• Product advantages
• Product parameters
• Ordering instructions

Product advantages

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Why Choose Our 75KVA  Three Phase Pad Mounted Transformer?
Leading Technology
• Fully enclosed & insulated structure – safe and reliable operation
• Low loss, low noise, low temperature rise
• High overload capacity & strong short-circuit withstand capability

Flexible System Integration
• Supports terminal system or ring network system
• Easy configuration switch – improves power supply reliability

Heavy-Duty Enclosure
• Material: cold-rolled, hot-dip galvanized steel
• Laser-cut CNC drilled and bent panels
• Electrostatic spray coating –30 years paint life
• Core unit: low loss oil-immersed transformer from Hengfengshuai Electric

Precision Manufacturing
• Assembly technicians: minimum 6 months training
• Secondary wiring: automatic cutting for reliable connection
• Bolt tightening: power tools with precise torque control
• Copper busbar: CNC punched and bent
• 100% pre-delivery testing


Company Advantages – Built for Global Buyers
• Certifications |ISO, CE, CB, UL |
• Quality System | SQA management – guaranteed consistency |
• Fast Response | Quick quote + electrical design support |
• Delivery | Short lead time, worldwide shipping |
• After-Sales | Complete service system |
• Customization | OEM/ODM – factory visit welcome |


75KVA  Three Phase Pad Mounted Transformer FAQ

1. Standard & Certification

Q1: What industry standards do your 75kVA pad-mounted transformers comply with? Are they suitable for North American and global municipal grid access?
A1: Our 75kVA three-phase pad-mounted transformers are primarily designed and tested per ANSI/IEEE C57.12 series, CSA C227.4, and DOE 2016 energy efficiency standards, which are core specifications for North American municipal power distribution. Meanwhile, they fully comply with IEC 60076, GB, EN and AS/NZS standards to adapt to global markets. Different from traditional substation transformers, this model meets urban public safety power distribution codes. We can conduct targeted standard verification according to project location and provide complete certification files for local grid approval and municipal engineering acceptance.
Q2: Can you provide DOE efficiency certification and third-party full test reports? Is field witnessed inspection supported?
A2: We provide official DOE energy efficiency certification, CNAS-accredited full type test reports and third-party test reports covering loss parameters, insulation performance, mechanical strength and safety protection. For municipal grid projects, residential community and commercial park supporting projects, on-site witnessed factory tests and field acceptance inspections are available. All test data strictly follows low-capacity pad-mounted transformer industry thresholds to ensure compliance with local power bureau access standards.
Q3: What technical documents are included in delivery? Can you provide multi-language municipal engineering manuals?
A3: The standard delivery package includes English-version municipal-grade technical documents: equipment nameplate, pad installation layout drawing, foundation embedding drawing, low-voltage wiring schematic, FAT test report, operation and maintenance manual for outdoor pad-mounted equipment, and spare parts list. We support customized Spanish, Portuguese, Arabic and French manuals, which are tailored for urban municipal construction, property operation and overseas engineering team use, with simpler and more practical operation guidelines compared with industrial high-voltage transformers.

