Question

Which transformer is CT and PT?

Answer 1

Alright! Let’s explain this simply:

- **CT** means **Current Transformer**.
- **PT** means **Potential Transformer** (also called **Voltage Transformer**).

Both are special types of transformers, but they are used for **different purposes**:

---

### **Current Transformer (CT)**  
- CT is used to **measure high current** safely.  
- It **steps down** a large current (like hundreds or thousands of amps) to a **small current** (like 5A or 1A) that we can measure easily with meters or protect circuits.  
- **Example:** If you have a current of 1000A in a line, the CT can reduce it to 5A for measurement.  
- CT is **connected in series** with the load (because current must be same in series).

---

### **Potential Transformer (PT)**  
- PT is used to **measure high voltage** safely.  
- It **steps down** a high voltage (like 11kV or 33kV) to a **lower voltage** (like 110V or 220V) for easy measurement.  
- **Example:** If you have 11,000V, the PT brings it down to 110V for meters or relays.  
- PT is **connected in parallel** with the line (because voltage is same across parallel).

---

### **Simple way to remember:**
| Type | Full Form | What it Measures | Connection Type |
|:---|:---|:---|:---|
| CT | Current Transformer | Current (Amps) | Series |
| PT | Potential Transformer | Voltage (Volts) | Parallel |

---

Would you also like me to show you a simple diagram of CT and PT connections? It will make it even easier!