WO2022130481A1 - 零相変流器の平衡特性試験装置 - Google Patents

零相変流器の平衡特性試験装置 Download PDF

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Publication number
WO2022130481A1
WO2022130481A1 PCT/JP2020/046657 JP2020046657W WO2022130481A1 WO 2022130481 A1 WO2022130481 A1 WO 2022130481A1 JP 2020046657 W JP2020046657 W JP 2020046657W WO 2022130481 A1 WO2022130481 A1 WO 2022130481A1
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WO
WIPO (PCT)
Prior art keywords
zero
phase current
current transformer
current
characteristic test
Prior art date
Application number
PCT/JP2020/046657
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English (en)
French (fr)
Japanese (ja)
Inventor
仁 米田
俊彦 宮内
勇治 大野
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2020/046657 priority Critical patent/WO2022130481A1/ja
Priority to JP2022569352A priority patent/JP7378644B2/ja
Priority to KR1020237000927A priority patent/KR102733342B1/ko
Priority to CN202080107685.3A priority patent/CN116529842A/zh
Publication of WO2022130481A1 publication Critical patent/WO2022130481A1/ja

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/14—Indicating direction of current; Indicating polarity of voltage
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
    • 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
    • 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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/62—Testing of transformers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase AC
    • H01F38/28—Current transformers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

