As shown in figure "A" of the illustration,...

🔍 Key Concepts

• Compare figure A and B and note which one actually uses a ring (core-balance) current transformer around the phase conductors • Look closely at how the circuit in A connects to the system neutral/ground and what is being measured (voltage/ current through a resistor) • Recall what a lamp-type ground detector looks like (number of lamps, where they are connected) versus a current transformer scheme

💭 Think About

• In figure A, ask yourself: is any device encircling all three phase conductors, or is the detection done by measuring current or voltage from the system to ground? • Which of the four answer types would typically use a high‑resistance connection to ground with a meter and alarm relay? • Which type in the list would most likely be shown in figure B, and therefore is NOT the one used in figure A?

✅ Before You Answer

• Identify whether figure A shows any lamps in series across phases to neutral/ground (typical of lamp‑type detectors) • Check if the drawing shows a current transformer symbol around all three phase lines (typical of core‑balance protection) – is that really present in A or only in B? • Confirm whether the device in A is injecting a separate DC source into the system, or simply using the existing AC system voltage through a resistor (current limiter) to ground with a meter/relay

As shown in figure "A" of the illustration, what type of ground fault detection system is illustrated? Illustration EL-0132

a direct current injection system

a neutral to ground current transformer system

a set of ground detection lamps system

a core-balance current transformer system

🔍 Key Concepts

💭 Think About

✅ Before You Answer