General
Application
Environmental
Standards
The oil-filled ground-mounted distribution transformer with cable box is engineered for reliable medium-voltage to low-voltage power distribution in outdoor settings. Its sealed oil-immersed design ensures efficient cooling and long service life, while the integrated cable box provides secure, weatherproof connections and simplified installation. Built to withstand environmental and load variations, it offers safe, low-maintenance operation and compatibility with utility or industrial network requirements.
Oil-filled ground-mounted distribution transformers with cable boxes are applied wherever medium-voltage distribution must be stepped down near the load using compact, outdoor equipment and underground cabling—typical sites include hospitals, airports, factories, shopping centers, data centers, rail/underground transit, and wind or solar plants. Integrated high- and low-voltage cable boxes provide enclosed, weather-resistant terminations with configurable IP ratings, simplifying cable routing, protecting connections, and supporting safe field access.
Application:outdoor installation.
Ambient temperature: -50°C to +40°C
Relative humidity: ≤90% (at 25°C); ambient air RH <93%.
Altitude: ≤1000m above sea level.
Max wind speed: ≤35 m/s.
Seismic withstand: Horizontal ≤0.3 g; Vertical ≤0.15 g.
Special conditions: Custom-built solutions available for project-specific requirements.
Ambient temperature: -50°C to +40°C
Relative humidity: ≤90% (at 25°C); ambient air RH <93%.
Altitude: ≤1000m above sea level.
Max wind speed: ≤35 m/s.
Seismic withstand: Horizontal ≤0.3 g; Vertical ≤0.15 g.
Special conditions: Custom-built solutions available for project-specific requirements.
IEC 60076 series – Distribution transformers.
IEC 60529 – IP protection.
EN 50588 / EN 50708 – Distribution transformer energy performance.
EU Eco-design Regulation for Transformers.
IEEE C57.12.00 & IEEE C57.12.90 – General requirements & test code.
IEEE/ANSI C57.12.34 – Pad-Mounted / Ground-mounted distribution Transformers.
IEC 60529 – IP protection.
EN 50588 / EN 50708 – Distribution transformer energy performance.
EU Eco-design Regulation for Transformers.
IEEE C57.12.00 & IEEE C57.12.90 – General requirements & test code.
IEEE/ANSI C57.12.34 – Pad-Mounted / Ground-mounted distribution Transformers.
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Transformer Features
Ground-mounted transformers with integrated cable boxes deliver reliable power distribution, simplified maintenance, and durable outdoor performance.
Flexible Design - Well-matched to a Range of Applications.
Engineered with configurable winding layouts and adjustable voltage taps to optimize performance across diverse grid conditions, ensuring adaptable power distribution for dynamic load requirements.
Space Saving – Effective, Flexible Layout
A compact, modular structure with optimized component placement minimizes footprint while maintaining full power capacity, ideal for installations with restricted space constraints.
Laborsaving – Reduction of Manpower
Factory-preassembled cable terminations and standardized connections enable quick commissioning, reducing on-site installation time and labor costs by up to 50%.
Energy Saving – Reduced Operating Costs
High-efficiency grain-oriented silicon steel core and advanced cooling design achieve ultra-low no-load and load losses, significantly reducing operational energy consumption.
High Reliability – Long-term, Trouble-free Operation
Robust welded tank construction, moisture-resistant insulation, and corrosion-protected components ensure stable long-term performance in harsh environmental conditions.
Safe Design – Ensures Operator’s Safety
Designed with explosion-proof reinforced tank construction, rapid-acting pressure relief valves, and arc-quenching cable compartments to prevent hazardous incidents while maintaining operational integrity under electrical faults.
