1st, Kwh meter , TA1~TA3 current transformer measurement alone, A ammeter , TA4~TA6 current transformer measurement alone.
The 2nd, Kwh meter, TA1~TA3 current transformer separate measurement, three-phase signal lamp power indication.
2nd, three-phase current measurement, TA1~TA3 current transformer separate measurement. Three-phase voltage indication, three-phase voltage measurement.
Circle + horizontal bar is the current transformer. 3 transformers + 1 meter, the transformer alone to the meter to provide current signals, which is called separate measurement. The current transformer alone provides a signal to the ammeter to measure the current, which is called separate measurement.PA is the ammeter, SA is the transfer switch, PV is the voltmeter. In the third figure, SA1 is the voltage transfer switch. The other is a current transfer switch.
Structure
Automation technology can be applied to electrical systems to form an automated electrical control system. The automated electrical control system can include three levels:the first is the isolation level, the second is the communication level, and the third is the control level. In terms of the first level, it is necessary to place cables and so on in the partition room to realize signal control and line measurement.
The second level involves installing various communication devices and facilitating the connection between the substation and the main station, and realizing data **** sharing between the devices. As far as the third level is concerned, it is necessary to form a network control system and manage each subsystem individually.