WO2023210048A1 - Détecteur de décharge partielle - Google Patents

Détecteur de décharge partielle Download PDF

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Publication number
WO2023210048A1
WO2023210048A1 PCT/JP2022/042571 JP2022042571W WO2023210048A1 WO 2023210048 A1 WO2023210048 A1 WO 2023210048A1 JP 2022042571 W JP2022042571 W JP 2022042571W WO 2023210048 A1 WO2023210048 A1 WO 2023210048A1
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WO
WIPO (PCT)
Prior art keywords
partial discharge
sensor
detection device
discharge detection
ground voltage
Prior art date
Application number
PCT/JP2022/042571
Other languages
English (en)
Japanese (ja)
Inventor
喬文 細野
淳 額賀
深大 佐藤
Original Assignee
株式会社日立産機システム
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社日立産機システム filed Critical 株式会社日立産機システム
Publication of WO2023210048A1 publication Critical patent/WO2023210048A1/fr

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    • 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

Definitions

  • the present invention relates to a partial discharge detection device.
  • the switchboard is configured to ensure safety by interrupting the current with a circuit breaker in the event of an accident, and if a failure due to deterioration occurs, the ripple effects will be wide-ranging, so diagnosis is required.
  • Patent Document 1 discloses a technique for a partial discharge detection device that detects partial discharge generated in power equipment with high sensitivity. However, Patent Document 1 does not consider whether partial discharge occurs inside or outside the power equipment.
  • An object of the present invention is to provide a partial discharge detection device that can detect the occurrence of partial discharge inside an object whose partial discharge is to be detected.
  • a preferred example of the present invention is a partial discharge detection device for detecting partial discharge in an object, which includes: a first sensor for measuring a transient ground voltage placed on a grounded conductor;
  • the partial discharge detection device includes a second sensor that measures ground voltage, and an output unit that outputs the presence or absence of partial discharge in the object based on signals from the first sensor and the second sensor.
  • FIG. 2 is a diagram showing the configuration of a switchboard according to the first embodiment.
  • 3 is a diagram showing a graph of a sensor signal of Example 1.
  • FIG. 7 is a diagram showing a graph obtained by Fourier transforming the signal of Example 2.
  • Example 1 will be explained using FIGS. 1 and 2.
  • the switchboard 4 of this embodiment has a circuit breaker 1 arranged therein, and has a structure covered by a metal container 9, and the metal container 9 is grounded.
  • the circuit breaker 1 is connected by a cable (power transmission side) 2 and a cable (power distribution side) 3.
  • a sensor 6 (disposed outside the metal container) capable of measuring transient ground voltage is arranged outside the metal container 9. Further, a sensor 7 (disposed on the grounded metal plate) capable of measuring a transient ground voltage is also disposed on a grounded metal plate 8 disposed outside the switchboard. Signals from a sensor (placed on the outside of the metal container) 6 and a sensor (placed on a grounded metal plate) 7 are measured with an oscilloscope 5.
  • an induced current 41 flows through the external partial discharge 12 generated in the insulator 21, and signals are acquired by a sensor (placed on the outside of the metal container) 6 and a sensor (placed on a grounded metal plate) 7. Therefore, as shown in Fig. 2, when a partial discharge 11 occurs inside, a signal is generated only from the sensor (placed outside the metal container), but when a partial discharge occurs outside, a signal is generated from the sensor (placed outside the metal container). Signals are generated both at the sensor (located on the outside) 6 and at the sensor (located on the grounded metal plate) 7.
  • the vertical axis shows the transient ground voltage V detected by the sensor 6, and the horizontal axis shows time t.
  • the vertical axis indicates the transient ground voltage V detected by the sensor 7, and the horizontal axis indicates time t.
  • the upper diagram in FIG. 2 and the lower diagram in FIG. 2 show cases where a partial discharge occurs inside the switchboard 4 and then a partial discharge occurs outside the switchboard 4.
  • the temporal changes in the signals in the upper diagram of FIG. 2 and the lower diagram of FIG. 2 can be observed with the oscilloscope 5. From the output of the signal that can be observed with the oscilloscope 5, the user can detect the presence or absence of partial discharge inside the switchboard.
  • FIG. 1 shows an example using one switchboard 4, sensors 6 and 7, and one oscilloscope 5 that outputs signals from the sensors 6 and 7.
  • the present invention is not limited to this example, and two sensors may be arranged in each of the plurality of switchboards 4, and the output unit for determining the presence or absence of partial discharge in each of the plurality of switchboards 4 may be configured by a computer.
  • This computer is a server connected to sensors of a plurality of switchboards 4, and is configured as a data center that determines whether a partial discharge occurring in the switchboard 4 is an internal partial discharge or an external partial discharge. You can also do this.
  • the presence or absence of partial discharge inside the switchboard can be automatically determined by comparing the timing of generation of the transient ground voltage generated by the above-described sensor 6 and sensor 7.
  • the determination result is not limited to outputting the time change of the signal, but also includes information such as the presence or absence of internal partial discharge, the time of occurrence of internal partial discharge, and the number of past occurrences of internal partial discharge. may be displayed on the monitor.
  • the insulator 21 is shown as an example, and may be any location where a partial discharge occurs outside the switchboard. Therefore, since it is necessary to arrange the sensor 7 (placed on a grounded metal plate) at each location where partial discharge occurs, it is assumed that a plurality of sensors 7 are often installed.
  • Example 2 will be explained using FIG. 3. Note that descriptions of parts that overlap with those in Example 1 will be omitted here.
  • Example 1 there were cases where determination could not be made due to the influence of noise, so in this example, a configuration was adopted in which partial discharge was detected while reducing the influence of noise.
  • the upper diagram in FIG. 3 shows a graph obtained by Fourier transform of the signal detected by sensor 6 or sensor 7 in the case where partial discharge occurs in the switchboard.
  • the lower diagram in FIG. 3 shows a graph obtained by Fourier transform of the signal detected by sensor 6 or sensor 7 in the case where no partial discharge occurs in the switchboard.
  • the vertical axis shows amplitude and the horizontal axis shows frequency.
  • the frequency bands differ between when partial discharge occurs and where partial discharge does not occur. As shown in the upper diagram of FIG. 3, the frequency band of partial discharge occurs at a lower frequency than the frequency band of noise. Therefore, the occurrence of partial discharge can be ascertained by determining the difference in frequency bands.
  • the configuration is such that the frequency band of noise in the switchboard is detected and the signal from the sensor 6 or sensor 7 is passed through a filter (notch filter) that removes the frequency band of the noise.
  • the structure is such that the signal from the sensor 6 or the sensor 7 is passed through a filter that passes only the signal in the partial discharge frequency band.
  • the signal from sensor 6 or sensor 7 from which noise has been removed is sent to the oscilloscope or determination server as in embodiment 1, and the noise is removed.
  • the presence or absence of partial discharge inside the switchboard can be detected with less influence.
  • a switchboard was used as an example of an object for detecting partial discharge, but the present invention can be applied to detecting partial discharge in other objects such as a gas circuit breaker.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Relating To Insulation (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

