Under what condition will a network protector open?

A network protector opens primarily to protect the network from conditions that could cause damage to equipment or disrupt the supply of electricity. The correct condition under which a network protector will open is specifically related to the detection of faults in the system. When there is a primary fault that results in a reverse current of 6 amps or greater, the network protector acts to isolate the problem by opening the circuit. This safeguard ensures that any issues such as short circuits or other electrical faults do not propagate further into the network, which could lead to serious safety hazards or equipment failure.

In contrast, conditions such as exceeding 10 amps of load, performing routine maintenance, or reaching a specific temperature threshold do not invoke the opening of a network protector. Load limits are typically managed through other means, and routine maintenance does not warrant the activation of protection mechanisms. Temperature thresholds are also managed by different types of protection or cooling systems. Thus, the unique responsiveness of the network protector to primary faults and significant reverse current is crucial for maintaining network stability and safety.