Transformers Repair & Transformer Rewinding Services in Nairobi, Kenya

Transformer Repair in Nairobi, Kenya : Transformers are essential devices in electrical systems, allowing for the efficient transmission of electrical energy by changing voltage levels. Understanding how they work and how to rewind them can help maintain their functionality and extend their lifespan. Always follow safety guidelines when working with transformers

What are Transformers?

Transformers are devices that transfer electrical energy between two or more circuits through electromagnetic induction. They are commonly used to increase (step up) or decrease (step down) voltage levels in electrical systems.

How Do Transformers Work?

Basic Components

1. Core: Made of iron or steel, it provides a path for the magnetic field.
2. Windings: Coils of wire wrapped around the core. There are two main types:
   • Primary Winding: Connected to the input voltage source.
   • Secondary Winding: Connected to the output load.

Operating Principle

Transformers work based on Faraday’s Law of Electromagnetic Induction:

1. Alternating Current (AC) flows through the primary winding.
2. This creates a magnetic field in the core.
3. The changing magnetic field induces a voltage in the secondary winding.
4. The voltage ratio between primary and secondary windings is determined by the number of turns in each winding.

Voltage Transformation

The relationship between the primary and secondary voltages and the number of turns in the windings is given by the formula:

VpVs=NpNs\frac{V_p}{V_s} = \frac{N_p}{N_s}Vs​Vp​​=Ns​Np​​

Where:

• VpV_pVp​ is the primary voltage
• VsV_sVs​ is the secondary voltage
• NpN_pNp​ is the number of turns in the primary winding
• NsN_sNs​ is the number of turns in the secondary winding

Transformer Motor Rewinding

Rewinding a transformer involves replacing the windings to repair or modify the transformer.

Steps for Rewinding a Transformer

1. Remove the Core and Windings
   • Carefully disassemble the transformer.
   • Remove the old windings without damaging the core.
2. Inspect the Core
   • Check for any damage or wear on the core.
   • Clean the core to remove any debris or rust.
3. Prepare New Windings
   • Use appropriate gauge wire based on the required current and voltage.
   • Measure and cut the wire to the required length for both primary and secondary windings.
4. Wind the Coils
   • Start winding the primary coil around the core.
   • Ensure the turns are even and tight.
   • After completing the primary winding, insulate it properly.
   • Wind the secondary coil over the primary winding.
5. Insulate the Windings
   • Use insulation material to separate the windings and prevent short circuits.
   • Ensure all connections are secure.
6. Reassemble the Transformer
   • Carefully place the core back into the transformer casing.
   • Secure the windings in place.
7. Testing
   • Test the transformer with a low voltage to ensure it works correctly.
   • Check for any unusual sounds or overheating.

Safety Precautions

• Always disconnect the transformer from the power source before starting.
• Wear protective gear to avoid electric shocks.
• Work in a well-ventilated area to prevent inhalation of harmful fumes.

Transformers are essential devices in electrical systems, allowing for the efficient transmission of electrical energy by changing voltage levels. Understanding how they work and how to rewind them can help maintain their functionality and extend their lifespan. Always follow safety guidelines when working with transformers