Transformer & Switchgear Manufacturer in China

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Our own factory in China manufactures oil-immersed and dry-type transformers, plus switchgear, for contractors and distributors across Central Asia and Africa. Standard ratings, straightforward pricing, no tenders.

20–2500 kVA at 10/11 kV 50–20000 kVA at 35 kV 300+ transformer units/month

Where It's Made

Finished oil-immersed transformers at our manufacturing partner's facility

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Our own manufacturing base in China

Our transformers are built at our own factory in China, Henan Wanjin Electrical Equipment Co., Ltd., in operation since 2006. The factory handles production, routine testing before shipment and warranty. DailyENS, founded in 2022 and grown out of the factory's export business, handles export quotations, contracts, documentation, shipment coordination and after-sales communication. DailyENS orders receive guaranteed production priority, with a current capacity of 300+ transformer units per month.
See inside our factory →
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Routine test report, every shipment

Every transformer ships with its factory routine test report as standard, covering the applicable routine tests for that unit — winding resistance, voltage ratio and vector group, short-circuit impedance and load loss, no-load loss and no-load current, insulation resistance, and dielectric (withstand voltage) tests.
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Video verification available

Can't visit in person? We can arrange a live video walkthrough of the factory, share production progress videos for your specific order, and provide video of the test/inspection process before shipment.
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Built to IEC/GB design standards

Distribution-class equipment manufactured to IEC/GB design practice. For projects requiring full tender-scale type-test certification, talk to us first.

Beyond Our Own Manufacturing Base

When your requirement falls outside our range

Our own manufacturing base comes first. When a project needs a different specification, voltage class or product category we don't directly produce, we draw on a wider network of manufacturing partners across China to provide a suitable solution. In these cases, DailyENS manages the order and stays involved in specification matching, quality verification and shipment coordination, while production is carried out independently by the partner factory. Every equipment issue is DailyENS's responsibility to resolve, whether it comes from our own manufacturing base or our wider network.

How It's Made

Transformer core lamination and copper winding in production

Silicon-steel core lamination and copper winding, produced at our own manufacturing base — the same process used for every transformer we ship, with our team directly involved in production planning and quality control at every stage.

Production Cycle

Approximate production time, by capacity

Current capacity: 300+ transformer units/month

Standard quantities, up to 630 kVA~15 days

Standard quantities, above 630 kVA~25 days

This is production/ex-factory time, not door-to-door delivery time. Ocean freight and customs clearance are separate and vary by destination — we'll confirm a full timeline with your quote.

Counted from drawing confirmation.

What We Supply

Oil-Immersed Transformer

10/11 kV: 20–2500 kVA · 35 kV: 50–20000 kVA

Sealed-tank distribution transformers for outdoor pole/pad-mount installation.

Dry-Type Transformer

10/11 kV: 30–2500 kVA · contact us for exact capacity range

Cast-resin transformers for indoor, fire-sensitive or maintenance-light sites.

Switchgear

RMU & LV panel · up to 35kV

Ring main units and low-voltage panels to pair with your transformer order.

Specifications

Typical values from our standard catalogue; final specifications are confirmed in the technical offer.

S11 — oil-immersed distribution transformer, 10/11 kV class

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Rated capacity (kVA)	No-load loss (W)	Load loss (W)	Short-circuit impedance (%)	No-load current (%)	Vector group
30	100	630	4	2.3	Dyn11 / Yyn0
50	130	910	4	2.0	Dyn11 / Yyn0
80	180	1310	4	1.9	Dyn11 / Yyn0
100	200	1580	4	1.8	Dyn11 / Yyn0
160	280	2310	4	1.6	Dyn11 / Yyn0
200	340	2730	4	1.5	Dyn11 / Yyn0
250	400	3200	4	1.4	Dyn11 / Yyn0
315	480	3830	4	1.4	Dyn11 / Yyn0
400	570	4520	4	1.3	Dyn11 / Yyn0
500	680	5410	4	1.2	Dyn11 / Yyn0
630	810	6200	4.5	1.1	Dyn11 / Yyn0
800	980	7500	4.5	1.0	Dyn11 / Yyn0
1000	1150	10300	4.5	1.0	Dyn11 / Yyn0
1250	1360	12000	4.5	0.9	Dyn11 / Yyn0
1600	1640	14500	4.5	0.8	Dyn11 / Yyn0

Rated capacity 30 – 1600 kVA. Dyn11 and Yyn0 are both available. Rated capacity 20–2500 kVA is standard. The table lists the ratings with catalogue data; other standard ratings are confirmed in the technical offer.

