EI Repair Services India
EI (Electricals India) is a pioneering manufacturer of power transformers, distribution transformers, and allied electrical equipment established in 1934. Based in India, EI has earned recognition across domestic and South Asian markets for robust, reliable transformer solutions serving power utilities, industrial plants, and infrastructure projects. Their equipment operates in demanding environments from renewable energy stations to steel mills.
EI (Electricals India) is a pioneering manufacturer of power transformers, distribution transformers, and allied electrical equipment established in 1934. Based in India, EI has earned recognition across domestic and South Asian markets for robust, reliable transformer solutions serving power utilities, industrial plants, and infrastructure projects. Their equipment operates in demanding environments from renewable energy stations to steel mills.
Synchronics Electronics specializes in repairing EI transformers, voltage regulators, and control electronics. With 180+ engineers and three decades of experience, we diagnose and restore EI equipment including core faults, winding failures, tap-changer malfunctions, and oil-cooled unit issues. Our Vadodara facility handles field testing, thermal imaging, and oil analysis—critical for transformer health assessment and compliance.
Certified EI transformer repair with on-site thermal diagnostics and oil testing capability.
EI Product Lines We Repair
Our engineers are trained on the full EI product range. Below are the major product families we service.
Distribution Transformers (11kV–33kV)
EI's core product line for power distribution networks. Common failures include winding insulation breakdown, tap-changer contacts carbonization, and oil degradation. Repair requires precise winding rewinding and dielectric strength restoration.
Power Transformers (High-Voltage Range)
Large-capacity transformers for substations and industrial power supply. Typical issues: bushing failure, internal faults detected by dissolved gas analysis (DGA), and cooling system leaks requiring comprehensive rebuild.
Step-Down Control Transformers
Low-voltage transformers used in industrial control panels and automation circuits. Common faults include primary-secondary short circuits, loose core bolts causing vibration, and winding insulation fatigue under thermal cycling.
Rectifier Transformers
Specialized units for DC power supplies and electroplating applications. Prone to harmonics-induced heating, tap-changer arcing under DC loads, and core saturation leading to efficiency loss.
Oil-Cooled Voltage Regulators
On-load tap changers (OLTC) and voltage stabilizers for maintaining grid stability. Failures occur from tap-changer motor burnout, selector switch contamination, and oil circulation blockage in aging units.
Why Choose Synchronics for EI Repairs?
PCB-Level Expertise
We repair down to the component level — not just swap boards. Our engineers identify root causes, replace failed IGBTs, capacitors, processors, and gate drivers on EI equipment.
Fast Turnaround
Standard 7–10 working days. Express 3–5 days available for critical breakdowns. Emergency same-day/next-day service for unplanned downtime.
6-Month Warranty
Every repaired unit ships with a 6-month comprehensive warranty on parts and labour. Our repair success rate is over 94% across all brands.
All-India Service
Couriered repairs accepted from any city in India. Doorstep pickup available in Vadodara, Mumbai, Pune, Ahmedabad, Surat, Chennai, and more.
Common EI Equipment Faults We Fix
Based on 30+ years of repair data, these are the most frequent failure modes we see in EI equipment arriving at our workshop.
- ✓Winding insulation breakdown (short circuit) — EI transformer windings degrade under prolonged overload, moisture ingress from damaged conservator seals, or sustained overvoltage spikes from grid transients. This is especially common in monsoon-prone Indian industrial areas where moisture infiltration is high.
- ✓On-load tap changer (OLTC) selector arm jam — EI OLTC units accumulate carbon deposits and metal particles from contact arcing over years of continuous duty. Selector arm contact surfaces oxidize and fuse under load switching, preventing smooth mechanical transition between tap positions.
- ✓Core lamination inter-laminar short — EI transformer core laminations lose insulation coating due to age, moisture, and acidic oil. Stray eddy currents develop between laminations, causing excessive core heating, increased iron losses, and eventual core damage visible through vibration and noise.
- ✓Bushing oil level low / porcelain cracking — EI transformer bushings are exposed to UV radiation and thermal cycling. Oil seeps from gasket deterioration, and porcelain insulation develops stress cracks that accelerate moisture ingress and surface leakage current, risking flashover during high-voltage transients.
- ✓Cooling radiator fins clogged / fan motor failure — In Indian industrial environments with high dust and pollution, EI radiator fins accumulate cotton lint, coal dust, and air particulates, reducing heat dissipation. Fan motors fail due to bearing wear, capacitor degradation, or winding insulation breakdown from moisture.
- ✓Dissolved gas analysis (DGA) abnormal values / oil oxidation — EI transformer mineral oil ages under thermal stress, especially in tropical climates where ambient temperatures exceed 40°C regularly. Dissolved gases (H2, CH4, C2H4, C2H6) indicate internal faults—overheating, arcing, or partial discharge—and advanced oxidation increases acid number, reducing dielectric strength.
