S-Link - CPS's dual element constructed fuse
link with very slow time-current characteristics.
Sealed Transformer - Completely sealed from
outside atmosphere and usually contains an inert gas which is
slightly pressurized.
Secondary Taps - Taps located in the secondary
winding (refer to Taps).
Secondary Voltage Rating - Designates the load
circuit voltage for which the secondary winding (winding on the
output side) is designed.
Secondary Winding - The transformer winding
connected to the load or output side.
Series Gap - Internal gap(s) between spaced
electrodes in series with the valve elements across which all or
part of the impressed arrester terminal voltage appears.
Series/Multiple - A winding of two similar
coils that can be connected for series operation or multiple
(parallel) operation.
Sine Wave - The waveform produced by rotating
a loop of wire at uniform speed in a magnetic field and measuring
the voltage that is induced, along with the angular displacement
of the wire.
Slow speed Ratio - A speed ratio of melting
characteristics from 10-13 (see Speed Ratio).
Sparkover - A disruptive discharge between
electrodes of a gapped protective device.
Specialty Arrester - An arrester designed
specifically for a particular application to meet the specified
needs of that application. Riser pole and under-oil are specialty
arrester.
Speed Ratio - A ratio given for the time
current characteristics of fuse links; the ratio of the 0.1
second minimum melting current to the 300 or 600 second melting
current (300 seconds for fuse links rated 100A and less, 600
seconds for 140 and 200 A ratings).
Station Class Arrester - A classification of
3-684 kV rated arresters which typically have had the greatest
degree of protection (prior to VariGAP), the highest level of
energy handling and durability and pressure relief capability up
to 80 kA and above on some ratings.
Steady State - A condition in which circuit s
values remain essentially constant, occurring after all initial
transients or fluctuating conditions have settled down.
Storm Trapper®
- CPS's low voltage arrester with a 1500 A duty cycle rating and
10 kA high current short duration rating.
Storm Trapper H.E. - CPS's low voltage
arrester with a 5000 A duty cycle rating and 40 kA high current
short duration, hence H.E. (high energy).
Stress, Voltage - A transient current of
voltage usually associated with lighting or switching.
System Capacity - Represents the ability of a
system to meet its customer's needs, or the electrical demand of
its customer. System capacity is provided by generators,
transmission lines, distribution networks and load management.
System Voltage - The rms power frequency
voltage from line-to-line as distinguished from the voltage from
line-to-neutral.
Surge - Transient current or voltage
associated with lightning or switching
Switchgear - A general term covering switching
and interrupting devices and their combination with associated
control, metering, protective and regulating devices; also
assemblies of these devices with associated interconnections,
accessories, enclosures and supporting structures, used primarily
in connection with the generation, transmission, distribution and
conversion of electric power.
Switchgear Assembly - An assembled piece of
switchgear equipment (indoor or outdoor) including but not
limited to one or more of the following: switching; interrupting;
control; metering; protective and regulating devices, together
with their supporting structures; enclosures; conductors;
electric interconnections and accessories.
Switch, Limit - A switch that is operated by
some part or motion of a power-driven machine or equipment to
alter the electric circuit associated with the machine or
equipment.
Symmetric - A term used to explain the normal,
rhythmic ac flow of current (transient or dc component = ); the
steady state component of any current or fault current
calculation.
Systems Capacity - Represents the ability of a
system to meet its customers' needs, or meet the electrical
demand of its customers. System capacity is provided by
generators, transmission lines, distribution networks and load
management.
Glossary Index