Tandem Enterprises Powering Solutions Together

We offer a full range of services to keep your Power and Distribution Transformers running smoothly and lasting longer.

  1. Servicing:
    • Routine servicing involves the inspection and preventive maintenance of transformers to identify and address any potential issues before they escalate.
    • Cleaning, oil filtration, lubrication, and replacement of worn-out components are part of regular servicing to enhance the efficiency of the transformer and reducing the risk of unexpected breakdowns.
  2. Repairing:
    • In the event of a malfunction or damage, our expert technicians are equipped to diagnose and repair various transformer issues.
    • Repairs may include fixing faulty electrical connections, replacing damaged insulation, oil leak repairs, bushing replacement or addressing issues with the cooling system.
  3. Rewinding:
    • Rewinding is a specialized service for transformers with damaged or faulty windings.
    • Our technicians carefully remove the damaged winding and replace it with new, ensuring the transformer operates at its designed efficiency.
  4. Performance Optimization and Upgrades:
    • Our approach goes beyond fixing existing issues; it aims to optimize the overall performance of transformers. Utilizing advanced diagnostic tools, we assess the transformer's health and make adjustments to enhance efficiency, minimizing energy losses.
    • We offer recommendations and implement upgrades to align older transformers with modern standards. This may involve installing advanced monitoring systems, incorporating safety features, or enhancing energy efficiency for a comprehensive transformation of your electrical infrastructure.
  5. Emergency Response:
    • Our services include a prompt and efficient emergency response team ready to address urgent transformer issues, minimizing downtime and potential damage.
  6. Quality Assurance:
    • All servicing, repairs, and rewinding activities adhere to industry standards and safety regulations.
    • Our commitment to quality assurance ensures that transformers meet or exceed their original specifications after the service is completed.

Experience efficiency right at your doorstep with our On-site Servicing and Overhauling. Our services deliver expert transformer maintenance to your location, ensuring convenience without compromising on quality.

  1. Key Benefits:
    • Minimize Downtime:
      Keep your operations running smoothly without extended equipment transport times.
    • Optimize Efficiency:
      Expert technicians conduct comprehensive inspections on-site for quick responses and optimized operational efficiency.
    • Preventive Maintenance:
      Address minor issues on-site to ensure continued reliability, including cleaning, lubrication, and adjustments.
    • On-site Overhauling:
      For transformers requiring extensive attention, we offer disassembly, refurbishment, and replacement of worn parts.
    • Testing and Quality Assurance:
      Rigorous testing ensures transformers meet or exceed performance standards before being returned to regular operation.
    • Detailed Documentation:
      Comprehensive reports outline work performed, parts replaced, and testing results for future maintenance planning.

At Tandem, we specialize in testing the performance of critical components – protective relays and circuit breakers – essential for safeguarding your electrical systems.

Our testing procedures are designed to identify potential issues, validate the proper functioning of these protective devices, and enhance the overall reliability of your infrastructure. This provides cost savings for our clients by reducing the overall expenses associated with emergency repairs and downtime.

  1. Relay Testing:
    • Rigorous testing is conducted on protective relays to verify their responsiveness to abnormal conditions and ensure prompt and accurate response to faults.
    • Calibration and adjustment of relays are carried out to align them with specified settings, maximizing their effectiveness in protecting your electrical equipment.
  2. Circuit Breaker Testing:
    • Thorough testing of circuit breakers is performed to assess their ability to interrupt fault currents and protect the system from potential damage.
    • Functional tests, including insulation resistance and contact resistance measurements, are conducted to verify the breaker's reliability and performance.

Tandem provides comprehensive Transformer Oil Filtration services, utilizing cutting-edge technology to optimize the performance and longevity of your transformers. We offer two primary methods: High Vacuum Cartridge Filters and Streamline Edge Filters.

  1. High Vacuum Cartridge Filters:

    This method utilizes high vacuum technology to efficiently remove contaminants from transformer oil. The process involves passing the oil through specialized cartridges, effectively trapping impurities such as moisture, gases, and particulate matter. Highly efficient, this method significantly enhances the quality of transformer oil, thereby extending equipment lifespan and reducing the risk of failures.

      Key Features:
      • High Efficiency: Exceptional filtration efficiency removes contaminants down to micron levels, ensuring optimal oil cleanliness.
      • Effective Moisture Removal: Utilizes vacuum technology to eliminate moisture from the oil, preventing degradation and enhancing dielectric strength.
      • Gas Removal: Removes dissolved gases, reducing the risk of corona discharges and prolonging transformer life.
      • Particulate Matter Removal: Captures solid particles suspended in the oil, preventing abrasive wear and minimizing insulation breakdown.
      • Versatility: Suitable for various types and sizes of transformers, adaptable to different operating conditions and oil types.
      • Reliability: Ensures consistent and reliable performance, contributing to the uninterrupted operation of transformers.
  2. Streamline Edge Filters:

    Our Streamline Edge Filters feature an innovative design that maximizes surface area contact between the oil and filter media, facilitating efficient filtration. Specially engineered edges ensure thorough removal of contaminants, including moisture, gases, and particulate matter. This method delivers superior results in terms of cleanliness and performance, contributing to enhanced transformer reliability and durability.

