At On Load Gears, our ABS-series oil-type on-load tap changers (OLTCs) exemplify the highest standards of design, quality, and adaptability. Engineered to meet the rigorous demands of modern power transformers, these OLTCs support voltage regulation, grid stability, and transformer life extension.
Overview of ABS-Series OLTCs
- ABS 11 – Optimally designed for 11 kV transformer systems
- (A)ABS 11 – Advanced-version of ABS 11 with enhanced tap control precision
- ABS 33 – Developed for 33 kV intermediate-class installations
- ABS 66 – Suitable for 66 kV systems, balancing size and performance
- ABS 132 – High-voltage solution for up to 132 kV transformer regulation onloadgears.com
Each variant is designed with flange mounting for seamless integration into transformer tank walls, and they include robust positioning mechanisms for precise tap changes.
Key Technical Features
1. Voltage Class Coverage & Tap Range
The ABS-series addresses a wide voltage spectrum—from 11 kV to 132 kV—making it ideal for applications in power generation, bulk transmission, and large industrial installations.
2. Oil-Type Construction
Oil-immersed switching devices offer superior dielectric strength and heat dissipation. This design reduces contact wear and ensures arc quenching during tap operations.
3. Flange Mounting Configuration
Flange-mounted for direct integration into transformer tanks, the OLTCs eliminate external conduits and reduce oil leakage risks.
4. Mechanical Alignment & Durability
Precisely machined gear drives paired with feedback indicators guarantee accurate and reliable tap positioning. The oil-filled environment further extends the mechanical endurance of moving parts.
Quality and Manufacturing Process
In-House Engineering & R&D
Development of ABS models is driven by internal R&D resources using theoretical and simulation tools (e.g. FEA, thermal, mechanical stress analysis) to confirm design integrity from 11 kV to 132 kV.
- High-grade contact assemblies and linkages are used to ensure consistent conductivity and low arcing.
- Seals and bushings are selected for oil compatibility, high voltage insulation, and durability.
- Gaskets and flanges meet API/ANSI pressure standards for oil containment.
- Precision jigs and fixtures guide assembly of oil tanks, drives, contacts, and actuators.
- Alignment gauges and torque measurement ensure accuracy for tapped shafts and flange fittings.
Testing Protocols
- Each OLTC undergoes comprehensive quality tests, including:
- Dielectric / high-voltage withstand testing to verify insulation strength
- Switching cycle tests (e.g. 10,000 cycles) to validate long-term mechanical reliability
- Oil tightness and pressure testing to prevent leaks and ensure operational safety
Customized Factory & Site Testing
Factory Acceptance Tests (FATs) are conducted per IEC and IS standards, with customized test records available. Site Acceptance Tests (SATs) are supported during transformer installation.
Target Applications
Power transmission substations – Precise voltage regulation under varying load conditions
Utility transformer grids – Ensuring stable distribution in urban and rural networks
Large industrial transformers – Optimizing voltage levels in steel plants, refineries, and manufacturing units
Renewable energy systems – Enabling adaptable transformer control for wind and solar farms
Why Choose ABS-Series OLTCs by On Load Gears?
- Broad voltage range: From 11 kV to 132 kV with multiple models
- Robust mechanical design: Durable contact systems and drive trains tested for high cycle endurance
- Oil-based insulation: Superior arc suppression and heat dissipation
- Precision mountability: Flange-type designs tailored for seamless transformer integration
- In-house testing: Quality certified via high-voltage, mechanical, and leakage assessments
Final Thoughts
The ABS-series OLTCs by On Load Gears embody engineering excellence—balancing high-voltage performance, mechanical resilience, and installation flexibility. This range empowers transformer manufacturers, EPC contractors, utilities, and OEMs with reliable tools for voltage regulation and grid management.
Explore detailed technical data Sheets and request a quote at
https://onloadgears.com/types/abs-model-oltcs-up-to-132-kv-class/