Aging tests of amorphous current transformers used in ground current transformers used in ground fault interrupters

1990 ◽  
Author(s):  
A. Nafalski ◽  
G. Matras ◽  
A. Wac-Wlodarczyk ◽  
H. Stryczewska
Keyword(s):  
Current Transformers ◽  
Ground Fault ◽  
Ground Current

scholarly journals Forensic Engineering Analysis Of Electric Shock From Ground Fault Circuit Interrupter (GFCI)

2003 ◽  
Vol 20 (2) ◽  
Author(s):  
Richard D. Brugger
Keyword(s):  
Electric Shock ◽  
Electrical Current ◽  
Electrical Circuit ◽  
Engineering Analysis ◽  
Ground Fault ◽  
Ground Current ◽  
Forensic Engineering ◽  
Current Value ◽  
The Difference ◽  
Electrical Wiring

Many Electrical Wiring Systems Include Ground Fault Circuit Interrupters (Gfci) As Protective Elements. The Application Is For Avoidance Of Electric Shock Injuries To A Person In The Event That Their Body Becomes Part Of An Electrical Circuit Path From A Live Wire And Ground. The Theory Behind The Device Is That If There Is A Difference In Electrical Current Flowing Through The Live (120 Volt Ac) Wire And The Neutral Wire, Then The Difference Current Is Flowing To Ground And Is Potentially Hazardous To A Person. Functionally, The Gfci Should Automatically Open The Electrical Circuit Above A Certain Ground Current Value. This Paper Explores How The Circuit May Fail To Provide The Protection For Which It Is Intended, And Result In An Electric Shock.

Aging tests of amorphous current transformers used in ground fault interrupters

1990 ◽  
Vol 26 (5) ◽  
pp. 2005-2007 ◽  
Author(s):  
A. Nafalski ◽  
G. Matras ◽  
A. Wac-Wlodarczyk ◽  
H. Stryczewska
Keyword(s):  
Current Transformers ◽  
Ground Fault

scholarly journals The resistive ground fault of PWM voltage inverter in the EV charging station

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Marta Zurek-Mortka ◽  
Jerzy R. Szymanski
Keyword(s):  
Power Supply ◽  
Common Mode ◽  
Voltage Inverter ◽  
Frequency Converters ◽  
Charging Station ◽  
Ground Fault ◽  
A Value ◽  
Ground Current ◽  
Voltage Frequency ◽  
Flow Through

AbstractDuring the direct touch of the inverter output voltage or with the ungrounded shield of the cable connecting the inverter to the motor or other type of load, the nonsinusoidal ground currents with a basic harmonic frequency between 1.5 and 16 kHz, flow via a human’s body. Here was proved that Residual Current Device (RCD) ($$I_{\triangle n}$$ I ▵ n = 30 mA) does not switch off the power supply when a ground current with a value of about some hundred milliamps occurs. Because RCDs do not disconnect the power supply, the touch on the inverter’s voltage is dangerous to health and life. For the authors, the RCD usage in the Voltage Frequency Converters (VFCs) is not a good engineer practice when high-frequency common-mode distortion currents flow through it. The paper presents tests of RCD operation in the event of a resistance ground fault (via human body) during EV battery charging where the PWM voltage inverter is connected to the external rectifier to provide DC charging battery voltage. Finally, the authors propose a method of eliminating common-mode (CM) current from short protection system by using a separate circuit in which the parasitic leakage current omits an RCD.

scholarly journals Method of Locating Ground Fault in Low Resistance Grounding Distribution Network by Grounding Wire Current

2021 ◽  
Vol 2066 (1) ◽  
pp. 012100
Author(s):  
Bo Yang ◽  
Yuanchun Fan ◽  
Chen Yang ◽  
Jun Xu ◽  
Yang Zhou ◽  
...  
Keyword(s):  
Current Distribution ◽  
Fault Location ◽  
Distribution Networks ◽  
Distribution Law ◽  
Ground Fault ◽  
The Earth ◽  
Ground Current ◽  
Small Resistance ◽  
Urban Distribution ◽  
Earth Electrode

Abstract Three-core cables are increasingly used in urban distribution networks. The shielding layer, armor layer of the three-core cable and the earthing electrode constitute the earth-electrode network. When a ground fault occurs, a regular ground wire current distribution is formed in the network. This paper analyzes the distribution law of ground current, and according to the distribution law, puts forward a kind of grounding fault location method of neutral point small resistance grounding grid, and finally designs and implements the grounding fault location system.

Methods of Getting Zero Sequence Current in a Single-Phase-to-Ground Fault

2012 ◽  
Vol 614-615 ◽  
pp. 891-894
Author(s):  
Yu Xia Li
Keyword(s):  
Single Phase ◽  
Current Transformer ◽  
Fault Line ◽  
Current Transformers ◽  
Ground Fault ◽  
Electronic Current ◽  
Digital Substation ◽  
Current Transducer ◽  
Zero Sequence ◽  
The Common

After a single-phase-to ground fault, fault voltage and current information should be sampled accurately for automatic equipments to detect the fault line. And zero sequence current is the very key element to detect the fault line after an earth fault happens. The widely used methods of getting zero sequence current are in details described. The common methods are by zoro sequence current transformers, by wye connections of three CTs, and by zero-sequence current transducer. A new method by magnetic field induction and the structure of magnetic induction device are introduced, as well as a new way by electronic current transformer and its application in digital substation.

scholarly journals The Resistive Ground Fault of PWM Voltage Inverter In The EV Charging Station

2021 ◽  
Author(s):  
Marta Zurek-Mortka ◽  
Jerzy Ryszard Szymański
Keyword(s):  
Power Supply ◽  
Harmonic Frequency ◽  
Frequency Converters ◽  
Charging Station ◽  
Ground Fault ◽  
A Value ◽  
Ground Current ◽  
Voltage Frequency ◽  
Ev Charging ◽  
Current Device

Abstract During the direct touch of the inverter output voltage, the nonsinusoidal ground currents with a basic harmonic frequency between 1.5 kHz and 16 kHz, flow via a human’s body. Here was proved that Residual Current Device (RCD) type AC/IΔn = 30 mA does not switch off the power supply when a ground current with a value of about some hundred milliamps occurs. Because RCDs do not disconnect the power supply, the touch on the inverter’s voltage is dangerous to the health and life. For the authors, RCD usage in Voltage Frequency Converters is not a good engineer practice. The article presents tests of RCD operation in the event of a ground fault during EV battery charging.

Research on Capacitance Current Treatment Methods in Mine High-Voltage Power Grid

2012 ◽  
Vol 229-231 ◽  
pp. 1021-1024
Author(s):  
Dan Xu ◽  
Na Guo
Keyword(s):  
Coal Mine ◽  
Power Supply ◽  
Single Phase ◽  
Current Treatment ◽  
Automatic Tracking ◽  
Ground Fault ◽  
Arc Suppression Coil ◽  
Testing Data ◽  
Ground Current ◽  
Capacitance Current

In view of the coal mine neutral point ungrounded system when single-phase ground fault occurs, the grounding capacitance current is too big affect the security of coal mine powe supply.The paper analyzed testing data of capacitance current of coal mine network, established a treating scheme of capacitance current according to evaluating results, namely automatic tracking compensation arc suppression coil devices. The running results show that the scheme limits the size of the ground current and decreases rate of accidents of arc grounding over-voltage, which is good for improving the power supply safety.

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