Fundamentals of medium voltage switchgear
Aug 25, 2020
Medium-voltage switchgear is a common tool-type power equipment. We can see it in power equipment on many occasions. The medium-voltage switchgear plays a role of real-time control of high-voltage power with low-voltage power, so as to protect and monitor the higher voltage side. So what kind of principle is used to control the voltage of the medium voltage switchgear?
Summary of Types of Medium Voltage Switchgear
Incoming and outgoing switchgear, PT switchgear, and busbar line connection switchgear all belong to several main types of medium voltage switchgear. In practical applications, these switchgears have different functions. They work together to give the medium voltage switchgear a relatively integrated structure, which has a profound impact on its characteristics and scope of application.
Basic principles of medium voltage switchgear
The basic principle of the medium voltage switchgear is not complicated. In order for the medium voltage switchgear to operate efficiently for a long time in daily life and production, it needs to ensure the normal supply of secondary DC and AC power. The current transformer inside the medium voltage switchgear usually has two to three sets of coils. Among the two to three sets of coils, one set plays the role of measurement data. For example, connect a multimeter to that set of coils. In addition, There is a set of coils that play a protective role in the internal circuit of the entire medium voltage switchgear. For example, for some abb protection units, if there is a third set of coils, then it must only appear in the 100 incoming cabinet to provide differential protection The role of. If the incoming and outgoing wires and the grounding wire pass through a zero-sequence current transformer, pay attention to checking the three-phase unbalanced current. Among them, different power supplies provide support for different working components. The AC and DC are used and divided according to the specific situation. Medium voltage These are the basic principles of the switch.
Related matters
Operators of medium voltage switchgear should be careful not to cause it to be unable to perform normal work due to operating errors. In actual operation, common operating errors include the movement of grounding switches and circuit breakers. Many operators do not know that they are at the opening. Need to use a handcart to move. In addition, when you need to close, make sure that the circuit breaker is in the experimental position and in the engaged state. When moving the circuit breaker, pay attention to the state of the aviation head, which should be in a fastened state.
Although medium voltage switchgear is widely used, we are still studying the automation of medium voltage switchgear. I believe that in the near future, people will no longer need to pay attention to many things because they need to manually operate the medium voltage switchgear. The medium voltage switchgear will make people more worry-free in the use of electrical equipment.
