General
Application
Environmental
Standards
52–230 kv power transformers are designed for medium to high-voltage electrical networks, offering reliable voltage regulation between transmission and distribution systems. engineered with precision, these transformers ensure efficient energy transfer with minimal losses, providing essential support for grid stability. they are built to withstand demanding operational environments, enhancing system performance, and contributing to sustainable energy distribution. with customizable configurations, they can be tailored to meet specific load demands, ensuring long-term reliability and efficient operation in various industrial and utility sectors.
In high-voltage networks, 52–230 kV transformers enable seamless integration of generation, transmission, and regional grids, stepping voltage up for long‑distance transfer or down for sub-transmission while maintaining system stability and efficiency. Installed at substations, they regulate power flow, support fault isolation, and balance loads to enhance reliability and minimize losses. These transformers underpin resilient grid operations and deliver consistent electricity supply from utilities to end-users.
Suitable for indoor and outdoor application.
Ambient temperature: -50°C ~ 40°C
Relative humidity: ≤90% (25°C)
Relative humidity: ambient air relative humidity should be below 93%.
Altitude: ≤ 1000m
Max wind speed: ≤ 35 m/s
Earthquake acceleration: horizontal acceleration ≤ 0.3g
Vertical acceleration ≤ 0.15g
Special conditions: customized products are available.
Ambient temperature: -50°C ~ 40°C
Relative humidity: ≤90% (25°C)
Relative humidity: ambient air relative humidity should be below 93%.
Altitude: ≤ 1000m
Max wind speed: ≤ 35 m/s
Earthquake acceleration: horizontal acceleration ≤ 0.3g
Vertical acceleration ≤ 0.15g
Special conditions: customized products are available.
IEEE C57.12.00 - General requirements for liquid-immersed transformers.
IEEE C57.12.10 - Electrical and mechanical characteristics for liquid-immersed transformers.
IEEE C57.12.90 - Test code for liquid-immersed transformers.
IEEE C57.119 - Thermal parameter determination for transformers.
IEC 60076-1 - General requirements for power transformers.
IEC 60076-2, 60076-3, 60076-5 - Temperature rise, insulation, and short-circuit performance standards.
IEEE C57.12.10 - Electrical and mechanical characteristics for liquid-immersed transformers.
IEEE C57.12.90 - Test code for liquid-immersed transformers.
IEEE C57.119 - Thermal parameter determination for transformers.
IEC 60076-1 - General requirements for power transformers.
IEC 60076-2, 60076-3, 60076-5 - Temperature rise, insulation, and short-circuit performance standards.
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Transformer Features
Our 52-230 kv power transformers combine superior efficiency, reduced energy losses, and exceptional reliability, ensuring optimal grid performance and long-term operational stability in diverse power applications.
Flexible Design - Well-matched to a Range of Applications.
Offers modular configurations, enabling tailored solutions for diverse applications, ensuring compatibility with various system requirements and operational conditions.
Space Saving – Effective, Flexible Layout
Designed with low-loss materials and optimized winding configurations to minimize energy consumption, contributing to significant reductions in long-term operational costs.
Laborsaving – Reduction of Manpower
Integrated cooling mechanisms, including oil circulation and external radiators, efficiently manage heat, preventing overheating and ensuring consistent performance under load.
Energy Saving – Reduced Operating Costs
Utilizes environmentally friendly oils and materials that reduce carbon footprint, ensuring compliance with sustainability standards while maintaining high operational efficiency.
High Reliability – Long-term, Trouble-free Operation
Equipped with advanced tap changers to precisely adjust voltage levels under varying loads, maintaining stable grid integration and enhancing power distribution efficiency.
Safe Design – Ensures Operator’s Safety
Incorporates robust safety features, such as pressure relief devices and fault protection systems, to safeguard operators and equipment during operation.
Minimal Maintenance – Reduced Maintenance Costs
Designed for durability and reliability with minimal wear, reducing the frequency and cost of maintenance interventions, thus lowering overall lifecycle expenses.
Why Choose Kerun Intelec
Choose us for precision-engineered transformers—superior efficiency, global certifications, 24/7 support, and tailored solutions. trusted durability, energy-saving innovation, ensuring optimal performance and longevity worldwide
Fast Lead Times
Our made-to-order production timelines are highly competitive and as low as 8 weeks from order to delivery.
