In the diagram of the switchboard shown in...

🔍 Key Concepts

• Review how current transformers (CTs) are typically used in high‑current AC generator switchboards • Note which instruments in the diagram are connected through the Current XFMR versus the Potential XFMR • Recall the difference between instruments that measure current/power and those that measure voltage

💭 Think About

• Follow the wiring from the labeled Current XFMR in the lower part of the diagram up to the instruments on Panel 1 and Panel 3—what kind of quantities are those instruments indicating? • Think about why you would NOT want to run full generator load current directly through sensitive meters on the panel—what problem would that cause? • Ask yourself whether a CT is normally used to step current up or down for measurement and protection circuits on shipboard switchboards

✅ Before You Answer

• Confirm which meters (A, kW, PF, V) are actually supplied from current versus voltage transformers in the illustration • Verify whether a volt-meter needs a current transformer or a potential (voltage) transformer instead • Make sure the direction of transformation you choose (high‑to‑low or low‑to‑high) matches how CTs are safely used with ammeters, wattmeters, and power factor meters on generators

In the diagram of the switchboard shown in the illustration, what is the purpose of the current transformers? Illustration EL-0003

transform relatively high generator load current to low instrument input current for ammeters, wattmeters, and the power factor meter

transform relatively low generator load current to high instrument input current for ammeters, wattmeters, and the power factor meter

transform relatively high generator load current to low instrument input current for voltmeters

transform relatively low generator load current to high instrument input current for voltmeters

🔍 Key Concepts

💭 Think About

✅ Before You Answer