KR100852039B1 - Water leakage sensing device of heat piping and its method - Google Patents

Abstract

The present invention relates to a heat pipe leak detection apparatus, comprising: a power supply unit supplying a predetermined voltage to a circuit; A sensing line extending from the power supply unit to the ground portion and providing a second switch and a fourth switch at an end of the ground portion and embedded in an insulation region between the outer diameter and the inner diameter of the pipeline; A current detector for detecting a leakage point current flowing from the leaking position through the insulation resistance and the first switch and the polarization voltage removing capacitor; A variable resistor for measuring the leak position; A reference resistor disposed between the point connected to the first switch and the fourth switch at an end of the sensing line, the reference resistor for obtaining a resistance value of the sensing line; An A / D converter converting the analog data signal provided from the current detector into a digital signal; A microprocessor controlling the variable resistor and arithmetic processing data provided from the A / D converter; A communication unit which transmits data provided from the microprocessor to a repeater; A display unit for visually notifying whether or not a leak occurs according to a command of the microprocessor; An alarm generating unit for audibly notifying whether or not a leak occurs according to a command of the microprocessor; And a switch control unit controlled by the microprocessor to control the first switch, the second switch, the third switch, and the fourth switch.

The microprocessor measures the leakage point current by the current detector to indirectly measure the insulation resistance, and compares the measured insulation resistance with a reference insulation resistance value in a steady state to have a large difference of more than a predetermined threshold. It is determined that a leak has occurred in the pipeline.

Thereby, the leaking position can be measured accurately using the bridge circuit law.

Description

Heat pipe leak detection device and its method {WATER LEAKAGE SENSING DEVICE OF HEAT PIPING AND ITS METHOD}

1 is a schematic diagram showing an entire system of a heat pipe leak detection apparatus according to the present invention;

2 is a schematic diagram of a heat pipe leakage detecting apparatus in which a variable resistor is composed of a first digital potential meter and a second digital potential meter, according to the present invention;

3 is a schematic diagram of a heat pipe leakage detecting apparatus in which a variable resistor is constituted by a distribution digital potentiometer according to the present invention;

4A is a circuit diagram for measuring insulation resistance according to the present invention;

4B is a bridge circuit diagram for measuring a leaking position according to the present invention;

4C is a bridge circuit diagram for measuring a resistance value of a sensing line according to the present invention;

5 is an exemplary diagram illustrating polarization voltage;

6 is a cross-sectional view and a cross-sectional perspective view showing a structure of a pipeline according to the present invention;

7 is a schematic view showing the shape of a sensing line according to the present invention;

8 is a flow chart showing a heat pipe leak detection method according to a first embodiment of the present invention;

9 is a flowchart showing a heat pipe leak position measuring method according to a second embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

1: Heat pipe leak detection device 2: Repeater

3: host computer 10: power supply

20: display unit 30: A / D conversion unit

40: microprocessor 50: communication unit

60: switch control unit 70: alarm generating unit

81: detection line 82: first digital potential meter

83: second digital potentiometer 84: first switch

85: second switch 86: third switch

87: fourth switch 88: first sense wire resistance

89: second sensing line resistance 90: reference resistance

91: insulation resistance 92: current detection unit

93: Leakage point current 94: Leakage position

95: polarization voltage removing capacitor 96: ground

97: digital potentiometer for distribution 98: variable resistor

100: pipeline

The present invention relates to a heat pipe leak detection apparatus, and more particularly, to a heat pipe leak detection apparatus capable of accurately measuring a leak position using a bridge circuit law.

Conventionally, when a fluid flowing through a pipeline, such as a water pipe or oil pipe, leaks from a pipe due to damage, aging, or other causes of the pipe, the leak point and the degree of leakage can be easily determined if the pipe is exposed to the outside. As you can see, the repair of the pipe can proceed relatively quickly.

However, if the pipe is buried underground and visually blocked from the outside, it is not economical because the pipe can be detected only after the leak is reached and the fluid has reached the advanced state. In addition to the large phosphorus loss, there was a problem in that it takes a lot of time and expense in repairing the pipe because the leak point can not be accurately measured.

In order to solve such a problem, various methods have been proposed in the related art, but the conventional method has a problem in that the leakage position measured at the time of occurrence of leakage includes an error due to polarization due to the insulation of the pipe or the characteristics of the medium of the fluid.

As a result, it was difficult to find the exact location of the leaking point, and there was a difficulty in digging all the regions within a certain error range or verifying by digging several points within the error range.

Accordingly, an object of the present invention is to provide a heat pipe leak detection apparatus capable of accurately measuring a leak position using the bridge circuit law.

In addition, another object of the present invention is to provide a heat pipe leak detection apparatus that enables accurate measurement of insulation resistance and accurate leak position measurement by removing polarization voltage that may occur in insulation resistance.

