Fast transient radiated and conducted electromagnetic interference measurement within power system substations

1999 ◽  
Author(s):  
C.S. Barrack
Keyword(s):  
Power System ◽  
Electromagnetic Interference ◽  
Interference Measurement ◽  
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.

Research on Anti-Interference of Measurement-Control Device in Substation Automation System

2013 ◽  
Vol 853 ◽  
pp. 302-305
Author(s):  
Qiang Gao ◽  
Jing Jing Du ◽  
Quan Yang Li
Keyword(s):  
Power System ◽  
Work Environment ◽  
Electromagnetic Interference ◽  
Electromagnetic Compatibility ◽  
Control Device ◽  
Automation System ◽  
Electromagnetic Environment ◽  
Measurement Control ◽  
Control Devices ◽  
Substation Automation

With the wide adoption of relay protection, power grid control and communication equipments in power system based on micro-circuit and micro-processor, the electromagnetic compatibility (EMC) of measurement-control devices has become an urgent and necessary consideration in substation automation system. In this paper, the electromagnetic environment and electromagnetic interference (EMI) problem in substation is presented, and several typical anti-interference methods regarding measurement-control devices are explored based on the analysis of unique characteristics and work environment of this kind of devices. Furthermore, anti-interference application in actual substation site is demonstrated, with the example of CSI-200 series devices.

scholarly journals Theoretical Modeling and Implementation of Traveling Wave Sensor Based on PCB Coils

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Zewen Li ◽  
Tuofu Deng ◽  
Xiangjun Zeng ◽  
Feng Deng ◽  
Lei Shu
Keyword(s):  
Traveling Wave ◽  
Electromagnetic Interference ◽  
Fault Location ◽  
Simple Structure ◽  
Physical Structure ◽  
Mutual Inductance ◽  
Rogowski Coil ◽  
Wave Signal ◽  
Interference Measurement ◽  
New Type

Based on analyzing characteristics of Rogowski coil, a new type of PCB traveling wave sensor with simple structure, high linearity, and anti-interference ability is proposed. The sensor has fine physical structure, which can effectively resist external electromagnetic interference by anti-interference measurement. In addition, it can greatly improve mutual inductance based on simple combinations. Simulations show that the new PCB traveling wave sensor can validly extract and deliver traveling wave signal and therefore realize fault location and protection accurately.

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