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Anonymous users2024-02-08The first floor is correct. However, the transformer is generally connected to the rectifier circuit first, then connected to the power amplifier board, directly connected to the power amplifier board, and beware of burning the plate.
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Anonymous users2024-02-07If your power amplifier power is larger than the transformer power, it may cause the transformer to overload, then the transformer will be burned, if the model of the transformer is not right, the output voltage may be greater than 24V, at this time your power amplifier board may be burned, so, the seller is still very responsible, the transformer you bought back can not be used directly before the test, first of all, confirm whether the transformer is normal, or whether the model matches your power amplifier and speaker, if you do not test, use it directly, The seller will certainly not be held responsible. If it is tested and there is a problem, you can return it directly.
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Anonymous users2024-02-06Generally, the transformer must be strictly inspected before leaving the factory, but some factories will test it casually, and some transformers may exceed 12V when the transformer voltage output is not connected to your speaker, which may not be good for your speaker, or the output power is greater than what your board bears, it may burn your speaker, or the output power does not meet the power requirements of your speaker, there will be a lot of noise or the speaker does not work properly. According to **, it seems that the quality of his transformer is not --- hehe.
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Anonymous users2024-02-05To put it simply, the seller is not sure whether the transformer in your hand is normal. So you need to test it.
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Anonymous users2024-02-04It doesn't matter if it's unpredictable or not. Ignore people and tell him to return the goods...
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Anonymous users2024-02-03The test transformers currently provided by the high test electrical test are: dry-type test transformer, portable withstand voltage tester, oil-immersed test transformer, etc., when choosing the test transformer, the following points are mainly considered:
1.Current. The rated output current of the test transformer in should be greater than the current required by the test product, i.e., in>is. The current required by the test sample can be estimated according to its capacitance, is=us w cx, where cx includes the test capacitance and additional capacitance.
2.Capacity. According to the rated current and rated voltage of the output of the test transformer, the capacity of the test transformer can be determined, that is, p=unin.
3.Voltage. According to the requirements of the test product, the test transformer with appropriate voltage is selected firstly, so that the rated voltage of the high-voltage side of the test transformer is higher than the test voltage US of the tested product, that is, un>us.
Secondly, it is necessary to check whether the low-voltage side voltage required by the test transformer can match the on-site power supply voltage and voltage regulator.
According to the standards issued by the ministry, the voltage level of the test transformer in China is kv, etc.; Capacity levels are KVA and so on.
Based on the calculation results, the required test transformer can be selected by checking the standards issued by the ministry. If there are special requirements, test transformers with special specifications can generally be ordered from the manufacturer.
Contact: 027-65021829
The DC resistance of the transformer refers to the DC resistance value of each phase winding, and the purpose of measuring the DC resistance is to check whether there is an inter-turn short circuit inside the three-phase winding. Because if there is an interphase short circuit inside the transformer, the short-circuit current value is very large, it is easy to burn the transformer, and the phenomenon of fault manifestation is also obvious, and the appearance is easy to judge; However, if there is a short circuit between the windings of one of the phases, the short-circuit current value is very small, and the gas protection of the transformer will act as a trip, but it is difficult to see whether the transformer itself is faulty from the appearance of the transformer. By measuring the DC resistance of each phase, it is easy to determine whether there is an inter-turn short circuit by comparing the resistance values of the three phases >>>More
It may be that a vortex has been generated.
For example, if an insulated wire is wound around an iron core, and after the alternating current is turned on, the current becomes a closed loop in the metal block. >>>More
The impedance voltage is the ratio of the voltage applied by the primary winding (short-circuit voltage) to the rated voltage when the short-circuit current of the secondary winding reaches the rated current. The impedance voltage uk (%) is one of the important economic indicators related to the cost, efficiency and operation of the transformer and one of the main parameters for the condition diagnosis of the transformer.
Boil more water and it will be tasteless, basically within 5 times, it will be tasteless.
The contact of the unloaded tap-changer is generally made by linear contact, which ensures that it is electrically conductive. If the power is not interrupted, the voltage is directly regulated, which will cause the dynamic and static contacts to indicate electrical burns, and can cause the decomposition of transformer oil under the action of a strong arc, resulting in combustible gas; At the same time, due to the electrical burn, the contact surface of the contact will be more bad, affecting the flow effect, resulting in local high temperature resulting in transformer oil aging and thermal decomposition, which will precipitate combustible gas, which may lead to the transformer in the long term. >>>More