KR20180050158A - Apparatus for supervising status of lightening arrester - Google Patents

Abstract

The present invention relates to an apparatus and a method for supervising a status of a lighting arrester. According to an embodiment of the present invention, the apparatus for supervising a status of a lighting arrester comprises: an operation current supervising unit for detecting operation current of a lighting arrester to count the cumulative number of operations of the lighting arrester; and a leakage current supervising unit for checking an abnormal status of the lighting arrester by detecting leakage current of the lighting arrester according to a replacement time checking result of the lighting arrester.

Description

[0001] APPARATUS FOR SUPERVISING STATUS OF LIGHTENING ARRESTER [0002]

The present invention relates to an arrester monitoring apparatus and method, and more particularly, it is possible to remotely monitor an arrester's operation state by detecting an operation current and a leakage current of the arrester, The present invention relates to an arrester state monitoring apparatus and method.

Transmission towers are susceptible to lighting strike because they are high in height due to high voltage transmission voltage, expansion of transmission and distribution lines, and increase in sick times as electric power demand increases. Also, in the transmission and distribution line, the occurrence frequency of the abnormal voltage due to the switching surge such as the installation of the vacuum circuit breaker and the phase-advance condenser is high. For this reason, 'lightning arrester' must be installed in transmission towers or transmission and distribution lines.

The lightning arrester does not conduct current at the normal voltage but protects the insulation of the electric installation when the peak value of the overvoltage caused by the opening or closing of the brain or circuit exceeds a certain reference value while blocking the flux at the same time for a short time, And when the high-voltage intrusion is completed, it returns to the original state without flowing the current again. That is, the lightning arrester is a kind of protection device having a function of discharging a part or all of energy in order to reduce the peak value of an abnormal voltage generated or induced in the power system, and restoring the insulation of the line by blocking the conductive path after discharge .

In general, it is easy to understand the arrester if it is understood that arrester and fuse are in relative relation. In other words, the fuse is opened when the overcurrent flows through the circuit (self-melting and breaking) to protect the protected device, while the surge arrester is short-circuited when the overvoltage occurs (self-earth and circuit configuration) to protect the protected device.

Such a lightning arrester is installed for the purpose of alleviating the peak value of the surge voltage or the wave level to the electric line. In other words, surge arresters are the most widely used devices for protecting electric devices from overvoltage, and are installed in foot / substations with almost no exceptions.

A general lightning arrester consists of a lightning arrester and a capacitance coupling device. The arrester requires the following performance. First, it should be discharged immediately in the case of abnormal voltage invasion, and should have characteristics of operation responsibility to completely shut off the flow. Second, it should be able to withstand long-term use of repeated current interruption and interruption of large current, and maintain the characteristic of automatic recovery.

On the other hand, the arrester must comprehensively examine and apply the overvoltage of the system, the shielding of the facilities, the weather conditions, and the characteristics of the line in order to realize the desired function. That is, it is important to check the deterioration state of the power system so as to exhibit the desired function, because the surge arrester functions to suppress an abnormal voltage that overvoltage occasionally occurs due to natural phenomenon and driving operation of the apparatus in the power system. The factors that may degrade the performance of the arrester are as follows. First, if the surface of the lightning arrester is damaged by salt or the like, the potential distribution of the series gap changes, and the discharge start voltage fluctuates. In addition to these external conditions, there is also the deterioration of the lightning arrester itself. Second, deterioration can be promoted by moisture penetration into the lightning arrestor vessel, leakage current due to constant applied voltage, and excessive discharge current due to arrester operation in the environment of use. Third, deterioration can be promoted by repeated operation due to abnormal voltage generation.

The deteriorated surge arrester is overheated at the normal operating voltage due to the increase of the leakage current. When reaching the thermal runaway, the surge arrester may cause a ground fault and cause secondary human and material accidents.

The method of diagnosing the deterioration condition of the lightning arrester is carried out through the insulation deterioration measurement by the insulation deterioration analyzer, the insulation resistance measurement by mega, and the leakage current measurement test (LCD-4 leakage current meter).

First, the measurement by the insulation deterioration analyzer is possible after stopping the operation of the device. The method of measuring the insulation resistance by mega is the most general method, and it can be measured relatively easily in an emergency. However, the insulation resistance value It is difficult to judge the trend of the equipment aging because it differs greatly depending on the manufacturer and the arrester type. In addition, the measurement method using the LCD-4 leakage current meter can easily measure the resistance current and the power loss by using the capacity minute automatic compensation circuit in the live state, but it is influenced by the skill of the equipment user and the external environment at the time of measurement .

