11 33KV 3 phase 300 kva dry type transformer

11 33KV 3 phase 300 kva dry type transformer

3 phase 300 kva dry type transformer are key electrical equipment in power distribution systems. As epoxy resin is a solid insulating material featuring flame retardancy and self-extinguishing properties, these transformers are both safe and clean.
Therefore, 3 phase 300 kva dry type transformer are widely adopted due to their outstanding advantages, including oil-free design, flame resistance, low operational losses and high disaster prevention capacity. Compared with oil-immersed transformers, dry-type transformers eliminate the risks of fire, explosion and environmental pollution associated with insulating oil. They also achieve lower levels of loss and noise, creating favorable conditions for the co-location of transformers and low-voltage switchgear in the same distribution room.
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11 33KV 3 phase 300 kva dry type transformer outage maintenance

1、Switching operations, safety protection, and safety warnings before inspection

a. Disconnect the low-voltage side circuit breaker of the transformer to be maintained, pull down the isolating switch, and hang the corresponding sign on the handle.

b. Disconnect the load switch on the high-voltage side of the transformer, confirm that it is in the disconnected position, then close the grounding knife, and complete the safety insurance of the switch and hang the relevant identification plate.

c. Check electricity, discharge, and hang grounding wires on the high and low voltage sides

2、Equipment inspection, dust removal and cleaning

Temperature controller：

a. If the temperature controller does not display, first check whether the fuse is blown. If it is blown, replace it with a fuse of the same specification.

b. Wipe off the dust on the temperature controller and re-tighten the connecting screws of the temperature controller’s control circuit.Fan: Tighten the screws for the fan power connection and the fixing bolts of the fan. Purge all parts of the fan with clean compressed air or oxygen.

Fan:
Tighten the screws for the fan’s power connection and the fixing bolts of the fan. Use clean compressed air or oxygen to purge all parts of the fan.
Coil:

Purge dust and foreign matter from the coil surface, inside the coil, and between the coil and the iron core using clean compressed air or oxygen (Note: Do not wipe the transformer body with damp objects to avoid reducing the insulation level). Tighten the jacking bolts on the coil spacers with a wrench.
Iron core:
Purge the surfaces and gaps of the iron core and clamps with clean compressed air or oxygen. If the surface coating of the iron core and clamps is damaged, repair it with paint of the same color (acrylic paint). Retighten the clamp bolts, pull plate bolts, and frame connection bolts.
Electrical connections:
Check if there are any signs of loosening in each connecting nut (whether the red dot marks are misaligned). For the fastening bolts at electrical connection points, it is recommended to use a torque wrench for re-tightening.

11 33KV 3 phase 300 kva dry type transformer outage maintenance

Rated capacity300 kva
Rated voltage6KV/10KV/33KV/35KV/40.5KV
modelSCB(10)-300/10/0.4KV or SCB(11)-300/10/0.4KV orSCB(12)-300/10/0.4KV orSCB(13)-300/10/0.4KV orSCB(14)-300/10/0.4KV or as per requirement
typeDry type (cast resin)
No. of phase3
Tapping range±2X2.5%
Vector GroupDyn11/Yyn0/as per requirement
Winding materialCopper/Aluminum
Core materialGO Steel
Cooling methodAN/AF
standardGB 1094/IEC 60076
Winding Temperature RiseF insulation class(100K)

H insulation class(125K)

No load lossas per requirement
Load lossas per requirement
Short circuit impedance6%
shellCold-Rolled Steel Sheet(IP20/IP23)/Stainless Steel

11 33KV 3 phase 300 kva dry type transformer outage maintenance

FAQ About QIANLAI’s 300 kVA Dry Type Transformer

What is the MOQ for your 300 kVA dry type transformer?

The minimum order quantity is 1 unit. We welcome both bulk orders and customized small-batch projects to meet your specific needs.

Do you provide OEM/ODM services?

Yes. As a factory-direct supplier, we offer full OEM/ODM services, including custom logos, specifications, and packaging. Our engineering team will work with you to design the perfect solution.

How long is the lead time?

Standard models are in stock with a lead time of 3-7 days. Customized 300 kVA dry type transformers take 15-25 days, depending on the complexity of the requirements.

What after-sales support do you offer?

We provide 2-year warranty, free technical consultation, and on-site installation guidance. Our global service team responds within 24 hours to resolve any issues.

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