S13 — oil-immersed distribution transformer, 10/11 kV class

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Rated capacity (kVA)	No-load loss (W)	Load loss (W) — G1: Grade-1 · G2: Grade-2	Short-circuit impedance (%)	No-load current (%)	Vector group
30	80	G1 550/480 · G2 630/600	4	1.4	Yyn0 / Dyn11
50	100	G1 730/695 · G2 910/870	4	1.2	Yyn0 / Dyn11
63	110	G1 870/830 · G2 1090/1040	4	0.97	Yyn0 / Dyn11
80	130	G1 1050/1000 · G2 1310/1250	4	0.97	Yyn0 / Dyn11
100	150	G1 1265/1200 · G2 1580/1500	4	0.97	Yyn0 / Dyn11
125	170	G1 1510/1440 · G2 1890/1800	4	0.84	Yyn0 / Dyn11
160	200	G1 1850/1760 · G2 2310/2200	4	0.84	Yyn0 / Dyn11
200	240	G1 2185/2080 · G2 2730/2600	4	0.74	Yyn0 / Dyn11
250	290	G1 2560/2440 · G2 3200/3050	4	0.64	Yyn0 / Dyn11
315	340	G1 3065/2920 · G2 3830/3650	4	0.64	Yyn0 / Dyn11
400	410	G1 3615/3440 · G2 4520/4300	4	0.54	Yyn0 / Dyn11
500	480	G1 4330/4120 · G2 5410/5150	4	0.54	Yyn0 / Dyn11
630	570	G1 4960 · G2 6200	4.5	0.54	Yyn0 / Dyn11
800	700	G1 6000 · G2 7500	4.5	0.48	Yyn0 / Dyn11
1000	830	G1 8240 · G2 10300	4.5	0.42	Yyn0 / Dyn11
1250	970	G1 9600 · G2 12000	4.5	0.36	Yyn0 / Dyn11
1600	1170	G1 11600 · G2 14500	4.5	0.36	Yyn0 / Dyn11

Rated capacity 30 – 1600 kVA. No-load loss Grade-1 and Grade-2 are identical in the factory data; load loss is shown as G1 · G2 (Grade-1 / Grade-2). For ratings up to 500 kVA each pair is upper = Dyn11, lower = Yyn0. Rated capacity 20–2500 kVA is standard. The table lists the ratings with catalogue data; other standard ratings are confirmed in the technical offer.

SCB10 — dry-type (cast-resin) transformer, 10 kV class

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Rated capacity (kVA)	No-load loss (W)	Load loss (W)	Short-circuit impedance (%)	Vector group
160	540	2130	4	D,yn11 / Y,yn0
200	620	2530	4	D,yn11 / Y,yn0
250	720	2760	4	D,yn11 / Y,yn0
315	880	3470	4	D,yn11 / Y,yn0
400	980	3990	4	D,yn11 / Y,yn0
500	1160	4880	4	D,yn11 / Y,yn0
630 (Uk 4%)	1340	5880	4	D,yn11 / Y,yn0
630 (Uk 6%)	1300	5960	6	D,yn11 / Y,yn0
800	1520	6960	6	D,yn11 / Y,yn0
1000	1770	8130	6	D,yn11 / Y,yn0
1250	2090	9690	6	D,yn11 / Y,yn0
1600	2450	11730	6	D,yn11 / Y,yn0
2000	3050	14450	6	D,yn11 / Y,yn0
2500	3600	17170	6	D,yn11 / Y,yn0

Rated capacity 30–2500 kVA is standard. The table lists the ratings with catalogue data (160 kVA and above); other standard ratings are confirmed in the technical offer.

