Megger MTO300 Transformer Ohmmeter Repair

$245.00

🛡️ 90-Day Warranty ✓ Fee Credited to Repair ⚡ No Forms Needed

Restore your Megger MTO300 to factory specifications with June Company’s certified repair service. Common issues include ratio measurement accuracy drift and excitation current source degradation.

Helpful Resources

📋 How It Works

Submit Request – Pay evaluation fee & provide equipment details
Ship to Us – Send your equipment to our Oregon facility
We Evaluate – Detailed diagnosis & repair estimate
Fee Credited – Your evaluation fee applies to repair cost
We Repair – Professional repair with 90-day warranty

🔧 Fast Turnaround: Most repairs are completed within 1–3 business days.
📏 Precision Calibration: NIST-traceable calibrations included for most repairs.
🛡️ Warranty: 90-day warranty on all repairs.
📝 Transparency: Detailed evaluation and repair estimate before work begins.

✓ Evaluation Fee Credited Toward Repair

This evaluation fee is applied as credit toward your final repair cost. After we evaluate your equipment, you'll receive a detailed estimate before any repair work begins.

Description
Brand

Description

Megger MTO300 Transformer Ohmmeter Repair

The MTO300 is a transformer ohmmeter — it sources DC test current to measure winding resistance on power-transformer windings and tap changers, the test that catches loose connections, broken strands, and tap-changer problems. Its character is high-current DC measurement, so the faults concentrate in the current source and the precision low-resistance measurement path.

June Company repairs and calibrates the MTO300 for transformer maintenance crews and substation testing teams.

Common MTO300 problems we fix

Won’t reach rated test current — high-current DC source degradation, the most common MTO fault; without full current, winding-resistance readings are slow and unstable. Rebuilt to source full current.
Resistance readings drift or won’t settle — measurement-circuit drift on the low-resistance path, recalibrated for stable readings.
Tap-changer test sequencing issues — the control that steps through tap positions, repaired.
Demagnetization not working — the demag function that conditions the core after testing.
Display or interface faults.

FAQs

My winding-resistance readings won’t stabilize — why? Usually the current source can’t reach or hold rated current, so the reading never settles. We rebuild the source and recalibrate so readings are stable and accurate.

Do you certify the resistance accuracy? Yes — verified against our reference standards with a NIST-traceable certificate.

Every repair includes NIST-traceable calibration and a 90-day parts-and-labor warranty. Email us or submit a service request.

Brand

Megger Repair

Megger Group Limited is a company known for manufacturing electrical test equipment and measuring instruments. They provide a wide range of products designed for testing, diagnosing, and maintaining electrical assets and systems. Some of their key products and their functionalities include:

Insulation Resistance Testers: Used to measure the insulation resistance of electrical equipment and components to ensure they can safely withstand normal operating voltages.
Low Resistance Ohmmeters: Instruments designed to measure very low resistances in electrical connections, cables, and conductors, helping to identify and troubleshoot high-resistance joints or faults.
Transformer Test Equipment: Includes testers for assessing the condition of transformers through various tests such as turns ratio, winding resistance, insulation resistance, and transformer oil testing.
Cable Fault Locators: Devices used to locate faults and defects in underground cables, helping to pinpoint the exact location of faults without the need for extensive excavation.
Ground Resistance Testers: Instruments used to measure the resistance of grounding systems to ensure electrical safety and compliance with standards.
Power Quality Analyzers: Instruments that monitor and analyze various aspects of electrical power quality, including voltage fluctuations, harmonics, power factor, and waveform distortions.
Portable Appliance Testers (PAT Testers): Used for testing the electrical safety of portable appliances and equipment to ensure they comply with safety regulations and standards.
Circuit Breaker Analyzers: Devices designed to test and analyze the performance of circuit breakers, including timing, operation sequence, and contact resistance.

Megger products cater to a wide range of industries including power generation, transmission, distribution, telecommunications, manufacturing, and electrical contracting. They are essential tools for electrical engineers, technicians, and maintenance professionals to ensure the reliability, safety, and efficiency of electrical systems and equipment.