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Low voltage distribution system
Release time:2019-09-02 | Source:HUA LI JI DIAN.The low voltage distribution system consists of a power distribution substation (usually a power transmission voltage to a power distribution voltage), a high voltage distribution line (i.e. a voltage of more than 1 kV), a distribution transformer, a low voltage distribution line (below 1 kV) and the corresponding control protection equipment.
Composition
Low voltage circuit breaker: low voltage circuit breaker is also known as automatic switch, it is a manual switching effect, but also automatically for loss of voltage, undervoltage, overload, and short-circuit protection of electrical appliances. It can be used to distribute electrical energy, not frequently start asynchronous motors, power lines and electric motors to protect, when they have a serious overload or short circuit and undervoltage and other failures can automatically cut off the circuit, its function is equivalent to fuse switch and over-heat relay combination. And after breaking the fault current generally do not need to change the components, one has been widely used.
1、Circuit Breaker Accessories
2、Micro Circuit Breaker: Micro Circuit Breaker, referred to as MCB, is one of the most widely used terminal protection appliances in the power distribution device of the building electrical terminal.
3、Plastic shell circuit breaker: The plastic shell circuit breaker can automatically cut off the current after the current exceeds the jump setting. A plastic shell is a plastic insulator used as the shell of a device to isolate the metal parts between conductors and grounded. Plastic shell circuit breakers usually contain thermomagnetic jump-off units, while large-scale plastic case breakers are equipped with solid-state jumper sensors.
4、Frame breaker
5、Smart Universal Breaker
Smart Power Distribution :
1、Low-pressure reactive compensation kit
2、Composite switch3、Operation credit4、Reactive compensation controller
Low voltage power distribution switch
Load switch: load switch, as the name implies is the switch that can cut off the load current, to distinguish from the high-voltage circuit breaker, the load switch has no arcing ability, can not open the fault current, can only open the load current under the normal operation of the system, the load switch is named.
Isolation switch: isolation switch is the most used in high-voltage switch electrical appliances, its own principle and structure is relatively simple, but because of the large amount of use, high work reliability requirements, the power station, power plant design, establishment and safe operation of the impact is greater. The main feature of the knife gate is the ability to no arc, only in the absence of load current, the combined circuit measures.
Location, meaning
1、I means all live partial insulation. T means that the neutral point is directly grounded.2、T indicates that the device housing is directly grounded and is not directly related to any other ground location in the system;3、C means that the work zero line is in one with the protection line, and S indicates that the work zero line is strictly separate from the protection line.
The secondary power distribution system is composed of relay protection, safety automatic control, system communication, scheduling automation, DCS automatic control system, etc. The secondary system is an indispensable part of the power system, it is to realize the contact monitoring and control of the person and the system, so that the system can run safely and economically.
Relevant information