KR101539398B1 - Remotely controlled magnetic sensing type line fault indicator - Google Patents

Abstract

The present invention provides a remotely-controlled, magnetically-sensitized cable line fault indicating device, and a cable line fault detecting method using the same which can sense a magnetic field change around a wiring line without a current transformer (CT) for detecting current to detect a fault. The remotely-controlled, magnetically-sensitized cable line fault indicating device according to the present invention comprises: a body installed around an electric cable and separated from the electric cable; an induction voltage detection plate mounted on the body to remotely detect an induction voltage around the electric cable; a magnetic sensor to remotely detect a magnetic field value around the electric cable; a fault indicating device to indicate whether a fault occurs to the outside when a faulty current occurs on the electric cable; and a control panel to convert the magnetic field value detected by the magnetic sensor into a current value, operate the fault indicating device if the current value is higher than or equal to a prescribed value, and automatically stop operation of the fault indicating device if an induction voltage is detected around the electric cable by the induction voltage detection plate, or a load current flowing through the electric cable is detected by the magnetic sensor.

Description

Technical Field [0001] The present invention relates to a remotely sensed line fault indicator,

[0001] The present invention relates to a line fault indication apparatus and a method for detecting a line fault using the same, and more particularly,

Load current that is proportional to the load always flows in the electric wire that supplies electric power to the electric power supply, that is, the wiring wire. However, if a short circuit or a ground fault occurs in the electric wire, a fault current larger than the load current flows in the electric wire.

This fault current is determined by the short-circuit capacity of the power system. If the fault current is left unattended, it may cause damage to the equipment and personal injury. Therefore, in the power system, there is a breaker which blocks the fault current, A display 140 and the like are installed and operated.

In general, the system configuration of the wiring line is mostly in the radial (dendrite) system in which power is only on one side and there are many branch circuits on the line. Therefore, in order to quickly find out the accident occurrence point, A switch or a fault section indicator is installed.

Conventional fault indicators and line breakers measure the current flowing through the wire to detect faults and determine that the fault is caused by overcurrent flowing above a constant current.

In this conventional system, although the reliability of fault detection is good, a CT (current transformer) for current detection is required, and therefore, it has been difficult to install the wiring while maintaining the uninterrupted state in the wiring line in operation. Phase and C-phase lines, respectively, so that the installation cost is set to be high.

Korean Patent No. 10-0334428 Korea Patent No. 10-0777209

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a line fault indication apparatus and a line fault detection method using the same, which can detect a failure by sensing a change in a magnetic field around a wiring line without using a current detecting CT The purpose is to provide.

According to an aspect of the present invention, there is provided a remote-magnetic-field-sensitive line fault indicator comprising: a body spaced around a wire; An induced voltage detector installed in the body to remotely detect an induced voltage around a wire; A magnetic field sensor for detecting a magnetic field value around the electric wire remotely; A fault indicator for indicating a fault to the outside when a fault current is generated in the electric wire; Wherein the control unit converts the magnetic field value detected by the magnetic field sensor into a current value and activates the failure indicator when the current value is equal to or greater than a predetermined value and detects an induced voltage around the electric wire through the induced voltage detection publication, A control panel for automatically stopping the operation of the failure indicator when a load current is detected to flow through the wire; .

A signal amplification circuit for amplifying the induced voltage when the induced voltage detection circuit detects the induced voltage; .

An operation current adjustment switch for adjusting an operation current value; A separation distance adjustment switch having a separation distance adjustment function to maintain a constant operation current value set by the operation current adjustment switch according to a distance between the electric wire and the body; .

A line length selection switch for adjusting the change of the long line in order to maintain a constant operation current value according to the entire length of the electric wire; .

A solar panel bracket having a ball joint connection structure with both ends rotatable 360 degrees and having one end mounted on the body 100; A solar cell unit mounted on the other end of the solar panel bracket for generating electricity using solar energy to charge the battery; .

The fault indicator comprises a LED blinking light or a lever operation indicator, and the LED blinking light is controlled by the control panel and blinks in blue and red when a fault occurs.

The lever operation indicator is installed outside the body, and is controlled by the control panel and rotated at a predetermined angle when a failure occurs.

In order to attain the above object, a method of discriminating a line fault of a remote magnetic field-sensitive fault indicator according to the present invention comprises detecting a magnetic field value around a wire remotely through a magnetic field sensor, When the value converted to the line current value increases by more than a certain value, it is judged that the line is broken by using the difference between the value and the minimum value.

