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Dry-type transformer

      Widely applicable to harsh environments with high fire resistance requirements, large load fluctuations, pollution, and humidity.  It is the most ideal power supply and distribution equipment for important places such as airports, subways, power plants, metallurgy, etc,Hospitals, high-rise buildings, shopping centers, densely populated residential areas, petrochemicals, scientific research, etc.


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Core indicators

Unit

Parameter

HV Rated VoltagekV11/6.6
LV Rated VoltagekV0.415
Rated FrequencyHz50
Rated CapacitykVA30–2500
Tap Range%±5 / ±2×2.5 / +3−1×2.5
Connection GroupDyn11/Yyn0
Short‑circuit Impedance%4.0–6.0
1min PF Withstand VoltagekV28
Lightning Impulse WithstandkV60
StandardsMS IEC 60076‑11


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      Dry type transformer is a power transformer that uses air/resin as insulation and cooling medium, without combustible media such as transformer oil. Its core characteristics are fire and explosion prevention, insulation and moisture resistance, small size, and convenient operation and maintenance. It is suitable for high-rise buildings, densely populated areas, basements and other scenarios with strict fire prevention requirements. It is also an important configuration type of box type substation (especially dry-type European box type substation). The following summarizes the core characteristics from the dimensions of structural performance, operating characteristics, installation and operation, and scene adaptation.


1、 Core performance: Fire and explosion prevention, insulation and moisture resistance, safe operation;


2、 Structural design: compact and lightweight, modular, suitable for multiple installation scenarios;


3、 Installation and operation: convenient and efficient, maintenance free, adaptable to complex installation environments;


4、 Cost and Scenario: High initial cost, mainly for small and medium-sized capacity, suitable for high fire prevention requirements scenarios;


Core adaptation scenarios:

Indoor power distribution: high-rise buildings, shopping malls, hotels, hospitals, basement power distribution rooms;


Personnel intensive areas: schools, stations, sports centers, and underground parking garages in residential areas;


Special fire prevention zones: power distribution around chemical industrial parks, gas stations, data centers, and warehouses for flammable and explosive materials;


Clean outdoor scenes: European style transformer substations in the core areas and high-end commercial districts of Malaysian cities (requiring the installation of protective boxes)


Comparison DimensionOil-immersed TransformerDry-type Transformer
Insulation & Heat DissipationExcellent insulation performance, high heat dissipation efficiency, and strong overload capacityInsulation depends on air, poor heat dissipation, and weak overload capacity
Cost30%~50% lower manufacturing cost, low operation and maintenance costHigh manufacturing cost; regular insulation inspection required, resulting in high operation and maintenance cost
Service Life20~30 years (hermetically sealed type)10~15 years (conventional type)
Outdoor AdaptabilityStrong protection performance, suitable for outdoor high temperature, salt spray and rainy conditionsWeak protection performance; additional protective box required for outdoor application
Capacity CoverageFull capacity coverage from 30kVA to 3150kVA and aboveMostly 30~1250kVA, extremely high manufacturing cost for large capacity
Fire SafetyFlammable oil medium, potential fire risk in case of internal short circuit; special fire prevention measures requiredIncombustible insulation material, good fire safety performance, no fire spreading risk
Installation & MobilityRelatively heavy due to oil tank and dielectric oil; forklift/crane required for transportation and installation, low mobilityLight weight, convenient for transportation and installation, high mobility
Environmental ImpactRisk of oil leakage for non-hermetically sealed type, which may cause environmental pollution (avoidable by hermetically sealed type)No medium leakage, green and environmentally friendly, no pollution risk
Applicable ScenariosOutdoor power distribution, medium and large capacity power distribution, industrial and municipal power distributionHigh-rise buildings, basements, densely populated areas, clean indoor power distribution


Oil transformer

      

      Oil immersed transformer, with a core made of stacked silicon steel sheets, undergoes annealing treatment to restore its magnetic conductivity to its pre processing level. This product has low no-load loss, low no-load current, low noise, superior mechanical and electrical performance, and is stable and reliable. It is the preferred product for transformer replacement.

