KR101990930B1 - Arrester equipped with apparatus for monitoring a status - Google Patents

Abstract

The present invention relates to an arrester, which is an arrester equipped with a state monitoring apparatus. The arrester can perform a predictive diagnosis through continuous monitoring of aging changes of the arrester, and can provide sufficient information in terms of power equipment asset management. According to one embodiment of the present invention, the arrester equipped with a state monitoring apparatus comprises: an arrester device for each phase; and a state monitoring apparatus detecting a leakage current of each phase arrester device and performing a simple diagnosis and a predictive diagnosis using the detected leakage current.

Description

[0001] ARRESTER EQUIPPED WITH APPARATUS FOR MONITORING A STATUS [0002]

The present invention relates to a lightning arrester, and more particularly, to a lightning arrester incorporating a state monitoring apparatus.

The lightning arresters, which mainly use nonlinear devices, are one of the important power devices to protect transmission lines and generators / substations by absorbing electrical energy such as brain surge, open surge, transient overvoltage,

In particular, zinc oxide (ZnO) lightning arresters have excellent surge protection characteristics and are now rapidly applied to power systems, resulting in the elimination of series gaps due to their excellent nonlinear resistance characteristics.

Therefore, the lightning arrestor structure becomes more compact, has a convenience of manufacturing, and has a very fast response time to transient voltage, so that there is no transient phenomenon and little flow of current flows. On the other hand, there is a disadvantage that micro leakage current flows due to not only the stress caused by the brain surge and the switching surge but also the power source.

In general deterioration diagnosis technology of the lightning arrester, there is a method of measuring the operating temperature of the lightning arrester, the 3-harmonic frequency spectrum of the total leakage current, the phase difference between the power supply voltage and the total leakage current. Among them, the method of diagnosing the deterioration of the lightning arrester by measuring the total leakage current generated from the lightning arrester in operation is widely used because it is easy to measure.

Korean Patent Laid-Open Publication No. 2018-0050158 discloses an operation monitoring unit for detecting the operation current of the lightning arrester and counting the cumulative operation number of the lightning arresters. 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.

Korean Patent Laid-Open Publication No. 2014-0083431 discloses a method of controlling the leakage current of a lightning arrester by receiving a leakage current of the lightning arrestor, converting the leakage current into a voltage, comparing the converted voltage with a reference voltage, And generating an alarm signal using the converted voltage as a driving power source if the converted voltage is equal to or greater than the reference voltage.

As described above, in the prior art, the technology for monitoring the lightning arrester state through the leakage current monitoring and the surge counting is mainly performed, and the event diagnosis is performed instead of the continuous monitoring of the lightning change. Therefore, There is a problem. In addition, the prior art can not perform predictive diagnosis and thus can not prevent a power accident in advance.

Korean Laid-Open Patent No. 2018-0050158 (published on May 21, 2014) Korean Patent Laid-Open Publication No. 2014-0083431 (published on April 04, 2014)

It is an object of the present invention to provide a lightning arrester equipped with a state monitoring device capable of performing predictive diagnosis through continuous monitoring of the lightning surge of lightning arresters and providing sufficient information from the viewpoint of electric power facility asset management .

According to another aspect of the present invention, there is provided a surge arrester including a state monitoring device, And a state monitoring device for detecting leakage currents of the respective lightning arrestors and performing a simple diagnosis and a prediction diagnosis using the detected leakage currents.

Here, the status monitor may include a liver diagnostic unit for performing the liver diagnosis every predetermined first period; And a predictive diagnosis unit that performs the preliminary diagnosis at every second predetermined period, and the second period may be longer than the first period.

And, the prediction diagnosis can be performed using an approximate curve function calculated for the leakage current for a predetermined reference time.

The present invention can perform the diagnostic diagnosis through the state monitoring apparatus built in the lightning arrester. This makes it possible to make predictive diagnosis through long-term changes.

Further, the present invention can provide sufficient information on the lightning arrester from the viewpoint of power facility asset management through the lightning arrester life prediction.

FIG. 1 is a view showing an installation state of a lightning arrester according to a preferred embodiment of the present invention.
2 is a functional block diagram of the state monitoring apparatus of FIG.
Fig. 3 shows leak currents of the respective lightning arrestors in the lightning arresters of Fig. 1; Fig.
Fig. 4 shows a flow chart for the simplified diagnosis process of the simple diagnosis part of Fig. 2;
Fig. 5 shows a flowchart for the predictive diagnosis process of the predictive diagnosis unit of Fig. 2;

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for like elements in describing each drawing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention.

The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, a lightning arrester incorporating a state monitoring apparatus according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a view showing an installation state of a lightning arrester according to a preferred embodiment of the present invention. 2 is a functional block diagram of the state monitoring apparatus of FIG. Fig. 3 shows leak currents of the respective lightning arrestors in the lightning arresters of Fig. 1; Fig.

