Voltage class
01Up to 36 kV
Indoor resin cast construction
Indoor Instrument Transformers
Resin CastPotential Transformers
INDULF manufactures indoor resin cast potential transformers up to 36 kV for metering, protection and voltage measurement applications. Manufactured using APG casting and high-grade hydrophobic epoxy resin, each transformer is built for consistent electrical performance, reliable insulation and dependable service in indoor power systems.
Voltage class
Up to 36 kV
Process
APG cast
Resin cast PT configurations
Configured for the way voltage is measured
From metering and protection to specialized voltage-transformation configurations, our resin cast PTs are manufactured to suit the electrical and installation requirements of each application.
Metering PTMetering PTHigh-accuracy 0.2 / 0.5 cores for revenue, boundary, and feeder metering points.Protection PTProtection PT3P protection cores for voltage-dependent and directional protection schemes.Single-phase PTSingle-phase PTA single-phase unit for a phase-to-phase or phase-to-earth voltage point on the metering or protection scheme.Three-phase PTThree-phase PTA three-phase unit for panel positions where all three line voltages are measured from a single housing.Residual-voltage (open-delta) PTResidual-voltage (open-delta) PTA three-unit open-delta set with a residual winding, for earth-fault and directional-earth-fault protection.Overview
Performance that starts with how we build
INDULF manufactures indoor resin cast potential transformers up to 36 kV for metering, protection and control applications across medium-voltage power systems. Each transformer is developed around the requirements of the application, with the required voltage ratio, accuracy, burden, insulation level and system configuration built into the finished unit.
Manufactured using Automatic Pressure Gelation (APG) technology and high-grade hydrophobic epoxy resin, each transformer is cast to create a dense and reliable insulation system. The resin construction provides high dielectric strength, strong resistance to moisture and surface tracking, and long-term dimensional stability for dependable performance in indoor switchgear, substations and industrial power systems.
Quality is embedded throughout our manufacturing process, from material and component inspection through winding, casting, assembly and final testing. Every transformer undergoes defined routine testing before dispatch, supported by serial-number-specific documentation for verification and traceability. With products successfully delivered across India and international markets, INDULF continues to meet evolving industry requirements through dependable manufacturing, consistent quality and project-ready execution.
Technical capability
Built around your application requirements
Key electrical, accuracy, insulation and construction parameters across our resin cast potential transformer range.
Primary voltage
0211 / 22 / 33 kV
Application-specific voltage ratios
Secondary voltage
03110 V / 110/√3 V / 110/3 V
Configured to the measurement arrangement
Rated burden
04Up to 200 VA
Configured to the application
Accuracy class
050.2 / 0.5 / 3P / 5P
Metering and protection classes
Construction
06APG Cast Resin
High-grade hydrophobic epoxy insulation
Why INDULF
From manufacturing to final testing, we control the process
Every INDULF transformer reflects controlled manufacturing, rigorous testing and a commitment to consistent quality and dependable performance.
- 01
CONTROLLED MANUFACTURING
Our instrument transformers are manufactured with controlled processes for winding, insulation, assembly and finishing, maintaining consistency from production through final inspection.
- 02
APPLICATION-LED ENGINEERING
Each transformer is configured around the required ratio, accuracy class, burden, insulation level and core arrangement for its intended protection or metering application.
- 03
IN-HOUSE TESTING
Every transformer is subjected to defined routine checks before dispatch through our in-house NABL-accredited testing facility.
- 04
QUALITY AT EVERY STAGE
Quality is maintained through defined inspection and control processes across materials, manufacturing, assembly and final inspection.
Applications
Where our PTs deliver value
UTILITY & DISCOM METERING
Revenue, boundary and feeder metering across utility distribution substations.
INDUSTRIAL SWITCHGEAR
Protection and metering applications within factory, plant and industrial HT switchboards.
EPC & SWITCHYARD PROJECTS
Application-specific PTs supplied for contractor-led switchyard, substation and infrastructure projects.
FEEDER & EARTH-FAULT PROTECTION
Protection-class and residual-voltage (open-delta) PTs for feeder protection and earth-fault detection systems.
Find the right instrument transformer
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Voltage sideOutdoor Potential TransformersExplore
IndoorResin Cast Current TransformersExploreCombined unitCT-PT Metering UnitExploreExplore More from INDULF
Next step
Let's build the right PT for your application
Share your project requirement, specification or drawing with our team. We'll review the application, confirm the right configuration and take it through manufacturing, testing and delivery.
01
SHARE YOUR REQUIREMENT
Send your specification, drawing, project details or existing transformer details.
02
TECHNICAL REVIEW
Our team reviews the application and confirms the appropriate transformer configuration and requirements.
03
BUILT, TESTED & DELIVERED
Your transformer is manufactured, tested and prepared with the required quality and technical documentation for delivery.