ZES ZIMMER LMG450, User Manual

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Technical data LMG450
258
4. power range is the product of current and voltage range, 0
≤
|
λ|≤
1
5. Voltage and current are
≥
10% and
≤
110% of rated range
6. calibration interval 1 year
7. Adjustment was done at 23°C.
Temperature effect: 0.02% of measuring value / K
1.5mA/K DC drift
Influence of coupling mode
Coupling AC: No influence
Coupling AC+DC, DC: Current: additional DC current of up to
±
(5mA)
Active Power: additional DC error of
±
(5mAV²/U
DC
)
13.3.4 Special transformer adjustment (L45-O12)
This option improves the accuracy of active power measuring under following circumstances:
1. AC coupling
2. 45...65Hz
3. PF>0.01
The accuracy under this condition is
±
(0.07% of r 0.02% of range). All other
conditions from the last chapter are still valid.
With this option the phase error between voltage and current channel is <0.012° at 50Hz.
Without this option the phase error is <0.046°.
13.3.5 Modified voltage channel for 1kV input (L45-O15)
With this option, the maximum allowed rms value of the voltage is 1000V in the 600V range.
The exact specification is as follows:
Max. voltage U* vs. U and PE: 1000V working voltage, 1600V peak value of the working
voltage, 1000V transient over-voltages
Max. voltage U vs. PE: 600V/CATIII or 1000V/CATII
13.4 ZES current sensors
Most ZES sensors have an EEPROM implemented in which we have stored the name, scaling,
ranges, adjustment and delay time of the sensor. The LMG500 recognises automatically, which
ZES sensor is connected and sets up the range menu. Further on we correct some of the errors