Thanks Scotty, for the publication you mentioned.
I'm still hoping that some of the forum members are able to furnish me with some data on the history of direct water-cooling, especially because this technology had its origin in Great Britain.
In 1914 the British Parson's Company applied for a patent of water-cooled turbogenerator rotors and one year later a water-cooled rotor was built and tested by GE in America. The field winding was indirectly water-cooled with the cooling water circulating through axial holes positioned below the...
I could never understand why the IEC is unable to standardize electric symbols. Even worse is the fact that in a library you have to bend your neck left and right to recognise book titles.
Wolf
nelvex:
The application of a certain vacuum is the answer to brake dust and oil vapour problems:
1. Encase every single brake pad and connect the resulting chambers to a suitable vacuum cleaner. In order to reduce brake dust, adjust braking speed to 20% or even lower.
2. Apply a modest under...
Lets assume your synchronous motor is connected to the grid, is running at rated voltage and is delivering rated active power. Lets also assume that the excitation system is adjusted in such a way that zero reactive power is generated, i.e. the motor is running at 1.0 p.f. If you then increase...
Hi Pete:
Why didn't you ask the manager what a CNDF is?
Is this thread (and the other one depicting the cross section of a 1000MW+ 25kV Roebel bar) having a professional background?
Wolf
NicNac:
I have to make one important clarification:
A third harmonic in a generator sine wave will NOT be present if the stator winding is of the WYE connection type. A delta connected stator winding will have a substantial third harmonic. Such a winding configuration therefore must be...
NicNac:
A synchronous generator excited to rated voltage - but not connected to the grid - does generate a sine wave with a certain amount of harmonics. However, the third harmonic will NOT be present if the stator winding is symmetrical phase-wise, i.e. if the number of turns per phase is...
rasevskii:
English Electric built generators mainly at their Stafford plant (formerly Siemens. Bros.) until 1968. Then EE merged with GEC (General Electric Company). To my knowledge English Electric never built hydro generators in the 100 MW class, not even close to it.
Send me an e-mail for...
low1:
Bill is exactly right with his comments dated 12Dec11 21:47. If the excitation current remains constant (in case the AVR got stuck) during MW load changes such VAR variations are inevitable. However, don't forget the field time constant. For large hydro generators such a time constant can...
uhpo:
The purpose of tolerance figures is to protect a contract partner from unjust liability cases. I remember that for subtransient reactance guarantee figures a tolerance of 30% was specified some time ago as the calculation methods those days were not very reliable. Regarding the adjustment...
