zishengelectric
Project Partners
Phone/WhatsApp: 8619131285373
Email: info@zishengtransformer.com
Factory Headquarters: No. 118, Jingyi Street, Economic Development Zone.
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Project Partners
Phone/WhatsApp: 8619131285373
Email: info@zishengtransformer.com
Factory Headquarters: No. 118, Jingyi Street, Economic Development Zone.
The 15kVA single phase pad mounted transformer provides a ground-level supply point for underground distribution. It is intended for compatible single-phase residential, small commercial and local utility loads. Zisheng Electric can review the service voltage, cable interfaces and site conditions against your procurement specification.
A 15kVA rating describes apparent power, not a guaranteed 15kW usable load in every application. Establish diversified demand, power factor, motor-starting current and future expansion before approving capacity.
The enclosed tank and cable compartment sit on an engineered foundation. Confirm base dimensions, cable entry openings, conduit positions and door access before concrete work begins. Allow working clearance for authorized utility personnel and keep the installation accessible for lifting and replacement.
Radial feed serves a terminal supply point. Loop feed provides additional primary cable interfaces for an incoming and outgoing circuit; switching and isolation capability depend on the actual equipment supplied. Neither arrangement establishes protection selectivity by itself. Specify dead-front termination interfaces, connector ratings and the utility grounding arrangement.
The magnetic core and winding assembly must suit the selected frequency, voltage ratio and loss requirements. Copper or aluminum windings can be reviewed as alternatives. The purchase specification should identify the conductor material and guaranteed electrical performance rather than assuming that material alone determines efficiency.
ONAN means Oil Natural Air Natural: oil circulates naturally inside the tank and heat dissipates to surrounding air without fans. Mineral oil is the fluid option. Natural ester requires confirmation of the insulation system, temperature limits and applicable cooling designation. Alternative cooling codes should not be treated as interchangeable accessories.
BIL means Basic Impulse Insulation Level. It describes lightning impulse withstand and must be coordinated with the winding voltage, connectors and surge protection. Select the high-voltage and low-voltage insulation levels separately.
Provide installation altitude, minimum and maximum ambient temperature, solar exposure, humidity, pollution and corrosion conditions. Higher altitude or demanding thermal conditions may require a revised design or rating assessment. Coastal locations require review of coating, enclosure material and external fittings. Evaluate flooding, drainage and foundation elevation at the site.
Identify the applicable IEEE/ANSI, CSA or IEC requirements in the enquiry, together with local utility specifications and any mandatory efficiency rule. Compliance, listing and certification are separate requirements and must be supported by documents covering the offered design.
Confirm rated voltage and frequency, winding polarity, primary taps, feed arrangement, insulating fluid, enclosure finish, fuse coordination and monitoring accessories in the approved schedule. An off-circuit tap changer requires de-energization and isolation before adjustment; do not assume on-load tap changing.
The residential distribution design calls for a compact ground-level transformer connected to an underground medium-voltage feeder. The service supplies household lighting, appliances and small air-conditioning equipment through a 120/240V single-phase network.
The principal requirements are enclosed cable connections, access for authorized utility personnel, compatible protection and a foundation layout coordinated with underground conduits.
| Parameter | Configuration |
|---|---|
| Rated capacity | 15 kVA |
| Phase | Single phase |
| Primary system | 12,470Y/7,200 V grounded wye |
| Primary winding voltage | 7,200 V, phase-to-neutral |
| Secondary service | 120/240 V, three-wire split-phase |
| Frequency | 60 Hz |
| Primary feed | Radial feed |
| Cooling | ONAN — natural oil circulation and natural air cooling |
| Installation | Outdoor concrete pad with underground cable entry |
The electrical design coordinates primary connectors, fuse characteristics, surge protection and grounding with the utility supply. Secondary conductor sizing accounts for service length, load demand and voltage drop. Motor starting and future electric heating or vehicle charging are reviewed separately from steady-state demand.
