P92x/EN TD/E11 Technical Guide
Technical Data
Page 24/30 MiCOM P921-P922-P923
9. ACCURACY
If no range is specified for the validity of the accuracy, then the specified accuracy
shall be valid over the full setting range.
9.1 Reference conditions
Quantity Reference conditions Test tolerance
General
Ambient temperature
20 °C ±2°C
Atmospheric pressure 86kPa to 106kPa -
Relative humidity 45 to 75 % -
Input energising quantity
Voltage Vn
±5%
Frequency 50 or 60Hz
±0.5%
Auxiliary supply DC 48V or 110V
AC 63.5V or 110V
±5%
9.2 Measurements accuracy
Quantity Range Accuracy
Voltage Vn
±2%
Frequency 40 - 70Hz
±10mHz
9.3 Protection Accuracy
Functions Range Operate Reset Timer Accuracy
Undervoltage protection
(V<, V<< and V<<<)
5-130V (range 1)
20-480V (range 2)
DT : Vs
±
2%
IDMT : V
operate
= 0.95Vs
±
2%
(1.02-1.05) V
operate
±
2%
Greater of 2% or 20ms
Greater of 5% or 40ms
Overvoltage protection
(V>, V>> and V>>>)
5-260V (range 1)
20-960V (range 2)
DT : Vs
±
2%
IDMT : V
operate
= 1.1Vs
±
2%
(0.95-0.98) V
operate
±
2%
Greater of 2% or 20ms
Greater of 5% or 40ms
Residual voltage protection
(V
0
>, V
0
>> and V
0
>>>)
0.5-130V (range 1)
2-480V (range 2)
DT : Vs
±
2%
IDMT : V
o
erate
= 1.1Vs
±
2%
(if direct measurement)
0.95 V
operate
±
2%
Greater of 2% or 20ms
Greater of 5% or 40ms
Under/Over frequency 40 – 70Hz
DT : fs
±
10mHz fs
±
50mHz
Greater of 2% or 20ms
NOTE : For residual voltage protection :
–0.5V ® 4V (range 1) : hysteresis = V
operate
– 0.2V
–2V ® 16V (range 2) : hysteresis = V
operate
– 0.8V
The instantaneous operating time for under/over frequency is
50 ms (minimum).
The instantaneous operating time for under/over voltage is
≤30 ms.
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