A 150 kva transformer introduction

The 150kva transformer is a transformer commonly used in power distribution systems. Can be used for lighting in homes, businesses, small factories, etc. Voltage levels are usually 6kV, 11kV, 15kV, 20kV, and 35kV.

Daelim is a professional manufacturer of medium and high voltage transformers, which can custom design and produce various types of 150kVA transformers. Whether the transformer you need is IEEE standard, IEC standard, CSA standard, ANSI standard, AS/AZ standard, etc., it can be fully satisfied.

Table of contents

1. What is a 150 kVA transformer？ 2. Design requirements for 150kva transformers 3. What are the types of 150 kVA transformers? 4. How much is a 150 kVA transformer？

 

What is a 150 kVA transformer？

 

A 150kva transformer means The transformer shall be designed, manufactured, and tested in accordance with IEC/IEEE/BSEN, etc std. And the rated power should be 150kva.

 

Learn more: Ultimate 500 kVA Transformer For Guide

 

Design requirements for 150kva transformers

1. The complete 150kva transformer tank shall be tested for leakage.

 

2. The 150kva transformer shall be able to operate at its continuous ratings without exceeding the temperature rises stated in IEC/IEEE/BSEN etc std.

 

3. Unless approved otherwise, the transformer shall have uniform insulation on all windings.

 

4. 150kva transformer Protection, monitoring, and indication equipment shall be visible from ground level.

 

5. 150kva transformer Loading must be possible even if the transformer was not in use for a longer period of time at the minimum ambient temperature. If this 150kva transformer requires special measures it has to be stated in the offer.

 

6. Meantime, the 150kva transformer shall be equipped with the Maschinenfabrik Reinhausen ECOTAP® VPD® on-load tap changer.

 

7. The task of voltage regulation is to limit the voltage tolerance of the output voltage.

 

8. The ECO TIP VPD on-load tap changer shall be in the following configuration:

- Drive: ECOTAP® VPD® MDC

- without a cabinet for the control unit (will be installed in a cabinet by the contractor)

- without CONTROL PRO

- Operating instructions - operator: German, quantity 2

- Connection-diagram / label language: German

- Additional connection-diagram language: without Drive

- Cable Length 10 m

 

This is just a part requirement of the 150KVA transformer.

 

Try for free: The Ultimate Guide to the 300kVA Transformer

 

What are the types of 150 kVA transformers?

Oil-immersed sealed transformers and dry-type transformers can be called 150KVA transformers as long as the capacity is 150KVA. Then we can introduce in detail what a 150KVA looks like from the different technical characteristics of the most commonly used oil-immersed transformers so that you can also better understand its type.

 

The transformers and their components are to be designed for normal operating conditions of outdoor switchgear and devices according to IEC/IEEE/BSEN.

 

The earthquake safety for a 150kva transformer in Switzerland has to be ensured acc. ESTI 248.

 

The following basic data has to be assumed

• Earthquake zone Z1

• Building ground class C

• Building class II

 

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For the fulfillment of the requirements concerning earthquake safety, the degree of the slenderness of the transformer and other necessary information has to be confirmed by the manufacturer.

 

Based on this information the responsible construction planner has to calculate the anchoring forces. A possible anchoring of the transformer has to be made according to the ETSI directives and these calculated forces. The transformer manufacturer has to define the necessary anchoring points on the transformer casing.

 

In addition to the harmonics defined below there will be other harmonics from power supplies and inverter-fed drives (PWM inverter), also single-phase loads (i.e. multiples of 3 as harmonics can occur)。

Read my article on 3 Phase Pad Mounted Transformer

 

On the HV side, the transformer is connected to a multilevel converter with IGBTs. This type of converter generates a voltage with steep voltage steps of approximately 2,3 kV. The control is hysteresis type, i.e. there is no fixed pulse pattern. As a result, the spectrum of the voltage has noise characteristics and behavior.

 

The 150kva transformer is mainly feeding power supplies and inverter-fed drives (PWM inverter), and occasionally thyristor-controlled inverter .standard porcelain bushings with Pfisterer 2DIREKT Transformer Clamp with cover (2DIREKT Four Wire Transformer Terminal Clamp (Pfisterer 331 747 00x), Conductor.

 

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Cross Sections 35 - 240 mm², with outdoor covers (Pfisterer 331 347 00x)。

 

Tanks, enclosures, equipment metalwork, components, accessories, fittings, and fastenings shall be protected against corrosion, including galvanic corrosion of dissimilar materials, for the life of the equipment at the specified location with a minimum of periodic restoration work.

