Condition Monitoring of Rotating Electrical Machines by Peter John Tavner, Li Ran, Jim Penman, Howard Sedding

By Peter John Tavner, Li Ran, Jim Penman, Howard Sedding

The 1st variation of this ebook, written by way of Tavner and Penman, was once released in 1987. The economics of have now replaced as a result privatization and deregulation of the strength undefined, putting way more emphasis at the value of the trustworthy operation of a plant in the course of the complete life-cycle, despite first charges. As engineering procedures are computerized and manpower is decreased, situation tracking of engineering crops has elevated in significance. the supply of complicated electronics and software program in robust instrumentation, pcs and electronic sign Processors (DSP) has simplified our skill to software and learn equipment. for this reason, tracking is now being utilized to a much wider variety of structures, from fault-tolerant drives of some hundred Watts within the aerospace undefined, to equipment of some hundred Megawatts in significant capital crops.

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The widespread application of on-line partial discharge monitoring equipment as well as advances in the interpretation of the data produced by these tools. Use of partial discharge monitoring equipment has enabled machine users to better determine the condition of stator winding insulation in operating machines and to take corrective action at early stages. Although there is little maintenance available to remediate the presence of voids in the groundwall insulation, actions such as maintaining the integrity of the slot support system or reducing the operating stresses on the machine may arrest the process.

Consequently, significant effort is expended by machine manufacturers and users to maintain the integrity of the slot support system; that is, the 42 Condition monitoring of rotating electrical machines tightness of the stator wedges that restrain the winding in the slot. During the transition from thermoplastic to thermoset insulation systems, a significant increase in slot discharge problems on large air-cooled machines was observed by Lyles et al. [11,12]. 6, were described by Evans [13]. In these cases, the new hard insulation systems did not conform well to the stator slot unlike the older thermoplastic insulations.

The cooling gas may also become damp because of ambient conditions, for instance in a tropical country, or due to cooler leakage. Either of these can lead to the condensation of moisture on the electrical insulation and connections giving a reduced insulation resistance. A machine needs to be designed to meet the environmental, mechanical and electrical disturbances it is likely to encounter during its life but any monitoring scheme that is installed should be directed towards detecting the untoward effects of these disturbances.

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