As described above, the magnetic-field-sensitive line fault indicator and the line fault detection method using the same according to the present invention have the following effects.

It is not necessary to install the conventional CT by detecting the change of the magnetic field around the electric pole to detect the failure, and it is also possible to use a single detector It is possible to detect all the failures of the three-phase line and the single-phase line, thereby generating an economical effect.

In addition, the initial single-phase distribution line can be used without additional replacement even when a facility is to be installed with a three-phase wiring line due to a subsequent increase in load.

FIG. 1 is a block diagram showing a structure of a line-fault indicator of a remote magnetic field sensing type according to an embodiment of the present invention;
Fig. 2 is a waveform diagram showing a state in which a fault current waveform of a general wiring line is offset; Fig.
FIG. 3 is a diagram showing a state in which a line-fault indicator of a remote magnetic field sensing type according to an embodiment of the present invention is installed on a wiring line,
4 is an explanatory view showing the magnitude of the magnetic field intensity of the built-in longitudinal axis -A,
5 is an explanatory view showing the magnitude of the magnetic field strength of the built-in longitudinal bore,
Fig. 6 is an explanatory view showing magnitude of intensity of a magnetic field in a single field,
7 is a side view of a solar cell unit of a line fault indicator of a remote magnetic field sensing type according to an embodiment of the present invention.

FIG. 1 is a block diagram showing a structure of a line fault indicator of a remote magnetic field sensing type according to an embodiment of the present invention. FIG. 2 is a waveform diagram showing a state in which a fault current waveform of an ordinary wiring line is offset. FIG. 4 is an explanatory view showing the magnitude of the magnetic field strength of the built-in longitudinal axis -A, and FIG. 5 is a view showing the magnitude of the magnetic field strength of the built-in longitudinal axis-B And FIG. 6 is an explanatory view showing the magnitude of the magnetic field strength in the single short-circuit. FIG. 7 is a side view showing the solar cell unit of the line-fault indicator of the remote magnetic field sensing type according to the embodiment of the present invention.

1 to 7, a remote magnetic field sensitive line fault indicator according to an exemplary embodiment of the present invention includes a body 100, a magnetic field sensor 110, an induced voltage detector 120, a signal amplifier 130, A failure indicator 140, a control panel 150, an operation current adjustment switch 160, a separation distance adjustment switch 170, a line selection switch 180, a solar panel bracket 210 and a solar cell unit 220 .

The body 100 has a case function in which various components are mounted, and is installed at a predetermined interval in the vicinity of the wires of the wiring lines, not directly mounted on the wires for wiring lines.

For example, the body 100 is installed on the electric pole S of the wiring line as shown in FIG.

Various components such as the control panel 150 are mounted on the body 100.

The magnetic field sensor 110 is mounted on the control panel 150 mounted on the body 100 to detect a magnetic field around the electric wire remotely.

Since the magnetic field value increases proportionally as the current value flowing through the electric wire increases, it is possible to convert a current value increased to a magnetic field value when a fault current, that is, an overcurrent flows.

The method of converting the magnetic field value into the current value will be described in more detail in the description of the control panel 150.

The failure indicator 140 is mounted on the body 100 and is connected to the control panel 150 and operates when a fault current is generated in the electric wire to indicate whether the fault is external or not.

Specifically, the fault indicator 140 includes an LED indicator 141 and a lever-type indicator 142.

When a fault current is generated in the electric wire, the LED indicator 141 is composed of a red lamp and a blue lamp and alternately flashes to inform the outside of the failure.

The LED indicator 141 is installed to be exposed outside the lower end of the body 100 and blinks for a predetermined time, for about 3 hours, to indicate that the wiring line is in a failure state.

The lever-type indicator 142 rotates at an angle of about 90 degrees when a fault current is generated in the electric wire, thereby informing the outside of the fault.

The failure indicator 140 may include the LED indicator 141 and the lever indicator 142 so that when the LED indicator 141 fails or the exterior of the LED indicator 141 is bright, It is possible to determine whether or not a failure has occurred through the display device 142, thereby causing an effect of facilitating failure and grasp.

The induction voltage detector 120 is mounted on the body 100 and is connected to the control panel 150 to be described later to detect an induced voltage around a wire remotely.

Specifically, when an induced voltage is detected in the induction voltage detector 120, the voltage is amplified through the signal amplifier circuit 130 and the control panel 150 senses the induced voltage. .