        The iron adopts a stepped core joint, which reduces no-load loss and no-load current. The high and low voltage windings adopt a continuous axial oil passage, and U-shaped pads are used between the wire cakes to balance the winding axis and increase the mechanical strength of the winding.


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Core indicators

Unit

Parameter

HV Rated Voltage

kV

11/11.5

LV Rated Voltage

kV

0.415

Rated Frequency

Hz

50

Rated Capacity

kVA

200–2500

Tap Range

%

±5 OR ±2×2.5

Connection Group

Dyn11

Short‑circuit Impedance

%

4.0–5.0

1min PF Withstand Voltage

kV

38

Lightning Impulse Withstand

kV

75

Standards

MS IEC 60076


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       Oil immersed transformer is a power transformer that uses transformer oil as insulation and cooling medium. 

       It is the most widely used type of transformer in the power system, with excellent insulation performance, good heat dissipation effect, strong overload capacity, stable operation and other characteristics. 


1、 Core performance: excellent insulation, efficient heat dissipation, strong overload capacity;


2、 Structural design: Mature technology, reliable sealing, suitable for outdoor use;


3、 Installation and operation: easy to operate, low maintenance cost, suitable for engineering applications;


4、 Cost and Scenario: High cost-effectiveness, full capacity coverage, adaptable to multiple scenarios;


       Excellent cost performance ratio: Under the same capacity, the manufacturing cost of oil immersed transformers is 30% to 50% lower than that of dry-type transformers, and there is no need for additional power consumption for heat dissipation. The energy consumption cost for long-term operation is also lower, making it the economical choice for box type substations.

      Wide capacity coverage: The rated capacity can range from 30kVA (small capacity American box transformer) to 3150kVA and above (large capacity European box transformer), meeting the full scenario needs of Malaysia from light load distribution in residential areas to heavy load distribution in industrial parks.


Core adaptation scenarios:

       Outdoor power distribution: European/American box type substations, outdoor pole mounted transformers, floor standing distribution transformers;

       Medium to large capacity power distribution: industrial parks, oilfield terminals, commercial plazas, urban public power distribution;

Distribution in harsh environments: salt spray areas along the coast of Malaysia, high temperature and humidity areas, and industrial areas with less dust.

       Strong localization adaptability: For the tropical climate of Malaysia, 45 # high ignition point transformer oil can be selected (with better temperature resistance and prevention of high-temperature oil leakage), combined with anti condensation and anti UV design, which can operate stably in an environment of -10 ℃~+50 ℃ for a long time.


 Advantages and Limitations: Oil-immersed Transformer vs Dry-type Transformer

Comparison DimensionOil-immersed TransformerDry-type Transformer
Insulation & Heat DissipationExcellent insulation performance, high heat dissipation efficiency, and strong overload capacityInsulation depends on air, poor heat dissipation, and weak overload capacity
Cost30%~50% lower manufacturing cost, low operation and maintenance costHigh manufacturing cost; regular insulation inspection required, resulting in high operation and maintenance cost
Service Life20~30 years (hermetically sealed type)10~15 years (conventional type)
Outdoor AdaptabilityStrong protection performance, suitable for outdoor high temperature, salt spray and rainy conditionsWeak protection performance; additional protective box required for outdoor application
Capacity CoverageFull capacity coverage from 30kVA to 3150kVA and aboveMostly 30~1250kVA, extremely high manufacturing cost for large capacity
Fire SafetyFlammable oil medium, potential fire risk in case of internal short circuit; special fire prevention measures requiredIncombustible insulation material, good fire safety performance, no fire spreading risk
Installation & MobilityRelatively heavy due to oil tank and dielectric oil; forklift/crane required for transportation and installation, low mobilityLight weight, convenient for transportation and installation, high mobility
Environmental ImpactRisk of oil leakage for non-hermetically sealed type, which may cause environmental pollution (avoidable by hermetically sealed type)No medium leakage, green and environmentally friendly, no pollution risk
Applicable ScenariosOutdoor power distribution, medium and large capacity power distribution, industrial and municipal power distributionHigh-rise buildings, basements, densely populated areas, clean indoor power distribution



American-style box transformer

          The entire product features a compact size, simple installation and maintenance, low noise, low power consumption, anti-theft capability, full protection, and strong overload resistance. It is suitable for new residential communities, green belts, parks, stations, hotels, construction sites, airports, and other venues.

