10 kv Oil Filled Transformer
Fault Diagnosis and Analysis of 10 kv Oil Filled Transformer 10 kv Oil filled transformer
A high-quality 2000 kva transformer must have the characteristics of low failure rate, maintenance-free, low loss and energy saving.
But there are so many different 2000 kva transformers on the market today. How do you choose?
First of all, as you know, 2000kva transformers are mainly divided into two categories: dry-type transformers and oil-immersed transformers.
But how to choose between these two categories?
Dry-type transformers are currently more expensive than oil-immersed transformers, and their capacity is smaller than that of oil-immersed transformers.
But if you are using transformers in complex buildings, then you should choose dry-type transformers, because the space in these places is generally small, and the advantage of dry-type transformers is that they require less space.
Oil-immersed transformers generally require an independent substation, so it is commonly used in open spaces.
If oil-immersed transformers are installed in urban areas or bitcoin mines, the first choice must be pad mounted transformers. Because the pad mounted transformer has the advantages of excellent stability and almost no maintenance.
After deciding which type of 2000 kva transformer you want to choose, you need to choose a good transformer manufacturer.
How to tell if you are dealing with a manufacturer or a trader?
You can directly ask the other party to issue the relevant certificate of their own company, and log in to the official website of these certificates to check the holder of this certificate.
Such as Daelim Belefic, a transformer manufacturer with more than 16 years of experience in production and design. It has obtained IEEE, ANSI, C57.12.00, IEC60076, CSA, DOE and other industry standard certifications.
This means that the transformers provided by Daelim are guaranteed and they can provide you with customized services according to your needs.
Below, I will tell you everything about the 2000kva transformer in detail.
2000kva oil-immersed transformer consists of iron core, low voltage coil, high voltage coil, body insulation, high and low voltage leads, voltage regulating switch, oil tank, bushing and other accessories.
The 2000kva oil-immersed transformer adopts a three-phase wound iron core structure, and the iron core material is made of high-quality grain-oriented magnetic silicon steel sheet.
The iron core is manufactured with advanced technology, with low loss and low noise. The structure is fully considered to reduce loss and overexcitation to meet the requirements of heat dissipation and transportation. The grounding of the iron core is led out from the top of the fuel tank by a bushing with a power frequency withstand voltage of 3KV. bottom of the transformer. The insulation material of the body is made of high-quality high-performance high-density cardboard. The high and low voltage leads are made of soft copper, and the oil tank adopts a bell-shaped structure to reduce the factor of oil leakage.
The 2000kva oil-immersed transformer adopts a corrugated oil tank with a fully sealed structure. The top of the oil tank is equipped with high and low voltage bushings, pressure relief devices, oil level indicating devices and gas relays.
The nameplate and temperature indicating device of the 2000kva transformer are installed on the side of the transformer and in the observation position.
A jack device is installed at the bottom of the 2000kva oil-immersed transformer shell, and a horizontal traction device is installed at the lower part to facilitate the movement of the transformer without lifting equipment.
The body, oil tank, cooler and related connection parts of the 2000kva oil-immersed transformer have been tested to ensure no leakage or deformation.
Transformers and metal outer surfaces are treated with anti-corrosion treatment.
The 2000kva dry-type transformers currently on the market are mainly epoxy resin cast dry-type transformers with a rated capacity of 2000kva.
This transformer is cast with a thin layer of epoxy resin for good insulating properties.
And this transformer also has excellent short-circuit resistance and lightning shock resistance.
The shell of the 2000kva dry-type transformer is made of stainless steel, which is safe and reliable, and the protection level reaches IP20. It has excellent mechanical strength and will not deform under the action of short-circuit electric power. Low loss, low temperature rise and high efficiency.
2000kvA dry-type transformers are generally used indoors at an altitude of 1000 meters or less, and can work normally at a high temperature of 40 degrees Celsius.
Due to the safety and reliability of the 2000kvA dry-type transformer, it is directly installed in the docks, power plants, residential areas and other places with large power consumption.
2000 kva pad mounted transformer refers to a pre-installed transformer with a rated capacity of 2000 kva. It integrates transformers, low-voltage electrical equipment and high-voltage equipment into a compact layout.
2000 kva pad mounted transformer has the characteristics of strong complete set, small size, compact structure, energy saving and environmental protection, beautiful appearance, low noise, safe and reliable operation, and movable.
The 2000kva pad mounted transformer is currently the most widely used distribution transformer in the city, and it belongs to a type of oil-immersed transformer. Because of its easy installation, good integrity and convenient maintenance, it is widely used in residential communities, commercial complexes, factories, mines, oil fields and other places.
2000 kva pad mounted transformer refers to a pre-installed transformer with a rated capacity of 2000 kva. It integrates transformers, low-voltage electrical equipment and high-voltage equipment into a compact layout.