SCB11 — dry-type (cast-resin) transformer, 10 kV class

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Rated capacity (kVA)	No-load loss (W)	Load loss (W)	Short-circuit impedance (%)	Vector group
160	480	2130	4	D,yn11 / Y,yn0
200	550	2530	4	D,yn11 / Y,yn0
250	640	2760	4	D,yn11 / Y,yn0
315	790	3470	4	D,yn11 / Y,yn0
400	880	3990	4	D,yn11 / Y,yn0
500	1040	4880	4	D,yn11 / Y,yn0
630 (Uk 4%)	1200	5880	4	D,yn11 / Y,yn0
630 (Uk 6%)	1170	5960	6	D,yn11 / Y,yn0
800	1360	6960	6	D,yn11 / Y,yn0
1000	1590	8130	6	D,yn11 / Y,yn0
1250	1880	9690	6	D,yn11 / Y,yn0
1600	2200	11700	6	D,yn11 / Y,yn0
2000	2740	14400	6	D,yn11 / Y,yn0
2500	3240	17100	6	D,yn11 / Y,yn0

Rated capacity 30–2500 kVA is standard. The table lists the ratings with catalogue data (160 kVA and above); other standard ratings are confirmed in the technical offer.

SCB12 — dry-type (cast-resin) transformer, 10 kV class

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Rated capacity (kVA)	No-load loss (W)	Load loss (W)	Short-circuit impedance (%)	Vector group
160	430	2130	4	D,yn11 / Y,yn0
200	495	2530	4	D,yn11 / Y,yn0
250	575	2760	4	D,yn11 / Y,yn0
315	705	3470	4	D,yn11 / Y,yn0
400	785	3990	4	D,yn11 / Y,yn0
500	930	4880	4	D,yn11 / Y,yn0
630 (Uk 4%)	1070	5880	4	D,yn11 / Y,yn0
630 (Uk 6%)	1040	5960	6	D,yn11 / Y,yn0
800	1210	6960	6	D,yn11 / Y,yn0
1000	1410	8130	6	D,yn11 / Y,yn0
1250	1670	9690	6	D,yn11 / Y,yn0
1600	1960	11700	6	D,yn11 / Y,yn0
2000	2440	14400	6	D,yn11 / Y,yn0
2500	2880	17100	6	D,yn11 / Y,yn0

Rated capacity 30–2500 kVA is standard. The table lists the ratings with catalogue data (160 kVA and above); other standard ratings are confirmed in the technical offer.

SCB13 — dry-type (cast-resin) transformer, 10 kV class

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Rated capacity (kVA)	No-load loss (W)	Load loss (W)	Short-circuit impedance (%)	Vector group
160	385	1910	4	D,yn11 / Y,yn0
200	445	2270	4	D,yn11 / Y,yn0
250	515	2480	4	D,yn11 / Y,yn0
315	635	3120	4	D,yn11 / Y,yn0
400	705	3590	4	D,yn11 / Y,yn0
500	835	4390	4	D,yn11 / Y,yn0
630 (Uk 4%)	965	5290	4	D,yn11 / Y,yn0
630 (Uk 6%)	935	5360	6	D,yn11 / Y,yn0
800	1090	6260	6	D,yn11 / Y,yn0
1000	1270	7310	6	D,yn11 / Y,yn0
1250	1500	8720	6	D,yn11 / Y,yn0
1600	1760	10500	6	D,yn11 / Y,yn0
2000	2190	13000	6	D,yn11 / Y,yn0
2500	2590	15400	6	D,yn11 / Y,yn0

Rated capacity 30–2500 kVA is standard. The table lists the ratings with catalogue data (160 kVA and above); other standard ratings are confirmed in the technical offer.

SZ11 — 35 kV class on-load tap-changing oil-immersed transformer

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Rated capacity (kVA)	No-load loss (W)	Load loss (W)	Short-circuit impedance (%)	No-load current (%)
50	188	1210	6.5	1.8
100	232	2010	6.5	1.9
125	272	2380	6.5	1.7
160	298	2860	6.5	1.6
200	344	3330	6.5	1.5
250	398	3960	6.5	1.4
315	478	4780	6.5	1.3
400	564	5740	6.5	1.2
500	692	6880	6.5	1.1
630	810	8280	6.5	1.0
800	942	9640	6.5	0.9
1000	1150	11520	6.5	0.8
1250	1390	13960	6.5	0.7
1600	1670	16860	6.5	0.6
2000	1940	23000	6.5	0.8
2500	2300	27300	6.5	0.7
3150	2680	32900	7.0	0.7
4000	3240	38900	7.0	0.6
5000	3870	46400	7.0	0.6
6300	4560	56200	7.5	0.6
8000	4810	70700	7.5	0.5
10000	5860	83200	7.5	0.5
12500	6880	98400	8	0.5
16000	7020	131700	8	0.4
20000	8270	155700	8	0.4

Rated capacity 50 – 20000 kVA. Short-circuit impedance follows the factory data.

