IEC Accredited Transformer Lab Testing

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Transformers power industries, grids, and critical infrastructures, and their reliability depends on precise, standards-driven evaluation. At TAQQA AL JOHAD, we deliver transformer testing services that strictly follow IEC-approved procedures, ensuring every result is accurate, traceable, and trusted across the power sector.

Our testing environment is built around advanced diagnostic technology, controlled laboratory conditions, and expert engineers who understand transformer behavior down to the smallest detail. From early fault detection to performance benchmarking, TAQQA AL JOHAD helps clients maintain operational continuity, reduce risks, and extend the life of their assets with confidence.

TAQA AL JOHAD is an independent company that provides professional local third-party inspection, testing, certification, and calibration. This state-of-the-art facility plays a pivotal role in ensuring the highest quality, reliability, and performance of transformers.

Transformer Oil Testing Services

ELECTRICAL & INSULATION TESTS

Breakdown Voltage (IEC 60156)
Dissipation Factor (IEC 60247)
Resistivity @ 90°C (IEC 60247)
Power Factor @ 25°C (ASTM D924)
Power Factor @ 100°C (ASTM D924)

MOISTURE & PHYSICAL PROPERTIES

Water Content (IEC 60814)
Density @ RT (ASTM D4502)
Viscosity @ 40°C (ASTM D445)
Viscosity @ 100°C (ASTM D445)
Viscosity Index (ASTM D445)
Flash Point (ASTM D3828)
Pour Point (ASTM D97)
Color (ASTM D1500)
Appearance (ASTM D1524)

CHEMICAL & OIL QUALITY TESTS

TAN / Acidity (IEC 60296)
Oxidation Stability (IEC 61125)
Total Sulfur (ASTM D4294)
Oil Quality Index Calculation
pH Value (ASTM 7946)
Antioxidant (BHT) (ASTM D4768)

DISSOLVED GAS & DIAGNOSTIC ANALYSIS

DGA (IEC 60567 / ASTM D3612C HS)
Furan (IEC 61198)
Degree of Polymerization Calculation
Paper Sample DP Value (IEC 60450)

CONTAMINATION & CORROSION TESTS

Particle Count NAS 1638
Sediment & Soluble Sludge (ASTM D1883)
Metals (ASTM D5185)
Polychlorinated Biphenyls (PCBs) (ASTM D4059)
Potentially Corrosive Sulfur (CCD) (IEC 62535)
Dibenzyl Disulfide (DBDS) (IEC 62697-1)
Corrosion Copper Strip Test (ASTM D1275b)

ADVANCED OIL CONDITION ANALYSIS

Carbon Types Composition (ASTM D2140 / IEC 60590)
Oil IR Spectra (ASTM D2668)
Oil Quality Index Calculation
Other Specialized Analysis as Required

Transformer Electrical Testing Services

Winding Insulation Resistance Test

Insulation diagnostic of transformer windings

DC Winding Resistance Test

Assessment of winding resistance and connection condition.

Transformer Turns Ratio Test & Vector Group

Verification of turns ratio and vector-group configuration.

Tan δ & Capacitance (C) of the Winding

Evaluation of winding insulation condition.

Tan δ & Capacitance (C) of 110 kV Bushing

Assessment of bushing insulation condition

Single-Phase Excitation Current Measurement

Measurement of excitation current characteristics.

Impedance Voltage Test at Reduced Current

Assessment of transformer impedance characteristics at
reduced test current

CT Test

Testing of current transformer performance.

Mechanical Protection Alarm & Trip Signal Checks

Measurement of excitation current characteristics.

Magnetic Balance Test

Assessment of magnetic balance across transformer phases.

SFRA & Comparison with Fingerprint

Comparison of frequency-response characteristics with the
transformer fingerprint.

Insulation Resistance of Core & Frame

Verification of core/frame insulation condition

Tap Changer Operational Check

Verification of tap changer operating functionality.

Transformer Control Panel Signal Testing

Testing of transformer control-panel signals.

Pressure Leakage Test

Verification of pressure integrity and leakage condition.

RTCC Panel with AVR Test & Commissioning

Testing and commissioning of the RTCC panel and AVR
system.

Our Expertise in Transformer Testing

Backed by years of industry experience, TAQQA AL JOHAD combines technical capability with deep sector knowledge to provide IEC-aligned transformer assessment. Our experts evaluate transformers under simulated real-world conditions, applying strict international methodologies to uncover hidden issues long before they impact your operations. Whether it’s routine quality checks, pre-commissioning validation, or health diagnostics for aging transformers, we follow a systematic, data-driven approach that guarantees dependable results and clear decision support. Our dedicated, experienced technical team performs for all types of tests in line with IEC.

IEC-Aligned Transformer Lab Testing Services

Transformer Oil Quality Assessment

Winding Resistance Measurement

Through precision micro-ohm measurements, we identify loose connections, shorted turns, or winding deformation often before symptoms appear in operation.

Transformer Turns Ratio Verification

An essential test to confirm proper voltage transformation and core performance. It detects winding faults, tap-changer issues, and potential imbalance.

Insulation Resistance & PI Testing

We check insulation performance using controlled current injection to detect moisture, aging, and insulation breakdown, critical for long-term reliability.

Sweep Frequency Response Analysis

A sensitive diagnostic tool used to reveal core displacement, winding movement, or structural changes inside the transformer. Often used after transportation, faults, or major maintenance.

Sweep Frequency Response Analysis

A sensitive diagnostic tool used to reveal core displacement, winding movement, or structural changes inside the transformer. Often used after transportation, faults, or major maintenance.

