112.5 KVA Three Phase Pad Mounted Transformer

112.5kVA Three-Phase Pad Mounted Transformer Solution

I. Selection Scheme of 112.5kVA Three-Phase Pad Mounted Transformer

As a high-reliability medium-capacity power distribution equipment, the selection of 112.5kVA three-phase pad mounted transformer needs to combine the power supply requirements, environmental conditions, energy efficiency standards and life-cycle costs of the application scenarios, and take into account the equipment adaptability and operational economy. It is a core link in the power distribution design of key scenarios such as subway stations, data centers and hospitals.

1. Type and Core Adaptability Characteristics

• Mainstream Selection: It is recommended to adopt the compact three-phase oil-immersed pad mounted transformer, which is adaptable to the full capacity range of 45kVA-12000kVA. The rated capacity of 112.5kVA is an optimal selection for medium scenarios, which can flexibly match the single-circuit power supply or dual-circuit redundant power supply design to meet the load requirements of high-reliability power supply scenarios.
• Insulation and Cooling: The efficient self-cooling design is adopted by default, suitable for outdoor/semi-outdoor installation environments; the FR3 vegetable oil insulation scheme can be customized. Compared with traditional mineral oil, it has improved fire performance and is suitable for scenarios with strict fire protection requirements such as indoor/underground (e.g., subway stations, underground data centers).

2. Electrical Parameters and Standard Specifications

• Core Parameter Configuration: Rated capacity of 112.5kVA, wide voltage adaptability with primary voltage of 2400V-46000V and secondary voltage of 120V-24940V, and basic impulse level (BIL) of 30kV-250kV. The tap changer can be customized according to the power grid operating conditions to adapt to the voltage fluctuation requirements of different regions.
• Energy Efficiency and Industry Standards: The efficiency is more than 99%, fully complying with the US DOE2016 energy efficiency regulations, and the no-load loss and load loss are far lower than the industry average; it implements the core standards of ANSI/IEEE-C57.12.00, C57.12.34 and CSA-C227.4, and also meets the global general standards of ANSI 57, IEEE C57 and IEC60076.
• Certification System: It has passed the full-dimensional certifications of ISO, CE, IEC, CSA and UL. FM Global (indoor/outdoor) and UL/cUL cover most ratings, and the product meets the access requirements of major global markets such as North America, East Asia and Southeast Asia.

3. Scenario-Based Environmental Adaptability

• High Protection Scenarios: IP54 (NEMA 3R) high protection grade, dust and moisture proof, suitable for harsh environments such as coastal high humidity, outdoor dusty areas and industrial parks, and can operate stably without additional protective measures.
• Fire Protection and Environmental Protection Scenarios: The FR3 vegetable oil insulation version can be selected for scenarios such as urban core areas, hospitals and data centers, with a biodegradation rate of more than 95%, no leakage pollution risk and greatly reduced fire hazards.
• Low-Noise Scenarios: It meets the NEMA TR-1 sound level standard with low operating noise, suitable for noise-sensitive scenarios such as airports, hospitals and the surrounding areas of residential communities.
• Customized Scenarios: It supports customized design for special environments such as high altitude and high temperature, and the impedance parameters can be adjusted according to the load characteristics of scenarios such as photovoltaic power generation and industrial parks to improve grid connection compatibility.

4. Technical sheet for 112.5kva three-phase pad-mounted transformer

Capacity: 112.5KVA Pad Mounted TransformerRated voltage: 10kV, 11kV, 13.8kV, 20kV, 33kV, 34.5kV,35kV;Maximum operating voltage：38.5kV

STANDARD COMPONENTS

Connections and neutral configurations

•     Delta - Wye: Low voltage neutral shall be a fully insulated X0 bushing with removable ground strap.

•     Grounded Wye-Wye: High voltage neutral shall be internally tied to the low voltage neutral and brought out as the H0X0 bushing in the secondary compartment with a removable ground strap.

•     Delta-Delta: Transformer shall be provided without a neutral bushing.

•     Wye-Wye: High voltage neutral shall be brought out as the H0 bushing in the primary compartment and the low voltage neutral shall be brought as the X0- bushing in the secondary compartment.

•     Wye-Delta: High voltage neutral shall be brought out as the H0 bushing in the primary compartment. No ground strap shall be provided (line to line rated fusing is required).

High and low voltage bushings

•     200 A bushing wells (15, 25, and 35 kV)

•     200 A, 35 kV Large Interface

•     600 A (15, 25, and 35 kV) Integral bushings (dead-front)

Electrical-grade wet-process porcelain bushings(live-front)

Tank/cabinet features

•    Bolted cover for tank access (45-2500 kVA)

•    Welded cover with hand hole (>2500 kVA)

•    Three-point latching door for security

•    Removable sill for easy installation

•    Lifting lugs (4)

•    Stainless steel cabinet hinges and mounting studs

•    Steel divider between HV and LV compartment

•    20" Deep cabinet (45-1000 kVA)

•    24" Deep cabinet (1500-7500 kVA)

•    30" Deep cabinet (34.5/19.92 kV)

•    Pentahead captive bolt

•    Stainless steel 1-hole ground pads (45-500 kVA)

•    Stainless steel 2-hole ground pads (750-10,000 kVA)

•    Parking Stands (dead-front)

Valves/plugs

•    One-inch upper filling plug

•    One-inch drain plug (45-500 kVA)

•    One-inch combination drain valve with sampling device in low voltage compartment (750-10,000 kVA)

•    Automatic pressure relief valve

Nameplate

•    Laser-scribed anodized aluminum nameplate

Note: This drawing is the general assembly drawing for 300kVA.

