KR20090050669A - Breakdown position detection apparatus for power transmission/power distribution cable line - Google Patents

Abstract

The present invention provides an accident position detection device for a transmission line. The accident location detecting apparatus for transmission and distribution lines includes a sensor unit for detecting current values flowing in a plurality of transmission and distribution lines and outputting them as voltage values, and a first signal for determining whether there is an abnormality in the line through voltage values output from the sensor units. And a processing unit, a second signal processing unit for outputting different signals according to polarities of currents flowing in the line, and a control unit for detecting an accident position by receiving electrical signals from the first signal processing unit and the second signal processing unit. By doing so, in case of a ground fault or a short circuit or a ground fault due to lightning, the transmission and distribution line can be miniaturized so that the position of the accident can be accurately identified and its size can be installed in the ball sensor installed on the side of the track.

Description

Accident location detection device for transmission and distribution lines {BREAKDOWN POSITION DETECTION APPARATUS FOR POWER TRANSMISSION / POWER DISTRIBUTION CABLE LINE}

The present invention relates to an accident location detecting apparatus for transmission / distribution lines, and more particularly, when the transmission / distribution line is grounded or short-circuited or a ground fault occurs due to a lightning strike, the location of the accident is accurately identified and its size is determined. The present invention relates to an accident position detecting device for a transmission / distribution line that can be miniaturized to be installed on a ball sensor installed at a line side.

In general, transmission and distribution lines, especially power transmission lines, are electric power facilities for supplying electric power generated from power plants to subregions through power substations. In modern society, accidents of transmission facilities are directly connected to long-term power supply interruption. It will also have a significant impact.

On the other hand, transmission lines installed on the ground are supported by transmission towers installed at predetermined distances, and these transmission lines are widely installed throughout the region, and thus are exposed to dangers such as wind, snow, rain, and lightning.

In addition, most of the accidents in the transmission line are caused by grounding or short-circuit due to unexpected factors or by lightning strikes on the transmission tower, and most of them are damaged by lightning strikes. In order to prevent accidents, preventive measures such as instantaneous checks are required.

In addition, when a transmission line is shorted due to the above-mentioned lightning accident, a large amount of current flows in the transmission line several times to several tens of times of load current, which weakens the tension of an electrical device such as a booster installed in the transmission tower and causes abnormal operation of the corresponding electric device. Cause.

Therefore, if a ground fault, short circuit or lightning strike occurs in the transmission tower, it is necessary to take appropriate measures such as detecting the power supply promptly and stopping the electricity supply in the failure section. For this purpose, an accident section detection device was installed to cope with the accident.

1 is a view showing an accident section detection apparatus of a conventional overhead transmission line.

As shown in the figure, a plurality of transmission towers 10 are formed to support the transmission line 20, the current converter 30 is installed on the transmission line 20, by the current converter 30 A transmission device 40 for storing and transmitting the detected current is formed.

The transmission line 20 is composed of a processing branch line 22 passing through the upper end of the transmission tower 10 and the overhead transmission line 24 passing through the middle upper portion, the current converter 30 is installed in the processing branch line 22. do.

In addition, the transmission device 40 is installed to store the current detected by the current converter 30 at a predetermined position of the transmission tower 10 and transmit the stored current to the central control unit 50.

When a receiver (not shown) is formed in the transmitter 40 and an abnormal current is generated, the transmitter 40 measures the time and transmits the measured time to the central controller 50.

In addition, the central controller 50 measures a ground fault or a shorted section of the transmission line 20 based on the waveform of the current transmitted from the transmitter 40 and the time measured by the receiver.

However, the current converter 30 is difficult to detect an accident section when a current larger than the design flows in the processing branch line 22 due to the hysteresis characteristics of the iron core, and detects a high frequency current generated at a moment such as a lightning strike. There was a problem that could not be.

In addition, since the detection device sends a signal when a current generated by an accident is detected, there is a problem in that a section between two transmission towers in which the detection device is installed has to be inspected.

The present invention has been made to solve the above problems, the first object of the present invention is to detect the current flowing in the transmission or distribution line to accurately measure the accident section and accident location due to ground fault or short-circuit accident and lightning accident It is to provide an accident location detection device for transmission and distribution lines.

The second object of the present invention is to reduce the size of the Rogowski coil by applying a Rogowski coil so that it can be installed on the four parts of the ball sensor directly installed on the power transmission or distribution line, and the current of the transmission or distribution line inside the ball sensor. An object of the present invention is to provide an accident position detecting device for a transmission line.

