TRANSDUCER FOR AC VOLTAGE
|
The transducer converts an AC voltage into a load independent DC current or voltage signal which may be used to drive a number of remotely installed instruments.
The measuring principle is "true RMS" and this transducer is therefore suitable for distorted and undistorted AC wave measurements.
The normal response time is suitable for indicating instruments and recorders. A lower ripple - slower response version for data loggers can be supplied.
The output is protected against over-voltages due to surges or accidental contact with insulation testers or the mains supply.
The voltage to be measured is transformed in VT (1) and converted to DC in the RMS/DC converter(3). The auxiliary supply is transformed in VT (2), rectified and smoothed in (4) and is used to power the convertor (3), output amplifier (5) and to provide the offset voltage for the live zero version. The output amplifier (5) provides either a load independent current (with maximum burden) or a load independent voltage (with minimum burden) signal.
| 1. Input | |
| Input quantity: | 0 - 120 / 250 / 500 / 600 V (other values available on request) |
| Frequency: | 45 - 55 - 65 Hz |
| Consumption burden: | 0.4 - 1.2VA depending on range |
| Overload in terms of rated input: | 1.2x indefinitely 1.5x 10 seconds |
| 2. Output | |
| Characteristic: | A or C or D |
| Output quantity: | Impressed current signal (voltage signal on request) |
| Standard values: | 1mA, 5mA, 20mA |
| Maximum load: | 5k Ohm, 2.5k Ohm, 750 Ohm. |
| Maximum output voltage: | 32V DC |
| Maximum output current: | 1.25x rated (typical) 2.00x rated (maximum) |
| Ripple: | 0.5% standard |
| Response time: | 210ms standard |
| 3. Auxiliary power supply | |
| Voltage: | 110 or 220V 50Hz ±20% (other values and DC on request) |
| Burden: | <3.5VA at rated output |
| 4. Accuracy | |
| Error limit at rated conditions: | ±0.5% of range at 23°C and 45-55 Hz sinusoidal wave, form factor 1.11 |
| Linearity error: | 0.05% |
| Long term drift: | 0.25% |
| Temperature shift: | 400ppm/°C |
| Variation with auxiliary supply: | 0.05% for ±20% variation |
| 5. Protection | |
| Impulse tests between isolated sets of terminals: | 5kV (0.5J 1.2/50 wave) IEC standard |
| Voltage withstand rating between sets of terminals: | 4kV 50Hz AC for 1 minute |
| Power voltage across output: | 220V 50Hz indefinitely |
| Surge across output terminals: | 5kV 25J 1kV 4J |
| 6. Physical constraints | |
| Working temperature: | -25 to 13 to 33 to 55°C |
| Storage temperature: | -55 to 75°C (above dewpoint) |
| Relative humidity: | 80% |
| Variation due to external magnetic field (worst case): | 0.05% at 400A/m 50Hz |
| Position: | Surface mounting in any position indoors. |
| 7. Enclosure |
DIN A LDG10 |