Design Conformance
We maintain rigorous oversight to ensure every transformer adheres precisely to your exact specifications.
Comprehensive Warranty
We stand behind the longevity and reliability of our products with a robust warranty that covers both materials and workmanship.
Competitive Pricing
We deliver exceptional value so you receive top-tier, reliable, high-quality products without the premium price tag
Exceptional Quality
We implement strict quality control measures at every stage of production to ensure our products meet or exceed industry standards.
Dedicated Support
Our support team is always at your service.Offering expert guidance from initial inquiry through post-installation support.
Standard Feature
Frequency: 60 hertz
Hv bushing: dry-type bushings compliant with ieee standards
Winding temperature rise: 55°c
Lv bushing: porcelain insulated bushing compliant with ieee standards
Core: regular grain-oriented, mitered cruciform with step-lap construction
Drain and filter valves with a sampler
Coils: cylindrical construction; all copper windings, custom tempered per design requirements
Pressure relief valve
Insulating oil: mineral oil
Magnetic oil-level indicator
Tank made of mild steel with an optional flat or skid base
Dial-type oil temperature indicator
Tank with manholes, lifting lugs, jacking pad, and grounding pads
Dial-type winding temperature indicator
Exterior and interior polyurethane enamel, with ansi 70 gray exterior and white interior color
Dial-type sudden pressure relay
Radiators: detachable panel type with shut-off valves
Vacuum pressure gauge
Tap changer: specifiable oltc brand options available.
Diagrammatic nameplate: engraved stainless steel
Optional Features
Frequency: 50 Hertz
Average Winding Rise: 55°C or 55/65°C
LV windings: foil, disk, helical and layer
HV windings: multilayer, disk and shielded disk
Conductors: Al, Cu and CTC
Cooling: ONAN/ONAF, KNAN, KNAN/KNAF
Insulating Oil: Natural ester (FR3 Enviro Temp, RAPO, etc.)
Conservator: With or without rubber bag and double flange
Radiators: Galvanized or stainless-steel
Fans: Future fan wiring and control
Automatic Pressure Relief Device
Nitrogen Gas Fluid Preservation System
Gas Test Valve
Schrader Valve
Rapid Rise Relay
Neutral Terminations
Bushing Mounted Current Transformers
Fiber-optic Temperature Measurements
Line Dissolved Gas Monitor
On-line Monitoring System
Fire Prevention System (SERGI)
Electrostatic Shield
HV Lightning Arresters: Distribution Class, Intermediate Class, Station Class (Harmonic allowances up to k-20)
Seismic Designs: Zones 1-4
Controls Cabinet: NEMA 3R, 4, 4X (Customizable colors)
Other Moving Facilities: Wheels
Special/Low Sound Level Designs
Special Environment Designs Available
Design Drawings
Precision-engineered 52‑230kv power transformer drawings, optimized for seamless integration, modular components, easy maintenance, space-efficient design, and enhanced operational safety, ensuring robust performance in demanding applications.
110kV-30MVA-Power-Transformer-Drawing
161kV-56MVA-Power-Transformer-Drawing
Accessories Include
Main Oil Tank
Conservator Tank
Radiator
Cooling Fan
Oil Pump
On-Load Tap Changer
HV Bushing
Lv Bushing
Neutral Bushing
Bushing Current Transformer
Current Transformer
Surge Arrester
Buchholz Relay
Pressure Relief Device
Oil Level Indicator
Winding Temperature Indicator
Oil Temperature Indicator
Magnetic Oil Level Gauge
Oil Sampling Valve
Drain Valve
Liquid Level Gauge
Filter Valve
Earthing Terminal
Terminal Connector
Control Cabinet
Marshalling Box
Wheel
Nameplate
About Construction
Robust 52‑230kv transformer construction featuring high‑strength steel tank, precision wound core, advanced insulation system, integrated cooling channels to ensure long‑term reliability, efficiency, and performance.
01
Tanks
02
Conservator
03
Core
04
Coils
05
Transformer Active Part
06
Corrugated Radiator
Tanks
Power transformers feature a mild steel tank with high-precision robotic welding, ensuring structural integrity and durability. custom sizing supports unique structures and thicknesses to meet specific needs. tanks are equipped with manholes, lifting lugs, jacking pads, and grounding pads, with provisions for additional accessories. surface protection includes optional galvanizing and customizable electrostatic powder coating for enhanced durability, with flexible color choices to match environmental requirements.
