How to Purchase a 1500 kva Transformer in 2022?
There are also many types of 1500 kva transformer, and the specific uses of different types of transformers are also different.
Divided by cooling method, 1500 kva dry-type transformer VS 1500 kva oil-immersed transformer;
In terms of function, 1500 kva dry-type transformer VS 1500 kva pad transformer mounted;
Classified by voltage regulation, 1500 kva step-up transformer VS 1500 kva step-down transformer;
…
There are many other conditions that can be classified.
If you don’t pick the right transformer, it will overload your transformer, increase losses, and even damage your transformer in severe cases.
So you must choose a transformer that suits you, so as to help improve the stability of your power system.
Table of Contents
How Do You know If the Transformer You Need is 1500 kva?
Importantly, how do you choose a 1500 kva transformer that is right for you?
Read on to learn everything you need to know about 1500 kva transformers.
Then we will show you specific cases.
What is a 1500kva Transformer?
Often we will see 1500kva written in front of the requirement of a transformer.
You have to understand that transformers use KVA as a unit. Why?
The reason is that when the load is not determined, the size of the active power (symbol P, unit KW) and reactive power (symbol Q, unit KVAR) cannot be obtained.
Therefore, only the unit of KVA is used to express the apparent power, which is also called the rated capacity.
What is Rated Capacity (kVA)?
The rated capacity refers to the rated voltage. The capacity that can be delivered during continuous operation under the rated current.
Therefore, a 1500kva transformer refers to a transformer with a rated capacity of 1500kva.
How Many Types of Transformers Are There?
First of all, we make sure that a transformer with a rated capacity of 1500kva must not be a power transformer, but a distribution transformer.
The distribution transformers can be divided into two types according to the insulating medium: oil-immersed transformers and dry-type transformers.
Click here to tell you： the difference between oil-immersed transformers and dry-type transformers in detail.
Our common 35kv class three-phase oil-immersed transformer, 20kv class three-phase oil-immersed transformer and 10kv class three-phase oil-immersed transformer can all reach rated power of 1500kva.
At the same time, the 35kv three-phase epoxy resin dry-type transformer, the 20kv three-phase epoxy resin dry-type transformer, and the 10kv three-phase epoxy resin dry-type transformer can also achieve a rated capacity of 1500kva.
Click here to tell you in detail ：how to choose the right transformer?
After deciding whether you need to buy a dry-type transformer or an oil-immersed transformer, let’s find out:
What factors can affect the life of a transformer?
There are many factors that affect the life of a transformer.
The temperature and humidity of the environment, the frequency of use of the transformer, the load power of the transformer, the quality of the raw material of the transformer, and the aging degree of the insulating material will affect the life of the transformer.
Example: The effect of temperature and humidity on transformers.
Experiments show that the insulation temperature is high, the aging accumulation is high, and the mechanical loss cannot be recovered, which is very harmful to the life.
Click here to find out: What is The Alarm Temperature of The Dry-type Transformer?
The local temperature rises, the transformer temperature is high, and the life is short.
According to experience, the hottest temperature of the transformer is at the upper 2/3 of the winding stack and 1/3 of the high-voltage winding, and the heat is about 2/3 of the equal winding. For a running transformer, it will change the oil flow distribution inside the transformer and The temperature distribution leads to an increase in temperature, and the electrostatic discharge generated by the charging process of the oil flow in the transformer is most likely to occur in the dense area of space charge.
For example, near the inlet of the oil passage in the lower part of the winding and the outlet of the oil passage in the upper part of the winding, the power frequency field strength of these parts is very weak.
Therefore, the discharge depends entirely on the electrostatic potential generated by the accumulation of space charges, and the tolerance of the medium, and has the characteristics of discharge under a DC electric field. The discharge repetition rate is low, and the time from discharge initiation to accident is long.
Therefore, some signs of discharge can be found through monitoring, but sometimes discharge can also occur in oil passages or other parts with high working field strength.
Therefore, the cooling of the exhaust air of the transformer working on site must be done well, so that the main body is not overheated, and the ambient temperature should be monitored well.
Secondly, the drying time of vacuum drying furnace should be sufficient for components such as insulating cardboard.
Third, the transformer in operation should be closely monitored. If the indicators are abnormal, it should be dealt with. If the water in the oil is large, use a vacuum oil filter to filter the oil. If the medium loss is large, it needs to be adsorbed and filtered by white clay.
