ISA T2000 - Page 20

DOC. SIE10110 Rev. 6 Page 21 of33
TEST
OF
TEST
DESCRIPTION
INPUT DATA
CONN. OUT
CONN. IN
MEASUREMENTS
CT
N. 1
Ratio Voltage mode
- I primary;
- I secondary
(nominal values)
- Voltage output
- Voltage input
High/Low V AC
to CT
secondary
CT primary
to low or high
Vin
1) High / Low VAC out;
2) Low V in;
3) Polarity;
4) Actual ratio;
5) Ratio error %;
and excitation curve, if
selected
CT
N. 2
Ratio, polarity and
burden
- I primary;
- I secondary
(nominal values);
- Clamp Y/N;
- Clamp ratio;
- Voltage input.
High I AC
to CT primary
CT secondary
to high I in;
(Low Iin with
Clamp);
CT secondary to
Vin low or high.
1) High I AC out (primary);
2) I in (secondary);
3) Nominal ratio;
4) Actual ratio;
5) Ratio % error;
6) Polarity
7) VA rating
8) Power factor;
CT
N. 3
Burden, secondary
side
- IN secondary
(nominal value);
- Voltage input.
- Current output
Low I AC to
CT burden
CT burden to Vin
1) I out (secondary);
2) V out (secondary);
3) Phase V-I out (secondary);
4) Power factor;
5) VA rating;
CT
N. 4
Excitation curve
- Voltage output
- I nom secondary
- VA rating
- Accuracy class
- Overload
- Internal loss
- Standard (IEC,
ANSI: see NOTE)
High V AC to
CT secondary
1) High V AC out;
2) I out of High V AC;
3) Iout-Vout curve;
4) Current at knee, IKm;
5) Voltage at knee, VKm
CT
N. 5
Winding or burden
resistance
- Temperature
compensation Y/N
- Ambient and target
temperatures
Low I DC to CT
burden or
winding
CT burden to Vin
1) Low I DC out;
2) V of lowI DC out;
3) Resistance;
4) Compensated resistance
CT
N. 6
Voltage withstand
- Max High V AC ;
- Max I test
- Tmax
High V AC to:
Primary and
secondary;
1) High V AC out;
2) I out of High V AC ;
3) Elapsed Time
CT
N. 7
Polarity by impulses
Low IDC to CT
primary
CT sec. to Iin
1) I DC out;
2) I secondary;
3) Polarity
NOTE: for the excitation curve test, the following standards apply:
1. IEC 60044-1; paragraph 14.4.1. The knee point is the voltage at which the increase of 10% of
voltage causes the increase of the 50% of the exciting current.
2. ANSI C57.13.1; chapter 9. When you plot a log-log diagram with the excitation current on the X
axis and the exciting voltage on the y axis, the knee point is the one where the tangent of the curve
is at 45°.
3. ANSI C57.13.1; chapter 9. When you plot a log-log diagram with the excitation current on the X
axis and the exciting voltage on the y axis, the knee point is the one where the tangent of the curve
is at 30°.
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