The foundation drawing aligns the cabinet base and cable entry openings with the underground conduit route. The installation layout allows door opening, cable bending, drainage and lifting access. The service neutral and grounding connections follow the approved electrical arrangement.
The procurement plan includes review of winding resistance, ratio and polarity, no-load loss and current, load loss and impedance, applicable dielectric tests and tank tightness. Acceptance uses the approved drawings, nameplate schedule and traceable factory test records.
Timber supports restrain the transformer through approved structural points. Bushings, terminals and projecting fittings remain clear of packing members. Before energization, the site team checks shipment condition, cable terminations, grounding continuity and the protection arrangement.
| Parameter | Specification |
|---|---|
| Rated capacity | 15 kVA |
| Phase | Single phase |
| Installation | Pad mounted; underground cable distribution |
| Secondary voltage | 240/120 V, 480/240 V, 277 V or project-specific rating; select one configuration. |
| Frequency | 50 Hz or 60 Hz, specified at order |
| Winding connection / polarity | Ii0 or Ii6 options |
| Winding material | Copper or aluminum, selected at order |
| Cooling | ONAN configuration; alternative fluid and cooling design subject to review |
| Insulating fluid | Mineral oil; natural ester optional subject to approved design |
| Primary feed | Radial or loop feed, selected at order |
| Primary taps | option: ±2 × 2.5%; confirm off-circuit tap arrangement |
| Impedance | nominal 2%; 1.1–5.75% custom range subject to engineering review |
| Losses and efficiency | Guaranteed values and applicable efficiency requirements to be agreed; no certified value supplied |
| Altitude | ≤1,000 m; higher altitude requires review |
| Tank material | Mild steel or 304 stainless steel option |
| Finish | ANSI 70 gray, Munsell green or agreed finish |
| Oil weight | 90 kg |
| Equipment total weight | 295 kg (excluding packaging) |
| Equipment dimensions (L × W × H) | 1,000 × 900 × 700 mm |
| Accessories | Project-selected fuse protection, switch, tap changer, bushings, grounding provisions, pressure relief and monitoring fittings; supply scope to be agreed |
Approve the foundation outline, cable entry positions, cabinet opening clearance, grounding points and lifting arrangement before site work. Confirm terminal identification and available fault current with the utility. Installation and commissioning must follow the approved instructions and local electrical requirements.
Support and secure the transformer through approved structural points. Keep packing members clear of bushings, connectors, gauges and operating handles. Protect the cabinet finish, restrain loose accessories and identify separately packed components on the packing list.
A secured pallet, timber frame or wooden crate may be selected according to the handling route and order requirements. Specify moisture protection and any applicable timber treatment. Confirm equipment dimensions and net weight separately from packed dimensions and shipping gross weight.
Use designated lifting points and handling equipment rated for the confirmed lifting weight. Coordinate container access, lifting clearances and restraints before dispatch. Delivery documents may include the packing list, approved datasheet, drawings, agreed test reports and handling instructions.
On arrival, inspect for impact damage, cabinet distortion, cracked bushings, coating damage and fluid leaks. Match serial numbers and accessories to the documents. Resolve damage or leakage before energization.
For the 15kVA single-phase pad-mounted transformer, the approved technical schedule establishes the inspection scope, electrical ratings and acceptance criteria. Zisheng Electric reviews the primary connection, secondary service, operating frequency, cable interfaces and protection arrangement before manufacture.
Check cabinet construction, door operation, base dimensions, cable entry openings, lifting provisions, grounding terminals and nameplate details against the approved drawings. Inspect accessible bushings, terminals, seals and fittings for damage, alignment and secure assembly. Confirm the supplied accessories and terminal identification against the order.
Temperature-rise, lightning-impulse, sound-level and other design or special tests are specified separately under the selected standard and contract. Their classification and acceptance criteria depend on that standard and the offered design; they are not automatically repeated on every transformer.
