KR101944690B1 - A monitoring system of water supply pipeline equipped with judgement function of cause of problem - Google Patents

Abstract

The present invention relates to a monitoring system of a water supply pipeline and, more specifically, to a monitoring system of a water supply pipeline capable of judging a cause of a problem when a problem occurs in a water supply pipeline. An object of the present invention is to provide a monitoring system capable of determining a cause of a problem when a problem such as water leakage occurs in a water supply pipeline. According to an embodiment of the present invention, a monitoring system of a water supply pipeline comprises: a pressure sensor attached to a water conveyance pipeline; an ultrasonic sensor attached to the water conveyance pipeline; an optical fiber wrapped around the water conveyance pipeline; and a monitoring device for determining a cause of water leakage by using the pressure sensor, the ultrasonic sensor, and the optical fiber when the water leakage occurs in a water conveyance pipeline.

Description

TECHNICAL FIELD [0001] The present invention relates to a monitoring system for a water pipe having an abnormality determination function,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a water pipe monitoring system, and more particularly, to a water pipe monitoring system capable of determining an abnormal cause when an abnormality occurs in a water pipe.

Currently, most domestic water pipelines are buried in the underground, but the aged pipelines occupy a considerable proportion, and the maintenance of the pipelines is insufficient to accelerate the deterioration of the pipelines. Therefore, the amount of annual leakage from the process of supplying water is expected to be considerable. This is a large loss of water resources, which may require additional pressurization facilities due to pressure loss, and may also make the maintenance of the pipeline more difficult, resulting in soil degradation around the pipeline where the leak occurs.

The cause of leakage is caused by the decrease in strength due to corrosion, the inadequacy of material and structure of pipeline connection, design and construction technology, internal factors of internal corrosion due to water pressure or water quality, External factors including damage due to earthquakes and the like. In order to minimize the occurrence of leakage due to various causes, it is necessary to detect, evaluate and follow-up countermeasures in the early stage when actual leakage occurs along with various preventive measures.

Conventional leakage location detection is performed by using portable equipment to directly detect and detect the location of leakage. This is a very inefficient way to compensate for this, by measuring leakage signals at ultra-low frequencies propagated using accelerometers or hydrophones, by using detection of arrival delay differences, and by using water pressure drop A method of detecting the leakage position, a method of detecting and detecting seismic waves based on the sensors at the points where leakage occurs by installing a plurality of sensors on the pipeline, and a pipeline.

Patent Registration No. 10-1696675 (Registration date 2017.01.10) Patent Registration No. 10-1791953 (published on October 25, 2017)

An object of the present invention is to provide a water pipe monitoring system capable of precisely detecting a leakage position.

An object of the present invention is to provide a water pipe monitoring system capable of minimizing the influence of unpredictable error factors due to use of only one type of sensor.

The present invention aims at providing a water line monitoring system capable of measuring the pressure at the leakage position.

An object of the present invention is to provide a water pipe monitoring system capable of determining an abnormal cause when an abnormality such as water leakage occurs in a water pipe.

Other objects and advantages of the present invention will be described hereinafter and will be understood by the embodiments of the present invention. Further, the objects and advantages of the present invention can be realized by the means and the combination shown in the claims.

According to a preferred embodiment of the present invention, a water line monitoring system includes a pressure sensor attached to a water line; An ultrasonic sensor attached to the water line; An optical fiber wrapped around a water line; And a monitoring device for determining the cause of the water leakage when water leakage occurs in the water line using the pressure sensor, the ultrasonic sensor, and the optical fiber.

Here, the monitoring device may determine an abnormal symptom according to the order of the abnormality detection using the sensing value of the pressure sensor, the abnormality detection using the sensing value of the ultrasonic sensor, and the abnormality detection using the optical fiber.

The monitoring device judges that the cause of the leak is an internal factor when a water leakage occurs in the water pipe, and the diagnosis result by the optical fiber is normal. If a leakage occurs in the water pipe and the result of diagnosis by the optical fiber is abnormal, .

The present invention can precisely detect a leak position using a pressure sensor and an ultrasonic sensor.

The present invention minimizes the influence of unexpected error factors due to the use of only one type of sensor by mixing the pressure sensor and the ultrasonic sensor.

The present invention can measure the pressure at the leakage position due to the non-linearly changing characteristics of the pressure on both sides with respect to the leakage position.

The present invention uses various diagnostic tools to distinguish the causes of the water pipe from internal or external factors.

