Pad-mounted transformers are widely used in residential communities, hospitals, docks and other places that require centralized power supply.

What makes it so popular?

Safety, high cost performance, energy saving and high efficiency have become the name for it.

More and more buyers need to buy it?

But, What are Pad-mounted transformers?

What inside a pad-mounted transformer

What are the pad-mounted transformer health risks

How to choose a good Pad-mounted Manufacturer?

… …

We have many questions about the pad-mounted transformer, but we can not get them from the Sales Company’s product page.

But for purchasers or engineers, we need to know more about pad-mounted transformers in order to better buy and use it.

In this post, I will disassemble the pad-mounted transformer for you. I will also share some tips on how to choose a pad-mounted transformer.

Single Phase and Three Phase Pad-mounted Transformer From Daelim
Single Phase and Three Phase Pad-mounted Transformer From Daelim

Pad-mounted Transformer: The Ultimate FAQ Guide

What is Pad-mounted Transformer?

The pad-mounted transformer is an important power supply equipment in the cabled distribution network.

The pad-mounted transformer adopts a double-fuse full-range protection method. This greatly reduces the loss.

There are mainly two types: Single-phase Pad-mounted transformer and Three-phase Pad-mounted transformer.

The pad-mounted transformer has the performance advantages of a lightweight, low noise, small size, and low loss.

An excellent pad-mounted transformer is mainly composed of high-voltage control, protection, substation, and power distribution equipment.

The pad-mounted transformer adopts the principle of parallel operation of the high-voltage side bus.

Its low-voltage side bus is mainly responsible for circuit breaker transfer.

It has good safety performance.

Pad-mounted transformers are widely used in large-scale business centers, railway stations, mines, and other large-scale event venues.

What's inside the pad-mounted transformer?

Pressure Relief Valve of the Pad-mounted Transformer

  1. The automatic pressure relief valve (Fig 3) is standard on all Daelim transformers.
  2. It is designed to slowly release the pressure to prevent the transformer tank from rupturing.
  3. These valves have been adjusted to 5 ±2 PSI when they leave the factory.
  4. The normal operation of the transformer will make the resulting in pressure fluctuations in the gas-filled headspace of the tank.
automatic pressure relief valve for pad-mounted transformer
automatic pressure relief valve for pad-mounted transformer

Opening the valve (Fig3) will drain the oil in the tank.

It will release the pressure in the fuel tank.

Fill Valve/Valve Cock

Daelim’s pad-mounted transformer contains two types of valves.

One is filling the plug with the Schrader valve (Fig 4A).

The other is the filling valve with the Schrader valve (Fig. 4B).

It is used for the introduction of nitrogen and dielectric fluid.

A filling plug with Schrader valve
A filling plug with Schrader valve
a filling valve with Schrader valve
a filling valve with Schrader valve

Drain Valve and Fluid Sampler of the Pad-mounted Transformer

fluid sampler for pad-mounted transformer
fluid sampler for pad-mounted transformer
  1. The discharge valve and fluid sampler (Fig 5) is used to facilitate the sampling of dielectric fluids.
  2. It is mainly used for testing.
  3. A 1/2″ to 2″ plug can help this valve speed up the discharge of the dielectric fluid.
  4. The valve can be sampled without removing the end plug.

Liquid Level Gauge of the Pad-mounted Transformer

  1. The amount of dielectric in the pad-mounted transformer tank can be observed with a level gauge (Fig 6).
  2. It is magnetically coupled to the indicator needle in the gauge.
  3. The magnetic coupling maintains the liquid seal between the inside and the outside.
  4. It can minimize potential leakage.
level gauge for pad-mounted transformer
level gauge for pad-mounted transformer

Daelim uses a variety of different brands and models of level gauges according to the application.

Daelim can be equipped with standard instruments as required. If the environment is complex, more complex models can also be provided. It can facilitate external monitoring.

Under normal operation, the liquid level may change according to temperature and pressure.

Temperature gauge of the Pad-mounted Transformer

Daelim pad-mounted transformer provides a thermometer (Fig 7).