Factory Acceptance Testing (FAT) is the agreed acceptance process before shipment. Where witnessing is required, confirm the inspection and test plan, witness points, notification period and document package before production. Customer or third-party witnessing supplements the agreed inspection scope; it does not replace the routine test records.
Agree the required datasheet, outline and terminal drawings, nameplate schedule, unit-specific routine test report and handling instructions in the purchase order. Reports should identify the transformer serial number, tested configuration, test conditions, applicable limits and recorded results. Release for shipment follows resolution of agreed inspection points.
The routine test schedule for the 15kVA single-phase pad-mounted transformer follows the selected standard and approved order requirements. Measurements are assessed against the specified ratings and acceptance limits, with the test configuration and relevant temperatures recorded.
| Inspection or Test | Purpose and Record |
|---|---|
| Visual, dimensional and terminal checks | Verify the enclosure, base, nameplate, terminal markings, grounding provisions and supplied accessories against approved drawings. |
| Winding resistance | Check winding and connection consistency. Record winding temperature and apply the required reference-temperature correction. |
| Voltage ratio and polarity | Verify the primary-to-secondary voltage relationship, specified tap positions and single-phase terminal polarity, including the split-phase secondary arrangement where supplied. |
| No-load loss and excitation current | Measure magnetic-circuit performance at the specified voltage and frequency; compare results with the agreed limits. |
| Load loss and short-circuit impedance | Verify the electrical performance used for loss evaluation, voltage regulation and fault coordination, with temperature correction where required. |
| Applied-voltage and induced-voltage tests | Check insulation withstand using the procedures and test levels required by the selected standard and insulation design. |
| Tank tightness and seal inspection | Check applicable welds, seals, bushings and fittings using the agreed pressure, duration and leakage acceptance criteria. |
| Accessory and operating checks | Check supplied tap-changing, switching, indication and protection interfaces as applicable to the approved configuration. |
Confirm connector interfaces, terminal accessibility, identification and clearances against the approved installation arrangement. Electrical tests use the specified primary and secondary connection; optional voltage configurations are not treated as simultaneous ratings.
Request the routine test report for the supplied serial number. Check that the capacity, voltage ratio, frequency, tap position and measured results match the approved schedule. Lightning-impulse, temperature-rise and other separately specified tests belong to the agreed additional test scope.
For homes or small groups of dwellings where diversified demand fits 15kVA. Confirm utility primary voltage, split-phase service, service conductor sizing and future loads such as electric heating or vehicle charging.
For compatible single-phase lighting, office, refrigeration and service loads. Include compressor starting and simultaneous demand; the transformer does not directly supply three-phase equipment.
For single-phase lighting, controls and appropriately sized farm service loads reached by underground cable. Review pump starting, cable distance and voltage drop before selecting this capacity.
For new or replacement underground distribution points with modest single-phase demand. Specify radial or loop feed interfaces, utility connectors, fault duty, protection and foundation details.
It serves compatible single-phase loads through underground distribution cables. Confirm diversified demand, power factor and motor starting before selecting 15kVA. It does not directly supply a three-phase load.
options include 240/120V split-phase, 480/240V and 277V. Provide the utility primary voltage, connection, secondary wire arrangement and frequency so one compatible configuration can be confirmed.
Choose according to the utility network layout and cable interfaces. Loop feed provides incoming and outgoing primary connections; load switching and isolation depend on the specified switch and connectors.
Provide altitude, ambient temperatures, flooding exposure and corrosion conditions. The altitude is up to 1,000m; higher elevations or severe environments require design review.
Agree fuse coordination, surge protection, primary connectors, grounding, available fault current and the foundation drawing. Confirm cabinet access and cable bend space before installation.
Agree the inspection plan and required reports before manufacture. Routine electrical and mechanical checks follow the selected standard; impulse, temperature-rise and witnessed FAT requirements must be identified separately. Ask for certification documents covering the actual offered design.
15kVA Single Phase Pad Mounted Transformer
