Mea­sure­ments on tur­bines

Prob­lems: Mechan­i­cal dam­age of the tur­bine, shaft break­age of the tur­bine.

Goal: Sup­port for opti­mal design of tur­bines, pre­ven­tion of super­po­si­tion of tor­sion­al oscil­la­tions due to fre­quen­cy fluc­tu­a­tions of the grid.

Tur­bines for pow­er gen­er­a­tion can be gas or steam tur­bines. The increas­ing devel­op­ment of tur­bines goes in the direc­tion of larg­er and more effi­cient rotat­ing machines. Due to the enor­mous mass and speed of rota­tion dur­ing oper­a­tion, tur­bines pos­sess enor­mous ener­gy. Crit­i­cal tor­sion­al vibra­tions can occur both dur­ing planned run-up and run-down of tur­bines for main­te­nance (“out­age sea­son”) and dur­ing con­tin­u­ous oper­a­tion. They lead to mechan­i­cal dam­age or even shaft break­age and should there­fore be avoid­ed as a mat­ter of urgency. Espe­cial­ly grid fre­quen­cy fluc­tu­a­tions can pro­mote tor­sion­al vibra­tions at the tur­bine dur­ing con­tin­u­ous oper­a­tion. A tor­sion­al vibra­tion analy­sis makes it pos­si­ble to avoid crit­i­cal oper­at­ing points and to ensure safe­ty. The aim here is to pre­vent tor­sion­al vibra­tion from being super­im­posed by fre­quen­cy fluc­tu­a­tions in the grid, feed­back effects and the nat­ur­al fre­quen­cy of the sys­tem.

Speed mea­sure­ment on tur­bines is usu­al­ly car­ried out with mag­ne­to-resis­tive sen­sors on gear wheels. Here, one mea­sures quan­ti­ties such as sin­gle-chan­nel mea­sured quan­ti­ties such as the oscil­la­tion angle and uses the char­ac­ter­is­tic of the angu­lar veloc­i­ty. Fur­ther­more, it is pos­si­ble to mea­sure the tor­sion angle between the begin­ning and the end of the rotor dur­ing oper­a­tion in order to be able to observe the dynam­ic tor­sion. Mea­sure­ments over a longer peri­od of time allow knowl­edge to be gained about the endurance run­ning capa­bil­i­ty under dif­fer­ent load con­di­tions. These result from loads from the ener­gy grid.

The record­ed mea­sured val­ues are eval­u­at­ed in the spec­tral range.

Fur­ther­more ROTEC ENGI­NEER­ING pro­vides you with sup­port and tech­ni­cal engi­neer­ing know-how for prob­lems relat­ed to vibra­tion analy­sis of engines, trans­mis­sions and dri­ve trains. With our know-how, we make a valu­able con­tri­bu­tion to your prod­uct in the areas of tim­ing gear val­i­da­tion, valve train opti­miza­tion, clutch design, trans­mis­sion errors (TE), trans­mis­sion opti­miza­tion, oil sup­ply opti­miza­tion, pow­er­train mea­sure­ment and opti­miza­tion, cur­rent and volt­age analy­sis, and the appli­ca­tion of mea­sure­ment tech­nol­o­gy.