In this way, it is important to diagnose the state of the lightning arrester in order to improve the reliability of the power supply. Conventionally, Korean Patent Laid-Open Publication No. 2014-0083431 discloses an arrester condition diagnosis technique. Such a method uses a digital arrester counter, which is expensive, vulnerable to noise, and an indicator lamp. In addition, the digital arrester counter must be equipped with a separate power supply unit (AC 85V ~ 260V). In the case of installing a digital arrester counter on a conventional foot / furnace, it is unreasonable in terms of economical efficiency because the construction cost is excessive.

Therefore, it is necessary to propose a technique of remotely monitoring the deterioration state of the lightning arrester operating in a foot / substation without a separate power source.

An object of the present invention is to provide an arrester condition monitoring apparatus and method capable of efficiently repairing and operating facilities by confirming the state of a lightning arrester by detecting an operation current and a leakage current of a lightning arrester and remotely monitoring the state of the arrester have.

The arrester state monitoring apparatus according to an embodiment of the present invention includes an operation current monitoring unit for detecting an operation current of the arrester and counting the cumulative operation number of the arrester; And a leakage current monitoring unit for detecting a leakage current of the lightning arrester and confirming an abnormal state of the lightning arrester in accordance with a result of checking the replacement time of the lightning arrester.

Wherein the operation current monitoring unit includes: a cumulative counting unit that counts the number of operations of the arrester by detecting an operation current of the arrester, compares the cumulative operation count of the arrester with a predetermined number of replacement operations; A reset unit for initializing a cumulative operation count of the cumulative counting unit; And an operation frequency output unit for externally transmitting the operation frequency of the arrester.

The leakage current monitoring unit may include: a leakage current detector that detects a leakage current of the lightning arrester; A reference current setting unit for setting a reference current according to a degree of progress of insulation deterioration of the lightning arrester; A comparing unit comparing the detected leakage current with the reference current; And an alarm output unit for outputting an alarm generated according to the comparison result to the outside.

The leakage current monitoring unit includes an AC / DC converting unit that converts the AC leakage current detected by the leakage current detecting unit into a DC leakage current and outputs the DC leakage current.

The AC / DC converter converts the detected AC leakage current of 0 to 5 mA into a DC leakage current of 4 to 20 mA.

According to an aspect of the present invention, there is provided an arrester state monitoring apparatus comprising: a leakage current detector for detecting a leakage current of a lightning arrester; A reference current setting unit for setting a reference current according to a degree of progress of insulation deterioration of the lightning arrester; And a comparing unit comparing the detected leakage current with the reference current to check an abnormal state of the lightning arrester.

And an AC / DC converter for converting the AC leakage current detected by the leakage current detector into a DC leakage current and outputting the DC leakage current.

The AC / DC converter converts the detected AC leakage current of 0 to 5 mA into a DC leakage current of 4 to 20 mA.

According to an aspect of the present invention, there is provided a surge arrester status monitoring method comprising the steps of: detecting an operation current of a surge arrester and confirming a cumulative operation time of the arrester; Comparing the cumulative number of times of operation of the lightning arrester with the predetermined number of times of replacement operation; Detecting a leakage current of the lightning arrestor according to the comparison result, and comparing the leakage current with a preset reference current; And generating an abnormal state alarm of the lightning arrester in accordance with the comparison result.

The reference current is set in stages according to the progress of insulation deterioration of the lightning arrester.

The step of comparing the number of operations includes a step of notifying the replacement time of the arrester when the number of cumulative operations of the arrester exceeds the number of replacement operations.

The present invention can remotely monitor the state of the lightning arrester by detecting the operation current and the leakage current of the lightning arrester, and can confirm the state of the lightning arrester in advance and efficiently repair and operate the installation.

Also, according to the present invention, the degree of progress of the insulation deterioration of the lightning arrester can be grasped in advance by setting the increase or decrease of the leakage current to three levels according to the preset alarm level.

Further, according to the present invention, the operating current of the lightning arrester is detected and the number of times of operation is checked, so that the lightning arrester replacement point of time can be checked and the replacement or maintenance of the lightning arrester can be judged.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a diagram showing a power transmission tower equipped with an arrester state monitoring apparatus according to an embodiment of the present invention;
1B shows a network for remote monitoring of the lightning arrester of FIG. 1A;
2 is a circuit diagram of a lightning arrestor state monitoring apparatus according to an embodiment of the present invention.
3 is a diagram illustrating a method of monitoring a lightning arrestor according to an embodiment of the present invention.

