How to Purchase a 1000 kva Transformer in 2022?

How to Purchase a 1000 kva Transformer in 2022

1000kva transformers are very common transformers on the market.

People usually purchase 1000 kva transformers for shopping malls, residential areas, small factories and other population or industrial gathering areas.

But since 1000 kva transformers have multiple styles, such as dry-type transformers, oil-immersed transformers and so on.

The single oil-immersed transformer also contains pad mounted transformer, oil-immersed all-copper transformer, etc.

It is worth mentioning that all 1000 kva transformers are three-phase transformers.

Below, I will tell you the relevant information and performance of the 1000 kva transformer in detail.

At the same time, I will also introduce three 1000 kva transformers for you in detail.

Table of Contents

What is a 1000 kva Oil Immersed Distribution Transformer?

1000 kva Oil Immersed Distribution Transformer

1000 kva oil-immersed distribution transformer is a new type of high energy-saving product.

Daelim’s oil-immersed distribution transformers comply with ANSIC57.12.00, IEC60076, GB1097 (power transformers) and GB/T6451 standards.

The core of 1000 kva oil-immersed distribution transformer adopts high magnetic permeability and low loss cold-rolled oriented silicon steel strip, and adopts a common lamination structure, which minimizes the distortion of magnetic flux density, thereby greatly reducing no-load loss and no-load current. .

The 1000 kva oil-immersed distribution transformer has a compact structure, reduces the radial force during short circuit, and has strong ability to resist sudden short circuit.

The 1000 kva oil-immersed distribution transformer has small no-load loss, small no-load excitation current and low noise.

Compared with the S9 product of the same capacity, the no-load loss is reduced by 30%, the no-load current is reduced by 50-70%, and the noise is reduced by 5-10DB. .

1000 kva Oil Immersed Distribution Transformers

Daelim's 1000 kva Oil Immersed Distribution Transformer Features

1. The 1000 kva oil-immersed distribution transformer is of a fully sealed structure, extending service life, free of hanging cores and maintenance-free;

2. The combined group of 1000 kva oil-immersed distribution transformers adopts Dyn11 to reduce the impact of harmonics on the power grid and improve the quality of power supply;

3. The upper and lower pressure windings are made of oxygen-free copper. The low-voltage windings of 500KVA and below adopt a double-layer cylindrical structure, and the high-voltage windings adopt a multi-layer cylindrical structure.

4. The 1000 kva oil-immersed distribution transformer iron core is made of imported high-quality cold-rolled silicon steel sheets, which greatly reduces no-load loss and no-load current, and stops tying the dead center to ensure the tightness of the dead center and reduce noise;

5.The 1000 kva oil-immersed distribution transformer is of a fully sealed structure, extending service life, free of hanging cores and maintenance-free;

part of 1000 kva Oil Immersed Distribution Transformer

The 1000 kva Oil-immersed Distribution Transformer is a Step-Up Transformer.

1000 kva Oil-immersed Distribution Transformer Specification

GradeHigh voltage kvLow voltage kvConnection SymbolShort Ciruit ImpendenceLoss(W)No-load loss Current
No-load loss (W)On-load loss (W)
35 kV356.3Yd11 Ynd116.51160115001
20 kV200.6Dyn11 Yyn051140102500.6
10 kV10.50.4Dyn11 Yyn04.51150103000.7

What is a 1000 kva Dry-type Transformer?

1000 kva dry-type transformers currently on the market are mainly epoxy resin cast three-phase dry-type transformers.

Daelim’s 1000kva transformers conform to UEC726, GB6450, GB/T10228-1997 standards.

This transformer has the characteristics of safety, flame retardant and fireproof, and no pollution.

It can be installed directly in the load center.

Maintenance-free and easy to install.

The 1000 kva dry-type transformer has good moisture-proof performance, and can be put into operation without pre-drying after outage.

The 1000 kva dry-type transformer has low loss, low partial discharge, low noise, and can operate at 120% rated load under forced air cooling.