1 is a schematic diagram of a water line monitoring system in accordance with a preferred embodiment of the present invention.
Figure 2 is a functional block diagram of the monitoring device of Figure 1;
3 is a view for explaining a method of calculating a leakage position in a water line according to a preferred embodiment of the present invention.
4 is a graph showing changes in sensed values of a pressure sensor and an ultrasonic sensor according to leakage
FIG. 5 is a diagram for explaining a method of calculating a predicted leak occurrence range in a water line according to a preferred embodiment of the present invention. Referring to FIG.
FIG. 6 is a diagram for explaining a method of calculating a predicted leak occurrence range in a water line according to a preferred embodiment of the present invention. Referring to FIG.
7 is a view for explaining a water pressure calculation method at a water leakage position according to a preferred embodiment of the present invention.
8 is a view for explaining a water pressure calculation method at a water leakage position according to another preferred embodiment of the present invention.
9 is a schematic diagram of a water line monitoring system according to another embodiment of the present invention.
Figure 10 is a functional block diagram of the monitoring device of Figure 9;
11 is an abnormality cause determination table.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Accordingly, it is to be understood that the invention is capable of numerous changes, has various embodiments, and includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown.

The terms first, second, etc. may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may be referred to as a first component.

And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present invention, the terms "comprising" or "having ", and the like, specify that the presence of stated features, integers, steps, operations, elements, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be construed as meaning consistent with meaning in the context of the relevant art and are to be interpreted as ideal or overly formal in meaning unless explicitly defined in the present invention Do not.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

Hereinafter, a water pipe monitoring system according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 is a schematic diagram of a water line monitoring system in accordance with a preferred embodiment of the present invention. Figure 2 is a functional block diagram of the monitoring device of Figure 1; 3 is a view for explaining a method of calculating a leakage position in a water line according to a preferred embodiment of the present invention. 4 is a graph showing changes in sensed values of the pressure sensor and the ultrasonic sensor according to leakage. FIG. 5 is a diagram for explaining a method of calculating a predicted leak occurrence range in a water line according to a preferred embodiment of the present invention. Referring to FIG. FIG. 6 is a diagram for explaining a method of calculating a predicted leak occurrence range in a water line according to a preferred embodiment of the present invention. Referring to FIG. 7 is a view for explaining a water pressure calculation method at a water leakage position according to a preferred embodiment of the present invention. 8 is a view for explaining a water pressure calculation method at a water leakage position according to another preferred embodiment of the present invention.

Referring to Figure 1, the monitoring system may include at least two measurement points (110, 120) on a water line. The plurality of measurement points may be spaced at equal intervals. For example, multiple measurement points may be spaced apart by 500 M intervals. Hereinafter, for convenience of explanation, reference numeral 110 denotes a first measurement point, and reference numeral 120 denotes a second measurement point.

A pressure sensor and an ultrasonic sensor may be installed on each measurement point 110, 120. Hereinafter, the pressure sensor SP1 provided on the first measurement point 110 is referred to as a first pressure sensor 110a and the ultrasonic sensor SS1 provided on the first measurement point 110 is referred to as a first pressure sensor 110a. The pressure sensor SP2 provided on the second measurement point 120 is referred to as a second pressure sensor 120a and the ultrasonic sensor SS2 provided on the second measurement point 120 is referred to as an ultrasonic sensor SS1, Is referred to as a second ultrasonic sensor 120b.

The first pressure sensor 110a and the first ultrasonic sensor 110b operate by receiving power from the communication power supply 200-1 and transmit the sensing value to the monitoring device through the communication power supply 200-1 in real time . The second pressure sensor 120a and the second ultrasonic sensor 120b operate by receiving power from the communication power supply 200-2 and monitor the sensing value and the sensing time information through the communication power supply 200-2 Device 400 in real time. When the monitoring device 400 is located remotely, the communication power devices 200-1 and 200-2 can communicate with the monitoring device 400 via the relay device 300. [

The first pressure sensor 110a, the first ultrasonic sensor 110b, the second pressure sensor 120a, and the second ultrasonic sensor 120b may be time-synchronized via GPS. The sampling rate of the first pressure sensor 110a, the first ultrasonic sensor 110b, the second pressure sensor 120a and the second ultrasonic sensor 120b may be, for example, 1 KHz.

Referring to FIG. 2, the monitoring apparatus 400 may include a data collection unit 410 and a determination unit 420.