How We Repair Your EI Unit
Receive & Log
Your unit is logged into our tracking system with a unique job number. You receive WhatsApp / email updates at every stage.
Fault Diagnosis
Board-level diagnosis using oscilloscopes, LCR meters, and thermal cameras. Root cause identified before any repair begins.
Component Repair
Faulty ICs, capacitors, MOSFETs, IGBTs, and gate drivers replaced with genuine or equivalent-spec components.
Full-Load Test
Unit tested under rated load with original or equivalent motor. All parameters verified. 6-month warranty issued.
Industries Using EI Equipment
We serve plant maintenance teams across all major industries where EI automation is deployed.
Frequently Asked Questions — EI Repairs
Do you repair EI transformers anywhere in India?+
Yes. Synchronics repairs the complete EI transformer range—distribution, power, rectifier, and voltage regulator units. We offer PAN-India door pickup from Mumbai, Delhi, Pune, Chennai, Hyderabad, Ahmedabad, Kolkata, and all other industrial cities. Our main repair facility is in Vadodara, Gujarat, equipped with on-site DGA testing, thermal imaging, and 500kVA test transformers for load testing.
How do I know if my EI transformer needs repair?+
Warning signs include unusual humming or buzzing noise, oil seepage from conservator or gaskets, temperature rise above rated 55°C rise limit, and irregular tap-changer operation (stuck positions, clicking noise). Synchronics recommends annual DGA oil testing and visual inspection. If dissolved gases exceed Duval Triangle limits or acid number exceeds 0.5mg KOH/g, repair is urgent. Contact us for emergency on-site assessment.
What is your turnaround time for EI transformer repair?+
Typical small-to-medium transformers (100–250kVA) take 15–20 working days including winding repair, core treatment, oil analysis, and full-load testing. Large power transformers (2–25MVA) may take 25–35 days. For emergency repairs, Synchronics offers fast-track service with dedicated technicians. Oil regeneration alone takes 5–7 days. We provide daily progress updates and video inspection reports.
Can you repair EI OLTC (on-load tap changers) without replacing the entire transformer?+
Yes. Synchronics specializes in in-situ and bench OLTC repair. We can disassemble, clean, replace selector contacts, and reassemble the tap-changer on-site or in our workshop. This typically costs 30–40% less than full transformer replacement. After repair, we perform 50+ no-load and load-switching test cycles to verify reliability. However, if internal core damage is detected via DGA, transformer overhaul is recommended.
Do you offer transformer oil testing and regeneration?+
Yes. Synchronics performs comprehensive oil analysis including dissolved gas analysis (DGA), acid number (TAN), moisture content, dielectric breakdown (BDV), and viscosity testing per ASTM/IEC standards. If oil is salvageable (DGA gases low, TAN < 0.5), we regenerate it through vacuum dehydration and acid neutralization, reducing cost by 60%. Otherwise, we supply and fill premium mineral or eco-friendly biodegradable oils.
What warranty do you provide on EI transformer repairs?+
Synchronics offers 12 months comprehensive warranty on all winding repairs, tap-changer overhauls, and electrical work. Parts replaced (bushings, radiator cores, fans, gaskets) carry manufacturer warranty. We also provide 6-month DGA re-testing at no charge to confirm internal condition stability. Extended warranty options available for critical installations.
How do I send my EI unit for repair?+
Pack the unit securely and courier it to our Vadodara workshop. Include a note with the fault description and your contact details. We will log it into our system and WhatsApp you a job number within 24 hours of receipt. Doorstep pickup is available in Vadodara, Ahmedabad, Surat, Mumbai, and Pune.
What is the cost of repairing a EI drive or PLC?+
Repair cost depends on the model and the fault. We offer a free diagnosis — once we identify the fault, we provide a fixed quotation before proceeding. Typical repairs cost 20–40% of the new unit price. We will never repair without your approval.
What warranty do you provide on EI repairs?+
All repaired units carry a 6-month comprehensive warranty covering the same fault and related issues. If the fault recurs within the warranty period, we repair it free of cost.
Do you provide a no-fix, no-fee guarantee?+
Yes. If we cannot repair your EI unit after diagnosis, you pay only the diagnosis fee (₹500–₹1,500 depending on the product). The unit is returned to you at no additional charge.
EI Repair Catalog
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Don't See Your EI Model Listed?
We repair the full range of EI industrial electronics — even if the specific model is not yet in our catalog. Send us the unit details and we'll confirm repairability within 24 hours.
Free evaluation • 6-month warranty • PAN India pickup
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Back in Action — Fast
Send us your faulty industrial electronics. Our engineers will diagnose it and provide a detailed quote within 24 hours — with no obligation to proceed.
Free Evaluation
No obligation
48hr Turnaround
Fastest in India
6-Month Warranty
Every repair
No Fix, No Charge
Zero risk policy
Pan-India Pickup
Doorstep service