The 1000 kva dry-type transformer is equipped with a complete temperature protection control system, which provides a reliable guarantee for the safe operation of the transformer. The reliability index of this product has reached the international advanced level.

1000 kva Dry Type Transformer

Get a comparison of the difference between Dry-type Transformer and Oil-Immersed Transformer.

Daelim's 1000 kva Dry Type Transformer Features

1. The coil of the 1000 kva dry-type transformer is wound with copper wire or foil, reinforced with glass fiber, and the epoxy resin is vacuum-dried, degassed and dehumidified without filler and cast as a whole, with high mechanical strength, short-circuit resistance and strong impact resistance.

2. The head and end of the high-voltage winding and the intermediate tap of the 1000 kva dry-type transformer are embedded with copper inserts.

3. The iron core of the 1000 kva dry-type transformer is made of high-quality grain-oriented cold-rolled silicon steel sheets, with 45-degree full-inclined multi-step joints. The surface is covered with resin insulating coating, which is resistant to moisture, rust and noise.

4. The iron core, clamps and coils of 1000 kva dry-type transformers are clamped by elastic parts, so that the coils are in a stable compression state to reduce noise.

5. The transformer is designed according to self-cooling. Longitudinal ventilation passages are reserved inside the wall of the high (low) voltage coil cast as a whole. It can be equipped with a forced air cooling device (cooling fan). After the forced air cooling device is adopted, the output capacity can be increased by 20 %.

1000 kva Dry-type Transformer Specification

GradeHigh voltage kvLow voltage kvConnection SymbolShort Ciruit ImpendenceLoss(W)No-load loss Current
No-load loss (W)On-load loss (W)
35 kV38.50.4Dyn11 Yyn062700110001
20 kV2282300103001
10 kV116176081200.8
part of 1000 kva Dry-type Transformer

What is a 1000 kva Pad Mounted Transformer?

1000 kva pad mounted transformer is also known as pre-installed substation.

It is especially suitable for Bitcoin mining farms.

The 1000 kva padmount transformer is a low-voltage power supply line that converts a high-voltage 10 kV voltage step-down transformer into a low-voltage 0.4 kV three-phase four-wire power supply line.

The interior of the 1000 kva padmount transformer houses high voltage switchgear, distribution transformers and low voltage distribution units, including automatic power factor compensation.

It is a factory prefabricated indoor and outdoor compact power distribution equipment arranged according to a certain wiring scheme. , Fireproof, anti-theft, heat insulation, fully enclosed, movable steel structure box, especially suitable for urban network construction and reconstruction, is a brand-new substation emerging after civil substation.

PadMounted Transformer

Features of Daelim's 1000 kva PadMounted Transformer

1. The pad mounted transformer uses high-quality silicon steel sheets to make a brand new iron core;

2. The pad mounted transformer has long service life, low loss and low noise;

3. The pad mounted transformer is suitable for terminal type applications with or without taps;

4. The pad mounted transformer has the characteristics of high voltage and no floating neutral point;

5. Daelim’s 1000 kva pad mounted transformers comply with CSA, ANSIC.57, DOE and IEEE standards;

1000 kva Pad Mounted Specification

High voltage kvLow voltage (kv)Loss (W)Dimension (mm)Weight (Kg)
No-load loss On-load loss WDHOil WeightTotal Weight
12470/7200600Y/3471150103001651154918546503235

What is the active power of a 1000KVA transformer?

1000 kVA refers to the apparent power of the transformer. Under the rated load of the transformer, if the power factor of the transformer is considered as 0.8, the active power of the transformer is P=1000×0.8=800 kilowatts.

If a load of 1000 kilowatts is carried, the transformer will be overloaded, the temperature of the transformer will rise, the insulation aging will be accelerated, and the service life of the transformer will be reduced.

Under special circumstances, the short-term overload operation of the transformer should not exceed 1/3 of the rated load in winter and 15% in summer.

The limit of the overload operation time depends on the ambient temperature of the transformer and the multiple of the overload.

1000KVA transformers

What is the maximum current of a 1000kva transformer?