Referring to FIG. 1, the lightning arrester may be connected to the buses 11, 12, and 13 for supplying electric power. Here, reference numeral 11 denotes an R phase, reference numeral 12 denotes an S phase, and reference numeral 13 denotes a T phase. The lightning arrester (1) may include the lightning protection elements (21, 22, 23). Zinc oxide may be used as the lightning protection element. The present invention does not limit the composition or type of the lightning protection element. Reference numeral 21 denotes an R-phase light-emitting element, 22 denotes an S-phase light-emitting element, and 23 denotes a T-phase light-emitting element. The lightning protection elements 21, 22, and 23 may be connected to ground. Leakage current detectors (31, 32, 33) may be provided on the lead connecting the lightning protection elements (21, 22, 23) to the ground. A CT (Current Transformer) may be used as the leakage current detectors 31, 32, and 33.

The surge counter 50 may be installed on a wire connecting the lightning prevention elements 21, 22, and 23 to ground. The surge counter 50 may determine that a surge has flowed and count the surge when the current value on the wire connecting the surge devices 21, 22, 23 to the ground exceeds a predetermined value.

The state monitoring apparatus 40 can diagnose the lightning arrester 1 using the output values of the leakage current detectors 31, 32,

The state monitoring apparatus 40 includes a leakage current detecting unit 41, a liver diagnosis unit 42, a predictive diagnosis unit 43, a data management unit 44, a storage unit 45, an alarm unit 46, 47).

The leakage current detection unit 41 can detect the leakage current for each of the lightning arrestors 21, 22, and 23 every predetermined detection time. Here, the detection time may be, for example, one minute.

The simplified diagnosis unit 42 can diagnose the leakage current for each of the lightning arrestors 21, 22, and 23 every predetermined first period. Here, the first period may be, for example, one minute. At this time, the simplified diagnosis unit 42 can determine whether or not the leakage current for each of the lightning prevention elements 21, 22, and 23 exceeds the first threshold value TH1. At this time, if an event occurs in which the leakage current for each of the lightning arrestors 21, 22, and 23 exceeds the first threshold value TH1, an alarm may be provided to the outside via the alarm unit 46. [ At the time of an alarm, information on the leakage current value or leakage current value of each of the fastening elements 21, 22, 23 may exceed the first threshold value may be provided. Here, the first threshold value may be 0.5 mA.

The predictive diagnosis unit 43 can perform the preliminary diagnosis for the lightning arrester by using the leakage current for each of the lightning prevention elements 21, 22, and 23. The predictive diagnosis unit 43 can determine whether or not the leakage current for each of the lightning arrestors 21, 22, and 23 exceeds the second threshold value TH2 every second period. Here, the second period may be longer than the first period, for example, three days. The second threshold value TH2 may be smaller than the first threshold value TH1. For example, the second threshold value TH2 may be 0.35 mA. The predictive diagnosis unit 43 sets the second threshold value TH2 of the leakage currents for the lightning prevention elements 21, 22, and 23 to a predetermined reference time (for example, 6 months Quot;) < / RTI > for the leakage current of the current source. Curve fitting method, artificial intelligence, etc. can be used to extract approximate curve functions. An example of FIG. 3 will be described in more detail. Fig. 3 shows an example of leakage current of each phase. In Fig. 3, the R phase exceeds the second threshold value TH2 at the time tx. At this time, the predictive diagnosis unit 43 can calculate the approximate curve function using the leakage current value for the R phase during the reference time? T. Figure 3 shows an example approximated by a cubic curve function. The present invention does not limit the degree of the approximate curve function. Thus, when the approximate curve function for the reference time? T is generated, the predictive diagnosis unit 43 calculates the time? Tx required for the value of the approximate curve function to reach the first threshold TH1 . The time? Tx required for the value of the approximate curve function to reach the first threshold value TH1 may be the remaining service life. The predictive diagnosis unit 43 may provide information on the time (DELTA tx) required for the value of the approximate curve function to reach the first threshold TH1 through the alarm unit 46 to the outside. The predictive diagnosis unit 43 may provide an alarm to the outside when it is determined that the time? Tx required for the value of the approximate curve function to reach the first threshold TH1 is equal to or less than the preset reference remaining life.

The data management unit 44 may store the leakage current for each phase together with the measurement time information in the storage unit 45. [

The communication unit 47 provides communication between the lightning arrester 1 and an external device (not shown), and can provide state information of the arrester 1 to the upper node (leakage current, residual service life, alarm information, etc.).

Hereinafter, a method of diagnosing a lightning arrester in accordance with a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. The function of the above configuration can be made more clear by the following description. Fig. 4 shows a flow chart for the simplified diagnosis process of the simple diagnosis part of Fig. 2;

The simplified diagnosis unit 42 may be in the standby mode until the preset first period arrives (S41). In the standby mode, the leakage current detection unit 41 can detect the leakage current of each phase at a predetermined detection time, and outputs the leakage current of each phase through the data management unit 44 to the storage unit 45 Can be stored.