The present invention provides an accident position detecting device for transmission and distribution lines in order to achieve the above object.

The accident location detecting apparatus for transmission and distribution lines includes a sensor unit for detecting current values flowing in a plurality of transmission and distribution lines and outputting them as voltage values, and a first signal for determining whether there is an abnormality in the line through voltage values output from the sensor units. And a processing unit, a second signal processing unit for outputting different signals according to polarities of current values flowing in the line, and a control unit for receiving an electrical signal from the first signal processing unit and the second signal processing unit to detect an accident location. do.

Here, the sensor unit is preferably made of Rogowski coil.

The first signal processor may determine whether there is an abnormality in the voltage value by comparing an integrator for selectively detecting a voltage value output from the sensor unit and a voltage value detected from the integrator with a preset reference voltage value. It is preferable to have a comparator for outputting different current signals.

Here, the integrator may include a first integrator configured to transform a voltage value detected by a normal among the detected voltage values of the sensor unit into a normal current waveform, and an accident current waveform based on an accidentally detected voltage value among the detected voltage values of the sensor unit. It is preferably made of a second integrator formed to deform.

In addition, the second signal processing unit outputs a different signal according to the polarity of the surge integrator and the surge current value formed by the surge integrator formed to transform the voltage value detected by the lightning among the detected voltage value of the sensor unit into a surge current waveform. It is preferable to have a polar discriminator.

Here, the polarity discriminator is configured to output a 'positive' signal in accordance with the polarity of the current value detected in the surge integrator, and to output a 'negative' signal in accordance with the polarity of the current value detected in the surge integrator. It is preferable that it consists of the formed 2nd polar discriminator.

In addition, the Rogowski coil preferably has a cross-sectional diameter of 10 mm or less.

The present invention has the effect of accurately measuring the accident section and the location of the accident due to ground fault or short circuit accident and lightning accident by detecting the current flowing in the transmission or distribution line.

In addition, the present invention is to reduce the size of the Rogowski coil to be installed on the four parts of the ball sensor directly installed on the transmission or distribution line and to measure the current of the transmission or distribution line inside the ball sensor. Has the effect.

Hereinafter, an accident position detecting apparatus for a transmission line according to an embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a perspective view showing a sensor unit according to the present invention. 3 is a block diagram showing a first signal processor according to the present invention. 4 is a block diagram showing a second signal processor according to the present invention.

2 to 4, the accident position detection apparatus for a transmission line according to the present invention includes a sensor unit 100 mounted inside an apparatus such as a ball sensor (not shown) disposed on a line (not shown). Equipped.

The sensor unit 100 may be formed of a Rogowski coil. As shown in FIG. 2, the Rogowski coil is provided with a body 110 having a predetermined length, a first fastening part 111 having an outer diameter D of 100 mm at one end of the body 110, and the It is provided at the other end of the body 110 and has an inner diameter (d) of 80mm and is fitted to the first fastening portion 111 and has a second fastening portion 112 clamped.

Therefore, the cross-sectional thickness t1 of the first fastening part 111 and the cross-sectional thickness t2 of the second fastening part 112 may be manufactured to be 10 mm or less. The Rogowski coil may be electrically connected to the sensor cord 120.

In addition, the sensor unit 100 may detect a current value flowing in a plurality of transmission and distribution lines and output the voltage value.

In addition, the sensor unit 100 is electrically connected to the first signal processing unit 200.

As illustrated in FIG. 2, the first signal processor 200 may determine whether there is an abnormality in the line through the voltage value output from the sensor unit 100.

The first signal processor 200 compares the integrator 210 selectively detecting the voltage value output from the sensor unit 100 with the voltage value detected from the integrator 210 with a preset reference voltage value. In addition, the comparator 220 may determine whether there is an abnormality in the voltage value and output the different current signals.

Here, the integrator 210 is a first integrator 211 formed to transform the voltage value detected by the normal of the detected voltage value of the sensor unit 100 to the normal current waveform, and the detection of the sensor unit 100 The second integrator 212 is configured to transform the voltage value detected by the accident among the voltage values into the fault current waveform.

Therefore, the voltage value detected and output from the sensor unit 100 passes through the preamplifier 201 and is transmitted to the first and second integrators 211 and 212.

