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The 300kVA oil-immersed substation transformer is a core distribution equipment for small and medium-capacity single-phase substations. Featuring a fully sealed oil-immersed insulation and a substation-grade highly efficient cooling system, oil filled substation transformer combines low loss and reliable insulation with high stability and robust protection. Oil filled substation transformer is ideal for community substations, rural town substations, and small industrial or commercial park substations. It operates reliably in standard climates (-25℃ to 40℃) to precisely meet single-phase power transmission needs.
Core Parameters:
• Energy Efficiency: Tier 2 Efficiency (Complies with GB 20052-2024).
• Structure: Fully Sealed Tank + Substation-Grade Cooling System.
• Warranty: 3-Year Standard Warranty.
Product Features
A specialized high-efficiency cooling system provides a large, uniform heat dissipation area. It perfectly adapts to the continuous operational demands of substations.
Tier 2 efficiency design combined with pure copper windings minimizes running losses. The fully sealed tank yields a design lifespan exceeding 25 years.
Oil filled substation transformer equipped with complete substation-level protection devices (Buchholz relay, pressure valve, fault alarms) to monitor status and cut off circuits rapidly during faults.
Its volume naturally fits standard substation layouts without requiring extra infrastructure. A 1.2x overload capacity effortlessly handles temporary peak loads.
The fully sealed structure drastically reduces maintenance frequency. Mature components ensure a low failure rate, meeting substations' low O&M cost requirements.
Optimized specifically for single-phase substation distribution networks. Convenient wiring precisely matches single-phase equipment demands.
Key Specifications (300kVA Substation Type)
| Parameter | Typical Value | Description |
| Rated Capacity | 300kVA | Maximum apparent power for long-term safety, meeting single-phase substation load needs. |
| Rated Voltage | 10kV / 0.23kV | Customizable 6kV, 11kV high voltage to adapt to different substation grid standards. |
| Vector Group | Ii0 | Standard single-phase connection; simple wiring perfectly adapted to substation systems. |
| Impedance | 4.5%~6.5% | Standard 5%~6% limits short-circuit currents, protecting downstream substation equipment. |
| No-Load Loss | ≤ 0.55kW | Complies with Tier 2 standards; low idle energy consumption saves operational costs. |
| Load Loss (75℃) | ≤ 3.0kW | Copper windings and a substation-grade cooling structure elevate energy conversion efficiency. |
| Winding Temp. Rise | ≤ 65K (AN, Class A) | Synergistic temperature control prevents insulation aging caused by excessive heat. |
| Noise Level | ≤ 52~57dB(A) | Low-noise core and shock-absorbing design lower noise by 5dB, protecting substation environments. |
| Cooling Method | ONAN + Substation-Grade | Highly efficient cooling system tailored for continuous substation operations. |
Detailed Description
The S13 type oil filled substation transformer is a single-phase, Tier 2 efficiency distribution transformer featuring a fully sealed oil-immersed insulation, a substation-grade highly efficient cooling system, and pure copper windings. It represents the mainstream model for small and medium-capacity single-phase substations in the domestic market. oil filled substation transformer is core advantage is the specialized substation-grade adaptation design, which provides comprehensive insulation protection and advanced thermal regulation to thrive in complex operating environments.
The fully sealed structure thoroughly prevents oil oxidation and moisture ingress. Combined with low-resistance copper windings and the high-performance cooling system, it achieves stable, low-loss operation—reducing energy losses by approximately 20% compared to traditional S11 substation models. Delivering exceptional overload capacity and reliable performance in environments from -25℃ to 40℃, oil filled substation transformer acts as a dependable substation-level power support for various single-phase transmission needs.
