Models
CTI - CT3
Automatic
Comparators for Instrument Transformers
CTI:
Current Transformers Comparator
CT3:
Voltage Transformers Comparator
Applications
- Ratio error
and phase angle measurement on current
and voltage instrument transformers
- Measurements
can be performed at the laboratory or in
the field
Common
characteristics of both models:
- Based on
inductive dividers with very long term
stability
- The
measurement process is step by step
guided by the software Windows(r) based
- All the
measurements are done fully automatic
- The software
can compensate the error of the reference
standard transformer used
- The Test
Report can be recorded and printed
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- Both
Comparators CTI and CT3 can be operated
without the PC and software, using an
external oscilloscope
- CTI and CT3
can be supplied in a single cabinet or as
separate units
Characteristics of
Model CTI:
- Only a
Standard Transformer with secondary
nominal current of 5A is needed to
calibrate transformers with 1 A or 5 A of
secondary current
- Tests can be
performed according to IEC, VDE or IEEE-ANSI
Standards
- A digital
ammeter is included
Characteristics of Model
CT3:
- Transformers
with different voltage ratios can be
easily compared
- A digital
kilovoltmeter is included for primary
voltage reading
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Description
These new models of
current and voltage transformers comparators replace the
old manually balanced bridges that CONIMED manufactured
for more than 20 years. The hardware and software are
designed to perform measurements in a very simple way,
avoiding operator mistakes. The test reports can be
obtained immediately after measuring, and easily recorded
and printed.
The software goes step by
step through the whole measurement process, stating the
selected burden, current or voltage adjusting, and the
ratio and phase errors are calculated. The WindowsTM
based software makes everything easier.
If desired, the CTI and CT3 can be used with an
oscilloscope instead of the PC and software.
Specifications - CTI
Current range: 50 mA - 10
A , (depending on the secondary nominal current and
accuracy class of the sample transformer)
Error measurement range:
Accuracy Class 0.2 S (or 0.1) up to 1 - ( IEC )
Accuracy Class 0.3 to 1.2 - ( ANSI)
Error measurements do not
depend of frequency
Accuracy and resolution of error measurements in
automatic mode:
Resolution: ± 0,01 % - ± 0,01 cr ( ± 0,3 min)
Accuracy: ± 0,02 % - ± 0,03 cr ( ± 1 min)
Standard transformer,
nominal secondary current: 5 A
Sample transformer, nominal secondary current: 1 A or 5 A
Measurement of test current up to 199,9 % with 0,1 %
resolution
Specifications - CT3
Ratio of the sample
transformer voltage ratio
to the standard transformer voltage ratio: 0,5 < kx / kn < 4,4
Frequency range: 50 - 60
Hz
Accuracy and resolution of error measurements in
automatic mode:
Resolution: ± 0,01 % - ± 0,01 cr ( ± 0,3 min)
Accuracy: ± 0,02 % - ± 0,03 cr ( ± 1 min)
Measurement of test voltage: up to 300 V of secondary
voltage (transformer under test)
Accessories:
- Standard Current and
Voltage Transformers
- Burdens
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