Requirements - ABB REX 521 Technical Reference Manual, General

1MRS 751108-MUM
3.
Protection Relay
Technical Reference Manual, General

Requirements

If the environmental conditions differ from those specified in section "Technical
data" on page 44, as to temperature and humidity, or if the environmental conditions
around the protection relay contain 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 55.
Protection relays are measuring instruments and should be handled with
!
care and protected against moisture and mechanical stress, especially
during transport.
REX 521
13