Answer / Vinika Choudhary

Calculating no-load current in a transformer is done using the open circuit (no-load) test. However, the exact method may vary depending on the type of transformer and the specific measurement apparatus available.nFor a simple two-winding transformer:
1. Connect an ammeter between the primary winding and a load resistor (usually 50 or 100 ohms).
2. Apply power to the primary winding while measuring the current in the ammeter, which represents the no-load current.
3. Record the reading when the transformer's secondary winding becomes energized (known as the no-load current point).
4. Calculate the no-load current percentage using the following formula: No-Load Current Percentage = (No-Load Current / Full-Load Current) * 100

What are the site acceptance tests for power cables, DG Sets, LT panels & 30kVA UPS ?

1 Answers  

---

What are the rating wise protections required for Generators from 600KVA to 2000KVA

3 Answers  

---

In oil transformer which oil is used & what should be the insulation resistance & heating capacity.

2 Answers  

---

What will happen if the voltage in my house drops from 220V to any lower voltage?

1 Answers  

---

Where double earthing is required? Is there any power specification to have double earthing?

10 Answers   Delphi,

---

what is the difference between metalhalide and mercury vapour lamp

1 Answers  

---

Why current shoots up in the secondary on the knee point voltage during saturation test of CT? How core saturation effects the secondary current (while the primary side is open)? What the logic behind this?

1 Answers  

---

Why AC loads wont used in DC input supply? and Why DC loads wont used in AC input supply?

3 Answers   Bhel,

---

CT Ratio of a energy meter connection is Red Phase : 100/5A, yello Phase : 50/5A & Blue phase : 100/5 A what is the overall Multiplication factor

1 Answers  

---

Can anybody tell me how to calculate(formula) earth flat size(for copper and aluminium).

3 Answers  

---

For DG or Transformer body earthing, is it necessary to terminate the earth bus to earth pit directly? If not terminated to earth pit directly in earth pit and connected to any common bus strip which ultimately connects to earth pit, what will be the pros and cons?

1 Answers  

---

11 kv metering is done in my factory.Meter show PF 1.000 but kvarh lag&lead show 24&94 respectively & Avg.PF is .956 .? is what i do for inproove my PF to 1.000

3 Answers  

---