Its function is to observe the temperature of the top dielectric fluid in the fuel tank.

It includes two hands, one white and one red.

The white pointer indicates the current oil temperature of the pad-mounted transformer.

The red pointer indicates the maximum reset value of the dielectric fluid temperature.

The long thermocouple is its main component.

In order to facilitate the replacement of the gauge. The thermocouple and the dielectric fluid are isolated from each other.

Temperature gauge for pad-mounted transformer
Temperature gauge for pad-mounted transformer

There are one or two SPDT alarm points on the thermometer.

It has the function of remote monitoring.

These alarms for electric shock can be set according to factory requirements.

Unscrew the small hexagonal fixing screw in the center of the meter.

It can help you adjust the contact.

Set the contacts to the required temperature. You can complete the operation.

Pressure Vacuum Gauge of the Pad-mounted Tranformer

The pressure gauge (Fig 8) indicates whether the headspace pressure in the tank is positive, negative, or neutral.

The pressure change factors in the fuel tank:

  1. The load of the device;
  2. The temperature of the oil;
  3. The temperature of the external environment;
  4. The load of the device.

Pad-Mounted transformers usually have positive or negative voltage.

Continuous low temperature will cause continuous negative pressure. It is normal.

However, if the temperature rises, the meter reading is still zero.

This means that there is a leak.

The leakage of equipment needs to be checked.

pressure gauge for pad-mounted transformer
pressure gauge for pad-mounted transformer

Daelim can equip the pressure gauge with SPDT alarm contacts according to your requirements.

It can remote monitoring of positive and negative pressures.

The pressure/vacuum gauge can also be equipped with a decompression or regulator.

When used in combination with an external nitrogen supply, the tank can maintain a positive pressure (2.5 to 3.0 PSI).

The valve of the regulator can be used to collect gas samples.

Fault Pressure Relief Device (FPRD) for the Pad-mounted Transformer

Fault Pressure Relief Device (FPRD) for Pad-Mounted Transformer
Fault Pressure Relief Device (FPRD) for Pad-Mounted Transformer
  1. People often called an explosion-proof device (Fig 9).
  2. The function of this device is to quickly release the gas pressure due to internal failure.
  3. The APRD lid with a spring-loaded diaphragm installed will open at a predetermined pressure level of 10 PSI.
  4. And it will be closed again when the pressure is restored.
  5. FPRD has a yellow alarm button. It will stand out when the pressure is abnormal.
  6. FPRD is equipped with SPDT alarm for the convenience of remote monitoring.

Rapid Pressure Rise Relay (RPRR) for the Pad-mounted Transformer

  1. The RPRR (Fig 10) is a device that detects sudden pressure events based on the transformer pressure rise rate.
  2. RPRR will issue a trip signal when the pressure suddenly rises.
  3. It will greatly reduce the damage of the Pad mounted transformer.
Rapid Pressure Rise Relay (RPRR) with Seal-in relay for Pad-mounted transformer
Rapid Pressure Rise Relay (RPRR) with Seal-in relay for Pad-mounted transformer

Winding Temperature Indicator for the Pad-mounted Transformer

Winding Temperature Indicator for Pad-Mounted Transformer
Winding Temperature Indicator for Pad-Mounted Transformer
  1. Daelim uses a digital winding temperature monitor (Fig 11).
  2. It consists of thermocouples wound in each coil at strategic locations in the Pad-mounted transformer.
  3. It can accurately monitor the temperature inside the coil.
  4. The digital reading and control device is located in a separate NEMA4 enclosure.
  5. It is usually installed on the side of the tank.

Forced Air Cooling Fans for the Pad-mounted Transformer

  1. The forced air cooling fan (Fig 12) can be optionally used in a device equipped with a radiator.
  2. It increases the KVA capacity of the pad-mounted transformer by 25% without overheating or adverse effects.
  3. Daelim can increase or decrease the number of fans according to user needs.
  4. The fan can be controlled by a gauge oil thermometer with contacts or a winding temperature indicator.
Forced Air Cooling Fans for Pad-Mounted Transformer
Forced Air Cooling Fans for Pad-Mounted Transformer

CT for the Pad-mounted Transformer

Daelim can equip pad-mounted transformers with different types and levels of CT according to user requirements.

