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ZGS-H-1000
YAWEI
The 1000kVA 34.5kV/480V Oil Immersed Pad Mounted Distribution Transformer is an outdoor three-phase distribution transformer designed to connect a 34.5kV medium-voltage feeder with a 480V low-voltage distribution system.
Its 1000kVA capacity makes it suitable for electrical systems that require more than a small local distribution unit while remaining within the practical range of ground-mounted pad transformer installations. Typical applications include commercial properties, industrial facilities, utility distribution networks, institutional developments, infrastructure projects, and large electrical service areas.
The transformer is installed at ground level on a dedicated foundation or concrete pad. Its enclosed configuration is particularly suitable for projects using underground medium-voltage cables, where the transformer needs to be positioned close to the electrical load without constructing a dedicated indoor transformer room.
The oil immersed design provides dielectric insulation and heat transfer for the active components. The high-voltage and low-voltage compartments, terminals, protection components, enclosure, and accessories can be configured according to the project specification.
For North American projects, the final configuration should be coordinated with the utility's interconnection requirements, system grounding, fault level, insulation coordination, cable arrangement, protection scheme, and applicable transformer standards.
A 34.5kV/480V transformer occupies an important position between a medium-voltage distribution feeder and a facility's low-voltage electrical system.
For a project with a 34.5kV incoming supply, the transformer provides the voltage conversion required before power reaches 480V switchboards and utilization equipment.
The 1000kVA rating is also significant from a system-planning perspective. Instead of selecting transformer capacity solely from the connected load, engineers normally consider maximum demand, operating diversity, motor starting requirements, future expansion, transformer loading, and available electrical capacity.
This makes the product suitable for projects where a dedicated transformer is required to serve a defined load zone rather than a small residential service.
The 34.5kV primary side allows the transformer to connect directly to a medium-voltage distribution feeder.
This voltage level is relevant to utility, industrial, and private distribution systems where power is transmitted around the site at medium voltage before being transformed to a lower utilization voltage.
The high-voltage connection can be engineered for the required cable termination, switching arrangement, grounding configuration, and protection system.
The 1000kVA rating provides a substantial distribution capacity for commercial and industrial electrical loads.
The actual transformer loading should be evaluated against the site's demand profile rather than simply adding the nameplate ratings of all connected equipment.
Special consideration may be required for large motors, cyclic loads, nonlinear loads, harmonics, future expansion, and continuous operating conditions.
The 480V secondary provides a practical supply level for many commercial and industrial electrical systems.
Depending on the specified secondary connection, the transformer can serve low-voltage switchboards, motor loads, HVAC equipment, pumps, compressors, manufacturing machinery, and other compatible electrical equipment.
The exact secondary connection and neutral arrangement should be confirmed from the customer's single-line diagram.
Instead of occupying space inside an electrical room, the transformer is designed for ground-level outdoor installation.
A pad-mounted arrangement can be positioned close to the load center while allowing underground medium-voltage cables to enter the transformer enclosure.
The foundation, cable trench, working clearance, drainage, grounding, and access arrangement should be established during the civil and electrical design stages.
The pad-mounted enclosure can be arranged to separate the transformer and electrical connection areas according to the selected configuration.
This provides a defined working arrangement for high-voltage and low-voltage connections while helping protect internal components from direct environmental exposure.
The enclosure layout can be developed around cable entry direction, operating access, utility requirements, switching equipment, and protection components.
The oil immersed design uses insulating liquid around the core and windings to provide dielectric insulation and transfer heat during operation.
The thermal design is coordinated with the transformer's rated capacity and specified ambient conditions.
Depending on the project, the transformer can be engineered with the required tank, radiators, bushings, oil-level indication, pressure relief equipment, and other accessories.
The final configuration can incorporate protection and connection equipment appropriate to the electrical system.
Possible arrangements include:
High-voltage fuse systems
Load-break switching where specified
Current-limiting fuses where required
Low-voltage terminal arrangements
Grounding provisions
Pressure relief equipment
Oil-level indication
Temperature indication
Dead-front or live-front connection arrangements where applicable
Monitoring interfaces
Utility-specific protection components
The actual configuration should be determined from the project single-line diagram and utility specification.
Before ordering a 1000kVA 34.5kV/480V pad mounted transformer, the following parameters should be confirmed:
| Parameter | Project Requirement |
|---|---|
| Rated Capacity | 1000kVA |
| Primary Voltage | 34.5kV |
| Secondary Voltage | 480V |
| Phase | Three Phase |
| Frequency | To be confirmed |
| Vector Group | To be confirmed |
| Impedance | To be confirmed |
| Cooling | Oil immersed / project specified |
| Insulating Fluid | To be confirmed |
| Tap Arrangement | To be confirmed |
| BIL / Insulation Level | To be confirmed |
| HV Connection | Cable / utility specified |
| LV Connection | Cable / busbar / project specified |
| HV Protection | To be confirmed |
| Enclosure | Outdoor pad mounted |
| Grounding | Project specified |
| Applicable Standard | IEEE / ANSI / IEC / Utility specification |
This checklist can help prevent specification gaps between the transformer manufacturer, electrical consultant, EPC contractor, and utility.
