The circuit breaker plays a relatively important role in the entire power system. Its function is to realize the functions of controlling and protecting the equipment, mainly in the connection between its control loop and protection, automatic devices and the like.
1. Circuit breaker auxiliary contact conversion abnormal phenomenon
When the operation breaker is closed, if the green light flashes red or the traffic light is off, it indicates that the auxiliary contact of the circuit breaker is abnormally changed, or when the operation is opened, the red light flashes, the green light does not light or the traffic light is on. When it is extinguished, it also indicates an abnormal phenomenon.
2. Circuit breaker auxiliary contact conversion exception handling
When an abnormality occurs in the auxiliary contact switching of the circuit breaker, the first thing to do is to report the dispatch in time, view the signal of the background monitoring system, focus on the displacement of the circuit breaker, whether the current and the active power are normal, and if necessary, check with the dispatch monitoring center. Then, go to the site to check the secondary circuit and mechanism of the circuit breaker. When troubleshooting, it is indeed a problem of the auxiliary node of the circuit breaker. In order to avoid the abnormal separation of the switch, necessary measures must be taken. And timely report to the maintenance team, to be processed after the power outage.
3. Circuit breaker abnormal handling precautions
When the circuit breaker is running, the control circuit disconnection signal is issued. There are many reasons for this phenomenon. It must be analyzed according to the information related to the background machine and the situation of the on-site inspection equipment. Is the power supply circuit normal and the secondary circuit of the protection device is Normal, whether the energy storage of the switch mechanism is normal, whether the gas pressure of the switch SF6 is abnormal or not. After the operation has taken the necessary control measures for the discovered problems, notify the relevant maintenance and maintenance personnel to further investigate and deal with them, and find ways to minimize the impact of equipment failure on other equipment in the grid.
Two - way trigger diode, also known as two - end ac device (DIAC), and two - way thyristor at the same time.Because of its simple structure and low price, it is often used to trigger the bidirectional thyristor, and can also constitute overvoltage protection circuits.Construction, symbol and equivalent circuit of a bidirectional trigger diode.
Also commonly used in the overvoltage protection, timing, shift equal circuit, Figure 2 is the overvoltage protection circuit composed of bidirectional trigger diode and bidirectional thyristor.When the transient voltage exceeds the DIAC and Ubo, the DIAC quickly conducts and triggers the bidirectional thyristor to also conduct, so that the following load is protected from overvoltage damage.
DIACS
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