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
HV&LV&Neutral bushings
Cable Box
Terminal Box
Tap changer
Oil level gauge
Oil Thermometer indicator
Pressure relief device
Gas relay
Oil sample valve
Oil drain valve
Transformer breather
Earthing terminals
Lifting lugs
Rating plate
Optional Features
DIN/EN/ANSI bushings
Off Circuit/On-load Tap changer
Copper/aluminum windings
Dial type thermometer with two contacts
DGPT2 / RIS / DMCR control device
Pressure – vacuum gauge
Pressure relief valve with contacts
Winding Temperature Indicator
LV/HV Cable boxes / Common cable box
Protection CT
Bidirectional rollers
Design Drawings
Design drawings specify integrated cable chamber, defined interfaces, partitioned routing for phase separation, reduced EMI, minimal maintenance, robust environmental resilience.
10.5kV-630kVA-Distribution-Transformer-with-Cable-Box-drawing
22kV-800kVA-Distribution-Transformer-with-Cable-Box-drawing
33kV-1000kVA-Distribution-Transformer-with-Cable-Box-drawing
Accessories Include
Cable Box
Cable Box Cover
HV Cable Termination
LV Cable Termination
HV Bushings
LV Bushings
Cable Glands
Terminal Connectors
Busbars
Tap Changer
Surge Arrester
Use Holder
Earthing Terminal
Oil Level Gauge
Oil Temperature Indicator
Winding Temperature Indicator
Pressure-Thermostat
Gas Relay
Pressure Relief Valve
Drain Valve
Oil Sampling Valve
Oil Filling Plug / Valve
Transformer Tank
Radiators
Wheel
Lifting Lugs
Nameplate
Insulating Oil
About Construction
Purpose-built accessories for cable-box configurations enhance safety, uptime, and installation efficiency in public-facing or industrial sites, while aligning with IEC 60076/ANSI C57 practices and utility work methods.
01
Tanks
02
Core
03
Coils
04
Transformer Active Part
05
Conservator
06
Corrugated radiator
Tanks
Tank for ground-mounted distribution transformers with cable box is fabricated from low-carbon steel with customisable thickness, dimensions, and special footprints. CNC laser cutting ensures accurate plate geometry, while robotic welding delivers consistent seam quality. Abrasive blasting produces a clean profile, improving adhesion of galvanizing and powder coating, with optional RAL colours, providing corrosion protection and low maintenance in outdoor environments.
Dimensions/structure: Customized special configurations supported.
Robotic welding delivers uniform seams and minimizes leakage risk.
Core
For ground-mounted distribution transformers with cable box, the core uses CRGO or HiB steel with custom thickness and dimensions; thinner laminations reduce eddy losses, noise, vibration. Vision-guided (±0.02 mm) robotic stacking maintains verticality ≤0.1 mm/m, preventing gaps that raise reluctance. Step-lap joints with 5–10 mm overlap smooth flux and limit stray losses. Digital logs capture cut and placement for traceability.
Material options: Available in grain-oriented silicon steel or amorphous alloy
Dimension customization: Custom sizes and lamination thicknesses available.
Coils
Coils for ground-mounted distribution transformers with cable box use copper or aluminum conductors, with low-voltage windings optionally in copper or aluminum foil for improved short-circuit strength. DMD, Nomex® and Weidmann insulation systems are selectable to match thermal class and reliability needs. Precision winding and controlled drying reduce losses, enhance mechanical stability and extend lifetime under demanding utility and industrial duty.
HV/LV Winding materials:Cu/Al wire.LV also available in Cu/Al foil.
Insulation materials: optional DMD, Nomex®, or Weidmann.
Transformer Active Part
Engineered for superior performance, the active part minimizes core and load losses through optimized magnetic circuit design. Controlled flux density and balanced phase currents reduce vibration and audible noise. PD-screened insulation with graded clearances enhances dielectric strength and lightning impulse withstand, supporting efficient operation, stable temperature behaviour and long-term reliability for ground-mounted distribution transformers with cable boxes.
Low no-load and load losses improve efficiency and reliability.
Rigid clamping frames reduce vibration, noise and displacement.