II. Design and Installation Scheme of 112.5kVA Three-Phase Pad Mounted Transformer

1. Overall Design and Layout Principles

• Structural Design: Adopting compact integrated design with small volume and light weight, it does not require a dedicated power distribution room and can be directly installed on outdoor concrete foundations, indoor equipment rooms or container-type power distribution rooms, which greatly saves installation space and is suitable for space-constrained scenarios such as subway stations and airports.
• Power Distribution Connection: It supports cable direct connection, with a reasonable layout of terminals, which can be seamlessly connected with high and low voltage switchgear, simplifying the layout of the power distribution system and reducing the complexity of on-site construction; an intelligent monitoring interface is reserved for easy installation of monitoring equipment later.

2. Key Installation Processes

The installation of the transformer must strictly follow the ANSI/IEEE installation specifications and on-site construction plans, with the core steps as follows:

• Foundation and Placement: A horizontal concrete foundation shall be poured before installation and fixed with anchor bolts, with a levelness error of ≤1%; the main body can be placed with small hoisting equipment, suitable for installation in narrow spaces without large cranes.
• Wiring and Protection: Check the phase sequence and voltage level for the wiring of high and low voltage sides, and do a good job of insulation protection after wiring is completed; the shell shall be anti-corrosive treated, and the anti-corrosive coating can be upgraded in coastal/salt spray areas to improve the weather resistance of the equipment.
• Oil Filling and Standing: For equipment with FR3 vegetable oil insulation, the oil quality shall be checked before oil filling, and the equipment shall stand for more than 12 hours after oil filling to ensure no residual gas inside; the mineral oil version shall complete vacuum oil filling according to standards to remove moisture and impurities.

3. Grounding and Safety Protection

• Reliable Grounding: The equipment shell and neutral point must be independently and reliably grounded with a grounding resistance of ≤4Ω to ensure personal and equipment safety; the grounding terminal adopts thickened copper bar with good contact and corrosion resistance.
• Lightning Protection: When installed outdoors, an arrester shall be installed on the high-voltage side to prevent damage to the equipment caused by lightning overvoltage; it is adapted to the lightning protection system on the power grid side to improve the lightning protection capability of the overall power distribution system.
• Misoperation Prevention: The high and low voltage terminals are equipped with protective cover plates with lock design to prevent misoperation by non-professionals and improve the safety of on-site operation.

III. Commissioning and Operation & Maintenance Scheme of 112.5kVA Three-Phase Pad Mounted Transformer

1. Handover Test

A strict handover test must be completed before commissioning to fully verify the electrical performance of the equipment. The test items comply with the ANSI C57.12.90 test standard, including the core items as follows:

• Basic Electrical Test: Winding DC resistance test, transformation ratio and polarity test to check the contact condition of the tap changer and verify the correctness of the wiring group.
• Insulation Performance Test: Insulation resistance test, induced voltage withstand test to detect the insulation strength between the winding and the shell and ensure no insulation defects.
• Oil Quality Test (Oil-immersed type): Breakdown voltage and micro water content test of insulating oil (or FR3 vegetable oil). For the vegetable oil version, the biodegradability and thermal stability are additionally tested.
• No-Load and Load Test: No-load loss and load loss test to verify whether the equipment energy efficiency meets the DOE2016 standard and whether the efficiency reaches more than 99%.

2. System Commissioning and Commissioning

• Protection Joint Commissioning: Complete the integrated transmission test of overcurrent, overload, zero-sequence protection and the circuit breaker of the power distribution system to ensure accurate action of the protection device and realize rapid fault removal.
• No-Load Trial Operation: The newly commissioned equipment shall undergo a 24-hour no-load trial operation to monitor parameters such as oil temperature, winding temperature and operating noise to confirm no abnormal heating and abnormal noise.
• On-Load Commissioning: Conduct on-load test after the no-load trial operation is qualified, gradually increase the load to the rated value, and monitor parameters such as voltage, current and power factor to ensure that the on-load capacity of the equipment meets the design requirements.

