The measurement of fast transient electromagnetic interference within power system substations

1997 ◽  
Author(s):  
C.S. Barrack
Keyword(s):  
Power System ◽  
Electromagnetic Interference ◽  
Transient Electromagnetic ◽  
Fast Transient

scholarly journals Application of UHF Sensors in Power System Equipment for Partial Discharge Detection: A Review

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1029 ◽  
Author(s):  
Hua Chai ◽  
B.T. Phung ◽  
Steve Mitchell
Keyword(s):  
Power System ◽  
Electromagnetic Interference ◽  
Early Stage ◽  
Signal To Noise Ratio ◽  
Partial Discharge ◽  
Critical Role ◽  
Physical Structure ◽  
High Signal ◽  
Practical Applications ◽  
Electrical Stress

Condition monitoring of an operating apparatus is essential for lifespan assessment and maintenance planning in a power system. Electrical insulation is a critical aspect to be monitored, since it is susceptible to failure under high electrical stress. To avoid unexpected breakdowns, the level of partial discharge (PD) activity should be continuously monitored because PD occurrence can accelerate the aging process of insulation in high voltage equipment and result in catastrophic failure if the associated defects are not treated at an early stage. For on-site PD detection, the ultra-high frequency (UHF) method was employed in the field and showed its effectiveness as a detection technique. The main advantage of the UHF method is its immunity to external electromagnetic interference with a high signal-to-noise ratio, which is necessary for on-site monitoring. Considering the detection process, sensors play a critical role in capturing signals from PD sources and transmitting them onto the measurement system. In this paper, UHF sensors applied in PD detection were comprehensively reviewed. In particular, for power transformers, the effects of the physical structure on UHF signals and practical applications of UHF sensors including PD localization techniques were discussed. The aim of this review was to present state-of-the-art UHF sensors in PD detection and facilitate future improvements in the UHF method.

Study on Influence of Divided Conductor with Mechanical Properties on Operating over Voltage in Power System

2013 ◽  
Vol 454 ◽  
pp. 57-61
Author(s):  
Wei Kang ◽  
Li Xia Zhang ◽  
Yin Jing Du
Keyword(s):  
Magnetic Field ◽  
Power System ◽  
Power Line ◽  
Electric Arc ◽  
Protective Measures ◽  
Load Current ◽  
Current Pass ◽  
Complex Power ◽  
Fast Transient ◽  
The Magnetic Field

This paper analyzed the influence that divided conductor to electrical fast transient burst. Divided conductor may change the magnetic field distribution around the conductor, but accordingly increased conductors electrical susceptance. The mechanism that the disconnecting switch cut off the power line when the no-load current is at peak and electric arc distinguished when the current pass zero and accordingly restraining measure is proposed. The outcome showed that the model can simulate the electrical fast transient burst in capacitive power line and makes it easy to analysis complex power system problems based on simple model. The method is proved to be correct and enforceable by validation of protective measures.

scholarly journals Analysis of the Influence of the Breaking Radiation Magnetic Field of a 10 kV Intelligent Circuit Breaker on an Electronic Transformer

Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 7800
Author(s):  
Wenchao Lu ◽  
Jiandong Duan ◽  
Lin Cheng ◽  
Jiangping Lu ◽  
Xiaotong Du
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Interference ◽  
Arc Discharge ◽  
Test System ◽  
Interference Signal ◽  
Processing Unit ◽  
Simulation Test ◽  
Electronic Transformer ◽  
Transient Electromagnetic ◽  
Intelligent Distribution

The development of the smart grid requires the distribution switch to not be limited to the original breaking function. More functional requirements lead to more complex switch structures, especially the intelligent processing unit on the secondary side. A technology called primary and secondary integration optimizes the structure of the switch, which greatly increases the intelligence level of the switch, but also has disadvantages. The secondary intelligent unit is arranged close to the primary high-voltage electromagnetic environment, and the distribution switch is prone to failure due to electromagnetic interference. In order to explore the influence of electromagnetic interference on it, a transient electromagnetic interference simulation test platform was built for a 10 kV intelligent distribution switch based on the principle of spherical gap arc discharge, and the interference signal of the intelligent distribution switch was measured; the law of the spatial magnetic field near the electronic transformer is mainly studied in this paper. The shielding effectiveness of the distribution terminal of the switch was analyzed, and the interference of the power line of the sensor merging unit circuit board was calculated. The results show that the electronic transformer may have serious faults under continuous strong transient electromagnetic interference. The electromagnetic transient simulation test system studied in this paper can evaluate the anti strong electromagnetic interference ability of the electronic transformer.

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