2. Technical Performance & Structural Features

Q4: What winding options are available for 75kVA pad-mounted transformers? Can material performance be guaranteed for long-term outdoor operation?
A4: This 75kVA model supports high-purity anaerobic copper windings and high-temperature resistant aluminum windings, which are mainstream configurations for outdoor pad-mounted distribution transformers. The winding material and performance parameters can be clearly stipulated in contracts and technical agreements, with complete material test certificates and production traceability records. Optimized low-capacity winding structure reduces no-load loss effectively. Matched with F/H-class insulation system, it adapts to long-term outdoor temperature changes and ensures stable operation for urban distribution scenarios.
Q5: Can voltage grade and electrical parameters be customized for municipal and commercial scenarios? How to handle unqualified products?
A5: Core parameters support personalized customization for scenario demands: common primary voltage 11kV/13.2kV/13.8kV, secondary voltage 400V/480V/208Y/120V, matching global residential and commercial power supply standards. No-load loss, load loss and impedance values can be adjusted to meet municipal grid energy-saving requirements. All products pass 100% full-item factory testing. Unqualified equipment will be reworked or replaced free of charge, and will never be delivered to ensure on-site power supply reliability.
Q6: Can the 75kVA pad-mounted transformer adapt to outdoor complex environments such as coastal areas, high temperature, humidity and urban seismic zones?
A6: As an outdoor fully sealed pad-mounted device, it has inherent excellent environmental adaptability. We provide targeted optimization schemes: C5M high-grade anti-corrosion electrostatic spraying for coastal salt spray and industrial pollution areas; high-temperature insulation upgrade for tropical high-temperature regions; fully sealed waterproof and moisture-proof structure to prevent rainwater and dust intrusion; integral reinforced base and shock-absorbing structure for urban seismic and road vibration environments. All designs focus on long-term outdoor unattended operation.
Q7: Is this transformer applicable for distributed photovoltaics, community power supply and commercial building grid-tie? How about harmonic resistance?
A7: This 75kVA pad-mounted transformer is specially optimized for small and medium-sized distributed energy and civil power distribution scenarios. The optimized core magnetic circuit design can effectively suppress harmonic interference generated by small photovoltaic systems, commercial electrical equipment and household loads, reduce harmonic heating and voltage waveform distortion. It perfectly adapts to intermittent power output of distributed PV and complex civil load fluctuations, ensuring stable grid-tie and power supply quality.
Q8: What is the standard noise level? Is low-noise configuration available for residential areas and parks?
A8: Benefiting from low-capacity optimized structure and silent damping design, the standard operating noise is ≤50dB under IEC test conditions, far lower than industrial high-power transformers. For core noise-sensitive scenarios such as residential communities, urban parks and school districts, we provide upgraded ultra-low-noise design (≤45dB), adopting integral vibration damping base, silent core fixation and noise reduction baffle structure, and can provide official noise test certificates for urban environmental acceptance.
Q9: Does the equipment have lightning protection and short-circuit resistance for outdoor urban grid operation?
A9: The 75kVA pad-mounted transformer is equipped with standard outdoor lightning impulse protection design and built-in overvoltage protection devices, which can resist lightning strikes and switching overvoltage in open outdoor environments. The reinforced anti-short-circuit winding structure effectively copes with short-circuit faults caused by urban line aging and load abnormalities. It meets municipal grid safety operation standards, and complete lightning impulse and short-circuit resistance test reports can be provided.
Q10: What is the design service life? How does insulation system ensure long-term outdoor operation?
A10: The standard design service life of outdoor pad-mounted transformers is 25 years, longer than traditional industrial transformers. Adopting high-stability oil-paper composite insulation and strictly following the 6℃ insulation ageing rule, with sufficient temperature and ageing margin reserved for outdoor variable temperature environments. With routine inspection and oil maintenance, the actual service life can reach 30 years, fully adapting to long-term unattended outdoor municipal operation.
Q11: Are you a professional manufacturer of pad-mounted transformers? What are your product advantages?
A11: We are a professional manufacturer focusing on outdoor pad-mounted distribution transformers for municipal and civil scenarios, with years of export experience in North America, Southeast Asia and Middle East municipal projects. All core processes are independently produced in-house, specializing in low-capacity outdoor sealed transformer customization and production. Our products feature compact structure, safety, low noise and strong environmental adaptability, widely used in urban communities, commercial parks, scenic spots and distributed energy projects, and support factory audits and third-party inspections.

