Characteristic Value
±3% of the set value or ±0.05 Ω
Phase angle: ±2°
Reset ratio Typically 0.96/1.04
Operate time accuracy
1
±1.0% of the set value or 20 ms
4.8 Power protection
4.8.1 Underpower protection DUPPDPR (ANSI 32U)
4.8.1.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Underpower protection DUPPDPR P< 32U
4.8.1.2 Function block
Figure 589: Function block
4.8.1.3 Functionality
The underpower protection function DUPPDPR is used for protecting generators
and prime movers against the effects of very low power outputs or reverse power
condition.
The function operates when the measured active power falls below the set value.
The operating characteristics are according to definite time DT.
This function contains a blocking functionality. It is possible to block the function
outputs, timer or the function itself.
4.8.1.4 Analog channel configuration
DUPPDPR has two analog group inputs which must be properly configured.
1
Measured with static power output (SPO)
1MRS759142 F Protection functions
REX640
Technical Manual
1055
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