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Product nameUnitParameter
Rated VoltagekV11/0.415
Max. Operating VoltagekV12(high-voltage side)
Rated FrequencyHz50
Rated CapacitykVA50–1600
1min PF Withstand VoltagekV38
Lightning Impulse VoltagekV75
Cooling ModeOil immersed self cooling ONAN
HV Backup Fuse Breaking CurrentkA50
Plug‑in Fuse Breaking CurrentkA25
Ambient Temperature−5~+45
Coil Temperature Rise65
No‑load Regulation±5% ±2×2.5%
Noise LeveldB45
Protection ClassIP43


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1、 Structural design: integrated, compact, occupying minimal space


2、 Electrical performance: Suitable for light load distribution, with simple protection configuration


3、 Installation and operation: convenient construction, strong maintenance free, and lower cost


4、 Usage scenario: Focus on outdoor light load, with clear boundaries for adaptability


Core adaptation scenarios: urban residential communities, villa clusters, street light distribution, small supermarkets, township distribution, temporary construction sites, agricultural irrigation and other small capacity, decentralized, light load outdoor distribution needs.

Scenario limitations: Not suitable for large capacity industrial distribution (such as large industrial and mining areas, industrial parks), high demand ring network distribution systems, high pollution/high salt spray/strong corrosion harsh environments (requiring additional customized protection), and not suitable for scenarios with high requirements for relay protection and intelligent control.


Comparison DimensionAmerican Type Box SubstationEuropean Type Box Substation
Structural DesignIntegrated trinity structure (transformer + HV load switch + fuse), no independent compartments, all electrical components attached to the transformer bodyThree independent compartments (HV cabinet + LV cabinet + transformer), separate layout with independent operation space for each part
Voltage Rating (Malaysia)11kV (HV) / 0.415kV (3P)/0.24kV (1P), 50Hz11kV (HV) / 0.415kV (3P)/0.24kV (1P), 50Hz
Rated Capacity RangeSmall capacity: 30~800kVA (core range for light load)Full capacity: 50~3150kVA and above (supports heavy load)
Floor AreaUltra-compact: 1~3 ㎡, small occupationRelatively large: 3~8 ㎡, need reserved operation space
Power Supply ModeMainly radial/terminal type, simple ring network available for customization (poor flexibility)Both terminal type and ring network type available, flexible ring network power supply for complex distribution networks
HV Protection ConfigurationSimple protection: Fuse + load switch, no complex relay protection device, realize quick short-circuit/overload protectionComplete protection: HV circuit breaker + professional relay protection device, support precise fault protection and tripping
Installation CycleExtremely short: ≤24h, factory pre-assembled and debugged, on-site only cable connection and groundingRelatively long: 3~7 days, on-site secondary wiring, debugging and compartment commissioning required
Initial CostLow: 1/2 ~ 2/3 of the European type with the same capacity (no independent HV/LV cabinets, less material consumption)High: Independent components and three-compartment structure, high material and process costs
Operation & MaintenanceLow difficulty: Fully sealed transformer (no oil conservator), few fault points, basically maintenance-free, only regular visual inspection and cleaningModerate difficulty: Independent three compartments, need regular inspection and maintenance of HV/LV cabinet components and transformer oil
Core Application Scenarios (Malaysia)Outdoor light load & decentralized distribution: Residential quarters, street lamp power supply, small supermarkets, township distribution, temporary construction sitesFull-scenario power distribution: Industrial parks, oil fields/wharves, urban public distribution, high-rise buildings, large commercial plazas, heavy load industrial distribution
Expansion & TransformationDifficult: Compact internal space, unable to expand capacity or add intelligent/relay protection components laterEasy: Independent compartment design, sufficient reserved space, convenient for capacity expansion and functional upgrade
Overhaul ConveniencePoor: Integrated components, overall disassembly and replacement required for fault, unable to maintain a single component independentlyGood: Independent compartments, components can be disassembled and maintained separately, quick fault troubleshooting
Protection Grade (Basic)IP43 (outdoor basic dustproof and rainproof)IP54 (outdoor high dustproof and rainproof), IP55 for coastal customization
Noise Level≤50dB (lower, suitable for residential areas)≤55dB (complies with Malaysia's noise specification for commercial/residential areas)
MobilityHigh: Small size and light weight, movable by forklift, suitable for temporary power distributionLow: Large size and heavy weight, fixed installation, not easy to move


