FAQ No. FAQ01608
Question
What is the estimated DC output voltage of an SET Current Converter?
Answer
A schematic diagram showing the operating principle for the SE is shown
below.
|
3-phase current |
Percentage of SET current
setting tap value |
| Output voltage |
40 |
100 |
200 |
400 |
600 |
| DC output voltage (VDC) |
8.4 |
21 |
42 |
84 |
123 |
Note 1: This is the output voltage
when connected to an SE Motor Protective Relay or SAO Current Sensor. When
connected to any other model, the output voltages will be about the same
as those shown in the above table when the input impedance is 13.3 k Ω
Note 2: When testing an SE Motor
Protective Relay or SAO Current
Sensor with the output voltages shown in the
above table, consider the voltage values to be a guideline only.
Example: When the SET-3A is used and the tap is
set to 20 A (with current passing through the primary conductor one time)
• When the motor current is 100% (20 A) of the current setting tap value,
the output voltage of the SET-3A will be approximately 21 VDC.
• When the motor current is 200% (40 A) of the current setting tap value,
such as it might be during startup or in an overload condition, the output
voltage of the SET-3A will be approximately 42 VDC.
SET-3A/3B Current Converter
Three-phase Input Current and Output Voltage Characteristics
Other Measuring & Monitoring Relay
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