KR101641515B1 - The distribution panel including a diagnosis apparatus using HFCT - Google Patents

The distribution panel including a diagnosis apparatus using HFCT Download PDF

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KR101641515B1
KR101641515B1 KR1020160041408A KR20160041408A KR101641515B1 KR 101641515 B1 KR101641515 B1 KR 101641515B1 KR 1020160041408 A KR1020160041408 A KR 1020160041408A KR 20160041408 A KR20160041408 A KR 20160041408A KR 101641515 B1 KR101641515 B1 KR 101641515B1
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South Korea
Prior art keywords
partial discharge
discharge amount
data recording
switchboard
hfct
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KR1020160041408A
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Korean (ko)
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김대균
고한우
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(주)서전기전
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/20—Bus-bar or other wiring layouts, e.g. in cubicles, in switchyards
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/088—Aspects of digital computing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
    • G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/24—Circuit arrangements for boards or switchyards

Abstract

A switchboard applying a diagnosis device with an HFCT therein according to the present invention comprises: a partial discharge detection sensor which outputs a voltage signal corresponding to partial discharge (PD) leaking from a bushing portion insulating a space between an incoming and distribution switchboard and a bus bar by surrounding an electrical line for each section in the incoming and distribution switchboard, a ground line for each device installed in the incoming and distribution switchboard, or the bus bar with an insulation material; a data recording-type diagnosis device which converts an analog signal outputted from the partial discharge detection sensor into a digital value, converts the digital value into partial discharge, and measures partial discharge generated from the bushing portion insulating the space between the incoming and distribution switchboard and the bus bar by surrounding the electrical line for each section in the incoming and distribution switchboard, the ground line for each device installed in the incoming and distribution switchboard, or the bus bar with the insulation material; a precise diagnosis device which more precisely measures the partial discharge than the data recording-type diagnosis device by using the partial discharge detection sensor when the partial discharge in the incoming and distribution switchboard is detected by the data recording-type diagnosis device; and a switching box which connects the partial discharge detection sensor connected to the data recording-type diagnosis device to the precise diagnosis device when the partial discharge in the incoming and distribution switchboard is measured by the data recording-type diagnosis device.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an HFCT-

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an ASSEMBLY to which a diagnosis apparatus having an HFCT is incorporated, and more particularly, to an ASSEMBLY to which a diagnostic apparatus with HFCT capable of detecting a partial discharge in a switchboard is incorporated.

Generally, partial discharge is a local electrical discharge occurring in an insulation system.

The partial discharge is referred to as a partial discharge because it occurs in a part of the insulator and does not cause complete dielectric breakdown between the electrodes.

These partial discharges are generated in the voids or cavities of solid or liquid dielectrics, surface discharges occurring at the interface of different insulating materials, or in the case of strong inhomogeneous forces, Corona discharges, and electrical tree discharges caused by the sustained effect of discharges in solid dielectrics.

The partial discharge is generated by loss of dielectric strength due to equipment manufacturing and installation defects, maintenance defects, operational stress, and natural deterioration. Normally, detection of such partial discharges results in reduction of energy Can be performed by detecting the conversion.

In order to measure the partial discharge, a measurement device using a transient earth voltage (TEV) sensor is used for a 25.8 kV gas insulated switchgear, and a UHF (Ultra High Frequency) sensor is used for a 170 kV gas insulated switchgear To measure the partial discharge.

The measurement of the partial discharge using the TEV sensor is performed by attaching a capacitive sensor for detecting the degree of deterioration of the insulation to the enclosure of the gas insulated switchgear so that the surface of the enclosure The transient ground voltage detected by the capacitance sensor is transmitted to the measuring device and analyzed to measure the degree of insulation deterioration inside the gas insulated switchgear.

The UHF sensor detects the partial discharge by UHF sensor attached to the gas insulated switchgear, detects the UHF band radio signal emitted when the partial discharge inside the gas insulated switchgear is generated, A partial discharge type is derived by analyzing the pattern of the measurement signal sensed by the partial discharge signal, and the approximate partial discharge generation position is tracked by the size of the partial discharge signal.

However, the partial discharge measurement using the TEV sensor developed at present lacks reliability due to excessive noise, and the partial discharge measuring method using the UHF sensor is expensive and difficult to carry.

