2022 Ultimate 100 kva Class Power Distribution Transformer Guide

2022 Ultimate 100 kva Class Power Distribution Transformer Guide

There are many specific products of Distribution transformers with a rated capacity of 100kva. Such as oil-immersed transformers below 20kv, 100 KVA 3 PHASE DRY TYPE TRANSFORMER, 100 kva pad mounted transformer and 100 kVA Utility Pole Mount Transformer.

Pad-mounted Transformer

We can provide you single phase and three phase pad mounted transformer

Dry-type Transformer

Type:Cast resin; Rated Capacity: Up to 25MVA; Rated Voltage: Up to 36KV;

Pole Transformer

TypeCSP type Frequency: 50/60Hz; Rated Power: 5~167kva

Dry-type Transformer

Frequency: 50/60Hz Rated voltage:10kv, 20kv,30kv Rated Power: 400~2500kva

This article will give you a detailed description of the 100 kVA Distribution Transformer: Basics, Load Capacity, 3-Phase, and Weight.

Daelim’s constant goal is to improve product quality without disregarding any link in the quality chain.

You can expect excellent product quality and sincere service from us as we adhere to the quality principle of doing things practically and acting in good faith.

Our company will continue to retain the philosophy of stable operation and innovation to meet market demand better.

Table of Contents

What are the main features of a 100 kva transformer?

Design, engineering, manufacture, assembly, and testing are all included in the specification for a 100 kVA transformer.
The material has to meet high-quality standards in engineering design and quality. It must also continue to operate in a commercial manner acceptable to the buyer, who can reject any work or material that he deems unsatisfactory.
All components necessary for its successful and trouble-free functioning will be included in the material provided. Whether or not these components are included in this specification and the retail order, they are considered within the bidder’s supply scope.
First, it should be easy to operate, check, and repair when designing the Distribution transformer. Every safety precaution and provision for equipment and personnel involved in its operation and maintenance must be incorporated into the design.
This includes all outdoor equipment, including bushing insulators and mountings, which must be constructed to prevent water from collecting.
Daelim Standards specifications denote the most recent modifications and adjustments adopted and published unless otherwise stated in this document.
The international and international standards to which these standards are commonly compared, and the buyer has the option to accept or reject any other standard.
In addition to the above criteria, materials according to additional internationally recognized standards that assure an even higher level of quality can be used without issue.
Those bidders who want to offer material following a different standard will be aware of the distinct differences in the relevant schedule. 
This includes four copies of these standards, each with an accurate English translation.
If there is a discrepancy between these standards and this specification, this specification shall take precedence.
The applicable CEA, REC, IS, and CBIP manuals will be used for anything not addressed by this specification.

Try for free Distribution Transformer guide Now!

What is the 100 kva transformer?

100 kva oil type transformer

Winding the core into a rectangular shape and bolting it to the frame to reduce vibration or noise is the preferred method of constructing the core.

The whole design of the core must ensure that the core loss persists even while the 100 kva transformers are in continuous operation.
The offer must specify the maximum flux density used in the design. 

It must withstand 12.5 percent over fluxing due to the combination of voltage and frequency without causing any harmful heating at full load, and it must not become saturated.

The bidder is responsible for supplying the essential design data to back up their bid.

Moreover, Amorphous cores should not have a flux density of more than 1.38 Tesla.

The 100 kva transformer’s secondary voltage estimates the load current at 433 volts, 50 centimeters-per-second (cps).

No more than 5% of the whole load current will be increased by a 12.5% increase in voltage of 433 volts.

A magnetic balance test will be performed by connecting the L V phase by phase to the rated phase voltage and measuring an, bn,cn voltages.

Additionally, the LV bushing and HV bushing stems must have adequate detachable terminal connectors to connect the jumper without upsetting the bushing stem.

The high voltage phase windings should be identified with capital letters 1U, 1V, and 1W.

In contrast, the low voltage phase windings should be marked with corresponding tiny characters 2u, 2v, 2w, both inside and outside the tank.

The letter 2n should be used to denote the neutral point terminal.

Hence, phase windings should be identified with capital letters IU, IV, IW, and small letters 2u,2v,2w for high voltage and low voltage, respectively, on both the inside and exterior of the tank. Using the letter 2n, you may identify the neutral point terminal.