The following are three types of CT:

  1. CT on the casing (Fig 13A).
  2. CT inside the transformer (Fig 13B).
  3. CT on the meter socket (Fig 13C).

Switching and Protection Devices for the Pad-mounted Transformer

Tap Changers

An externally operated no-load tap changer (NLTC) (Fig 14 A and B) is suitable for all kinds of pad-mounted transformers.

The rated voltage of the tap under normal conditions is -5%~5%.

This means that the output voltage of the Pad-mounted transformer is adjusted in increments of 2.5%.

The tap switch is designed as an operable handle.

It is available in two styles.

Each of which requires a slightly different method to change tap settings.

no-load tap changer for pad-mounted transformer
Fig 14B

Load Break Oil-Immersed Rotary Switches (LBOR)

Four - Position LBOR Switch “Sectionalizing Switch”

  1. The four-position LBOR segment switch (Fig 16 A and B) is optionally provided in the loop feeder Pad-mounted transformer.
  2. It can select the feed source.
  3. It can turn on or off the feed through the loop.
  4. The spring-loaded activation mechanism ensures rapid load disconnection.
  5. Only hot rods can be used for switching.
T blade 4 - Position LBOR Switch
T blade 4 - Position LBOR Switch
V blade 4 - Position LBOR Switch
V blade 4 - Position LBOR Switch

Dual Voltage Switch

Dual Voltage Switch for Pad-mounted Transformer
Dual Voltage Switch for Pad-mounted Transformer

The Dual Voltage Switch (Fig. 17) can facilitate selecting one primary voltage from another.

Delta-Wye Switch

  1. Due to the special needs of customers, the Delta-Wye switch can be installed on the Pad-mounted transformer (Fig 18).
  2. It can help switch between Wye and Delta voltage.
Delta-Wye Switch for pad-mounted transformer
Delta-Wye Switch for pad-mounted transformer

Surge Arresters for the pad mounted transformer

  1. Lightning arresters (Fig 16) are optionally installed in the base pad-mounted transformer.
  2. If there is a voltage surge, Surge arresters can provide protection for the transformer.
  3. Under normal circumstances, the arrester terminals will withstand line-to-ground voltage.
  4. When a voltage surge occurs, the arrester will be grounded in order to keep the voltage normal.
  5. The arrester will automatically recover after the surge ends.

Grounding requirements for lightning protection in Pad-mounted Substations

Bay-O-Net Fuses for pad-mounted transformer
Bay-O-Net Fuses for pad-mounted transformer

Bay-O-Net Fuses

  1. Bay-o-net fuses (Fig 20 A) can be replaced without opening the transformer tank.
  2. It is used in series with the ELSP spare fuse to achieve over-current protection.

Bay-O-Net fuse replacement instruction (Fig. 20 B):

  1. Pull out the pressure release valve for 30 seconds until the hissing sound of the valve stops, thereby releasing the pressure in the Pad-mounted transformer tank;
  2. Repeat step 1 to ensure that any residual pressure is released;
  3. Connect the hot rod to the eye of the fuse holder and twist to unlock;
  4. Rotate the fuse holder 90° to damage the sealing gasket and Bay-O-Net housing;
  5. Pull the fuse holder out 8-10 inches quickly to interrupt the load;
  6. Wait a few seconds for the fluid to drain from the fuse holder and remove it from the housing;
  7. Use a ¾” wrench to remove the fuse box from the fuse box holder;
  8. Use ¾” and ½” wrenches to remove the end plug;
  9. Replace the fuse.
Bay-O-Net fuse replacement instruction
Bay-O-Net fuse replacement instruction

Dry-Well Canister Fuses

Dry-Well Canister Fuses for pad-mounted transformer
Dry-Well Canister Fuses for pad-mounted transformer
  1. The fiber-wound glass tube is the main component of the dry-well housing.
  2. Its surface is covered with resin.
  3. This is to prevent oil from penetrating the pipe wall.
  4. Because oil enters the fuse, the fuse will be abnormal.

