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SPECIFICATION FOR
TYPE KATC–V
VOLTAGE TRANSFORMER COMPARATOR
1.
2.
3.
General
a.
This specification describes an instrument used to measure ratio and phase angle
errors of instrument transformers.
b.
The instrument shall use an external precision transformer (not included as part of
the comparator) as a reference and shall compare the transformer-under-test errors to
this reference.
Operation
a.
The instrument shall be automatic and autoranging. That is, no manual nulling shall
be required and selection of the optimum measurement range shall be automatic.
b.
The instrument shall be dedicated solely to the testing of voltage transformers.
Display
a.
The instrument shall digitally display the following:




b.
4.
The display shall be of the vacuum-fluorescent type with 1 line of 32 characters.
Protective Circuitry
a.
5.
Test voltage,
Ratio error (in percent or ratio correction factor (RCF)),
Phase error (in minutes or milliradians), and
ANSI accuracy class for which the transformer-under-test qualifies.
The comparator shall include circuitry to protect the instrument against damage that
may result from improper connection of the transformer-under-test (wrong polarity)
or by application of excessive test voltage. The operator shall be alerted to such
errors by an audible alarm and informed as to the specific nature of the error by a
message on the alphanumeric display.
Ranges
a.
Test Voltage Range:
40 to 160 volts in the secondary of the transformerunder-test
b.
Ratio Error Range:
–100% to +1000% (0 to 10 RCF)
c.
Phase Error Range:
–1000 to +1000 minutes
KATC-V Specification
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04-91
d.
6.
9.
The resolution of the comparator shall be based on the Accuracy Class and is
defined as follows:
Phase
Angle
Accuracy
RCF
(Minutes) Class (%)
0.0%
0.00001
0.01
0.01
 Accuracy Class < 0.2%
0.2%
0.00001
0.1
0.01
 Accuracy Class < 0.7%
0.7%
0.0001
0.1
0.01
 Accuracy Class < 1.4%
1.4%
0.0001
1.0
0.01
 Accuracy Class < 10.0%
10.0%
0.0001
1.0
0.1
 Accuracy Class <
Burden
a.
The comparator shall impose less than 0.2 VA burden on the standard transformer at
120 volts.
b.
The comparator shall impose less than 0.05 VA burden on the transformer-undertest, if the transformer-under-test is within the 0.6 accuracy class.
Input Power
a.
10.
The accuracy of the comparator shall be ±(0.75% of reading + 1 Least Significant
Digit).
Resolution
a.
8.
0 to 100
Accuracy
a.
7.
Accuracy Class Range:
The comparator shall operate from 120 VAC, 50/60 Hz., and shall require less than
0.2 amperes.
Options
a.
The comparator shall offer a 50/60 Hz. operation option.
b.
The comparator shall provide an optional parallel output for printing test results to a
printer.
c.
A printer shall be able to be purchased separately.
d.
The comparator shall provide an optional RS-232 port for sending test results to a
computer or RS-232 printer.
KATC-V Specification
Page 2 of 2
04-91