ABB SACE Emax 2 Series - Isolation Transformer; Measurements

ABB | SACE Emax 2
Electronic accessories | 2 - Ekip Measuring modules
165 | © 2013 ABB | 1SDH001000R0002 - L7804
Isolation transformer
If the input phase-to-phase voltage supplied to the modules is greater than nominal 690 V AC
(maximum 760 V AC), external socket-outlets must be used.
In the presence of external socket-outlets, the use of an isolation transformer is mandatory.
The following table lists the specifications that the transformer must have:
Characteristics Description
Mechanical
• Mounting: EN 50022 DIN43880 guide.
• Material: self-extinguishing thermoplastic.
• Protection class: IP30.
• Electrostatic protection: with screen to be connected to
earth.
Electrical
• Precision class: ≤ 0.5.
• Performance: ≥ 10 VA.
• Overload: 20 % permanent.
• Insulations: 4 kV between inputs and outputs, 4 kV
between screen and outputs, 4 kV between screen and
inputs.
• Frequency: 45…66 Hz.
Measurements
The following table lists the measurement precision for the modules:
Quantity Interval Accuracy
Phase-to-phase voltage
(1)
100…1150 V AC ± 0.5 % @ 45…66 Hz
Frequency
(2)
30…80 Hz ± 0.1 %
(3)
(1)
With phase-to-phase voltage V greater than nominal 690 AC (maximum 760 V AC), in the presence of
external socket-outlets and an isolation transformer.
(2)
The measurement of the frequency is started up with a measured phase-to-phase voltage ≥ 36 V AC,
and is stopped with a measured phase-to-phase voltage ≤ 32 V AC.
(3)
In the absence of harmonic distortion.