Definitions

  • This application relates to an equilibrium characteristic test device for a zero-phase current transformer.
  • the zero-phase current transformer that detects the zero-phase current when a ground fault occurs detects the imbalance of the current of the through conductor caused by the ground fault current and outputs the secondary current.
  • the unbalanced component of the zero-phase current transformer itself is large, a secondary current will be generated even when a balanced current is input to the primary side of the zero-phase current transformer. , Causes false positives. Therefore, an equilibrium characteristic test is conducted to confirm that the magnitude of the secondary current is equal to or less than the specified value by energizing the primary side of the zero-phase current transformer with an equilibrium current several times the rated current.
  • the present application has been made to solve the above-mentioned problems, and an object thereof is to provide an equilibrium characteristic test apparatus for a zero-phase current transformer capable of performing an equilibrium characteristic test using a current source having a small output. do.
  • the balance characteristic test apparatus of the zero-phase current transformer disclosed in the present application includes an electric wire installed so that a plurality of reciprocating parts penetrate through a through hole of the zero-phase current transformer, and a current source for passing a direct current through the electric wire. It is equipped with an ammeter that measures the magnitude of the secondary current of the zero-phase current transformer.
  • the balance characteristic test apparatus of the zero-phase current transformer disclosed in the present application includes an electric wire installed so that a plurality of reciprocating parts penetrate through a through hole of the zero-phase current transformer, and a current source for passing a direct current through the electric wire. Since it is equipped with an ammeter that measures the magnitude of the secondary current of the zero-phase current transformer, it is possible to perform tests using a current source with a small output, and it is possible to perform tests with a small and inexpensive device. can.
  • FIG. It is a figure which shows the structure of the equilibrium characteristic test apparatus of the zero-phase current transformer according to Embodiment 1.
  • FIG. It is a figure which shows the structure of the equilibrium characteristic test apparatus of the comparative example. It is a figure which shows the structure of the equilibrium characteristic test apparatus of the zero-phase current transformer according to Embodiment 2.
  • FIG. It is a figure which shows the structure of the equilibrium characteristic test apparatus of the zero-phase current transformer according to Embodiment 3.
  • FIG. It is a figure which shows an example of the direction of the electric current flowing through an electric wire in Embodiment 3.
  • FIG. 1 is a diagram showing a configuration of an equilibrium characteristic test apparatus for a zero-phase current transformer according to the first embodiment.
  • the zero-phase current transformer 100 is a test target
  • the equilibrium characteristic test device of the zero-phase current transformer includes an electric wire 1, a current source 2, and an ammeter 3.
  • the electric wire 1 is installed as a lead wire on the primary side of the zero-phase current transformer 100 so that a plurality of reciprocating wires of two or more reciprocations form a set and penetrate the through hole only once.
  • the electric wire 1 is installed so as to penetrate the through hole for two round trips.
  • the current source 2 is electrically connected to both ends of the electric wire 1, and a direct current is passed through the electric wire 1.
  • the ammeter 3 is electrically connected to the secondary current output terminal of the zero-phase current transformer 100, and measures the magnitude of the secondary current of the zero-phase current transformer 100.
  • FIG. 1 it is assumed that the magnitude of the secondary current of the zero-phase current transformer 100 is measured by the ammeter 3, but a load such as a resistor is connected to the secondary current output terminal of the zero-phase current transformer 100 and the load thereof is connected.
  • the magnitude of the secondary current of the zero-phase current changer 100 may be measured by measuring the voltage across the load with a voltmeter or the like.
  • a current is passed from the current source 2 to the electric wire 1 so that an equilibrium current of, for example, 6 times the rated current flows on the primary side of the zero-phase current transformer 100. It is confirmed whether or not the secondary current measured by the ammeter 3 at this time is equal to or less than the specified value.
  • FIG. 2 is a diagram showing a configuration of an equilibrium characteristic test apparatus of a comparative example for explaining the operation of the equilibrium characteristic test apparatus of a zero-phase current transformer, and is shown in FIG. 4 of Patent Document 1 shown in the prior art document.
  • the electric wire 1 is the electric wire 1a and the current source 2 is the current source 2a.
  • Other configurations of the equilibrium characteristic test apparatus of the comparative example are the same as the configuration of the equilibrium characteristic test apparatus according to the first embodiment.
  • the two reciprocating parts of the electric wire 1 are installed so as to penetrate through the through hole, whereas the equilibrium characteristic test apparatus according to the comparative example shown in FIG. Then, one round trip of the electric wire 1a is installed so as to penetrate through the through hole.
  • the operation of the equilibrium characteristic test apparatus of the zero-phase current transformer according to the first embodiment will be described while comparing with the operation of the equilibrium characteristic test apparatus of the comparative example.
  • the equilibrium characteristic test of a zero-phase current transformer it is necessary to energize the primary side of the zero-phase current transformer, for example, with an equilibrium current 6 times the rated current.
  • the rated current of the zero-phase current transformer to be tested for equilibrium characteristics is 100 A, it is necessary to energize the primary side of the zero-phase current transformer with an equilibrium current of 600 A.
  • 300 A may be passed as the current source 2.
  • the balance characteristic test apparatus of the comparative example requires a current source 2a that generates a current of 600 A.
  • the equilibrium characteristic test apparatus according to No. 1 it suffices if there is a current source 2 having a small output that generates a current of 300 A, which is half that of the comparative example. Since the size of the current source depends on the size of the current that can be output, the current source 2 according to the first embodiment can be smaller than the current source 2a according to the comparative example.
  • a current source 2 that is cheaper than the current source 2a according to the comparative example can be used.