A typical application can be understood as:
34.5kV Utility or Private Feeder
↓
Medium-Voltage Cable / Switching Equipment
↓
1000kVA Pad Mounted Transformer
↓
480V Low-Voltage Switchboard
↓
Motors / HVAC / Pumps / Commercial Loads / Industrial Equipment
This arrangement allows the higher distribution voltage to be used before the final step-down point, while the transformer provides the required low-voltage supply close to the end-use loads.
The actual network configuration depends on whether the project uses radial feed, loop feed, primary metering, secondary distribution, or another utility-approved arrangement.
Shopping centers, office complexes, hotels, mixed-use developments, and large commercial properties can use a 1000kVA 34.5kV/480V transformer to establish a dedicated low-voltage distribution point.
The outdoor configuration can preserve valuable indoor electrical-room space and support underground utility connections.
Factories and industrial buildings may use the transformer to supply 480V production equipment, motors, pumps, compressors, HVAC systems, and auxiliary electrical loads.
The 1000kVA rating should be evaluated against the facility's maximum demand and expected expansion.
For utility networks, the transformer can serve as a step-down point between a 34.5kV feeder and a customer or local low-voltage distribution system.
Utility requirements may determine the enclosure arrangement, primary protection, connection configuration, metering, grounding, and applicable testing requirements.
Campuses, schools, hospitals, municipal facilities, and other large sites may require dedicated outdoor transformers to serve defined electrical load areas.
The final transformer arrangement should take into account the facility's continuity requirements and electrical protection coordination.
Water treatment facilities, transportation infrastructure, telecommunications facilities, and remote industrial sites can also use pad-mounted transformers where ground-level outdoor installation is preferred.
Selecting a 1000kVA pad mounted transformer should involve more than confirming the kVA rating.
Determine the present maximum demand and expected future load. Pay particular attention to large motor loads and equipment with high starting current.
Confirm that the transformer primary voltage, insulation level, BIL, grounding arrangement, and connection method match the 34.5kV feeder.
Confirm whether the required 480V system is 480Y/277V or another connection arrangement. This point should be clearly identified on the single-line diagram.
The available short-circuit current at the installation point should be established before finalizing transformer impedance and protection equipment.
If the transformer will be connected to a utility network, the utility's transformer specifications should be obtained before manufacturing.
These may affect primary protection, switching, grounding, enclosure construction, testing, and documentation.
Ambient temperature, altitude, pollution, humidity, coastal exposure, accessibility, drainage, and available foundation space can influence the final transformer design.
A pad-mounted transformer should be installed on a suitable foundation with adequate clearance around the enclosure.
The surrounding area should remain accessible for inspection and maintenance, and vegetation or stored materials should not obstruct access or cooling surfaces.
Routine inspection can include:
Enclosure condition
Door and locking mechanism
Oil level
Oil leakage
Bushings
Cable terminations
Fuse condition
Grounding connections
Temperature indicators
Pressure relief equipment
Corrosion
Abnormal noise or vibration
Before maintenance, the transformer must be isolated, de-energized, discharged, and grounded according to the applicable electrical safety procedure.
A 1000kVA pad mounted transformer is a ground-level outdoor transformer designed to step medium-voltage electrical power down to a lower distribution voltage. This model is specified for a 34.5kV primary and 480V secondary system.
A 34.5kV distribution system allows electrical power to be delivered at medium voltage before being transformed near the load. This can be suitable for utility, industrial, and large commercial distribution networks.
480V is commonly used in industrial and commercial electrical systems for three-phase equipment, motors, HVAC systems, pumps, and other loads. The exact secondary connection should be confirmed according to the project's equipment and electrical design.
Yes. Pad-mounted transformers are commonly arranged for underground medium-voltage cable connections. The cable termination and compartment arrangement should be confirmed during engineering.
A pad-mounted transformer is designed for outdoor ground-level installation, so it does not normally require an indoor transformer room. However, the installation must still comply with applicable electrical clearances, access, fire-safety, utility, and site requirements.
Yes. The transformer can be engineered around utility requirements, including primary connection, protection, grounding, enclosure configuration, metering interfaces, testing, and documentation.
Yes. Parameters such as vector group, impedance, tap arrangement, insulation level, BIL, cooling configuration, winding material, primary protection, secondary terminals, enclosure design, and monitoring equipment can be specified according to the project.
The most useful information includes rated capacity, primary voltage, secondary voltage and connection, frequency, vector group, impedance, tap requirements, BIL, installation altitude, ambient temperature, utility requirements, primary protection, cable arrangement, applicable standards, and required accessories.
