ABB Industrial IT enabled REX 521 Technical Reference Manual, General page 9

Protection relay

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Technical Reference Manual, General

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If the environmental conditions differ from those specified in section "Technical

data" on page 37, 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 47.

Protection relays are measuring instruments and should be handled with

care and protected against moisture and mechanical stress, especially

during transport.

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