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What is TACT for Relay Protection

Fibre interconnection and data room reference Published 03 Sep 2026

Use this reference to prepare product questions for FD SOLUCIONES. Check interfaces, capacity, protection and installation requirements against the current product documentation.

TACT stands for "Time of Actual Clearing Time" and represents the total time a protective relay takes to detect a fault and trip the circuit breaker.

Definition and Purpose

In relay protection, TACT is the actual clearing time of a fault, encompassing the relay operating time plus the breaker operating time. It is a critical parameter for ensuring selectivity and coordination in power systems, as it determines how quickly a faulted section is isolated while minimizing disruption to the rest of the network.

Accurate TAC

T measurement helps prevent equipment damage and enhances system reliability.

Components of TACT

Relay Operating Time: The time taken by the protective relay to sense the abnormal condition (overcurrent, overvoltage, or fault) and send a trip signal to the circuit breaker. This depends on the relay type (electromechanical, static, or numerical) and its settings. Breaker Operating Time: The time required for the circuit breaker to physically open and interrupt the fault current after receiving the trip signal.

Importance in Power System Protection

Coordination: TACT ensures that only the faulty section is disconnected, allowing upstream and downstream relays to operate in a coordinated manner. Safety: Minimizing TACT reduces the duration of fault currents, protecting personnel and equipment from thermal and mechanical stress. System Stability: Fast and predictable clearing times help maintain voltage and frequency stability in the network.

Practical Considerations

Relay Settings: Numerical relays allow precise TACT adjustments through programmable time-current characteristics, improving selectivity and reducing unnecessary outages. Testing and Verification: TACT is verified during commissioning and periodic maintenance to ensure relays and breakers operate within specified limits. Impact of Fault Type: Different fault types (phase-to-phase, phase-to-ground) may influence TACT due to variations in current magnitude and relay response.

In summary, TACT is a key metric in relay protection that defines the total fault clearing time, combining relay and breaker response. Proper understanding and management of TACT are essential for safe, reliable, and coordinated operation of electrical power systems.

What is TACT for Relay Protection - FD SOLUCIONES OPTICAL SYSTEMS [PDF]

What is TACT for Relay Protection

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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