The object is, according to the present invention, a power supply for supplying a predetermined voltage to the circuit; A sensing line extending from the power supply to the ground and providing a second switch and a fourth switch at an end of the ground, and embedded in an insulation region between the outer diameter and the inner diameter of the pipe; A current detector for detecting a leakage point current flowing from the leaking position through the insulation resistance and the first switch and the polarization voltage removing capacitor; A variable resistor for measuring the leak position; A reference resistor disposed between the point connected to the first switch and the fourth switch at an end of the sensing line, the reference resistor for obtaining a resistance value of the sensing line; An A / D converter converting the analog data signal provided from the current detector into a digital signal; A microprocessor controlling the variable resistor and arithmetic processing data provided from the A / D converter; A communication unit which transmits data provided from the microprocessor to a repeater; A display unit for visually notifying whether or not a leak occurs according to a command of the microprocessor; An alarm generating unit for audibly notifying whether or not a leak occurs according to a command of the microprocessor; And a switch control unit controlled by the microprocessor to control the first switch, the second switch, the third switch, and the fourth switch.

The microprocessor measures the leakage point current by the current detector to indirectly measure the insulation resistance, and compares the measured insulation resistance with a reference insulation resistance value in a steady state to have a large difference of more than a predetermined threshold. This is accomplished by a heat pipe leak detection device that determines that a leak has occurred in the pipeline.

Preferably, the polarization voltage generated in the insulation resistance can be removed through the polarization voltage removing capacitor.

In addition, the sensing wire is divided into a sensor wire and a return wire, and the sensor wire is formed of an alloy of nickel and chromium having a predetermined resistance value, and has a structure where the coating is peeled off at predetermined intervals.

On the other hand, the variable resistor, the first digital potentiometer provided on the power supply side at the point where the conductive line extending from the power supply to the ground portion side and the conductive line connected to the A / D converter in the current detection unit meets; It may be composed of a second digital potential meter provided on the ground side.

Preferably, the indirect measurement of the insulation resistance is such that the first switch connects the insulation resistance and the current detector, opens the second switch and the fourth switch, shorts the third switch, The first digital potential meter is controlled to the maximum value, and the second digital potential meter is controlled to 0 to measure the leakage point current flowing from the power supply to the insulation resistance and the first switch, and the measured leakage The point current is referred to as I _C , the voltage supplied from the power supply unit is referred to as V _C , the resistance between the leaking positions in the power supply unit is referred to as a first sensing line resistance (R _S1 ), and the insulation resistance is represented by R _{In the case of P} , since the first sensing wire resistance is relatively small compared to the insulation resistance, if R _P + R _{S 1} == R _P ,

R _P = V _C / I _C

The insulation resistance can be indirectly measured.

Preferably, the leak position measurement, the insulating switch and the current detection unit is connected to the first switch, the second switch and the third switch is short-circuited, the fourth switch is opened, the power supply unit The first digital potential meter and the second digital potential meter are controlled such that the leakage point current flowing through the insulation resistance and the first switch becomes 0, so that the values of the first digital potential meter and the second digital potential are adjusted. Respectively, R _C1 and R _C2 , and the resistance between the leaking position in the power supply unit is called a first sensing line resistance (R _S1 ), and the resistance between the leaking position and the grounding portion is the second sensing line resistance (R). _S2 ), through the bridge circuit law

R _S1 / R _S2 = R _C1 / R _C2

The leak position can be measured.

Preferably, the first switch is connected to the end of the sensing line and the current detector, the second switch is open, the third switch and the fourth switch is short-circuited, the first switch in the power supply The first digital potential meter and the second digital potential meter are controlled such that the leakage point current flowing to the zero becomes 0, and the values of the first digital potential meter and the second digital potential are respectively R _C1 and R _C2 . When the resistance of the sensing line is defined as R _S1 + R _S2 , and the reference resistance is defined as R _S3 , the following equation by the bridge circuit law is obtained.

R _S1 + R _S2 = (R _C1 * R _S3 ) / R _C2

The resistance value of the sensing line in a steady state can be measured.

On the other hand, the heat pipe leak detection method of the heat pipe leak detection device, the step of supplying power to the components of the circuit including the sensing line; Open the second switch and the fourth switch, short the third switch, and control the first digital potentiometer to a maximum value; Controlling the second digital potential meter to zero; Measuring the leakage point current flowing from the power supply unit to the insulation resistance and the first switch through the current detection unit; Indirectly measuring the insulation resistance by dividing the supplied power by the measured leakage point current; And determining that leakage occurs in the pipeline when the indirect measured insulation resistance has a large difference greater than or equal to a predetermined threshold value in comparison with the reference insulation resistance in a steady state.

