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Certainly! Let’s delve into the essential aspects of Erection, Testing, and Commissioning of Isolated Phase Bus Duct (IPBD) , with a focus on the specific tests you mentioned.

1. Erection:

Installation: Properly align and support the IPBD between the generator and transformer.

Support Insulators: Securely attach insulators to support structures.

Welding: MIG Welding on Bus Duct Conductor & Enclosure

Hardware: Ensure correct tightening of bolts and nuts.

Insulation: Verify the integrity of insulation.

Foreign Material: Remove debris or foreign objects inside the bus duct.

2. Testing:

Megger Test (Insulation Resistance Test):

Purpose: Checks insulation quality.

Procedure: Apply a high DC voltage using a Megger meter. Measure resistance between conductors and ground.

Interpretation: High resistance indicates good insulation.

Millivolt Drop Test:

Detects issues like eroded or contaminated contacts.

Procedure: Apply a nominal DC voltage and measure voltage drop across contacts.

Hi-Pot (Dielectric Strength) Test:

Purpose: Ensures good isolation.

Procedure: Apply high voltage (above rated voltage) to identify weaknesses in insulation.

Use: Identifies nicked insulation, stray wires, and other defects.

3. Commissioning:

Functional Testing: Energize the IPBD and verify performance.

Load Testing: Apply load to check current-carrying capacity.

Protection Testing: Test relays and interlocks.

Certainly! Let’s dive into the welding process for Aluminum Pipe Bus used in switchyards and power grids, for Connection between Transformers and Other Grid Accessories used in AIS PowerGrid’s.

1. V-Edge Preparation:

Purpose: V-groove edge preparation creates a large surface area for weld metal to join the tube edges effectively.
Process:

Cut a V-shaped groove into the edges of the aluminum pipe.

Ensure clean surfaces by removing rust, oxides, and mill scale.

Level the edges to the desired angle (typically 80 to 90 degrees for a V-groove).

2. Sleeve Insertion:

Joint Sleeves:

Insert joint sleeves into the aluminum pipe.

These sleeves provide a smooth transition for through bolts passing through the tube sheet.

Process:

Enhance structural integrity and alignment.

Facilitate secure connections between bus bars.

3. Maintaining Uniform Gap:

Industrial Standard Gap:

Maintain a consistent gap between the aluminum tubes during welding.

Proper gap ensures uniform weld penetration and strength.

Follow industry guidelines for specific gap dimensions.

4. Welding Process Selection:

TIG (Tungsten Inert Gas) Welding:

Precise and controlled.

Uses a non-consumable tungsten electrode.

Requires filler wire for melting.

Ideal for thin aluminum sections and critical applications

MIG (Metal Inert Gas) Welding:

Faster and suitable for thicker sections.

Uses a consumable wire electrode.

Shielding gas protects the weld.

Commonly used for aluminum fabrication.