As a prior art of the present invention, "a device and a method for diagnosing a partial discharge of a high-voltage power device using a plurality of sensors" is disclosed and disclosed in Korean Patent Laid-Open Publication No. 10-2013-0047418. An apparatus for diagnosing a partial discharge of a high-voltage power device, comprising: a plurality of sensors having different signal frequency ranges to be measured; and a controller for sampling a signal detected by the plurality of sensors A plurality of sensor-specific modules for converting the digital signals into digital signals, and a signal processor for processing the digital signals converted from the plurality of sensor-specific modules and analyzing the types of partial discharges.

Korean Patent Publication No. 10-2010-0022785 (Mar. 3, 2010) Korean Patent Publication No. 10-2013-0047418 (May 31, 2013) Korean Registered Patent No. 10-1553005 (2015.10.01)

Accordingly, the present invention provides an ASSEMBLY using an HFCT-embedded diagnostic device capable of reducing economic losses by detecting an occurrence of a partial discharge due to deterioration of insulation performance in a switchboard, There is a purpose of.

It is a further object of the present invention to provide an electrical switchboard to which a diagnosis apparatus having a built-in HFCT capable of verifying the occurrence of a partial discharge for each section of a switchboard and each device is applied.

It is still another object of the present invention to provide an ASSEMBLY to which a diagnosis apparatus having a built-in HFCT capable of discriminating whether a partial discharge has occurred in the interior of a switchboard or an outside of a switchboard has been applied.

In order to accomplish the above object, the present invention provides an electrical switchboard to which an HFCT embedded diagnosis device is applied, comprising: a ground line for each equipment installed in each section of the switchgear, a grounding line for each equipment installed in the switchboard, or an insulation material between the switchboard and the busbar A partial discharge amount detecting sensor for outputting a voltage signal corresponding to a partial discharge amount (PD) leaked from the bushing portion; The analog signal output from the partial discharge amount detecting sensor is converted into a digital value and the digital value is converted into a partial discharge amount so that the ground line or the bus bar of each equipment installed in each section of the switchgear, A data recording type diagnostic device for measuring a partial discharge amount generated from a bushing portion for insulating between a busbar and a busbar; When the partial discharge amount in the switchboard is detected by the data recording type diagnostic apparatus, the partial discharge amount is more precisely measured than the data recording type diagnostic apparatus by using the partial discharge amount detection sensor to determine the position where the partial discharge in the busbar is generated Precision diagnostic equipment; And a switching box for connecting a partial discharge amount detecting sensor connected to the data recording type diagnostic apparatus to the precision diagnostic apparatus when the partial discharge in the switchgear is measured by the data recording type diagnostic apparatus.

The switchboard to which the diagnostic apparatus with the built-in HFCT according to the present invention is applied according to the present invention is configured such that an electric line for each section in the switchboard or a ground line for each device installed in the switchboard or a busbar is surrounded by an insulating material, A partial discharge amount leaked from the insulating bushing portion, the number of times the partial discharge occurred, and a peak value of the partial discharge are measured.

When the partial discharge amount and the number of times of partial discharge exceed the set value, or when the peak value and the partial discharge amount of the partial discharge amount exceed the set value, the partial discharge amount is precisely measured secondarily using the precision diagnosis device, Or whether the partial discharge is generated internally or externally.

Accordingly, the present invention can minimize an economic loss by detecting an occurrence of a partial discharge due to deterioration of insulation performance in a switchboard, thereby preventing an accident.

In addition, the present invention can confirm whether partial discharge has occurred for each section of the switchgear and for each device, and can determine whether a partial discharge has occurred inside the switchgear or whether a partial discharge has flowed from outside the switchgear.