On the other hand, in the heat pipe leakage position measuring method of the heat pipe leakage detection device, when the leakage occurs, the insulating switch and the current detector is connected to the first switch, and short-circuit the second switch and the fourth switch Opening the third switch; Controlling the first digital potential meter and the second digital potential meter; Measuring the leakage point current flowing from the power supply unit to the insulation resistance and the first switch through the current detection unit; Determining whether the measured leakage point current is zero; And measuring the leakage position as a ratio of the value of the first digital potential meter and the value of the second digital potential meter when the measured leakage point current is zero.

Preferably, the variable resistor is mutually connected to the power supply side and the ground side at a point where a conductor extending from the power supply to the ground side and a conductor connected to the A / D converter in the current detection unit meet each other. It may be provided as a digital potentiometer for distribution arranged to divide the resistance value.

In this case, the indirect measurement of the insulation resistance is such that the first switch connects the insulation resistance and the current detection unit, opens the second switch and the fourth switch, shorts the third switch, and distributes the distribution. The digital potentiometer is controlled to the maximum value on the power supply side and 0 on the ground side to measure the leakage point current flowing from the power supply to the insulation resistance and the first switch, and the measured The leakage point current is referred to as I _C , the voltage supplied from the power supply is referred to as V _C , the resistance between the power supply and the leakage location is referred to as a first sensing line resistance (R _S1 ), and the insulation resistance is R _{In the case of P} , since the first sensing wire resistance is relatively small compared to the insulation resistance, if R _P + R _{S 1} == R _P ,

R _P = V _C / I _C

The insulation resistance can be indirectly measured.

In addition, the leak position measurement, the insulating switch and the current detection unit is connected to the first switch, the second switch and the third switch is short-circuited, the fourth switch is opened, the power supply in the The distribution digital potentiometer is controlled so that the insulation resistance and the leakage point current flowing to the first switch are zero, so that the power supply side resistance value and the ground side resistance value of the distribution digital potential meter are respectively R _C1. And R _C2 , and the resistance between the power supply and the leaking position is called a first sensing line resistance (R _S1 ), and the resistance between the leaking position and the grounding portion is called a second sensing line resistance (R _S2 ). If defined, the following equation by the bridge circuit law

R _S1 / R _S2 = R _C1 / R _C2

The leak position can be measured.

On the other hand, the first switch is connected to the end of the sensing line and the current detector, the second switch is open, the third switch and the fourth switch is short-circuited, flowing from the power supply to the first switch The distribution digital potential meter is controlled so that the leakage point current becomes zero, and the resistance value of the power supply side and the ground side side of the distribution digital potential meter are referred to as R _C1 and R _C2 , respectively. When the resistance of the wire is defined as R _S1 + R _S2 , and the reference resistance is defined as R _S3 , the following equation by the bridge circuit law

R _S1 + R _S2 = (R _C1 * R _S3 ) / R _C2

The heat pipe leak detection apparatus, characterized in that for measuring the resistance value of the sensing line in the steady state.

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

2, the heat pipe leak detection apparatus 1 according to the present invention includes a power supply unit 10 for supplying a predetermined voltage to the circuit; Extending from the power supply unit 10 to the ground portion 96, the second switch 85 and the fourth switch 87 is provided at the end of the ground portion 96 side, the outer diameter and the inner diameter of the pipeline 100 A sensing line 81 embedded in an insulating region therebetween; A current detecting unit 92 for detecting a leak point current 93 flowing from the leaking position 94 through the insulation resistance 91, the first switch 84, and the polarization voltage removing capacitor 95; A variable resistor (98) for measuring the leak position (94); A reference resistor 90 is disposed between the point connected to the first switch 84 and the fourth switch 87 at the end of the sensing line 81, to obtain a resistance value of the sensing line 81. )and; An A / D converter 30 for converting an analog data signal provided from the current detector 92 into a digital signal; A microprocessor (40) for controlling the variable resistor (98) and arithmetic processing data provided from the A / D converter (30); A communication unit (50) for transmitting data provided from the microprocessor (40) to a repeater; A display unit 20 visually informing of whether or not a leak occurs according to a command of the microprocessor 40; An alarm generation unit 70 for audibly informing of whether or not a leak occurs according to a command of the microprocessor 40; And a switch control unit 60 controlled by the microprocessor 40 to control the first switch 84, the second switch 85, the third switch 86, and the fourth switch 87.

The microprocessor 40 measures the leakage point current 93 by the current detector 92 to indirectly measure the insulation resistance 91, and when the current detection unit 92 is in a normal state with the measured insulation resistance 91. When the value of the reference insulation resistance 91 is compared and the difference is greater than a predetermined threshold value, it is determined that a leak occurs in the pipeline 100.

Hereinafter, each configuration will be described in detail.

6 is a cross-sectional view and a cross-sectional perspective view showing the structure of the pipeline 100 employed in the present invention, Figure 7 is a detection line 81 of the insulating line disposed between the inner diameter and the outer diameter of the pipeline 100 Schematic diagram showing the shape.

