Here discussed some Questions about electric braking in large hydrogenerators, such as guide vans leakage, the main field circuit and the generator short circuit switch during the period of generator shutdown, prototype test of several electric and mechanical braking is given.
In the LD drive module,a new wavelength-locking technique is used to realize the high precision control of the wavelength. And slow turning on,limiter circuit and short circuit switch,which are the LD surging protection measures,are also used.
The cascade speed-regulating system composed of normal three-phase full-controlled bridge inverse transformer and rotor-side short-circuit switch is introduced. With change of rotor-side short-circuit time the operation under high power factor can be realized.
A basic principle of spiral strip line generator (SSLG) for obtaining millimicrose-cond pulsed high voltage is described. Design method of SSLG with a short switch is given. The SSLG's inner end is the high -voltage output end, and its outer end is grounded.
The battery was forcibly discharged at a constant resistance much smaller than its internal resistance by a newly constructed short circuit switch.
Initial short circuit currents have been observed using our electronic short circuit switch and also predicted from terminal voltage and ohmic resistance according to Ohm's law for several kinds of lead-acid batteries in various states-of-charge.