KR101454121B1 - A detection device of leakage current for deterioration diagnosis of DC lightning arresters - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a leakage current detection apparatus for diagnosing deterioration of a DC arrester, and is configured on a DC line to which a DC surge arrester is connected, A measurement line formed on the measurement line, the measurement line having one end connected to the upper ground terminal of the ground unit and the other end connected to the lower ground terminal; A microprocessor (MPU) connected to the measurement line for measuring a potential difference (V _{1 -2} ) between _one end and the other end of the measurement line to detect leakage current (I) of the DC surge arrester; A measurement line, a measurement impedance, a microprocessor, and a case including a power supply unit. The power supply unit supplies power to the ground,
It is possible to continuously detect the leakage current flowing in the DC arrester in the normal operation state of the DC arrester without conversion of the measurement mode (normal mode, test mode) as in the conventional leakage current measuring device, If the overvoltage is generated, the gap (gap) of the grounding part will flash and the discharge current can be discharged to the earth, so that even if surge or overvoltage occurs, it is possible to stably prevent damage or breakage of the measuring device It is effective.
Furthermore, even if a part of the overvoltage is introduced into the measurement line, it can be clamped to a safe voltage through the overvoltage protection circuit, thereby enhancing the structural safety and securing the versatility of the apparatus.

Description

TECHNICAL FIELD [0001] The present invention relates to a detection device for detecting a leakage current for DC lightning arresters,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leakage current detector for deterioration diagnosis of a DC arcing device, and more particularly, to a leakage current detector for detecting a DC leakage current in a normal operation state of a DC arrester, It is possible to continuously detect the leakage current flowing through the lightning arrester, thereby making it convenient to use the device, and also, when a surge or an overvoltage occurs, a gap (gap) The present invention relates to a leakage current detector for deterioration diagnosis of a DC arrester capable of stably preventing damage or breakage of a measuring device even when a surge or an overvoltage occurs.

Generally, lightning arresters are one of the important power devices that protects transmission lines, generators, transformers, etc. by absorbing electrical energy such as brain surges, open / close surges, and transient overvoltages that invade the power system.

In particular, zinc oxide (ZnO) lightning arresters can eliminate series gaps due to their excellent nonlinear resistance characteristics, resulting in a compact structure, convenient manufacturing process, very fast response time to transient voltage, no transient phenomena, It is widely used in power systems.

When the lightning arrester is deteriorated due to aging or an overvoltage intrusion, the resistance leakage current of the lightning arrester is increased to raise the temperature of the zinc oxide element, which in turn increases the leakage current and ultimately causes a ground fault .

Therefore, it is an important factor to prevent an accident of the power system due to deterioration by detecting the increase of the resistance leakage current of the lightning arrester and checking the deterioration progress state of the lightning arrester and determining the replacement time of the lightning arrester.

A technique for measuring the resistance leakage current of a zinc oxide (ZnO) lightning arrestor is disclosed in Korean Patent Registration No. 10-035664 entitled " Leakage Current Measurement Device for Portable Arrester and Leakage Current Measurement Method for Arrester ", and Registration No. 10-0498927 And a method and an apparatus for measuring a resistive leakage current using a time delay synthesis method in diagnosis of deterioration of lightning arresters, etc. However, the above conventional techniques are technologies related to leakage current detection of an AC surge arrester, The leakage current flowing through the DC surge arrester can not be detected by the above-described technique because a current transformer based on an electromagnetic induction law for detecting the resistance leakage current flowing in the DC surge arrester can not be applied.

In order to solve the above problems, a zinc oxide (ZnO) lightning arrester (1) in which one terminal is connected to a DC line as shown in FIG. 1 so as to detect a leakage current of the DC arcing device, A memory switch box 2 in which a switch terminal S is switchably connected between a normal terminal N and a test terminal T on the other terminal of the ZnO lightning arrester 1, A shunt resistor 3 connected to the test terminal T of the box 2, a control measuring section 4 connected to the memory switch box 2 and the shunt resistor 3, A "leakage current measuring device for a direct current surge arrester (Korean Registration No. 10-0972004)" including a computer 5 connected to the measuring portion 4 via a network has been developed.

That is, in the above-mentioned "Leakage current measuring device for direct current surge arrester (Korea patent registration number: 10-0972004)", in the normal mode, the control measuring part 4 judges that the switch terminal S of the memory switch box 2 is normal The switch terminal S of the memory switch box 2 is connected to the test terminal T in the test mode so that the zinc oxide (ZnO) lightning arrester 1 is normally operated, (ZnO) arrester 1 is measured.