As shown in FIG. 6, the sensing line 81 is embedded between the inner diameter and the outer diameter of the pipeline 100, and the periphery of the sensing line 81 is filled with an insulating material.

In addition, the sensing wire 81 is divided into a sensor wire and a return wire, and the sensor wire has a structure in which the coating is peeled off at an interval of 1.5 [cm], as shown in FIG. 7. Has

Here, the sensor wire may be provided in various kinds to have a predetermined resistance value, preferably, an alloy of nickel (Ni) and chromium (Cr).

At this time, the resistivity value per 1 [m] of the sensor wire provided by the alloy of nickel and chromium is 5.7 [Ω], and the sensor wire of 1 [km] has a resistance value of 5.7 [kΩ].

In addition, the return wire may be provided in various kinds, preferably, made of copper (Cu), the specific resistance value per [m] is 0.03 [Ω], relatively small compared to the sensor wire Has a value.

Here, the insulation resistance 91 is a resistance between the pipeline 100 and the sensing line 81, and from about 50 [MΩ] or more in a state where no leakage occurs, when the leakage occurs, approximately 100 It is reduced to [Ω].

Therefore, when an abnormality occurs in the pipeline 100 and fluid flows into the insulating material of the pipeline 100, the insulation resistance 91 between the main pipeline 100 and the sensing line 81 is increased. By changing, the abnormality of the pipeline 100 can be detected.

In this case, the value of the insulation resistance 91 that determines that leakage occurs in the pipeline 100 may be variously set, for example, may be set to 1 [MΩ], or 100 [kΩ]. It may be set.

On the other hand, the reference resistor 90 is a point connected to the first switch 84 and the fourth switch 87 at the end of the sensing line 81 to measure the resistance value of the sensing line 81. It is provided between and is provided with a fixed resistance having a predetermined resistance value.

In addition, the A / D converter 30 is provided to convert the analog data signal provided from the current detector 92 into a digital signal and provide it to the microprocessor 40.

Here, the microprocessor 40 calculates the value of the insulation resistance 91 by arithmetic processing data input from the A / D converter 30, and controls the variable resistance to detect the leak point 94. Calculate the position of.

When the calculated value of the insulation resistance 91 is compared with the insulation resistance 91 in the normal state, it is determined that a leakage occurs in the pipeline 100 when the difference is greater than a predetermined threshold.

At this time, the microprocessor 40 operates the alarm generator 70 and the display unit 20 to generate an audible and visual alarm by the alarm sound and to display the abnormality of the pipeline 100.

In addition, as shown in FIG. 1, the microprocessor 40 transmits data to the repeater 2, and the data collected in each repeater 2 are sequentially transmitted to the host computer 3.

In general, it is preferable to have ten or less heat pipe leakage detecting devices 1 connected to the one repeater 2.

The repeater 2 functions to relay a communication signal between the heat pipe leakage detecting apparatuses 1 and the host computer 3, and the host computer 3 of the heat pipe leakage detecting apparatus 1 Check the status and notify the system operator.

In general, the one host computer (3) is configured to manage about 200 of the heat pipe leakage detection device (1).

On the other hand, the switch control unit 60 is controlled by the microprocessor 40, and controls so that (1) and (2) of the first switch 84 is connected or (1) and (3) is connected, In addition, the second switch 85, the third switch 86 and the fourth switch 87 is controlled to open or short.

Here, when indirectly measuring the insulation resistance 91, the switch control unit 60 controls so that (1) and (2) of the first switch 84 is connected, and the second switch 85 and The fourth switch 87 is controlled to open, and the third switch 86 is controlled to be shorted.

In addition, when measuring the position of the leak detection point 94, the switch control unit 60 controls so that (1) and (2) of the first switch 84 is connected, the second switch 85 ) And the third switch 86 are short-circuited, and the fourth switch 87 is controlled to open.

In addition, when measuring the resistance value of the sensing line 81, the switch control unit 60 controls so that (1) and (3) of the first switch 84 is connected, the second switch 85 ) Controls to open, and the third switch 86 and the fourth switch 87 is controlled to be short-circuited.

On the other hand, the power supply unit 10 supplies power to the circuit and various components of the heat pipe leakage detection device 1 according to the present invention, it can supply AC or DC power in accordance with the voltage required to drive each component. have.

The current detector 92 is provided to measure the leakage point current 93 flowing toward the insulation resistor 81, and removes the first switch and the polarization voltage between the insulation resistor 81 and the current detector 92. The condenser 95 is provided.

Here, the polarization voltage removing capacitor 95 is provided to remove the polarization voltage that may occur in the insulation resistor 81 by the leakage of the pipeline 100.

In the related art, as shown in FIG. 5, an error of the insulation resistance 81 due to a polarization voltage occurs, and an error occurs in the measurement of the leakage location 94.

