Which parameter defines the output duration for arc-flash detection relays during testing?

The output duration for arc-flash detection relays during testing is defined by the duration parameter. This refers to the specific time that the relay will remain in the operating state upon detecting an arc flash condition. The duration is critical as it determines how long the relay will take to respond to the event, allowing enough time for protective devices to operate and isolate the fault to protect personnel and equipment.

Testing the relay's output duration helps ensure that it can respond quickly enough to minimize the impact of an arc flash. This is especially important in industrial environments where the consequences of delayed response can be severe. By establishing the appropriate duration, the effectiveness of the arc-flash detection system can be validated, ensuring safety standards are met.

While resistance, voltage, and current are all important parameters to consider in the context of electrical systems, they do not specifically define the output duration of arc-flash detection relays. Resistance may play a role in determining the parameters of the circuit, voltage may influence the operating conditions, and current is essential for determining fault levels, but the duration is the key factor for timing the relay's response in arc-flash scenarios.