Requirements - ABB REX 521 Technical Reference Manual, General

REX 521
3.
8
Protection Relay
Technical Reference Manual, General

Requirements

If the environmental conditions differ from those specified in section "Technical
data", as to temperature and humidity, or if the environmental conditions around the
protection relay contains chemically active gases or dust, the relay should be
visually inspected in association with the secondary testing. The visual inspection
should focus on:
• Signs of mechanical damage to the relay case and terminals.
• Signs of corrosion on terminals or on the case.
• For information about the maintenance of relays, refer to section "Service" on
page 40.
Protection relays are measuring instruments and should be handled with
!
care and protected against moisture and mechanical stress, especially
during transport.
1MRS 751108-MUM