: determining that there is a possibility of leakage when the impedance changes beyond a specified value, and determining that the current is within a specified value. In claim 15 ,
A liquid quality detection method comprising correcting an expansion and contraction and an inclination of an impedance waveform and then making a determination. In claim 15 or 16 ,
Compare the level difference between the measured impedance values at the start and end points of the immersion wire with the specified value set in advance.If the impedance changes beyond the specified value based on the result of this difference, there is a possibility that leakage may occur. A liquid quality detection method characterized by performing a determination and determining that the state is in a steady state when the value is within a specified value. In claim 15 ,
Next, within the effective range of the conducting wire to be measured, the slope of the mobile N-point Kth order curve is calculated from the start point, and then the local signal change is calculated as the signal speed. A liquid quality detection method characterized by determining and / or specifying a leakage position.

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