In the event of sustaining damage or deterioration in service, the finish used shall be capable of being restored to its full protective standard on-site. Routine inspection of areas liable to corrosion shall be practical without the need to remove the equipment from service or dismantle it.

 

The factory acceptance tests (FAT) may be witnessed by the customer at an agreed date after completion in the factory.

Routine factory tests shall generally be performed in accordance with the respective equipment standards and the equipment Manufacturers’ standard testing procedures. 20 working days with needing notice shall be given for these tests.

Test certificates shall be provided for routine tests and FAT performed under these conditions.

 

 

If a type test protocol of a comparable transformer (size, voltage level) exists, it shall be attached to the offer. Otherwise, a typing test (tests as for a normal transformer without an on-load-tapchanger) shall be offered as an option.

In addition, the following test shall be done: With the regulation unit fully assembled on the150 kVA transformer, the following sequence of operations shall be performed without failure: With one winding short-circuited and, as far as practicable, rated current in the tapped winding, 10 cycles of tap-change operations across the complete range.

 

Try for free: Do You Know How To Do a Transformer Test?

 

In order to check the correct coordination of over-current protection and to have all information regarding the operation of the VRDT, the impedance voltage on all the taps shall be measured, related to HV rated voltage and rated power of the VRDT。

 

150kva transformer is connected on the either HV or LV side and the other side is open for testing.

 

The voltage shall be measured on the open side.

 

The control unit is in manual operation mode and then switches the complete regulation range. For each switching operation, the relative change in the measured voltage shall be equivalent to the regulation steps.

If the VRDT has an automatic mode then with rated voltage applied to the HV, manually set the regulator to one of the extreme positions, then switch to automatic mode and check that the system regulates the LV voltage to the rated value.

 

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The design of the equipment shall reduce the requirement for maintenance to a very low level. Maintenance procedures shall be confined to routine and preventive measures which shall be carried out at regular intervals.

 

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All works shall be executed according to a certified quality management system.

The transformer shall be low-maintenance, especially the maintenance requiring de-energization shall be minimized.

The manufacturer shall state the maintenance plan in the offer.

 

The availability of the transformer shall be at least 99.985%. If this is not possible due to the electronics, the manufacturer shall state the value which is reached.

 

Availability is the ability of a unit to meet the desired requirements under prevailing circumstances at a given point in time or within a given period, assuming that the required resources are provided.

Trip of the converter because of a technical fault of the transformer or the inability to fulfill operational requirements due to a transformer failure.

 

The failure frequency for transformers shall not exceed one transformer failure during the Transformer Service Life. Transformer failure is defined as an unplanned interruption causing loss of capacity or inability to operate the transformer.

 

Try for free: How much do you know about oil-immersed distribution transformers?

 

How much is a 150 kVA transformer？

First of all, the most important thing is what kind of material the silicon steel sheet and coil are used. The method, impedance, efficiency, withstand voltage level, etc. will all have a key impact on the price of the transformer. In addition, the capacity of the transformer, the strength of the insulation level, no-load voltage, and electromagnetic shielding will affect the price of the transformer.

 

This needs to be analyzed from many aspects, such as the following broad influencing factors:

 

1.150kva transformer electrical parameters: an important factor affecting the price; as we all know: the power of the transformer = voltage × current; the greater the power, the higher the price; the unit price of a multi-winding transformer is definitely higher than that of a single winding;

 

2.150kva transformer quantity: When customers customize transformers in large quantities, the price will be relatively flexible, which is lower than the retail price;

 

3. 150 kVA transformed labor: As prices continue to rise, the relative labor costs will also increase, thus affecting the price of transformers;

 

4.150 kVA transformer logistics: Since the toroidal transformer is a heavy object, the weight, and transportation distance of the transformer will affect the price;

 

5. 150 kVA transformer industry competition: As the industry competition is getting bigger and bigger, all the transformer manufacturers are showing their swords and making their own unique moves. By chance, Hengda learned about the world's advanced aluminum welding technology, introduced the strict aerospace aluminum welding technology into transformer production, solved the hidden quality problems of traditional aluminum connections, and saved customers 20% of the cost.

 

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The above are the main factors that affect the price of transformers for your reference. You must be clear about the factors that affect the price of common transformers so that you will not be deceived and buy genuine products! I hope you can buy transformers in the process smoothly.

 

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