x/EN TD/Na7
-6 MiCOM P74
Type Tests
Insulation
Per IEC 60255-5: 2000,
Insulation resistance > 100 MΩ at 500 Vdc
(Using only electronic/brushless insulation
tester).
Creepage Distances and Clearances
Per IEC 60255-27:2005
Pollution degree 3,
Overvoltage category III,
Impulse test voltage 5 kV.
High Voltage (Dielectric) Withstand
(EIA RS232 ports excepted).
(i) Per IEC 60255-27:2005, 2 kV rms. AC, 1
min.
Between all case terminals connected
together, and the case earth.
Also, between all terminals of independent
circuits.
1 kV rms. AC for 1 minute, across open
watchdog contacts.
1 kV rms. AC for 1 minute, across open
contacts of changeover output relays.
(ii) Per ANSI/IEEE C37.90-1989 (reaffirmed
1994):
1.5 kV rms. AC for 1 minute, across open
contacts of changeover output relays.
Impulse Voltage Withstand Test
Per IEC 60255-27: 2005
Front time: 1.2 µs,
Time to half-value: 50 µs,
Peak value: 5 kV, 0.5 J
Between all terminals, and all terminals and
case earth.
Electromagnetic Compatibility (EMC)
1 MHz Burst High Frequency Disturbance
Test
Per IEC 60255-22-1: 1988, Class III,
Common-mode test voltage: 2.5 kV,
Differential test voltage: 1.0 kV,
Test duration: 2 s, Source impedance: 200 Ω
(EIA RS232 ports excepted).
Immunity to Electrostatic Discharge
Per IEC 60255-22-2: 1996, Class 4,
15 kV discharge in air to user interface,
display, and exposed metalwork.
Per IEC 60255-22-2: 1996, Class 3,
8 kV discharge in air to all communication
ports.
6 kV point contact discharge to any part of
the front of the product.
Electrical Fast Transient or Burst
Requirements
Per IEC 60255-22-4: 2002. Test severity Class
III and IV:
Amplitude: 2 kV, burst frequency 5 kHz
(Class III),
Amplitude: 4 kV, burst frequency 2.5 kHz
(Class IV).
Applied directly to auxiliary supply, and applied
to all other inputs. (EIA RS232 ports
excepted).
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