For a better understanding of the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention. Therefore, the shapes and the like of the elements in the drawings can be exaggeratedly expressed to emphasize a clearer description. It should be noted that in the drawings, the same members are denoted by the same reference numerals. Detailed descriptions of well-known functions and constructions which may be unnecessarily obscured by the gist of the present invention are omitted.

FIG. 1A is a view showing a power transmission tower equipped with a lightning arrester status monitoring apparatus according to an embodiment of the present invention, and FIG. 1B is a diagram illustrating a network for remote monitoring of the lightning arrester of FIG. 1A.

Referring to FIG. 1A, a lightning arrestor state monitoring apparatus (hereinafter referred to as "arrester state monitoring apparatus") 100 according to an embodiment of the present invention is installed in a transmission tower 1 together with an arrester 10. The lightning arrester 10 is installed at the top of the transmission tower 1 and connected to the bus line of the transmission / distribution line. Insulating insulators 2 are provided between the transmission tower 1 and the lightning arresters 10 and are insulated from each other. The lightning arrestor state monitoring apparatus 100 is connected to the lightning arrester 10 through the lightning arrester down conductor 3 and to the ground through the grounding line 4. Here, the lightning arrester 10 discharges a part or all of the energy to reduce the abnormal voltage such as the lightning strike or the open / close surge to a predetermined value or less to prevent the electrical breakdown of the electric equipment, Quickly shut down the flowing stream and keep the system in normal condition.

Generally, the cause of an abnormal voltage in a power system is variously caused by an abnormal voltage in a power system such as a ground fault, sudden separation of a load, overspeed of a generator, resonance, and induced voltage from a nearby unbalanced parallel line. As a result, it is difficult for the lightning arrester 10 to determine the rated voltage in consideration of all the causes of the abnormal voltage generation in the power system. Therefore, the lightning arrester 10 is installed so as to be able to connect the conductor of the 154-kV and 345-kV voltage circuit, which is mainly used in the power system, to the ground and protect the electric device from a high transient voltage.

Referring to FIG. 1B, the remote server 140 may monitor the operation and state of the plurality of lightning arresters 10 to 10N. That is, the remote server 140 may be provided with monitoring information on the operation and status of the lightning arresters 10 to 10N from the plurality of lightning arrester status monitoring devices 100 to 100N. Accordingly, the person in charge can monitor the operation and status of the lightning arresters 10 to 10N scattered at the remote place through the remote server 140. [

The remote server 140 and the plurality of arrester condition monitoring devices 100 to 100N can be connected to each other through a wired / wireless network. For example, the wired and wireless network can be divided into several services, such as HTTP (Hyper Text Transfer Protocol), Telnet, File Transfer Protocol (FTP), Domain Name System (DNS) And a network information service (NIS), for example, the Internet Protocol (IP) protocol, the Transfer Protocol, the Simple Network Management Protocol (SNMP), the Network File Service (NFS)

2 is a circuit diagram of a lightning arrestor state monitoring apparatus according to an embodiment of the present invention.

As shown in FIG. 2, the surge arrester status monitoring apparatus 100 continuously monitors the deterioration state of the arrester 10 installed and operated in the foot / substation remotely without a separate power source, An alarm may be generated when the voltage exceeds the set range or when an abnormal voltage such as a brain / opening / closing surge is inputted.

The arrester state monitoring apparatus 100 has no separate power supply source and includes an operating current monitoring unit 110, a leakage current detecting unit 120, and an analog ammeter 130. The arrester condition monitoring apparatus 100 monitors the state of the arrester 10 by detecting operating current and leakage current drawn from the arrester 10 when an abnormal voltage flows into the arrester 10 .

The operation current monitoring unit 110 detects the operation current of the lightning arrester 10 and counts the number of operations of the lightning arrester 10 (that is, the number of abnormal voltages input to the lightning arrester). Here, the operating current monitoring unit 110 includes a cumulative counting unit 111 for detecting the operating current of the arrester 10 and counting and accumulating the number of operations of the arrester 10, a cumulative counting unit 111 for counting the cumulative count of the cumulative counting unit 111 And an operation frequency output unit 113 for outputting the operation frequency of the lightning arrester 10 to the outside in cooperation with the external remote server 140. [ The cumulative counting unit 111 may use a silicon controlled rectifier (SCR) or the like. The reset unit 112 initializes the cumulative operation count of the cumulative counting unit 111 when the arrester 10 is replaced.