      Key Features:
      • Innovative Design: Utilizes advanced filter design to ensure thorough removal of contaminants, including hardto-remove impurities, for superior filtration performance.
      • Optimized Flow Dynamics: Streamlined design minimizes pressure drop and maintains optimal oil circulation rates.
      • Minimized Downtime: High-flow design enables rapid filtration of transformer oil, completing quickly with minimal disruption to operations.
      • Reduced Maintenance Frequency: Requires less frequent maintenance compared to traditional filtration methods, saving time and resources.
      • Compatibility with Varied Oil Types: Compatible with a wide range of transformer oil types, offering flexibility in filtration applications.
      • Environmental Sustainability: Promotes environmental responsibility by minimizing waste and energy consumption during the filtration process.

Before a new transformer or electrical system is put into active service, it undergoes a series of pre-commissioning tests to ensure that it functions as intended and meets safety and performance standards. These tests are critical in identifying potential issues and ensuring the reliability and efficiency of the equipment. Here's an elaboration on the key aspects.

  1. Inspection and Verification:
    • A thorough visual inspection is conducted to verify that all components are installed correctly and in accordance with design specifications.
    • Detailed checks are performed on wiring, connections, and insulation to ensure compliance with safety standards.
  2. Functional Testing:
    • Functional tests are carried out to validate the operational capabilities of the transformer and associated electrical systems.
    • This includes testing the functionality of control systems, protective relays, and other critical components to ensure they respond appropriately to various scenarios.
  3. Load Testing:
    • Load testing is conducted to assess how the transformer and electrical systems perform under actual operating conditions.
    • It involves applying a simulated load to the system to evaluate its capacity, stability, and response to varying demand levels.
  4. Insulation Resistance Tests:
    • Insulation resistance tests are performed to ensure that the insulation materials are effective in preventing leakage currents and maintaining the integrity of the electrical system.
    • These tests help identify any weaknesses in insulation that could lead to electrical faults.
  5. Dielectric Strength Tests:
    • Dielectric strength tests assess the ability of the transformer and electrical systems to withstand high voltage without breaking down.
    • This is crucial for ensuring the equipment can handle voltage fluctuations and surges without compromising safety or performance.
  6. Oil Quality and Analysis:
    • If the transformer contains oil, its quality is assessed through comprehensive analysis.
    • This includes testing for moisture content, dissolved gases, and other impurities that could impact the transformer's performance.
  7. Documentation and Reporting:
    • Detailed documentation is maintained throughout the pre-commissioning tests, including test procedures, results, and any corrective actions taken.
    • A comprehensive report is generated to provide a clear overview of the equipment's condition and compliance with standards.

Pre-commissioning tests play a crucial role in ensuring that transformers and electrical systems are ready for deployment, helping to mitigate potential risks and ensuring long-term reliability and safety in operation.


High Voltage Testing is a critical phase in the lifecycle of transformers and other high-tension electrical equipment. This rigorous testing process involves subjecting the equipment to elevated voltage levels to assess its insulation strength, dielectric properties, and overall performance under extreme conditions. Here's a detailed explanation of the key elements involved.

  1. Dielectric Strength Evaluation:
    • High Voltage Testing primarily focuses on evaluating the dielectric strength of the transformer and other HT equipment.
    • The dielectric strength is the ability of the insulation materials to withstand high voltage without breaking down, ensuring the safe operation of the equipment.
  2. Insulation Integrity Assessment:
    • The test assesses the integrity of insulation systems, identifying any weaknesses. This is crucial for preventing insulation failure, which could result in equipment damage or operational issues.
  3. Voltage Endurance Testing:
    • The equipment is subjected to voltages higher than its rated operational levels, simulating extreme conditions and ensuring its ability to withstand transient voltage spikes.
  4. Partial Discharge Detection:
    • High Voltage Testing includes monitoring for partial discharges, which are localized breakdowns in insulation that can occur at high voltages.
    • Detecting and measuring partial discharges helps identify potential insulation issues before they escalate.
  5. Induced Overvoltage Testing:
    • Induced overvoltage tests simulate conditions where the equipment is exposed to voltage surges or transient disturbances, evaluating its response and protective mechanisms.
  6. Insulation Resistance Measurement:
    • Insulation resistance is measured to ensure that the insulation material effectively resists leakage currents, preventing electrical leakage and maintaining the integrity of the equipment.
  7. Temperature Rise Evaluation:
    • High Voltage Testing may include assessing the temperature rise of critical components during high-voltage conditions.
    • This helps ensure that the equipment can dissipate heat effectively and operate within specified temperature limits.
  8. Compliance with Standards:
    • The testing procedures adhere to industry standards and regulatory requirements, ensuring that the equipment meets safety and performance benchmarks.