The data collecting unit 410 may collect sensing values and sensing time information from the first pressure sensor 110a, the first ultrasonic sensor 110b, the second pressure sensor 120a, and the second ultrasonic sensor 120b.

The determining unit 420 uses the sensing value and the sensing time information from the first pressure sensor 110a, the first ultrasonic sensor 110b, the second pressure sensor 120a, and the second ultrasonic sensor 120b, , Leaks, leaks, leaks, expected leaks, and leaks.

Hereinafter, the determination unit 420 will be described in terms of whether or not to leak the water, the water leakage position, the expected range of occurrence of the water leakage event, and the pressure at the water leakage position. When the pressure value detected by the pressure sensors 110a and 120a falls below a preset ratio or when the ultrasonic sensors 110b and 120b detect a peak value equal to or higher than a threshold value as described later, It can be determined that a leak event has occurred in the water line.

Referring to FIG. 3, the first pressure sensor 110a and the first ultrasonic sensor 110b, the second pressure sensor 120a, and the second ultrasonic sensor 120b are disposed on the basis of the direction in which the fluid flows through the water pipe It is installed sequentially. At this time, FIG. 3 is shown assuming that leaking occurs in Pl.

Referring to FIG. 4, the initial pressure value (the pressure value in the steady state) of the first pressure sensor 110a is P01 and the initial pressure value of the second pressure sensor 120a is P02. The initial pressure value P02 of the second pressure sensor 120a is smaller than the initial pressure value P02 of the first pressure sensor 120a since the second pressure sensor 120a is farther away from the first pressure sensor 110a from the pressure source (e.g., 110a may be less than the initial pressure value P01. When leakage occurs, the pressures of the first measurement point 110 and the second measurement point 120 are lowered. At this time, the pressure drop at the leak position is transferred to both sides by the pressure wave velocity, causing a pressure drop at the first measurement point 110 and the second measurement point 120. The pressure wave propagation velocity in the fluid is known to be 1000 m / sec. However, the pressure wave propagation speed varies depending on external factors. Therefore, the pressure wave propagation velocity of the water line to which the present invention is applied can be calculated by the following equation.

here,

v: pressure wave propagation velocity (m / sec)

K: the modulus of elasticity of the liquid

E: Young's modulus of tubing

D: Inside tube

T: Tube thickness

The time t11 for detecting the pressure drop by the predetermined ratio (-3 dB) sensed by the first pressure sensor 110a which is relatively close to the pressure source is relatively longer than the first pressure sensor 110a Is faster than the time t12 for detecting a pressure drop by a predetermined ratio (-3 dB) sensed by the second pressure sensor 120a at a far distance. If leakage occurs in the middle between the first pressure sensor 110a and the second pressure sensor 120a, t11 and t12 will be the same. Based on this principle, the present invention can detect the leakage position by the time difference sensed by the two pressure sensors 110a and 120a by the following equation.

here,

t11: Time to detect a pressure drop by a predetermined ratio (-3 dB) sensed by the first pressure sensor 110a

t21: Time to detect a pressure drop by a predetermined ratio (-3 dB) sensed by the second pressure sensor 120a

v: pressure wave propagation velocity calculated in accordance with the above-mentioned equation (1)

L: a distance between the first pressure sensor 110a and the second pressure sensor 120a

xL is a distance from the center of the space between the first pressure sensor 110a and the second pressure sensor 120a to the second pressure sensor 120a side

According to Equation (2), if xL has a positive value, the leakage position is shifted from the center to the second pressure sensor 120a side by the magnitude of the numerical value calculated according to Equation (2) The leakage position can be determined to be a position offset from the center to the first pressure sensor 110a side by the value of the numerical value calculated according to Equation (2).

Accordingly, it is possible to accurately determine the leakage position using two pressure sensors. Hereinafter, the leakage position determined according to Equation (2) is referred to as Pp.

