CRMagnetics Catalog

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128
G
PT3-1-45 and PT3-2-45
•
•
•
FUSE FOR MODEL
PT3
TRANSFORMER
RATING
VOLTS
INTERRUPTING
AMPERES (SYM)
SUGGESTED
RATING
CONTINUOUS
AMPERES
CAP DIA .
INCHES
(a)
LENGTH
INCHES
CLIP CENTERS
INCHES
2400:120V 5.5kV 45,000 2.0E 1.0 5.63 5.00
3300:110V 5.5kV 45,000 2.0E 1.0 5.63 5.00
4200:120V 5.5kV 45,000 1.0E 1.0 5.63 5.00
4800:120V 5.5kV 45,000 1.0E 1.0 5.63 5.00
(a)
(b)
(c) Values in table are in iohms.
(d) Fuse clips noted as "CC or "C" accept fuses with 1.0" Dia. caps and 5" centers. Fuses clips with a suffix "CCS" or "CS" accept fuses with 0.81 in. caps and 5 in.
clip centers
RECOMMENDED MINIMUMSPACINGS
A= Unit to Unit = 0.75” m inim um .
B= HV to Ground in air = 3.00” m inim um .
User needs to set appropriate values to assure
perform ance for high potential test, im pulse test,
high hum idity, partial discharge, high altitude, and
other considerations like configuration.
UNFUSED ONE FUSE TWO FUSE
CIRCLE DIAGRAM
Two fuse transformers should not be used for Y connections. It is preferred practice to connect one lead from each voltage transformer directly to the neutral terminal,
using a fuse int he line side of the primary only. By using this connection a transformer can never be made "live"from the side by reason of a blown fuse in the neutral
side. For continuous operation the transformer primary voltage should not exceed 110% of rated value.
Voltage transformers connected line-to-ground cannot be considered to be grounding transformers and must not be operated with the secondaries in closed delta
because excessive currents may flow in the delta.
Note: It is recommended that system line-to-line voltage not exceed the transformer maximum system voltage level.
Primary terminals that are unfused are 1/4-20 brass screws with one flatwasher
and lockwasher.
Primary terminals that are fused are 1/4-20 brass screws with one flatwasher
and lockwasher and two nuts.
Secondary terminals are No. 10-32 brass screws with one flatwasher and
lockwasher.
Recommended spacing are for guidance only
The circle diagram can be used to predict the performance of a transformer
for various loads and power factors. A convenient scale of volt-ampere is
shown on the unity power line (u.p.f.) and commences at the zero or
no-load locus. To use the diagram, measure the known V.A. and scribe an arc
about the "Zero" locus of a length that contains the angle of the burden
power factor. The point at which the arc terminates is the error locus in phase
angle minutes and ratio correction factor.
Potential Transformers
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
Web: E-mail:
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Energy Monitoring
Company
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