  • the equilibrium characteristic test apparatus since the electric wires 1 for a plurality of reciprocations are installed as a set so as to penetrate through the through hole of the zero-phase current transformer 100 only once, the equilibrium characteristic test is performed.
  • the work of penetrating the electric wire 1 through the through hole before the test and the work of pulling out the electric wire 1 from the through hole after the test are very simple as in the equilibrium characteristic test apparatus of the comparative example.
  • the electric wire 1 is installed so as to penetrate the through hole for two round trips, but the electric wire 1 is 2 in the through hole as a lead wire on the primary side of the zero-phase current transformer 100. It suffices if it is installed so as to penetrate a plurality of round trips or more. For example, if three reciprocating parts of the electric wire 1 are installed so as to penetrate through the through hole, when the current of I [A] is passed from the current source 2, I * 3 [A] is on the primary side of the zero-phase current transformer 100. The equilibrium current will be energized, and a current source with a smaller output may be used.
  • the equilibrium characteristic test apparatus for the zero-phase current source is applied to the electric wire 1 installed so that a plurality of reciprocating parts penetrate through the through hole of the zero-phase current source 100 and the electric current 1. Since it is equipped with a current source 2 for passing a direct current and a current meter 3 for measuring the magnitude of the secondary current of the zero-phase current transformer 100, it is possible to perform a balance characteristic test using a current source with a small output. A small and inexpensive current source can be used.
  • FIG. 3 is a diagram showing a configuration of an equilibrium characteristic test apparatus for a zero-phase current transformer according to the second embodiment. Comparing the equilibrium characteristic test apparatus of the zero-phase current transformer according to the second embodiment shown in FIG. 3 with the equilibrium characteristic test apparatus of the zero-phase current transformer according to the first embodiment shown in FIG. As a set, it is covered with the covering 4 and integrated into one lead wire on the primary side. For example, the electric wire 1 covered with the covering 4 is formed by integrally molding the electric wire 1 for a plurality of round trips and an insulator such as resin.
  • Other configurations of the equilibrium characteristic test apparatus of the zero-phase current transformer according to the second embodiment are the same as the configuration of the equilibrium characteristic test apparatus according to the first embodiment.
  • the zero-phase change occurs when the current of I [A] is passed from the current source 2 in the direction of the arrow shown along the electric wire 1.
  • the fact that the equilibrium current of I * 2 [A] is energized on the primary side of the current transformer 100 is the same as that of the equilibrium characteristic test apparatus of the zero-phase current transformer according to the first embodiment. Therefore, the equilibrium characteristic test apparatus for the zero-phase current transformer according to the second embodiment can obtain the same effect as the equilibrium characteristic test apparatus for the zero-phase current transformer according to the first embodiment. Further, in the equilibrium characteristic test apparatus of the zero-phase transmuter according to the second embodiment shown in FIG.
  • the electric wires 1 for a plurality of reciprocations are formed into a set and covered with the covering 4, the electric wires 1 are integrated. It becomes easy to handle the wire 1 for multiple round trips through the through hole before the equilibrium characteristic test, and to pull out the wire 1 for multiple round trips from the through hole after the equilibrium characteristic test. ..
  • the electric wires 1 for a plurality of reciprocating lines are formed as a set and covered with the covering 4 to be integrated.
  • the electric wires 1 for a plurality of round trips may be integrated, and for example, the electric wires 1 for a plurality of round trips may be fixed with a clip or an adhesive to be integrated.
  • the integrated electric wire 1 may be formed into a hard and straight rod shape and installed so as to penetrate through the through hole. In this case, the work of penetrating the electric wire 1 for a plurality of round trips through the through hole before the equilibrium characteristic test and the work of pulling out the electric wire 1 for a plurality of round trips from the through hole after the equilibrium characteristic test are further facilitated.
  • the equilibrium characteristic test apparatus for the zero-phase current source is attached to the electric wire 1 installed so that a plurality of reciprocating parts penetrate through the through hole of the zero-phase current source 100 and the electric current 1.
  • a current source 2 for passing a direct current and a current meter 3 for measuring the magnitude of the secondary current of the zero-phase current transformer 100 are provided, and the electric wires 1 for a plurality of round trips are integrated, so that the output is small.
  • a balance characteristic test can be performed using a source, and a small current source can be used. Further, the work of penetrating the electric wire 1 for a plurality of round trips through the through hole before the equilibrium characteristic test and the work of pulling out the electric wire 1 for a plurality of round trips from the through hole after the equilibrium characteristic test become easy.
  • FIG. 4 is a diagram showing a configuration of an equilibrium characteristic test apparatus for a zero-phase current transformer according to the third embodiment. Comparing the equilibrium characteristic test apparatus of the zero-phase current transformer according to the third embodiment shown in FIG. 4 with the equilibrium characteristic test apparatus of the zero-phase current transformer according to the first embodiment shown in FIG.
  • the first wiring switch 5 is provided in the folded portion
  • the second wiring switch 6 is provided in the folded portion of the electric wire far from the current source 2.
  • a switching indicator 7 for instructing the first wiring switching device 5 and the second wiring switching device 6 to switch the internal wiring through the switching signal line 8 is provided.
  • the current source wire 9a connected to the current source 2 is connected to the penetrating wire 10a through the internal wiring of the first wiring switch 5, and the penetrating wire 10a penetrates the through hole of the zero-phase transmuter, and then the second wiring. It is connected to the through wire 10b through the internal wiring of the switch 6, and after the through wire 10b penetrates the through hole of the zero-phase transmuter, it is connected to the through wire 10c through the internal wiring of the first wiring switch 5.