2000 kva pad mounted transformer has the characteristics of strong complete set, small size, compact structure, energy saving and environmental protection, beautiful appearance, low noise, safe and reliable operation, and movable.
The 2000kva pad mounted transformer is currently the most widely used distribution transformer in the city, and it belongs to a type of oil-immersed transformer. Because of its easy installation, good integrity and convenient maintenance, it is widely used in residential communities, commercial complexes, factories, mines, oil fields and other places.
A 2000KVA transformer can carry a load of 1700 kW if it is all electrothermal (resistive) loads.
But if all of them are inductive loads such as motors, they will be discounted by 60%, which is a motor load of 1200 kilowatts.
If there are both, then 30% off (1400KW) or 20% off (1600KW), it depends on which load accounts for more proportion.
In fact, according to the regulations of the Electric Power Bureau, the maximum load is 85% of the full load, which is 1700KVA. Maximum line current is 2586 amps.
Calculate like this: 1700KVA÷380V÷1.732=2.5859446KA=2585.9949A≈2586A≈2600A.
The transformer did not shut down this statement, it should be withdrawn from operation. It can be realized by switching off operation.
The basic principle is to cut off the circuit breakers and isolating switches on the high and low voltage sides of the 2000kva transformer.
To turn off the transformer, it is necessary to power off the upstream of the 2000kva transformer. The upstream high-voltage power supply of the 2000kva transformer has a circuit breaker and a drop insurance.
Stop the low-voltage side load first, and disconnect the low-voltage side circuit breaker. Then stop the high-voltage side power supply of the 2000kva transformer, and pull the high-voltage side circuit breaker to the test or maintenance position.
The input voltage of a 2000 kVA transformer is 380 volts, but the voltage into the transformer needs to be determined according to the voltage of the power supply system, generally 10 kV, 30 kV, etc.
Copper core plastic cables should be used.
Why?
Because the current i=2000kva/(1.732*10kv*0.9)=128a on the high-voltage side (10kv) of the 2000kva transformer.
The current carrying capacity of the cable of 70 can reach 140a. Considering the poor heat dissipation of buried laying, cable production quality, power factor, etc., it is recommended to use yjv22-10kv-3*95 copper core plastic cable.
For the commonly used 10(6)/0.4kV substation, the low-voltage phase busbar of 2000kVA transformer is 2 (125×10) mm per phase, and the PE busbar is 80x8mm.
For SF6 circuit breakers, the selection method is the same as that of vacuum circuit breakers, but in power distribution systems, vacuum circuit breakers are mostly used.
1. Select the type of circuit breaker according to the cabinet type of the transformer. For indoor fixed 10KV switchgear, most of them use ZN28 vacuum switch, equipped with a spring operating mechanism, which can be operated by AC, DC electric operation, or manual operation;
For indoor removable 10KV switchgear (such as KYN type), VS1 type vacuum switch can be selected, equipped with a spring integrated operating mechanism, which can be operated by AC, DC electric operation, or manual operation;
2. Select the rated current of the circuit breaker. Generally, there are four types of power distribution circuit breakers: 630A, 1000A, 1250A, and 1600A. You should calculate the load current flowing through the circuit breaker according to the load situation, and then select the rated current after leaving a margin; for a 2000KVA transformer, its Rated current I=2000/(1.732*10)=115.5A, a 630A circuit breaker can be selected initially, but it should also be verified;
3. Verify the breaking current of the selected circuit breaker. Calculate the short-circuit current value of the installation site of the circuit breaker, and compare it with the breaking current value of the circuit breaker initially selected. After leaving a margin, the breaking current value of the circuit breaker should be greater than the maximum short-circuit current value of the installation site, so as to ensure In the event of a short circuit, the circuit breaker can operate reliably and remove the fault without damage to itself. Generally, the rated short-circuit breaking current values of 10KV vacuum circuit breakers are mostly 20KA, 25KA, 31.5KA, 40KA, corresponding to the above 630A, Four rated currents of 1000A, 1250A and 1600A; if the installation site of the 2000KVA transformer is relatively close to the outlet of the substation, and the maximum short-circuit current value is 26KA, then the rated short-circuit breaking current of the 630A switch is 20KA, which cannot meet the requirements of the point of use It is necessary to choose a circuit breaker with a rated current of 1250A and a rated short-circuit breaking current of 31.5KA.
4. Check other cases. Such as phase-to-phase distance, installation size, interlocking situation, whether there is blocking, whether it has an overcurrent coil, whether it has a voltage loss, etc.
If your factory equipment does not work all day, the critical load is very close to the capacity of the transformer, and the load is relatively stable. Then you can choose a 2000Kva transformer.
But if the equipment in your factory needs to be switched on and off every day, the load changes are relatively large, and there are people on duty, then you can consider using two units to run in parallel.