If it is determined that the first period has arrived, the simple diagnosis unit 42 can diagnose the leakage current for each of the lightning arrestors 21, 22, and 23 (S42 and S43). Here, the first period may be, for example, one minute. At this time, the simplified diagnosis unit 42 can determine whether or not the leakage current for each of the lightning prevention elements 21, 22, and 23 exceeds the first threshold value TH1 (S43). At this time, if an event occurs in which the leakage current for each of the lightning arrestors 21, 22, and 23 exceeds the first threshold value TH1, an alarm may be provided to the outside through the alarm unit 46 (S44). At the time of an alarm, information on the leakage current value or leakage current value of each of the fastening elements 21, 22, 23 may exceed the first threshold value may be provided. Here, the first threshold value may be 0.5 mA. If it is determined in S43 that an event exceeding the first threshold value TH1 has not occurred, the apparatus can enter the standby mode (S41).

Hereinafter, a method of diagnosing arcing surge arresters according to a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 5 attached hereto. The function of the above configuration can be made more clear by the following description. Fig. 5 shows a flowchart for the predictive diagnosis process of the predictive diagnosis unit of Fig. 2;

As described above, the leakage current detection unit 41 can detect the leakage current of each phase at the predetermined detection time, and the leakage current of each phase through the data management unit 44 is stored in the storage unit 45 together with the detection time information. (S51).

The predictive diagnosis unit 43 can determine whether or not the leakage current for each of the lightning prevention elements 21, 22 and 23 exceeds the second threshold TH2 if it is determined that the second period has arrived , S53). Here, the second period may be longer than the first period, for example, three days. The second threshold value TH2 may be smaller than the first threshold value TH1. For example, the second threshold value TH2 may be 0.35 mA.

If it is determined in S53 that the event exceeding the second threshold value TH2 has occurred, the predictive diagnosis unit 43 determines that the leakage current for each of the lightning prevention elements 21, 22, and 23 exceeds the second threshold value TH2 (S54) an approximation curves function for the leakage current for the predetermined reference time (DELTA t) with respect to the phase where the event occurs.

When the approximate curve function for the leakage current during the reference time? T is generated, the predictive diagnosis unit 43 calculates the time? Tx required for the value of the approximate curve function to reach the first threshold TH1 The lifespan of the lightning arrester 1 can be predicted (S54). The time? Tx required for the value of the approximate curve function to reach the first threshold value TH1 may be the remaining service life. The predictive diagnosis unit 43 may provide information on the time (DELTA tx) required for the value of the approximate curve function to reach the first threshold TH1 through the alarm unit 46 to the outside (S55 ). The predictive diagnosis unit 43 may provide an alarm to the outside when it is determined that the time? Tx required for the value of the approximate curve function to reach the first threshold TH1 is equal to or less than the preset reference remaining life.

Since the data throughput for performing the diagnostic diagnosis is very large, it is desirable that the diagnostic diagnostic period be longer than the simple diagnostic period. Through the above diagnosis, the lightning arrester manager can know the replacement period of the lightning arrester or the lightning arrester component by each phase, thereby facilitating asset management of the electric power facility.

11, 12, 13: Mothership
21, 22, 23:
31, 32, 33: Leakage current detector
40: Status monitor
41: Leakage current detection unit
42:
43: Predictive diagnosis unit
44: Data management unit
45:
46:
47:
50: Surge Counter

Claims (3)

Each phase-specific light-emitting element; And
And a state monitoring device for detecting leakage currents of the respective lightning arrestors and performing simple diagnosis and prediction diagnosis using the detected leakage current,
The state monitoring apparatus
A liver diagnosis unit for performing the liver diagnosis every predetermined first cycle; And
And a predictive diagnosis unit that performs the predictive diagnosis every second predetermined period,
Wherein the second period is longer than the first period,
Wherein the predictive diagnosis is performed using an approximate curve function calculated for a leakage current for a predetermined reference time,
The simple diagnosis part
When the leakage current of the light-emitting element exceeds the first threshold TH1, an alarm is externally provided through the alarm unit 46,
Wherein the predictive diagnosis unit determines whether or not the leakage current of the lightning protection element exceeds the second threshold value (TH2) at every second period,
Wherein when the leakage current of the light-emitting element exceeds the second threshold value (TH2), the predictive diagnosis unit calculates the leakage current value of the light-emitting element exceeding the second threshold value (TH2) The approximate curve function is calculated by using the leakage current value during the reference time (t) before the time point exceeding the threshold value (TH2)
The predictive diagnosis unit calculates a time? Tx required for the value of the approximate curve function to reach the first threshold value TH1,
If it is determined that the calculated time (DELTA tx) required for the value of the approximate curve function to reach the first threshold value TH1 is equal to or less than the predetermined reference remaining life, an alarm is externally provided
And the second threshold value (TH2) is smaller than the first threshold value. delete delete

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