If the error range is wide, a lot of time and money have to be invested in finding the actual leak location 94.

Therefore, the heat pipe leakage detecting apparatus 1 according to the present invention provides the polarization voltage removing capacitor 95 for removing the polarization voltage which may occur in the insulation resistance 81, thereby accurately correcting the leakage position 94. ) Can be measured.

On the other hand, the variable resistor 98 is provided to measure the leak location 94, and is controlled by the microprocessor 40.

As shown in FIG. 2, the variable resistor 98 may extend from the power supply unit 10 to the ground portion 96 and from the current detector 92 to the A / D converter 30. At the point where the conductive wires meet, the first digital potential meter 82 provided on the power supply unit 10 side and the second digital potential meter 83 provided on the ground unit 96 side may be configured.

The first digital potential meter 82 and the second digital potential meter 83 are respectively controlled by the microprocessor 40 to have a predetermined resistance value.

Here, when indirectly measuring the insulation resistance 91, first, the switch control unit 60 controls the first switch 84 so that the insulation resistance 91 and the current detector 92 are connected.

That is, the switch control unit 60 controls so that (1) and (2) of the first switch 84 is connected.

In addition, the switch control unit 60 controls the second switch 85 and the fourth switch 87 to be opened, and controls the third switch 86 to be short-circuited.

On the other hand, the microprocessor 40 controls the first digital potential meter 82 to the maximum value, and if the second digital potential meter 83 is controlled to 0, the circuit of the form as shown in Figure 4a Becomes

Here, when power is supplied from the power supply unit 10, the current flowing through the insulation resistance 91 may be measured through the current detector 92.

In this case, the leakage point current 93 measured by the current detection unit 92 is referred to as I _C , the voltage supplied from the power supply unit 10 is referred to as V _C , and the leakage position in the power supply unit 10. The resistance between the 94 electrodes is referred to as a first sensing line resistance (R _S1 ) 88, and when the insulation resistance 91 is referred to as R _P , the first sensing line resistance 88 is the insulation resistance 91. Since R _P + R _S1 == R _P because it is relatively small compared to), the microprocessor 40 uses the following equation based on Ohm's law.

R _P = V _C / I _C

The insulation resistance 91 may be indirectly measured.

Here, the microprocessor 40 determines that leakage occurs in the pipeline 100 when the measured value of the insulation resistance 91 has a difference greater than a predetermined threshold value from the value of the insulation resistance 91 in a normal state. do.

On the other hand, as described above, when the leak occurs in the pipeline 100 to measure the leak position 94, first, the first switch 84 is the insulation resistance 91 and the current detector ( 92 is connected, and the second switch 85 and the third switch 86 are short-circuited, and the fourth switch 87 is opened to form a bridge circuit as shown in FIG. 4B.

Here, the first digital potential meter 82 and the second digital potential meter 83 are controlled so that the leakage point current 93 flowing through the insulation resistance 91 and the first switch 84 becomes zero. The values of the first digital potential meter 82 and the second digital potential meter 83 are referred to as R _C1 and R _C2 , respectively, and the resistance between the leaking positions 94 in the power supply unit 10 may be determined. When the first sensing line resistance (R _S1 ) 88 is defined and the resistance between the ground portion 96 is defined as the second sensing line resistance (R _S2 ) 89 at the current leakage position 94, The third processor 40 has the following equation by the bridge circuit law,

R _S1 * R _C2 = R _C1 * R _S2

If you binomial the same kind on both sides,

R _S1 / R _S2 = R _C1 / R _C2

Since R _C1 and R _C2 are values controlled by the microprocessor 40 and are already known, the values of R _S1 / R _S2 can be obtained.

Therefore, the leakage position 94 may be measured by substituting the resistance value per length of the sensing line 81 through the value of R _S1 / R _S2 .

For example, if a leak occurs in the pipeline 100 having a total length of 1 [km] and the measured value of R _S1 / R _S2 is 1, the leak position 94 is the detection line 81. 0.5 [km] from the starting point embedded in the pipeline 100.

In addition, for example, when a leak occurs in the pipeline 100 having a total length of 1 [km], and the measured value of R _S1 / R _S2 is 0.5, the leak position 94 is the detection line. It is 0.25 [km] from the starting point embedded in the pipeline 100 of 81.

On the other hand, even when the polarization voltage is generated in the pipeline 100, since the polarization voltage is removed by the polarization voltage removing capacitor 95, it is possible to reduce the measurement error of the leakage position 94 due to the polarization voltage.

On the other hand, the heat pipe leakage detection device 1 according to the present invention can measure the resistance value of the detection line 81 in the normal state.

First, the switch controller 60 controls the first switch 84 to be connected to the terminal of the sensing line 81 and the current detector 92, and to control the second switch 85 to be opened. When the third switch 86 and the fourth switch 87 are controlled to be shorted, a bridge circuit of the type shown in FIG. 4C is obtained.

