Transformer Repair Services in HCMC: Characteristics and Process

Transformer Repair in HCMC, excluding major units, encompasses fault inspection, maintenance, repair, and rewinding. Requires professional technicians for effective handling.

Transformer Repair Services

Transformer repair services in HCMC include quick inspection and handling of power outages at 22/0.4 kV substations, repair and rewinding of single and three-phase transformers, as well as maintenance and overhaul of substations with all technical stages. This service requires experienced technicians and modern equipment to timely handle arising issues.

The transformer repair process includes several complex stages from inspection, cleaning, handling minor damages to comprehensive overhauls such as transformer winding or core repair, to ensure the device’s longevity and safety. The work begins with cutting off the transformer’s power supply, draining oil, dismantling to access parts needing repair; then proceed with the repair steps depending on the level of damage, and finally, thorough inspection and testing before returning the transformer to operation.

Main repair levels for transformers include:

• Minor Maintenance: Includes quick repairs without oil draining or machine removal, focusing on external cleaning such as casing cleaning, replacing silica gel, and inspecting components like gaskets, cooling systems, lightning protection, explosion-proof membranes, and input bushings.
• Periodic Overhaul: Involves drawing out the machine or removing the core for comprehensive inspection and repair, potentially including drying to restore insulation.
• Restorative Overhaul: For severe damages, can replace or rewind all or part of the winding, repair the iron core, and restore insulation for the iron sheets.

The maintenance and repair process needs to adhere to safety regulations, including power off and grounding, locking switchgear to prevent accidents. Regular inspections (every 3-6 months) are effective in detecting early signs of damage, aiming to reduce major repair costs and explosion risks.

Regular tasks during the process include:

• Cleaning the casing and insulating ceramic parts with specialized chemicals.
• Inspecting and repairing gaskets, valves, welds, and other insulating parts.
• Changing or adding transformer oil, checking and draining impurities in the auxiliary oil tank.
• Inspecting the cooling system operation and lubricating motor bearings.
• Testing functions, measuring insulation resistance, oil resistance, and load testing to ensure the machine operates according to technical specifications.
• Surface repair, oil maintenance, and insulating painting, regulator maintenance.

Maintaining and repairing transformers not only extends the equipment’s lifespan but also ensures stable electrical system operation, preventing serious incidents and accidents related to electricity.

Technical Stages in Transformer Repair

Technical stages in transformer repair include: cleaning and filtering insulating oil, inspecting and cleaning accessory systems such as breakers, isolating switches, and measuring protective control equipment. Besides, cleaning and maintaining windings, cores, repairing cooling equipment, desiccant tanks, valves, inlet bushings, and drying the transformer’s interior are essential steps. Upon completion, machine trials according to standards are conducted and the casing is repainted if necessary before completing assembly and oil filling.

Repairing transformers is an essential part of ensuring the electrical system operates stably and efficiently. This process includes steps from minor maintenance, periodic overhauls to restorative overhauls, depending on the device’s current state and needs.

1. Minor Maintenance: This is a light repair process not requiring oil draining or opening the machine’s interior. This stage includes inspecting and repairing minor external errors, cleaning transformer oil in the auxiliary oil tank, replacing silica gel in breathing devices, and checking the cooling system as well as valves and gaskets. Additionally, inspection and cleaning of accessory systems like lightning protection and explosion-proof membranes are also conducted.

2. Periodic Overhaul: Involves a more detailed and complex process, including extracting and thoroughly inspecting the machine. This includes cleaning and replacing insulating oil, checking windings and iron cores, as well as repairing cooling equipment when necessary. After completing these steps, the transformer is assembled and tested under technical specifications to ensure proper operation.

3. Restorative Overhaul: For transformers with significant damage, rewinding or replacing damaged parts is necessary. This process includes transformer testing for insulation and performance before proceeding with complete assembly.

Alongside the main procedures, maintaining and repairing transformers must also follow additional technical steps such as testing insulation values, cleaning connections, and checking the efficiency of cooling systems. Sampling oil for quality analysis is also a vital part of ensuring stable post-repair operation.

Common Issues and Remedies

Common transformer issues include loss of insulating oil, windings damage, and cooling equipment problems. Most importantly, a thorough inspection process is needed to detect issues like damaged no-load tap changers or contaminated insulating oil. Quick, accurate corrective measures will help avoid power supply disruptions and minimize financial damage to investors.

During construction, issues can occur at various stages such as surveying, design, construction, and operation utilization. Identifying these errors is necessary to propose appropriate corrective measures.

1. Surveying Construction Issues: Errors in geological surveys not only affect safety but can also result in high correction costs. Therefore, the survey must meet standards and expertise must be ensured.

2. Design Issues: Inaccurate load calculations or wrong reinforcement layout lead to loss of load-bearing ability. Design needs to pay attention to every small detail to ensure maximum safety for the construction.

3. Construction Issues: Construction process errors or material quality degradation can lead to serious consequences. Thus, adhering to the process and strictly checking material quality before use is essential.

4. Operation, Usage Issues: Functional changes or lack of regular maintenance can damage the building. Maintaining the building and adhering to the initial design are indispensable factors.

5. Other Specific Causes: Issues related to contractor capacity and construction equipment need stringent monitoring and quality control. Ensuring the safety and standards of construction machinery and materials will minimize risks to the project.

Corrective and Preventive Measures to enhance effectiveness and safety include:

• Enhancing the quality and standards of construction surveys.
• Meticulous checks and increasing precision in design.
• Ensuring construction processes and material quality.
• Focusing on training and enhancing specialized skills of contractors and supervisors.
• Strengthening maintenance and upkeep of construction to protect against damaging factors and wear.

Focusing on these aspects not only enhances the safety and longevity of the construction but also avoids economic losses for investors.

Additional Services like Transformer Rental

Besides repairs, some units also offer transformer rental services during repair periods. This helps ensure continuous operation for customers and is a practical solution in HCMC. This service is usually available at professional entities, ensuring smooth transition without affecting the customer’s business operations.

Transformer rental services are becoming an important part of maintaining electrical system stability, especially when temporary transformer use is needed for short-term constructions or projects. Rental transformers are often used in temporary support cases due to power source issues or during construction and testing. Notably, transformer rental is a flexible solution for export processing zones and factories to stabilize voltage in the short term.

Rental transformers usually vary in capacity, from small to large capacity 3-phase transformers such as 10KVA, 15KVA, 20KVA, 30KVA, 45KVA, 60KVA, 75KVA, to 100KVA, serving various customer needs. This ensures technical requirements for transformer capacity suitable for each specific project.

These products are all new transformers, meeting full technical and safety standards, might be dry transformers, oil-immersed transformers, or electrical power transformers used in different electrical systems. Rental services usually come with support consulting equipment, helping select the right type of transformer needed to ensure temporary voltage stability for production and business activities.

Besides, some units also provide additional stabilizer rental, to maintain a stable power source, counteract phenomena like undervoltage or overvoltage, protecting electrical equipment from damage, and improving system operation efficiency.

All these factors make transformer rental services an optimal choice for businesses wanting to save investment costs while maintaining flexibility in operating their electrical systems.

Repairing transformers in HCMC not only enhances equipment efficiency and longevity but also ensures continuous and safe operation. Professionalism in each technical stage, from maintenance, repair to transformer rental, greatly contributes to sustainable development for each business.

Contact QuangAnhcons via Hotline: +84 9 1975 8191 for professional and reliable transformer repair services in HCMC.

QuangAnhcons provides transformer repair services in HCMC, including fault inspection, maintenance, and transformer rental. A team of experienced technicians, using advanced equipment, ensures timely resolution of arising issues.