Here, when the induced voltage detection signal lasts for at least 2 minutes, it is judged that the state of the wiring line is normal.

The induced voltage detector 120 detects the voltage of the line when the faulty line is automatically recovered to a normal state to stop the blinking of the LED indicator 141 or to reduce the angle of the lever- It is used to control the outside to know that it is in a steady state by rotating 90 degrees clockwise.

Of course, the load current of the electric wire can be measured by the magnetic sensor 110. However, even if the load is in a normal state, the load current of the line is small or the magnetic field intensity is very weak like the no- It is preferable to use the induced voltage detection plate 120 in parallel.

Meanwhile, the control panel 150 converts the magnetic field measured by the magnetic field sensor 110 into a current value, and determines that the wiring line is broken if the current value is greater than a predetermined value, and operates the failure indicator 140.

Generally, a current flowing through a distribution line is an alternating current, and therefore has a natural frequency (Hz). As shown in FIG. 3, the direction of current changes in a positive and reverse manner by a natural frequency, .

On the other hand, since the impedance value of the distribution line is larger than the resistance value of the reactance value, the fault current waveform at the beginning of the accident appears offset as indicated by a chain double-dashed line in FIG.

As a result, the magnetic field sensor 110 for measuring the magnetic field intensity receives a current waveform as shown in FIG. 2 and is influenced by the initial offset, so that the magnetic field due to + iF is measured largely and the magnetic field with respect to iF is measured very little do.

Therefore, the magnetic field sensor 110 measures a magnetic field strength by a pure fault current, that is, the magnetic field strength by the current value IF in the absence of an offset, so that a lot of errors occur depending on the phase angle of an accident. A lot of errors occur and practicality is lost.

In other words, the load current flowing at all times is an offset-free current, and the magnetic field sensor 110 should not be influenced by the offset of the fault current since the fault current and the offset value are quantitatively calculated and adjusted.

Therefore, in the embodiment of the present invention, although the fault current is offset, the amplitude is converted into the fault current value by calculating the amplitude by the following equation 1, taking into account that the magnitude of the amplitude of the fault waveform is not changed.

(1) IF = k (Hmax-Hmin) / 2

IF: Fault current rms value

k: current conversion factor

Hmax: maximum value of magnetic field measurement

Hmin: Minimum value of magnetic field measurement

That is, the control panel 150 determines whether a fault current is generated by converting the magnetic field measured by the magnetic field sensor 110 into a current value according to the equation (1).

Meanwhile, the operation current adjustment switch 160 controls the operation current value, and the control panel 150 operates with the operation current value set by the operation current adjustment switch 160.

Here, as shown in FIG. 2, the wiring lines are operated by being guided with a certain distance between the wires in a predetermined pattern according to the installation environment. As shown in FIGS. 4 to 6, Chang-Ju and Byeon-shang-chung.

Therefore, in each case, the distances from the A phase, the B phase, and the C phase wire are different from each other. Therefore, the magnetic field strength Ha, Hb, and Hc influenced by each phase in the same three- And thus become different from each other.

More specifically, as shown in FIG. 4, the magnetic field intensity is Hb> Hc> Ha in the case of the built-in long axis -A and the magnetic field intensity is Hb> Ha and Ha = Hc And as shown in FIG. 6, the magnetic field intensity changes to Ha > Hb >

Therefore, in the embodiment of the present invention, the line longitudinal selection switch 180 is provided to detect the same fault current even when the long period pattern is changed, so that the operation current value of the fault indicator 140 adjusted by the operation current adjustment switch 160 Is adjusted to be constant in any case.

That is, the control line 150 is controlled by the line length selection switch 180 so as to apply a coefficient according to the following equation (2), so that the same operation current value is calculated.

(2) IF (operating current) = D * F * k (Hmax-Hmin) / 2

D: correction factor according to separation distance

F: coefficient according to the selection

k: current conversion factor

Hmax: maximum value of magnetic field measurement

Hmin: Minimum value of magnetic field measurement

Meanwhile, as shown in FIG. 3, the magnetic field sensor 110 according to the present invention exhibits different effects depending on the distance D between the remote-magnetic-field-sensitive fault indicator 140 and the electric wire.

That is, as the distance increases, the strength of the magnetic field weakens. Therefore, the remote-magnetic-field-sensitive line fault indicator of the present invention and the line fault detection method using the remote-field-sensitive line fault indicator according to the present invention are capable of detecting So that the correction was made.

