7SR21 & 7SR22 Performance Specification
Unrestricted © 2013 Siemens Protection Devices Limited Page 19 of 68
1.4.3.5 Fast Transients
IEC 60255-22-4 Class A (2002)
Type Level Variation
5/50 ns 2.5 kHz repetitive 4 kV
£ 5 %
1.4.3.6 Surge Immunity
IEC 60255-22-5; IEC 61000-4-5
Type Level Variation
Analogue Inputs.
Line to Earth.
4.0 kV ≤ 10 % or 1 mA
Case, Aux Power & I/O.
Line to Earth.
2.0 kV ≤ 10 % or 1 mA
RS485 Comms Port.
Line to Earth.
1.0 kV No Data Loss
Analogue Inputs.
Line to Line.
1.0 kV ≤ 10 % or 1 mA
Case, Aux Power & I/O.
Line to Line.
1.0 kV* ≤ 10 % or 1 mA
* Note: 45 ms pick-up delay for DTL applied to binary inputs
1.4.3.7 Conducted Radio Frequency Interference
IEC 60255-22-6
Type Level Variation
0.15 MHz to 80 MHz 10 V
£ 5 %
1.4.3.8 Magnetic Field with Power Frequency
IEC 61000-4-8 level 5
100 A/m, (0.126 mT) continuous
50 Hz
1000 A/m, (1.26 mT) for 3 s
To Next Page
Loading...