Here, the first digital potential meter 82 and the second digital potential meter 83 are controlled so that the current flowing through the first switch 84 becomes 0, so that the first digital potential meter 82 and the When the values of the second digital potential meter 83 are referred to as R _C1 and R _C2 , respectively, the resistance of the sensing line 81 is referred to as R _S1 + R _S2 , and the reference resistance 90 is defined as R _S3 . , The microprocessor 40 is the following formula by the bridge circuit law,

(R _S1 + R _S2 ) * R _C2 = R _C1 * R _S3

If you binomial R _C2 to the right term,

R _S1 + R _S2 = (R _C1 * R _S3 ) / R _C2

Since R _C1 and R _C2 are values controlled by the microprocessor 40 and are already known, and R _S3 is a fixed resistance, the detection line 81 when the heat pipe leakage detecting device 1 is in a normal state. ) Can be measured.

On the other hand, the variable resistor 98 of the heat pipe leakage detection device 1 according to the present invention, as shown in Figure 3, and the wire extending from the power supply 10 to the ground portion 96 side and; At the point where the conducting wire connected from the current detector 92 to the A / D converter 30 meets, the power supply unit 10 and the ground unit 96 are divided so that mutual resistance is divided. It may also be configured as a digital potential meter 97.

That is, the distribution digital potentiometer 97 has a predetermined resistance value, and when some resistance value is assigned to the power supply unit 10 side, the grounding unit 96 side has the remaining resistance value.

Here, even when the variable resistor 98 is provided as the distribution digital potentiometer 97, the measurement of the insulation resistance 91 and the measurement of the leakage position 94 are the same as described above.

Hereinafter, the heat pipe leak detection method and the heat pipe leak position measuring method according to the present invention will be described in detail for each embodiment.

Prior to the description, each embodiment is an example of a heat pipe leakage detecting device 1 in which the variable resistor 98 is composed of the first digital potential meter 82 and the second digital potential meter 83. The case where the variable resistor 98 is the distribution digital potentiometer 97 is as described later.

First Embodiment (FIGS. 2 and 8)

In the heat pipe leakage detecting method according to the first embodiment of the present invention, the leakage point current (93) flowing through the insulation resistance (91) is measured by the current detector (92) to determine the resistance value of the insulation resistance (91). Indirect measurement, and if the measured value of the insulation resistance 91 and the reference insulation resistance 91 in a steady state has a large difference of more than a predetermined threshold, the leak occurred in the pipeline 100 It is characterized by determining.

First, the power supply unit 10 supplies power for driving each component and circuit of the heat pipe leakage detecting apparatus 1 (S11).

Next, the switch control unit 60 controls so that (1) and (2) of the first switch 84 is connected, and controls so that the second switch 85 and the fourth switch 87 is opened. In operation S12, the third switch 86 is short-circuited.

In addition, the microprocessor 40 controls the first digital potential meter 82 to a maximum value, and controls the second digital potential meter 83 to 0 (S12).

Next, the current detector 92 measures the leakage point current 93 flowing from the power supply unit 10 to the insulation resistance 91 and the first switch 84 (S13).

At this time, the polarization voltage generated by the insulation resistance 91 is removed by the polarization voltage removing capacitor 95.

Next, the measured leakage point current 93 is referred to as I _C , and the voltage supplied from the power supply 10 is referred to as V _C , and the resistance between the leakage locations 94 in the power supply 10 is measured. The first sensing line resistance (R _S1 ) 88 is referred to, and when the insulation resistance 91 is R _P , the first sensing line resistance 88 is relatively small compared to the insulation resistance 91. Therefore, if R _P + R _S1 == R _P , the microprocessor 40 is

R _P = V _C / I _C

The insulation resistance 91 is indirectly measured (S14).

Next, the microprocessor 40 defines the measured insulation resistance 91 as R _P 'and defines the insulation resistance 91 measured at the steady state of the pipeline 100 as R _P , where R _P and If the difference of R _P 'is equal to or greater than a predetermined reference threshold (S15), it is determined that an abnormality has occurred in the pipeline 100 (S16).

Therefore, the heat pipe leak detection apparatus 1 according to the present invention can accurately measure the leak location 94 using the bridge circuit law.

In addition, the heat pipe leakage detecting apparatus 1 according to the present invention enables the accurate measurement of the insulation resistance 91 and the accurate leakage position 94 by removing the polarization voltage which may be generated in the insulation resistance.

Second Embodiment (FIGS. 2 and 9)

In the heat pipe leakage position measuring method according to the second embodiment of the present invention, the first digital potential meter (82) and the second digital potential such that the leakage point current (93) measured by the current detector (92) becomes zero. The meter 83 is controlled to measure the leakage position 94 as a ratio of the values of the first digital potential meter 82 and the second digital potential meter 83.