Robotic Welding Ensures Consistent Seam Quality and Leak Tightness.
Electrostatic Coating System Tailored for Coastal or Industrial Atmospheres.
Conservator
The Power transformer Conservator is crafted from low-carbon steel with the same manufacturing process as the tank, ensuring durability and strength. It can be customized with capsule-type, diaphragm-type, or corrugated oil pillows according to technical requirements. This design increases load capacity and provides reliable oil volume management, ensuring consistent transformer performance while minimizing the risk of oil contamination and pressure buildup.
Customizable capsule, diaphragm, or corrugated oil pillows for efficient expansion.
Extended insulation lifespan through efficient oil expansion management.
Core
Power transformer cores use silicon steel or amorphous alloy to optimize magnetic performance and efficiency. Silicon steel offers proven low hysteresis and reliable magnetic flux handling for robust power applications. Amorphous alloys significantly reduce core losses, boosting energy efficiency and lowering operating costs. Custom core sizes and automated cutting/stacking processes enhance manufacturing precision and adaptability to specific design requirements.
Fully automatic transverse cutting line ensures precise lamination dimensions.
Automated stacking machine maintains consistent step-lap overlap and alignment.
Coils
Power transformers feature Specified insulation materials like DMD, Nomex®, or Weidmann for enhanced electrical performance and thermal stability. LV windings utilize foil, disk, helical, and layer designs for optimized current distribution and efficiency. HV windings include multilayer, disk, and shielded disk configurations, ensuring superior voltage handling and minimizing losses, improving overall transformer reliability and longevity.
Insulation materials: optional DMD, Nomex®, or Weidmann.
Precision wound coils enable reliable electrical performance and longevity
Transformer Active Part
Power transformer active parts integrate precision core and windings designed for low losses and minimal audible noise, enhancing efficiency and reliability. High magnetic flux density and robust dielectric strength improve energy transfer and electrical insulation. Enhanced impulse withstand capability protects against lightning and transient stress, while high‑strength mechanical clamps ensure impact resistance and long‑term stability in operation.
Rigid clamping frames minimize vibration, noise and mechanical deformation.
High magnetic flux density optimizes transformer performance and capacity.
Corrugated Radiator
Power transformer corrugated radiators are made from cold-rolled steel, offering excellent cooling performance and mechanical strength. Automated robotic welding ensures consistent weld seams for durability. Corrosion-resistant coatings match the tank's finish, enhancing long-term reliability. Customizable height and fin spacing improve cooling efficiency, while modular, detachable designs simplify installation and transport, offering flexibility and convenience.
Robot-welded seams improve leak tightness and dimensional consistency.
Modular design allows for easy transportation and installation.
About Accessories
Comprehensive transformer auxiliary solutions enhance operational monitoring, thermal management, safety control, and system integration while simplifying maintenance, improving responsiveness, resilient performance across high‑voltage network applications.
01
HV Bushings
02
LV Bushings
03
Tap changer
04
Cooling System
05
Oil Thermometer indicator
06
Winding Temperature Indicator
07
Oil level indicator
08
Buchholz relay
9
Pressure Relief Device (PRD)
10
Surge Arresters
11
Grounding
12
Transformer breather
13
Valve
14
Motor Drive Unit
15
Marshalling Box
16
Control Box
17
Wheel
18
Nameplate
HV Bushings
Power transformer HV bushings are designed to meet ieee standards with dry-type insulation for enhanced reliability. made from high-strength insulating materials, these bushings provide superior electrical performance and durability. optional elevated bushing mounts enhance impact resistance, while the sealing design ensures excellent moisture protection, offering robust, long-term operation and minimizing maintenance needs.
Dry-type bushings meet IEEE standards for improved reliability.
High-strength insulating materials ensure superior electrical performance.
LV Bushings
Power transformer LV bushings comply with IEEE standards and are available in porcelain insulated or dry-type designs. They are made with high-strength insulating materials, ensuring superior electrical and mechanical performance. Elevated mounting options enhance shock resistance and the sealing design provides reliable moisture protection, offering long-term durability and reducing maintenance needs for efficient operation.
