KR101991859B1 - short circuit and electric leakage detection apparatus for power cable - Google Patents

Abstract

The present invention relates to a short circuit and electric leakage detection apparatus for a distribution line comprising: a current sensor part installed to enclose a distribution line to output an induction current responding to a current flowing through the distribution line; a power supply part connected to a first branch terminal branching from an output terminal of the current sensor part to rectify a signal outputted by the current sensor part to generate driving power; a control unit having a control part operated by driving power supplied by the power supply part and connected to a second branch terminal branching from the output terminal of the current sensor part to output a sound signal through a corresponding speaker when a signal detected from the second branch terminal exceeds a set reference signal range; an optical fiber grating coupled to the speaker to be linked to vibration of a vibratory plate of the speaker to be relaxed and contracted, and provided with a grating; a light source to emit light; and a diagnosis unit to transmit the light emitted by the light source to the optical fiber grating, and detect light reversely propagating from the optical fiber grating to diagnose whether the distribution line on which the current sensor part is mounted is abnormal. According to the short circuit and electric leakage detection apparatus for a distribution line, whether an abnormality for a short circuit and an electric leakage of a distribution line exists can be transported through an optical fiber grating to improve signal transmission stability.

Description

Short circuit and electric leakage detection apparatus for power distribution line

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a short circuit and a short circuit measuring device of a distribution line, and more particularly, to a short circuit and a short circuit measuring device of a distribution line, through which measured information can be transmitted through an optical fiber grid.

The electricity produced by the power plant is transferred to the customer via distribution lines. The distribution line is composed of a metal core material having excellent electrical conductivity, such as copper, and a coating of synthetic resin material surrounding the periphery of the core material.

These power distribution lines are fixed to a fully-supported support, which is installed at the top of the pole to reduce the risk of electric shock because of the high voltage electricity flows. In addition, it is common for a large number of distribution lines to be secured to a fully-supported support to meet a large number of electrical demands.

Such a distribution line is installed at a high position, so it is not easy for human contact, but when the construction is carried out using various heavy equipment near the distribution line, it may come into contact with the distribution line due to the inadvertent operation of the heavy equipment, and in severe cases, it is difficult to fix the distribution line with the fully-supported support. It may be released. In addition, since the distribution line is fixedly installed at a high position, when the continuous force is applied to the distribution line due to a typhoon or strong wind, the fixing with the wrought iron support may be released. A plurality of distribution lines are fixed to the fully-supported support, and there is a problem that a short circuit may occur due to contact of a neighboring distribution line with the distribution line which has been released as described above. Such a short circuit may cause a lot of inconvenience due to the interruption of the electricity supply to the customer, there was also a risk of electric shock due to the fall of the un-fixed distribution line.

On the other hand, in the case of underground distribution lines installed in the ground, water droplets often form inside the pipe into which the underground distribution lines are inserted due to a change in temperature or inflow of moisture, and in this case, the underground distribution lines have a circumferential surface on the inner circumferential surface of the pipe. As it is in contact, water droplets generated inside the pipe are buried in the underground distribution line.

However, when water is on the surface of the underground distribution line for a long time, the deterioration of the coating is promoted, and the coating hardens or cracks, and a short circuit occurs when water is introduced through the crack generated in this way. .

In addition, when the underground distribution line and the underground distribution line are connected through the connection flange, moisture may penetrate into the gap between the underground distribution line and the connection flange, and a short circuit may occur between the underground distribution line and the underground distribution line due to the moisture.

In order to solve this problem, Patent Registration No. 10-1100969 discloses an apparatus for detecting disconnection of a distribution line and a method thereof.

However, the patent is a method of detecting whether the sensor is to detect the shock transmitted to the pole, it is difficult to precisely detect whether the disconnection, and even if an external shock is applied to the pole rather than a disconnection accident can be misleading There is a problem.

The present invention was devised to solve the above problems, and provides a short circuit and a short circuit measurement apparatus for a distribution line that can more accurately measure a short circuit and a short circuit of the power distribution line, and also improve the transmission and processing efficiency of the measured information. The purpose is.

