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ZGD-H-167
YAWEI
The ZGD-H 167kVA Single Phase Oil Immersed Distribution Transformer 34.5kV to 120/240V is designed for utility and customer-side power distribution systems requiring single-phase voltage transformation from a 34.5kV medium-voltage network to a 120/240V low-voltage service supply. Its configuration is well suited to overhead distribution systems, rural electrification projects, residential power supply, and other applications where single-phase distribution is preferred.
The transformer uses an oil immersed construction to provide electrical insulation and thermal management for the internal core and winding assembly. A laminated grain-oriented electrical steel core is used to help control excitation losses, while the winding structure is mechanically supported to withstand the electrical and mechanical stresses associated with distribution service.
With a 167kVA rated capacity, the transformer is suitable for supplying residential customers, farms, small commercial facilities, remote installations, and other distributed loads. The 34.5kV primary voltage allows connection to higher-voltage utility distribution networks, while the 120/240V secondary configuration provides a conventional split-phase service arrangement for low-voltage consumers.
The transformer can be engineered with an impedance range of approximately 1.5% to 4.5%, depending on the final design and project requirements. Other parameters, including insulation level, bushing arrangement, tank configuration, conductor material, mounting method, protection accessories, and applicable standards, can be customized for specific utility or project specifications.
The ZGD-H transformer is specifically configured for single-phase distribution applications rather than being a reduced version of a three-phase unit.
Its electrical design is optimized for the requirements of single-phase utility service, making it suitable for individual service areas, rural networks, residential loads, farms, and other locations where single-phase power distribution is required.
The transformer converts 34.5kV medium-voltage power to a 120/240V low-voltage service supply.
This voltage combination provides a practical interface between utility distribution feeders and low-voltage customer loads. The 120/240V secondary arrangement can accommodate common residential and small commercial electrical loads when coordinated with the appropriate service and grounding configuration.
The oil immersed structure provides both dielectric insulation and heat transfer for the active components.
During operation, heat generated by the core and winding assembly is transferred through the insulating oil to the transformer tank and surrounding environment. This established construction is widely used for outdoor distribution equipment where simple thermal management and long-term serviceability are required.
The transformer core uses grain-oriented electrical steel with an optimized magnetic circuit to help reduce no-load losses and maintain stable excitation characteristics.
Controlled core construction also contributes to reduced operating noise and improved overall efficiency under normal distribution conditions.
The transformer can be designed within an approximate 1.5%–4.5% impedance range according to the required electrical characteristics.
Impedance selection can affect voltage regulation, fault current, and system coordination, so the final value should be determined according to the utility network and project protection requirements.
The transformer can be configured for outdoor installation and exposure to changing environmental conditions.
The tank, bushings, terminals, protective coating, and sealing components can be selected according to the required ambient temperature, humidity, pollution level, corrosion conditions, and installation environment.
The transformer can be supplied with accessories and terminal arrangements appropriate for utility distribution projects.
Depending on the specification, available configurations may include:
High-voltage bushings
Low-voltage bushings
Neutral connection
Lightning arresters
Oil level indication
Pressure relief device
Drain and sampling valve
Grounding terminals
Nameplate
Lifting and mounting provisions
Optional fuse protection
Optional surge protection
The final configuration is determined by the approved technical specification.
YAWEI can customize the transformer according to the customer's distribution network and installation requirements.
Possible engineering variables include:
Rated capacity
Primary voltage
Secondary voltage
Impedance
Frequency
Insulation level
BIL
Winding conductor material
Tap arrangement
Bushing type
Mounting configuration
Protection accessories
Utility-specific requirements
Applicable ANSI/IEEE or IEC standards
>> Technical Parameters
| Type | Single phase pad mounted transformer |
| Model | ZGD |
| Installation | Outdoor |
| Altitude | ≤1000m |
| Rated Power | 100KVA or others |
| Cooling Method | ONAN |
| Primary Voltage | 8320 GrdY/4800 or others (customizable) |
| Secondary Voltage | 240/120V or others (customizable) |
| Rated Frequence | 60HZ |
| Insulation oil | Mineral oil |
| Tapping Range | +2×2.5% |
| Temperature rise C | 65 |
| Connection Group | lio |
The 34.5kV to 120/240V configuration is suitable for residential distribution systems where individual or localized loads require single-phase service.
The transformer can supply homes and residential clusters while connecting them to a higher-voltage utility feeder.
The transformer can be deployed in rural areas where distribution lines extend over relatively large service territories and individual single-phase loads are distributed along the feeder.
Its compact single-phase configuration makes it suitable for decentralized power supply applications.
