IEEE Power & Energy Magazine - January/February 2018 - 59
voltage output of the generator to hold
the current constant. as lights are added or removed from the circuit due to
maintenance or failure, the resistance
of the circuit changes; more lights
give more resistance, and fewer lights
give less. If the generator voltage was
great effect on the quality of the light.
For the series-arc light system, a device
known as a voltage regulator controls
the current flowing through the lamp.
this device is normally located near the
generator in the powerhouse. It senses
the current in the line and changes the
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figure 4. An arc lamp with an inner
globe. (From Electric Lighting and Railways. Scranton, PA: ICS, 1901.)
If a street lamp is required to burn all
night, it is very frequently fitted with two
sets of electrodes. one electrode burns
down, and when it is close to being depleted, the second electrode automatically takes over.
as a later modification, a tight-fitting inner globe was added to reduce
electrode consumption and the frequency of globe cleaning. an arc lamp
with an inner globe is shown in Figure 4. the cylindrical "can" structure
above the outer globe contains the arcgap regulating mechanism that will be
described shortly.
General minor maintenance of the
arc lamps was known as trimming, no
doubt a throwback to the tending of the
wicks of oil lamps. arc lamp trimming
involved cleaning the globes and replacing the carbon electrodes. the upper carbons burn down at a higher rate than the
lower ones. Cleaning the electrodes was
also necessary to ensure that the control
system could feed them properly into the
arc as the gap lengthened.
It is important that the current
through and the voltage across the arc
remain more or less constant. a change
in either of these quantities can have a
january/february 2018
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ieee power & energy magazine
59
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Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - January/February 2018
Contents
IEEE Power & Energy Magazine - January/February 2018 - Intro
IEEE Power & Energy Magazine - January/February 2018 - Cover1
IEEE Power & Energy Magazine - January/February 2018 - Cover2
IEEE Power & Energy Magazine - January/February 2018 - Contents
IEEE Power & Energy Magazine - January/February 2018 - 2
IEEE Power & Energy Magazine - January/February 2018 - 3
IEEE Power & Energy Magazine - January/February 2018 - 4
IEEE Power & Energy Magazine - January/February 2018 - 5
IEEE Power & Energy Magazine - January/February 2018 - 6
IEEE Power & Energy Magazine - January/February 2018 - 7
IEEE Power & Energy Magazine - January/February 2018 - 8
IEEE Power & Energy Magazine - January/February 2018 - 9
IEEE Power & Energy Magazine - January/February 2018 - 10
IEEE Power & Energy Magazine - January/February 2018 - 11
IEEE Power & Energy Magazine - January/February 2018 - 12
IEEE Power & Energy Magazine - January/February 2018 - 13
IEEE Power & Energy Magazine - January/February 2018 - 14
IEEE Power & Energy Magazine - January/February 2018 - 15
IEEE Power & Energy Magazine - January/February 2018 - 16
IEEE Power & Energy Magazine - January/February 2018 - 17
IEEE Power & Energy Magazine - January/February 2018 - 18
IEEE Power & Energy Magazine - January/February 2018 - 19
IEEE Power & Energy Magazine - January/February 2018 - 20
IEEE Power & Energy Magazine - January/February 2018 - 21
IEEE Power & Energy Magazine - January/February 2018 - 22
IEEE Power & Energy Magazine - January/February 2018 - 23
IEEE Power & Energy Magazine - January/February 2018 - 24
IEEE Power & Energy Magazine - January/February 2018 - 25
IEEE Power & Energy Magazine - January/February 2018 - 26
IEEE Power & Energy Magazine - January/February 2018 - 27
IEEE Power & Energy Magazine - January/February 2018 - 28
IEEE Power & Energy Magazine - January/February 2018 - 29
IEEE Power & Energy Magazine - January/February 2018 - 30
IEEE Power & Energy Magazine - January/February 2018 - 31
IEEE Power & Energy Magazine - January/February 2018 - 32
IEEE Power & Energy Magazine - January/February 2018 - 33
IEEE Power & Energy Magazine - January/February 2018 - 34
IEEE Power & Energy Magazine - January/February 2018 - 35
IEEE Power & Energy Magazine - January/February 2018 - 36
IEEE Power & Energy Magazine - January/February 2018 - 37
IEEE Power & Energy Magazine - January/February 2018 - 38
IEEE Power & Energy Magazine - January/February 2018 - 39
IEEE Power & Energy Magazine - January/February 2018 - 40
IEEE Power & Energy Magazine - January/February 2018 - 41
IEEE Power & Energy Magazine - January/February 2018 - 42
IEEE Power & Energy Magazine - January/February 2018 - 43
IEEE Power & Energy Magazine - January/February 2018 - 44
IEEE Power & Energy Magazine - January/February 2018 - 45
IEEE Power & Energy Magazine - January/February 2018 - 46
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IEEE Power & Energy Magazine - January/February 2018 - 49
IEEE Power & Energy Magazine - January/February 2018 - 50
IEEE Power & Energy Magazine - January/February 2018 - 51
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IEEE Power & Energy Magazine - January/February 2018 - 53
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IEEE Power & Energy Magazine - January/February 2018 - 55
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IEEE Power & Energy Magazine - January/February 2018 - 58
IEEE Power & Energy Magazine - January/February 2018 - 59
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IEEE Power & Energy Magazine - January/February 2018 - 62
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IEEE Power & Energy Magazine - January/February 2018 - 75
IEEE Power & Energy Magazine - January/February 2018 - 76
IEEE Power & Energy Magazine - January/February 2018 - Cover3
IEEE Power & Energy Magazine - January/February 2018 - Cover4
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