First, the switch controller 60 controls (1) and (2) of the first switch 84 to be connected, and controls the second switch 85 and the third switch 86 to be short-circuited. In operation S12, the fourth switch 87 is opened.

Next, the microprocessor 40, the first digital potential meter 82 and the second digital potential meter 83 so that the current flowing through the insulation resistance 91 measured by the current detector 92 becomes zero. ) Is controlled (S22).

Next, the microprocessor 40 measures the current flowing through the insulation resistance 91 by the current detector 92 (S23), and determines whether the measured current becomes 0 (S24).

At this time, the polarization voltage generated by the insulation resistance 91 is removed by the polarization voltage removing capacitor 95.

Next, when the measured leakage point current 93 is 0, the values of the first digital potential meter 82 and the second digital potential meter 83 are referred to as R _C1 and R _C2 , respectively, and the power supply unit At 10, the resistance between the leak location 94 is called a first sensing line resistance (R _S1 ) 88, and the resistance between the leak location 94 and the ground portion 96 is referred to as a second sensing line. Defining the resistance (R _S2 ) 89, the microprocessor 40 is, through the following equation by the bridge circuit law

R _S1 / R _S2 = R _C1 / R _C2

The leak position 94 is measured (S25).

Therefore, the heat pipe leak detection apparatus 1 according to the present invention can accurately measure the leak location 94 using the bridge circuit law.

In addition, the heat pipe leak detection apparatus according to the present invention, by removing the polarization voltage that can be generated in the insulation resistance 91 to enable accurate measurement of the insulation resistance 91 and accurate measurement of the leakage position (94). do.

Therefore, the heat pipe leak detection apparatus 1 according to the present invention can accurately measure the leak location 94 using the bridge circuit law.

In addition, the heat pipe leakage detection device 1 according to the present invention, by removing the polarization voltage that may be generated in the insulation resistance 91, the accurate measurement of the insulation resistance 91 and the accurate measurement of the leakage position 91 To make it possible.

Claims (13)