The remote server 140 can confirm the replacing time of the lightning arrester 10 and guide the person in charge. That is, the remote server 140 compares the cumulative operation count of the lightning arrester 10 with the previously determined number of replacement operations. If the cumulative operation count exceeds the replacement operation count, the remote server 140 informs the supervisor of replacement time of the lightning arrester 10 can do. Accordingly, the person in charge can efficiently repair and operate the lightning arrester 10 by recognizing in advance the progress of the degree of deterioration of the lightning arrester 10, which was confirmed at the time of regular inspections (once / year) with the naked eye of the lightning arrester 10 have.

The remote server 140 directly compares the cumulative operation count of the arrester 10 delivered from the operation current monitoring unit 110 of the arrester condition monitoring apparatus 100 with the number of replacement operations, The replacement time of the lightning arrester 10 can be informed to the person in charge by using the 'comparison result of the cumulative operation number and the replacement operation number' transmitted by the operation current monitoring unit 110 It is possible. That is, the operation current monitoring unit 110 may compare the cumulative operation count and the replacement operation count, and may transmit the result to the remote server 140.

The leakage current monitoring unit 120 detects the leakage current of the lightning arrester 10 and monitors the insulation deterioration state of the lightning arrester 10. The leakage current monitoring unit 120 includes a leakage current detecting unit 121, a reference setting unit 122, a comparing unit 123, an alarm output unit 124, and an AC / DC converting unit 125.

The leakage current detection unit 121 detects a leakage current of the lightning arrester 10.

The reference current setting section 122 sets a reference current for comparison with the leakage current of the lightning arrester 10. That is, the reference current setting unit 122 may set the reference current for outputting the alarm about the leakage current of the lightning arrester 10 step by step. For example, the reference current may be optionally applied in three stages (ie, the precautionary I → the precautionary II → the danger III), depending on the alarm level for the alarm output (ie, the degree of progress of the insulation deterioration of the arrester). That is, the reference current can be set step by step because the leakage current may vary according to external conditions such as a gas phase state and the like.

As described above, the degree of progress of the insulation deterioration of the lightning arrester 10 can be constituted by a non-power source apparatus without a separate power source device, which is displayed quantitatively according to the set reference current level.

The comparator 123 compares the leakage current detected by the leakage current detector 121 with a preset reference current. That is, when the leakage current detected by the leakage current detection unit 121 exceeds a preset reference current, the comparison unit 123 generates an alarm notifying the abnormal condition of the lightning arrester 10. Here, the alarm output unit 124 outputs the alarm generated according to the comparison result of the comparison unit 123 to the external remote server 140. That is, the alarm output unit 124 can output the comparison result of the comparison unit 123 as a contact signal. In this manner, the person in charge can grasp the progress of the insulation deterioration progress of the lightning arrester 10 in advance, and can determine whether the lightning arrester 10 is replaced or repaired.

The remote server 140 may use the alarm outputted from the alarm output unit 124 to inform the person in charge of the abnormality of the lightning arrester 10 that the leakage current detected by the leakage current detection unit 121 Value of the lightning arrester 10 and the preset reference current, and inform the person in charge of the abnormal situation of the lightning arrester 10 according to the result.

The AC / DC conversion unit 125 converts the AC leakage current detected by the leakage current detection unit 121 into a DC leakage current. For example, the AC / DC converter 125 converts the leakage current AC 0 mA to DC 4 mA and the leakage current AC 5 mA to DC 20 mA. That is, the AC / DC converter 125 converts the leakage current AC 0 to 5 mA signal to a DC 4 to 20 mA signal. Therefore, the AC / DC converting unit 125 outputs a DC 4-20 mA signal.

The AC / DC converter 125 connects the system to the total system for prevention of online transmission. Through this, total harmonic leakage currents can be measured from the total leakage currents in the total substation prevention system 1, 3, 5, 7, and 9.

On the other hand, the analog ammeter 130 measures the leakage current of the lightning arrester 10 which normally flows to the ground. The analog ammeter 130 has a structure capable of opening the enclosure when the ammeter and the internal circuit are broken down.

3 is a diagram illustrating a method of monitoring a lightning arrestor according to an embodiment of the present invention.

The arrester status monitor 100 detects the operation current of the arrester 10 at step S201 and accumulates the number of operations of the arrester 10 to check the cumulative operation number at step S202. (S203). Here, when the number of cumulative operations exceeds the number of replacement operations (S203), the arrester status monitor 100 notifies the remote server 140 of the arrester status. At this time, the remote server 140 may give an alarm to the person in charge about the replacing time of the lightning arrester 10 (S204).