Each of the first and second integrators 211 and 212 selectively detects a voltage value among the detected voltage values. The detected voltage value is determined by the comparator 220 to determine whether it is equal to the reference voltage value.

Therefore, when the voltage value detected by the normal is the same as the reference voltage value, since the normal current value, the first integrator 211 may transform the normal current waveform and output it to the outside.

In addition, when the voltage value detected by the accident is not the same as the reference voltage value, since the fault current value, the second integrator 212 may transform the fault current waveform and output it to the outside.

For example, the first and second integrators 211 and 212 may be transmitted to an external controller 500 or a display (not shown). Therefore, the controller 500 may detect the fault current waveform, and the display may visually identify the fault current waveform.

On the other hand, referring to Figure 4, the accident position detection apparatus for a transmission line according to the present invention is the second signal processing unit 300 for outputting different signals according to the polarity of the current value flowing in the line and the first signal processing unit ( 200 and a control unit 500 for receiving an electrical signal from the second signal processing unit 300 to detect an accident location.

The second signal processor 300 may include a surge integrator 310 and a surge integrator 310 configured to transform a voltage value detected by a lightning strike among the detected voltage values of the sensor unit 100 into a surge current waveform. The polarity discriminator 320 outputs a different signal according to the polarity of the surge current value.

The polar discriminator 320 may include a first polar discriminator 321 configured to output a 'positive' signal according to the polarity of the current value detected by the surge integrator 310 and the surge integrator 310. The second polarity discriminator 322 may be configured to output a negative signal according to the polarity of the current value.

Therefore, the voltage value detected and output from the sensor unit 100 passes through the preamplifier 301 and is transmitted to the surge analyzer 310.

The surge analyzer 310 transmits the detected voltage value to the first polar discriminator 321 and the second polar discriminator 322, respectively.

The first polar discriminator 321 may output a 'positive' signal according to the polarity of the current value detected by the surge integrator 310, and the second polar discriminator 322 may output the surge integrator 310. In accordance with the polarity of the current value detected in the) 'negative' signal can be output. Therefore, when a negative signal is output from the signal of the second polar discriminator 322, the output 'negative' signal is transmitted to the control unit 500, and the control unit 500 transmits the 'negative' signal. The position of the generated line can be detected.

Of course, the controller 500 may further include a display to visually display the detected position.

1 is a view showing an accident section detection apparatus of a conventional transmission line.

2 is a perspective view showing a sensor unit according to the present invention.

3 is a block diagram showing a first signal processor according to the present invention.

4 is a block diagram showing a second signal processor according to the present invention.

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

100: sensor 110: body

111: first fastener 112: second fastener

200: first signal processor 210: integrator

220: comparator 300: second signal processing unit

310: surge integrator 320: polarity discriminator

Claims (5)

A sensor unit which detects current values flowing in a plurality of transmission and distribution lines and outputs them as voltage values; A first signal processor which determines whether there is an abnormality in the line based on a voltage value output from the sensor unit; A second signal processor outputting different signals according to polarities of current values flowing in the line; And And a control unit for receiving an electrical signal from the first signal processing unit and the second signal processing unit to detect an accident position. The method of claim 1, The sensor unit accident position detection device for transmission and distribution line, characterized in that consisting of Rogowski coil. The method of claim 1, The first signal processor may compare an integrator for selectively detecting a voltage value output from the sensor unit, and compare the voltage value detected from the integrator with a preset reference voltage value to determine whether there is an abnormality in the voltage value. Comparators for outputting a current signal, The integrator includes a first integrator configured to transform a voltage value detected by a normal among the detected voltage values of the sensor unit into a normal current waveform, and a voltage value detected by an accident among the detected voltage values of the sensor unit into a fault current waveform. Accident position detection device for a transmission line, characterized in that consisting of a second integrator formed to. The method of claim 1, The second signal processor is a polarity outputting a different signal according to the polarity of the surge integrator and the surge current value formed by the surge integrator formed to transform the voltage value detected by the lightning among the detected voltage value of the sensor unit Have a discriminator, The polar discriminator may include a first polar discriminator configured to output a 'positive' signal according to the polarity of the current value detected in the surge integrator, and a first polar discriminator configured to output a 'negative' signal according to the polarity of the current value detected in the surge integrator. Accident position detection device for transmission and distribution line, characterized in that consisting of a two-pole discriminator. The method of claim 2, The Rogowski coil has an accident position detecting device for a transmission line, characterized in that the cross section diameter is 10mm or less.

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