European-style compact substation

       Suitable for urban public power distribution, street light distribution, industrial and mining enterprises, urban buildings, residential communities, oil field docks, hotels, parks, and construction sites, etc., it can achieve ring network or terminal power supply mode.


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Product name

Unit

Parameter

Rated Voltage (HV)

kV

11/0.415

Rated Capacity (HV)

kVA

200、400、630

1min PF Withstand Voltage

kV

35/45

Lightning Impulse Withstand

kV

65/80

Rated Voltage (LV)

kV

11/0.415

Rated Capacity (LV)

kVA

50~3150

Rated Frequency

Hz


Protection Class

IP55

Noise Level

dB

 ≤55

Standards

IEC 62271-202


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        The European style box type substation is a pre installed distribution equipment with independent separation of high voltage cabinet, low voltage cabinet, and transformer three compartments. Its core features are modular structure, standardized configuration, and comprehensive performance, suitable for full capacity and multi scenario distribution needs, especially meeting high requirements for power supply reliability, protection integrity, and expansion flexibility in medium and large capacity industrial distribution, urban public distribution, and other scenarios. It fully complies with the TNB distribution network specifications in Malaysia and the complex outdoor working conditions in Southeast Asia. The following are its core features:


1. Structural Design: Modular Separation, Safe and Standardized;


2. Electrical Performance: Full Capacity Coverage, Complete Protection and Reliable Power Supply;


3. Installation and Operation: Standardized Construction, Convenient Expansion and Low Long-term Cost;


4. Application Scenarios: Full-scenario Adaptation, No Restrictions on Light/Heavy Load;


The European type box substation is the mainstream type of pre-installed substation in Malaysia, and its core adaptation scenarios cover all types of outdoor/indoor distribution needs:

  • Urban public distribution: urban road network, park, commercial plaza, high-rise building distribution;

  • Industrial and mining enterprise distribution: industrial park, factory workshop, oil field, wharf, construction site heavy load distribution;

  • Municipal infrastructure: street lamp power supply, water supply and drainage system, traffic signal power supply;

  • Residential area distribution: large and medium-sized residential quarters, apartment buildings with high requirements for power supply reliability;



Comparison Dimension

American Type Box Substation

European Type Box Substation

Structural Design

Integrated trinity structure (transformer + HV load switch + fuse), no independent compartments, all electrical components attached to the transformer body

Three independent compartments (HV cabinet + LV cabinet + transformer), separate layout with independent operation space for each part

Voltage Rating (Malaysia)

11kV (HV) / 0.415kV (3P)/0.24kV (1P), 50Hz

11kV (HV) / 0.415kV (3P)/0.24kV (1P), 50Hz

Rated Capacity Range

Small capacity: 30~800kVA (core range for light load)

Full capacity: 50~3150kVA and above (supports heavy load)

Floor Area

Ultra-compact: 1~3 ㎡, small occupation

Relatively large: 3~8 ㎡, need reserved operation space

Power Supply Mode

Mainly radial/terminal type, simple ring network available for customization (poor flexibility)

Both terminal type and ring network type available, flexible ring network power supply for complex distribution networks

HV Protection Configuration

Simple protection: Fuse + load switch, no complex relay protection device, realize quick short-circuit/overload protection