Calculated according to the rated current of the transformer

The primary side is approximately 0.058*KVA (transformer capacity, specification 10kV/0.4kV)

The secondary side is approximately 1.44*KVA (transformer capacity, specification 10kV/0.4kV)

1000*1.44=1440A=1000/0.4/√3=1445A

Depends on your S-type transformer, such as S7, 8, 9 transformers can exceed 20%.

Now the transformers from the power supply bureau are S11 and above, which are energy-saving transformers and cannot be overloaded and can only reach 90%.

1000 normal maximum current 1000/1.732/0.38=1520A

Three-phase transformer rated power: S=1.732UI

Knowing S and U, the rated current I can be obtained, which is the maximum current during normal operation.

If it is single phase then: S=UI

If it is a 10KV/0.4KV three-phase transformer, then:

The rated current of the high-voltage side is I1=1000K/1.732/10K=57.74A

The rated current of the low-voltage side is I2=1000K/1.732/0.4K=1443.4A

In addition, the transformer allows short-term overload operation (such as one or two hours), so the actual current of the transformer during operation may exceed over its rated current I.

1000 kva transformer full load current

How to calculate the rated current of 1000kva transformer?

High and low voltage side current calculation, transformer capacity/voltage level/1.732*rated current

Transformer capacity is 1000kVA

High-voltage side current: 1000/10/1.732=57.736A

Low-voltage side current: 1000/0.4/1.732=1443.418A

How to calculate the high-voltage side protection setting of 1000kva transformer?

The transformer capacity is 1000kVA, and the known high-voltage side current of the transformer is 57.736A.

Select the current mutual inductance 100/5, the magnification is 20 times, the calculation method of the secondary side current: 57.736/20=2.8868A.

How much current can a 630KVA transformer withstand?

There are two 250KW motors and one 132KW motor, is it enough?

KVA 1.5 current, 630KNA transformer about 945 current, not enough, just simple calculation of power and full load.

A 630KVA transformer cannot withstand two 250KW motors and one 132KW motor, 250KW+132KW motors, according to COSΦ=0.8, the apparent power of the motors does not exceed 500KVA, why not? Just don’t start at the same time.

If the motor adopts soft start or variable frequency start and there is no overload, it is still possible to use it under the condition of strengthening the heat dissipation of the transformer, depending on the working conditions.

It can be used, but it needs to add a capacitor to compensate for reactive power. The capacitor can be controlled in parallel with the motor. Now the total power of the motor = the capacity of the transformer. If the motor is fully loaded, the power factor is compensated to 1, and the transformer is a little overloaded, because the motor has not been considered. efficiency issues.

However, the general motor cannot be fully loaded. The transformer can be overloaded as long as the temperature rise does not exceed the limit. For example, the original natural cooling transformer can be cooled by a cooling fan, and the original air-cooled one can be cooled with water, so that the transformer can be overloaded by 20% or even 40%. run.

I’ve seen loads up to 160% and replace the transformer every year. Because of this saving, changing a large transformer will increase the monthly fixed fee for the power company. Our side is a few yuan per KVA per month, and there are other charges.

Saving energy does not save money, and saving money does not save energy. If you have to use it like this, just short-circuit the adjustment switch inside the transformer. It is possible to start without simultaneous, the rated current of the transformer is marked on its nameplate.

The capacity of the transformer is 630KVA, and two 250KW motors and one 132KW motor are required. The total power of the load is 632KW (total capacity: 790KVA), so this transformer cannot carry such a large load. It is recommended to use a transformer with a capacity of 1000KVA.

A 630KVA transformer cannot be used, and the long-term overload of the transformer is prone to problems.

What is the power factor of a 1000 kva transformer?

A 1000kVA transformer can output 600kW of active power when the power factor cosφ=0.6; but when the power factor cosφ=0.9, it can output 900kW of active power.

If 1 kWh of electricity is 1 yuan, when the power factor is 0.6, the transformer can generate economic benefits of 600 yuan/hour; when the power factor reaches 0.9, the transformer can generate 900 yuan/hour of economic benefits.

