Industrial Heavy Duty Transformer

BIS marked Distribution Transformer Manufacturer

Name: BIS marked Distribution Transformer
Brand: Makpower

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ISO 9001:2015

Certified Specs

100% Tested

High Voltage Lab

BIS marked Distribution Transformer Manufacturer

Capacity: upto 10 MVA of voltage class upto 33KV

CAPACITY Up to 10 MVA

VOLTAGE Up to 33 kV

COOLING ONAN / ONAF

STANDARDS IS 1180 (Part 1) BIS

Makpower is a trusted BIS-marked Distribution Transformer manufacturer, offering energy-efficient and reliable solutions certified by CPRI and ERDA. Built as per IS:1180 standards, these transformers are designed for optimum power distribution in utilities and commercial sectors. With both copper and aluminium wound options, Makpower ensures strict compliance with mandated loss levels.

Range: Makpower manufactures BIS-certified Distribution Transformers with capacities up to 2500 KVA, in voltage class up to 33 kV. These transformers are designed to serve various rural, urban, and industrial power networks, offering durability, energy efficiency, and long-term service under all load conditions.

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Engineering Highlights & Features

High Permeability Core

Prime grade CRGO steel laminations precision cut to minimize core losses & magnetizing current.

Thermal Withstand

Engineered cooling ducts & high dielectric insulation system designed for severe duty thermal overloads.

Short Circuit Proof

Robust mechanical clamping and reinforced coil bracing to withstand electrodynamic short-circuit forces.

Custom Tap Switching

Available with automatic On-Load Tap Changer (OLTC) or manual Off-Circuit Tap Switch based on application.

Detailed Technical Specifications

Engineering Standards & Data

Technical Specifications

• Standards: Designed as per IS:1180 (Part-1)/2014

• Winding Options: Available with copper or aluminium windings

• Cooling Type: ONAN type for efficient heat dissipation

• Loss Levels: Meets Star 1, 2, and 3 efficiency levels per BIS

• Impedance: In accordance with IS tolerance ranges

• Vector Group: Dyn11 standard for distribution networks

• Tapping Range: ±5% off-circuit tap changer for voltage regulation

Types

Makpower’s BIS Distribution Transformers are available in multiple types to meet different utility specifications and grid standards:

• Pole-Mounted Transformers: Compact units used in rural or sub-urban areas, easy to install and maintain.

• Plinth-Mounted Transformers: Widely used in urban networks for reliable and tamper-proof operation.

• Pad-Mounted Units: Enclosed transformers for underground power distribution networks in urban areas.

• Customized Designs: Transformers with enhanced features like surge arresters, bird guards, or LV breakers for specific site needs.

Benefits of BIS Distribution Transformers

• Energy Efficient: Complies with BIS star-rating norms for reduced operational losses

• Durable Construction: Built with high-grade CRGO or amorphous core materials

• High Reliability: Proven insulation and oil sealing ensure long-lasting performance

• Compact Design: Engineered for space-saving installations in dense areas

• Eco-Friendly: Uses non-PCB insulating oil and supports environmental standards

Industry Applications

• Utilities: Power distribution to residential and commercial load centers

• Industrial Estates: Reliable energy supply for low-tension industrial applications

• Renewable Energy: Used in solar and wind power systems for grid connectivity

• Infrastructure Projects: Integral part of smart grids and urban electrification

• Government Schemes: Supplies transformers under DDUGJY, IPDS, and similar rural electrification programs

Quality and Compliance

• Testing & Certification: Approved by CPRI and ERDA for BIS compliance

• Quality Assurance: Each transformer undergoes full routine and type testing

• BIS Star Ratings: Available in Star 1, Star 2, and Star 3 loss level variants

• Core Materials: Uses high-permeability CRGO or amorphous metal cores for minimal losses

Support and Services

• Pre-Sales Consultation: Technical experts guide transformer selection per load requirements

• Custom Engineering: Solutions tailored to site-specific voltage and load variations

• After-Sales Support: AMC, oil testing, and maintenance services across India

• Spare Availability: Readily available accessories and replacement parts for long-term use

S.N.	Rating (KVA)	Voltage Ratio (kv)		%Z at 750C (Tol as per is 2026)	Level 1		Level 2		Level 3
S.N.	Rating (KVA)	Voltage Ratio (kv)		%Z at 750C (Tol as per is 2026)	Max. Total Loss at 50% Load	Max. Total Loss at 100% Load	Max. Total Loss at 50% Load	Max. Total Loss at 100% Load	Max. Total Loss at 50% Load	Max. Total Loss at 100% Load
1	16	11/0.433	3	4.50%	150	480	135	440	120	400
2	25	11/0.433	3	4.50%	210	695	190	635	175	595
3	63	11/0.433	3	4.50%	380	1250	340	1140	300	1050
4	100	11/0.433	3	4.50%	520	1800	475	1650	435	1500
5	160	11/0.433	3	4.50%	520	1800	475	1650	435	1500
6	200	11/0.433	3	4.50%	890	2700	780	2300	670	2100
7	250	11/0.433	3	4.50%	1050	3150	980	2930	920	2700
8	315	11/0.433	3	4.50%	1100	3275	1025	3100	955	2750
9	400	11/0.433	3	4.50%	1300	3875	1225	3450	1150	3330
10	500	11/0.433	3	4.50%	1600	4750	1510	4300	1430	4100
11	630	11/0.433	3	4.50%	2000	5855	1860	5300	1745	4850
12	1000	11/0.433	3	5.00%	3000	9000	2790	7700	2620	7000
13	1250	11/0.433	3	5.00%	3600	10750	3300	9200	3220	8400
14	1600	11/0.433	3	6.25%	4500	13500	4200	11800	3970	11300
15	2000	11/0.433	3	6.25%	5400	17000	5050	15000	4790	14100
16	2500	11/0.433	3	6.25%	6500	20000	6150	18500	5900	17500
17	315	33/0.433	3	4.50%	1183	3521	1102	3333	1027	2956
18	400	33/0.433	3	4.50%	1398	4166	1317	3709	1236	3580
19	500	33/0.433	3	4.50%	1720	5106	1623	4623	1537	4408
20	630	33/0.433	3	4.50%	2150	6294	2000	5698	1876	7525
21	1000	33/0.433	3	5.00%	3225	9675	2999	8278	2817	7525
22	1250	33/0.433	3	5.00%	3870	11556	3548	9890	3462	9030
23	1600	33/0.433	3	6.25%	4838	14513	4515	12685	4268	12148
24	2000	33/0.433	3	6.25%	5805	18275	5429	16125	5149	15158
25	2500	33/0.433	3	6.25%	6988	21500	6611	19888	6343	18813

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Additional Technical Information & FAQs

FAQs

What is a BIS distribution transformer?

A BIS distribution transformer is a low-loss transformer certified by the Bureau of Indian Standards under IS:1180 norms. It is used to step down voltage from 11/33 kV to consumer-usable levels like 440V or 230V.

What are the loss levels in BIS transformers?

BIS has defined maximum loss levels for transformers in Star 1, 2, and 3 categories. Makpower’s transformers are manufactured not to exceed these prescribed loss values, ensuring energy efficiency and cost savings.

What types of windings are used in distribution transformers?

Makpower offers both copper wound and aluminium wound transformers. Copper provides better conductivity, while aluminium is more cost-effective with lighter weight.