Through the understanding of power automation companies, we analyze the high probability of transformer failure during use and introduce targeted prevention and solutions. Copper Tube Terminals Without Checking Hole Our company specializes in the production and sales of all kinds of terminals, copper terminals, nose wire ears, cold pressed terminals, copper joints, but also according to customer requirements for customization and production, our raw materials are produced and sold by ourselves, we have their own raw materials processing plant, high purity T2 copper, quality and quantity, come to me to order it! Copper Tube Terminals Without Checking Hole,Cable Lugs Insulating Crimp Terminal,Cable Connector Tinned Copper Ring Terminal,Tubular Cable Lugs Crimp Terminal Taixing Longyi Terminals Co.,Ltd. , https://www.longyiterminals.com
I. Analysis and solution of the problem of easy open circuit damage of active current transformer and voltage transformer 1. Reason analysis:
The active current transformer and voltage transformer also bring about the following problems in the production process while reducing the size:
a. The enameled wire adopts a finer specification (generally 0.08mm). After welding, the thin enameled wire has low tensile strength and is easy to break.
b. The requirements for the surround machine are improved. Because the core is small, the surrounding machine can't be processed, and special equipment is needed. Some manufacturers use the manual winding method. Due to hand sweat, intermediate joints, etc., it is easy to cause accidents.
c. The virtual solder joint is more difficult to test.
2. Prevention and Solution a. Choose a US or German surround machine that is not produced by manual winding.
b. Adopt a reliable welding method, that is, to ensure that the virtual solder joint is not present, and that the tensile strength of the enameled wire after welding is not reduced.
c. Eliminate unreliable products by special heat aging methods.
Through the implementation of our company's above prevention and solutions. Our company has realized the quality current transformer and voltage transformer for three years without quality accidents.
Second, the active current transformer, voltage transformer directly connected to the resistance sampling when the accuracy level of the reasons and solutions.
1. Analysis of the causes The active current transformer and voltage transformer are small in size, the core cross-sectional area is small, the output capability is low, the accuracy level of the direct connection resistance sampling will be significantly reduced, and the maximum output voltage is also low.
2. Solution When the active current transformer and voltage transformer are directly connected to the resistance sampling, the sampling resistor should be selected as small resistance resistor, which is generally not more than 400Ω.
Accuracy difference when connecting different resistance resistors (see attached table)
Third, the analysis and prevention of the problem of heat damage during the operation of the passive voltage transformer.
1. Analysis of the causes of the passive voltage transformer in the winding process, the number of pinholes in the enameled wire will increase, causing a short circuit between the turns of the coil or a short circuit between the turns. When the passive voltage transformer works, the coil will be generated. Magnetic vibration, causing a short circuit between turns. When the passive voltage transformer has a turn-to-turn short circuit phenomenon, the primary side operating current will increase sharply, and the voltage transformer will rapidly heat up and burn out the voltage transformer.
2. Prevention and Solution a. In the production process of passive voltage transformer, the voltage transformer wire coil dipping paint can fully weaken the magnetic vibration of the coil, which greatly reduces the probability of short circuit between turns.
b. The key to electrothermal aging by passive voltage transformer is that it can effectively eliminate the passive voltage transformer.
Fourth, improve the protection current transformer resistance to DC component capability solution Due to the presence of the fault current DC component, the protection current transformer will quickly saturate, and the sample value will be rapidly reduced, causing the protection device to malfunction.
Due to the saturation magnetic induction and remanence factors of most magnetic materials, the smaller DC component will saturate the transformer.
Selecting a magnetic material with high saturation magnetic induction and low remanence is the key to improving the DC resistance of the protection current transformer.
Although the silicon steel core has a high saturation magnetic induction strength, its residual magnetization is high, so the protection current transformer made by it is not ideal.
By increasing the cross-sectional area of ​​silicon steel, the DC resistance can be improved, but the increase is not much, and it is limited by the volume factor.
Silicon steel open air gap can greatly improve the DC resistance, but the protection current transformer made by it has a large phase difference (generally above 10°), and the phase difference changes with temperature.