Exciter power circuit
The exciter power circuit includes all
components not electrically isolated from the exciter output. For static
exciters, this includes the rectifier and thyristor circuits, transformer
windings, line filters, shaft current suppressors, and any auxiliary components
connected to either the input or output of the rectifier/thyristor bridge.
For rotating exciters, it includes armature
windings, commutators, and brushes. For rotating exciter rated outputs 350 V dc
or less, the ac rms test voltage shall be 10 times the rated output voltage of
the exciter, but with a minimum of 1500 V.
For static exciter rated outputs 350 V dc
or less, the ac rms test voltage shall be the greater of 10 times the rated
output voltage of the exciter, but with a minimum of 1500 V, or twice the rated
ac rms input voltage of the exciter plus 1000 V.
For rotating exciter rated outputs greater
than 350 V dc, the ac rms test voltage shall be 2800 V plus twice the rated
output voltage of the exciter. For static exciter rated outputs greater than
350 V dc, the ac rms test voltage shall be the greater of 2800 V plus twice the
rated output voltage of the exciter, or twice the rated ac rms input voltage of
the exciter plus 1000 V.
The synchronous-machine field winding is
not included as it is covered by ANSI C50.10-1990. The exciter rated output
voltage (for determination of the test voltage) shall not be less than the
voltage
required at the associated generator field
terminals when the generator is operated at rated kilovolt amperes, rated power
factor, and rated voltage with the generator field winding at
- 75°C for field windings designed to
operate at rating with a temperature rise of 60°C or less, or
- 100°C for field windings designed to
operate at rating with a temperature rise greater than 60° C.
The exciter rated input voltage shall not
be less than the voltage at the exciter input terminals when the generator is
operated at rated kilovolt-amperes, rated power factor, and rated voltage with
the generator field winding at
- 75°C for field windings designed to
operate at rating with a temperature rise of 60°C or less, or
- 100° C for field windings designed to
operate at rating with a temperature rise greater than 60° C.
All other circuits (electrically
isolated from the exciter power circuit)
For circuits rated above 60 V or above 60
VA and not greater than 600 V, the ac rms test voltage shall be 1000 V plus
twice the rated voltage. For circuits rated above 600 V, the ac rms test
voltage shall be 2000 V plus 2.25 times the rated voltage.
Circuits rated at 60 V or less and 60 VA or
less need not be given a high-potential test.
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