Earthing strips long enough to connect neutral to the local grounding terminal are required.

There should be a clear indication of how terminals are marked externally and internally on the schematic plate.

As such, temperature sensing, latching and tripping, and current interruption are the three major components of an electro-mechanical circuit breaker.

Temperature sensors could be placed into the breaker.

The100 kva transformer’s load current flows through them, which may be accomplished using bimetallic strings.

All rating transformers must also have a magnetic tripping device to speed up the breaker’s opening speed during high fault situations.

Because these bimetallic strips will be within this oil layer, this circuit breaker must be installed inside the transformer.

Within the same assembly parts as those used in industrial air circuit breakers, the circuit breaker’s latching and tripping operations can be performed.

The circuit breaker can be manually closed and opened on the ground. 

Copper and copper tungsten current interrupting connections are required for the breakers’ current carrying sections.

Current-carrying components of the breaker must bear the total load current at a current density of not more than 2.5 A/sq.

The cross-section for the additional mechanical strength of the area should be.

Under high fault current levels, the magnetic element will speed up the circuit breaker’s opening.

Magnetic trip elements will not affect the circuit breaker’s ability to respond to heat activity.

The breaker must meet a specified specification, which must be noted on the label.

An additional signal light is activated when the100 kva transformer load reaches a predetermined threshold, signaling that it is overloaded and that the 100 kVA Distribution Transformer must be changed out without disrupting service.

Only if the manufacturer and the buyer have agreed otherwise at the time of purchase will all tests and inspections be carried out at the manufacturer’s premises, and only if the manufacturer and the buyer have agreed otherwise.

The manufacturer’s responsibility is to ensure that the inspector representing the buyer has access to all appropriate facilities free of charge.

The manufacturer and his subcontractors must maintain craft quality to ensure components’ mechanical/electrical performance, compliance with drawings, and identification/acceptability of all materials/parts/equipment following the latest quality requirements of ISO 9000.

100 kVA Pole Mount Transformer

Daelim also provides:

  • A Quality Assurance Plan that details the steps in the manufacturing process.
  • The quality checks are conducted at each stage.
  • Any potential hold ups for the customer.

Before manufacturing can begin, the document must provide information on the testing and inspection procedures.

The buyer’s or his representative’s consent is required.

As long as the purchaser or his representatives has a right to study the inspection reports and quality checks of the manufacturer’s in-house inspection department that don’t have you hold points, they can make comments for further testing, rectification, or rejection of the product.

Then you should receive a list of the manufacturer’s test equipment and the most recent calibration certificates.

Finally, the buyer can have the inspection performed by a third party.

In a dispute over the quality of the supply, the purchaser has the right to have the test carried out by an independent agency at his own expense.

To ensure the quality of the goods, the buyer has the right to test 100 percent of the supply they choose, whether from the store or the field.

You have the power to refuse an entire shipment or penalize the manufacturer if there is any deviation, which could lead to blocklisting.

How much load can a 100 kVA transformer hold?

100 kva transformer

Transforms with kVA ratings can have their maximum full load current carrying capability calculated using this full load current calculator on the LT (415 V side) and HT (11 KV side) sides.

Thus, this type of 100 kVA Distribution Transformer is known as a distribution transformer because it delivers power to users’ homes and small businesses.

The transformer’s capacity is expressed in kVA. From 10 kVA to 3 kVA, the distribution transformer’s rating is available.

The primary function of a distribution transformer is to provide power to the distribution network’s final users.

The distribution transformer’s low- and high-voltage sides have a distinct current-carrying capacity.

When making a 100 kva distribution transformer’s primary and secondary windings, they are always formed in delta and star.

When it comes to secondary side neutrality, this is the primary factor.

Single-phase power on the consumer side requires a phase to neutral voltage of 230 volts, as we’ve already established.

The secondary side must always be low voltage and star type to maintain neutrality.

Since the beginning of time, the neutral wire has been grounded to keep the voltage at zero.

We need to know the type of distribution transformer to acquire the entire load current capacity.

The 10 kVA, 25 kVA, 63 kVA, and 100 kVA are all examples of low-power 100 kva distribution transformers. On the other hand, 250 kVA medium power distribution transformer More than 600 megawatts and one megavolt-ampere

There are transformers with 2.5 and 5 MVA of power rating.

