General Device Data
327
7SS52 V4 Manual
C53000-G1176-C182-3
9.2.17 Service Conditions
The relay is designed for use in industrial environment, for installation in standard re-
lay rooms and compartments so that with proper installation electro-magnetic compat-
ibility (EMC) is ensured. The following should also be heeded:
• All contactors and relays which operate in the same cubicle or on the same relay
panel as the digital protection equipment should, as a rule, be fitted with suitable
spike quenching elements.
• All external connection leads in substations from 100 kV upwards should be
screened with a screen capable of carrying power currents and earthed at both
sides. No special measures are normally necessary for substations of lower voltag-
es.
• Individual modules must not be withdrawn or inserted under voltage. In withdrawn
condition, some components are electrostatically endangered; during handling the
EEC standards (standards for electrostatically endangered components) must be
observed. The modules are not endangered when plugged in.
9.2.18 Design Versions
Central unit SIPAC subrack IP 20
Terminals IP 21
Bay unit Housing (7XP20)
– with window pane front IP 51
– without window pane front IP 30 [IP 20]
1)
Terminals IP 21
Degree of protection acc. to EN 60529
Weight Weight at maximum configuration
Central unit
– SIPAC subrack 14,3 kg
Bay unit
– flush-mounted 8.1 kg [5,5 kg]
1)
– surface-mounted 11.8 kg [not available]
1)
Dimensions See dimensional drawings, Chapter 9.3, page 329
1)
Values in brackets [ ] for Bay unit 7SS525
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