In order to achieve the above object, a short circuit and an earth leakage measuring apparatus of a distribution line according to the present invention includes a current sensor unit which surrounds a distribution line and outputs an induced current corresponding to a current flowing through the distribution line; A power supply unit connected to a first branch end branched from an output end of the current sensor unit to rectify a signal output from the current sensor unit to generate driving power; When the signal detected from the second branch end is out of the set reference signal range by being connected to the second branch end branched from the output end of the current sensor unit, the sound signal is output through the corresponding speaker. A control unit having a control unit for processing the control unit; An optical fiber grating coupled to the speaker so as to be relaxed and contracted in association with vibration of the diaphragm of the speaker, the grating having an grating; A light source for emitting light; And a diagnostic unit which transmits the light emitted from the light source to the optical fiber grating, detects the light traveling backward from the optical fiber grating, and diagnoses the abnormality of the distribution line equipped with the current sensor.

According to an aspect of the present invention, the distribution line is a three-phase AC power source having an R-phase supply line, S-phase supply line and T-phase supply line is applied, the current sensor unit is the R-phase supply line, S-phase supply line and T-phase supply line A first current sensor applied to surround any one of the supply lines; A second current sensor applied to surround any one of the R-phase supply line, the S-phase supply line, and the supply line to which the first current sensor is not applied; And a third current sensor applied to surround the R phase supply line, the S phase supply line, and the T phase supply line, wherein the control unit comprises: a first speaker corresponding to the first current sensor; A second speaker corresponding to the second current sensor; A third speaker corresponding to the third current sensor; and the lattice spacing of the optical fiber gratings respectively mounted on the first to third speakers is different from each other, and the control unit is arranged on the first to third speakers. The frequency of each of the output sound signal is applied differently.

Preferably, the electronic device further includes a tension adjusting unit mounted on a frame supporting the diaphragm of each of the first to third speakers to adjust the tension applied to the optical fiber grid, and the tension adjusting unit is coupled to one end of the frame. A first vertical portion extending upward, a first upward inclined portion extending in a direction toward the center of the diaphragm at an upper end of the first vertical portion and gradually inclined so as to gradually increase in height, and the first upward inclined portion A first downward inclined portion extending from the top toward the center of the diaphragm to be inclined to gradually decrease in height, and having a first hinge hole formed therein, and a second vertical portion extending upwardly by being coupled to the other end of the frame; And extend in a direction toward the center of the diaphragm from the top of the second vertical portion, but gradually increase in height. A second upwardly inclined portion extending from the top of the second upwardly inclined portion and extending in a direction toward the center of the diaphragm, the first being gradually inclined so as to gradually decrease in height, and rotatably coupled to the first downwardly inclined portion; A rotating link member having a second downwardly inclined portion having a second hinge hole formed therein; A tightening bolt inserted through the first hinge hole of the first downward slope portion and the second hinge hole of the second downward slope portion; And a tightening nut screwed to the tightening bolt to adjust the adhesion between the first downward tilting portion and the second downward tilting portion, and an upper and lower vibration loads are respectively provided on the upper ends of the first and second upward tilting portions. A weight weight is formed to increase.

According to the short-circuit and the electric leakage measuring device of the distribution line according to the present invention, it is possible to transmit the presence or absence of the short circuit and the leakage of the distribution line through the optical fiber grating provides an advantage that can improve the signal transmission stability.

1 is a view showing a short circuit and an electric leakage measuring device of a distribution line according to the present invention,
2 is a perspective view illustrating an example of the current sensor of FIG. 1;
3 is a cross-sectional view of the speaker of FIG. 1,
Figure 4 is a cross-sectional view showing a coupling structure of the sensing optical fiber according to another embodiment of the present invention.

Hereinafter, a short circuit and an electrical leak measuring apparatus of a distribution line according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a short circuit and an electric leakage measuring device of a distribution line according to the present invention.

Referring to FIG. 1, the short-circuit and earth leakage measuring apparatus 100 of the distribution line according to the present invention includes a current sensor unit 110, a power supply unit 120, a control unit 130, and first to third optical fiber gratings 151 to 153. ), A light source 161, a diagnostic unit 170, and a management server 200.

The current sensor unit 110 is installed to surround the distribution line and outputs an induced current corresponding to the current flowing through the distribution line.

In the illustrated example, a three-phase AC exclusive distribution line having an R-phase supply line 23, an S-phase supply line 22, and a T-phase supply line 21 was used.

In addition, the current sensor unit 110 is applied to the first to third current sensors (110a) (110b) (110c).

The first current sensor 110a is installed to surround the T-phase supply line 21 and outputs an induced current corresponding to the current flowing through the T-phase supply line 21.

The second current sensor 110b surrounds the S-phase supply line 22 and outputs an induced current corresponding to the current flowing through the S-phase supply line 22.

