By Lou Drendel

B-52 Stratofortress stroll round

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With brushless machines the rectifier will be mounted on the generator shaft and will therefore be rotating. 8). 5 s for the size of generator usually met with being a shade slower that with the direct systems due to the inherent response time of the rotary exciter. C. EXCITER Figure 6. 7 Separate excitation Separate excitation. 7 the excitation a constant voltage (permanent magnet) pilot from an external source. The pilot exciter is by, the shaft of the main generator. C. ) exciters are similar to those used in indirect self-excitation systems.

C. GENERATORS 51 (i) Current compounding or short-circuit maintenance transformers and other components are unnecessary since an 'error-operated' system can be used which is guaranteed a constant supply voltage at all times. (ii) Voltage build-up difficulties which sometimes occur in separately excited generators are entirely avoided. (iii) There is less risk of radio interference, since the excitation thyristers are not connected to the generator output circuit. c. pilot exciter, though the system could be designed to work with any suitable electrical supply.

4, taken from actual tests, is typical. Makers will generally supply dash-pot oil suitable for their circuit breakers and relays. The recommended oils are usually selected on the basis of least variation in viscosity over the working range, coupled with viscosities which will give the time delay marked on the calibration plate. These special oils should therefore invariably be used. The time delays are usually calibrated at 15°C. unless otherwise stated by the maker and are only correct at this temperature.

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