3. Customization, Dimension & On-site Installation

Q12: Can you customize non-standard 75kVA pad-mounted transformers for special municipal scenarios?
A12: Full non-standard customization is supported for scenario-based demands. Customizable contents include multi-region voltage matching, special color spraying for urban landscape coordination, anti-theft and tamper-proof door lock structure, IP protection grade upgrade, foundation size optimization, and special low-temperature/high-temperature adaptation. Key accessories can be equipped with customer-specified international brands. All customized requirements will be confirmed in a formal technical agreement to match on-site municipal construction standards.
Q13: Can you provide foundation dimension drawings and overall weight data? Is the equipment convenient for on-site hoisting and cross-border transportation?
A13: We provide accurate overall dimension drawings, foundation embedding drawings, installation spacing drawings and net/gross weight data together with the quotation. Different from large industrial transformers, the 75kVA pad-mounted transformer has small volume and light weight, no oversized and overweight problems. It supports integral hoisting and one-time on-site installation, and is fully adaptable to sea freight, railway and road cross-border transportation with no special transportation risk assessment required.
Q14: What is the export packaging mode for outdoor pad-mounted transformers?
A14: Adopting professional outdoor equipment export packaging: full oil-sealed integral packaging for short-distance transportation, realizing on-site direct placement and quick power transmission; for long-distance ocean transportation, oil-drained nitrogen-filled protection + shockproof wooden box packaging is adopted, equipped with impact recorders to monitor transportation vibration, effectively protecting sealed structure and internal components, avoiding moisture and collision damage during long-term transit.

4. Production & FAT Acceptance

Q15: What is the production cycle of 75kVA pad-mounted transformers? How to ensure on-time delivery for municipal projects?
A15: The production cycle of standard 75kVA pad-mounted transformers is 12–20 working days, shorter than high-power industrial transformers. For customized landscape type, special environment adaptation models and batch municipal project orders, the cycle is 20–30 working days. The delivery schedule is clearly specified in the contract. We regularly update production progress photos and test reports, and adopt priority scheduling for municipal key projects to ensure on-time delivery and meet construction progress requirements.
Q16: Can customers or third-party institutions witness factory FAT acceptance?
A16: We fully support customer on-site inspection and FAT witnessing, and recognize third-party authoritative institutions such as SGS and BV for factory verification. We will coordinate the production and test schedule in advance, provide complete production process records, raw material certificates and full test data, and ensure the acceptance process is transparent and compliant with municipal project bidding and acceptance specifications.
Q17: Are core components traceable? Are key processes outsourced?
A17: All core components (core, winding, insulating oil, sealed bushing, protection device) have complete batch traceability records and qualification certificates. Core production processes such as winding, insulation wrapping, sealing assembly and overall testing are independently completed in our factory without outsourcing, ensuring consistent product quality and stable outdoor operation performance.

5. Quotation, Payment & Customs Clearance

Q18: How long is the quotation valid? Will the price fluctuate with raw materials?
A18: The standard quotation validity period is 15 days with fixed price. For batch municipal project orders and long-term cooperative projects, the quotation validity can be extended to 120 days. The price is stable in the short term, and the expired quotation will be updated according to the latest raw material market price.
Q19: What payment terms are supported? Is L/C payment acceptable for engineering projects?
A19: We support flexible international payment methods including TT telegraphic transfer and irrevocable sight L/C. The advance payment ratio and installment terms can be flexibly negotiated according to order quantity and project nature. All commercial terms are written into formal export contracts to protect the legitimate rights and interests of both parties, adapting to the payment habits of overseas engineering companies and municipal procurement projects.
Q20: Can you provide preferential certificate of origin for tariff exemption?
A20: We can provide complete customs clearance documents such as CO certificate of origin, FORM E and FORM A, which help customers apply for destination country tariff reduction and exemption, reduce project procurement costs, and ensure smooth and efficient cross-border customs clearance of municipal engineering equipment.

6. Packaging, Logistics & Insurance

Q21: Does the export packaging meet international sea freight standards? Is it suitable for long-term overseas transportation?
A21: All packaging adopts international export-grade anti-rust, moisture-proof, shockproof and weather-resistant treatment, specially designed for outdoor electrical equipment. The wooden boxes have IPPC fumigation marks, fully meeting international quarantine and sea freight standards. The sealed structure packaging can resist humid and salty sea climate, ensuring no damage to the equipment during long-distance ocean transportation.
Q22: What logistics solutions are available for small-capacity pad-mounted transformers?
A22: Combined with the small and lightweight characteristics of 75kVA equipment, we provide diversified efficient logistics schemes: sea freight for global bulk delivery; China-Europe railway for Eurasian urban municipal projects; truck transportation for neighboring countries and short-distance cross-border projects. The logistics cost is lower and the transportation cycle is shorter than that of large transformers.
Q23: What is the cargo damage claim process during transportation?
A23: All exported equipment is fully insured with transportation insurance. After the goods arrive, if there is packaging damage or equipment failure caused by transportation factors, customers only need to collect on-site photos, videos and waybill evidence within 48 hours and submit a claim application. We provide full set of contract, packing list and test documents to assist customers in completing claim settlement, subject to insurance policy and third-party assessment results.