  • FIG. 5 is a diagram showing an example of arrangement of through wires 10a, 10b, 10c, and 10d in the equilibrium characteristic test apparatus of the zero-phase current transformer according to the third embodiment, and shows four states in which currents flow in different directions. ing.
  • the figure shown in FIG. 5 is a cross-sectional view of the portion where the through wires 10a, 10b, 10c, and 10d penetrate through the through hole of the zero-phase current transformer 100 in FIG. 4 as viewed from the side of the current source 2.
  • the through wires 10a, 10b, 10c, and 10d are arranged so as to form a square at a portion penetrating the through hole of the zero-phase current transformer 100.
  • FIG. 5 shows the through wires 10a, 10b, and 10c when the internal wirings of the first wiring switch 5 and the second wiring switch 6 are in the state shown by the dotted line in FIG. It shows the direction of the current flowing in 10d.
  • a current flows through the through wire 10a and the through wire 10c in the direction from the front to the back in FIG. 5, that is, in the direction away from the current source 2 in FIG. 4, and the through wire 10b and the through wire 10d are from the back to the front in FIG. That is, the current in the direction approaching the current source 2 in FIG. 4 is flowing.
  • the first wiring switch 5 and the second wiring switch 6 switch to one of the four states in which the current flows in different directions shown in FIG. 5 according to the instruction from the switching indicator 7.
  • the connection of the internal wiring of the first wiring switch 5 and the second wiring switch 6 is changed.
  • the first wiring switch 5 and the second wiring switch 6 rotate clockwise in the four states shown in FIG. 5 when the switching instruction is transmitted from the switching indicator 7 through the switching signal line 8.
  • the connection of the internal wiring of the first wiring switch 5 and the second wiring switch 6 is changed so as to switch to.
  • the equilibrium current flowing through the through wires 10a, 10b, 10c, and 10d becomes a state of rotating 90 degrees clockwise in the through hole.
  • the zero-phase current transformer depends on the position of the equilibrium current passing through the through hole of the zero-phase current transformer 100.
  • the magnitude of the secondary current of 100 may change. Therefore, in the equilibrium characteristic test, for example, the secondary current is measured while rotating the electric wire passing through the through hole of the zero-phase current transformer 100, or the secondary current is measured while rotating the zero-phase current transformer itself. However, the largest value among the measured secondary currents was used as the final measured value of the secondary current.
  • the equilibrium characteristic test apparatus of the zero-phase current transformer in each of the four states shown in “upper left”, “upper right”, “lower right” and “lower left” of FIG.
  • the secondary current is measured, and the largest value among the four obtained secondary currents is used as the final measured value of the secondary current.
  • the equilibrium characteristic test device or the zero-phase current transformer 100 is physically moved. It is possible to measure the secondary current by changing the position of the equilibrium current. As a result, the equilibrium characteristic test can be performed in a shorter time than when the electric wire passing through the through hole of the zero-phase current transformer 100 is rotated or when the zero-phase current transformer itself is rotated.
  • the electric wire is installed so as to penetrate the through hole for two round trips. It is the same as the first embodiment that it may be installed so as to penetrate a plurality of round trips. Therefore, in the description with reference to FIG. 5, it is assumed that the through wires 10a, 10b, 10c, and 10d are arranged so as to form a square in the portion penetrating the through hole of the zero-phase current transformer 100, but two or more round trips or more. It suffices if a penetrating electric wire that penetrates a plurality of round trips is arranged. Further, in the description of FIG. 5, when the connection of the internal wiring of the first wiring switch 5 and the second wiring switch 6 is changed so as to switch the four states shown in FIG.
  • the current source wires 9a and 9b, the first wiring switch 5, four or more even through wires, and the second wiring switch 6 make two round trips to the through hole of the zero-phase current transformer.
  • the first wiring so that the direction of the current of the penetrating wire passing through the through hole of the zero-phase transmuter 100 changes in the state of being connected so as to constitute the wire installed so as to penetrate the above multiple reciprocating parts. Any wiring may be used as long as the connection of the internal wiring of the switch 5 and the second wiring switch 6 is changed.
  • the switching indicator 7 instructs the first wiring switching device 5 and the second wiring switching device 6 to switch the internal wiring through the switching signal line 8. Any method may be used as long as it is possible to instruct each of the wiring switch 5 and the second wiring switch 6 to switch the internal wiring.
  • the equilibrium characteristic test apparatus for the zero-phase transmuter includes a plurality of through wires 10a, 10b, 10c, and 10d penetrating through holes of the zero-phase transmuter 100, and a current source 2. And the first wiring switch 5 connected to one end of the through wires 10a, 10b, 10c and 10d, and the second wiring connected to the other end of the through wires 10a, 10b, 10c and 10d.
  • a switching device 6 and a switching indicator 7 for instructing the switching of the internal wiring to the first wiring switching device 5 and the second wiring switching device 6 are provided, and at least the internal wiring of the first wiring switching device 5 and the penetration.
  • the electric wires 10a, 10b, 10c, and 10d and the internal wiring of the second wiring changer 6 constitute an electric wire installed so that a plurality of reciprocating parts penetrate through the through hole of the zero-phase current changer 100. Since the direction of the current flowing through any of the plurality of through wires 10a, 10b, 10c, and 10d penetrating the through hole is changed by the instruction of the switching indicator 7, the balance characteristic test device or the zero-phase current changer 100 is physically used. The position of the equilibrium current can be changed and the secondary current can be measured without moving to, and the equilibrium characteristic test can be performed in a short time.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
  • Housings And Mounting Of Transformers (AREA)
PCT/JP2020/046657 2020-12-15 2020-12-15 零相変流器の平衡特性試験装置 WO2022130481A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PCT/JP2020/046657 WO2022130481A1 (ja) 2020-12-15 2020-12-15 零相変流器の平衡特性試験装置
JP2022569352A JP7378644B2 (ja) 2020-12-15 2020-12-15 零相変流器の平衡特性試験装置
KR1020237000927A KR102733342B1 (ko) 2020-12-15 2020-12-15 영상 변류기의 평형 특성 시험 장치
CN202080107685.3A CN116529842A (zh) 2020-12-15 2020-12-15 零相电流互感器的平衡特性试验装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2020/046657 WO2022130481A1 (ja) 2020-12-15 2020-12-15 零相変流器の平衡特性試験装置