1.2 sets of 1000KVA transformers are more economical to operate than 1 set of 2000KVA transformers. When the scheduling is more appropriate, the total running cost will be lower.
2. Two 1000KVA transformers have high power supply reliability, and the transformers can also be switched on and off according to the plant load.
3. From the point of view of operational reliability, it is better to use two units. If two units are running at the same time, if one unit fails, the other unit can carry an important primary load. The reliability of power supply with a single unit is not high.
4. Two 1000kva transformers have the advantage of flexible scheduling, one is used when the load is light, and two are used when the load is heavy.
1. One time investment is relatively large.
2. The number of supporting equipment is also doubled.
3.The installation location should also be larger.
4.The workload of maintenance is also larger.
The advantages and disadvantages of a 2000kva transformer are just the opposite of those of two 1000kva transformers.
Under normal circumstances, the no-load loss of the transformer (called iron loss) is about one thousandth of the transformer capacity; the rated loss of the transformer (called copper loss) is about one percent of the transformer capacity. S11 2000KVA type transformer enterprise standard: no-load loss 1960W load loss 17820W .
Because the rated capacity of the transformer multiplied by the coefficient = rated current.
Therefore, the primary side current of 10KV/0.4KV, 2000KVA power transformer: I1=2000/(1.732*10)=115.47A,
Secondary side current: I2=2000/(1.732*0.4)=2886.83A.
A 2000 kVA transformer supplies a low-voltage power distribution cabinet. What size universal switch do I use in the low-voltage power distribution cabinet?
If 10KV/0.4KV
Transformer primary side current: 116A Secondary side current: 2880A
The main input circuit breaker selects 3000A-3500A
Can be equipped with three 1000A outlet cabinets.
The main busbar can use 80*8 copper busbar, but it is recommended to use 100*10 copper busbar.
Do you need to make sure that your 2000kva transformer is an oil immersed transformer? Or a dry-type transformer? ,
The requirements for the environment are different between them.
Under normal circumstances, the 2000kva transformer can be below 1000 meters above sea level. If you have special requirements, such as high altitude, frequent lightning activities, wet tropics, dry tropics or areas with severe salt spray, etc. You can negotiate with the manufacturer, generally can meet the requirements.
The no-load loss of a 2000kVA dry-type transformer is 3050W, and the load loss is 14450W. If it runs at full load, the loss per day is multiplied by 24 hours.
Load loss 14450*24H=346800W
No-load loss is 3050W*24H=73200W
The installation requirements of most countries are that the safe installation distance of two 2000kva dry-type transformers is more than 1 meter. The author recommends that you choose a safe distance of more than 1.5 meters.
High pressure to low pressure and ground is greater than 1000 megohms, high pressure to ground, low pressure to ground is also greater than 1000 megohms is qualified.
You can use a 2500 volt megohmmeter to measure.
Since the transformer is a large-capacitance device, the measurement will take a period of time. When the speed reaches 120/MIN or more, the normal operation is more than 30S.
Note: After the measurement, keep its speed until it is separated. Otherwise, it is easy to damage the instrument due to the discharge of the device under test..
If the measurement can meet the above parameters..
Prove the equipment is in good condition!
Yes, unless the power factor COSΦ is less than 0.5, there will be problems! Is the transformer loss will be larger! As long as the power of the equipment below is not greater than the maximum active power that the transformer can output, there is no problem!
According to the conventional power factor of 0.95, a 2000KVA transformer will output 1900KW of active power at full load.
However, the economic operating capacity of the general transformer is about 80% to 85%, so that the loss of the transformer will not be too high, and the service life will be longer!
So as long as the reactive power compensation is in place and the power factor is not lower than 0.85, it can be used!
Transformers in normal operation are equipped with switchboards, and there are three AC ammeters on the switchboards to judge whether the transformer is overloaded according to the load current value usually used. Under normal circumstances, during the operation of the transformer, if the operating current exceeds the rated current on the nameplate, it is in overload operation.
The rated voltage of the primary side of the 2000kva transformer is 10KV, and the voltage of the secondary side is 0.4KV. According to the formula “rated voltage of 10,000 volts, the coefficient is just 0.6” and “rated voltage of 400 volts, the coefficient of 1.445”, the high-voltage side The current is (0.06×2000=120A), and the low-voltage side current is (1.445×2000=2890A).
Download Resource
Fault Diagnosis and Analysis of 10 kv Oil Filled Transformer 10 kv Oil filled transformer
Padmounted Transformer in Construction Work The pad mounted transformer is widely used in electrical engineering
Nine Q&As About The Solar Thermal Power Plant Daelim is the top Chinese brand of
Copyright © Daelim Belefic 2022. All Rights Reserved. Website SEO by Triplesails