Farms, irrigation facilities, agricultural buildings, livestock facilities, and other rural electrical installations may require reliable single-phase service.
The transformer can convert utility medium voltage into 120/240V power for lighting, pumps, agricultural machinery, ventilation systems, and auxiliary equipment.
The transformer can be integrated into overhead distribution systems where medium-voltage conductors are routed along utility poles and low-voltage service is supplied to individual customers.
Its single-phase configuration allows utilities to deploy distribution capacity according to localized load requirements.
Remote homes, telecommunications sites, small facilities, and isolated electrical loads may require a dedicated single-phase distribution transformer.
The 167kVA rating provides additional capacity compared with smaller residential distribution units and can accommodate higher localized demand when appropriately engineered.
The transformer can also be used for workshops, stores, offices, agricultural businesses, and other small commercial premises requiring 120/240V single-phase service.
The final application should be evaluated according to the customer's connected load, demand factor, starting current, and utility service requirements.
The following information provides general guidance for transportation, installation, commissioning, operation, and maintenance of the ZGD-H 167kVA 34.5kV to 120/240V Single Phase Oil Immersed Distribution Transformer.
All high-voltage installation and maintenance work must be carried out by qualified personnel. The manufacturer's approved drawings, technical specifications, factory test documents, applicable standards, and local electrical regulations shall take precedence over this general guide.
Transport the transformer using suitable lifting and handling equipment.
Keep the unit in the manufacturer's recommended position and protect it from severe impact, excessive vibration, collision, and uncontrolled movement during transportation.
Use only the designated lifting points when handling the transformer.
After arrival, inspect the transformer for possible transportation damage.
Check:
Tank condition
Oil leakage
Bushings
Terminals
Grounding points
Protective coating
Accessories
Nameplate
Mounting components
Compare the received equipment with the packing list and approved technical documentation.
If the transformer cannot be installed immediately, place it in a suitable location protected from unnecessary moisture, contamination, and physical damage.
Keep bushings and external accessories protected until installation.
Install the transformer according to the approved utility or project drawings.
For pole-mounted applications, verify that the supporting structure, mounting hardware, clearances, and mechanical loading capacity are suitable for the transformer's weight and installation configuration.
Maintain appropriate electrical clearance around high-voltage and low-voltage components.
Connect the transformer tank and designated grounding points to the site grounding system.
The grounding arrangement must comply with the project design and applicable electrical regulations.
Connect the 34.5kV primary side according to the approved electrical drawings.
Verify the phase identification, bushing arrangement, conductor connections, clearances, grounding, and protection equipment before energization.
Connect the 120/240V secondary terminals according to the transformer nameplate and approved wiring diagram.
Check the neutral connection and grounding arrangement carefully before applying power to the low-voltage system.
Before energization, verify:
Oil level
Bushing condition
Terminal connections
Grounding
Protection devices
Mounting hardware
Nameplate information
Tap position where applicable
Insulation condition
Any abnormal condition should be investigated before the transformer is energized.
Depending on the project requirements, commissioning tests may include:
Insulation resistance
Winding DC resistance
Transformer turns ratio
Polarity verification
Dielectric testing
Grounding continuity
Protection-device checks
Test results should be compared with factory test data and applicable technical requirements.
After completing the required inspections and tests, energize the transformer according to the approved commissioning procedure.
During initial operation, observe secondary voltage, load current, oil level, temperature, unusual noise, vibration, and protection indications.
During service, periodically monitor the transformer's load and operating condition.
Avoid exceeding the specified rated capacity unless a qualified engineering assessment has confirmed that the proposed operating condition is acceptable.
Regular inspection may include:
Oil level
Oil leakage
Bushing condition
Tank condition
Grounding connections
Terminal connections
Corrosion
Temperature
Surge protection
Mounting hardware
Maintenance intervals should be established according to the manufacturer's recommendations, utility requirements, environmental conditions, and operating history.
Where required, inspect or test the transformer oil according to the applicable maintenance standard.
Oil samples should be collected using appropriate procedures to avoid contamination and inaccurate test results.
Before performing maintenance, isolate the transformer from all electrical sources.
Apply appropriate lockout/tagout procedures, verify the absence of voltage, and establish protective grounding as required by the applicable safety procedure.
Never perform maintenance on an energized transformer.
Replacement parts should match the original technical requirements.
After replacing bushings, protection devices, terminals, gauges, or other components, perform the required mechanical and electrical checks before returning the transformer to service.
Important: This operation guide provides general information only. Actual installation, commissioning, operation, maintenance, and repair must follow the manufacturer's approved drawings, technical documentation, applicable utility requirements, and local electrical safety regulations.