1 is a view showing installation positions of a HFCT in a switchboard, a switching box, a precise diagnosis device and a data recording type diagnosis device,
2 is a control block diagram of a data recording type diagnostic apparatus;
3 is a control circuit diagram of the first filter,
4 is a flow chart summarizing the procedure for analyzing the partial discharge amount measured by the data recording diagnostic apparatus and transmitting an accident risk message or a caution message in three cases,
FIG. 5 is a control block diagram of a fine diagnostic apparatus. FIG.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The switchboard to which the diagnosis apparatus with the HFCT built therein according to the present invention is applied can be realized by connecting the electric line or the grounding unit of each device in the switchboard 1 or the grounding unit of the switchboard 1 surrounded by the insulating material, A partial discharge amount detecting sensor 3 for outputting a voltage signal corresponding to a partial discharge amount (PD) leaked from a bushing portion for insulating between the bus bar and the bus bar; (1), and converts the analog value output from the partial discharge amount detecting sensor (3) into a digital value and converts the digital value into a partial discharge amount, A data recording type diagnostic apparatus 5 for measuring a partial discharge amount generated from a bushing portion which surrounds a line or a bus bar with an insulating material and insulates the busbar 1 from the bus bar; When the partial discharge amount in the switchboard 1 is detected by the data recording type diagnostic apparatus 5, the partial discharge amount detection sensor 3 is used to more accurately detect the partial discharge amount A precise diagnosis device 7 for measuring the position where the partial discharge in the switchboard 1 is measured; And a partial discharge amount detection sensor (3) connected to the data recording type diagnostic device (5) when the partial discharge in the switchgear (1) is measured by the data recording type diagnostic device And a switching box (9).

It is preferable that the partial discharge amount detecting sensor 3 is composed of two or more HFCTs 11 (High Frequency Current Transformers).

As shown in FIG. 2, the data recording type diagnostic apparatus 5 includes a first signal input unit 13 receiving an electric signal output from the at least two HFCTs 11, a first signal input unit 13 A first filter 15 for removing unnecessary high-frequency noise components from the electrical signals output from the HFCT 11 inputted through the first filter 15, a first filter 15 for converting an analog voltage output from the first filter 15 into a digital value, / D converter 17 and a first controller 19 for converting the digital value output from the first A / D converter 17 into a partial discharge amount.

For example, the first filter 15 may use a low-pass filter for attenuating a high-frequency component. The low-pass filter may be simply an RC low-pass filter, a Bessel filter, a Butterworth filter, A Chebyshev filter can be used.

The first filter 15 may be a low pass Bessel Sallen-Key filter having a three stage structure as in the first embodiment shown in FIG. 3. The low pass Bessel Sallen- The Bessel Salen key filter attenuates the high frequency component output from the HFCT 11 in order.

As shown in FIG. 3, the lowpass Bessel Salen key filter includes a first resistor 77 having one end connected to the output terminal of the HFCT 11 and the other end connected to the non-inverting input terminal of the first operational amplifier 75, A first capacitor 79 having one end connected to the other end of the first resistor 77 and the other end grounded and a first stage filter composed of a first operational amplifier 75 connected to the inverting input terminal and the output terminal.

The first stage filter includes a first stage filter

Figure 112016032676319-pat00001
Thereby attenuating the subsequent signals.

3, the lowpass Bessel Salen key filter includes a second resistor 81 whose one end is connected to the output terminal of the first stage filter and a second resistor 81 whose one end is connected to the other end of the second resistor 81, A second resistor 85 connected to the noninverting input terminal of the second operational amplifier 83, a second capacitor 87 having one terminal connected to the noninverting input terminal of the second operational amplifier 83 and the other terminal grounded, A third capacitor 89 connected to the other end of the second resistor 81 and the other end connected to the output terminal of the second operational amplifier 83 and a second operational amplifier 83 connected to the inverting input terminal and the output terminal, Respectively.

Wherein the second stage filter comprises:

Figure 112016032676319-pat00002
Thereby attenuating the subsequent signals.

3, the lowpass Bessel salen key filter includes a fourth resistor 91 whose one end is connected to the output terminal of the second stage filter, and a fourth resistor 91 whose one end is connected to the other end of the fourth resistor 91, A fifth resistor 95 connected to the noninverting input terminal of the third operational amplifier 93, a fourth capacitor 97 having one end connected to the non-inverting input terminal of the third operational amplifier 93 and the other terminal grounded, A fifth capacitor 99 connected to the other end of the fourth resistor 91 and the other end connected to the output terminal of the third operational amplifier 93 and a third operational amplifier 93 composed of a third operational amplifier 93 connected to the inverting input terminal and the output terminal, Respectively.

Wherein the third stage filter comprises: a signal output from the second stage filter

Figure 112016032676319-pat00003
Thereby attenuating the subsequent signals.