What is the no-load loss of a 10 kv dry-type transformer?

SC(B)10-1000KVA/10KV series dry transformer no-load loss standard is 1770W;

SC(B)11-1000KVA/10KV series dry transformer no-load loss standard is 1590W;

What is the no-load loss of a 10 kv oil-immersed transformer?

S11-1000KVA/10KV series oil-immersed transformer no-load loss standard is 1150W;

The no-load loss standard of SH15-1000KVA/10KV amorphous alloy oil-immersed transformer is 450W.

What is the primary variable current of a 1000 kva transformer?

Remember the current value of the high and low voltage sides of a transformer with a common capacity, and linear derivation can be performed for other capacities.

For a 1000KVA transformer, the calculated value of the current on the high-voltage side is 57.73, and the calculated value of the current on the low-voltage side is 1443.42.

Then remember this value, and other capacities can be derived from this. For example, for a 1600KVA transformer, the high-voltage side current is 1600/1000*57.73=92.368A, and the low-voltage side current is 1600/1000*1443.42=2309.472A

Daelim 1000kva Transformer

How many kilowatts of capacitors need to be configured for 1000Kva transformer reactive power compensation?

It is necessary to know the demand factor of the equipment and the power factor of each equipment to be able to calculate.

If you don’t know it, you can make a rough estimate, generally 45% to 75% of the transformer capacity for compensation.

If you have more inductive equipment, you can use 60~75% to compensate.

How to configure the compensation capacitor for a 1000KVA transformer?

The 1000KVA transformer should be equipped with a compensation capacitor with a capacity of 420kvar.

Factory natural power factor before compensation = 0.8. When the power factor is increased to 0.95 through capacitance compensation, the compensation capacitance is 0.42kvar per 1KW of power, so the capacity of the compensation capacitor that should be configured for a 1000KVA transformer = 1000*0.42=420kvar.

Calculate the reactive power compensation capacity according to the capacity of the transformer:

The efficiency of the transformer is generally 0.8, and the power factor under load is usually around 0.7. When the power factor increases from 0.7 to 0.95, the reactive power compensation capacity per KW is 0.691 kilowatts. Calculate the reactive power compensation capacity according to the capacity of the transformer:

Qc=transformer capacity (KVA)×0.8×0.691

The relationship between 1000 kW and 1000 kVA

1000 kilowatts is the active power power, and the motor power is 1000KW.

1000 kVA is the capacity, and the transformer capacity is 1000KVA, which includes active power and reactive power, because only the purely resistive load power factor is 1, and neither the inductive load nor the capacitive load is 1.

Generally, the load rate of the transformer is about 85%, and 1000KVA can carry a load of about 850KW.

How to identify the model of a 1000 kva transformer?

The model of the transformer usually consists of symbols indicating the number of phases, cooling method, voltage regulation method, winding core and other materials, as well as the transformer capacity, rated voltage, and winding connection method.

The following power transformer model code meaning: DSJLZSCSGJMBYDBK (C) DDGD.

D-single phase;

S-three-phase;

J- oil immersion self-cooling;

K-winding is aluminum wire;

Z – on-load voltage regulation;

SC-Three-phase epoxy resin casting;

SG-three-phase dry self-cooling;

JMB – local lighting transformer;

YD- single-phase transformer for testing;

BF(C) – control transformer;

DDG-Single-phase dry-type low-voltage high-current transformer

Note: The digital part behind the power transformer: the left side of the slash indicates the rated capacity (kVA); the right side of the slash indicates the rated voltage of the primary side (kVA).

For example 1: SJL-1000/10, it is a three-phase oil-immersed self-cooling aluminum wire, double-coil power transformer, the rated capacity is 1000 kVA, and the rated voltage of the high-voltage side is 10 kV. The model representation method: basic Model + design serial number – rated capacity (KVA) / high voltage side voltage For example 2: S7-315/10 transformer is three-phase (S) copper core 10KV transformer, capacity 315KVA, design serial number 7 is energy-saving.

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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.