General Device Data
317
7SS52 V4 Manual
C53000-G1176-C182-1
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• Individual modules must not be withdrawn or inserted under voltage. In withdrawn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 Cubicle IP 54
Surface-mounted housing (wall-mounted) IP 54
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
– Surface-mounted housing 43.0 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 319
1)
Values in brackets [ ] for Bay unit 7SS525
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