The basic principle of self switching action of Microcomputer
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2017-12-25 17:06:00
The basic principles to be followed are as follows:
(1) when the work on the bus voltage is lower than the test pressure setting value, and the duration is greater than the time constant value, since the switch device can start, prepared from the cast time of fixed value and relevant protection and reclosing time match the fixed value.
The voltage of the standby power supply should work and normal range, or the standby power supply should be in a normal state of preparation, so that the self-casting device can be started, otherwise it should be closed.
Must be equipped with a self - casting device after disconnecting the circuit breaker.
Working power supply disappears, regardless of whether the into line circuit breaker has been disconnected, the switch device in startup delay arrived, I always tripping the circuit breaker, confirm the circuit breaker in jump, can close standby power circuit breaker.
According to the above logic function, the power supply can be avoided to be disconnected elsewhere, and the power supply can be switched on or off after the action.
When removing the working power, the self - throwing device should not be used.
The device introduces the hand jump signal of the incoming circuit breaker as the blocking quantity, and once the signal is collected, the device can be used to release the power and realize the lock.
Avoid standby power supply for permanent fault.
When considering operation mode and protection, should be avoided for standby power supply when the move for permanent fault occurs, usually by introducing atresia or check switch position make preparation on electricity.
For example, main transformer low voltage side section switch for the vote, the jump of main transformer differential protection action of each side, generally indicates that main transformer failure of ontology, then atresia main transformer low voltage side section switch for the vote;
When the main change backup protection action, it may be that the low pressure side bus or its outgoing line has been malfunctioned, at this time, the low-pressure side section switch should be used for self-casting.
The self-casting device is allowed only once
The conventional standby power input device is used to ensure that only one action is made by the charging and discharging process of the internal capacitor.
For the sake of understanding, the microcomputer device still refers to the concept of discharge, but the microcomputer is equipped with the software to realize the charge and discharge of the self-casting by the logic of the software.
When the charging and discharge conditions are satisfied, after 10s charging time, the charging is completed.
Discharge when discharge condition is satisfied, have a blocking signal or withdraw from the backup.