The data recording type diagnostic apparatus 5 sets the peak value of the partial discharge amount, the number of times of partial discharge, or the peak discharge amount of the partial discharge amount, A first digital input interface 23 for instructing the first digital input interface 23 to record the discharge amount and a second digital input interface 23 for controlling the first digital input interface 23 so that the partial discharge amount converted by the first control unit 19 exceeds the upper limit value of the partial discharge amount, A first partial discharge amount analyzing unit 25 for checking whether the measured partial discharge amount exceeds a predetermined peak value and whether the measured partial discharge amount is greater than a predetermined peak value, Or to transmit a drive command of the upper system to the first control unit 19 to allow the first control unit 19 to measure the partial discharge amount 27).

The data recording type diagnostic apparatus 5 further includes a first downloader 29 for allowing the first control unit 19 to download an operation program for measuring a partial discharge amount or recording a measured partial discharge amount, A first clock signal generating unit 31 for providing a reference clock signal to the first control unit 19 and a second clock signal generating unit 31 for generating a clock signal for recording an amount of partial discharge, A second memory unit 35 for storing a partial discharge amount measured by the first control unit 19 and a second memory unit 35 for storing data of the first type, A first NVRAM 37 providing an initial configuration file may be additionally mounted.

In addition, the data recording type diagnostic apparatus 5 may include an upper limit value of a partial discharge amount for transmitting an accident risk message or a caution message when the partial discharge amount measured by the first control unit 19 is displayed or exceeded, Or a first display portion 39 for displaying a peak value of the partial discharge amount.

The data recording type diagnostic apparatus 5 further includes a first power supply unit 41 for converting the input 220V AC voltage to a low voltage and then rectifying the voltage to convert it to a low voltage DC power.

As shown in FIG. 4, the data recording type diagnostic apparatus 5 having the above-described configuration measures a partial discharge amount with time, a number of times of partial discharge, and a peak value of the partial discharge amount. (S1)

When the measured partial discharge amount is larger than the upper limit value of the set partial discharge amount (S3) and the number of times the partial discharge has occurred exceeds the set reference value, the data recording type diagnostic apparatus 5 displays the first display 39 or the first communication interface 27) (S5).

On the other hand, when the measured partial discharge amount is larger than the upper limit value of the set partial discharge amount, (S3) when the number of times that the partial discharge has occurred does not exceed the set reference value, Message can be transmitted.

The peak value of the measured partial discharge amount is larger than the peak value of the set partial discharge amount (S7), and the measured partial discharge amount is smaller than the upper limit value of the set partial discharge amount (S9), it is possible to transmit an accident risk message through the first display unit 39 or the first communication interface 27. [

On the other hand, if the peak value of the measured partial discharge amount is larger than the peak value of the set partial discharge amount but the measured partial discharge amount is not larger than the upper limit value of the set partial discharge amount, Lt; RTI ID = 0.0 > 1 < / RTI >

When the number of times of partial discharge has exceeded the set reference value and the measured partial discharge amount is larger than the upper limit value of the set partial discharge amount, the data recording type diagnostic apparatus 5 determines that the first display portion 39 or the first An accident risk message can be transmitted through the communication interface 27. (S13)

On the other hand, if the number of times the partial discharge has exceeded the set reference value but the measured partial discharge amount is not larger than the upper limit value of the set partial discharge amount, the attention message can be transmitted through the display unit or the first communication interface 27.

As shown in FIG. 5, the precise diagnosis apparatus 7 includes a second signal input section 43 for receiving an electric signal from two or more HFCTs 11 via the switching box 9, A second filter 45 for removing unnecessary high frequency noise components from the electrical signals output from the HFCT 11 inputted through the input unit 43, and a second filter 45 for converting the analog voltage output from the second filter 45 into a digital value A second A / D conversion unit 47, and a second control unit 49 for converting the digital value output from the second A / D conversion unit 47 into a partial discharge amount.

For example, the second filter 45 may use a low-pass filter that attenuates a high-frequency component. The low-pass filter may be an RC low-pass filter, a Bessel filter, a Butterworth filter, Or a Chebyshev filter.