Conservator
The conservator is made from coated carbon steel or stainless steel to provide oil expansion management. Its cylindrical design accommodates thermal volume changes, with an integrated oil level indicator for clear monitoring. Custom capacities, mounting and connections support insulation integrity, limit moisture ingress and extend transformer service life via the breathing system.
Manages oil expansion, reducing tank mechanical stress and deformation.
Separates oil from ambient air, limiting moisture ingress and oxidation.
transformer radiator
Manufactured from high-strength cold-rolled steel, the corrugated radiator delivers efficient heat dissipation and robust mechanical stability. Hot-dip galvanizing and optional protective coatings provide strong corrosion resistance, extending service life and limiting maintenance. Customisable panel heights, cooling capacities and coating systems allow precise thermal management, reduced lifecycle costs and reliable outdoor performance for ground-mounted distribution transformers with cable boxes.
Automated seam welding ensures oil-tight, uniform radiator chambers.
Shot-blasted steel surfaces enhance coating adhesion and durability.
About Accessories
Accessories can be customized to match cable connection method, ground-mounted installation layout, protection requirement, and site maintenance practice.
01
HV/LV Bushings
02
Tap Changer
03
Cable Box
04
Terminal Box
05
Oil Level indicators
06
Oil Thermometer indicator
07
Winding Temperature Indicator
08
Pressure Relief Valve
09
Earthing terminals
10
Nameplate
11
wheel
12
Gas relay
13
Oil sample Device
14
Oil drain valve
15
Transformer breather
HV/LV Bushings
Porcelain bushings for ground-mounted distribution transformers with cable box cover 6–36 kV ratings and support DIN, EN or ANSI interfaces. A high-strength insulated inner tube, impact-resistant housing and robust sealing system protect against moisture ingress. Optional conductive terminals and snap-on, sliding or clamping-type protectors allow flexible connection, improving electrical reliability and safety in outdoor distribution applications.
Voltage range: HV bushings available from 6–36 kV
Type options: DIN, EN, or ANSI configurations available.
Tap changer
Tap changers for ground-mounted distribution transformers with cable box use copper or silver-plated contacts in an oil-immersed, epoxy-insulated mechanism to ensure low resistance and stable switching. Off-circuit tap changers are selectable for various tap ranges to accommodate grid voltage variation. Options include external operating handles, secure lockable positions and customised tap steps aligned with utility regulation, network optimisation and long-term reliability.
Type selection: DETC (off-circuit) or OLTC (on-load) available.
Tap ranges ：(±2.5% to ±10%), 5–33 positions available.
Cable Box
Cable boxes for ground-mounted distribution transformers with cable box use formed carbon-steel or stainless-steel enclosures with reinforced doors and gasketed joints. Internal layouts accommodate screened terminations, earthing bars and surge arresters. Custom options include IP and IK ratings, cable gland or elbow interfaces, segregation, interlocks and enclosure dimensions tailored to utility safety practices, safe inspection access and site installation constraints.
Multiple cable entry points for flexible routing.
Multiple cable entry configurations available for flexible routing.
Terminal Box
Terminal boxes on ground-mounted distribution transformers with cable box are fabricated from formed carbon steel with welded brackets and a gasketed, lockable door to meet defined IP protection. Numbered terminals support CT, PT, protection and monitoring circuits. Options include terminal count and cross-section, gland plate layout, entry orientation, warning labels and coating systems tailored to utility practice and environment.
Design variants support auxiliary power, monitoring and communication terminations.
Optional stainless-steel construction improves durability and tamper resistance.
Oil Level indicators
Oil level indicators for ground-mounted distribution transformers with cable box use UV-resistant polycarbonate windows, stainless-steel fasteners and corrosion-protected housings to ensure clear, durable oil-level visibility. Magnetic or float-operated mechanisms provide reliable indication under vibration and temperature swings. Custom scales, alarm contacts, temperature-compensated markings and mounting interfaces align with site monitoring practices, simplifying inspections and preventing oil-related failures over the asset lifetime.
Clear graduated scales allow quick visual checks during inspection.
Vertical or horizontal mounting options suit different tank designs.