Un détecteur de décharge partielle pour détecter une décharge partielle dans un objet, le détecteur de décharge partielle comprenant : un premier capteur qui est disposé sur un conducteur mis à la terre et mesure une tension de masse transitoire ; un second capteur qui est disposé sur un objet et mesure une tension de masse transitoire ; et une unité de sortie qui utilise les signaux provenant du premier capteur et du second capteur en tant que base pour délivrer en sortie s'il existe une décharge partielle dans l'objet.
PCT/JP2022/042571 2022-04-28 2022-11-16 Détecteur de décharge partielle WO2023210048A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022075511A JP2023164157A (ja) 2022-04-28 2022-04-28 部分放電検出装置
JP2022-075511 2022-04-28

Publications (1)

Publication Number Publication Date
WO2023210048A1 true WO2023210048A1 (fr) 2023-11-02

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PCT/JP2022/042571 WO2023210048A1 (fr) 2022-04-28 2022-11-16 Détecteur de décharge partielle

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JP (1) JP2023164157A (fr)
WO (1) WO2023210048A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109459674A (zh) * 2018-12-28 2019-03-12 国家电网有限公司 一种开关柜局部放电多节点监测系统同步化装置
JP2019135455A (ja) * 2018-02-05 2019-08-15 日新電機株式会社 マルチセンサを用いた部分放電検出装置
JP2020012726A (ja) * 2018-07-18 2020-01-23 株式会社東芝 部分放電検出システム、学習システム、部分放電検出方法、コンピュータプログラム及び電気機器
JP2021025881A (ja) * 2019-08-06 2021-02-22 Ｊｆｅスチール株式会社 部分放電検出装置および部分放電監視システム
JP2022032335A (ja) * 2020-08-11 2022-02-25 株式会社東芝 変圧器及び部分放電判定方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019135455A (ja) * 2018-02-05 2019-08-15 日新電機株式会社 マルチセンサを用いた部分放電検出装置
JP2020012726A (ja) * 2018-07-18 2020-01-23 株式会社東芝 部分放電検出システム、学習システム、部分放電検出方法、コンピュータプログラム及び電気機器
CN109459674A (zh) * 2018-12-28 2019-03-12 国家电网有限公司 一种开关柜局部放电多节点监测系统同步化装置
JP2021025881A (ja) * 2019-08-06 2021-02-22 Ｊｆｅスチール株式会社 部分放電検出装置および部分放電監視システム
JP2022032335A (ja) * 2020-08-11 2022-02-25 株式会社東芝 変圧器及び部分放電判定方法

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