The resolution and the sampling rate of the second A / D converter 47 of the above-described precise diagnostic apparatus 7 are determined based on the resolution of the first A / D converter 17 of the data recording type diagnostic apparatus 5 So that the electric signal output from the HFCT 11 can be captured more precisely.

Further, the above-described precise diagnosis device 7 sets the peak value of the partial discharge amount, the number of times of the partial discharge, or the peak discharge amount of the partial discharge amount, which transmits the accident risk message or the caution message, A partial discharge position analyzing unit 55 for tracking the position where the partial discharge is generated by using the partial discharge amount converted by the second control unit 49, And a second communication interface 57 for transmitting the measured partial discharge amount to the upper system or transmitting the drive command of the upper system to the second control unit 49 so that the second control unit 49 measures the partial discharge amount do.

The fine diagnostic apparatus 7 further includes a second downloader 59 for allowing the second control unit 49 to download an operation program for measuring the partial discharge amount or recording the measured partial discharge amount, A second clock signal generator 61 for providing a reference clock signal to the first clock signal generator 49 and an operation program for measuring the partial discharge amount or recording the measured partial discharge amount by the second controller 49 A fourth memory unit 65 for storing the partial discharge amount measured by the second control unit 49 and a second memory unit 65 for storing the partial discharge amount measured by the second control unit 49, A second NVRAM 67 providing an initial configuration file may be additionally mounted.

The fine diagnosis apparatus 7 further includes a second display section 69 for displaying the partial discharge amount measured by the second control section, as shown in Fig.

The precision diagnostic apparatus 7 further includes a second power supply unit 71 that converts the input 220V AC voltage to a low voltage and then rectifies it to convert it to a low voltage DC power.

The precision diagnosing apparatus 7 further includes a partial discharge inflow position determining unit 73 for determining whether the partial discharge is generated from the internal electrical line or apparatus or from the outside of the switchboard 1.

The switchboard to which the diagnosis device with the HFCT built in according to the present invention is applied is configured such that the electric line for each section in the switchboard 1 or the ground line for each device installed in the switchboard 1 or the busbar is surrounded by an insulating material The amount of partial discharge, the number of partial discharge, and the peak value of partial discharge leaked from the bushing portion that insulates the busbar 1 from the busbar 1 are measured.

When the partial discharge amount and the number of times of the partial discharge exceed the set value, or when the peak value and the partial discharge amount of the partial discharge amount exceed the set value, the partial discharge amount is secondarily measured using the precision diagnosis device (7) It is detected whether the partial discharge occurs or whether the partial discharge is externally introduced.

Accordingly, the present invention can reduce an economic loss by detecting an occurrence of a partial discharge due to deterioration of insulation performance in the switchboard 1, thereby preventing an accident.

The present invention can confirm whether partial discharge has occurred for each section of the switchboard 1 and whether or not partial discharge has occurred for each device and whether or not the partial discharge has occurred inside the switchboard 1 or entered from outside the switchboard 1 Can be distinguished.

1. Switchgear 3. Partial discharge quantity detection sensor
5. Data recording type diagnostic device 7. Precision diagnosis device
9. Switching box 11. HFCT
13. First signal input section 15. First filter
17. First A / D conversion unit 19. First control unit
23. First digital input interface 25. First partial discharge amount analysis section
29. First downloader 31. First clock signal generator
33. A first memory unit 35. A second memory unit
37. First NVRAM 39. First display
41. First power supply 43. Second signal input
45. A second filter 47. A second A /
53. Second digital input interface 55. Partial discharge position analyzer
57. Second communication interface 59. Second downloader
61. Second Clock Signal Generator 63. Third Memory Part
65. Fourth Memory Unit 67. Second NVRAM
69. Second display section 71. Second power supply section
73. Partial discharge inflow position determination unit 75. First operational amplifier
77. First resistor 79. First capacitor
81. Second resistor 83. Second op amp
85. Third resistor 87. Second capacitor
89. Third capacitor 91. Fourth resistor
93. Third Op Amp 95. The fifth resistor
97. Fourth capacitor 99. A fifth capacitor

Claims (4)