S11 Type Substation Transformer Parameters & Scenarios
| Parameter | Typical Value | Description |
| Energy Efficiency | GB 20052-2024 Tier 2 (NX2) | Adapts to basic energy-saving compliance requirements. |
| No-Load Loss | Approx. 0.7kW | Slightly higher loss than S13, satisfying basic substation distribution energy needs. |
| Load Loss (75℃) | Approx. 3.0kW | Consistent with the S13 model of the same capacity. |
| Partial Discharge | ≤ 10pC | Reliable insulation performance, ensuring basic substation operational safety. |
| Structure | Sealed Tank + Basic Cooling | Adequate for conventional substation scenarios ensuring basic operational demands. |
| Applicable Scenarios | Budget-limited, load ≤ 60% | Ideal for rural town substations, small community substations, and older substation upgrades. |
Standard S13 Series Technical Reference
| Capacity (kVA) | Impedance (%) | No-Load Loss (W) | Load Loss (W) | No-Load Current (%) | Oil Weight (kg) | Total Weight (kg) | Dimensions W×D×H (mm) | Gauge (mm) |
| 30 | 4.0 | 80 | 630 / 600 | 1.2 | 100 | 340 | 790×580×910 | 400 |
| 50 | 4.0 | 100 | 910 / 870 | 1.2 | 115 | 410 | 830×600×970 | 400 |
| 63 | 4.0 | 110 | 1090 / 1040 | 1.0 | 120 | 440 | 850×630×1000 | 400 |
| 80 | 4.0 | 130 | 1310 / 1250 | 1.0 | 135 | 470 | 900×650×1000 | 400 |
| 100 | 4.0 | 150 | 1560 / 1500 | 0.8 | 150 | 500 | 950×700×1000 | 400 |
| 125 | 4.0 | 170 | 1890 / 1800 | 0.8 | 175 | 600 | 1100×800×1000 | 550 |
| 160 | 4.0 | 200 | 2310 / 2200 | 0.7 | 200 | 700 | 1200×900×1050 | 550 |
| 200 | 4.0 | 240 | 2730 / 2600 | 0.7 | 215 | 750 | 1300×1000×1050 | 550 |
| 250 | 4.0 | 290 | 3200 / 3050 | 0.7 | 240 | 900 | 1400×1050×1100 | 550 |
| 315 | 4.0 | 340 | 3830 / 3650 | 0.6 | 275 | 1050 | 1500×1100×1150 | 660 |
| 400 | 4.0 | 410 | 4520 / 4300 | 0.6 | 310 | 1300 | 1550×1150×1150 | 660 |
| 500 | 4.0 | 480 | 5410 / 5150 | 0.6 | 360 | 1500 | 1650×1230×1200 | 660 |
| 630 | 4.5 | 570 | 6200 | 0.6 | 420 | 1700 | 1600×1250×1250 | 820 |
| 800 | 4.5 | 700 | 7500 | 0.5 | 520 | 2100 | 2100×1300×1650 | 820 |
| 1000 | 4.5 | 830 | 10300 | 0.5 | 620 | 2400 | 2150×1350×1700 | 820 |
| 1250 | 4.5 | 970 | 12000 | 0.5 | 680 | 2700 | 2200×1400×1900 | 820 |
| 1600 | 4.5 | 1170 | 14500 | 0.5 | 880 | 3400 | 2300×1450×1900 | 820 |
| 2000 | 5.0 | 1360 | 18300 | 0.4 | 1050 | 4400 | 2100×2200×2100 | 820 |
| 2500 | 5.0 | 1600 | 21200 | 0.4 | 1260 | 5000 | 2150×2300×2200 | 820 |
* The table above shows standard three-phase S13 series parameters, provided as a general manufacturing reference for the S13 technology platform.
FAQ
The oil acts as both cooling medium and insulator for an oil filled substation transformer. It absorbs heat from windings and core, blocks electrical discharge, and extends internal insulation service life in substation power systems.
With regular oil testing, leak inspection and load control, our oil filled substation transformer can run stably for 25–40 years. Standard maintenance avoids overheating and oil contamination to prevent premature equipment failure.
For an oil filled substation transformer, conduct annual oil dielectric testing, half-yearly visual leak checks, radiator cleaning, and dissolved gas analysis to detect hidden faults inside the substation transformer tank timely.
Our oil filled substation transformer fits outdoor power substations, industrial power grids and large distribution stations. It bears heavy overload capacity, features low unit cost and stable heat dissipation for high-voltage power transmission tasks.
Every oil filled substation transformer we produce strictly meets IEC 60296, IEEE C57 and GB power standards. We provide full test reports covering oil insulation, winding resistance and temperature rise for substation project acceptance.
Whatsapp: +86-13961294414
E-mail: junqiu.wang@czguanghui.cn
jocelyn.duan@czguanghui.cn
ADD: No. 1, Yulong Middle Road, Xuejia Town, Xinbei District, Changzhou City, China
Mobile: 0086-15380068868