However, the above-mentioned "Leakage current measuring device for direct current surge arrester (Korean Patent Registration No. 10-0972004)" means that when a surge or an overvoltage occurs in the test mode, the measuring device is exposed to surge or overvoltage, It is inevitably damaged or broken, and thus it is difficult to use it realistically.

Moreover, since the memory switch box 2 for performing the mode conversion has the same structure as the relay device, the connection portion between the switch terminal S and the normal terminal N, which are simply connected to each other, This weak coupling can easily break the connection part when it is exposed to surge or overvoltage, and it can not discharge the surge or overvoltage when the connection part is broken. Therefore, the power device such as transmission line, generator, There is a problem that it is exposed to surge or overvoltage and it is difficult to use it more realistically.

The above-mentioned "Leakage current measuring device for direct current surge arrester (Korean Patent Registration No. 10-0972004)" converts the leakage current into a test mode to detect leakage current of the lightning arrester, There is an additional problem that it is inconvenient to use.

Korea Patent Registration No: 10-035664 (Leakage Current Measurement Device of Portable Arrester and Measurement Method of Leakage Current of Arrester) Korean Patent Registration No: 10-0498927 (Method and Apparatus for Measuring Resistive Leakage Current Using Time Delay Synthesis Method in Deterioration Diagnosis of Lightning Arrester) Korea Patent Registration No: 10-0972004 (Leakage Current Measurement Apparatus for DC Arrester)

SUMMARY OF THE INVENTION The present invention has been made in order to solve all of the above problems, and an object of the present invention is to provide a leakage current measuring apparatus and a method of operating the same in a normal operation state of a DC arrester without conversion of a measurement mode It is not only easy to use the apparatus because it can continuously detect the leakage current flowing and has a structure capable of discharging the discharge current to the ground by the flashing of the gap (gap) of the ground portion when a surge or an overvoltage occurs The present invention provides a leakage current detector for deterioration diagnosis of a DC arrester capable of stably preventing damage or breakage of a measuring device even when a surge or an overvoltage occurs.

Furthermore, even if a part of the overvoltage is introduced into the measuring line, it is possible to clamp by a surge voltage through the overvoltage protection circuit, thereby enhancing the structural safety and securing the versatility of the apparatus. And a detection device.

According to an aspect of the present invention, there is provided a leakage current detecting apparatus for detecting a deterioration of a DC surge arrester, the apparatus comprising: an upper ground terminal and a ground terminal for generating a gap in the DC line, A measurement line formed on the measurement line, the measurement line being connected to the upper ground terminal of the ground unit, and the other end of the measurement line being connected to the lower ground terminal; a microprocessor (MPU) connected to the measurement line for measuring a leakage current (I) of the DC surge arrester by measuring a potential difference (V _{1 -2} ) between _one end and the other end of the measurement line; A power supply unit for supplying power to the processor, and a case including the ground unit, the measurement line, the measurement impedance, the microprocessor, and the power supply unit. The.

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The solar cell module further includes a charging unit configured to include a solar cell plate that absorbs sunlight and converts the solar light into electric energy, and a battery that is electrically connected to the solar cell plate and stores electricity generated from the solar cell plate, And the battery of the battery is electrically connected to the power unit.

The apparatus further includes an overvoltage protection circuit that is electrically connected to the measurement line, and that protects the device by clamping the measurement line to a safe voltage when an overvoltage is generated.

As described above, according to the leakage current detecting apparatus for the deterioration diagnosis of the DC arcing device according to the present invention, the DC leakage current can be detected in the normal operation state of the DC arrester without changing the measurement mode (normal mode, It is possible to continuously detect the leakage current flowing through the lightning arrester, thereby making it convenient to use the device, and also, when a surge or an overvoltage occurs, a gap (gap) It is possible to stably prevent damage or breakage of the measuring apparatus even if surge or overvoltage occurs.

Further, even if a part of the overvoltage is introduced into the measuring line, it can be clamped to a safe voltage through the overvoltage protection circuit, thereby enhancing the structural safety and securing the versatility of the apparatus.

1 is a conceptual diagram of an apparatus for measuring leakage current of a conventional direct current surge arrester
2 is a conceptual diagram of a leakage current detecting apparatus for deterioration diagnosis of a DC arcing device according to an embodiment of the present invention.
Fig. 3 is a perspective view of the leakage current detecting apparatus for deterioration diagnosis of the DC arrester shown in Fig. 2
Fig. 4 is an exploded perspective view of the leakage current detecting apparatus for deterioration diagnosis of the DC arcing device shown in Fig.
Fig. 5 is a diagram showing the state of use of the leakage current detecting apparatus for deterioration diagnosis of the DC arcing device shown in Fig. 2

A leakage current detecting apparatus for deterioration diagnosis of a DC arcing device according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Detailed descriptions of well-known functions and constructions that may be unnecessarily obscured by the gist of the present invention will be omitted.