High Voltage Testing is an integral part of ensuring the reliability, safety, and performance of transformers and other HT equipment, helping to identify potential issues and mitigate risks associated with high-voltage operation.


The servicing of circuit breakers and switchgears is a comprehensive approach aimed at maintaining the optimal performance, reliability, and safety of these crucial components within electrical systems. This specialized service involves a series of tasks that address various aspects of circuit breaker and switchgear functionality.

  1. Visual Inspection:
    • A meticulous visual inspection is conducted to assess the overall condition of circuit breakers and switchgears.
    • This includes checking for signs of wear, corrosion, loose connections, or any physical damage that may impact performance.
  2. Functional Testing:
    • Functional tests are performed to ensure that circuit breakers operate correctly during various electrical fault conditions.
    • This phase assesses the responsiveness of the equipment, verifying its ability to interrupt and isolate electrical circuits when necessary.
  3. Contact Resistance Checks:
    • Circuit breakers and switchgears rely on effective contacts for proper operation. Contact resistance checks are conducted to identify any degradation in these critical components.
    • Adjustments or replacements are made as needed to maintain optimal electrical conductivity.
  4. Insulation Resistance Measurement:
    • The insulation resistance of circuit breakers and switchgears is measured to ensure that insulation materials effectively prevent leakage currents, avoiding electrical leakage and maintaining safety.
  5. Lubrication and Mechanical Checks:
    • Lubrication of moving parts is crucial for the smooth operation of circuit breakers and switchgears.
    • Mechanical checks are performed to identify any friction, misalignment, or wear in mechanical components, with necessary lubrication or adjustments carried out as required.
  6. Secondary Injection Testing:
    • Secondary injection testing is conducted to validate the functionality of protective relays associated with circuit breakers and switchgears.
    • This ensures that the protection mechanisms respond accurately to fault conditions, enhancing overall system reliability.
  7. Cleaning and Debris Removal:
    • Cleaning procedures are implemented to remove dust, debris, and contaminants that may accumulate within circuit breakers and switchgears.
    • Clean equipment promotes efficient operation and reduces the risk of faults caused by foreign materials.
  8. Tightening and Torque Verification:
    • All connections and fasteners are checked for proper tightening and torque to prevent issues related to loose connections, which can lead to overheating and electrical failures.

By encompassing these tasks, the servicing of circuit breakers and switchgears ensures that these critical components operate efficiently, contribute to the overall reliability of the electrical system, and adhere to safety standards.


Our Centrifuging service is a precision-driven process tailored to enhance the quality and performance of diverse mineral oils used in transformers and highvoltage equipment. This specialized procedure is designed to purify the oils, effectively removing impurities, contaminants, and water. The key elements of our Centrifuging service include

  1. Impurity Removal:
    • Through centrifugation, solid impurities such as particles, sludge, and oxidation by-products are meticulously separated from the mineral oil.
    • This meticulous impurity removal enhances the overall cleanliness and purity of the oil.
  2. Water Extraction:
    • Our Centrifuging process plays a pivotal role in extracting water content from the mineral oil.
    • The removal of water is crucial for preventing issues such as reduced dielectric strength and the formation of harmful acids in the oil.
  3. Enhanced Dielectric Strength:
    • Purifying the mineral oil through centrifugation contributes significantly to improving its dielectric strength.
    • This enhancement is fundamental for maintaining the insulation properties of transformers and other electrical equipment, preventing electrical breakdowns.
  4. Extended Equipment Lifespan:
    • By systematically removing impurities and water from mineral oils, our Centrifuging service aids in mitigating factors contributing to equipment degradation.
    • This proactive approach results in an extended lifespan for transformers and other high-voltage equipment, reducing the need for premature replacements and associated costs.
  5. Customized Centrifuging Solutions:
    • Our Centrifuging services are tailored to meet the unique requirements of different mineral oils.
    • Customized solutions are applied based on the specific characteristics of the oil, ensuring optimal purification without compromising its integrity.
  6. Oil Quality Assessment:
    • Following the centrifugation process, an assessment of the mineral oil's quality is conducted through various tests.
    • These assessments include measurements of key parameters such as moisture content, impurity levels, and dielectric strength, ensuring the oil meets or exceeds industry standards.

Our Centrifuging of All Types of Mineral Oils is a critical step in the maintenance and optimization of transformers and high-voltage equipment. It ensures that the insulating oil remains at its peak performance, contributing significantly to the overall reliability and longevity of your electrical infrastructure.

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