Porcelain or dry-type insulation options for superior electrical performance.
Enhanced moisture sealing design ensures long-term operational reliability.
Tap changer
On-load tap changers (OLTCs) can be specified by preferred brands to match utility practices. Tin- or silver-plated contacts improve conductivity and help prevent oxidation, supporting stable resistance over time. Tap range and step size are engineered with the overall design to maintain voltage under load and reduce downstream equipment stress across changing network conditions.
Specifiable OLTC brand options align with utility standardization.
Motor-drive options support local, remote, or SCADA operation.
Cooling System
The cooling system in 52–230 kV power transformers ensures efficient heat dissipation, maintaining optimal operating temperatures under varying loads. It prevents overheating, which could lead to insulation degradation or equipment failure. The system is customizable, featuring air, oil, or hybrid cooling, and integrates advanced controls and sensors, enhancing reliability, reducing energy losses, and prolonging transformer lifespan.
Custom cooling capacities designed for specific transformer sizes.
Automated temperature monitoring optimizes cooling performance in real-time.
Oil Thermometer indicator
An oil thermometer indicator provides continuous top-oil temperature measurement to support safe loading decisions and early detection of abnormal heating. A sealed sensing element and robust dial assembly deliver stable readings under vibration and outdoor exposure. Optional alarm and trip contacts, plus remote outputs, integrate with protection and monitoring systems to reduce thermal aging risk, prevent insulation damage, and improve maintenance planning.
Clear dials with bold markings support quick, unambiguous visual checks.
Optional alarm contacts signal low oil conditions to SCADA.
Winding Temperature Indicator
A winding temperature indicator (WTI) estimates winding hottest-spot temperature using a thermal-replica system that combines top-oil sensing with load current influence. It drives cooling control and alarm/trip contacts to prevent overheating and accelerated insulation aging. A sealed, vibration-tolerant mechanism with optional analog/Modbus outputs supports SCADA integration, improving loading decisions, fault response, and condition-based maintenance across harsh outdoor environments and duty cycles.
Provides continuous temperature indication for quick, on-site condition assessment.
Adjustable set points for tailored protection thresholds.
Oil level indicator
An oil level indicator provides continuous visual and remote confirmation of insulating-fluid level in the main tank, conservator, or OLTC compartment. Magnetic float coupling keeps the mechanism hermetically sealed, reducing leakage risk and service needs. Optional alarm/trip contacts or analog outputs flag low-level conditions early, helping prevent insulation exposure, overheating, and unplanned outages while supporting condition-based maintenance across harsh environments.
High-visibility scales support quick checks during routine walkdowns.
Analog 4–20 mA output integrates with SCADA monitoring.
Buchholz relay
The Buchholz relay provides early fault detection in conservator-type oil transformers by sensing gas accumulation and sudden oil surge from internal arcing or insulation breakdown. Two-stage contacts deliver alarm and trip actions, limiting damage and outage impact. A sealed, inspection-friendly housing with test valve supports functional checks without draining oil, improving protection reliability and lifecycle maintenance planning under harsh conditions.
Two-stage alarm and trip contacts enable graded protection responses.
Both standard Buchholz and rapid-response pressure relay types available
Pressure Relief Device (PRD)
A main-tank pressure relief device for 52–230 kV power transformers vents rapid overpressure from internal faults or arcing, preventing tank rupture and limiting hot-oil expulsion. Spring-loaded or diaphragm mechanisms open at a calibrated setpoint, then reseal to maintain leak-tightness. Optional mechanical flags and alarm/trip contacts speed diagnosis and isolation, improving personnel safety and reducing outage duration and repair scope overall.
Fast venting reduces rupture risk during internal faults.
Resealing design maintains leak-tightness after pressure normalization.
Surge Arresters
Surge arresters are installed on both high-voltage and low-voltage sides of 52-230 kV power transformers to protect against transient overvoltages caused by lightning or switching events. These devices effectively divert excess energy to the ground, preventing damage to insulation and critical transformer components. Their integration improves system reliability, minimizes downtime, and extends the transformer's operational lifespan.
High and low-voltage options available for full system protection.
Customizable voltage ratings for specific transformer application requirements.
