You are in the planning stages of setting...

Question 1 / 205eccefa4bacbc34ba4d48594

Question 1 of 205eccefa4bacbc34ba4d48594

You are in the planning stages of setting the instantaneous trip of a ship's service generator circuit breaker. According to 46 CFR, Subchapter J (Electrical Engineering), what statement is true regarding the criteria for the instantaneous trip set point, assuming the generator is capable of being paralleled?

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🔍 Key Concepts

• 46 CFR Subchapter J requirements for generator circuit breaker protection on ships • Meaning of instantaneous trip versus long-time/short-time overcurrent settings • Relationship between available short-circuit current and protective device trip settings

💭 Think About

• Think about what instantaneous trip protection is designed to prevent when a generator is paralleled to a system with high fault current levels. • Consider whether you want the breaker to trip during normal inrush or paralleling transients, or only during true fault conditions. • Ask yourself: should the trip setting be chosen so that it reliably operates for a fault that reaches the maximum asymmetrical short-circuit current, or so that it stays just clear of it?

✅ Before You Answer

• Verify in 46 CFR Subchapter J that the instantaneous trip must coordinate with the generator’s maximum short-circuit current capability. • Check whether the regulation talks about setting the trip above or below the available asymmetrical short-circuit current. • Confirm that the intent is to protect the generator and system while avoiding nuisance trips during normal operation and paralleling.

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Question 1 of 20

The trip point should be set below but as close as practical to the maximum asymmetrical short circuit current available.

The trip point should be set above but as close as practical to the maximum asymmetrical short circuit current available.

The trip point should be set considerably above the maximum asymmetrical short circuit current available.

The trip point should be set exactly equal to the maximum asymmetrical short circuit current available.

Question 1 / 205eccefa4bacbc34ba4d48594

Question 1 of 205eccefa4bacbc34ba4d48594

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Question 1 of 20

5eccefa4bacbc34ba4d48594

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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