Transformer high voltage 10KV why there are 10 5KV, 11KV

The rated voltage on the high-voltage side of the transformer is 10kV, but the voltage on the line will be higher than the rated value, just like the low-voltage side is rated at 380V, but the voltage on the secondary outlet side of the transformer is often higher than this value, as long as the voltage fluctuation does not exceed the allowable value.

This and 11kv you are talking about are the secondary side of the transformer.

The secondary winding is equivalent to the power supply equipment, so the voltage loss inside the transformer needs to be considered.

When the short-circuit voltage is less than 7% or when it is directly connected to the user, the secondary winding voltage of this transformer is 5% higher than that of the network, as far as you say.

If the short-circuit voltage of the transformer is greater than or equal to 7%, then the rated voltage of the secondary winding.

That's 10% higher than the voltage of the network, like you said 11kV.

It is mainly considered that there is a voltage loss within the distance from the transformer to the electrical equipment or the distribution room, and the rated voltage on the low-voltage side of the transformer is slightly higher than the bus voltage, which is mainly considered as the problem of voltage loss, not the problem of voltage regulation range.

Transformer parameters:

Operating frequency. The core loss of the transformer has a great relationship with the frequency, so it should be designed and used according to the frequency used, which is called the working frequency.

Rated power. At the specified frequency and voltage, the transformer can work for a long time without exceeding the output power of the specified temperature rise.

Rated voltage. Refers to the voltage allowed to be applied on the coil of the transformer, which shall not be greater than the specified value when working.

voltage ratio. It refers to the ratio of the primary voltage and the secondary voltage of the transformer, and there is a difference between the no-load voltage ratio and the load voltage ratio.

No-load current. When the transformer is secondary open, there is still a certain amount of current in the primary, and this part of the current is called no-load current. The no-load current consists of a magnetizing current (which generates magnetic flux) and an iron loss current (which is caused by core loss).

For a 50Hz power transformer, the no-load current is basically equal to the magnetizing current.

No-load loss. Refers to the power loss measured at the primary level when the transformer is secondary open. The main loss is the core loss, followed by the loss of the no-load current on the copper resistance of the primary coil (copper loss), which is very small.

10kva is 10kw, how much power can be carried = 10kva * conversion efficiency.

A transformer is a device that uses the principle of electromagnetic induction to change the alternating voltage, and the main components are the primary coil, the secondary coil and the iron core (magnetic core).

The main functions are: voltage conversion, current conversion, impedance conversion, isolation, voltage regulation (magnetic saturation transformer), etc.

The main parameters include: rated capacity, rated voltage and its tapping, rated frequency, winding coupling group, and rated performance data (impedance voltage, no-load current, no-load loss and total load loss weight.

Rated capacity (kVA): Rated voltage. The capacity that can be conveyed during continuous operation at rated current.

Rated voltage (kv): The working voltage that the transformer can withstand when it runs for a long time. In order to meet the needs of grid voltage changes, the high-voltage side of the transformer has a tap to adjust the output voltage of the low-voltage side by adjusting the number of high-voltage winding turns.

Rated current (a): The current that the transformer is allowed to pass through for a long time at the rated capacity.

No-load loss (kw): The active power drawn when applied to the terminals of one winding at the rated voltage of the rated frequency, and the rest of the windings are open. It is related to the performance and manufacturing process of the core silicon steel sheet, and the applied voltage.

No-load current (%) The current passing through the primary winding when the transformer is no-load on the secondary side at the rated voltage. It is generally expressed as a percentage of the rated current.

Load loss (kw): The power consumed by the transformer when the secondary winding of the transformer is short-circuited and the rated current is introduced at the rated tapping position of the primary winding.

The impedance voltage (%) short-circuits the secondary winding of the transformer, and slowly increases the voltage in the primary winding, when the short-circuit current of the secondary winding is equal to the rated value, the voltage applied on the primary side at this time. It is generally expressed as a percentage of the rated voltage.

Number of phases and frequency: Three-phase starts with s, single-phase starts with d. The Chinese national standard frequency f is 50Hz. Countries with 60Hz abroad (such as the United States).

Temperature rise and cooling: The difference between the temperature of the winding or upper oil of the transformer and the temperature of the surrounding environment of the transformer is called the temperature rise of the winding or upper oil surface. The temperature rise limit of oil-immersed transformer winding is 65K, and the oil surface temperature rise is 55K.

There are also many cooling methods: oil immersion self-cooling, forced air cooling, water cooling, tubular type, sheet type, etc.

Insulation level: There is an insulation grade standard. An example of how to represent the insulation level is as follows:

The high-voltage rated voltage is 35kv, and the low-voltage rated voltage is 10kv, and the insulation level of the transformer is expressed as li200ac85 li75ac35, wherein li200 indicates that the transformer's high-voltage lightning impulse withstand voltage is 200kv, the power frequency withstand voltage is 85kv, the low-voltage lightning impulse withstand voltage is 75kv, and the power frequency withstand voltage is 35kv

Based on the average power factor, a 10kva transformer can provide (10kva kW of active power) to a load. If the amorphous alloy transformer can completely replace the new S9 series distribution transformer, such as the annual demand of 10kV distribution transformer calculated at 50 million kVA, then it can save more than 10 billion kWh of electricity a year.