Referring again to FIG. 4, when water leakage occurs in the water line, the first ultrasonic sensor 110b and the second ultrasonic sensor 120b can sense a first peak signal above a threshold value. At this time, depending on the position of the noise source, the first ultrasonic sensor 110b and the second ultrasonic sensor 120b may detect a time at which the first peak signal above the threshold value is sensed. 4 illustrates a case where the leakage position is closer to the first ultrasonic sensor 110b than the second ultrasonic sensor 120b. In this case, the time t21 at which the first ultrasonic sensor 110b senses the first peak signal above the threshold value is earlier than the time t22 at which the second ultrasonic sensor 120b senses the first peak signal above the threshold value. The first ultrasonic sensor 110b and the second ultrasonic sensor 120b detect the first peak signal of the threshold value or more when the leakage position is located at the center in the space between the first ultrasonic sensor 110b and the second ultrasonic sensor 120b The time of sensing will be the same and the magnitude of the first peak signal will be the same. 4, since the first ultrasonic sensor 110b is closer to the noise source (leakage position) than the second ultrasonic sensor 120b and the signal attenuation is small, the first peak signal of the first ultrasonic sensor 110b is transmitted to the second ultrasonic sensor May be greater than the first peak signal. Since the first peak signal detected by the first ultrasonic sensor 110b and the first peak signal detected by the second ultrasonic sensor 120b are different according to the relative distance to the noise source, It is preferable to use the time to detect the leakage position.

The two ultrasonic sensors 120b can be used to detect the leakage position according to the following equation.

here,

t21: a time when the first ultrasonic sensor 110b senses the first peak signal exceeding the threshold value

t21: a time when the second ultrasonic sensor 120b detects the first peak signal above the threshold value

v: Ultrasonic velocity (generally, the ultrasonic velocity in fluid is 1500 m / s, the propagation velocity can be selectively applied depending on the type of fluid)

L: distance between the first ultrasonic sensor 110b and the second ultrasonic sensor 120b

xL is a distance from the center of the space between the first ultrasonic sensor 110b and the second ultrasonic sensor 120b to the second ultrasonic sensor 120b side

According to Equation (3), if xL has a positive value, the leakage position is shifted from the center to the second ultrasonic wave sensor 120b side by the value of the numerical value calculated according to Equation (3) The leakage position can be determined to be a position shifted from the center to the first ultrasonic sensor 110b side by the value of the numerical value calculated according to Equation (3).

Accordingly, it is possible to accurately determine the leakage position using two ultrasonic sensors. Hereinafter, the leakage position determined according to Equation (3) is referred to as Ps.

The position of leakage was judged by using two pressure sensors assuming various leakage positions, and the leakage positions were determined by using two ultrasonic sensors in the same manner. As a result, it was determined that the accuracy of the determination of the leakage position using the two ultrasonic sensors was higher than the method using the pressure sensor. This is because the sensing value of the ultrasonic sensor is less influenced by the factors other than the ultrasonic transmission medium, but the sensing value of the pressure sensor is the medium, the tube, the tube inner diameter and the tube thickness (factors that are not guaranteed according to the manufacturer or the manufacturing time) . This is due to the fact that it is highly influenced by. Therefore, the various tubes were tested and their error rates were analyzed. As a result, it was found that the average error was about 5% when the distance between the pressure sensors was 500m when using the pressure sensor to track the leakage position in the same manner as the shank, and it was found by using the ultrasonic sensor It is found that the average error is about 3% based on the distance between the ultrasonic sensors is 500m.

Hereinafter, for the sake of convenience of explanation, of the leakage position determination in the above-described manner,

i) The leakage position determined using two pressure sensors is Pp

ii) The leakage position determined using the two ultrasonic sensors is Ps

Quot;

영역 폭이고, Ds는 Ps를 중심으로 하는 기 설정된 초음파센서 누수 위치 오차 범위

영역 폭이고, Dol은 상기 두 오차 범위가 겹치는 영역 폭일 수 있다. 이때, 도 5는 Dp와 Ds가 일부 겹치는 것을 예시하며 도 6은 Ds 전부가 Dp와 겹치는 경우를 예시한다. 이때, 실제 누수 위치는 Pl일 수 있다. 확률적 개념에서, 누수 위치가 존재할 확률은 R1<R3<R2 일 수 있다. 즉, Dp와 Ps가 겹치는 영역에 실제 누수 위치가 존재할 확률이 가장 높을 수 있다. 아울러, Pp와 Ps 간의 간격(Ddiff)이 좁을수록 달리 표현하면, 압력센서와 초음파센서가 인지한 누수 위치가 서로 가까울수록 두가지 종류의 센서를 통해 파악한 누수 위치의 신뢰도가 높을 수 있다. Referring to FIG. 5, Dp is a predetermined pressure sensor leak position error range centered on Pp

Ds is the predetermined ultrasonic sensor leak position error range centered on Ps

And Dol is the width of the region where the two error ranges overlap. At this time, FIG. 5 illustrates that Dp and Ds partially overlap, and FIG. 6 illustrates a case where all Ds overlap with Dp. At this time, the actual leak position may be Pl. In the probabilistic concept, the probability that a leak location exists may be R1 <R3 <R2. That is, the probability that an actual leak position exists in the region where Dp and Ps overlap can be the highest. In addition, as the spacing Dpiff between Pp and Ps becomes narrower, the closer the leakage positions recognized by the pressure sensor and the ultrasonic sensor are closer to each other, the higher the reliability of the leakage position detected by the two types of sensors can be.