What Connection Methods are Used for Pad-mounted Transformers?

Daelim's pad mounted transformer installed in Venezuela
Daelim's pad mounted transformer installed in Venezuela

External Connection

  1. Clean the bushing and terminals before making pad-mounted transformer connections.
  2. Remove dirt, grease, or foreign matter. Contamination can cause the bushing to fail.
  3. The cables connected to the transformer terminals should have sufficient flexibility .
  4. Make sure it can allow normal pad movement due to ground freezing/thawing.

Ground Connection

  1. Daelim will provide customers with two solutions based on the size of the transformer mounted on the pad. Grounding pad (Fig 1) or boss (Fig 2).
  2. One is on the primary side and the other is on the secondary side.
  3. Transformer oil tank needs to be connected to low resistance ground. If the connection is not strong enough, this will cause the oil tank to become live and cause casualties.
primary side
primary side
secondary side
secondary side

High Voltage Connection

The connections must be made in accordance with the diagrams and information provided on the nameplate.

There are two typical high voltage connections:

a.Live front transformer connections

External/internal clamping porcelain bushings are usually used for high-voltage connections to pad-mounted transformers.

Daelim was provided with eye bolts or spade terminals suitable for copper and aluminum conductors.

b.Dead front transformer connections

Cased wells or one-piece bushings are usually used for high-voltage connections to pad-mounted transformers

It is suitable for elbow connections.

Low Voltage Connection

Equipped with spade terminals with 2 to 20 holes.

It can take a low voltage connection to pad-mounted transformers.

Connection Mode of Working Winding of Three-phase Transformer

How to Residential a Pad-mounted Transformer?

Pre-service inspection

Before the work starts, a full inspection of the pad-mounted transformer is required.

Confirm that all its accessories are normal. There was no damage.
The following are the inspection steps:

  1. Confirm the liquid position of the oil tank.
  2. Perform transformer turns ratio and DC insulation tests.
  3. Ensure that the outer surface of the Pad-mounted transformer is complete.
  4. Check the condition of all seals and gaskets.

Location Consideration

pad-mounted transformer installation diagram
pad-mounted transformer installation diagram

Pad mounted transformer needs to be placed in an open place. This will facilitate a comprehensive inspection.

Outdoor Installations Pad-mounted Transformer

The correct placement of the pad-mounted transformer should be far away from the structure that restricts the airflow around the equipment.

Indoor Installations Pad-mounted Transformer

Special precautions should be taken.

The venue must be ventilated.

Confirm that the vent is open. This is to prevent accidental overheating of the transformer.

If good natural ventilation is not possible, a fan can be used to make the transformer out of the ventilated environment.

The pad-mounted transformer must be prevented from being on a level ground.

The ground must be concrete.

The location must prevent the pad-mounted transformer from tilting more than 2 degrees from the horizontal.

The pad-mounted transformer oil tank and the cabinet base provide provisions for installing splints to secure the transformer to the mat.

There must be no gap between the gasket and the cabinet.

Add permanent mortar to seal the gaps.

How to Store Pad-mounted Transformer?

Storage for 3 months or less

  1. The transformer has been dried before leaving the factory.
  2. There was no leakage of oil during shipment.
  3. The place is open and dry.
  4. There will be no significant temperature changes in the placement location.
  5. Place on the concrete floor or steel plate floor.

How to prevent transformer oil from deteriorating?

Daelim three phase pad mounted transformer warehouse
Daelim three phase pad mounted transformer warehouse

Storage for more than 3 months

Daelim Single Phase Pad Mounted Distribution Transformer warehouse
Daelim Single Phase Pad Mounted Distribution Transformer warehouse
  1. In order to maintain the nitrogen and oxygen content in the fuel tank, dry nitrogen in the fuel tank at 2 psi.
  2. Confirm that the condensing heater is in a state where it can work normally.
  3. The transformer must be placed in a dry and constant temperature place.