At the same time, it can also bring good environmental benefits of building fewer power plants and emit less greenhouse gases into the atmosphere, which will greatly reduce the direct pollution to the environment and make it a new generation of green products.

Transformer load operation.

When the transformer is running under load, when the secondary current increases, the transformer must maintain the main magnetic flux in the iron core unchanged, and the primary current must also increase accordingly to achieve a balanced secondary current.

The secondary active power of the transformer is generally = the rated capacity of the transformer (kva) and the power factor of the transformer) = kw.

Three-phase transformers and three-phase transformer banks can be connected into star, triangle and zigzag, which are represented by Y, D and Z symbols on the high-voltage side and Y, D and Z symbols respectively on the low-voltage side. Depending on the wiring combination of the three-phase winding, there are 12 wiring groups.

Generally, the label is rated voltage, and the final load of how much power can be carried depends on the conversion efficiency of the transformer, just like our toroidal transformer conversion efficiency is more than 90%, 10kva is 10kw, how much power can be carried = 10kva * conversion efficiency. Hope it helps.

It can carry 8-9kw, depending on the load type.

The 10kV of the 10kV high-voltage line refers to the voltage between the lines, that is, the "line voltage".

Its voltage to ground is 10, i.e. the "phase voltage" is.

Line voltage 380 volts and phase voltage 220 volts.

The transformer name plate has voltage level information. The bench transformer or floor box transformer that you usually see on the street is generally of 10kV voltage level, and the transformers used by general enterprise customers are basically of this voltage level.

In addition, there are some large-scale transformers specially built in substations, with voltage levels ranging from 220kV to 110kv to 35kv to 10kv, which are generally invested and built by power supply enterprises or individual super-large electricity customers.

What is the case that the outgoing neutral line is 420 volts for any live wire.

ABC three-phase line voltage 380 phase voltage 220 is the usual household electricity voltage.

Generally, there is 6kV, and if it is a phase voltage, it is 220V).

Generally, the commonly used transformer BA10kV is transformed into a line voltage of 380 volts and a phase voltage of 220 volts.

There is a DAO line in the three-phase four-wire system, and the grounding wire in the power distribution room of the transformer is commonly known as the zero line.

The other three wires are called the firing wire.

The voltage between any two of the three live wires is a line voltage of 380 volts.

The voltage between any live wire and the neutral wire is phase, and the voltage size is 220 volts.

The nameplate on the transformer bai has a steel seal engraved very clearly, you can see for yourself, if you don't dare to get close to dao, take the version of the telescope to see it.

The right transformer in the community is first connected to the basement or power distribution room of the community, when it comes in from the outside, it is 10kv, and after entering the transformer, it becomes 380 out, and one of the live wires is taken. With the zero line, it is 220 when you enter the house.

This is the general situation.

Transformer 10kv means that the voltage of the transformer is 10kv.

10kv = 10,000 volts = 10,000 volts

10kV high-voltage refers to the voltage of 10000V.

High-voltage electricity refers to the electrical connection line with an AC voltage of more than 1000V or a DC voltage of more than 1500V of the distribution line. AC low voltage below 1000V or DC voltage below 1500V is low voltage electricity.

High-voltage power supply refers to the safe, reliable, continuous and qualified sales of electric energy to the majority of power customers through high-voltage transmission and distribution devices to meet the needs of the majority of customers for economic construction and daily electricity.

First, the capacity of transformers in China is calculated by a standard calculation formula, so there is no accurate answer. 10kV transformers from 30kVA to 2500kVA are very common, generally KVA these kinds.

Second, the main classification of transformers:

1. According to the number of phases:

1) Single-phase transformer: used for single-phase load and three-phase transformer state volt group.

2) Three-phase transformer: used for the rise and fall voltage of the three-phase system.

2. According to the use:

1) Power transformer: used for the rise and fall voltage of the transmission and distribution system.

2) Instrument transformers: such as voltage transformers, current transformers, measuring instruments and relay protection devices.

3) Test transformer: It can generate high voltage and carry out high voltage test on electrical equipment.

4) Special transformers:

3. According to the cooling method:

1) Dry-type transformer.

2) Oil-immersed transformer.

4. According to the form of winding:

1) Double-winding transformer.

2) Three-winding transformer.

3) Autotransformer.

5. According to the form of iron core:

1) Core transformer: used for high-voltage electric search force transformer.

2) Amorphous alloy transformer: Amorphous alloy core transformer is a new type of leakage magnetic material, the no-load current drops by about 80%, and it is a distribution transformer with ideal energy-saving effect, especially suitable for rural power grids and developing areas and other places with low load rate.

3) Shell transformer.