AC regulated power supply concept
The concept of AC regulated power supply is an electronic device that can provide a stable AC power supply for the load. Also known as AC voltage stabilizer. For parameters and quality indicators of AC regulated power supply, please refer to DC regulated power supply. Various electronic devices require a relatively stable AC power supply, especially when computer technology is applied to various fields, the direct power supply from the AC grid without any measures can no longer meet the needs.
AC regulated power supply concept
An electronic device that can provide a stable AC power supply to a load. Also known as communication. Remote control, telesignaling and telemetry related to [2].
Basic principle and composition of AC power supply
At present, in power plants, so-called primary load industrial and mining enterprises, and some substations, the continuous and reliable power consumption is the basic condition for the safe operation of the motor. Auxiliary contact directly (or via low-voltage, time-delay relay) starts the backup power supply input, this method has no phase frequency detection, the success rate of power switching is low or the switching time is long, and the motor reset current is too large and it is easy to exceed the allowable value range and be damaged by impact , especially in some occasions where high-power motors and high-voltage motors are used, because the voltage decays slowly after the motor is powered off, if the backup power is turned on without checking the synchronization conditions when the residual voltage is large, the starting/standby transformer and the motor will have It may be damaged by severe impact. If the residual voltage drops to a certain level (such as between 20[[%]]-40[[%]]Un), then put in the backup power supply. Due to the long power-off time, The speed of the electric motor drops greatly, and the self-starting of the motors in groups causes the busbar to continue to lose pressure seriously, and some auxiliary machines are bound to withdraw.
In order to solve the above problems, this device will automatically track and monitor the frequency, voltage and phase of the power supply at both ends of the switch for a long time during normal power consumption. At the same time, use an appropriate mathematical model (not only consider the current phase difference and frequency difference, but also consider the change rate of the future phase difference and frequency difference) combined with the preset time before the switch is to be closed, calculate the phase difference and frequency of the closing point in the future. The difference is compared with the preset allowable phase difference and frequency difference, and when the conditions are met, it will send out a closing and tripping pulse signal.