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WO2022130481A1 true WO2022130481A1 (ja) 2022-06-23

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JP (1) JP7378644B2 (enrdf_load_stackoverflow)
KR (1) KR102733342B1 (enrdf_load_stackoverflow)
CN (1) CN116529842A (enrdf_load_stackoverflow)
WO (1) WO2022130481A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024145039A1 (en) * 2022-12-30 2024-07-04 Schneider Electric USA, Inc. Apparatuses, systems, and methods for screening electronic components

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JPS4947120U (enrdf_load_stackoverflow) * 1972-07-31 1974-04-25
JPS5581934U (enrdf_load_stackoverflow) * 1978-11-30 1980-06-05
JPH0421980U (enrdf_load_stackoverflow) * 1990-06-14 1992-02-24
JP2005158810A (ja) * 2003-11-20 2005-06-16 Taiwa Denki Kogyo Kk 零相変流器
JP2014238313A (ja) * 2013-06-07 2014-12-18 三菱電機株式会社 漏洩電流検知装置

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Publication number Priority date Publication date Assignee Title
JPH0421980A (ja) 1990-05-15 1992-01-24 Fujitsu Ltd 磁気ヘッドの支持機構
JP2003234224A (ja) * 2002-02-06 2003-08-22 Mitsubishi Electric Corp 零相変流器に対する導体の配置方法及び保持・位置調整装置
CN203164335U (zh) * 2013-03-27 2013-08-28 国家电网公司 一种tpy电流互感器暂态特性试验电路
JP2015184003A (ja) 2014-03-20 2015-10-22 株式会社関電工 貫通型変流器の試験用巻き線

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
JPS4947120U (enrdf_load_stackoverflow) * 1972-07-31 1974-04-25
JPS5581934U (enrdf_load_stackoverflow) * 1978-11-30 1980-06-05
JPH0421980U (enrdf_load_stackoverflow) * 1990-06-14 1992-02-24
JP2005158810A (ja) * 2003-11-20 2005-06-16 Taiwa Denki Kogyo Kk 零相変流器
JP2014238313A (ja) * 2013-06-07 2014-12-18 三菱電機株式会社 漏洩電流検知装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024145039A1 (en) * 2022-12-30 2024-07-04 Schneider Electric USA, Inc. Apparatuses, systems, and methods for screening electronic components

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JP7378644B2 (ja) 2023-11-13
KR102733342B1 (ko) 2024-11-25
KR20230021742A (ko) 2023-02-14
JPWO2022130481A1 (enrdf_load_stackoverflow) 2022-06-23
CN116529842A (zh) 2023-08-01

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