Current transformer factory today to share with you what is the role of the current transformer?
In order to ensure the safety of electricity use, current transformers are often used, but many people do not know much about current transformers.
What are the current transformer types?
1. According to the use, it is divided into: measuring current transformers and protection current transformers.
When measuring the large current of alternating current, it is very convenient to use the current transformer for measurement to convert the measured current into a relatively uniform current, so that there is a certain standard. Moreover, it is very dangerous to directly measure the current and voltage on the line, so the use of current transformers solves this dangerous problem very well, and it plays a very good role in electrical isolation.
The current transformer for protection is generally used together with the relay device. When some faults such as piers and roads occur in the line, the relay device will send a certain signal, so as to cut off the circuit and protect the power supply system. effect. The effective working current of the protective transformer will only operate normally when it is several times or dozens of times larger than the usual current. It is precisely because of these functions that the protective transformer must have good insulation, good thermal stability and so on.
2. According to the installation method, it is divided into: pillar-type current transformer, through-type current transformer, bus-bar current transformer, bushing-type current transformer.
3. According to the classification of insulating medium, it is divided into: dry current transformer, gas insulated current transformer, oil-immersed current transformer, and pouring current transformer.
4. According to the principle, it is divided into: electronic current transformer, electromagnetic current transformer.
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Current Transformer Parameters
Current transformer parameters: LZZBJ9-10 300/5 0.5/10P10 LZZBJ9-10JC 200/5 0.2S class/20VA
The first letter: L stands for current transformer.
The meaning of the second letter is its way, different letters represent different ways, A stands for through-wall type; M stands for bus-bar type; V stands for structure inversion type; Z is pillar type; D is for single-turn through-type grounding detection ; J is zero sequence; W means anti-contamination; R means exposed winding.
The third letters are also different, and different letters have their own unique meanings: Z means epoxy resin casting; Q means gas insulating medium; W means special for microcomputer protection; C means porcelain insulation.
Fourth letter: B stands for protection level; D stands for D level; Q stands for reinforced type; C stands for differential protection.
What is the function of the current transformer
1. Because the output current of most transmission lines and electrical equipment is relatively large, and some even exceed several thousand amperes, but the instruments we use to measure the current can generally measure a current of tens of amperes at most, so it cannot be compared with the electrical current. The current of the equipment is matched, and the current transformer can reduce the large current, so that the two can be matched, so that the current of each line can be better monitored and measured.
2. Since the space inside the measuring instrument is generally small, it is generally unable to withstand high voltage. When someone operates the meter to read the meter, or when the circuit is measured and tested, if it is not isolated from the high voltage, then the operation The safety of human life will not be guaranteed, and the current transformer can provide insulation protection for the operator to prevent the human body from being hurt by high voltage.
2. What aspects should be paid attention to when using current transformers, current transformer manufacturers share the following knowledge.
1. Under normal circumstances, the current transformers are marked according to the minus polarity. If the polarity connection is wrong, the accuracy of the current measurement value will be affected, and the line will be short-circuited.
2. During use, the grounding point should be set in the secondary circuit, and it is necessary to ensure that the connection position is kept in good condition, and the current transformer can generally be set at the terminal of the box, so as to avoid the insulation breakdown between the windings and the formation of high voltage, which is harmful to the user's safety. Injury to personal safety. In addition, the secondary winding cannot be opened, otherwise dangerous accidents such as overheating or high voltage will occur, which will not only burn the winding, but also endanger personal safety.
3. During use, you should also check the standard value of its rated current to see if it has reached the standard range of use. If not, it will cause the current transformer to burn out. However, the current transformer with excessive current cannot be selected, otherwise it will affect the final measurement accuracy. It is recommended that you choose according to the actual situation, and before installation, you should learn more about the installation method and precautions to avoid accidents.
The above is the introduction of the role of the current transformer and the relevant content that should be paid attention to when using the current transformer. I hope it can help friends in need.
China Gewei Electronics focuses on R&D and production of various current transformers, if you need current transformer manufacturers (low-voltage current transformer manufacturers), current transformer safety manufacturers (current transformer safety manufacturers), coil current transformer (coil current transformers) etc., you can contact us to customize the current transformer.
pecializing in the production of various types of color ring inductors, current transformer,beaded inductors, vertical inductors, tripod inductors, patch inductors, bar inductors, common mode coils, high-frequency transformers and other magnetic components.
Post time: Oct-27-2022