ISA DRTS.3 PLUS - Angles; Output Frequency

Doc. SIE62153 Rev. 1 Page 10/24
. Zero-sequence component VO of the other three voltages V1, V2 V3. Via software the output can
be selected to be: VO = (V1+V2+V3)/3 or VO = (V1+V2+V3)/1.73 (bolded stays for vector sum).
Note that with last two selections the zero sequence component is limited to 125 V (or 300 V if the
optional range is available).
- For the zero-sequence output, the following specifications apply.
. Range: 125 V – Optionally 300 V.
. Output accuracy: ± 0.5% of the value ± 0.1% of the range.
3.5 Angles
- All angles are referred to the same absolute reference.
- Possibility to set independently the angle of all outputs: V1; V2; V3; V4; I1; I2; I3; I4; I5; I6, in
the field between zero and ± 360° (phase angle).
- Possibility of slewing all the angles. Variation range: 0.1°/s to 999 °/s.
- Angle resolution: 0.01°.
- Angle accuracy (40 to 60 Hz): typical ± 0.02°; maximum ± 0.1°.
- Angle accuracy (5 to 40 Hz): maximum ± 1°.
- Angle accuracy (60 to 2 kHz): maximum ± 5°.
3.6 Output frequency
- Possibility of selecting the output frequency between 0.0000 and 1999.9999 Hz.
- Possibility to set the fault frequency on:
. All outputs;
. V1 only;
. Voltages V1-V2 -V3;
. I1 plus V1 – V2 – V3;
. All outputs unless V4;
. V1 and V2.
With all selections unless the first one, not selected outputs stay at pre-fault frequency.
- Maximum frequency error: 0.5 ppM (25 uHz @ 50 Hz).
- Temperature drift of the oscillator frequency: 0,1 ppM/°C.
- Resolution: 0.1 mHz.
- Possibility of step switching the output frequency, separately or together with the amplitude
change.
- Possibility of slewing the frequency, with a slope from 0.001 Hz/s to 999.999 Hz/s. Resolution:
0.001 Hz/s.
- Slew accuracy: 0.01 Hz/s, with a minimum of 0.1 Hz/s.