How to Ship the Pad-mounted Transformer?

Daelim's factory
Daelim's factory
  1. The Pad-mounted transformer is in a complete state when it leaves the factory.
  2. The Pad-mounted transformer will be completely placed on the pallet and fixed.
  3. The detachable radiator will be shipped separately and wrapped in a protective cover.
  4. The radiator will be packaged in a dry state.

How to Move the Pad-mounted Transformer?

Move the Pad-mounted Transformer
Move the Pad-mounted Transformer

Moving Pad-mounted transformers shipped on pallets

Single phase pad mounted transformer ready to move
Single phase pad mounted transformer ready to move
  1. The wooden pallet holding the Pad-mounted transformer is recommended to be moved with a forklift.
  2. When using a forklift, make sure that the fuel tank of the transformer is on the side close to the driving position. Place it overturned.
  3. If you don’t have a forklift, you can use a crane to move it.

Moving Pad-mounted transformers by hoist or crane

Lifting three-phase pad-mounted transformer
Lifting three-phase pad-mounted transformer
  1. Before starting the lifting work, check whether all the equipment used for lifting can work normally.
  2. There are lifting eyes on both sides of the fuel tank. If a wire rope is used, the lifting angle must not be greater than 60.
  3. The Pad-mounted transformer must be in an upright state when being lifted.
  4. If necessary, use cross bars to support the wire rope to avoid any deformation of the box structure or the lifting hook.

Skidding/Rolling Pad-mounted Transformers

  1. When the use of the crane is restricted, the pad-mounted transformer can be moved using a rolling device.
  2. During the movement, the transformer should be kept in a vertical state and moved horizontally.
  3. The rolling equipment must be able to provide a pulling force higher than the weight of the transformer.
  4. The multi-roller design can help the transformer move more smoothly.
Transformer conveyor belt
Transformer conveyor belt

Using Jacks to move Pad-mounted Transformers

Using Jacks to move Pad-mounted Transformers
Using Jacks to move Pad-mounted Transformers
  1. The jack must be placed under the fuel tank base.
  2. The lift provided by the jack must exceed the weight of the Pad-mounted transformer.
  3. More than two jacks must be used to work at the same time.

How to Check the Pad-mounted Transformer?

  1. Daelim Pad-mounted transformers are thoroughly tested and rigorously inspected before shipment from the factory to ensure the highest quality.
  2. Whether the exterior of the Pad-mounted tranformer is complete and free of scratches.
  3. Check whether all transformer accessories are complete and in normal condition.
  4. According to the material list provided by Daelim, confirm that all link accessories are in complete condition.
  5. Check whether the pointers of each meter on the high-voltage side are normal;  ,
  6. If the terms of the transaction are FOB, Daelim will deliver the transformer to the FOB delivery point as required.
  7. If there is a subsequent loss, you can file a claim with the carrier.

How to Maintain Pad Mounted Transformer?

Spare Parts

  1. Daelim can provide you with customized Pad-mounted transformers according to your specific needs.
  2. We only produce a limited number of Pad-mounted transformers. designed by anyone.
  3. It is best to deal with replacement parts according to the specific situation.
  4. If you need to add or replace parts for any Daelim device. Please contact Daelim. Daelim will provide all available nameplate data.

Routine Inspection

Routine inspections of the outside of the equipment should be carried out regularly.

  1. The inspection interval should consider the environmental conditions on-site.
  2. Salty, humid or other corrosive environments require shorter inspection intervals.
  3. Regularly check whether there are debris and obstacles between the radiators (equipped).
  4. If the device is equipped with forced air cooling, please use the switch in the control panel to manually circulate the fan to ensure normal operation.

Remove any dirt from the base and cabinet area to prevent premature rust and deterioration.

Check whether the surface paint of the pad-mounted transformer is complete.

If there is paint peeling on the surface, you can take a specific picture and tell Daelim.

Daelim staff will inform you of the type of paint used on specific parts.

This will help you improve the paint touch-up efficiency.