Accordingly, the present invention can determine the expected range of leak event occurrence according to the following equation.

= 겹치는 영역(Dol) 중심을 기준으로 하는 누수 이벤트 발생 예상 범위 구간here,

= Leaked area (Dol) Leakage event based on the center of the expected range

는 겹치는 정도에 기초하여 Ds를 확장하는 확장계수를 산출하는 식이며, 수학식 4에서

는 이종의 센서가 감지한 누수 위치 간의 차이에 기초하여, Ds을 축소하는 축소 계수를 산출하는 식일 수 있다. 여기서,

는 이종의 센서가 감지한 누수 위치 간의 차이의 최대값을 의미할 수 있다. In order to apply a consistent standard regardless of the narrow and wide overlapping region, Ds (relatively highly reliable interval) is used as a reference, and in Equation 4

Is an equation for calculating an expansion coefficient for expanding Ds based on the degree of overlap,

May be a formula for calculating a reduction factor for reducing Ds based on the difference between leaked positions sensed by different types of sensors. here,

May mean the maximum value of the difference between the leakage positions sensed by the different types of sensors.

As described above, the leaking position is detected by using different types of sensors, and the extension range and the reduction factor according to the mode in which the heterogeneous sensor senses the leaking position based on the highly reliable interval are applied to determine the leaking event occurrence expected range , It is possible to reliably calculate the construction section for repairing the leakage.

Assuming that the pressure drop at the leak position is linearly transmitted to both sides, it can be as shown in Fig.

At this time, the following two slopes can be derived, and the two slopes can be the same.

here,

P1: pressure value at the time of occurrence of the leak event measured by the first pressure sensor 110a

P2: the pressure value at the time of occurrence of the leak event measured by the second pressure sensor 120a

x1 is the distance from the leak position Pp calculated based on the two pressure sensors 110a and 110b to the first pressure sensor 110a

x2: distance from the leaked position Pp calculated based on the two pressure sensors 110a and 110b to the second pressure sensor 110a

Accordingly, the pressure Pl at the leaked position determined using the two pressure sensors can be calculated according to the following equation.

However, according to the above equation, Pl is infinite when leakage occurs in the middle between the two pressure sensors 110a and 110b (x1 = x2), so that the pressure at the leakage position can not be measured.

In this case, the pressure at the leakage position can be calculated using the pressure sensor 130a adjacent to the outside of any one of the two pressure sensors 110a and 110b. 8 illustrates a case where the pressure at the leak position is calculated by using the third pressure sensor 130a adjacent to the outside of the second input sensor 120a with x1 = x2. At this time, assuming that the pressure changes linearly on both sides with respect to the leakage position, the following equation can be established.

Accordingly, the pressure at the leakage position can be calculated according to the following equation.

As described above, according to the present invention, by calculating the pressure at the leakage position, the operator of the water line can easily recognize the damage range due to the occurrence of the leakage.

Hereinafter, a water line monitoring system according to another embodiment of the present invention will be described with reference to FIGS. 1 to 11. 9 is a schematic diagram of a water line monitoring system according to another embodiment of the present invention. Figure 10 is a functional block diagram of the monitoring device of Figure 9; 11 is an abnormality cause determination table. The following embodiments are characterized in that when an abnormality occurs in the water line, it is possible to distinguish the cause of the abnormality (in particular, the cause of the water leakage). In order to clarify the gist of the present invention, the elements overlapping with those described above will be omitted or simplified. In Figs. 9 to 11, the same reference numerals as those in Figs. 1 to 8 can perform the same functions as those in Figs. 1 to 8. Fig.

9, a first pressure sensor 110a and a first ultrasonic sensor 110b are installed at a first measurement point 110 and a second pressure sensor 110a and a second ultrasonic sensor 110b are installed at a second measurement point 120, The sensor 120a and the second ultrasonic sensor 120b may be installed.