Other series in the factory programme: S18, S22, SCB14, SCB18.

Already Serving

Kenya · Tanzania · Nigeria · Cote D'Ivoire · Uganda · Ethiopia · Ghana · Zambia · Mozambique · Cameroon · Senegal · Zimbabwe · Egypt · Morocco · Algeria · Sudan · Kazakhstan · Uzbekistan · Kyrgyzstan · Tajikistan · Turkmenistan

By Country

Nigeria · Kenya · Kazakhstan · Uzbekistan

Where We're Probably Not the Right Fit

We'd rather tell you upfront than take an order we can't properly fulfill:

Your project is a government tender or requires formal bid documentation
Full, project-specific type-test documentation or witnessed certification is a mandatory bid requirement
You need a permanent local after-sales team on the ground
You require open-account or extended credit terms
Your project needs country-specific approvals we don't currently hold

Common Questions

Do you handle tender or public-procurement projects?

Not currently. Our pricing and production time are built around standard, off-tender orders. If your project requires type-test certification or formal bid documentation, we're likely not the right fit — happy to say so upfront.

What payment terms do you offer?

T/T deposit with balance before shipment, or L/C at sight. We don't currently offer open account or extended payment terms. In some markets, we may also be able to accept payment in RMB where practical and compliant with local banking arrangements — ask us about your country.

Can I get a rating that's not listed here?

Yes — most capacities and voltage combinations within our stated ranges can be produced within a similar production time. Send us your spec and we'll confirm.

Do you supply components, such as transformer cores or windings, rather than complete units?

In some cases, yes — through our manufacturing network. This isn't our primary product line, so availability and pricing depend on the specific component and volume. Email us your requirement and we'll confirm whether we can support it.

Can you also supply switchgear with the same order?

Yes — RMUs and LV panels can be quoted and shipped alongside your transformer order to consolidate freight.

What's the warranty period for transformers and switchgear?

1 year, starting 30 days after the shipment date (those 30 days cover transit). The specific warranty terms are set out in the contract. If our engineer confirms an issue is a manufacturing defect that can't be corrected on site, and it's within this warranty period, we replace the unit at no cost.

If remote support can't resolve an issue, what happens next?

We first troubleshoot remotely with your on-site team via video guidance. If the issue can't be resolved this way, DailyENS can arrange for an engineer to travel to your site. In this case, the customer covers the engineer's travel costs — flights, accommodation, local transport, meals and a field allowance. We'll confirm the details with you before arranging travel.

If a transformer needs to be replaced, is it free?

If our engineer confirms the issue is a manufacturing defect that can't be corrected on site, and the unit is still within warranty, we replace it at no cost. If the issue is due to factors outside the product itself — such as installation, operating conditions, or misuse — replacement would be a new paid order, which we'll produce and ship as quickly as possible.

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Oil-Immersed Transformer

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Standard High Altitude High Corrosion Multi-Tap

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Have detailed specifications, drawings, or other files to share? Email us directly at [email protected]

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Transformer & Switchgear Manufacturer in China

Our own manufacturing base in China

Routine test report, every shipment

Video verification available

Built to IEC/GB design standards

When your requirement falls outside our range

Approximate production time, by capacity

Oil-Immersed Transformer

Dry-Type Transformer

Switchgear

S11 — oil-immersed distribution transformer, 10/11 kV class

S13 — oil-immersed distribution transformer, 10/11 kV class

SCB10 — dry-type (cast-resin) transformer, 10 kV class

SCB11 — dry-type (cast-resin) transformer, 10 kV class

SCB12 — dry-type (cast-resin) transformer, 10 kV class

SCB13 — dry-type (cast-resin) transformer, 10 kV class

SZ11 — 35 kV class on-load tap-changing oil-immersed transformer