Dissolved Gas Analysis

By analyzing gas signatures in transformer oil, we can diagnose overheating, arcing, partial discharge, and developing internal faults with great accuracy, enabling predictive maintenance.

FAQs

Why are IEC standards important in transformer testing?

IEC standards ensure every test follows globally recognized procedures, producing accurate and comparable results for safe and efficient transformer operation

Do you provide certified test reports?

Yes. We deliver professionally formatted, detailed reports outlining results, interpretations, and recommended corrective actions.

What transformer sizes do you test?

We support distribution and power transformers across a wide range of voltage classes using approved testing methods.

How often should a transformer undergo lab testing?

Ideally, once a year, but high-load, mission-critical, or aging units may require more frequent assessments.

Professional rigor
Certified equipment,
Commitment and actionable insights.
IEC-aligned diagnostic
Highly skilled engineering
Industry-specific service delivery
Transparent reporting

At TAQQA AL JOHAD, we blend technical precision with industry-driven solutions to protect your equipment, reduce operational risk, and ensure sustained performance.

What You Can expect to Get From Us

Special tests for transformers are conducted in addition to routine tests, usually to assess specific performance characteristics, ensure compliance with customer requirements, or diagnose potential issues. These tests are not mandatory for all transformers but are often required for critical applications.

Lightning Impulse Test: Checks insulation against lightning surges.
Temperature Rise Test: Ensures the transformer operates safely under full load.
Short-Circuit Withstand Test: Tests the mechanical strength under fault conditions.
Switching Impulse Test: simulates switching transients in high-voltage transformers.
Zero-Sequence Impedance Test: Helps in system fault analysis and neutral grounding.
Capacitance & Tan Delta Test: Evaluates insulation condition.
Insulation Resistance Test: Checks insulation health.

These tests help verify the transformer’s design, safety, and operational performance. Let me know if you need more details on any specific test!

Routine tests for transformers are standard tests performed to verify the quality, performance, and safety of the transformer before it is put into operation. These tests ensure that the transformer meets design specifications and regulatory standards. Below are the key routine tests conducted on transformers:

1. Insulation resistance test (Megger test)

Measures the insulation resistance between windings and between windings and the ground.
Ensures proper insulation and detects any weaknesses.

2. Winding resistance test

Measures the resistance of transformer windings using a low-resistance ohmmeter.
Helps identify issues such as loose connections or damaged conductors.

3. Ratio Test (Turn ratio test)

Checks the voltage ratio of primary to secondary windings to ensure correct transformation.
Done using a turns ratio meter.

4. Polarity and Phase Relation Test

Ensures the correct polarity of windings and verifies phase displacement.
Important for parallel operation of transformers.

5. Short-Circuit Test (Impedance Test)

Determines the impedance voltage and short-circuit losses.
Helps in designing protective devices.

6. No-Load Loss and Current Test

Measures core losses and magnetizing current at rated voltage.
Ensures efficiency and core material quality.

7. Dielectric Tests (High Voltage Tests)

Separate Source Voltage Withstand Test: Applies a high voltage to check insulation strength.
Induced Overvoltage Test: Ensures winding insulation can withstand higher voltages.

8. Leakage Test (Oil Leakage Test)

Performed on oil-filled transformers to check for oil leaks in the tank and bushings.

9. Magnetic Balance Test

Checks the magnetic balance of a three-phase transformer to detect faults in the core or windings.

10. Functional Tests of Protection and Control Equipment

Verifies the proper operation of Buchholz relays, pressure relief devices, and temperature indicators.

These routine tests ensure the transformer operates reliably and safely in service. Let me know if you need more details on any specific test!

1. Lightning Impulse Test

Simulates the effect of lightning strikes by applying a high-voltage impulse to the transformer.
Ensures insulation can withstand sudden voltage surges.

2. Switching Impulse Test

Performed on high-voltage transformers (typically 400 kV and above).
Simulates voltage surges due to switching operations in the power system.

3. Temperature Rise Test

Determines the transformer’s ability to dissipate heat under full load conditions.
Helps verify the thermal stability of insulation and cooling systems.

4. Short-Circuit Test (Dynamic Ability Test)

Evaluates the mechanical strength of windings under sudden short-circuit conditions.
Ensures that windings can withstand high electromechanical forces.

5. Partial Discharge Test

Detects internal insulation defects by measuring partial discharge levels.
Ensures insulation integrity and helps prevent future failures.

6. Noise Level Test

Measures the sound levels generated by the transformer under load and no-load conditions.
Ensures compliance with noise regulations.

7. Harmonic Analysis of No-Load Current

Determines the harmonic content in the no-load current.
Helps assess the quality of core material and design.

8. Zero Sequence Impedance Test

Determines the impedance of a three-phase transformer under zero-sequence conditions.
Important for fault analysis and grounding system design.

9. Tank Pressure Test

Checks the mechanical strength of the transformer tank by applying internal pressure.
Ensures the tank can withstand pressure variations during operation.

10. Insulation Oil Tests

Conducted for oil-filled transformers to assess oil quality and insulation properties.
Includes Breakdown Voltage (BDV) Test, Moisture Content Test, DGA (Dissolved Gas Analysis), and Acidity Test.

11. Measurement of Stray Losses

Determines the losses occurring due to leakage flux outside the core and windings.
Helps improve efficiency and reduce unnecessary heating.

12. Overload Test

Simulates overload conditions to verify transformer performance under excessive load.
Ensures the transformer can handle short-term overloads safely.

Special tests are typically performed based on customer requirements, standards (IEC, IEEE, IS, etc.), and operational needs. Let me know if you need further details on any test!