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Anonymous users2024-02-151: The output power current you require va
2: Type: EI, C, R, ring, O-type.
3: Iron core material: domestic or imported and high and low permeability.
4: Enameled wire: copper wire or aluminum wire.
5: Rated working frequency: 50 or 60hz
6: Primary no-load current: large or small.
7: Whether to add a shielding layer.
8: Appearance size and installation method, etc.
9: The most important thing is **.
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Anonymous users2024-02-14The ready-made iron core can change the number of turns of the sub winding, and tell the power on it, or you can add the wiring and installation method
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Anonymous users2024-02-13The power of each level of voltage. V a plus wiring and installation.
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Anonymous users2024-02-121. The capacity of each voltage level.
2. Oil-soaked or dry.
3. It should be a single item.
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Anonymous users2024-02-11Power. The most important thing is to figure out whether it is no-load power or load power.
The power of normal materials is to be discounted.
Or you can ask for a secondary current.
Volume. The greater the power, the greater the volume.
Use. There are different models for different applications.
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Anonymous users2024-02-10Winding it yourself, method, first determine the power you need to output, then select the winding wire and core, according to the formula: p=u r, determine r, and then determine the number of turns of the primary side winding, after the number of turns of the first side is determined, the corresponding number of turns should be calculated. What you need is four output voltage levels, you can use each voltage level to wind separately and use one winding to leave different taps, ok
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Anonymous users2024-02-09Calculate the power of the transformer:
Transformer power = output voltage x output current.
The power of the single-phase transformer is obtained from the total power of electricity * 120% (the efficiency is calculated as 80%).
The power of the three-phase transformer is calculated as follows (taking the phase voltage 220V and the line voltage 380V as an example).
1. Three-phase rated power = rated current * rated line voltage (380V) = 3 * rated current * rated phase voltage (220V).
2. The three-phase power is different, calculated according to the maximum power of one phase multiplied by 3, for example, phase A is 9kw, phase B is 10kw, phase C is 11kw, p=3*11=33kw.
3. The transformer power factor is generally also), then, in the above example, the total power of the transformer = 33.
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Anonymous users2024-02-081. Working 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.
2. 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.
3. 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.
3. 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.
4. 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.
5. 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 chain loss (copper loss) caused by the no-load current on the copper resistance of the primary coil, which is very small.
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Anonymous users2024-02-07The transformer operates under the specified environmental conditions, and the main technical parameter data are as follows, which can usually be consulted on the transformer nameplate.
1.Rated capacity: the capacity of the rated voltage and rated current to be transmitted in continuous operation (i.e., the apparent power of the transformer).
2.Rated current: The current passed by the transformer when it is operating at the rated capacity and rated voltage.
3.Rated voltage: The voltage value specified in the design of the transformer for long-term operation.
4.Rated frequency: The core loss of the transformer has a great relationship with the frequency, so the frequency needs to be used to design. In China, the frequency of power transformers is 50Hz
5.Rated power: It usually refers to the output power of the power transformer when it works for a long time without exceeding the limited temperature under the specified working frequency and voltage. It is related to the cross-sectional area of the core, the diameter of the enameled wire, etc.
7.Short-circuit voltage: The voltage value applied to the primary winding when the secondary winding of the transformer is short-circuited in the transformer and gradually boosted to the rated value of the current in the winding on the primary trembling winding.
8.Short-circuit loss: The power consumed by the transformer when the secondary winding of the transformer is short-circuited and the rated current is introduced into the primary winding, that is, the copper is lost (caused by the resistance of the transformer coil).
9.No-load loss: The loss of the transformer core when the transformer is under the second no-load (open circuit) of the transformer under the rated voltage, that is, the iron loss (hysteresis loss and eddy current loss).
10.No-load current: The (excitation) current that passes through the primary winding at the rated voltage of the voltage device at the second no-load is both the no-load current.
11.Auxiliary engine loss: the motor drives the fan to ventilate and cool down, drives the oil pump to force the flow of oil, strengthens the flow of the oil side, and consumes energy.
12.Insulation resistance: The size of the insulating electric group indicates the insulation performance between the coils of the transformer and between the coils and the core.
13.Number of phases: Single-phase starts with d, three-phase starts with s
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Anonymous users2024-02-06Summary. Strictly speaking, the secondary voltage of the transformer should refer to the secondary no-load voltage when the rated voltage is connected at the primary time. For example, for a 10000V 400V power transformer, 400V is its no-load voltage, not the working voltage with rated load (full load terminal voltage).
What does this transformer parameter mean? Thank you.
This question is up to me, it takes a little time to type, so please be patient.
Strictly speaking, the secondary Zheng's voltage of the transformer should be the secondary no-load dispersion voltage when the rated voltage is connected to the primary level. For example, for a 10000V 400V power transformer, 400V is its no-load voltage, not the working voltage with rated load (full load terminal voltage).
If two channels output at the same time, the power output should be met at the same time, that is, the primary capacity should be equal to the sum of each secondary capacity.
Thank you for your question.
The power of the finished transformer has been fixed, and if you want to change the output power, you must even change the primary wire diameter, because the primary power is secondary power, and at the same time, the window space of the iron core may not be able to accommodate the increased wire diameter. The secondary can be changed to a larger voltage, but it is also limited by the core window space and primary power, and the enameled wire with a smaller diameter than the original wire must be rewound (the voltage increases and the current decreases the original power), because the number of turns of the original coil must be increased by nearly double.
Generally speaking, the capacity of 1kVA can drive the left and right motors (and the power factor of the motor. >>>More
The ** of the transformer is about a few hundred yuan per unit, the cheap one has one or two hundred yuan, and the expensive one has several thousand yuan. Different types of transformers** are also different. In terms of categories, the classification of commonly used transformers can be summarized as follows: >>>More
Friend, you have confused the rated capacity of the transformer with the capacity of the test transformer. The rated capacity of the transformer refers to the ability of the transformer to run with load, and the capacity of the test transformer is only related to the test load, that is, the capacity of the test transformer and the test console are matched, just like the text description of the annex, because the test console has limited current resistance, ball gap and other protection measures, and the output of the test transformer will be cut off if the protection setting value of the test console is exceeded, so as to protect the transformer and the console from destruction. At the same time, it prevents unnecessary damage to the DUT due to excessive test current.
There are two ways to regulate the voltage of dry-type transformer: one is on-load voltage regulation, which is relatively simple, and directly adjusts its control switch. The second is non-excitation voltage regulation, dry-type transformer non-excitation voltage regulation is through the adjustment of the transformer itself, and there are two kinds of arrangement of the connecting piece, there are two rows up and down, three contacts above, three contacts below, and the other is arranged left and right, three on the left and right. >>>More