Oil Thermometer indicator
Thermometer indicators for ground-mounted distribution transformers with cable box feature stainless-steel or aluminium housings, oil-compatible sensing bulbs and tempered-glass dials. Bimetal or gas-actuated mechanisms with resettable pointer provide accurate top-oil temperature indication; configurable dial size, scale range, capillary length and switch contacts support readings, alarm integration and thermal protection.
Bimetal sensing element ensuring accurate temperature measurement.
Resettable maximum pointer records peak oil temperatures for diagnostics.
Winding Temperature Indicator
The winding temperature indicator on ground-mounted distribution transformers with cable box simulates winding hot-spot temperature using a top-oil sensor and current-proportional heater. It drives alarm, trip, and cooling stages, reducing insulation ageing and unexpected outages. Options include multiple switch contacts, remote SCADA outputs, customized dial ranges, and dual scales, supporting flexible protection coordination and condition-based loading decisions during its life.
Hottest-spot simulation for accurate thermal monitoring.
Configurable micro-switches for alarm and trip signaling.
Pressure Relief Valve
Pressure relief devices for ground-mounted distribution transformers with cable box use corrosion-resistant aluminium or stainless-steel bodies, spring-loaded or diaphragm mechanisms and oil-compatible seals. They open at a defined overpressure to vent gas and oil mist, then reseat to maintain tank integrity. Options include set pressure, discharge capacity, connection size, orientation and auxiliary alarm contacts for remote fault indication and safety interlocking.
Factory-calibrated set pressure configurable to transformer design limits.
Spring-loaded mechanism opens at preset pressure, then reseals automatically.
Earthing terminals
Earthing terminals for ground-mounted distribution transformers with cable box use tinned copper or galvanised steel lugs and pads, welded or bolted to the tank for a low-impedance fault path. Serrated contact faces and corrosion-resistant hardware maintain stable bonding over time. Options include single or multiple earth points, bar extensions, pad size, hole pattern and labeling to match site earthing and safety standards.
Tinned copper terminals resisting corrosion in humid environments.
Secure clamping mechanism guaranteeing ground connection integrity.
Nameplate
Nameplates for ground-mounted distribution transformers with cable box are made from etched stainless steel or anodized aluminium, providing long-term corrosion resistance and legible identification in outdoor service. Laser-engraved or stamped data includes ratings, connection diagrams, standards and warning information. Layout, language, logo, fixing holes and plate size are configurable to align with utility documentation practices and site-specific labelling requirements.
Customizable nameplate materials with multiple language options.
Data fields configured per customer requirements and standards.
Wheel
Wheels for ground-mounted distribution transformers with cable box use welded steel hubs with machined running surfaces and corrosion-protected coatings, sized for full oil-filled transport loads. Options include plain-steel, rubber-tyred or polyurethane-tired designs, fixed or bi-directional wheels, gauge and rail compatibility, and locking arrangements, supporting safe site positioning, short-distance shunting during installation and flexible layout on concrete or steel rails.
Wheel materials selectable: cast steel, ductile iron, polyurethane.
Meets IEC 60076-22-7 accessory requirements for compliance globally.
Gas relay
Gas relays for ground-mounted distribution transformers with cable box are installed between tank and conservator, using cast aluminium housings, float mechanisms and oil-compatible plastics to detect internal faults. They sense slow gas accumulation and sudden oil surges, operating alarm and trip contacts. Configurable sensitivity, contact arrangement and flange interfaces support coordinated protection and straightforward integration with utility network protection schemes.
Integrates with hermetic enclosures without compromising seal integrity.
Trip contact reacts to rapid oil flow during severe faults.
Oil Sample Device
The oil sampling device provides a dedicated, low-turbulence access point for extracting representative insulating liquid samples during service or routine inspections. Located on the tank wall with clear identification, it supports periodic dissolved gas analysis, moisture measurement, and dielectric strength testing. Robust metal construction, sealed fittings, and optional lockable caps enhance operator safety, environmental protection, and long-term transformer reliability performance.