Grounding
Grounding in a 52–230 kV power transformer establishes a reliable earth reference for the main system, core and clamping structures, tank and components, surge arresters, and protection/measurement devices. It ensures effective fault current dissipation, minimizes touch and step potentials, enhances lightning protection, and stabilizes system voltage. Robust grounding improves safety, protects equipment, and reduces operational risk in high‑voltage environments.
Multiple grounding bar options support flexible system layouts.
Modular ground pads accommodate various transformer mounting configurations..
Transformer breather
The CT’s Junction Box for 52–230 kV power transformers houses current transformer secondary connections, providing secure, insulated wiring compartments. It prevents environmental damage, reduces signal interference, and supports easy maintenance. The box’s modular design allows customization for various voltage configurations, enhancing flexibility, reliability, and long-term system performance. It simplifies integration with metering and protection systems.
Single- or multi-chamber designs sized for different transformer capacities.
Sizing based on oil volume and breathing rate optimizes performance.
Valve
The valve system in a 52-230 kV power transformer includes butterfly valves for cooling system pipelines, gate valves for the main oil circuit, ball valves for protection and monitoring device connections, and needle valves for oil sampling points. These components enable precise control of fluid flow, enhance system reliability, support maintenance operations, and improve fault management.
Customizable valve sizes and configurations to match specific needs.
Easy-to-operate manual or automated options available for control.
Motor Drive Unit
The motor drive unit for 52-230 kV power transformers provides precise control of the on-load tap changer (OLTC) for voltage regulation. It automates the tap-changing process, improving efficiency and system stability. Designed for durability and low maintenance, it ensures smooth operation under various load conditions, reducing downtime, enhancing reliability, and supporting long-term operational performance with minimal manual intervention.
Integrated feedback mechanisms ensure precise voltage regulation.
Customizable communication protocols for SCADA system integration.
Marshalling Box
The Marshalling Box for 52–230 kV power transformers houses current transformer secondary connections, providing secure, insulated wiring compartments. It prevents environmental damage, reduces signal interference, and supports easy maintenance. The box’s modular design allows customization for various voltage configurations, enhancing flexibility, reliability, and long-term system performance. It simplifies integration with metering and protection systems.
Modular design allows easy integration with existing transformer systems.
Multiple entry/exit points streamline wiring and reduce installation time.
Control Box
A power transformer control box centralizes monitoring, protection, and automation circuits for temperature, oil level, pressure relays, tap changers, and alarms. It organizes control and signal wiring safely, improves operational visibility, and supports SCADA or local interface integration. Robust construction and clear labeling reduce commissioning time and maintenance errors, enhancing system reliability and simplifying diagnostics across substation environments.
Centralized wiring for easier inspection and maintenance.
Reliable signal integration for safer transformer operation.
Wheel
The wheel in a 52-230 kV power transformer aids in easy mobility for installation and transport. Its durable construction supports large, heavy transformers, minimizing handling risks. Corrosion-resistant materials ensure reliability in harsh environments. Additionally, customizable sizes and mounting options ensure compatibility with various transformer models, improving efficiency and reducing installation time.
Custom wheel sizes to accommodate various transformer weights.
Locking mechanisms ensure wheel stability during installation and operation.
Nameplate
A power transformer nameplate provides permanent, traceable identification and critical ratings for safe operation, commissioning, and maintenance. It lists voltage, kVA/MVA, impedance, cooling class, insulation levels, tap range, and wiring diagram references to support protection settings and field verification. Durable, corrosion-resistant marking maintains legibility in outdoor service, reducing errors, improving compliance documentation, and speeding troubleshooting throughout the transformer lifecycle.
Key ratings, impedance and losses consolidated for quick on-site reference.
Consistent plate design across models simplifies training and field operations.
About Oil-Filled
Designed for optimal cooling and insulation, our 52‑230 kV transformers utilize advanced oil technology, ensuring efficient heat dissipation, enhanced protection, and reliable performance throughout the transformer's lifecycle.
