With the development of low-voltage power distribution network, people are facing more and more serious challenges, especially the increasing demand for low-voltage power distribution network. In order to prevent abnormal power consumption, a practical technical measure is that the intelligent load limiting circuit breaker has the functions of self inspection, alarm, temperature control, memory, overload protection, leakage protection and temperature display.

Basic functions of intelligent load limiting circuit breaker terminal controller

It integrates the collection, recording, display, transmission and control of current, leakage and other parameters It mainly has the following functions:

(1) Load limiting function

1) When the load current I is between 1.05irx < I ≤ iGrl, it enters the load limiting action interval. At this time, the load limiting action time is TRX (TRX is continuously adjustable and factory set to 250s); Irl is adjustable in zone 16 (1.1 ~ 1.5) Irx

2) When the load current I enters the load limiting action interval TRX, the circuit breaker will give an audible prompt, but will not trip and power off

3) When the load current I enters the load limiting action interval for more than TRX, the circuit breaker trips and cuts off power

4) For the second manual reclosing, when the load current I enters the 0.5trx time of the load limiting action interval again (the factory setting TRX is 250s), the circuit breaker will give an audible prompt, but will not trip and power off; When the load current enters the load limiting action range for more than 0.5trx (the factory setting TRX is 250s), the circuit breaker will trip and power off

5) For the third manual reclosure, when the load current I enters the load limiting action section again for 0.25trx (factory set TRX is 250s), the circuit breaker will give an audible prompt, but will not trip and power off: when the load current enters the load limiting section for more than 0.25trx (factory set TRX is 250s), the circuit breaker will trip and power off

(2) It has two overcurrent protection modes of definite time limit and inverse time limit, and has the functions of residual current, load limiting current, long delay current, short delay current and short-circuit instantaneous current The parameters are set by special controller In addition, it also has the function of counting and memorizing the large load value and occurrence time of the set time interval (6h) (the data of reading days can be stored internally)

(3) It has alarm function, makes sound when exceeding the load limiting current and trips after reaching the set time, taking into account the power consumption supervision function and reliable power consumption protection function

(4) Simple and friendly operation interface and two-level operation password protection, giving consideration to on-site (user) and remote (supervision department) operation authority

(5) Special isolated power supply method, advanced chip and electronic technology ensure the EMC performance and reliability of the show

(6) It has a communication interface conforming to the smart grid access protocol, which can be independently networked and operated remotely, or operate as a basic unit of the smart grid