Electrical Tests
Standards
IEC 60255 (product standard)
Additional standards are listed for the individual tests.
Installation Requirements
Overvoltage category
III
Degree of pollution
2
Protection class
1
Insulation and Safety Tests
Standards
IEC 60255-27
Voltage test (routine test)
AC 3.25 kV, 50 Hz, 1 s (Terminal A)
Voltage test (routine test)
DC 6.2 kV, 1 second (secondary Terminal B)
Surge immunity test (type testing), all circuits
6 kV (peak value) 1.2 µs/50 µs 0.5 J
3 positive and 3 negative impulses at intervals of 1 s
Insulation resistance
> 100 MΩ @ DC 500 V
Resistor of protective equal-potential-bonding
< 0.1 Ω DC 12 V, 30 A after 1 min
EMC Immunity Tests (Type Tests, Test under Mounting Conditions)
Standards
IEC 60255-1 and -26
(product standards) EN 61000-6-2 (generic standard)
Electrostatic discharge test
IEC 61000-4-2
Contact discharge 8 kV, both polarities
Air discharge 15 kV, both polarities, 150 pF Ri = 330 Ω
Electrical fast transient/ burst
immunity
IEC 61000-4-4
4 kV, 5 ns/50 ns, 5 kHz
Burst length 15 ms, Repetition rate 300 ms
Both polarities Ri = 50 Ω
Test duration ≥ 5 min
High-energy surge voltages
IEC 61000-4-5
Pulse: 1.2 µs/50 µs
Measuring inputs, binary inputs,
and relay outputs (no differential
mode testing)
Common mode: 4 kV, 42 Ω, 0.5 µF
Differential mode: 1 kV, 42 Ω, 0.5 µF
Standard for Surge Withstand
Capability (SWC)
IEEE Std C37.90.1
2.5 kV (peak value) 1 MHz
τ = 15 µs, 400 impulses per sec.
Test duration ≥ 10 s, Ri = 200 Ω
Common mode and differential mode test
Damped oscillatory wave im-
munity test
IEC 61000-4-18
1 MHz, 2.5 kV (peak value)
3 MHz, 10 MHz, 30 MHz, 2 kV (peak value)
Test duration ≥ 60 s
1.6
1.6.1
1.6.2
1.6.3
1.6.4
7XR81 – Coupling Device for Rotor Ground-Fault Protection
1.6 Electrical Tests
20
SIPROTEC, Coupling Units for Generator Protection, Manual
C53000-H5040-C072-1, Edition 09.2018