3. Intelligent Operation & Maintenance and Maintenance-Free Characteristics

• Core Advantage of Maintenance-Free: IP54 (NEMA 3R) protection grade, excellent internal sealing performance, no external wearing parts, design life of more than 25 years, no regular maintenance required for daily operation, which greatly reduces the operation and maintenance cost and is suitable for unattended power distribution scenarios (e.g., data centers, photovoltaic power stations).
• Optional Intelligent Monitoring: It supports customized functions such as online oil chromatography monitoring, real-time oil temperature/winding temperature monitoring and iron core grounding current monitoring. The data can be remotely transmitted to the control center to realize real-time perception of equipment status and support "condition-based maintenance" instead of traditional "regular maintenance".
• Key Points of Daily Inspection: Only need to regularly check the equipment appearance, grounding condition and integrity of the protective cover plate; for outdoor equipment, clean the surface debris to ensure good heat dissipation; the FR3 vegetable oil version does not require regular oil change, only need to test the oil quality every 5 years.

IV. Summary Table of Core Selection and Schemes

V. Summary

As a sophisticated product with 30 years of professional manufacturing experience, Hengfengyou 112.5kVA three-phase pad mounted transformer follows the core principle of "standardized design, scenario-based adaptation and maintenance-free operation". It covers global energy efficiency and standard requirements in the selection stage, adapts to flexible layout in multiple scenarios in the installation stage, and achieves optimal cost with high protection and long service life in the operation and maintenance stage. The product has passed global multi-dimensional certifications and been sold to dozens of countries and regions such as the United States, Australia, Japan and Southeast Asia. It supports OEM/ODM customized services and can perfectly match the power distribution needs of high-reliability power supply scenarios such as subway stations, airports, hospitals, data centers and photovoltaic power generation. Relying on the core advantages of high efficiency, environmental protection and reliability, it provides global users with life-cycle power distribution solutions.

VI. 112.5 KVA Three Phase Pad Mounted Transformer FAQ

1. What are the applicable scenarios of the 112.5kVA three-phase pad mounted transformer?A: It is mainly suitable for medium and large power supply scenarios requiring high reliability and low maintenance such as subway stations, airports, hospitals, data centers, photovoltaic power stations, industrial parks and commercial complexes, and can be flexibly adapted to outdoor, indoor and semi-outdoor installation environments.
2. Can the voltage grade of the 112.5kVA three-phase pad mounted transformer be customized?A: Yes. The basic primary voltage covers 2400V-46000V and the secondary voltage covers 120V-24940V. The specific voltage value and tap changer gear can be customized according to the user's power grid operating conditions to meet the power grid requirements of different regions.
3. What are the advantages of the FR3 vegetable oil version compared with the traditional mineral oil version?A: The FR3 vegetable oil version has a biodegradation rate of more than 95%, which is environmentally friendly and pollution-free with no leakage risk; it has greatly improved fire performance, suitable for indoor/underground scenarios with strict fire protection requirements; moreover, it does not require regular oil change, further reducing the operation and maintenance cost, and the service life of insulating paper can be extended several times.
4. Does the 112.5kVA three-phase pad mounted transformer support certifications for different global markets?A: Yes. The product has passed the full-dimensional certifications of ISO, CE, IEC, CSA and UL. FM Global (indoor/outdoor) and UL/cUL cover most ratings, complying with the core global standards such as ANSI, IEEE and IEC, and can directly enter major markets such as the United States, East Asia, Southeast Asia and Australia.
5. Does the installation of the 112.5kVA three-phase pad mounted transformer model require a dedicated site?A: No. The product adopts a compact integrated design and can be directly installed on outdoor concrete foundations, indoor equipment rooms or container-type power distribution rooms. It is small in volume and light in weight, and can be installed in narrow spaces with simple wiring and seamless connection with the power distribution system.
6. What is the design life of the product and what should be paid attention to in daily maintenance?A: The design life is more than 25 years, and the IP54 (NEMA 3R) high protection grade realizes maintenance-free operation; daily maintenance only needs to regularly check the equipment appearance and grounding condition, and clean the surface debris without regular disassembly and maintenance, and it can operate stably even in unattended scenarios.
7. Can it be adapted to new energy grid connection scenarios such as photovoltaic power generation?A: Yes. The impedance parameters and protection configuration can be customized according to the load characteristics of photovoltaic power generation to improve grid connection compatibility. It also supports intelligent monitoring functions, which can realize linkage control with the new energy power distribution system and meet the high reliability requirements of photovoltaic grid connection.
8. Does Hengfengyou provide OEM/ODM services and overseas technical support?A: We provide full-process OEM/ODM customized services, which can customize the appearance, parameters and certifications according to user needs; at the same time, we have a complete overseas service system to provide global users with technical support such as equipment installation guidance, commissioning and after-sales maintenance.
9. What standard does the operating noise of the product comply with, and is it suitable for noise-sensitive scenarios?A: The product strictly complies with the NEMA TR-1 sound level standard with low operating noise, and can be directly installed in noise-sensitive scenarios such as airports, hospitals and the surrounding areas of residential communities without additional sound insulation equipment.
10. Can the 112.5kVA three-phase pad mounted transformer model be operated in parallel in the dual-circuit redundant power supply scenario?A: Yes. The 112.5kVA model supports parallel operation of multiple units. The voltage ratio, impedance, phase and other parameters will be strictly matched before delivery to ensure the stability of parallel operation, meeting the core needs of dual-circuit redundant power supply scenarios such as hospitals and data centers.