A power supply unit supplying a predetermined voltage to the circuit; A sensing line extending from the power supply unit to the ground portion and providing a second switch and a fourth switch at an end of the ground portion and embedded in an insulation region between the outer diameter and the inner diameter of the pipeline; A current detector for detecting a leakage point current flowing from the leaking position through the insulation resistance and the first switch and the polarization voltage removing capacitor; A reference resistor disposed between the point connected to the first switch and the fourth switch at an end of the sensing line, the reference resistor for obtaining a resistance value of the sensing line; An A / D converter converting the analog data signal provided from the current detector into a digital signal; A variable resistor comprising a digital potential meter whose value is variable and provided to measure the leak position; A microprocessor for controlling a value of the digital potential meter and arithmetic processing data provided from the A / D converter; A communication unit which transmits data provided from the microprocessor to a repeater; A display unit for visually notifying whether or not a leak occurs according to a command of the microprocessor; An alarm generating unit for audibly notifying whether or not a leak occurs according to a command of the microprocessor; A bridge controlled by the microprocessor to control the first switch, the second switch, the third switch, and the fourth switch, the bridge including the reference resistor and the variable resistor for measuring a leak position of the pipeline; A switch control unit constituting a circuit; The microprocessor measures the leakage point current by the current detector to indirectly measure the insulation resistance, and compares the measured insulation resistance with a reference insulation resistance value in a steady state to have a large difference of more than a predetermined threshold. Determine that a leak has occurred in the pipeline, A heat pipe leakage detecting apparatus, comprising: a bridge circuit configured through control of switches through the switch control unit and control of the variable resistor, and measuring a leak position by calculating a resistance value or a resistance value ratio using a bridge circuit law; . The method of claim 1, And a polarization voltage generated by the insulation resistance is removed through the polarization voltage removing capacitor. The method of claim 1, The sensing wire is divided into a sensor wire and a return wire, and the sensor wire is formed of an alloy of nickel and chromium having a predetermined resistance value, and has a structure in which a coating is peeled off at predetermined intervals. Device. The method of claim 1, The variable resistor may include a first digital potential meter and the ground part provided at the power supply part at a point where a conductive line extending from the power supply part to the ground part side and a conductive line connected to the A / D converter part in the current detection part meet. A heat pipe leak detection apparatus, comprising: a second digital potential meter provided on the side. The method of claim 4, wherein Indirect measurement of the insulation resistance is such that the first switch is connected to the insulation resistance and the current detector, the second switch and the fourth switch are opened, the third switch is shorted, and the first digital The potential meter is controlled to the maximum value, and the second digital potential meter is controlled to 0 to measure the leakage point current flowing from the power supply unit to the insulation resistance and the first switch, thereby measuring the measured leakage point current I. _The voltage supplied from the power supply unit is referred to as _C , and the resistance between the leaking positions in the power supply unit is referred to as a first sensing line resistance (R _S1 ), and the insulation resistance is referred to as R _P. Since the first sensing wire resistance is relatively small compared to the above insulation resistance, if R _P + R _{S 1} == R _P , R _P = V _C / I _C Heat pipe leakage detection apparatus, characterized in that for measuring the insulation resistance indirectly. The method of claim 5, wherein Leakage position measurement, the first switch is connected to the insulation resistance and the current detection unit, the second switch and the third switch is short-circuited, the fourth switch is opened, the insulation resistance and The first digital potential meter and the second digital potential meter are controlled such that the leakage point current flowing through the first switch becomes 0, so that the values of the first digital potential meter and the second digital potential are respectively R _C1 and R. _C2 , the resistance between the leakage position in the power supply unit is called the first sensing line resistance (R _S1 ), and the resistance between the leakage position and the ground portion is defined as the second sensing line resistance (R _S2 ) By the bridge circuit law R _S1 / R _S2 = R _C1 / R _C2 The heat pipe leakage detection apparatus, characterized in that for measuring the leak position. The method of claim 4, wherein The first switch is connected to the end of the sensing line and the current detection unit, the second switch is open, the third switch and the fourth switch short-circuited, the leakage flowing from the power supply to the first switch The first digital potential meter and the second digital potential meter are controlled to have a point current of 0, so that the values of the first digital potential meter and the second digital potential are R _C1 and R _C2 , respectively. When the resistance is defined as R _S1 + R _S2 and the reference resistance is defined as R _S3 , the following equation by the bridge circuit law R _S1 + R _S2 = (R _C1 * R _S3 ) / R _C2 The heat pipe leak detection apparatus, characterized in that for measuring the resistance value of the sensing line in the steady state. delete When the leakage occurs, connecting the first switch to the insulation resistance and the current detector, shorting the second switch and the third switch, and opening the fourth switch to form a bridge circuit including the insulation resistance; Controlling the first digital potential meter and the second digital potential meter; Measuring a leakage point current flowing from the power supply to the insulation resistance and the first switch through the current detector; Determining whether the measured leakage point current is zero; When the measured leakage point current is 0, measuring the leakage position by the ratio of the value of the first digital potential meter and the value of the second digital potential meter calculated using the bridge circuit law; Heat pipe leak position measurement method. The method of claim 1, The variable resistor may have a mutual resistance value divided between the power supply unit and the ground unit at a point where a conductor line extending from the power supply unit to the ground unit side and a conductor connected to the A / D converter unit in the current detection unit meet. The heat pipe leakage detection apparatus, characterized in that the distribution is a digital potentiometer provided. The method of claim 10, Indirect measurement of the insulation resistance is such that the first switch connects the insulation resistance and the current detector, opens the second switch and the fourth switch, shorts the third switch, and distributes the digital. The potential meter is controlled to the maximum value on the power supply side and 0 on the ground side to measure the leakage point current flowing from the power supply to the insulation resistance and the first switch, and the measured leakage The point current is referred to as I _C , the voltage supplied from the power supply unit is referred to as V _C , the resistance between the power supply unit and the leaking position is referred to as a first sensing line resistance R _S1 , and the insulation resistance is R _P. In this case, since the first sensing wire resistance is relatively small compared to the insulation resistance, if R _P + R _{S 1} == R _P , R _P = V _C / I _C Heat pipe leakage detection apparatus, characterized in that for measuring the insulation resistance indirectly. The method of claim 11, Leakage position measurement, the first switch is connected to the insulation resistance and the current detection unit, the second switch and the third switch is short-circuited, the fourth switch is opened, the insulation resistance and The distribution digital potential meter is controlled so that the leakage point current flowing through the first switch becomes 0, and the resistance value of the power supply side and the ground side side of the distribution digital potential meter are respectively R _C1 and R _C2. If the resistance between the power supply and the leaking position is referred to as a first sensing line resistance (R _S1 ), and the resistance between the leaking position and the ground portion is defined as a second sensing line resistance (R _S2 ), Through the bridge circuit law R _S1 / R _S2 = R _C1 / R _C2 The heat pipe leakage detection apparatus, characterized in that for measuring the leak position. The method of claim 10, The first switch is connected to the end of the sensing line and the current detection unit, the second switch is open, the third switch and the fourth switch short-circuited, the leakage flowing from the power supply to the first switch The distribution digital potential meter is controlled so that the point current is 0, and the resistance value of the power supply side and the ground side side of the distribution digital potential meter are referred to as R _C1 and R _C2 , respectively. If the value is defined as R _S1 + R _S2 , and the reference resistance is defined as R _S3 , R _S1 + R _S2 = (R _C1 * R _S3 ) / R _C2 The heat pipe leak detection apparatus, characterized in that for measuring the resistance value of the sensing line in the steady state.

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