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Electrical & Grid

Transformers

Pad Mounted Distribution Transformer

Brand: WISHPOWER
Standard: GB 6451, IEC 60076, AS NZS 60076, CSAC88-16, ANSI/IEEE C57.12.00, GOST R 52719
The pad-mounted transformer is designed to be used in underground distribution systems. Their sealed high-voltage and low-voltage safety compartments ensure their safe operation and reduce the risk of accidents, making them ideally suited for use in residential applications, tourist sites, hotels, and other buildings. Pad-mounted transformers are placed inside a cabinet with doors and locks, usually located outdoors.

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DESCRIPTION

Specification

Primary Voltage (V)	33000
Model	TR D3SP-15-33000-220y/127	TR D3SP-30-33000-220y/127	TR D3SP-45-33000-220y/127	TR D3SP-75-33000-220y/127	TR D3SP-112.5-33000-220y/127	TR D3SP-150-33000-220y/127	TR D3SP-225-33000-220y/127	TR D3SP-225-33000-220y/127	TR D3SP-300-33000-220y/127
KVA Rating	15	30	45	75	112.5	150	225	300	500
No-Load Loss (W)	90	126	170	240	315	360	520	660	1050
Full Load Loss at 85°C (W)	236	433	603	917	1273	1600	2402	3063	4481
Total Losses at a load factor of 80% (W)	241	403	556	827	1130	1384	2057	2620	3918
80% load for distribution transformers (Efficiency in % at 85°C)	98.03	98.35	98.48	98.64	98.76	98.86	98.87	98.92	99.03
Impedance (85°C)	2.0~4.0	2.0~4.0	2.0~4.0	2.0~4.0	2.0~4.0	2.0~4.0	2.0~4.0	2.0~4.0	2.0~4.0
Oil Weight (L)	520	520	530	555	560	610	610	630	650
Total Weight (KG)	1500	1530	1560	1580	1750	1850	2180	2500	3100
Dimension (mm) A	2050	2050	2050	2050	2050	2050	2050	2050	2050
B	830	830	830	830	840	850	880	880	930
ØD	820	820	820	820	820	820	820	820	820
H	1900	1900	1900	1900	1900	1900	1900	1900	1900
Winding Material	AL-AL	AL-AL	AL-AL	AL-AL	AL-CU	AL-CU	AL-CU	AL-CU	AL-CU

The table above is just one of our product parameters. If you want more information, please get in touch with info@wishpower.net

What is the Pad Mounted Distribution Transformer?

Pad-mounted Distribution Transformer is a type of power transformer, that steps down the high-voltage electricity from the grid to lower voltage for use at homes, businesses, and industrial facilities. It is usually on a concrete pad in the ground and secured inside a tamper-resistant metal enclosure. In residential, commercial, and industrial parks, these transformers are often used in areas where overhead wires are either impractical or unsightly. The design feature of a secure design features lock mechanisms to avoid unauthorized access and public safety. It is above ground for easy maintenance and repair and does not require special equipment to get to the equipment. Additionally, the product is also built to handle outdoor weather, such as rain, heat, and cold, which brings its reliability in any condition.

Working Principle

Pad mounted transformer helps change high-voltage electricity from the utility power lines to a lower voltage suitable to be used in homes, businesses, and industrial applications. What it does is receive high voltage electricity on the input side, and pass the electricity down a primary winding in the transformer. The magnetic core also winds with this winding, which induces a magnetic field similar to that of the source with a secondary winding connected to the low-volume output side. This process of electromagnetic induction reduces the high voltage to a lower level. After the step down the voltage is now low enough that it can be successfully put out onto the transformer by the electricity and can be used on a safe, usable voltage level for everyday electrical systems. It is all housed in a tamper-proof metal enclosure to keep sensitive environmental and unauthorized access. The pad-mounted design accommodates the transformer at ground level giving easy access to maintenance and reliable power distribution in urban, suburban, and industrial areas.

What are its components?

Core:

The core is laminated steel, made for a magnetic path to provide the energy transfer between the windings. The electromagnetic induction process in the transformer is dependent on it.

Primary Windings:

These are strips of wire connected across the high-voltage bus of the transformer. High-voltage electricity is fed into the primary windings, and accordingly, a magnetic field is produced in the core by electromagnetic induction.

Secondary Windings:

On the low voltage side, these coils take in the induced current from the magnetic field in the core, lowering voltage down to a usable level for distribution.

Solid Insulation:

The three-phase pad-mounted transformer uses solid insulation that includes epoxy resin or cast resin for insulation of the windings as well as the core. This insulation offers electrical safety and avoids short circuits.

Enclosure or Housing:

The pad-mounted transformer, in a tamper-proof, weatherproof metal enclosure protects the components inside from the environment as well as unauthorized access. This housing is usually ventilated to facilitate cooling by circulatory air.

Cooling System:

Cooling of dry-type transformers is by air circulation. A few units naturally come as air-cooled (air and air), while others work with forced air cooling (fans), so they can shed the heat generated during working.

Bushings:

Bushings are insulated so that high-voltage and low-voltage wiring can be made to have a secure point of connection. These bushings ensure an electrical network connection that is both safe and effective.

Tap Changer:

It provides a little board that allows for small adjustments of the voltage on the transformer so it outputs at the same voltage each time. It compensates products arising from the incoming high voltage and thus ensures reliable power delivery.

Grounding System:

A grounding system is necessary to avoid electrical accidents and make it less likely to shock to transform.

Thermal Protection:

The dry-type pad-mounted transformer often includes thermal protection devices, such as temperature sensors or relays, to monitor heat levels. If the transformer overheats, these devices activate cooling measures or shut down the unit to prevent damage.

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