Transformer Bushing Online Monitoring Method Based on the Method of Relative Angle Difference

2014 ◽  
Vol 668-669 ◽  
pp. 961-964
Author(s):  
Qiang Gao ◽  
Feng Yuan ◽  
Zhan Nan Guo ◽  
Qi Liu ◽  
Dan Tian Zhong ◽  
...  
Keyword(s):  
Power System ◽  
Power Supply ◽  
Online Monitoring ◽  
Relative Method ◽  
Safe Operation ◽  
Monitoring Method ◽  
Angle Difference ◽  
On Line ◽  
Security And Reliability ◽  
Data Acquiring

Transformer is the main equipment of power system, its operation reliability is directly related to power system security and reliability of power supply. In order to guarantee the safe operation of power system, must strengthen the monitoring of the main transformer.With the development and popularization of intelligent station, the detection of transformers insulation is faced with the new problem that PT signal is not convenient to get and even unable to get. This paper proposes the relative method which is used to calculate and monitor dielectric loss of transformer bushing and designs the on-line monitoring device, through the data acquiring form the on-line monitoring instrument which are installed in the transformer of substation shows that this method has high precision, strong anti-interference ability.

Research on Intelligent Online Monitoring and Evaluation of Power Transformer

2015 ◽  
Vol 9 (1) ◽  
pp. 483-489 ◽  
Author(s):  
Liu Tong
Keyword(s):  
Power System ◽  
Online Monitoring ◽  
Power Transformer ◽  
Full Range ◽  
Monitoring And Evaluation ◽  
Pressure Control ◽  
Safe Operation ◽  
Intelligent Monitoring ◽  
State Evaluation ◽  
On Line

Transformer is the power equipment of power system core. Intelligent monitoring and operation of transformer can not only monitor the full range of the transformer, the realization of state evaluation, it should be required repair, maintenance required good, but also on the latent fault early diagnosis and prediction. Research on transformer intelligent monitoring and operating technology of safe operation of power system and the substation has great significant and impoertance. According to the theory and method of transformer intelligent, combined with intelligent transformer on-line monitoring technology has been achieved, mainly explores the intelligent cooling and adjustable transformer pressure control technology.

New Methodology of On-Line Monitoring for Transmission Line Galloping

2013 ◽  
Vol 805-806 ◽  
pp. 867-870 ◽  
Author(s):  
Yu Sheng Quan ◽  
Enze Zhou ◽  
Guang Chen ◽  
Xin Zhao
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Large Scale ◽  
Online Monitoring ◽  
Large Area ◽  
Monitoring Method ◽  
Overhead Transmission Line ◽  
Additional Equipment ◽  
On Line ◽  
Wire Cross Section

When the overhead transmission line is galloping, a variety of natural disasters occur on the role of the natural conditions, the vibration of conductor is one of the more serious harm to the power system. Over the past decade, as the construction of EHV and UHV, wire cross-section, tension, suspension height and span of overhead transmission lines are increasing, and hence the number of conductor vibration is significantly increased. Vibration in a large scale will led to frequent tripping or even broken line or tower collapses, which cause large area power failures and impact security and stability operation. Online monitoring method for overhead transmission line dancing is mostly needed to add additional equipment, however, once situated on the route environment overlying ice or high winds and other inclement weather, online monitoring is difficult to achieve. This paper presents a method, which is made correlation analysis based on the voltage and current acquired from both ends of the transmission lines, online monitoring of line galloping can be achieved.

scholarly journals On-Line Monitoring of Blind Fastener Installation Process

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1157
Author(s):  
Javier Camacho ◽  
Fernando Veiga ◽  
Mari Luz Penalva ◽  
Alberto Diez-Olivan ◽  
Lutz Deitert ◽  
...  
Keyword(s):  
Monitoring System ◽  
Special Interest ◽  
Online Monitoring ◽  
New Method ◽  
Back Side ◽  
Monitoring Method ◽  
Use Of Resources ◽  
On Line ◽  
Sensor Signals ◽  
Evaluation Outcome

Blind fasteners are of special interest for aircraft construction since they allow working on joints where only one side is accessible, as is the case in many common aerospace box-type structures, such as stabilizers and flaps. This paper aims to deliver an online monitoring method for the detection of incorrect installed blind fasteners. In this type of fastener, the back side of the assembly is not accessible, so monitoring the process installation is suitable as a system to assess the formed head at the back side with no access. The solution proposed consists of an on-line monitoring system that is based on sensor signals acquired during the installation. The signals are conveniently analyzed in order to provide an evaluation outcome on how the fastener was installed. This new method will help production to decrease/eliminate time and cost-intensive inspections and fasteners over installation in structures. The decrease of the number of installed fasteners will also contribute to weight savings and will reduce the use of resources.