The measured values of the first pressure sensor 110a and the first ultrasonic sensor 110b, the second pressure sensor 120a and the second ultrasonic sensor 120b are transmitted to the communication / power supply devices 200-1 and 200-2, To the monitoring device 400 via the network. The optical fiber 600 may be wound on the outside of the water pipe in a spiral shape. The optical measuring instrument 500 may be connected to the optical fiber 600. The optical measuring instrument 500 irradiates the test light to the optical fiber 600 and collects the reflected light reflected from the optical fiber 600 while the test light is traveling through the optical fiber 600. By analyzing the trace against the reflected light, the bent / broken position of the water line can be detected. For reference, the reflected light is abnormally large at the point where the water line is bent or broken, so that the abnormal position can be determined by analyzing the abnormal reflected light pattern. The present invention does not limit the method for determining the abnormality of the water pipe using the optical fiber 600, but can be applied to the method for determining the abnormality of the water pipe using various known optical fibers.

Referring to FIG. 10, the monitoring apparatus 400-1 may include a data collection unit 410-1 and a determination unit 420-1. The data collecting unit 410-1 collects the measurement values of the first pressure sensor 110a and the first ultrasonic sensor 110b, the second pressure sensor 120a and the second ultrasonic sensor 120b, And can receive the abnormality determination result information (information on abnormality, information on abnormality point). As shown in FIGS. 1 to 8, the judging unit 420-1 includes a first pressure sensor 110a, a first ultrasonic sensor 110b, a second pressure sensor 120a, and a second ultrasonic sensor 120b. Using the measured values, it is possible to detect the pressure in the water pipe leakage, the leak position, the expected range of the leak event occurrence, and the leakage position. The determination unit 420-1 determines the measurement values of the first pressure sensor 110a and the first ultrasonic sensor 110b, the second pressure sensor 120a and the second ultrasonic sensor 120b, ), The cause of the leak can be analyzed.

11 is an abnormality cause determination table serving as a reference for analyzing the cause of the abnormality of the determination section 420-1. The abnormality indication for the optical fiber is a case where an abnormal reflected light pattern is generated as a result of the measurement through the optical measuring instrument 500. The abnormality indications for the pressure sensors 110a and 120a are less than a predetermined value -3 dB), and the abnormality of the ultrasonic sensors 110b and 120b may be a case where a peak above the threshold value is detected.

11, anomalous factors can be classified into external factors of the water pipe and internal factors of the water pipe. The external factors of the water pipe can be classified into leakage due to impact generated by the construction and leakage due to settlement of the ground. The internal factors of the water pipeline can be classified as leaks due to pipe damage due to corrosion, other leaks due to weakening of the bond between pipe and piping, and a decrease in hydraulic pressure due to abnormality in hydraulic control.

First, in the case of an external factor, the order in which an abnormal symptom is detected through an optical fiber, a pressure sensor, and an ultrasonic sensor will be described.

i) First, in case of a leakage due to an impact caused by construction, the ultrasonic sensors 110b and 120b may detect the noise caused by the construction first. At this time, in determining an abnormal symptom using the sensing values of the ultrasonic sensors 110b and 120b, the noise generated by the vehicle running on the road can be treated as noise. For this purpose, the relatively short periodic noise is judged to be an abnormal symptom, and the relatively long periodical noise (vehicle noise) can be judged as noise. In the case of leakage due to the impact caused by the construction, the optical meter 500 can recognize the breakage state after the noise occurs and the water pipe breaks due to the construction, and the leakage due to the breakage of the water pipe is detected by the pressure sensors 110a, 120a. &Lt; / RTI > That is, in case of leaking due to impact caused by construction, an abnormal symptom may be detected in the order of sensing value of ultrasonic sensor -> detection of abnormality symptom in optical meter -> sensing value of pressure sensor in the order of abnormality detection .

ii) In case of leakage due to subsidence, the optical measuring instrument 500 can detect an event in which the water line is settled due to subsidence of the ground (detected through abnormal reflection light in the bent section). Further, the noise generated by sinking the water line can be detected through the sensing values of the ultrasonic sensors 110b and 120b. If the degree of settlement is severe and the water line is broken, it can be detected through the sensing values of the pressure sensors 110a and 120a. That is, in case of leakage due to subsidence, anomalous signs may be detected in the order of detection of anomalous signs in the optical measuring instrument -> detection of anomalous signs by the sensing value of the ultrasonic sensor -> sensing of the anomalous signs by the sensing value of the pressure sensor.

