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What is the relay reset ratio?

The reset value at which the protective relay returns to its initial position must be higher than the operating current. This results in a hysteresis defined by the reset ratio R (ratio of release and response values). In modern protective relays, this ratio is approximately R = 0.95 for overcurrent activation.

What is relay ratio?

The current setting of relay is expressed in percentage ratio of relay pick up current to rated secondary current of CT. For example, an over current relay should operate when the system current just crosses 125% of rated current.

What is the procedure of relay testing?

Relay Maintenance and Testing Visual and mechanical inspection. Insulation resistance measurements. Secondary injection tests. Verification of relay settings. Functional testing on wire connections, current and voltage transformers, and all auxiliary devices. Control verification.

What is the 50 51 relay setting?

The instantaneous function (50) of the relay provides an instant trip signal when the level of current flow exceeds the setting of the relays 50 element. The time function (51) of the relay provides a trip signal when the level of current flow exceeds the setting of the relays 51 element for a given period of time.

What is the reset time of a relay?

For Relays with NO contacts only, it is the time until the slowest pair of NO contacts open. For Relays with more than one pair of contacts, the reset time is the time until the slowest pair of contacts release, unless otherwise specified.

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