FIG. 2 is a block diagram of a leakage current detecting apparatus for deterioration diagnosis of a direct current surplus arrester according to an embodiment of the present invention. Fig. 3 is a perspective view of the leakage current detecting apparatus for diagnosing deterioration of the DC arrester shown in Fig. 2, Fig. 4 is an exploded perspective view of the leakage current detecting apparatus for diagnosing deterioration of the DC arrester shown in Fig. 2 And FIG. 5 is a diagram showing the state of use of the leakage current detecting apparatus for deterioration diagnosis of the DC arcing device shown in FIG.

A leakage current detection apparatus 100 for diagnosing deterioration of a DC arrester according to an embodiment of the present invention includes a grounding unit 10, a measurement line 20, a measurement impedance 30, A microprocessor 40, a power supply unit 50, and a case 60.

2 and 4, the grounding unit 10 is formed on the DC line to which the DC surge arrester 1 is connected. The grounding unit 10 includes a top ground terminal 11 And the lower ground terminal 12 are spaced apart from each other finely.

That is, as shown in FIG. 5A, the leakage current I flowing in the DC arrester 1 due to the gap 13 formed in the grounding portion 10 is induced to flow into the measurement line 20, 5B, when the grounding unit 10 is exposed to an overvoltage, the dielectric strength of the air located in the gap 13 is broken and flashing. As a result, So that the overcurrent is discharged to the earth through the ground terminals 11 and 12 of the grounding unit 10. [

2 and 4, the measuring line 20 has one end connected to the upper ground terminal 11 of the ground unit 10 and the other end connected to the lower ground terminal 12, So that a leakage current (I) flowing to the DC arrester (1) flows.

As shown in FIG. 2, when the overvoltage is generated in the measurement line 20 by being electrically connected to the measurement line 20, the overvoltage protection circuit, which clamps the voltage to a safe voltage to protect the device from overvoltage, It is preferable to enhance the structural safety of the leakage current detecting apparatus 100 for diagnosing deterioration of the DC arcing device of the present invention.

As the overvoltage protection circuit 110, a tranzorb or the like may be selectively used.

2, the measurement impedance 30 is formed on the measurement line 20, and is formed at the center of the measurement line, so that the potential difference (V _{1 -} V ₂₎ between one end and the other end of the measurement line, ₂ so that the leakage current I flowing from the microprocessor 40 to the DC surge arrester 1 can be easily detected.

2, the microprocessor (MPU) 40 is connected to the measurement line 20 to measure a potential difference (V _{1 -2} ) between _one end and the other end of the measurement line 20, 1 through the value of the resistance R and the potential difference V _{1 -2} of the measurement impedance by detecting the leakage current I of the leakage current I in the _{first embodiment} .

2 and 4, the detection value of the leakage current I detected by the microprocessor 40 is transmitted to a remote site (PC) via a wireless transmission unit 70 capable of transmitting data to the outside, A smart phone, etc.), so that the detection value can be easily checked from the outside.

At this time, the wireless transmission unit 70 receives power through the power supply unit 50 to be operated through the control of the microprocessor 40.

2 to 4, a liquid crystal 80 for outputting and providing a detection value detected by the microprocessor 40 is provided on one side of the case 60 to be laid out, It is possible to recognize the detection value of the leakage current I so as to provide usability of the apparatus.

As shown in FIGS. 2 and 4, the power supply unit 50 supplies power to the microprocessor 40 and may be embodied as a conventional battery, but is not limited thereto.

As shown in FIGS. 2 to 4, a solar cell 91 that absorbs sunlight and converts the sunlight into electric energy, and a solar cell 91 that is electrically connected to the solar cell 91, And a charging unit 90 composed of a battery 92 for storing electricity to be produced,

It is preferable that the electricity generated through the solar panel 91 is supplied to the power source unit 50 so that the power source unit 50 can be continuously used without replacement to provide convenience to the user.

It is a matter of course that the battery 92 of the charging unit 90 is electrically connected to the power source unit 50.

3, the case 60 internally protects the ground 10, the measurement line 20, the measurement impedance 30, the microprocessor 40, and the power supply 50 .