That is, when the magnetic field value is converted into the current value in the control panel 150, the correction factor corresponding to the separation distance set in the separation distance adjustment switch 170 is calculated as in the calculation formula 2).

The solar panel bracket 210 is disposed on the upper portion of the body 100 and connected to the solar cell unit 220 to be described later so that the solar panel bracket 210 can rotate 360 degrees.

Specifically, the solar panel bracket 210 is formed in a vertically long rod shape, and has an upper and a lower ball joint structure. The lower end of the solar panel bracket 210 is mounted on the body 100 and the solar cell unit 220 ).

The solar panel bracket 210 allows the solar panel of the solar cell unit 220 to be directed to the south in any circumstance and to maintain a constant solar angle (38.2 degrees in the central region), thereby enabling efficient electricity generation.

The solar cell unit 220 is for charging the power supply battery of the control panel 150 and is connected to the solar panel bracket 210 so as to be rotatable 360 degrees so as to generate electricity in an environmentally friendly manner, So that the magnetic-field-sensitive line fault indicator 140 can be operated without a separate power supply.

As described above, the remote-field-sensitive line fault indicator and the line fault detection method using the same according to the embodiment of the present invention can be installed not only directly on the wire but also around the wire, It is not necessary to install a conventional CT by detecting the change of the magnetic field to determine the failure, and it is possible to detect all the failures of the three-phase line and the single-phase line by one detector, and economical effect is generated.

In addition, the initial single-phase distribution line can be used without additional replacement even when a facility is to be installed with a three-phase wiring line due to a subsequent increase in load.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims something to do.

100: body 110: magnetic field sensor
120: Induction voltage detection circuit 130: Signal amplification circuit
140: Fault indicator 141: LED indicator
142: lever type indicator 150: control panel
160: Operation current adjustment switch 170: Separation distance adjustment switch
180: Line selection switch 210: Solar panel bracket
220: Solar cell unit

Claims (8)

A body spaced around the wire;
An induced voltage detector installed in the body to remotely detect an induced voltage around a wire;
A magnetic field sensor having a function of detecting a magnetic field value around the electric wire remotely and detecting a wire electric current;
A fault indicator for indicating a fault to the outside when a fault current is generated in the electric wire;
A magnetic field sensor mounted on the body for converting a magnetic field value detected by the magnetic field sensor into a current value and for activating the fault indicator when the current value is equal to or greater than a predetermined value, A control panel for automatically stopping the operation of the fault indicator when a voltage is detected or a load current flows through the electric wire by the magnetic field sensor; Wherein the line fault indicator is a line fault indicator. The method according to claim 1,
A signal amplification circuit for amplifying the induced voltage when the induced voltage detection circuit detects the induced voltage; Further comprising a line fault indicator for indicating a fault in the line. The method according to claim 1,
An operation current adjustment switch for adjusting an operation current value;
A separation distance adjustment switch having a separation distance adjustment function to maintain a constant operation current value set by the operation current adjustment switch according to a distance between the electric wire and the body; Wherein the line fault indicator is a line fault indicator. The method of claim 3,
A line length selection switch for adjusting the change of the long line in order to maintain a constant operation current value according to the entire length of the electric wire; Wherein the line fault indicator is a line fault indicator. The method according to claim 1,
A solar panel bracket having a ball joint connection structure with both ends rotatable 360 degrees and having one end mounted on the body 100;
A solar cell unit mounted on the other end of the solar panel bracket for generating electricity using solar energy to charge the battery; Further comprising a remote magnetic field sensitive line fault indicator. The method according to claim 1,
Wherein the failure indicator comprises a LED blinking light and the LED blinking light is controlled by the control panel to blink in blue and red when a failure occurs. The method according to claim 1,
Wherein the failure indicator comprises a lever-type lever operation indicator, the lever operation indicator is installed outside the body, and is controlled by the control panel when the failure occurs and is rotated at a constant angle. A method for detecting a line fault of a remote magnetic field sensitive fault indicator, the method comprising the steps of: detecting a magnetic field value around a wire remotely through a magnetic field sensor provided on a control panel;
Wherein the control panel determines that the line is broken when a value converted into a line current value is increased by a predetermined value or more using a difference between a maximum value and a minimum value of the magnetic field value detected by the magnetic sensor.

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