Application and choosing of inverter in the aluminium industry
0
Citation
0
Reference
12
Related Paper
Abstract:
The application of the inverter is wider and wider in the aluminium industry,and it is important to choose the inverter,to maintain the inverter,and to diagnose the fault of the inverter.According to the characteristic of loads in the aluminium industry,this paper introduces the method of choosing the inverter,and gives the maintenance and diagnosing ways to the inverter.Keywords:
Grid-tie inverter
Cite
Introduce when designing high-frequency transformer the issues which must take into consideration. Meanwhile make use of area product method (AP), designed a high-frequency transformer which apply to inverter power supply, and conducted experiments
Energy efficient transformer
Delta-wye transformer
Cite
Citations (0)
The common fault of main equipment protection at home and aboard is pointed out and analyzed, and effective solving method is put forward at the same time. The protection engineers should understand the possible fault type, fault number, fault position and short-circuited coil number occurring in the winding of generator and transformer. The design of main protection configuration scheme for the large-sized generator and transformer must be based on the simulation of stator winding internal faults and the check of protection sensitivity. The final main protection scheme is optimized according to the design principle of advantage complementation and comprehensive utilization. Quantitative and scientific design achievement can be acquired by using above design method and it is beneficial to the safe operation of the large sized generator and transformer. The zero-sequence differential protection ought to be added at the star winding of extra-high voltage transformer. The impedance protection isn't suitable to be used as short-range backup protection for the large-sized generator and transformer.
Delta-wye transformer
Differential protection
Cite
Citations (0)
Illustrates the technical diagnosing process of the power transformer faults through the example, analyzes and tests the reasons of the fault, finally draws the conclusion.
Cite
Citations (0)
Electrical and magnetic domain parameters for online condition monitoring of converter transformers used in marine power system is explored, where the traditional DGA and PD techniques are not much applicable. Current signal and leakage flux from transformer core and winding are studied, with an emulated inter-turn fault in a 10 kVA lab-scale converter transformer. It is expected that the presence of valve winding in converter transformer will pose a challenge, for condition monitoring as it has inherent harmonics. There is a need for an online monitoring technique which is simple, cost effective and rugged to diagnose the fault and raise an alarm on-board ship, as it may lack the right maintenance technician or a replacement transformer during the voyage. Method of emulating the inter-turn fault in transformer, experimental studies and the frequency domain results from electrical and magnetic sensors for condition monitoring are discussed.
Condition Monitoring
Energy efficient transformer
Cite
Citations (3)
The paper makes analysis for a 750kV transformer fault during putting into operation and in service,and proposes the problems that should be regarded of high voltage degree transformer in process of design,manufacture and operation.
Cite
Citations (0)
The construction of transformers for high voltage direct current (HVDC) converter application poses new challenges to the manufacturer in terms of tight control of impedance, combined ac and dc dielectric stresses in the insulation, and non-sinusoidal load current duty. General Electric research has developed many analytical tools to accurately predict operational performance, evaluate material characteristics under dc stress, and test numerous prototype structures. It has also generated special manufacturing methods and processes to ensure successful assembly and test. The company has produced converter transformers and smoothing reactors to about 500kV dc, and will be prepared to build higher voltage units when the industry requires them. 1 reference, 9 figures.
Cite
Citations (2)
The common fault reasons of on-load tap-changer in transformer are analyzed.The measures to solve problems and the maintenance are presented.
Tap changer
Cite
Citations (0)
Recently, with the EHV large capacity transformers putting into operation continuously, reliability, rapidity and sensibility are in highly demand. It is imperative to consummate transformer differential protection and bring forward novel transformer main protection. Novel principles and algorithms are analyzed to solve some key problems still existing in power transformer main protection. Simulation and dynamic testing results verify this scheme is independent of core characteristics and transformer parameters and is suitable for the Y/△ connected transformers. By comparing with the transformer differential protection, technical routes of power transformer main protection is proposed. This project is supported by National Natural Science Foundation of China(No.50777016).
Differential protection
Energy efficient transformer
Cite
Citations (0)
According to several fault types of potential transformer in daily work,combined with some typical fault cases occurred in real work,the paper makes an in-depth analysis on its behavioral process and consequences.Based on which,the paper proposes some suggestions on how to operate and monitoring in-use potential transformer,which help improve the operation management level and fault handling skills of the potential transformers.
Cite
Citations (0)
The influence of the periodicity of diagnostic measurements on the operational state of high-voltage transformers is considered. Examples of defects of switching devices of converter transformers and methods for their detection are given. The rationale for the importance of recognition of defects at an early stage of their occurrence is given. The influence of the multiplicity of overvoltages on the service life of converter transformers in the aluminum industry is investigated. Based on the analysis of the service life of converter transformers of one of the powerful aluminum plants, where 83% of converter transformers have exhausted their standard service life, it is shown that in 40% of cases it would be possible to avoid their failures, with timely detection and elimination of emerging defects. Examples of defects of OLR (on-load regulators) of converter transformers and methods for their detection are given. The importance of recognition of defects at an early stage of their occurrence is substantiated. A method for chromatographic analysis of dissolved gases in transformer oil has been developed for the qualitative determination of defects and ways to eliminate them. Examples of diagnostics of converter transformers at operating voltage and working load are given, providing the best quality operational characteristics of converter transformers. The periodicity of diagnostic measurements and the reduction of defects and failures has been substantiated. The question of diagnosing the state of the converter transformer TDNP-40000/10 at an enterprise of the aluminum industry is investigated. Currently, diagnostic methods are being developed based on chromatographic analysis of dissolved gases in transformer oil. The presented method of evaluating the operating parameters of transformers allows for the safe operation of high-voltage transformers and enables to increase the reliability of the power supply scheme of aluminum industry plants.
Service life
Cite
Citations (0)