(1), a grounding part for each equipment installed in a live wire or a switchboard (1) for each section in the switchboard (1), or a partly leaked part in a bushing part for insulating the busbar A partial discharge amount detecting sensor 3 for outputting a voltage signal corresponding to a total amount of discharge (PD);
(1), and converts the analog value output from the partial discharge amount detecting sensor (3) into a digital value and converts the digital value into a partial discharge amount, A data recording type diagnostic apparatus 5 for measuring a partial discharge amount generated from a bushing portion which surrounds a line or a bus bar with an insulating material and insulates the busbar 1 from the bus bar;
When the partial discharge amount in the switchboard 1 is detected by the data recording type diagnostic apparatus 5, the partial discharge amount detection sensor 3 is used to more accurately detect the partial discharge amount A precise diagnosis device 7 for measuring the position where the partial discharge in the switchboard 1 is measured;
And a partial discharge amount detection sensor (3) connected to the data recording type diagnostic device (5) when the partial discharge in the switchgear (1) is measured by the data recording type diagnostic device And a switching box (9)
The partial discharge amount detection sensor 3 is at least two HFCT 11 (High Frequency Current Transformer)
The data recording type diagnostic apparatus 5 includes a first signal input unit 13 for receiving an electric signal output from the at least two HFCTs 11 and a second signal input unit 13 for receiving an HFCT 11 A first A / D converter 17 for converting an analog voltage output from the first filter 15 into a digital value, a second A / D converter 17 for converting an analog voltage output from the first filter 15 into a digital value, And a first controller (19) for converting the digital value output from the first A / D converter (17) into a partial discharge amount,
The data recording type diagnostic apparatus 5 sets the peak value of the partial discharge amount, the number of times of the partial discharge, or the peak discharge amount of the partial discharge amount, which transmits the accident risk message or the caution message, A first digital input interface 23 for instructing to record an input signal,
It is checked whether or not the partial discharge amount converted by the first control unit 19 exceeds the upper limit value of the partial discharge amount or the number of times that the partial discharge has occurred exceeds the reference value or the measured partial discharge amount exceeds the set peak value A first partial discharge amount analyzer 25,
And the measured partial discharge amount to the upper system so that the upper system monitors the partial discharge amount or transmits the drive command of the upper system to the first control unit 19 so that the first control unit 19 measures the partial discharge amount Further comprising a first communication interface (27)
The precision diagnostic apparatus 7 includes a second signal input unit 43 for receiving an electric signal from two or more HFCTs 11 via the switching box 9, A second filter 45 for removing unnecessary high frequency noise components from the electrical signals output from the HFCT 11, a second A / D converter (not shown) for converting the analog voltage output from the second filter 45 into a digital value 47), and a second controller (49) for converting the digital value output from the second A / D converter (47) into a partial discharge amount,
The resolution and the sampling rate of the second A / D converter 47 of the above-described precise diagnostic apparatus 7 are determined based on the resolution of the first A / D converter 17 of the data recording type diagnostic apparatus 5 Higher than the sampling rate,
A partial discharge position analyzer 55 for tracking the position where the partial discharge is generated by using the partial discharge amount converted by the second controller 49,
And a second communication interface 57 for transmitting the measured partial discharge amount to the upper system or transmitting the drive command of the upper system to the second control unit 49 so that the second control unit 49 measures the partial discharge amount Wherein the HFCT is installed in the cabinet.
delete delete The method according to claim 1,
The precise diagnosis apparatus 7 further includes a partial discharge inflow position determining unit 73 for determining whether the partial discharge is generated from the internal electric line or apparatus or from the outside of the switchboard 1 A switchboard to which a diagnostic device with built-in HFCT is applied.
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KR101892867B1 (en) * 2017-09-19 2018-08-28 홍영일 The air circulation real-time monitoring system of a machine tool's interior through image analysis
WO2020179976A1 (en) * 2019-03-05 2020-09-10 엘에스일렉트릭 주식회사 System and apparatus for monitoring partial discharges in switchboards
KR102221399B1 (en) * 2019-11-18 2021-02-26 이태희 PD measuring device with multi-measurement input conversion
US20210373065A1 (en) * 2018-12-12 2021-12-02 Hitachi, Ltd. Partial discharge detection apparatus and partial discharge detection method
WO2023003242A1 (en) * 2021-07-19 2023-01-26 효성중공업 주식회사 Battery fire prevention and diagnosis system

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