Tight sealing prevents moisture ingress and particulate contamination.
Enables convenient in-service oil sampling without planned outages.
Oil Drain Valve
Oil drain valves for ground-mounted distribution transformers with cable box use brass or stainless-steel bodies with oil-compatible seats and seals for reliable tight shut-off. Full-bore designs support controlled emptying and flushing during maintenance. Custom options include nominal size, thread or flange connection, hose coupling, lockable handles and protective caps, aligning with site safety procedures and utility-specific service practices.
Brass construction ensuring excellent corrosion resistance.
Various connection standards like NPT and BSP.
Transformer breather
Transformer breathers for ground-mounted distribution transformers with cable box use robust transparent housings, indicating silica-gel desiccant. As the conservator breathes, incoming air is dried before contacting the oil, limiting moisture, sludge formation and corrosion. Connection size, desiccant capacity, refill method and colour-change indicators are configurable to support dielectric strength and predictable maintenance intervals in humid environments.
Color-changing silica gel for easy status monitoring.
Transparent bowl allowing visual inspection of desiccant.
About Oil-Filled
Transformer oil selection tailored for network voltage, loading profile, ambient temperature and safety requirements, supporting reliable long-term operation.
Mineral Oil
Low Transformer Cost
Preventative maintenance
Good Dielectric Performance
Potentialhigher installation cost
Low Maintenance Cost
Vaults required for indoor installations per NEC® due to low fire
Good heat dissipation
<30% biodegradability
Good cold climate performance
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
Routine, type and special tests verify insulation, losses, noise and reliability for ground-mounted distribution transformers with cable boxes.
Routine Tests
Type Tests
Special Tests
Winding resistance
Voltage ratio & polarity / phase displacement
No-load loss & no-load current
Load loss & short-circuit impedance
Applied AC withstand voltage
Induced AC withstand voltage
Insulation resistance (IR/PI)
Oil tests (BDV, moisture)
Tank pressure / leak tightness
Cable box inspection & functional check
Temperature rise
Lightning impulse withstand
Sound level measurement
Partial discharge measuremen
Short-circuit withstand (design verification)
Zero-sequence impedance
Capacitance & dissipation factor (tan δ)
SFRA (frequency response)
Dielectric response (FDS/PDC)
.DGA baseline (oil)
Cable box interface dielectric check
Enclosure IP / water ingress verification
Coating / corrosion tests
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 controlled logistics protect transformers from damage, simplifying site handling, offloading, installation and commissioning project schedules.
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 Ground Mounted Distribution Transformer with Cable Box, covering lead time, grid standard customization,certified components, factory testing, installation support, and long-term reliable operation.
What Is The Lead Time For A Ground Mounted Distribution Transformer with Cable Box?
The typical lead time for a Ground Mounted Distribution Transformer with Cable Box is 4 to 8 weeks, depending on rated capacity, voltage class,
cable box structure, bushing arrangement, enclosure design, protection configuration, factory testing, drawing approval, and transportation requirements.
cable box structure, bushing arrangement, enclosure design, protection configuration, factory testing, 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, CE,KEMA,KERI or related documents, and third-party inspection reports can be provided where applicable.
What Customization Options Are Available For A Ground Mounted Distribution Transformer with Cable Box?
Customization options include winding material, insulation system, HV cable box, LV cable box, cable gland plate, terminal arrangement,
bushing type, transformer oil, tap changer, protection devices, monitoring accessories, enclosure material, and anti-corrosion coating.
bushing type, transformer oil, tap changer, protection devices, monitoring accessories, enclosure material, 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, inducedvoltage, leak test, 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
foundation guidance, cable termination checks, wiring inspection, grounding verification, protection testing, pre-energization inspection, and commissioning coordination.
foundation guidance, cable termination checks, wiring inspection, grounding verification, protection testing, pre-energization inspection, and commissioning coordination.
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Kerun Intelec
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