The third current sensor 110c is provided to surround all of the T-phase supply line 21, the S-phase supply line 22, and the R-phase supply line 23, so that the T-phase supply line 21, the S-phase supply line 22, The induced current corresponding to the current flowing through the R-phase supply line 23 mode is output.

The first to third current sensors 110a, 110b, and 110c are rotatably coupled via the hinge 114 as illustrated in FIG. 2, but form a ring-shaped closed loop in the coupled state, and in the separated state. Winding coils wound and drawn on any one of the first and second pivotal ring caps 111 and 112 and the first and second pivotal ring caps 111 and 112 that are opened to insert the measurement target distribution line therein. It has a structure having (116).

Induction currents generated at both terminals of the winding coil 116 of FIG. 2 are wired to be distributed to the rectifier 121 and the filter unit 131 which will be described later. In order to avoid the complexity of the drawing, both terminals are equivalently disconnected in FIG. 1. Notation.

Cores made of a magnetic material are embedded in the first and second pivotal ring caps 111 and 112.

The power supply unit 120 is connected to the first branch terminals 117a, 117b, and 117c branched from the output terminals of the first to third current sensors 110a, 110b, and 110c, respectively. Driving power is generated from the signals output from (110a) (110b) and (110c).

The power supply unit 120 is connected to the first branch terminals 117a, 117b, and 117c branched from the output terminals of the first to third current sensors 110a, 110b, and 110c, respectively, to rectify the AC signal. 121 and a power generator 122 for converting the power rectified by the rectifier 121 into a voltage required by the driving element and supplying the voltage.

The control unit 130 is operated by the driving power supplied from the power generation unit 122 of the power supply unit 120.

The control unit 130 is connected to the second branch stages 118a, 118b and 118c branched from the output terminals of the first to third current sensors 110a, 110b and 110c to filter the input signal. The controller 131 includes an amplifier 133 that amplifies the signal filtered by the filter unit 131, and a controller 135 that receives the amplified signal and performs a diagnostic process.

In addition, the control unit 130 is controlled by the control unit 135 and outputs an audio signal, the first speaker 141 corresponding to the first current sensor 110a and the second corresponding to the second current sensor 110b. A third speaker 143 corresponding to the speaker 142 and the third current sensor 110c is provided.

The filter unit 131 removes noise, for example, high frequency signals, included in signals output from the first to third current sensor units 110a, 110b, and 110c, respectively.

The filter unit 131 may be omitted.

The control unit 135 compares the first to third reference signals set for each of the signals detected from the second branch stages 118a, 118b, and 118c via the filter unit 131 and the amplifier 133, If the signal is out of the range of the first to third reference signals, the sound signal is output through the corresponding first to third speakers 141 to 143.

That is, the controller 135 compares the first reference signal set with respect to the signal detected from the second branch terminal 118a through the filter unit 131 and the amplifier 133 with respect to the first current sensor 110a. If the first reference signal is out of range, the sound signal is output through the corresponding first speaker 141.

In addition, the controller 135 compares the second reference signal set with respect to the signal detected from the second branch end 118b through the filter unit 131 and the amplifier 133 with respect to the second current sensor 110b. If the second reference signal is out of range, the sound signal is output through the corresponding second speaker 142.

Similarly, the control unit 135 compares the third reference signal set with respect to the signal detected from the second branch end 118c through the filter unit 131 and the amplifier 133 with respect to the third current sensor 110c. If it is out of the three reference signal range, the sound signal is output through the corresponding third speaker 143.

Here, the first reference signal and the second reference signal may be set to the same value, and may be appropriately set according to the overcurrent for determining the abnormal current due to a short circuit.

In addition, the third reference signal may be appropriately set to determine whether leakage current is generated.

The controller 135 applies different frequencies of the acoustic signals output to the first to third speakers 141, 142, and 143.

The first to third speakers 141, 142, and 143 are controlled by the controller 135 to output sound signals.

What is necessary is just to apply a normal thing to the 1st-3rd speaker 141 (142, 143).

As an example, as shown in FIG. 3, the first to third speakers 141, 142, and 143 have a permanent magnet 140b seated on the yoke 140a, and the voice coil 140c is wound. One end of the bobbin 140d provided to be slid vertically has a structure coupled to the lower portion of the diaphragm 140e.

The other end of the diaphragm 140e is coupled to a frame 140f that is capable of supporting and supporting the elastic deformation of the diaphragm 140e.

The first to third optical fiber lattice 151, 152, 153 are formed to be spaced apart from each other in series on the sensing optical fiber 150.