If the problem is particularly serious, it should be returned to the manufacturer for comprehensive treatment, including lifting the core, vacuum filtration of insulating oil, and drying of the body in a vacuum tank.
If the total power is 1500KVA, what is the rated capacity of the transformer should be used?
irst, according to the electrical load calculation formula:
Sn=Pjs/(β*cosΦ)
Pjs——active computing load (kW);
cosφ power factor;
β–transformer load utilization factor;
Sn=Pjs/(β*cosΦ)=1500/(0.85*0.9)=1960KVA
For 1960KVA, you can choose the common 2000kva transformer on the market.
Although there is also a transformer in the switching power supply, its oscillation frequency is very high, the volume and weight are relatively small, and the efficiency is very high. Other electronic components such as switching tubes and rectifiers consume little power.
When two 630kVA units are connected in parallel, the ideal maximum output is 2*630=1260kVA. The load rate of the transformer is also required to be 80%, which means that the transformer capacity can only be used at 1260*0.8=1008kVA.
The power factor is calculated as 0.9. At this time, the maximum output active power of the transformer is 1008*0.9=907.2kW<(1500+250=)1750kW.
Click here to learn more about: Selection and Capacity Calculation of Transformers Used in Substations
How big is the 1500 kVA transformer equipped with high voltage metering?
This capacity needs to be larger than the capacity of the 1500 kva transformer. Usually, it is designed to be used normally at 2000 kVA immediately, and it can also be used normally if the load is added later.
Next, I will tell you in detail：
A process of purchasing 357 1500 kva pad mounted transformers from Daelim.
This is a purchasing manager for a cryptocurrency farm from Canada.
The other party is very puzzled at first, is daelim a manufacturer?
Daelim’s sales engineer showed him the relevant certificates of IEC, ANSI/IEEE, CSA and AS obtained by Daelim’s factory. This is something a dealer wouldn’t have.
Special CSA certificate, which is a prerequisite for entering the Canadian market.
At the same time, Daelim also told the other party that the other party is always welcome to assign a third party to Dalin’s factory in Jiangsu for inspection.
Next, the other party asked about the delivery time?
DAELIM: For normal transformers, our standard production time is 4-6 weeks, for customized transformers, our fastest production time is 6-8 weeks.
The most important thing is that the other party asked：
Whether the price has an advantage compared with other transformer production plants?
DAELIM: Because our factory located in the transformer base in China, we have well raw material supply chain. So we can always provide the competitive price to our customers.
Then, the other party described their own transformer parameter requirements in detail.
Pole mounted up to 167kva and Pad mounted up to 1500kva.
Quantities: 357 sets.
This project has 357 transformers, a total of 20 different items. DAELIM need detailed design for each items. Daelim was asked to provide production drawings within three weeks.
Due to the project needs of end users, the production time of transformer is only 90 days. But DAELIM’s production line is full at that time because other customers order.
The single-phase transformer needs to meet the standards of CSA 2.1 and CSA 2.2, pad mounted transformer needs to meet the standards of CSA 227.4, and the design of transformer parts and marks of transformers need to customize production.
Learn more:What is the CSA standard?
Daelim provides a detailed solution:
1. Fast submit the drawing
In order not to affect the delivery time, DAELIM engineer team delivered the drawings in batches. 60% of the drawings were delivered within two weeks and production was arranged in time. The remaining drawings were successfully delivered in the remaining two weeks.
2. Make a good production plan
DAELIM’s management pay much attention to the needs of customers, and has communicated with the production team and our supplier team for many times. The workers worked overtime to ensure the delivery of the customer requests.
3. 100% meet the standard requirements
Our team of engineers studied the CSA Standard carefully. Because they are based on IEEE standard, DAELIM designed and produced them according to it. For the existing technical problems or difference, our team has carried out hundreds of e-mail and telephone communication with customers .
Ultimately, Daelim completed production within 90 days. And provide pictures to each other after the production is completed.
After the end of production, daelim conducts product tests on these 1500kva transformers.
When finish the production, DAELIM did above FAT tests for each transformer one by one, and submit the testing report in time.
1. Ratio, Polarity, and Phase Relation
2.Resistance
3.Applied Potential
4.Induced Potential
5. Loss Test
6. Leak Test
7. Operation tests of all devices
After completing the test, dalim provides a package and shipping solution.
For single phase transformer, we used the wooden frame structure for the capacity up to 50kva, so it will save space and sea shipping cost.
For 1500 kva pad mounted transformer, we used the wooden pallet packing design, the customers can easy to take out the pad mount transformer from container.
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