SAFETY

As with all electrical equipment, appropriate safety measures must be

taken when dealing with excitation equipment. High voltage is present

within the excitation cubicles; their magnitudes depend upon the

particular system. Opening the sources (e.g., disconnecting device 41)

does not completely disconnect the high voltages.

As long as the machine is still physically connected to the system, there

is a possibility that a safety hazard exists.

Every precaution must be taken when working at the excitation control

switchgear to ensure that all high voltages are isolated and avoided by

test personnel. In addition to the machine terminal voltage (460 Vac or

greater) at the excitation transformer, there may be other sources of

power entering the cubicles, such as 125/250 Vdc and/or 120/240 Vac

used to feed certain devices. A good rule to follow is to assume that all

connections are live and dangerous until proven otherwise and to avoid

all body contact with any of these voltages.