scholarly journals Improved Method to Obtain the Online Impulse Frequency Response Signature of a Power Transformer by Multi Scale Complex CWT

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 48934-48945 ◽  
Author(s):  
Zhongyong Zhao ◽  
Chao Tang ◽  
Chenguo Yao ◽  
Qu Zhou ◽  
Lingna Xu ◽  
...  
Keyword(s):  
Frequency Response ◽  
Power Transformer ◽  
Improved Method ◽  
Impulse Frequency ◽  
Multi Scale

Impact of capacitive coupling circuit on online impulse frequency response of a power transformer

2016 ◽  
Vol 23 (3) ◽  
pp. 1285-1293 ◽  
Author(s):  
Zhongyong Zhao ◽  
Chenguo Yao ◽  
Xiaozhen Zhao ◽  
Naser Hashemnia ◽  
Syed Islam
Keyword(s):  
Frequency Response ◽  
Power Transformer ◽  
Capacitive Coupling ◽  
Impulse Frequency ◽  
Coupling Circuit

Optical Frequency-Response Analysis for Power Transformer

2020 ◽  
pp. 1-1
Author(s):  
Guo-Ming Ma ◽  
Yunpeng Liu ◽  
Yabo Li ◽  
Xiaozhou Fan ◽  
Ce Xu ◽  
...  
Keyword(s):  
Frequency Response ◽  
Power Transformer ◽  
Response Analysis ◽  
Optical Frequency ◽  
Frequency Response Analysis

scholarly journals SFRA, Detect of Winding Deformation in Power Transformer

2020 ◽  
Vol 9 (5) ◽  
pp. 1392-1395
Keyword(s):  
Frequency Response ◽  
Power Transformer ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Sweep Frequency ◽  
Cause Analysis ◽  
Root Cause ◽  
Input And Output ◽  
Voltage Signal ◽  
Hidden Fault

The sweep frequency response analysis is extensively used technique for detect hidden fault and condition monitoring of power transformer. The operation is administered by supply a coffee voltage signal of varying frequencies to the transformer windings and measuring both the input and output signals. These two signals give the specified response of the ratio is named the transfer function of the transformer from which both the magnitude and phase are often obtained. Frequency response is change as measured by SFRA techniques may indicate a phase transition inside the transformer, then causes of fault identified and investigation is required for root cause analysis.

scholarly journals Frequency response analysis for exact power transformer impedance

2017 ◽  
Vol 2017 (1) ◽  
pp. 189-193 ◽  
Author(s):  
Masaya Hiraide ◽  
Takashi Nakajima ◽  
Tadashi Koshizuka ◽  
Hisatoshi Ikeda ◽  
Yasuhiko Taniguchi ◽  
...  
Keyword(s):  
Frequency Response ◽  
Power Transformer ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Exact Power

Impulse-Frequency Response and EIS Based NDE for Characterizing Bond Integrity of Adhesive Joints Subjected to Environmental Degradation

2005 ◽  
Author(s):  
Manoj Anakapalli ◽  
P. Raju Mantena ◽  
Ahmed Al-Ostaz ◽  
S. Jimmy Hwang
Keyword(s):  
Frequency Response ◽  
High Performance ◽  
Electrochemical Impedance ◽  
Lap Joint ◽  
Impulse Frequency ◽  
Pressure Sensitive Adhesives ◽  
Performance Pressure ◽  
Pressure Sensitive ◽  
Service Conditions ◽  
Non Destructive

Single-Lap Joint (SLJ) and three-point end-notched flexure (ENF) joint configurations were used to bond 1” × 1/8″ (25.4mm × 3.175mm) aluminum 2024 T-4 adherends using a range of 3M™ high performance pressure sensitive adhesives (Adhesives 69, 73 and 85) and VHB™ acrylic foam tapes (Foam 41, 50, 52). Batches of bonded specimens were subjected to two types of aggressive environments simulating extreme service conditions: freeze-thaw cycling from 10°F to 50°F at 6 cycles per day (ASTM C666 Procedure A) for 21 days with samples immersed in water; heat-cool cycling (with 90% of maximum recommended temperature by the manufacturer of both acrylic foam and adhesive transfer tapes attained at 70% relative humidity) and 3 cycles per day for 21 days. Electrochemical Impedance Spectroscopy (EIS) and Fast Fourier Transform (FFT) based impulse frequency response vibration Non-Destructive Evaluation (NDE) techniques were used to monitor overall bond integrity.

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