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DESCRIPTION
Electromagnetic compatibility
The PR512 microprocessor-based protection
relays ensure correct operation and are immune
to unwarranted trips, even in the presence of
interference caused by electronic apparatus, by
stormy weather conditions or electric discharges.
Moreover they do not interfere with any electronic
apparatus near the installation.
These performances are obtained thanks to the
following construction characteristics:
– the galvanised iron box provides efficient
electromagnetic screening
– special filters on the current transformer inputs
guarantee immunity against conducted interfer-
ence
– the precise construction technique of the printed
circuit helps to keep the level of electromagnetic
sensitivity very low.
The above is in compliance with the EN 50081,
50082 and IEC 255-22 Standards as well as with
European Directive EEC 89/336 regarding
electromagnetic compatibility )EMC), in respect of
which the releases are marked with the CE mark.
Service conditions
– Operating temperature:
- 5 °C ... + 40 °C
– Storage temperature:
- 40 °C ... + 90 °C
– elative humidity without condensation: 90%
– MTBF: 15 years at an operating temperature of
+45°C.
Degrees of protection
The degree of protection of the units mounted in a
switchboard is IP30.
For higher degrees of protection, please consult
ABB.
Technical documentation
For in-depth technical and application aspects,
please ask for the following publications:
– UniMix switchboards 1VCP000008
– UniAir switchboards 1VCP000065
– SafePlus switchboards 1VCP000086
– SD-View systems 1VCP000176.
Quality System and Environmental Man-
agement system: these comply with the ISO
9001 and ISO 14001 Standards respectively and
are certified by an independent body.
UniAir: air-insulated metal-enclosed
switchboards for secondary distribution
Rated voltage ... 24 kV
Rated current ... 1250 A
Short-time withstand current ... 20 kA
SafePlus: gas-insulated metal-enclosed
switchboards for ring main units
Rated voltage ... 24 kV
Rated current ... 630 A
Short-time withstand current ... 20 kA
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