Preferably, the lattice spacing of the first to third optical fiber grids 151, 152 and 153 respectively mounted on the first to third speakers 151, 152 and 153 is formed differently.

Each of the first to third optical fiber grids 151, 152, and 153 may be relaxed and contracted in cooperation with vibrations of the diaphragm 140e of the corresponding first to third speakers 141, 142, and 143. Are coupled to the first to third speakers 141, 142, 143.

The sensing optical fiber 150 is a first to third speakers 141 with a bonding material 147 such as epoxy so that the first to third optical fiber grids 151, 152 and 153 can be supported while maintaining an appropriate tension. 142 and 143 are bonded along the direction across the upper end of the frame 140f.

Meanwhile, a tension adjusting unit may be further provided to adjust the tension of the sensing optical fibers 150 to the first to third optical fiber grids 151, 152, 153 to adjust the vibration sensitivity at the time of sound output. An example will be described with reference to FIG. 4. Elements having the same function as in the above-described drawings are denoted by the same reference numerals.

The tension adjusting unit 200 is mounted on the upper end of the frame 140f supporting the diaphragm 140e of each of the first to third speakers 141, 142, and 143, and the first to third optical fiber gratings 151 ( The tension applied to the 152 and 153 can be adjusted.

The tension adjusting unit 200 includes a rotation link member 210, a tightening bolt 215, a tightening nut 217, and a weight 220.

Rotating link member 210 is coupled to the upper end of the frame (140f) to be able to vary the extension length.

The first link 211 and the second link 212 are rotatably coupled to each other in the pivotal link member 210.

The first link 211 is coupled to the upper end of the frame 140f and extends upward in the direction toward the center of the diaphragm 140e from the upper end of the first vertical portion 211a and the first vertical portion 211a. The first upwardly inclined portion 211b extended to be inclined to gradually increase in height, and extends toward the center of the diaphragm 140e from the upper end of the first upwardly inclined portion 211b, but is inclined to gradually decrease in height. The first downward inclined portion 211c extends and is formed to pass through the first hinge hole in a direction orthogonal to the extending direction.

The second link 212 is coupled to the other upper end of the frame 140f and extends upward in the direction toward the center of the diaphragm 140e at the upper end of the second vertical portion 212a and the second vertical portion 212a. The second upwardly inclined portion 212b extended to be inclined to gradually increase in height, and extends in the direction toward the center of the diaphragm 140e from the upper end of the second upwardly inclined portion 212b, but is gradually inclined to have a height gradually lowered. The second hinge hole which extends but can be rotatably coupled to the first downward slope portion 211c has a second downward slope portion 212c formed to penetrate in a direction perpendicular to the extension direction.

The tightening bolt 215 is inserted through the first hinge hole of the first downward slope portion 211c and the second hinge hole of the second downward slope portion 212c.

The tightening nut 217 is screwed to the tightening bolt 215 and the screw opposite the tightening bolt 215 based on the first hinge hole of the first downward slope portion 211c and the second hinge hole of the second downward slope portion 212c. Are combined.

The tightening bolt 215 and the tightening nut 217 may adjust the adhesion force associated with the rotational allowance of the first downward slope portion 211c and the second downward slope portion 212c.

The weight 220 is installed on the upper end of the first and second upwardly inclined portion (211b) (212b), respectively, to increase the vertical vibration load.

Weight 220 may be applied to have an appropriate weight to induce a desired vibration effect.

Meanwhile, in the illustrated example, the sensing optical fiber 150 is inserted through the distribution holes 213 and 214 formed to penetrate the first and second vertical portions 211a and 212a, and the bonding material 147 is bonded. .

Unlike this, the sensing optical fiber 150 may be bonded to the top of the frame 140f as shown in FIG. 3.

In addition, the first and second vertical portions 211a and 212a may be hinged to be rotatably coupled to one end and the other end of the frame 140f, respectively.

The light source 161 emits light.

The diagnostic unit 170 transmits the light emitted from the light source 161 to the sensing optical fiber 150 in which the first to third optical fiber gratings 151, 152 and 153 are formed, and the first to third optical fiber gratings ( 151, 152, and 153 detects the light traveling backward through the sensing optical fiber 150, and the R-phase supply line 23 on which the first to third current sensors 110a, 110b, and 110c are mounted. The diagnosis of abnormality of the S-phase supply line 22 and the T-phase supply line 21 is performed.

The diagnostic unit 170 includes an optical circulator 171, a light detector 173, a signal processor 175, and a communication unit 177.