The leakage current detecting apparatus 100 for deterioration diagnosis of the DC arrester of the present invention having the above-described components according to the present invention can be applied to the DC arrester 1 without conversion of the measurement mode (normal mode, test mode) The leakage current I flowing through the DC arrester 1 can be continuously detected in a normal operating state of the DC arrester 1 so that it is convenient to use the apparatus and when a surge or an overvoltage occurs, The leakage current detection device 100 for detecting the deterioration of the direct current surge arrester of the present invention can prevent damage or breakage of the leakage current detection device 100 even if a surge or an overvoltage occurs due to a structure in which the discharge current can be discharged to the ground. There is an effect that it can be prevented stably.

Further, even if a part of the overvoltage is introduced into the measurement line 20, the voltage can be clamped to a safe voltage through the overvoltage protection circuit 110, thereby further enhancing the structural safety and securing the versatility of the device. .

The leakage current detecting apparatus 100 for deterioration diagnosis of the DC arcing device according to the present invention having the above-described configuration detects the leakage current I of the DC arcing device 100 as follows.

5A, when the leakage current I flows through the DC surge arrester 1 due to the structure in which the gap 13 is formed inside the grounding portion 10, the leakage current I flows into the measurement line 20 A potential difference V _{1 -2} between both ends of the measurement line 20 is generated due to the measurement impedance 30 formed on the measurement line 20 at this time so that in the microprocessor 40, The leakage current (I) value is easily detected through the potential difference (V _{1 -2} ) at both ends and the resistance (R) value of the measured impedance.

The detection value of the leakage current I can be transmitted to the remote site via the wireless transmission unit 70 or can be easily output to the administrator through the liquid crystal 80 installed in the case 60. [

5b, if a surge or an overvoltage occurs on the DC line and is guided to the ground 10 through the DC arrester 1, the gap 13 of the ground 10 due to the overvoltage, The overcurrent flows through the ground terminals 11 and 12 of the grounding unit 10 and is discharged to the earth to safely protect various power equipment connected to the DC line. .

Therefore, when a surge or an overvoltage occurs, surge or overvoltage can be safely discharged to the outside owing to the structure in which the gap 13 of the grounding portion 10 is flared. Therefore, surge or overvoltage can be used to diagnose the deterioration of the DC surge arrester of the present invention It is possible to stably protect the apparatus by interrupting the inflow of the leakage current into the leakage current detecting apparatus 100. [

5B, even if a part of the overvoltage is introduced into the measurement line 20, the DC voltage can be clamped to a safe voltage through the overvoltage protection circuit 110, thereby further improving the deterioration diagnosis of the DC surge arrester of the present invention. It is possible to stably protect the leakage current detecting device 100 for the present invention.

 While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. You will understand the point. It goes without saying that variations can be made by those skilled in the art without departing from the spirit of the present invention. Accordingly, the scope of claim of the present invention is not limited within the scope of the detailed description, but will be defined by the following claims and technical ideas thereof.

1. Lightning Arrester 2. Memory Switch Box
3. Shunt resistor 4. Control measuring part
5. Computer S. Switch terminal
N.Normal terminal T.Test terminal
10. Grounding section 11. Top grounding terminal
12. Lower ground terminal 13. Gap
20. Measuring line 30. Measuring impedance
40. Microprocessor 50. Power supply
60. Case 70. Radio transmitter
80. Liquid crystal 90. Charging unit
91. Solar panel 92. Battery
110. Overvoltage Protection Circuit
100. Leakage Current Detection Device for Deterioration Diagnosis of DC Arrester

Claims (5)

The grounding part 10 (10) is formed on the direct current line to which the DC surge arrester (1) is connected, and the upper ground terminal (11) and the lower ground terminal (12) );
A measurement line 20 having one end connected to the upper ground terminal 11 of the ground unit 10 and the other end connected to the lower ground terminal 12;
A measurement impedance 30 (impedance) formed on the measurement line 20;
A microprocessor 40 connected to the measurement line 20 for detecting a leakage current I of the DC surge arrester 1 by measuring a potential difference V _{1 -2} between one end and the other end of the measurement line 20, );
A power supply unit 50 for supplying power to the microprocessor 40; And
And a case 60 incorporating the grounding unit 10, the measurement line 20, the measurement impedance 30, the microprocessor 40, and the power supply unit 50. The DC- Leakage current detection device for diagnosis.
delete delete The method according to claim 1,
A solar panel 91 that absorbs sunlight and converts the sunlight into electric energy,
And a charging unit (90) electrically connected to the solar panel (91) and configured by a battery (92) for storing electricity produced by the solar panel (91)
Wherein the battery (92) of the charging unit (90) is electrically connected to the power supply unit (50).
The method according to claim 1,
And an overvoltage protection circuit (110) electrically connected to the measurement line (20) and clamping the measurement line (20) when the overvoltage is generated to a safe voltage to protect the device from the overvoltage Wherein the leakage current detection device comprises:

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