Regularly confirm whether each instrument is working properly.

  1. The level gauge is out of the normal fluctuation range. If there is a large drop in buoyancy, it means that the oil drum is leaking.
  2. Whether the fluctuation range of the thermometer is within the normal range.
  3. Whether the thermometer can fluctuate normally with changes in temperature and load conditions.
  4. If the pressure gauge stays at 0 for a long time, it means that the oil drum is leaking.

Dielectric Fluid Sampling

  1. Samples of the media fluid should be collected at least once a year. The collected samples must be analyzed by DGA (Dissolved Gas Analysis).
  2. The most important way to measure the state of the transformer during DGA testing.
  3. Conventional oil testing can usually indicate a harmful internal condition before it damages the device.

Maintenance procedures for pad mounted transformers

Pad-mounted Transformer Diagram

There are five main parameters for a Three-phase Pad-mounted transformer:

  1. Input current;
  2. Input voltage;
  3. Output current;
  4. Output voltage;
  5. Operating frequency range.

Three-phase Pad-mounted Transformer



Radial Feed Pad mounted Transformer Data
Radial Feed Pad mounted Transformer Data

Single-phase Pad-mounted Transformer

Single Phase pad mounted transformer
Single Phase pad mounted transformer
  1. Lock Mechanism;
  2. NEMA safety labels;
  3. Externally accessible expulsion fuse with drip cup;
  4. Parking stand for elbow connectors;
  5. High-voltage bushing wells;
  6. Tank ground provisions;
  7. Padlock provision;
  8. Flip-top hood opens 180º;
  9. Laser engraved nameplate;
  10. Pressure relief valve;
  11. Fill plug;
  12. Low-voltage threaded stud bushings;
  13. Removeble ground strap;
  14. Drain plug;
  15. Removable sill;


three-phase transformer winding
three-phase transformer winding
  1. Daelim uses a silicon steel sheet shearing machine to create a stepped, three-legged miter core structure.
  2. The miter core structure is completely cut from high-quality silicon steel (magnetic core steel).
  3. High-quality raw materials can greatly reduce the loss of the magnetic core.
  4. The mitered core structure eliminates the gap in the seam so that the transformer can obtain maximum efficiency.
  5. Use star connection to install three-phase pad-mounted transformers.

What are the types of transformer windings ? What are the types of concentric windings?

Pad-mounted Transformer Size

Single Phase Pad-mounted Transformer Size

Dimension (W*D*H): 610*740*840mm;
Oil Weight: 45 kg;
Total Weight: 294 kg;

Dimension (W*D*H): 610*740*840mm;
Oil Weight: 68 kg;
Total Weight: 362 kg;

Dimension (W*D*H): 610*760*840mm;
Oil Weight: 75 kg;
Total Weight: 476 kg;

Dimension (W*D*H): 610*810*840mm;
Oil Weight: 93 kg;
Total Weight: 553 kg;

Dimension (W*D*H): 610*860*840mm;
Oil Weight: 132 kg;
Total Weight: 672 kg;

Dimension (W*D*H): 740*940*910mm;
Oil Weight: 141 kg;
Total Weight: 742 kg;

Dimension (W*D*H): 760*1190*910mm;
Oil Weight: 207 kg;
Total Weight: 952 kg;

Three Phase Pad-mounted Transformer Size

Dimension (W*D*H): 1390*910*1430mm;
Oil Weight: 120 kg;
Total Weight: 645 kg;

Dimension (W*D*H): 1420*920*1430mm;
Oil Weight: 138 kg;
Total Weight: 729 kg;

Dimension (W*D*H): 1510*980*1530mm;
Oil Weight: 201 kg;
Total Weight: 989 kg;

Dimension (W*D*H): 1600*1000*1660mm;
Oil Weight: 230 kg;
Total Weight: 1195 kg;

Dimension (W*D*H): 1660*1080*1680mm;
Oil Weight: 260 kg;
Total Weight: 1415 kg;

Dimension (W*D*H): 1810*1160*1790mm;
Oil Weight: 325 kg;
Total Weight: 1905 kg;