Complete protection: HV circuit breaker + professional relay protection device, support precise fault protection and tripping

Installation Cycle

Extremely short: ≤24h, factory pre-assembled and debugged, on-site only cable connection and grounding

Relatively long: 3~7 days, on-site secondary wiring, debugging and compartment commissioning required

Initial Cost

Low: 1/2 ~ 2/3 of the European type with the same capacity (no independent HV/LV cabinets, less material consumption)

High: Independent components and three-compartment structure, high material and process costs

Operation & Maintenance

Low difficulty: Fully sealed transformer (no oil conservator), few fault points, basically maintenance-free, only regular visual inspection and cleaning

Moderate difficulty: Independent three compartments, need regular inspection and maintenance of HV/LV cabinet components and transformer oil

Core Application Scenarios (Malaysia)

Outdoor light load & decentralized distribution: Residential quarters, street lamp power supply, small supermarkets, township distribution, temporary construction sites

Full-scenario power distribution: Industrial parks, oil fields/wharves, urban public distribution, high-rise buildings, large commercial plazas, heavy load industrial distribution

Expansion & Transformation

Difficult: Compact internal space, unable to expand capacity or add intelligent/relay protection components later

Easy: Independent compartment design, sufficient reserved space, convenient for capacity expansion and functional upgrade

Overhaul Convenience

Poor: Integrated components, overall disassembly and replacement required for fault, unable to maintain a single component independently

Good: Independent compartments, components can be disassembled and maintained separately, quick fault troubleshooting

Protection Grade (Basic)

IP43 (outdoor basic dustproof and rainproof)

IP54 (outdoor high dustproof and rainproof), IP55 for coastal customization

Noise Level

≤50dB (lower, suitable for residential areas)

≤55dB (complies with Malaysia's noise specification for commercial/residential areas)

Mobility

High: Small size and light weight, movable by forklift, suitable for temporary power distribution

Low: Large size and heavy weight, fixed installation, not easy to move



Outdoor intelligent box type switchgear

  This switchgear does not require civil construction and occupies a small area. Its configuration is very flexible and the power supply method is more reliable. The construction, installation,and commissioning time are greatly reduced, and the overall cost is lowered.


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Core indicators

Unit

Parameter

Rated Voltage

  kV


Rated Current

  A

630

Rated Active Load Breaking

  A

630

Rated Loop Breaking

  A

630

Short‑circuit Making Current (Peak)

  kA

50

Short‑time Withstand Current (3s)

  kA

20

1min PF Withstand Voltage

  kV

45

Lightning Impulse Withstand

  kV

75

Mechanical Life

  Time

≥2000

Loop Resistance

  μΩ

≤100

Protection Class

  —

IP4X

Standards

  —

MS IEC 62271‑200


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      The outdoor intelligent box type switchgear (XGW-12/HWX-12, etc.) is a new generation of distribution network core equipment that integrates primary and secondary equipment, is fully sealed outdoors, highly intelligent, and can be unmanned. Its core features are strong environmental tolerance, primary and secondary integration, three remote+self-healing, modular maintenance free, safe and reliable, and rapid deployment.


1. Primary and secondary deep integration, high level of intelligence (core);


2.Fully sealed and insulated, with strong resistance to outdoor environments;


3.Modular and compact, flexible deployment, and fast construction;


4.High reliability, long cycle maintenance free;


5.Safe and environmentally friendly, widely applicable in various scenarios;


The core difference from ordinary outdoor  cages:


Comparison Dimension

Outdoor circular net cageOutdoor intelligent box type switchgear
intelligentizationBasically none/simpleThree remote+DTU+self-healing+remote monitoring
primary and secondary integrationSeparate type, requiring external secondary connectionDeep integration, integrated design
Maintenance ModeManual inspection+on-site operationUnmanned operation+remote maintenance
Fault handlingManual investigation+isolationMillisecond level automatic positioning+self-healing
construction periodLong, requiring secondary constructionShort, factory prefabrication+on-site quick installation


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