High Voltage Circuit Breaker on-Line Monitoring System

2014 ◽  
Vol 898 ◽  
pp. 668-671
Author(s):  
Chao Fu ◽  
Jing Hao
Keyword(s):  
Power System ◽  
Monitoring System ◽  
High Voltage ◽  
Data Transfer ◽  
Circuit Breaker ◽  
Safe Operation ◽  
Coil Current ◽  
The Core ◽  
High Voltage Circuit Breaker ◽  
On Line

The high voltage circuit breaker is an important power system equipment. The reliability of its running relationship with the safe operation of the entire power system. High voltage circuit breaker on-line monitoring system enables real-time monitoring of various parameters during the operation in which the circuit breaker, and the use of communication to achieve data transfer bus information. Through monitoring points, closing coil current signals to constitute the core of C8051F online monitoring unit via RS-485 serial bus will monitor information is uploaded to the master computer.

scholarly journals Study on overhead transmission line on-line monitoring technology

2016 ◽  
Vol 20 (suppl. 2) ◽  
pp. 383-391 ◽  
Author(s):  
Zhiwang Yang ◽  
Nikola Zivlak ◽  
Ming Xu ◽  
Marko Ljubicic
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Transmission Line ◽  
Monitoring System ◽  
Online Monitoring ◽  
Safe Operation ◽  
Operation System ◽  
Overhead Transmission Line ◽  
On Line ◽  
Artificial Neural Network Ann

paper introduces a new idea for overhead transmission line online monitoring. The basis of the paper has been developed upon years of research conducted by power engineers, and a new advanced transmission line safe operation monitoring system is proposed successfully. Furthermore, we used artificial neural network(ANN) for diagnosis examples, to prove the feasibility and effectiveness of the advanced transmission line safe operation system.

scholarly journals 6.78-MHz, 50-W Wireless Power Supply Over a 60-cm Distance Using a GaN-Based Full-Bridge Inverter

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 371 ◽  
Author(s):  
Seung-Hwan Lee ◽  
Kyung-Pyo Yi ◽  
Myung-Yong Kim
Keyword(s):  
Power System ◽  
Monitoring System ◽  
Power Supply ◽  
Heat Dissipation ◽  
Optimization Technique ◽  
Operating Frequency ◽  
Wireless Power ◽  
Two Factors ◽  
On Line ◽  
Wireless Power Supply

An inductive wireless power transfer system is proposed as a power supply for an on-line monitoring system for an overhead catenary. Because of the high voltage (25 kVrms) applied to the catenary, galvanic isolation was required to supply power to the attached monitoring system. The proposed wireless power system was able to transmit 50 W over a distance of 60 cm at 6.78 MHz. Design methodologies for the transmitter and the receiver coils, 6.78-MHz GaN-based full-bridge inverter, and rectifier are proposed in this paper. Pareto optimality, a multi-objective optimization technique, was used to determine optimal solutions in terms of efficiency and copper usage. A 100-W, 6.78-MHz full-bridge inverter was developed using 100 V, 35 A, E-HEMT GaN MOSFETs. Because of the high operating frequency, two factors were considered in the design of the full-bridge inverter, (1) close placement of the gate driver and the switch to minimize parasitic inductance and the resulting fluctuation of the drive signal and (2) effective heat dissipation from the switches and gate drivers for a high power rating. In addition, a full-wave rectifier was built using Schottky barrier diodes with a reverse recovery time of a few tens of nano-seconds. The developed wireless power system was experimentally evaluated. The measured coil-to-coil efficiency was 77%, and the measured efficiencies of the inverter and the rectifier were 92% and 93%, respectively. The overall system efficiency was 57% for a transfer of 47 W. Finally, the dependences of the efficiency on the distance, operating frequency, and load were evaluated.

Aging Evaluation and Online Monitoring of Composite Insulators

2014 ◽  
Vol 521 ◽  
pp. 309-312
Author(s):  
Jun Wu ◽  
Zheng Zheng ◽  
Hong Bo Chen ◽  
Huan Bai ◽  
Dao Chun Huang ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Thermal Imaging ◽  
Online Monitoring ◽  
Visual Examination ◽  
Monitoring Method ◽  
Infrared Thermal Imaging ◽  
On Line ◽  
Sem Test ◽  
Scanning Electron

To evaluate the aging characteristics and study online monitoring method of composite insulators, four 220kV composite insulators of the same type were tested by visual examination, hydrophobicity tests, infrared thermal imaging tests and scanning electron microscope (SEM) tests. The results show that the infrared thermal imaging tests can effectively detect the broken insulators on-line and the SEM test is feasible to evaluate the aging degree of composite insulators.

Research on Online Monitoring for the Main Drive System of Rolling Mill

2011 ◽  
Vol 127 ◽  
pp. 444-448
Author(s):  
Yu Hou ◽  
Jian Yi Kong ◽  
Xing Dong Wang
Keyword(s):  
Monitoring System ◽  
Power Supply ◽  
Rolling Mill ◽  
Online Monitoring ◽  
Rolling Force ◽  
Drive System ◽  
Signal Acquisition ◽  
Monitoring Method ◽  
Communication Module ◽  
Main Drive System

An online monitoring method for the main drive system of rolling mill is studied in this paper. The monitoring objects are drive shaft torque, rolling force, and other related process signals of the rough rolling mill. A non-contact torque measurement method based on induction power supply was adopted, and this kind of power supply for sensors and transmitters can provide a long-term stable power supply, and make the system work continuously. The overall monitoring system includes signal acquisition module, network communication module, database server module, status monitoring and alarm module, signal processing and analysis module, and client server module. The realization of the monitoring system can help to prevent catastrophic damage and reduce additional costs due to unexpected downtime.

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