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Oxygen-free Elevator On-off

Oxygen-free Elevator On-off

Oxygen-free Elevator On-off For different applications, the purpose of applying varistor is that the voltage/current stress acting on the varistor is not the same, so the requirements for varistor are different. Pay attention to distinguishing this difference, which is very important for correct...

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Oxygen-free Elevator On-off



For different applications, the purpose of applying varistor is that the voltage/current stress acting on the varistor is not the same, so the requirements for varistor are different. Pay attention to distinguishing this difference, which is very important for correct use. of. Depending on the purpose of use, varistor can be divided into two categories: varistor for protection and varistor for circuit function.

Protective varistor
1. Differentiate between power protection, signal lines, and varistor for data line protection. They must meet the requirements of different technical standards.
2. According to the continuous working voltage applied to the varistor, the varistor across the power line can be divided into two types: AC or DC. The varistor is aged under these two voltage stresses. The characteristics are different.
3. According to the abnormal overvoltage characteristics of the varistor, the varistor can be divided into three types: surge suppression type, high power type and high energy type.
Surge suppression type: refers to a varistor used to suppress transient overvoltages such as lightning overvoltage and operating overvoltage. The occurrence of transient overvoltage is random, non-periodic, and the peak value of current and voltage may be very high. Big. Most varistors fall into this category.
High-power type: refers to the varistor used to absorb the continuous pulse group appearing in the cycle, for example, the varistor connected to the switching power converter, where the impulse voltage cycle occurs, and the period is known, the energy value can generally be calculated. When it comes out, the peak value of the voltage is not large, but because of the high frequency, the average power is quite large.
High-energy type: refers to a varistor that absorbs magnetic energy in a large inductive coil such as a generator excitation coil and a lifting electromagnet coil. For such applications, the main technical indicator is energy absorption capability.
The protection function of the varistor can be repeated many times in most applications, but it is sometimes made into a one-time protection device like a current fuse. For example, a short-circuit contact varistor connected in parallel to some current transformer load.


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