Hereinafter, in the case of an internal factor, an explanation will be given of a procedure in which an abnormal symptom is detected through an optical fiber, a pressure sensor, and an ultrasonic sensor. In the case of internal factors, it is assumed that the optical metrology results are normal. This is because events that are judged to be abnormal in the optical measuring instrument are less affected by internal factors.

i) In case of leakage due to pipe damage due to corrosion, the leakage event is detected first through the sensing values of the ultrasonic sensors 110b and 120b, and then the leak event is detected through the sensing values of the pressure sensors 110a and 120a Can be detected. This is because the ultrasonic waves propagate at a rate faster than the pressure wave in the event of a leak event. At this time, the diagnosis result by the optical measuring instrument 500 may be normal.

ii) In the case of leakage due to weakening of the coupling force between the piping and the piping (for example, joint loosening), the leakage event is detected first through the sensed values of the ultrasonic sensors 110b and 120b and then the pressure sensors 110a, 120a to detect a leak event. At this time, the diagnosis result by the optical measuring instrument 500 may be normal.

iii) In the case of the hydraulic pressure drop due to the hydraulic pressure abnormality, the abnormality can be detected only by the sensing values of the pressure sensors 110a and 120a. This is because noise does not occur in the case of a decrease in hydraulic pressure due to abnormality in hydraulic pressure control. At this time, the diagnosis result by the optical measuring instrument 500 may be normal.

Based on the above result, when the leakage occurred in the water pipe, and the diagnosis result by the optical fiber is normal, the judging unit 420-1 can judge that the cause of the leak is an internal factor, and the leakage occurred in the water pipe, When the diagnosis result is abnormal, the determination unit 420-1 can determine that the cause of the leak is an external factor.

As described above, the present invention is equipped with various abnormality symptom detection means (pressure sensor, ultrasonic sensor, optical fiber), and it is possible to judge an abnormal symptom according to the detection of abnormality symptoms and the abnormality detection order of the detection means. Thus, a work process required for maintenance can be easily grasped.

110, 120: measurement point
110a, 120a: Pressure sensor
110b, 120b: Ultrasonic sensor
200-1, 200-2: Communication / power supply device
400: Monitoring device
500: Optical measuring instrument
600: Optical fiber

Claims (3)

A pressure sensor attached to the water line;
An ultrasonic sensor attached to the water line;
An optical fiber wrapped around a water line; And
And a monitoring device for determining the cause of the water leakage when water leakage occurs in the water line using the pressure sensor, the ultrasonic sensor, and the optical fiber,
The monitoring device may determine an abnormal cause according to the order of the abnormality detection using the sensing value of the pressure sensor, the abnormality detection using the sensing value of the ultrasonic sensor, and the abnormality detection using the optical fiber,
The monitoring device judged that the cause of leakage was an internal factor when leakage occurred in the water pipe, and when the diagnosis result by the optical fiber was normal, it was determined that the cause of leakage was an internal factor, and when leakage occurred in the water pipe, In addition,
The monitoring device determines that an abnormal symptom is detected in the optical measuring instrument when an abnormal reflected light pattern is generated as a result of the measurement through the optical measuring instrument and when the pressure falls below a predetermined value lower than the initial pressure, If it is determined that the ultrasonic sensor detects a peak above a threshold value, it is determined that the ultrasonic sensor senses an abnormal symptom,
Wherein the monitoring device detects an abnormal symptom in the order of detection of an abnormal symptom by the sensing value of the ultrasonic sensor, detection of an abnormal symptom by the optical measuring instrument and detection of an abnormal symptom by sensing value of the pressure sensor, When an abnormal symptom is detected in the order of detection of an abnormal symptom in the optical measuring instrument, detection of an abnormal symptom by a sensing value of the ultrasonic sensor, and detection of an abnormal symptom by sensing value of the pressure sensor A water leakage event is sensed through a sensed value of the pressure sensor after sensing a leakage event through a sensed value of the ultrasonic sensor, The diagnosis result of the water pipe is normal, The water pressure of the pressure sensor, the ultrasonic sensor, or the optical fiber is detected only by the pressure sensor. When the pressure sensor detects the abnormality by the pressure sensor, Wherein the monitoring device determines that the relatively long periodic noise is noise and the relatively short periodic noise is an abnormal symptom.




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