Dimension (W*D*H): 2030*1300*2030mm;
Oil Weight: 535 kg;
Total Weight: 2755 kg;

Dimension (W*D*H): 1651*1549*1854mm;
Oil Weight: 650 kg;
Total Weight: 3235 kg;

Dimension (W*D*H): 2210*1470*2150mm;
Oil Weight: 748 kg;
Total Weight: 5835 kg;

Dimension (W*D*H): 2380*1600*2220mm;
Oil Weight: 950 kg;
Total Weight: 6430 kg;

Dimension (W*D*H): 2480*1650*2330mm;
Oil Weight: 1020 kg;
Total Weight: 8865 kg;

Pad-mounted Transformer Health Risks

The following are all health risks that may be involved in all pad-mounted transformers.

It includes the health risk caused by irregular operations during maintenance.

Health risk caused by wrong placement location selection.

Health risks of Switch

Health risks of Surge Arresters

Install Pad-mounted Transformer
Install Pad-mounted Transformer

Health risks of Switching and Protection Devices

Health Risks of Fusing

  1. In order to prevent the transformer from overheating, all transformer parts must be tightened.
  2. Risk of fire. Non-horizontal installation of the transformer can cause a fire and cause serious personal injury or death.
  3. The pad-mounted transformer must be kept on a flat concrete platform. Otherwise, it will overturn and cause casualties.

How to choose a good Pad-mounted Manufacturer?

With the expansion of market demand, more and more pad-mounted transformer manufacturers appear on the market.

But how to choose a suitable pad-mounted transformer manufacturer?

Below, we consider it in Four directions.

daelim engineer team
daelim engineer team

Understand your own needs

First confirm what type of pad-mounted transformer you need to buy?

Is it a three-phase pad-mounted transformer?

Or is it a single-phase pad-mounted transformer?

Confirm the Rated Power (KVA) of the pad-mounted transformer that you need to purchase.

Daelim has an excellent team of designers.

Whether it is a three-phase pad-mounted transformer or a single-phase pad-mounted transformer.

Daelim has more than 15 years of design and production experience.

Daelim can design and produce a pad-mounted transformer suitable for you according to your needs.

Confirm factory qualification

There are many traders pretending to be factories.

So how do you recognize whether the counterparty is a trader or a factory?

You can ask the other party to provide a business license.

And through the business license to check whether the other party has a factory.

Because the regulations of the power system of each country are different.

It is necessary to confirm whether the other party’s production has international certification.

Common certifications for pad-mounted transformers are: SGS, CNAS, CE, SA, CESI.

Daelim as a good pad-mounted manufacturer has all the above certifications.

The following are the certification and patent certificates obtained by Daelim.

Confirm factory experience

Whether a pad-mounted tranformer manufacturer has export experience is extremely important for your purchase.

It represents whether you can purchase a pad-mounted tranformer that meets the requirements of the local market.

It represents whether your purchase can proceed smoothly.

It represents whether your follow-up service can be complete and orderly.

Daelim has 15 years of experience in the production and export of pad-mounted tranformers.

Daelim’s products are exported to more than 30 countries and regions.

And can provide the completed installation and commissioning and other sales back-end services.

Below is a photo of Daelim and their business partners.


Confirm the strength of the factory

Due to the impact of the epidemic, you cannot go to the factory for on-site inspections.

But you can view it through video and other methods.

You need to know whether this pad-mounted transformer manufacturer has complete experimental equipment.

Does the pad-mounted transformer have a large workshop?

Does the pad-mounted transformer have a strong R&D team?

Daelim has complete production and testing equipment.

It includes a transformer Drying oven, a test console, Lighting impulse equipment, epoxy vacuum pouring machines, silicon steel sheet shearing automatic line…

Below are photos of these devices.

Custom Pad Mounted Transformer

When you need to find more than just existing transformers, Daelim’s Transformer Service Center can help you design and produce distribution transformers that meet your unique needs.

We have our own factory and a professional team of engineers, which can design and modify application requirements that meet all your conditions.

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