Mineral Oil
Low Transformer Cost
Good Cold Climate Performance
Good Dielectric Performance
Preventative Maintenance
Low Maintenance Cost
Potentialhigher Installation Cost
Good Heat Dissipation
Vaults Required for Indoor Installations Per Nec® Due to Low Fire Point
Silicone Fluid
Low heat release
Non-biodegradable
Reduced smoke
Not suitable for use with internal Bay-O-Net fuses
Low flame
Transformer cost
Self extinguishing
Disposal cost
Good dielectric performance
Viton gaskets required
Low toxicity
Retrofil applications
Moderate viscosity
High transformer cost
High stability
High moisture absorption
Envirotemp FR3
High fire point—360 °C
Transformer cost (lower than silicone fluid)
High flash point—330 °C
Pour point (–15 °C to –25 °C) transformer energized with full load with top oil temperature at –50 °C with no problems—no crystals formed at –68°C
Compatible with mineral oil
Allows transformers to be designed to operate at 10°C higher average winding rise (75°C) without reducing normal transformer insulation life
Excellent dielectric performance
Excellent switching medium
Greater than 99% biodegradable
Excellent cold weather performance
Greater tolerance to moisture, dramatically extending insulation life .
About Testing
Our 52‑230 kV transformers undergo rigorous testing, including electrical, thermal, and mechanical assessments, ensuring optimal performance, reliability, and compliance with international standards for safe and efficient operation.
Routine Tests
Type Tests
Special Tests
Voltage ratio + phase displacement / vector group
Short-circuit impedance + load losses
No-load losses + excitation current
Separate-source AC withstand (applied voltage)
Induced AC withstand (short-duration induced)
Tank tightness / leak test (liquid-immersed)
Temperature rise
Lightning impulse withstand
Switching impulse withstand (when specified)
Short-circuit withstand
Sound level
Induced voltage with partial discharge measurement (IVPD)
Partial discharge (PD) measurement
Capacitance
Dissipation factor (tan δ / power factor)
.Zero-sequence impedance
Transient voltage characteristics / FRA (frequency response)
All transformers undergo strict testing based on the latest ieee and iec standards, with detailed reports ensuring traceability. this guarantees each unit meets the highest standards of quality, safety, and performance.
Package & Delivery
Engineered packaging and coordinated logistics protect transformers in transit, simplify site handling, and support safe, on-time delivery worldwide
Wooden / Steel Skid with Sealing Film
For nearby deliveries, we recommend skid plus sealing film when you need economical protection, forklift handling and quick onsite positioning.
Wooden / Steel Frame
We suggest wooden or steel framing when you require protection for protruding parts, highway transport, repeated loading and open-deck shipping.
Wooden Crate
Preferred for export and long routes; closed crates protect from weather, dirt and impact, allow stacking and minimise accessory loss.
Container Shipment
Ideal for high-value or overseas projects; containers improve weather protection, security and standardised lashing, simplifying sea–rail–road multimodal logistics.
Transportation & Delivery
We propose skid, frame, crate or container options based on route, handling and budget, ensuring safe, efficient transformer delivery.
Review key FAQ before purchasing a 52-230 kV Power Transformer, covering lead time, grid standard customization,certified components, factory testing, installation support, and long-term reliable operation.
What Is The Lead Time For A 52-230 kV Power Transformer?
The typical lead time for a 52-230 kV power transformer is 3 to 6 months, depending on design complexity, materials, OLTC and bushing delivery,
testing scope, inspection schedule, drawing approval, and transportation requirements.
Can The Transformer Be Customized For Different Grid Standards?
The transformer can be customized according to IEC, IEEE/ANSI, EN, or local utility standards. Project-required certificates, test reports, UL or CE-related
documents, and third-party inspection reports can be provided where applicable.
What Customization Options Are Available For A 52-230 kV Power Transformer?
Customization options include winding material, insulation system, WEIDMANN insulation, MR, ABB or Huaming OLTC, GE or specified accessories,bushing type, transformer oil, cooling system, monitoring system, and anti-corrosion coating.
What Tests Are Performed Before Delivery?
Routine tests include winding resistance, voltage ratio, vector group, impedance, load loss, no-load loss, insulation resistance, applied voltage, induced voltage, partial discharge, and oil tests. Type and special tests can be arranged as required, and third-party witnessed FAT.
Do You Support Installation And Commissioning?
Installation and commissioning support can be provided by documents, remote guidance, video support, or on-site engineers. Support includes
accessory assembly, oil filling, wiring checks, protection verification, pre-energization inspection, and commissioning coordination.
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Kerun Intelec
Contact US
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Add : No.1 Kaiyuan Rd.Jiangshan, Zhejiang, China