However, only countries with LT voltages of 230 or 440 volts and ht voltages of 11 kilovolts can use this formula or calculator.

This formula can be used to determine the transformer’s maximum load capacity.

The distribution transformer must be balanced as part of the network’s power department’s load balancing duties. 

As a result of this knowledge, the transformer’s load balance can be adjusted to keep the load from exceeding the transformer’s capacity.

We can only prevent the load transformer from catching fire due to overloading if we know its maximum load.

What is the 3 phase 100 kva transformer?

100 kVA Distribution Transformer

Step-down transformer from 11 kV to 38 kV, the primary voltage is 11 kV, and the secondary is 38 kV in this 100 kVA 11 kV transformer. On the primary side, the transformer has a no-load tap changer with a 2*2.5 percent no load factor. With sophisticated technology and high-quality materials and components, our 100 KVA Distribution Transformer provides reliable quality and long service life.
It has been years since Daelim has maintained a defect rate record of zero for the 3 phase 100 kva transformers it has supplied. All essential international standards are adhered to in the design of the oil-immersed 3 phase 100 kva transformer.

Main Component of 3 phase 100 kva Transformer

100 kVA Utility Pole Mount Transformer


The 3 phase 100 kva transformer’s magnetic circuit comprises the transformer’s iron core, which is one of its most fundamental components. The transformer’s primary and secondary windings are located on the core’s iron. The iron core is commonly composed of a 0.35mm silicon steel sheet with an insulating surface to increase the magnetic permeability of the magnetic circuit and reduce eddy current loss. Besides the iron core column and the iron yoke, there are two parts to the iron core: To create a magnetic circuit, the iron core is connected to the windings via an iron yoke.


The3 phase 100 kva transformer winding is another essential component. Copper or aluminum wire wrapped in insulating paper constitutes the circuit of a transformer. In the high-voltage network, there is a high-voltage winding; in the low-voltage network, there is a low-voltage winding, and so on.

Transformer lead

A 3 phase 100 kva transformer lead must meet electrical performance, mechanical strength, and temperature increase standards.
This includes copper wire wrapped in paper and other types of metal and other types of metal such as raw bus bars and cable.
There are many lead connection methods that we use in our manufacturing process.

Oil Tank

The primary duties of 3 phase 100 kva transformer oil tanks are protecting the oil tank and storing the oil, providing an installation framework for external components, and dissipating heat.
Moreover, 3 Phase Transformer 100 kVA Oil Immersed Earthing Transformer will be given to our respected customers and the most joyfully considerate service providers. Our company offers you superior service with higher quality and greater efficiency. High tech, high standards, and high speed are among our company’s core values, which we have held since our existence.

How much does a 100 kVA transformer weight?

100 kVA pad mounted Transformer

The transformer’s core grows in size as the frequency drops. We must keep the frequency and cross-sectional area constant to maintain a steady flow. As a result, decreasing frequency necessitates increasing area to keep the flux constant. 
Then, we require less space if the frequency is high. Maintaining a steady flux rate is necessary if you want a stable cycle repetition frequency. As a result, a 25 Hz transformer will be larger than a 100 Hz transformer in dimensions.
Therefore, they will be heavier and more significant than the 100kVA, 100 Hz transformers, smaller and lighter. Other things equal, a faster-rotating machine will be smaller and lighter in weight than a slower-rotating one. The frequency utilized in aircraft is 400 Hz to reduce the weight of the electrical equipment.
The frequency at which we operate the transformer and the amount of power we intend to transfer through it influence the transformer’s size.
The relationship between frequency and power is a one-to-one one. Low-frequency transformers are used to move power measured in kilowatts and megawatts (50Hz,60Hz).
We employ high-frequency transformers with frequencies in the kHz or MHz range for low-power applications. 

Download Resource

About Daelim

Recent Posts

padmounted transformer

Padmounted Transformer in Construction Work The pad mounted transformer is widely used in electrical engineering

About Bin Dong

Hello, I am Bin, General manager of Daelim which is a leading transformer manufacturer. If you have problems when you are looking for the equipment, what you need to do is tell us.