The optical circulator 171 transmits the light incident from the light source 161 to the sensing optical fiber 150, and outputs the light traveling backward from the sensing optical fiber 150 to the photodetector 173.

The photo detector 173 converts the light incident from the optical circulator 171 into an electrical signal and outputs the electrical signal to the signal processor 175.

The signal processor 175 generates an abnormality and leakage current due to a short circuit or a disconnection between the R-phase supply line 23, the S-phase supply line 22, and the T-phase supply line 21 from the signal received by the photodetector 173. If it is determined that the abnormality has occurred, the diagnostic information is transmitted to the management server 200 through the communication unit 177.

In the signal processing unit 175, comparison reference information for determining whether there is an abnormality with respect to a signal received from the photodetector 173 and whether leakage current is generated is recorded in a lookup table, and a short circuit or Determine whether there is an abnormality or leakage current caused by disconnection.

The communication unit 175 is controlled by the signal processing unit 177 and transmits diagnostic information to the management server 200 through the communication network 10.

According to the short circuit and the electric leakage measuring device of the distribution line described above, it is possible to transmit the presence or absence of the short circuit and short circuit of the power distribution line through the optical fiber grating provides an advantage of improving the signal transmission stability.

110: current sensor unit 120: power supply unit
130: control unit
151 to 153: first to third optical fiber gratings
161: light source 170: diagnostic unit
200: management server

Claims (3)

delete A current sensor unit disposed to surround a distribution line and output an induced current corresponding to a current flowing through the distribution line;
A power supply unit connected to a first branch end branched from an output end of the current sensor unit to rectify a signal output from the current sensor unit to generate driving power;
When the signal detected from the second branch end is out of the set reference signal range by being connected to the second branch end branched from the output end of the current sensor unit, the sound signal is output through the corresponding speaker. A control unit having a control unit for processing the control unit;
An optical fiber grating coupled to the speaker so as to be relaxed and contracted in conjunction with vibration of the diaphragm of the speaker, the grating being formed with a grating;
A light source for emitting light;
And a diagnostic unit for transmitting the light emitted from the light source to the optical fiber grating, detecting the light traveling backward from the optical fiber grating, and diagnosing an abnormality of a distribution line equipped with the current sensor unit.
The distribution line is applied to a three-phase AC power source having an R-phase supply line, an S-phase supply line and a T-phase supply line,
The current sensor unit
A first current sensor applied to surround any one of the R-phase supply line, the S-phase supply line, and the T-phase supply line;
A second current sensor applied to surround any one of the R-phase supply line, the S-phase supply line, and the supply line to which the first current sensor is not applied;
And a third current sensor applied to surround all of the R-phase supply line, the S-phase supply line, and the T-phase supply line.
The control unit
A first speaker corresponding to the first current sensor;
A second speaker corresponding to the second current sensor;
And a third speaker corresponding to the third current sensor.
The lattice spacing of the optical fiber gratings respectively mounted on the first to third speakers is different from each other.
The control unit is short-circuit and electrical leakage measuring device of the power distribution line, characterized in that the frequency of each of the sound signal output to the first to third speakers are applied differently. The apparatus of claim 2, further comprising a tension adjusting unit mounted to a frame supporting the diaphragm of each of the first to third speakers to adjust the tension applied to the optical fiber grid.
The tension adjusting unit
A first vertical portion coupled to one end of the frame and upwardly extending, a first upward inclined portion extending from an upper end of the first vertical portion in a direction toward the center of the diaphragm and gradually inclined to a height; A first downward inclined portion extending in a direction toward the center of the diaphragm from an upper end of the first upward inclined portion and gradually inclined to have a height gradually lowered, and having a first hinge hole formed therein, and being coupled to the other end of the frame upward; An extended second vertical portion, a second upwardly inclined portion extending in a direction toward the center of the diaphragm from an upper end of the second vertical portion and gradually inclined so that its height is gradually increased; and at an upper end of the second upwardly inclined portion Extend in a direction toward the center of the diaphragm, the height of which is gradually inclined to be gradually lowered to the first downward slope portion. Turning link members having a second downwardly inclined portion of the second hinge hole, which can be rotatably coupled is formed with;
A tightening bolt inserted through the first hinge hole of the first downward slope portion and the second hinge hole of the second downward slope portion;
And a tightening nut screwed to the tightening bolt to adjust the adhesion between the first downward tilting portion and the second downward tilting portion.
Short circuit and leakage measurement apparatus of the power distribution line, characterized in that a weight added to increase the upper and lower vibration load respectively on the upper end of the first and second upward slope portion.

Images