7. SAT & On-site Commissioning Service

Q24: Do you provide overseas on-site installation guidance and municipal project commissioning services?
A24: We provide global one-stop on-site technical services for pad-mounted transformers, including foundation installation guidance, equipment positioning, wiring debugging, grid-tie testing and SAT on-site acceptance, with separate quotation for engineering services. Meanwhile, free 24/7 remote technical support is provided to solve on-site installation and operation problems quickly, ensuring rapid power transmission of municipal projects.

8. Warranty & After-sales Service

Q25: What is the warranty period and coverage for outdoor pad-mounted transformers?
A25: The standard warranty period is 1 year. For municipal grid, commercial park and batch engineering projects, the warranty period can be extended to 2–3 years. The warranty covers all manufacturing defects and original accessory quality faults. Failures caused by improper on-site operation, artificial damage, overload operation and unauthorized modification are excluded from the warranty scope.
Q26: Can you supply original spare parts after the warranty expires?
A26: We provide lifelong supply of original genuine spare parts for all sold 75kVA pad-mounted transformers, including sealed accessories, protection devices and wearing parts, ensuring long-term stable and safe operation of outdoor equipment and solving the problem of difficult after-sales matching of municipal equipment.
Q27: What is the response speed of technical support and after-sales service?
A27: We provide 24/7 online all-weather technical support, responding to conventional faults and technical consultation within 1 hour. For on-site maintenance demands, professional engineers can be arranged to arrive at the site within 7–12 working days according to the project region. For sudden power supply faults of municipal key projects, an emergency response mechanism will be activated to minimize power outage losses.
Q28: What is your factory quality control system for pad-mounted transformers?
A28: We implement full-process ISO quality management system, targeting the outdoor unattended operation characteristics of pad-mounted transformers, focusing on sealing performance, anti-corrosion performance and low-loss parameter control. Each equipment passes full-item factory tests including insulation, loss, noise and sealing performance before delivery. We support third-party factory audits and quality inspections by BV, SGS and other institutions to ensure product compliance with global municipal power distribution standards.

Product parameters

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Capacity: 75KVA Pad Mounted Transformer
Rated voltage: 10kV, 11kV, 13.8kV, 20kV, 33kV, 34.5kV,35kV;
Maximum operating voltage：38.5kV

Pad Mounted Transformer Technical Specification
RatedPower(KVA)	H.V(KV)	L.V（V）	Loss(W)		Dimension（CM）			Weight(KG)
			No-loadLoss (W)	On-loadLoss (W)	W	D	H	Oil   Weight	Total  Weight
75KVA	34.5KV 19.92KV 13.8KV 13.2KV 7.62KV 12.47KV 7.2KV	240V480V4 80Y/277V 600Y/347V	180	1250	1390	910	1430	120	645
112.5KVA			200	1500	1420	920	1430	138	729
150KVA			280	2200	1510	980	1530	201	989
225KVA			400	3050	1600	1000	1660	230	1195
300KVA			480	3650	1660	1080	1680	260	1415
500KVA			680	5100	1810	1160	1790	325	1905
750KVA			980	7500	2030	1300	2030	535	2755
1000KVA			1150	10300	1651	1549	1854	650	3235
1500KVA			1640	14500	2210	1470	2150	748	5835
2000KVA			2160	20645	2380	1600	2220	950	6430
2500KVA			2680	27786	2480	1650	2330	1020	8865

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

Ordering instructions

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When ordering, the customer should provide the following information:
• Main loop scheme diagram and secondary loop system diagram.
• Electrical schematic diagram of auxiliary circuit and wiring terminal layout
• Equipment layout drawing, combination drawing, floor plan drawing.
• Brand, model, specification and quantity of main electrical components of the equipment.
• Incoming and outgoing lines and cable specifications.
• Equipment surface color (RAL chromatography).
• Other special requirements can be negotiated with Hengfengshuai Electric