When the number of cumulative operations does not exceed the number of replacement operations (S203), the arrester surveillance apparatus 100 detects the leakage current of the arrester 10 (S205). At this time, when the detected leakage current exceeds the predetermined reference current (S206), the arrester status monitoring apparatus 100 transmits an alarm to the remote server 140 indicating the abnormal state of the arrester 10.

In addition, if the detected leakage current does not exceed the preset reference current (S206), the arrester surveillance state monitoring apparatus 100 performs step S201 and thereafter again.

In the meantime, the above-described arrester condition monitoring method is described only for the arrester condition monitoring apparatus 100 for convenience of explanation, but can also be performed in the remote server 140. That is, the remote server 140 compares the cumulative operation count with the replacement operation count using the operation current detected by the arrester state monitoring apparatus 100, and provides an alarm to the person in charge about the replacement time of the lightning arrester 10 (Refer to S201 to S204), it is possible to compare the leakage current detected by the leakage current detected by the arrester surveillance state monitoring apparatus 100 with the reference current, and to provide an alarm for the abnormal state of the lightning arrester 10 to the person in charge (See S205 to S207).

It will be apparent to those skilled in the art that various modifications and variations may be made in the present invention. Accordingly, it is to be understood that the present invention is not limited to the above-described embodiments. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

110: operating current monitoring unit 111: cumulative counting unit
112: reset unit 113: operation frequency output unit
120: Leakage current monitoring unit 121: Leakage current detector
122: Reference current setting unit 123:
124: Alarm output unit 125: AC / DC conversion unit
130; Analog Ammeter 140: Remote Server

Claims (11)

An operation current monitoring unit for detecting the operation current of the arrester and counting the cumulative operation number of the arrester; And
A leakage current monitoring unit for detecting a leakage current of the lightning arrester and confirming an abnormal state of the lightning arrester in accordance with a result of checking the replacement time of the lightning arrester;
And an arrester state monitoring unit.
The method according to claim 1,
Wherein the operation-
A cumulative counting unit for counting the number of operations of the arrester by detecting an operation current of the arrester and comparing the cumulative operation count of the arrester and the predetermined number of replacement operations;
A reset unit for initializing a cumulative operation count of the cumulative counting unit; And
An operation frequency output unit for transmitting the operation frequency of the arrester to the outside;
And an arrester state monitoring unit.
The method according to claim 1,
The leakage current monitoring unit may include:
A leakage current detector for detecting a leakage current of the lightning arrester;
A reference current setting unit for setting a reference current according to a degree of progress of insulation deterioration of the lightning arrester;
A comparing unit comparing the detected leakage current with the reference current; And
An alarm output unit for outputting an alarm generated according to the comparison result to the outside;
And an arrester state monitoring unit.
The method of claim 3,
The leakage current monitoring unit may include:
And an AC / DC converter for converting the AC leakage current detected by the leakage current detector into a DC leakage current and outputting the DC leakage current.
5. The method of claim 4,
Wherein the AC / DC converter includes:
And converts the detected AC leakage current of 0 to 5 mA into a DC leakage current of 4 to 20 mA.
A leakage current detector for detecting a leakage current of the lightning arrester;
A reference current setting unit for setting a reference current according to a degree of progress of insulation deterioration of the lightning arrester; And
A comparing unit comparing the detected leakage current with the reference current to check an abnormal state of the lightning arrester;
And an arrester state monitoring unit.
The method according to claim 6,
And an AC / DC converter for converting the AC leakage current detected by the leakage current detector into a DC leakage current and outputting the DC leakage current.
8. The method of claim 7,
Wherein the AC / DC converter includes:
And converts the detected AC leakage current of 0 to 5 mA into a DC leakage current of 4 to 20 mA.
Detecting an operation current of the lightning arrester and confirming the cumulative operation number of the lightning arrester;
Comparing the cumulative number of times of operation of the lightning arrester with the predetermined number of times of replacement operation;
Detecting a leakage current of the lightning arrestor according to the comparison result, and comparing the leakage current with a preset reference current;
Generating an abnormal state alarm of the lightning arrester in accordance with the comparison result;
And an arrester condition monitoring unit for monitoring the arrester condition.
10. The method of claim 9,
The reference current,
Wherein the lightning arrestor is set in a step-by-step manner according to the progress of insulation deterioration of the lightning arrester.
10. The method of claim 9,
Wherein the operation number comparing step includes:
And when the number of times of cumulative operation of the arrester exceeds the number of replacement operations, notifying the replacing time of the arrester.

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