225KVA Single-Phase Oil-Immersed Transformer

225KVA single-phase oil-immersed transformers roll out of the GUANGBIAN plant in China every week. They take 11KV to 33KV down to 0.4KV for solar sites, factory loads, and village grids.
● 15,000 sqm plant. 3,000+ transformers roll out a year.
● Custom ratios and tap changers: yes, send the data.
● Lead time runs 25-30 days. 15-20 when parts sit on the shelf.
● Spare parts in stock, not on backorder.

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Product Description

This 225KVA single-phase oil-immersed transformer comes from the GUANGBIAN factory in China. Feed it [11/19/33]KV, it hands back 0.4KV. Sealed tank design, cold-rolled silicon steel core, oxygen-free copper windings. Every unit tested before shipping.

Materials & Construction

● Core: cold-rolled grain-oriented silicon steel, full-miter joints, no punched holes—lower no-load loss

● Windings: oxygen-free copper, runs cooler

● Tank: corrugated or expansion type, fully sealed

Sealed means the oil never meets air. Clean oil ages slower. That's why these units last 25+ years with yearly checks. No conservator also cuts height—fits tight installations.

Technical Specifications

1. PRODUCT IDENTIFICATION

Product Name	Oil-Immersed Power Transformer
Type & Size	D-M-225/19
Phase	Single-phase (1 φ)
Rated Capacity	225	kVA
Frequency	50	Hz
Voltage Combination	19 / 0.4	kV
Connection Symbol	II0
Rated Current	11.84 / 562.5	A	HV / LV
Cooling Type	ONAN

2. RATING & TAPPING RANGE

Tap Position	HV Voltage (V)	HV Current (A)	LV Voltage (V)	LV Current (A)
1	19950
2	19475
3	19000	11.84	400	562.5
4	18525
5	18050

3. ROUTINE TEST RESULTS

3.1 Measurement of Voltage Ratio & Check of Connection Symbol

Tap Position	Voltage Ratio	Measured Error (%)	Connection Symbol
1	49.8750	0.03
2	48.6875	0.05
3	47.5000	0.04	II0
4	46.3125	0.04
5	45.1250	0.04

3.2 Measurement of Winding Resistance (ambient 10 °C)

Winding	Tap Position	Resistance (Ω)
HV (A–X)	1	9.981
HV (A–X)	2	9.729
HV (A–X)	3	9.472
HV (A–X)	4	9.236
HV (A–X)	5	8.967
LV (a–x)	—	0.003358

3.3 Measurement of Insulation Resistance

Measurement	Result
HV – (LV + Earth)	2000	MΩ
LV – (HV + Earth)	1500	MΩ

3.4 Insulating Oil

Item	Result
Oil type	25# mineral oil
Breakdown voltage	40	kV

3.5 Separate-Source Voltage Withstand Test (applied voltage)

Measurement	Power Frequency	Voltage	Duration
HV – (LV + Earth)	50 Hz	50 kV	60 s
LV – (HV + Earth)	50 Hz	5 kV	60 s

3.6 Induced Overvoltage Withstand Test

Applied at	Frequency	Test Level	Duration
LV side	100 Hz	200 % rated voltage	60 s

3.7 Measurement of No-Load Current & No-Load Loss

Item	Result
No-load current	0.62	%
No-load loss	310	W

3.8 Measurement of Short-Circuit Impedance & Load Loss (measured at 10 °C, referred to 75 °C)

Tap Position	Impedance Voltage at 75 °C	Load Loss at 75 °C
3	3.56 %	3120 W

3.9 Seal Test

Item	Result
Tank seal test	15 kPa applied for 24 hours — no leakage

Where It Fits

Solar + diesel microgrids, rural distribution, factory loads, street lighting. Handles load swings between sources without complaint. One 225KVA transformer powers roughly 100-180 households at 220V.

FAQ

Custom ratio?

Yes, send your nameplate data.

Lead time?

25-30 days standard, 15-20 if parts in stock.

Maintenance?

Once a year—oil check, tighten connections, clean bushings.

About GUANGBIAN

15,000 sqm factory, core processing to final test under one roof. ISO 9001:2015, IEC 60076 compliant. Every unit passes four checks before it ships. Export-grade wooden cases, 20/40ft containers, own crane crew.

Send specs and destination port. Quote within 24 hours.

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Contact Info

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Address

No. 8 Baoda Road, Liushitown, Yueqing City, Wenzhou City, Zhejiang Province，China
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Tel

+86-13186843786
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Email

wadechen@guangbianpower.com

For inquiries about Oil Immersed Transformer, Dry Type Transformer, Pole Mounted Transformer or price list, please leave your email to us and we will be in touch within 24 hours.