Integrated relay protection devices should be used every 4 years
A general rule of thumb would be to visually inspect every one to two years, secondary injection testing every one to three years, and primary injection every three to five years or on major changes. This document also directs personnel to follow the utility procedures in the Protective Equipment Standard Test Procedures (PESTP) Manual and the. They were talking about doing away with full testing on microprocessor based relays. Protective relays and devices have been developed over 100 years ago to provide "lastline"of defense for the electrical systems. They are intended to quickly identify a fault and isolate it so the balance of the system continue to run under normal conditions. Outdated electrical protection increases fire risk, downtime, and liability, requiring timely upgrades.
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