| Oil Immersed Electric Transformer Accessories: |
| Accessories Can Be Customized According To Your Requirements |
| HV bushing(Primary bushings) | Radiator |
| LV bushing(Secondary bushings) | Oil tank |
| Tap Changer | Oil temperature indicator |
| Oil Level Indicator | Temperature detector |
| oil release valve | Pressure Relief Valve |
| Rating plat | Wheels |
| Earthing terminal | Lifting lugs |
| S13 type Oil-Immersed Distribution Transformer Parameters, Efficiency Level 3 |
| Rated Power(kVA) | High Voltage(V) | Low Voltage(V) | Connection Symbol | Loss(W) | Short Circuit Impedance (%) |
| No-load Loss | On-load Loss |
| 30 | 6 6.3 10 10.5 11 | 0.4 | Yyn0 Dyn11 | 80 | 630/600 | 4.0 |
| 50 | 100 | 910/870 |
| 63 | 110 | 1090/1040 |
| 80 | 130 | 1310/1250 |
| 100 | 150 | 1580/1500 |
| 125 | 170 | 1890/1800 |
| 160 | 200 | 2310/2200 |
| 200 | 240 | 2730/2600 |
| 250 | 290 | 3200/3050 |
| 315 | 340 | 3830/3650 |
| 400 | 410 | 4520/4300 |
| 500 | 480 | 5410/5150 |
| 630 | 570 | 6200 | 4.5 |
| 800 | 700 | 7500 |
| 1000 | 830 | 10300 |
| 1250 | 970 | 12000 |
| 1600 | 1170 | 14500 |
| 2000 | 1360 | 18300 | 5.0 |
| 2500 | 1600 | 21200 |
Customization Options – 30kVA Oil-Immersed Transformer
Tianya's 30kVA three-phase oil-immersed transformer can be fully customized to meet specific operational and environmental requirements. Available options include a choice of insulating oils—such as mineral oil or eco-friendly FR3—for enhanced sustainability and compliance.
The transformer can be equipped with an on-load tap changer (OLTC) to maintain stable output voltage under fluctuating load conditions. For enhanced safety and functionality, optional features include DMCR protection relays, surge arresters, and pressure relief devices.
To ensure long-term durability in harsh environments, corrosion-resistant coatings and weatherproof enclosures are also available. These flexible customization options make the transformer suitable for a wide range of demanding applications, combining reliability, safety, and efficiency.
Process Testing
Tianya's 30kva Oil Lmmersed Transformers undergo strict quality control throughout the manufacturing process. For the 30kVA model, process testing is conducted at various production stages to ensure compliance with all design and performance standards.
Key tests include verification of core insulation, winding resistance, and dielectric strength. Critical electrical components—such as bushings, tap changers, and protection devices—are also tested to confirm proper operation.
Additionally, the transformer is evaluated for its ability to withstand operational loads and voltage fluctuations. Any issues identified during testing are promptly corrected before final inspection. These rigorous process tests guarantee the transformer's safety, reliability, and compliance with industry standards under real-world operating conditions.
Design Testing
All transformers undergo a comprehensive series of design tests upon completion of production to verify performance and compliance with technical standards. The following test items are included:
· Insulation Power Factor
· Turns Ratio, Polarity, and Phase Relationship
· Winding Resistance
· Impulse Tests
· Load Loss Test (On-Load)
· No-Load Loss Test
· Leak Test
· DC Insulation Resistance Test
· Transformer Turns Ratio (TTR) – All Tap Voltages
· Impedance Voltage & Load Loss at Rated Voltage
· Polarity and Phase Relation (Single-Phase & Three-Phase)
· Excitation and No-Load Loss at Rated Voltage
· Applied Voltage Test
· Induced Voltage Test
· Lightning Impulse Test
· Insulation Resistance at Rated Voltage
· Temperature Rise Test
· Dielectric Withstand (Hi-Pot) Test
These rigorous tests ensure the transformer's electrical, thermal, and mechanical reliability under rated operating conditions.
Routine Test – Winding Resistance
| Category | Details |
|---|
| Purpose of Testing | To verify the continuity and connection quality of internal windings. Detects faults such as open circuits, poor contacts, or localized heating. |
| Testing Equipment | - Winding resistance tester (e.g., OMICRON, DV Power, Raytech, Megger, ISA)
- Test voltage source (6V, 10V, 20V, 40V, or 100V)
- Temperature & humidity meter |
| Pre-Test Preparation | - Ensure test instrument calibration
- Disconnect test object from external circuits
- Select appropriate voltage and set according to equipment specs |
| Test Procedure | Connect Equipment: Securely connect test leads to winding terminals and ensure proper grounding
Apply Voltage: Choose suitable test current based on winding type
Measure & Record: Document resistance (Ω), test voltage (V), current (A), and temperature before and after test |
| Temperature Correction | Convert measured resistance to standard reference temperature (usually 20°C) using a correction formula to ensure accurate comparison |
| Repeat Testing | Test each winding phase separately (HV, MV, LV) and record corresponding resistance values |
| Evaluation Criteria | - Deviation < 5%: Normal
- 5% ≤ Deviation < 10%: Warning
- Deviation ≥ 10%: Further inspection or corrective action required |
