As a circuit protection equipment tool that plays a key role in safety and security, circuit breakers similar to those mentioned above are often used in various industries. It can be cut off in time when the circuit is overloaded to prevent further losses and Dangerous, but the circuit breakers we often know are often limited to the classification of their models or applications. There are not many tools that should be matched during the use of circuit breakers. Today we are explaining the circuit breaker release. It can be used in conjunction with the circuit breaker community. It has the protection function of programs such as overload leakage, and can also play a certain monitoring and measuring effect. You can refer to the following for understanding.
First, the difference between the tripping and tripping of the circuit breaker
At any time during the closing process of the circuit breaker, if the protection action turns on the trip circuit, the circuit breaker can be reliably disconnected, which is called free tripping. The circuit breaker with free tripping can ensure that the circuit breaker can be disconnected quickly when it is short-circuited, so as to avoid expanding the scope of the accident. If it trips, it means that the line is faulty, or the circuit is overloaded, and the circuit breaker is disconnected. This is tripping.
Second, what is the meaning of the B, C, and D types of the circuit breaker according to the tripping method?
The circuit breakers are divided into B, C, and D types according to the tripping method, which means the circuit breaker trip characteristic curve (current-trip time).
The B characteristics apply to purely resistive loads and low-inductance lighting circuits.
The C characteristic is suitable for inductive loads and high-inductance lighting circuits.
The D characteristic is suitable for power distribution systems with high load and large inrush current.
Third, the circuit breaker release advantages and disadvantages
The disadvantage of the thermomagnetic trip unit is that it can only provide two-stage protection; the error of the action value is relatively large and cannot be adjusted (the so-called new generation circuit breaker can be mechanically adjusted, but the adjustment range is small and the error is quite large); Greater impact. The advantages are low cost, stable performance, relatively high reliability, no influence from voltage fluctuations, long life, and some models can be inverted. And can provide three sections or even four sections of protection, high sensitivity, accurate action value, and can be adjusted; after installing the communication module, it can also be connected with the host computer for remote control; basically not affected by the ambient temperature.
EPON (Ethernet Passive Optical Network), as the name suggests, is a PON technology based on Ethernet. It adopts point-to-multipoint structure, passive optical fiber transmission, and provides multiple services on Ethernet. EPON technology is standardized by the IEEE802.3 EFM working group. In June 2004, the IEEE802.3EFM working group released the EPON standard-IEEE802.3ah (incorporated into the IEEE802.3-2005 standard in 2005). In this standard, the Ethernet and PON technologies are combined, the PON technology is used in the physical layer, the Ethernet protocol is used in the data link layer, and the PON topology is used to realize Ethernet access. Therefore, it combines the advantages of PON technology and Ethernet technology: low cost, high bandwidth, strong scalability, compatibility with existing Ethernet, and convenient management.
ONU (Optical Network Unit) optical network unit, ONU is divided into active optical network unit and passive optical network unit. Generally, devices equipped with network monitoring including optical receivers, upstream optical transmitters, and multiple bridge amplifiers are called optical nodes. The PON uses a single optical fiber to connect to the OLT, and then the OLT connects to the ONU. ONU provides services such as data, IPTV (i.e. interactive network television), and voice (using IAD, i.e. Integrated Access Device), truly realizing "triple-play" applications.
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